#include "lib/mac/CocoaCommon.hpp"

#if BOO_HAS_METAL

#include "boo/IApplication.hpp"
#include "boo/IGraphicsContext.hpp"
#include "boo/graphicsdev/Metal.hpp"
#include "lib/graphicsdev/Common.hpp"

#include <unordered_map>
#include <unordered_set>
#include <vector>

#include <logvisor/logvisor.hpp>

#if !__has_feature(objc_arc)
#error ARC Required
#endif

#define MAX_UNIFORM_COUNT 8
#define MAX_TEXTURE_COUNT 8

static const char* GammaVS =
  "#include <metal_stdlib>\n"
  "using namespace metal;\n"
  "struct VertData\n"
  "{\n"
  "    float4 posIn [[ attribute(0) ]];\n"
  "    float4 uvIn [[ attribute(1) ]];\n"
  "};\n"
  "\n"
  "struct VertToFrag\n"
  "{\n"
  "    float4 pos [[ position ]];\n"
  "    float2 uv;\n"
  "};\n"
  "\n"
  "vertex VertToFrag vmain(VertData v [[ stage_in ]])\n"
  "{\n"
  "    VertToFrag vtf;\n"
  "    vtf.uv = v.uvIn.xy;\n"
  "    vtf.pos = v.posIn;\n"
  "    return vtf;\n"
  "}\n";

static const char* GammaFS =
  "#include <metal_stdlib>\n"
  "using namespace metal;\n"
  "struct VertToFrag\n"
  "{\n"
  "    float4 pos [[ position ]];\n"
  "    float2 uv;\n"
  "};\n"
  "\n"
  "fragment float4 fmain(VertToFrag vtf [[ stage_in ]],\n"
  "                      sampler clampSamp [[ sampler(3) ]],\n"
  "                      texture2d<float> screenTex [[ texture(0) ]],\n"
  "                      texture2d<float> gammaLUT [[ texture(1) ]])\n"
  "{\n"
  "    uint4 tex = uint4(saturate(screenTex.sample(clampSamp, vtf.uv)) * float4(65535.0));\n"
  "    float4 colorOut;\n"
  "    for (int i=0 ; i<3 ; ++i)\n"
  "        colorOut[i] = gammaLUT.read(uint2(tex[i] % 256, tex[i] / 256)).r;\n"
  "    return colorOut;\n"
  "}\n";

namespace boo {
static logvisor::Module Log("boo::Metal");
struct MetalCommandQueue;

class MetalDataFactoryImpl;

class MetalDataFactoryImpl : public MetalDataFactory, public GraphicsDataFactoryHead {
  friend struct MetalCommandQueue;

  friend class MetalDataFactory::Context;

  IGraphicsContext* m_parent;
  struct MetalContext* m_ctx;

  bool m_hasTessellation = false;

  float m_gamma = 1.f;
  ObjToken<IShaderPipeline> m_gammaShader;
  ObjToken<ITextureD> m_gammaLUT;
  ObjToken<IGraphicsBufferS> m_gammaVBO;
  ObjToken<IShaderDataBinding> m_gammaBinding;

  void SetupGammaResources();

public:

  MetalDataFactoryImpl(IGraphicsContext* parent, MetalContext* ctx)
    : m_parent(parent), m_ctx(ctx) {}

  ~MetalDataFactoryImpl() = default;

  Platform platform() const { return Platform::Metal; }

  const char* platformName() const { return "Metal"; }

  void commitTransaction(const std::function<bool(IGraphicsDataFactory::Context& ctx)>&__BooTraceArgs);

  ObjToken<IGraphicsBufferD> newPoolBuffer(BufferUse use, size_t stride, size_t count __BooTraceArgs);

  void setDisplayGamma(float gamma) {
    if (m_ctx->m_pixelFormat == MTLPixelFormatRGBA16Float)
      m_gamma = gamma * 2.2f;
    else
      m_gamma = gamma;
    if (m_gamma != 1.f)
      UpdateGammaLUT(m_gammaLUT.get(), m_gamma);
  }

  bool isTessellationSupported(uint32_t& maxPatchSize) {
    maxPatchSize = 32;
    return m_hasTessellation;
  }

  void waitUntilShadersReady() {}
  bool areShadersReady() { return true; }
};

#define MTL_STATIC MTLResourceCPUCacheModeWriteCombined|MTLResourceStorageModeManaged
#define MTL_DYNAMIC MTLResourceCPUCacheModeWriteCombined|MTLResourceStorageModeManaged

class MetalGraphicsBufferS : public GraphicsDataNode<IGraphicsBufferS> {
  friend class MetalDataFactory;

  friend struct MetalCommandQueue;

  MetalGraphicsBufferS(const ObjToken<BaseGraphicsData>& parent, BufferUse use, MetalContext* ctx,
                       const void* data, size_t stride, size_t count)
    : GraphicsDataNode<IGraphicsBufferS>(parent), m_stride(stride), m_count(count), m_sz(stride * count) {
    m_buf = [ctx->m_dev newBufferWithBytes:data length:m_sz options:MTL_STATIC];
  }

public:
  size_t m_stride;
  size_t m_count;
  size_t m_sz;
  id <MTLBuffer> m_buf;

  ~MetalGraphicsBufferS() = default;
};

template<class DataCls>
class MetalGraphicsBufferD : public GraphicsDataNode<IGraphicsBufferD, DataCls> {
  friend class MetalDataFactory;

  friend class MetalDataFactoryImpl;

  friend struct MetalCommandQueue;
  MetalCommandQueue* m_q;
  std::unique_ptr<uint8_t[]> m_cpuBuf;
  int m_validSlots = 0;

  MetalGraphicsBufferD(const ObjToken<DataCls>& parent, MetalCommandQueue* q, BufferUse use,
                       MetalContext* ctx, size_t stride, size_t count)
    : GraphicsDataNode<IGraphicsBufferD, DataCls>(parent), m_q(q), m_stride(stride),
      m_count(count), m_sz(stride * count) {
    m_cpuBuf.reset(new uint8_t[m_sz]);
    m_bufs[0] = [ctx->m_dev newBufferWithLength:m_sz options:MTL_DYNAMIC];
    m_bufs[1] = [ctx->m_dev newBufferWithLength:m_sz options:MTL_DYNAMIC];
  }

public:
  size_t m_stride;
  size_t m_count;
  size_t m_sz;
  id <MTLBuffer> m_bufs[2];

  MetalGraphicsBufferD() = default;

  void update(int b) {
    int slot = 1 << b;
    if ((slot & m_validSlots) == 0) {
      id <MTLBuffer> res = m_bufs[b];
      memcpy(res.contents, m_cpuBuf.get(), m_sz);
      [res didModifyRange:NSMakeRange(0, m_sz)];
      m_validSlots |= slot;
    }
  }

  void load(const void* data, size_t sz) {
    size_t bufSz = std::min(sz, m_sz);
    memcpy(m_cpuBuf.get(), data, bufSz);
    m_validSlots = 0;
  }

  void* map(size_t sz) {
    if (sz > m_sz)
      return nullptr;
    return m_cpuBuf.get();
  }

  void unmap() {
    m_validSlots = 0;
  }
};

class MetalTextureS : public GraphicsDataNode<ITextureS> {
  friend class MetalDataFactory;

  MetalTextureS(const ObjToken<BaseGraphicsData>& parent, MetalContext* ctx, size_t width, size_t height,
                size_t mips, TextureFormat fmt, const void* data, size_t sz)
    : GraphicsDataNode<ITextureS>(parent) {
    MTLPixelFormat pfmt = MTLPixelFormatRGBA8Unorm;
    NSUInteger ppitchNum = 4;
    NSUInteger ppitchDenom = 1;
    NSUInteger bytesPerRow = width * ppitchNum;
    switch (fmt) {
    case TextureFormat::I8:
      pfmt = MTLPixelFormatR8Unorm;
      ppitchNum = 1;
      bytesPerRow = width * ppitchNum;
      break;
    case TextureFormat::I16:
      pfmt = MTLPixelFormatR16Unorm;
      ppitchNum = 2;
      bytesPerRow = width * ppitchNum;
      break;
    case TextureFormat::DXT1:
      pfmt = MTLPixelFormatBC1_RGBA;
      ppitchNum = 1;
      ppitchDenom = 2;
      bytesPerRow = width * 8 / 4; // Metal wants this in blocks, not bytes
      break;
    case TextureFormat::DXT3:
      pfmt = MTLPixelFormatBC2_RGBA;
      ppitchNum = 1;
      ppitchDenom = 1;
      bytesPerRow = width * 16 / 4; // Metal wants this in blocks, not bytes
      break;
    case TextureFormat::DXT5:
      pfmt = MTLPixelFormatBC3_RGBA;
      ppitchNum = 1;
      ppitchDenom = 1;
      bytesPerRow = width * 16 / 4; // Metal wants this in blocks, not bytes
      break;
    case TextureFormat::BPTC:
      pfmt = MTLPixelFormatBC7_RGBAUnorm;
      ppitchNum = 1;
      ppitchDenom = 1;
      bytesPerRow = width * 16 / 4; // Metal wants this in blocks, not bytes
      break;
    default:
      break;
    }

    @autoreleasepool {
      MTLTextureDescriptor* desc =
        [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:pfmt
                                                           width:width height:height
                                                       mipmapped:(mips > 1) ? YES : NO];
      desc.usage = MTLTextureUsageShaderRead;
      desc.mipmapLevelCount = mips;
      m_tex = [ctx->m_dev newTextureWithDescriptor:desc];
      const uint8_t* dataIt = reinterpret_cast<const uint8_t*>(data);
      for (size_t i = 0; i < mips; ++i) {
        [m_tex replaceRegion:MTLRegionMake2D(0, 0, width, height)
                 mipmapLevel:i
                   withBytes:dataIt
                 bytesPerRow:bytesPerRow];
        dataIt += width * height * ppitchNum / ppitchDenom;
        if (width > 1) {
          width /= 2;
          bytesPerRow /= 2;
        }
        if (height > 1)
          height /= 2;
      }
    }
  }

public:
  id <MTLTexture> m_tex;

  ~MetalTextureS() = default;
};

class MetalTextureSA : public GraphicsDataNode<ITextureSA> {
  friend class MetalDataFactory;

  MetalTextureSA(const ObjToken<BaseGraphicsData>& parent, MetalContext* ctx, size_t width,
                 size_t height, size_t layers, size_t mips,
                 TextureFormat fmt, const void* data, size_t sz)
    : GraphicsDataNode<ITextureSA>(parent) {
    MTLPixelFormat pfmt = MTLPixelFormatRGBA8Unorm;
    NSUInteger ppitch = 4;
    switch (fmt) {
    case TextureFormat::I8:
      pfmt = MTLPixelFormatR8Unorm;
      ppitch = 1;
      break;
    case TextureFormat::I16:
      pfmt = MTLPixelFormatR16Unorm;
      ppitch = 2;
      break;
    default:
      break;
    }

    @autoreleasepool {
      MTLTextureDescriptor* desc =
        [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:pfmt
                                                           width:width height:height
                                                       mipmapped:(mips > 1) ? YES : NO];
      desc.textureType = MTLTextureType2DArray;
      desc.arrayLength = layers;
      desc.mipmapLevelCount = mips;
      desc.usage = MTLTextureUsageShaderRead;
      m_tex = [ctx->m_dev newTextureWithDescriptor:desc];
      const uint8_t* dataIt = reinterpret_cast<const uint8_t*>(data);
      for (size_t i = 0; i < mips; ++i) {
        for (size_t j = 0; j < layers; ++j) {
          [m_tex replaceRegion:MTLRegionMake2D(0, 0, width, height)
                   mipmapLevel:i
                         slice:j
                     withBytes:dataIt
                   bytesPerRow:width * ppitch
                 bytesPerImage:width * height * ppitch];
          dataIt += width * height * ppitch;
        }
        if (width > 1)
          width /= 2;
        if (height > 1)
          height /= 2;
      }
    }
  }

public:
  id <MTLTexture> m_tex;

  ~MetalTextureSA() = default;
};

class MetalTextureD : public GraphicsDataNode<ITextureD> {
  friend class MetalDataFactory;

  friend struct MetalCommandQueue;
  MetalCommandQueue* m_q;
  size_t m_width = 0;
  size_t m_height = 0;
  std::unique_ptr<uint8_t[]> m_cpuBuf;
  size_t m_cpuSz;
  size_t m_pxPitch;
  int m_validSlots = 0;

  MetalTextureD(const ObjToken<BaseGraphicsData>& parent, MetalCommandQueue* q, MetalContext* ctx,
                size_t width, size_t height, TextureFormat fmt)
    : GraphicsDataNode<ITextureD>(parent), m_q(q), m_width(width), m_height(height) {
    MTLPixelFormat format;
    switch (fmt) {
    case TextureFormat::RGBA8:
      format = MTLPixelFormatRGBA8Unorm;
      m_pxPitch = 4;
      break;
    case TextureFormat::I8:
      format = MTLPixelFormatR8Unorm;
      m_pxPitch = 1;
      break;
    case TextureFormat::I16:
      format = MTLPixelFormatR16Unorm;
      m_pxPitch = 2;
      break;
    default:
      Log.report(logvisor::Fatal, FMT_STRING("unsupported tex format"));
      return;
    }

    m_cpuSz = width * height * m_pxPitch;
    m_cpuBuf.reset(new uint8_t[m_cpuSz]);

    @autoreleasepool {
      MTLTextureDescriptor* desc =
        [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:format
                                                           width:width height:height
                                                       mipmapped:NO];
      desc.usage = MTLTextureUsageShaderRead;
      m_texs[0] = [ctx->m_dev newTextureWithDescriptor:desc];
      m_texs[1] = [ctx->m_dev newTextureWithDescriptor:desc];
    }
  }

public:
  id <MTLTexture> m_texs[2];

  ~MetalTextureD() = default;

  void update(int b) {
    int slot = 1 << b;
    if ((slot & m_validSlots) == 0) {
      id <MTLTexture> res = m_texs[b];
      [res replaceRegion:MTLRegionMake2D(0, 0, m_width, m_height)
             mipmapLevel:0 withBytes:m_cpuBuf.get() bytesPerRow:m_width * m_pxPitch];
      m_validSlots |= slot;
    }
  }

  void load(const void* data, size_t sz) {
    size_t bufSz = std::min(sz, m_cpuSz);
    memcpy(m_cpuBuf.get(), data, bufSz);
    m_validSlots = 0;
  }

  void* map(size_t sz) {
    if (sz > m_cpuSz)
      return nullptr;
    return m_cpuBuf.get();
  }

  void unmap() {
    m_validSlots = 0;
  }
};

#define MAX_BIND_TEXS 4

class MetalTextureR : public GraphicsDataNode<ITextureR> {
  friend class MetalDataFactory;

  friend struct MetalCommandQueue;
  size_t m_width = 0;
  size_t m_height = 0;
  size_t m_samples = 0;
  size_t m_colorBindCount;
  size_t m_depthBindCount;

  void Setup(MetalContext* ctx) {
    if (m_colorBindCount > MAX_BIND_TEXS)
      Log.report(logvisor::Fatal, FMT_STRING("too many color bindings for render texture"));
    if (m_depthBindCount > MAX_BIND_TEXS)
      Log.report(logvisor::Fatal, FMT_STRING("too many depth bindings for render texture"));

    @autoreleasepool {
      MTLTextureDescriptor* desc =
        [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:ctx->m_pixelFormat
                                                           width:m_width height:m_height
                                                       mipmapped:NO];
      desc.storageMode = MTLStorageModePrivate;

      if (m_samples > 1) {
        desc.textureType = MTLTextureType2DMultisample;
        desc.sampleCount = m_samples;
        desc.usage = MTLTextureUsageRenderTarget;
        m_colorTex = [ctx->m_dev newTextureWithDescriptor:desc];

        desc.pixelFormat = MTLPixelFormatDepth32Float;
        m_depthTex = [ctx->m_dev newTextureWithDescriptor:desc];
      } else {
        desc.textureType = MTLTextureType2D;
        desc.sampleCount = 1;
        desc.usage = MTLTextureUsageRenderTarget;
        m_colorTex = [ctx->m_dev newTextureWithDescriptor:desc];

        desc.pixelFormat = MTLPixelFormatDepth32Float;
        m_depthTex = [ctx->m_dev newTextureWithDescriptor:desc];
      }

      desc.textureType = MTLTextureType2D;
      desc.sampleCount = 1;
      desc.usage = MTLTextureUsageShaderRead;
      if (m_colorBindCount) {
        desc.pixelFormat = ctx->m_pixelFormat;
        for (int i = 0; i < m_colorBindCount; ++i) {
          m_colorBindTex[i] = [ctx->m_dev newTextureWithDescriptor:desc];
          if (m_samples > 1) {
            m_blitColor[i] = [MTLRenderPassDescriptor renderPassDescriptor];
            m_blitColor[i].colorAttachments[0].texture = m_colorTex;
            m_blitColor[i].colorAttachments[0].loadAction = MTLLoadActionLoad;
            m_blitColor[i].colorAttachments[0].storeAction = MTLStoreActionMultisampleResolve;
            m_blitColor[i].colorAttachments[0].resolveTexture = m_colorBindTex[i];
          }
        }
      }

      if (m_depthBindCount) {
        desc.pixelFormat = MTLPixelFormatDepth32Float;
        for (int i = 0; i < m_depthBindCount; ++i) {
          m_depthBindTex[i] = [ctx->m_dev newTextureWithDescriptor:desc];
          if (m_samples > 1) {
            m_blitDepth[i] = [MTLRenderPassDescriptor renderPassDescriptor];
            m_blitDepth[i].depthAttachment.texture = m_colorTex;
            m_blitDepth[i].depthAttachment.loadAction = MTLLoadActionLoad;
            m_blitDepth[i].depthAttachment.storeAction = MTLStoreActionMultisampleResolve;
            m_blitDepth[i].depthAttachment.resolveTexture = m_depthBindTex[i];
          }
        }
      }

      {
        m_passDesc = [MTLRenderPassDescriptor renderPassDescriptor];

        m_passDesc.colorAttachments[0].texture = m_colorTex;
        m_passDesc.colorAttachments[0].loadAction = MTLLoadActionLoad;
        m_passDesc.colorAttachments[0].storeAction = MTLStoreActionStore;

        m_passDesc.depthAttachment.texture = m_depthTex;
        m_passDesc.depthAttachment.loadAction = MTLLoadActionLoad;
        m_passDesc.depthAttachment.storeAction = MTLStoreActionStore;
        m_passDesc.depthAttachment.clearDepth = 0.f;
      }

      {
        m_clearDepthPassDesc = [MTLRenderPassDescriptor renderPassDescriptor];

        m_clearDepthPassDesc.colorAttachments[0].texture = m_colorTex;
        m_clearDepthPassDesc.colorAttachments[0].loadAction = MTLLoadActionLoad;
        m_clearDepthPassDesc.colorAttachments[0].storeAction = MTLStoreActionStore;

        m_clearDepthPassDesc.depthAttachment.texture = m_depthTex;
        m_clearDepthPassDesc.depthAttachment.loadAction = MTLLoadActionClear;
        m_clearDepthPassDesc.depthAttachment.storeAction = MTLStoreActionStore;
        m_clearDepthPassDesc.depthAttachment.clearDepth = 0.f;
      }

      {
        m_clearColorPassDesc = [MTLRenderPassDescriptor renderPassDescriptor];

        m_clearColorPassDesc.colorAttachments[0].texture = m_colorTex;
        m_clearColorPassDesc.colorAttachments[0].loadAction = MTLLoadActionClear;
        m_clearColorPassDesc.colorAttachments[0].storeAction = MTLStoreActionStore;
        m_clearDepthPassDesc.colorAttachments[0].clearColor = MTLClearColorMake(0.0, 0.0, 0.0, 0.0);

        m_clearColorPassDesc.depthAttachment.texture = m_depthTex;
        m_clearColorPassDesc.depthAttachment.loadAction = MTLLoadActionLoad;
        m_clearColorPassDesc.depthAttachment.storeAction = MTLStoreActionStore;
        m_clearColorPassDesc.depthAttachment.clearDepth = 0.f;
      }

      {
        m_clearBothPassDesc = [MTLRenderPassDescriptor renderPassDescriptor];

        m_clearBothPassDesc.colorAttachments[0].texture = m_colorTex;
        m_clearBothPassDesc.colorAttachments[0].loadAction = MTLLoadActionClear;
        m_clearBothPassDesc.colorAttachments[0].storeAction = MTLStoreActionStore;
        m_clearBothPassDesc.colorAttachments[0].clearColor = MTLClearColorMake(0.0, 0.0, 0.0, 0.0);

        m_clearBothPassDesc.depthAttachment.texture = m_depthTex;
        m_clearBothPassDesc.depthAttachment.loadAction = MTLLoadActionClear;
        m_clearBothPassDesc.depthAttachment.storeAction = MTLStoreActionStore;
        m_clearBothPassDesc.depthAttachment.clearDepth = 0.f;
      }
    }
  }

  MetalTextureR(const ObjToken<BaseGraphicsData>& parent, MetalContext* ctx, size_t width, size_t height,
                size_t samples, size_t colorBindCount, size_t depthBindCount)
    : GraphicsDataNode<ITextureR>(parent), m_width(width), m_height(height), m_samples(samples),
      m_colorBindCount(colorBindCount),
      m_depthBindCount(depthBindCount) {
    if (samples == 0) m_samples = 1;
    Setup(ctx);
  }

public:
  size_t samples() const { return m_samples; }

  id <MTLTexture> m_colorTex;
  id <MTLTexture> m_depthTex;
  id <MTLTexture> m_colorBindTex[MAX_BIND_TEXS] = {};
  id <MTLTexture> m_depthBindTex[MAX_BIND_TEXS] = {};
  MTLRenderPassDescriptor* m_passDesc;
  MTLRenderPassDescriptor* m_clearDepthPassDesc;
  MTLRenderPassDescriptor* m_clearColorPassDesc;
  MTLRenderPassDescriptor* m_clearBothPassDesc;
  MTLRenderPassDescriptor* m_blitColor[MAX_BIND_TEXS] = {};
  MTLRenderPassDescriptor* m_blitDepth[MAX_BIND_TEXS] = {};

  ~MetalTextureR() = default;

  void resize(MetalContext* ctx, size_t width, size_t height) {
    if (width < 1)
      width = 1;
    if (height < 1)
      height = 1;
    m_width = width;
    m_height = height;
    Setup(ctx);
  }
};

class MetalTextureCubeR : public GraphicsDataNode<ITextureCubeR> {
  friend class MetalDataFactory;

  friend struct MetalCommandQueue;
  size_t m_width = 0;
  size_t m_numMips = 0;

  void Setup(MetalContext* ctx) {
    @autoreleasepool {
      MTLTextureDescriptor* desc =
          [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:ctx->m_pixelFormat
                                                             width:m_width height:m_width
                                                         mipmapped:NO];
      desc.storageMode = MTLStorageModePrivate;
      desc.textureType = MTLTextureTypeCube;
      desc.sampleCount = 1;
      desc.mipmapLevelCount = m_numMips;
      desc.usage = MTLTextureUsageRenderTarget | MTLTextureUsageShaderRead;
      m_colorTex = [ctx->m_dev newTextureWithDescriptor:desc];

      desc.mipmapLevelCount = 1;
      desc.pixelFormat = MTLPixelFormatDepth32Float;
      desc.usage = MTLTextureUsageRenderTarget;
      m_depthTex = [ctx->m_dev newTextureWithDescriptor:desc];

      for (NSUInteger i = 0; i < 6; ++i) {
        m_passDesc[i] = [MTLRenderPassDescriptor renderPassDescriptor];

        m_passDesc[i].colorAttachments[0].texture = m_colorTex;
        m_passDesc[i].colorAttachments[0].slice = i;
        m_passDesc[i].colorAttachments[0].loadAction = MTLLoadActionLoad;
        m_passDesc[i].colorAttachments[0].storeAction = MTLStoreActionStore;

        m_passDesc[i].depthAttachment.texture = m_depthTex;
        m_passDesc[i].depthAttachment.slice = i;
        m_passDesc[i].depthAttachment.loadAction = MTLLoadActionLoad;
        m_passDesc[i].depthAttachment.storeAction = MTLStoreActionStore;
        m_passDesc[i].depthAttachment.clearDepth = 0.f;
      }

      for (NSUInteger i = 0; i < 6; ++i) {
        m_clearDepthPassDesc[i] = [MTLRenderPassDescriptor renderPassDescriptor];

        m_clearDepthPassDesc[i].colorAttachments[0].texture = m_colorTex;
        m_clearDepthPassDesc[i].colorAttachments[0].slice = i;
        m_clearDepthPassDesc[i].colorAttachments[0].loadAction = MTLLoadActionLoad;
        m_clearDepthPassDesc[i].colorAttachments[0].storeAction = MTLStoreActionStore;

        m_clearDepthPassDesc[i].depthAttachment.texture = m_depthTex;
        m_clearDepthPassDesc[i].depthAttachment.slice = i;
        m_clearDepthPassDesc[i].depthAttachment.loadAction = MTLLoadActionClear;
        m_clearDepthPassDesc[i].depthAttachment.storeAction = MTLStoreActionStore;
        m_clearDepthPassDesc[i].depthAttachment.clearDepth = 0.f;
      }

      for (NSUInteger i = 0; i < 6; ++i) {
        m_clearColorPassDesc[i] = [MTLRenderPassDescriptor renderPassDescriptor];

        m_clearColorPassDesc[i].colorAttachments[0].texture = m_colorTex;
        m_clearColorPassDesc[i].colorAttachments[0].slice = i;
        m_clearColorPassDesc[i].colorAttachments[0].loadAction = MTLLoadActionClear;
        m_clearColorPassDesc[i].colorAttachments[0].storeAction = MTLStoreActionStore;
        m_clearColorPassDesc[i].colorAttachments[0].clearColor = MTLClearColorMake(0.0, 0.0, 0.0, 0.0);

        m_clearColorPassDesc[i].depthAttachment.texture = m_depthTex;
        m_clearColorPassDesc[i].depthAttachment.slice = i;
        m_clearColorPassDesc[i].depthAttachment.loadAction = MTLLoadActionLoad;
        m_clearColorPassDesc[i].depthAttachment.storeAction = MTLStoreActionStore;
        m_clearColorPassDesc[i].depthAttachment.clearDepth = 0.f;
      }

      for (NSUInteger i = 0; i < 6; ++i) {
        m_clearBothPassDesc[i] = [MTLRenderPassDescriptor renderPassDescriptor];

        m_clearBothPassDesc[i].colorAttachments[0].texture = m_colorTex;
        m_clearBothPassDesc[i].colorAttachments[0].slice = i;
        m_clearBothPassDesc[i].colorAttachments[0].loadAction = MTLLoadActionClear;
        m_clearBothPassDesc[i].colorAttachments[0].storeAction = MTLStoreActionStore;
        m_clearBothPassDesc[i].colorAttachments[0].clearColor = MTLClearColorMake(0.0, 0.0, 0.0, 0.0);

        m_clearBothPassDesc[i].depthAttachment.texture = m_depthTex;
        m_clearBothPassDesc[i].depthAttachment.slice = i;
        m_clearBothPassDesc[i].depthAttachment.loadAction = MTLLoadActionClear;
        m_clearBothPassDesc[i].depthAttachment.storeAction = MTLStoreActionStore;
        m_clearBothPassDesc[i].depthAttachment.clearDepth = 0.f;
      }
    }
  }

  MetalTextureCubeR(const ObjToken<BaseGraphicsData>& parent, MetalContext* ctx, size_t width, size_t mips)
      : GraphicsDataNode<ITextureCubeR>(parent), m_width(width), m_numMips(mips) {
    Setup(ctx);
  }

public:
  id <MTLTexture> m_colorTex;
  id <MTLTexture> m_depthTex;
  MTLRenderPassDescriptor* m_passDesc[6];
  MTLRenderPassDescriptor* m_clearDepthPassDesc[6];
  MTLRenderPassDescriptor* m_clearColorPassDesc[6];
  MTLRenderPassDescriptor* m_clearBothPassDesc[6];

  ~MetalTextureCubeR() = default;

  void resize(MetalContext* ctx, size_t width, size_t mips) {
    if (width < 1)
      width = 1;
    m_width = width;
    m_numMips = mips;
    Setup(ctx);
  }
};

static const size_t SEMANTIC_SIZE_TABLE[] =
  {
    0,
    12,
    16,
    12,
    16,
    16,
    4,
    8,
    16,
    16,
    16
  };

static const MTLVertexFormat SEMANTIC_TYPE_TABLE[] =
  {
    MTLVertexFormatInvalid,
    MTLVertexFormatFloat3,
    MTLVertexFormatFloat4,
    MTLVertexFormatFloat3,
    MTLVertexFormatFloat4,
    MTLVertexFormatFloat4,
    MTLVertexFormatUChar4Normalized,
    MTLVertexFormatFloat2,
    MTLVertexFormatFloat4,
    MTLVertexFormatFloat4,
    MTLVertexFormatFloat4
  };

struct MetalVertexFormat {
  size_t m_elementCount;
  MTLVertexDescriptor* m_vdesc;
  size_t m_stride = 0;
  size_t m_instStride = 0;

  MetalVertexFormat(size_t elementCount, const VertexElementDescriptor* elements)
    : m_elementCount(elementCount) {
    for (size_t i = 0; i < elementCount; ++i) {
      const VertexElementDescriptor* elemin = &elements[i];
      int semantic = int(elemin->semantic & VertexSemantic::SemanticMask);
      if ((elemin->semantic & VertexSemantic::Instanced) != VertexSemantic::None)
        m_instStride += SEMANTIC_SIZE_TABLE[semantic];
      else
        m_stride += SEMANTIC_SIZE_TABLE[semantic];
    }

    m_vdesc = [MTLVertexDescriptor vertexDescriptor];
    MTLVertexBufferLayoutDescriptor* layoutDesc = m_vdesc.layouts[0];
    layoutDesc.stride = m_stride;
    layoutDesc.stepFunction = MTLVertexStepFunctionPerVertex;
    layoutDesc.stepRate = 1;

    layoutDesc = m_vdesc.layouts[1];
    layoutDesc.stride = m_instStride;
    layoutDesc.stepFunction = MTLVertexStepFunctionPerInstance;
    layoutDesc.stepRate = 1;

    size_t offset = 0;
    size_t instOffset = 0;
    for (size_t i = 0; i < elementCount; ++i) {
      const VertexElementDescriptor* elemin = &elements[i];
      MTLVertexAttributeDescriptor* attrDesc = m_vdesc.attributes[i];
      int semantic = int(elemin->semantic & VertexSemantic::SemanticMask);
      if ((elemin->semantic & VertexSemantic::Instanced) != VertexSemantic::None) {
        attrDesc.offset = instOffset;
        attrDesc.bufferIndex = 1;
        instOffset += SEMANTIC_SIZE_TABLE[semantic];
      } else {
        attrDesc.offset = offset;
        attrDesc.bufferIndex = 0;
        offset += SEMANTIC_SIZE_TABLE[semantic];
      }
      attrDesc.format = SEMANTIC_TYPE_TABLE[semantic];
    }
  }

  MTLStageInputOutputDescriptor* makeTessellationComputeLayout() const {
    MTLStageInputOutputDescriptor* ret = [MTLStageInputOutputDescriptor stageInputOutputDescriptor];

    MTLBufferLayoutDescriptor* layoutDesc = ret.layouts[0];
    layoutDesc.stride = m_stride;
    layoutDesc.stepFunction = MTLStepFunctionThreadPositionInGridX;
    layoutDesc.stepRate = 1;

    for (size_t i = 0; i < m_elementCount; ++i) {
      MTLVertexAttributeDescriptor* origAttrDesc = m_vdesc.attributes[i];
      MTLAttributeDescriptor* attrDesc = ret.attributes[i];
      attrDesc.format = MTLAttributeFormat(origAttrDesc.format);
      attrDesc.offset = origAttrDesc.offset;
      attrDesc.bufferIndex = origAttrDesc.bufferIndex;
    }

    return ret;
  }

  MTLVertexDescriptor* makeTessellationVertexLayout() const {
    MTLVertexDescriptor* ret = [MTLVertexDescriptor vertexDescriptor];

    MTLVertexBufferLayoutDescriptor* layoutDesc = ret.layouts[0];
    layoutDesc.stride = m_stride;
    layoutDesc.stepFunction = MTLVertexStepFunctionPerPatch;
    layoutDesc.stepRate = 1;

    for (size_t i = 0; i < m_elementCount; ++i) {
      MTLVertexAttributeDescriptor* origAttrDesc = m_vdesc.attributes[i];
      MTLVertexAttributeDescriptor* attrDesc = ret.attributes[i];
      attrDesc.format = origAttrDesc.format;
      attrDesc.offset = origAttrDesc.offset;
      attrDesc.bufferIndex = origAttrDesc.bufferIndex;
    }

    return ret;
  }
};

static const MTLBlendFactor BLEND_FACTOR_TABLE[] =
  {
    MTLBlendFactorZero,
    MTLBlendFactorOne,
    MTLBlendFactorSourceColor,
    MTLBlendFactorOneMinusSourceColor,
    MTLBlendFactorDestinationColor,
    MTLBlendFactorOneMinusDestinationColor,
    MTLBlendFactorSourceAlpha,
    MTLBlendFactorOneMinusSourceAlpha,
    MTLBlendFactorDestinationAlpha,
    MTLBlendFactorOneMinusDestinationAlpha,
#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 101200
    MTLBlendFactorSource1Color,
    MTLBlendFactorOneMinusSource1Color,
#else
  MTLBlendFactorSourceColor,
  MTLBlendFactorOneMinusSourceColor,
#endif
  };

static const MTLPrimitiveType PRIMITIVE_TABLE[] =
  {
    MTLPrimitiveTypeTriangle,
    MTLPrimitiveTypeTriangleStrip,
    MTLPrimitiveTypePoint /* Actually patches */
  };

#define COLOR_WRITE_MASK (MTLColorWriteMaskRed | MTLColorWriteMaskGreen | MTLColorWriteMaskBlue)

class MetalShaderStage : public GraphicsDataNode<IShaderStage> {
  friend class MetalDataFactory;

  id <MTLFunction> m_shader;

  MetalShaderStage(const boo::ObjToken<BaseGraphicsData>& parent, MetalContext* ctx,
                   const uint8_t* data, size_t size, PipelineStage stage)
    : GraphicsDataNode<IShaderStage>(parent) {
    NSError* err = nullptr;

    id <MTLLibrary> shaderLib;
    if (data[0] == 1) {
      dispatch_data_t d = dispatch_data_create(data + 1, size - 1, nullptr, nullptr);
      shaderLib = [ctx->m_dev newLibraryWithData:d error:&err];
    } else {
      MTLCompileOptions* compOpts = [MTLCompileOptions new];
      compOpts.languageVersion = MTLLanguageVersion1_2;
      shaderLib = [ctx->m_dev newLibraryWithSource:@((const char*) (data + 1))
                                           options:compOpts
                                             error:&err];
      if (!shaderLib) {
        fmt::print(FMT_STRING("{}\n"), data + 1);
      }
    }
    if (!shaderLib) {
      Log.report(logvisor::Fatal, FMT_STRING("error creating library: {}"), [[err localizedDescription] UTF8String]);
    }

    NSString* funcName;
    switch (stage) {
    case PipelineStage::Vertex:
    default:
      funcName = @"vmain";
      break;
    case PipelineStage::Fragment:
      funcName = @"fmain";
      break;
    case PipelineStage::Geometry:
      funcName = @"gmain";
      break;
    case PipelineStage::Control:
      funcName = @"cmain";
      break;
    case PipelineStage::Evaluation:
      funcName = @"emain";
      break;
    }
    m_shader = [shaderLib newFunctionWithName:funcName];
  }

public:
  id <MTLFunction> shader() const { return m_shader; }
};

class MetalShaderPipeline : public GraphicsDataNode<IShaderPipeline> {
protected:
  friend class MetalDataFactory;

  friend struct MetalCommandQueue;
  friend struct MetalShaderDataBinding;
  MTLCullMode m_cullMode = MTLCullModeNone;
  MTLPrimitiveType m_drawPrim;
  uint32_t m_patchSize;

  MetalShaderPipeline(const boo::ObjToken<BaseGraphicsData>& parent)
    : GraphicsDataNode<IShaderPipeline>(parent) {}

  virtual void setupExtraStages(MetalContext* ctx, MTLRenderPipelineDescriptor* desc,
                                ObjToken<IShaderStage> compute, const MetalVertexFormat& cVtxFmt) {}

  virtual void draw(MetalCommandQueue& q, size_t start, size_t count);

  virtual void drawIndexed(MetalCommandQueue& q, size_t start, size_t count);

  virtual void drawInstances(MetalCommandQueue& q, size_t start, size_t count, size_t instCount, size_t startInst);

  virtual void
  drawInstancesIndexed(MetalCommandQueue& q, size_t start, size_t count, size_t instCount, size_t startInst);

  void setup(MetalContext* ctx,
             NSUInteger targetSamples,
             ObjToken<IShaderStage> vertex,
             ObjToken<IShaderStage> fragment,
             ObjToken<IShaderStage> compute,
             const VertexFormatInfo& vtxFmt,
             const AdditionalPipelineInfo& info) {
    m_drawPrim = PRIMITIVE_TABLE[int(info.prim)];
    m_patchSize = info.patchSize;

    switch (info.culling) {
    case CullMode::None:
    default:
      m_cullMode = MTLCullModeNone;
      break;
    case CullMode::Backface:
      m_cullMode = MTLCullModeBack;
      break;
    case CullMode::Frontface:
      m_cullMode = MTLCullModeFront;
      break;
    }

    MTLRenderPipelineDescriptor* desc = [MTLRenderPipelineDescriptor new];
    desc.vertexFunction = vertex.cast<MetalShaderStage>()->shader();
    desc.fragmentFunction = fragment.cast<MetalShaderStage>()->shader();
    MetalVertexFormat cVtxFmt(vtxFmt.elementCount, vtxFmt.elements);
    desc.vertexDescriptor = cVtxFmt.m_vdesc;
    setupExtraStages(ctx, desc, compute, cVtxFmt);
    desc.sampleCount = targetSamples;
    desc.colorAttachments[0].pixelFormat = ctx->m_pixelFormat;
    desc.colorAttachments[0].writeMask = (info.colorWrite ? COLOR_WRITE_MASK : 0) |
                                         (info.alphaWrite ? MTLColorWriteMaskAlpha : 0);
    desc.colorAttachments[0].blendingEnabled = info.dstFac != BlendFactor::Zero;
    if (info.srcFac == BlendFactor::Subtract || info.dstFac == BlendFactor::Subtract) {
      desc.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
      desc.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOne;
      desc.colorAttachments[0].rgbBlendOperation = MTLBlendOperationReverseSubtract;
      if (info.overwriteAlpha) {
        desc.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorOne;
        desc.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorZero;
        desc.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd;
      } else {
        desc.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha;
        desc.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOne;
        desc.colorAttachments[0].alphaBlendOperation = MTLBlendOperationReverseSubtract;
      }
    } else {
      desc.colorAttachments[0].sourceRGBBlendFactor = BLEND_FACTOR_TABLE[int(info.srcFac)];
      desc.colorAttachments[0].destinationRGBBlendFactor = BLEND_FACTOR_TABLE[int(info.dstFac)];
      desc.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd;
      if (info.overwriteAlpha) {
        desc.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorOne;
        desc.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorZero;
      } else {
        desc.colorAttachments[0].sourceAlphaBlendFactor = BLEND_FACTOR_TABLE[int(info.srcFac)];
        desc.colorAttachments[0].destinationAlphaBlendFactor = BLEND_FACTOR_TABLE[int(info.dstFac)];
      }
      desc.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd;
    }
    desc.depthAttachmentPixelFormat = info.depthAttachment ? MTLPixelFormatDepth32Float : MTLPixelFormatInvalid;
    desc.inputPrimitiveTopology = MTLPrimitiveTopologyClassTriangle;
    NSError* err = nullptr;
    m_state = [ctx->m_dev newRenderPipelineStateWithDescriptor:desc error:&err];
    if (err) {
      Log.report(logvisor::Fatal, FMT_STRING("error making shader pipeline: {}"),
                 [[err localizedDescription] UTF8String]);
    }

    MTLDepthStencilDescriptor* dsDesc = [MTLDepthStencilDescriptor new];
    switch (info.depthTest) {
    case ZTest::None:
    default:
      dsDesc.depthCompareFunction = MTLCompareFunctionAlways;
      break;
    case ZTest::LEqual:
      dsDesc.depthCompareFunction = MTLCompareFunctionGreaterEqual;
      break;
    case ZTest::Greater:
      dsDesc.depthCompareFunction = MTLCompareFunctionLess;
      break;
    case ZTest::GEqual:
      dsDesc.depthCompareFunction = MTLCompareFunctionLessEqual;
      break;
    case ZTest::Equal:
      dsDesc.depthCompareFunction = MTLCompareFunctionEqual;
      break;
    }

    dsDesc.depthWriteEnabled = info.depthWrite;
    m_dsState = [ctx->m_dev newDepthStencilStateWithDescriptor:dsDesc];
  }

public:
  id <MTLRenderPipelineState> m_state;
  id <MTLDepthStencilState> m_dsState;

  ~MetalShaderPipeline() = default;

  MetalShaderPipeline& operator=(const MetalShaderPipeline&) = delete;

  MetalShaderPipeline(const MetalShaderPipeline&) = delete;

  void bind(id <MTLRenderCommandEncoder> enc) {
    [enc setRenderPipelineState:m_state];
    [enc setDepthStencilState:m_dsState];
    [enc setCullMode:m_cullMode];
  }

  bool isReady() const { return true; }
};

class MetalTessellationShaderPipeline : public MetalShaderPipeline {
  friend class MetalDataFactory;

  friend struct MetalCommandQueue;
  friend struct MetalShaderDataBinding;

  MetalTessellationShaderPipeline(const ObjToken<BaseGraphicsData>& parent)
    : MetalShaderPipeline(parent) {}

  void setupExtraStages(MetalContext* ctx, MTLRenderPipelineDescriptor* desc,
                        ObjToken<IShaderStage> compute, const MetalVertexFormat& cVtxFmt) {
    desc.maxTessellationFactor = 16;
    desc.tessellationFactorScaleEnabled = NO;
    desc.tessellationFactorFormat = MTLTessellationFactorFormatHalf;
    desc.tessellationControlPointIndexType = MTLTessellationControlPointIndexTypeNone;
    desc.tessellationFactorStepFunction = MTLTessellationFactorStepFunctionPerPatch;
    desc.tessellationOutputWindingOrder = MTLWindingClockwise;
    desc.tessellationPartitionMode = MTLTessellationPartitionModeInteger;
    desc.vertexDescriptor = cVtxFmt.makeTessellationVertexLayout();

    MTLComputePipelineDescriptor* compDesc = [MTLComputePipelineDescriptor new];
    compDesc.computeFunction = compute.cast<MetalShaderStage>()->shader();
    compDesc.stageInputDescriptor = cVtxFmt.makeTessellationComputeLayout();

    NSError* err = nullptr;
    m_computeState = [ctx->m_dev newComputePipelineStateWithDescriptor:compDesc options:MTLPipelineOptionNone
                                                            reflection:nil error:&err];
    if (err) {
      Log.report(logvisor::Fatal, FMT_STRING("error making compute pipeline: {}"),
                 [[err localizedDescription] UTF8String]);
    }
  }

  void draw(MetalCommandQueue& q, size_t start, size_t count);

  void drawIndexed(MetalCommandQueue& q, size_t start, size_t count);

  void drawInstances(MetalCommandQueue& q, size_t start, size_t count, size_t instCount, size_t startInst);

  void drawInstancesIndexed(MetalCommandQueue& q, size_t start, size_t count, size_t instCount, size_t startInst);

public:
  id <MTLComputePipelineState> m_computeState;

  ~MetalTessellationShaderPipeline() = default;

  bool isReady() const { return true; }
};

static id <MTLBuffer> GetBufferGPUResource(const ObjToken<IGraphicsBuffer>& buf, int idx) {
  if (buf->dynamic()) {
    const MetalGraphicsBufferD <BaseGraphicsData>* cbuf = buf.cast < MetalGraphicsBufferD < BaseGraphicsData >> ();
    return cbuf->m_bufs[idx];
  } else {
    const MetalGraphicsBufferS* cbuf = buf.cast<MetalGraphicsBufferS>();
    return cbuf->m_buf;
  }
}

static id <MTLTexture> GetTextureGPUResource(const ObjToken<ITexture>& tex, int idx, int bindIdx, bool depth) {
  switch (tex->type()) {
  case TextureType::Dynamic: {
    const MetalTextureD* ctex = tex.cast<MetalTextureD>();
    return ctex->m_texs[idx];
  }
  case TextureType::Static: {
    const MetalTextureS* ctex = tex.cast<MetalTextureS>();
    return ctex->m_tex;
  }
  case TextureType::StaticArray: {
    const MetalTextureSA* ctex = tex.cast<MetalTextureSA>();
    return ctex->m_tex;
  }
  case TextureType::Render: {
    const MetalTextureR* ctex = tex.cast<MetalTextureR>();
    return depth ? ctex->m_depthBindTex[bindIdx] : ctex->m_colorBindTex[bindIdx];
  }
  case TextureType::CubeRender: {
    const MetalTextureCubeR* ctex = tex.cast<MetalTextureCubeR>();
    return ctex->m_colorTex;
  }
  default:
    break;
  }
  return nullptr;
}

struct MetalShaderDataBinding : GraphicsDataNode<IShaderDataBinding> {
  ObjToken<IShaderPipeline> m_pipeline;
  ObjToken<IGraphicsBuffer> m_vbuf;
  ObjToken<IGraphicsBuffer> m_instVbo;
  ObjToken<IGraphicsBuffer> m_ibuf;
  std::vector<ObjToken<IGraphicsBuffer>> m_ubufs;
  std::vector<size_t> m_ubufOffs;
  std::vector<bool> m_fubufs;
  struct BoundTex {
    ObjToken<ITexture> tex;
    int idx;
    bool depth;
  };
  std::vector<BoundTex> m_texs;
  size_t m_baseVert;
  size_t m_baseInst;

  MetalShaderDataBinding(const ObjToken<BaseGraphicsData>& d,
                         MetalContext* ctx,
                         const ObjToken<IShaderPipeline>& pipeline,
                         const ObjToken<IGraphicsBuffer>& vbuf,
                         const ObjToken<IGraphicsBuffer>& instVbo,
                         const ObjToken<IGraphicsBuffer>& ibuf,
                         size_t ubufCount, const ObjToken<IGraphicsBuffer>* ubufs, const PipelineStage* ubufStages,
                         const size_t* ubufOffs, const size_t* ubufSizes,
                         size_t texCount, const ObjToken<ITexture>* texs,
                         const int* texBindIdxs, const bool* depthBind,
                         size_t baseVert, size_t baseInst)
    : GraphicsDataNode<IShaderDataBinding>(d),
      m_pipeline(pipeline),
      m_vbuf(vbuf),
      m_instVbo(instVbo),
      m_ibuf(ibuf),
      m_baseVert(baseVert),
      m_baseInst(baseInst) {
    if (ubufCount && ubufStages) {
      m_fubufs.reserve(ubufCount);
      for (size_t i = 0; i < ubufCount; ++i)
        m_fubufs.push_back(ubufStages[i] == PipelineStage::Fragment);
    }

    if (ubufCount && ubufOffs && ubufSizes) {
      m_ubufOffs.reserve(ubufCount);
      for (size_t i = 0; i < ubufCount; ++i) {
#ifndef NDEBUG
        if (ubufOffs[i] % 256) {
          Log.report(logvisor::Fatal, FMT_STRING("non-256-byte-aligned uniform-offset {} provided to newShaderDataBinding"),
                     i);
        }
#endif
        m_ubufOffs.push_back(ubufOffs[i]);
      }
    }
    m_ubufs.reserve(ubufCount);
    for (size_t i = 0; i < ubufCount; ++i) {
#ifndef NDEBUG
      if (!ubufs[i]) {
        Log.report(logvisor::Fatal, FMT_STRING("null uniform-buffer {} provided to newShaderDataBinding"), i);
      }
#endif
      m_ubufs.push_back(ubufs[i]);
    }
    m_texs.reserve(texCount);
    for (size_t i = 0; i < texCount; ++i) {
      m_texs.push_back({texs[i], texBindIdxs ? texBindIdxs[i] : 0, depthBind ? depthBind[i] : false});
    }
  }

  void bind(id <MTLRenderCommandEncoder> enc, int b) {
    m_pipeline.cast<MetalShaderPipeline>()->bind(enc);

    if (m_vbuf) {
      id <MTLBuffer> buf = GetBufferGPUResource(m_vbuf, b);
      [enc setVertexBuffer:buf offset:0 atIndex:0];
    }
    if (m_instVbo) {
      id <MTLBuffer> buf = GetBufferGPUResource(m_instVbo, b);
      [enc setVertexBuffer:buf offset:0 atIndex:1];
    }
    if (m_ubufOffs.size())
      for (size_t i = 0; i < m_ubufs.size(); ++i) {
        if (m_fubufs.size() && m_fubufs[i])
          [enc setFragmentBuffer:GetBufferGPUResource(m_ubufs[i], b) offset:m_ubufOffs[i] atIndex:i + 2];
        else
          [enc setVertexBuffer:GetBufferGPUResource(m_ubufs[i], b) offset:m_ubufOffs[i] atIndex:i + 2];
      }
    else
      for (size_t i = 0; i < m_ubufs.size(); ++i) {
        if (m_fubufs.size() && m_fubufs[i])
          [enc setFragmentBuffer:GetBufferGPUResource(m_ubufs[i], b) offset:0 atIndex:i + 2];
        else
          [enc setVertexBuffer:GetBufferGPUResource(m_ubufs[i], b) offset:0 atIndex:i + 2];
      }
    for (size_t i = 0; i < m_texs.size(); ++i)
      if (m_texs[i].tex) {
        [enc setFragmentTexture:GetTextureGPUResource(m_texs[i].tex, b, m_texs[i].idx, m_texs[i].depth) atIndex:i];
        [enc setVertexTexture:GetTextureGPUResource(m_texs[i].tex, b, m_texs[i].idx, m_texs[i].depth) atIndex:i];
      }
  }

  void bindCompute(id <MTLComputeCommandEncoder> enc, int b) {
    if (m_vbuf) {
      id <MTLBuffer> buf = GetBufferGPUResource(m_vbuf, b);
      [enc setBuffer:buf offset:0 atIndex:0];
    }
    if (m_instVbo) {
      id <MTLBuffer> buf = GetBufferGPUResource(m_instVbo, b);
      [enc setBuffer:buf offset:0 atIndex:1];
    }
  }
};

struct MetalCommandQueue : IGraphicsCommandQueue {
  Platform platform() const { return IGraphicsDataFactory::Platform::Metal; }

  const char* platformName() const { return "Metal"; }

  MetalContext* m_ctx;
  IWindow* m_parentWindow;
  IGraphicsContext* m_parent;
  id <MTLCommandBuffer> m_cmdBuf;
  id <MTLRenderCommandEncoder> m_enc;
  id <MTLSamplerState> m_samplers[5];
  bool m_running = true;

  int m_fillBuf = 0;
  int m_drawBuf = 0;

  MetalCommandQueue(MetalContext* ctx, IWindow* parentWindow, IGraphicsContext* parent)
    : m_ctx(ctx), m_parentWindow(parentWindow), m_parent(parent) {
    @autoreleasepool {
      m_cmdBuf = [ctx->m_q commandBuffer];

      MTLSamplerDescriptor* sampDesc = [MTLSamplerDescriptor new];
      sampDesc.rAddressMode = MTLSamplerAddressModeRepeat;
      sampDesc.sAddressMode = MTLSamplerAddressModeRepeat;
      sampDesc.tAddressMode = MTLSamplerAddressModeRepeat;
      sampDesc.minFilter = MTLSamplerMinMagFilterLinear;
      sampDesc.magFilter = MTLSamplerMinMagFilterLinear;
      sampDesc.mipFilter = MTLSamplerMipFilterLinear;
      sampDesc.maxAnisotropy = ctx->m_anisotropy;
      sampDesc.borderColor = MTLSamplerBorderColorOpaqueWhite;
      m_samplers[0] = [ctx->m_dev newSamplerStateWithDescriptor:sampDesc];

      sampDesc.rAddressMode = MTLSamplerAddressModeClampToBorderColor;
      sampDesc.sAddressMode = MTLSamplerAddressModeClampToBorderColor;
      sampDesc.tAddressMode = MTLSamplerAddressModeClampToBorderColor;
      m_samplers[1] = [ctx->m_dev newSamplerStateWithDescriptor:sampDesc];

      sampDesc.rAddressMode = MTLSamplerAddressModeClampToBorderColor;
      sampDesc.sAddressMode = MTLSamplerAddressModeClampToBorderColor;
      sampDesc.tAddressMode = MTLSamplerAddressModeClampToBorderColor;
      sampDesc.borderColor = MTLSamplerBorderColorOpaqueBlack;
      m_samplers[2] = [ctx->m_dev newSamplerStateWithDescriptor:sampDesc];

      sampDesc.rAddressMode = MTLSamplerAddressModeClampToEdge;
      sampDesc.sAddressMode = MTLSamplerAddressModeClampToEdge;
      sampDesc.tAddressMode = MTLSamplerAddressModeClampToEdge;
      m_samplers[3] = [ctx->m_dev newSamplerStateWithDescriptor:sampDesc];

      sampDesc.rAddressMode = MTLSamplerAddressModeClampToEdge;
      sampDesc.sAddressMode = MTLSamplerAddressModeClampToEdge;
      sampDesc.tAddressMode = MTLSamplerAddressModeClampToEdge;
      sampDesc.minFilter = MTLSamplerMinMagFilterNearest;
      sampDesc.magFilter = MTLSamplerMinMagFilterNearest;
      m_samplers[4] = [ctx->m_dev newSamplerStateWithDescriptor:sampDesc];
    }
  }

  void startRenderer() {
    static_cast<MetalDataFactoryImpl*>(m_parent->getDataFactory())->SetupGammaResources();
  }

  void stopRenderer() {
    m_running = false;
    if (m_inProgress && m_cmdBuf.status != MTLCommandBufferStatusNotEnqueued)
      [m_cmdBuf waitUntilCompleted];
  }

  ~MetalCommandQueue() {
    if (m_running) stopRenderer();
  }

  MetalShaderDataBinding* m_boundData = nullptr;

  void _setShaderDataBinding(MetalShaderDataBinding* cbind) {
    cbind->bind(m_enc, m_fillBuf);
    m_boundData = cbind;
    [m_enc setFragmentSamplerStates:m_samplers withRange:NSMakeRange(0, 5)];
    [m_enc setVertexSamplerStates:m_samplers withRange:NSMakeRange(0, 5)];
  }

  void setShaderDataBinding(const ObjToken<IShaderDataBinding>& binding) {
    @autoreleasepool {
      MetalShaderDataBinding* cbind = binding.cast<MetalShaderDataBinding>();
      _setShaderDataBinding(cbind);
    }
  }

  ObjToken<ITexture> m_boundTarget;

  void _setRenderTarget(const ObjToken<ITextureR>& target, bool clearColor, bool clearDepth) {
    @autoreleasepool {
      MetalTextureR* ctarget = target.cast<MetalTextureR>();
      [m_enc endEncoding];
      if (clearColor && clearDepth)
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_clearBothPassDesc];
      else if (clearColor)
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_clearColorPassDesc];
      else if (clearDepth)
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_clearDepthPassDesc];
      else
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_passDesc];
      [m_enc setFrontFacingWinding:MTLWindingCounterClockwise];
      if (ctarget == m_boundTarget.get()) {
        if (m_boundVp.width || m_boundVp.height)
          [m_enc setViewport:m_boundVp];
        if (m_boundScissor.width || m_boundScissor.height)
          [m_enc setScissorRect:m_boundScissor];
      } else
        m_boundTarget = target.get();
    }
  }

  void setRenderTarget(const ObjToken<ITextureR>& target) {
    _setRenderTarget(target, false, false);
  }

  static constexpr int CubeFaceRemap[] = {0, 1, 3, 2, 4, 5};
  int m_boundFace = 0;
  void _setRenderTarget(const ObjToken<ITextureCubeR>& target, int face, bool clearColor, bool clearDepth) {
    m_boundFace = face;
    @autoreleasepool {
      face = CubeFaceRemap[face];
      MetalTextureCubeR* ctarget = target.cast<MetalTextureCubeR>();
      [m_enc endEncoding];
      if (clearColor && clearDepth)
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_clearBothPassDesc[face]];
      else if (clearColor)
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_clearColorPassDesc[face]];
      else if (clearDepth)
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_clearDepthPassDesc[face]];
      else
        m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:ctarget->m_passDesc[face]];
      [m_enc setFrontFacingWinding:MTLWindingCounterClockwise];
      if (ctarget == m_boundTarget.get()) {
        if (m_boundVp.width || m_boundVp.height)
          [m_enc setViewport:m_boundVp];
        if (m_boundScissor.width || m_boundScissor.height)
          [m_enc setScissorRect:m_boundScissor];
      } else
        m_boundTarget = target.get();
    }
  }

  void setRenderTarget(const ObjToken<ITextureCubeR>& target, int face) {
    _setRenderTarget(target, face, false, false);
  }

  MTLViewport m_boundVp = {};

  void setViewport(const SWindowRect& rect, float znear, float zfar) {
    m_boundVp = MTLViewport{double(rect.location[0]), double(rect.location[1]),
                            double(rect.size[0]), double(rect.size[1]), 1.f - zfar, 1.f - znear};
    [m_enc setViewport:m_boundVp];
  }

  MTLScissorRect m_boundScissor = {};

  void setScissor(const SWindowRect& rect) {
    if (m_boundTarget) {
      switch (m_boundTarget->type()) {
      case TextureType::Render: {
        MetalTextureR* ctarget = m_boundTarget.cast<MetalTextureR>();
        SWindowRect intersectRect = rect.intersect(SWindowRect(0, 0, ctarget->m_width, ctarget->m_height));
        m_boundScissor = MTLScissorRect{NSUInteger(intersectRect.location[0]),
            NSUInteger(ctarget->m_height - intersectRect.location[1] - intersectRect.size[1]),
            NSUInteger(intersectRect.size[0]), NSUInteger(intersectRect.size[1])};
        break;
      }
      case TextureType::CubeRender: {
        MetalTextureCubeR* ctarget = m_boundTarget.cast<MetalTextureCubeR>();
        SWindowRect intersectRect = rect.intersect(SWindowRect(0, 0, ctarget->m_width, ctarget->m_width));
        m_boundScissor = MTLScissorRect{NSUInteger(intersectRect.location[0]),
            NSUInteger(ctarget->m_width - intersectRect.location[1] - intersectRect.size[1]),
            NSUInteger(intersectRect.size[0]), NSUInteger(intersectRect.size[1])};
        break;
      }
      default: break;
      }
      [m_enc setScissorRect:m_boundScissor];
    }
  }

  std::unordered_map<MetalTextureR*, std::pair<size_t, size_t>> m_texResizes;

  void resizeRenderTexture(const ObjToken<ITextureR>& tex, size_t width, size_t height) {
    MetalTextureR* ctex = tex.cast<MetalTextureR>();
    m_texResizes[ctex] = std::make_pair(width, height);
  }

  std::unordered_map<MetalTextureCubeR*, std::pair<size_t, size_t>> m_texCubeResizes;

  void resizeRenderTexture(const ObjToken<ITextureCubeR>& tex, size_t width, size_t mips) {
    MetalTextureCubeR* ctex = tex.cast<MetalTextureCubeR>();
    m_texCubeResizes[ctex] = std::make_pair(width, mips);
  }

  void generateMipmaps(const ObjToken<ITextureCubeR>& tex) {
    @autoreleasepool {
      [m_enc endEncoding];
      m_enc = nil;
      m_boundTarget.reset();

      MetalTextureCubeR* ctex = tex.cast<MetalTextureCubeR>();
      id <MTLBlitCommandEncoder> blitEnc = [m_cmdBuf blitCommandEncoder];
      [blitEnc generateMipmapsForTexture:ctex->m_colorTex];
      [blitEnc endEncoding];
    }
  }

  void schedulePostFrameHandler(std::function<void(void)>&& func) {
    func();
  }

  void flushBufferUpdates() {}

  float m_clearColor[4] = {0.f, 0.f, 0.f, 0.f};

  void setClearColor(const float rgba[4]) {
    m_clearColor[0] = rgba[0];
    m_clearColor[1] = rgba[1];
    m_clearColor[2] = rgba[2];
    m_clearColor[3] = rgba[3];
  }

  void _autoSetRenderTarget(bool render, bool depth) {
    switch (m_boundTarget->type()) {
    case TextureType::Render:
      _setRenderTarget(m_boundTarget.cast<ITextureR>(), render, depth); break;
    case TextureType::CubeRender:
      _setRenderTarget(m_boundTarget.cast<ITextureCubeR>(), m_boundFace, render, depth); break;
    default: break;
    }
  }

  void clearTarget(bool render = true, bool depth = true) {
    if (!m_boundTarget)
      return;
    _autoSetRenderTarget(render, depth);
  }

  void draw(size_t start, size_t count) {
    m_boundData->m_pipeline.cast<MetalShaderPipeline>()->draw(*this, start, count);
  }

  void drawIndexed(size_t start, size_t count) {
    m_boundData->m_pipeline.cast<MetalShaderPipeline>()->drawIndexed(*this, start, count);
  }

  void drawInstances(size_t start, size_t count, size_t instCount, size_t startInst) {
    m_boundData->m_pipeline.cast<MetalShaderPipeline>()->drawInstances(*this, start, count, instCount, startInst);
  }

  void drawInstancesIndexed(size_t start, size_t count, size_t instCount, size_t startInst) {
    m_boundData->m_pipeline.cast<MetalShaderPipeline>()->drawInstancesIndexed(*this, start, count, instCount,
                                                                              startInst);
  }

  void _resolveBindTexture(MetalTextureR* tex, const SWindowRect& rect, bool tlOrigin,
                           int bindIdx, bool color, bool depth) {
    if (tex->samples() > 1) {
      if (color && tex->m_colorBindTex[bindIdx])
        [[m_cmdBuf renderCommandEncoderWithDescriptor:tex->m_blitColor[bindIdx]] endEncoding];
      if (depth && tex->m_depthBindTex[bindIdx])
        [[m_cmdBuf renderCommandEncoderWithDescriptor:tex->m_blitDepth[bindIdx]] endEncoding];
    } else {
      SWindowRect intersectRect = rect.intersect(SWindowRect(0, 0, tex->m_width, tex->m_height));
      NSUInteger y = tlOrigin ? intersectRect.location[1] : int(tex->m_height) -
                                                            intersectRect.location[1] - intersectRect.size[1];
      MTLOrigin origin = {NSUInteger(intersectRect.location[0]), y, 0};
      id <MTLBlitCommandEncoder> blitEnc = [m_cmdBuf blitCommandEncoder];

      if (color && tex->m_colorBindTex[bindIdx]) {
        [blitEnc copyFromTexture:tex->m_colorTex
                     sourceSlice:0
                     sourceLevel:0
                    sourceOrigin:origin
                      sourceSize:MTLSizeMake(intersectRect.size[0], intersectRect.size[1], 1)
                       toTexture:tex->m_colorBindTex[bindIdx]
                destinationSlice:0
                destinationLevel:0
               destinationOrigin:origin];
      }

      if (depth && tex->m_depthBindTex[bindIdx]) {
        [blitEnc copyFromTexture:tex->m_depthTex
                     sourceSlice:0
                     sourceLevel:0
                    sourceOrigin:origin
                      sourceSize:MTLSizeMake(intersectRect.size[0], intersectRect.size[1], 1)
                       toTexture:tex->m_depthBindTex[bindIdx]
                destinationSlice:0
                destinationLevel:0
               destinationOrigin:origin];
      }

      [blitEnc endEncoding];
    }
  }

  void resolveBindTexture(const ObjToken<ITextureR>& texture, const SWindowRect& rect, bool tlOrigin,
                          int bindIdx, bool color, bool depth, bool clearDepth) {
    MetalTextureR* tex = texture.cast<MetalTextureR>();
    @autoreleasepool {
      [m_enc endEncoding];

      _resolveBindTexture(tex, rect, tlOrigin, bindIdx, color, depth);

      m_enc = [m_cmdBuf renderCommandEncoderWithDescriptor:clearDepth ? tex->m_clearDepthPassDesc : tex->m_passDesc];
      [m_enc setFrontFacingWinding:MTLWindingCounterClockwise];

      if (m_boundData)
        _setShaderDataBinding(m_boundData);
      if (m_boundVp.width || m_boundVp.height)
        [m_enc setViewport:m_boundVp];
      if (m_boundScissor.width || m_boundScissor.height)
        [m_enc setScissorRect:m_boundScissor];
    }
  }

  ObjToken<ITextureR> m_needsDisplay;

  void resolveDisplay(const ObjToken<ITextureR>& source) {
    m_needsDisplay = source;
  }

  id <MTLBuffer> m_tessFactorBuffer = nullptr;

  id <MTLBuffer> ensureTessFactorBuffer(size_t patchCount) {
    size_t targetLength = sizeof(MTLQuadTessellationFactorsHalf) * patchCount;
    if (!m_tessFactorBuffer) {
      m_tessFactorBuffer = [m_ctx->m_dev newBufferWithLength:targetLength * 2 options:MTLResourceStorageModePrivate];
    } else if (m_tessFactorBuffer.length < targetLength) {
      targetLength *= 2;
      id <MTLBuffer> newBuf = [m_ctx->m_dev newBufferWithLength:targetLength options:MTLResourceStorageModePrivate];
      id <MTLBlitCommandEncoder> enc = [m_cmdBuf blitCommandEncoder];
      [enc copyFromBuffer:m_tessFactorBuffer sourceOffset:0 toBuffer:newBuf destinationOffset:0 size:m_tessFactorBuffer.length];
      [enc endEncoding];
      m_tessFactorBuffer = newBuf;
    }
    return m_tessFactorBuffer;
  }

  void dispatchTessKernel(id <MTLComputePipelineState> computeState, size_t patchStart,
                          size_t patchCount, uint32_t patchSize) {
    struct KernelPatchInfo {
      uint32_t numPatches; // total number of patches to process.
      // we need this because this value may
      // not be a multiple of threadgroup size.
      uint16_t numPatchesInThreadGroup; // number of patches processed by a
      // thread-group
      uint16_t numControlPointsPerPatch;
    } patchInfo = {uint32_t(patchCount), 32, uint16_t(patchSize)};

    [m_enc endEncoding];
    m_enc = nullptr;
    id <MTLBuffer> tessFactorBuf = ensureTessFactorBuffer(patchStart + patchCount);
    id <MTLComputeCommandEncoder> computeEnc = [m_cmdBuf computeCommandEncoder];
    [computeEnc setComputePipelineState:computeState];
    m_boundData->bindCompute(computeEnc, m_fillBuf);
    [computeEnc setStageInRegion:MTLRegionMake1D(patchStart, patchCount)];
    [computeEnc setBytes:&patchInfo length:sizeof(patchInfo) atIndex:2];
    [computeEnc setBuffer:tessFactorBuf
                   offset:patchStart * sizeof(MTLQuadTessellationFactorsHalf) atIndex:3];
    [computeEnc dispatchThreads:MTLSizeMake(patchCount, 1, 1) threadsPerThreadgroup:MTLSizeMake(32, 1, 1)];
    [computeEnc endEncoding];
    _autoSetRenderTarget(false, false);
    m_boundData->bind(m_enc, m_fillBuf);
    [m_enc setFragmentSamplerStates:m_samplers withRange:NSMakeRange(0, 5)];
    [m_enc setVertexSamplerStates:m_samplers withRange:NSMakeRange(0, 5)];
    [m_enc setTessellationFactorBuffer:m_tessFactorBuffer offset:0 instanceStride:0];
  }

  bool m_inProgress = false;
  std::unordered_map<uintptr_t, MTLRenderPassDescriptor*> m_resolvePasses;
  std::unordered_map<uintptr_t, MTLRenderPassDescriptor*> m_gammaPasses;

  void execute() {
    if (!m_running)
      return;

    @autoreleasepool {
      /* Update dynamic data here */
      MetalDataFactoryImpl* gfxF = static_cast<MetalDataFactoryImpl*>(m_parent->getDataFactory());
      std::unique_lock<std::recursive_mutex> datalk(gfxF->m_dataMutex);
      if (gfxF->m_dataHead) {
        for (BaseGraphicsData& d : *gfxF->m_dataHead) {
          if (d.m_DBufs)
            for (IGraphicsBufferD& b : *d.m_DBufs)
              static_cast<MetalGraphicsBufferD <BaseGraphicsData>&>(b).update(m_fillBuf);
          if (d.m_DTexs)
            for (ITextureD& t : *d.m_DTexs)
              static_cast<MetalTextureD&>(t).update(m_fillBuf);
        }
      }
      if (gfxF->m_poolHead) {
        for (BaseGraphicsPool& p : *gfxF->m_poolHead) {
          if (p.m_DBufs)
            for (IGraphicsBufferD& b : *p.m_DBufs)
              static_cast<MetalGraphicsBufferD <BaseGraphicsData>&>(b).update(m_fillBuf);
        }
      }
      datalk.unlock();

      [m_enc endEncoding];
      m_enc = nullptr;

      /* Abandon if in progress (renderer too slow) */
      if (m_inProgress) {
        m_cmdBuf = [m_ctx->m_q commandBuffer];
        return;
      }

      /* Perform texture resizes */
      if (m_texResizes.size() || m_texCubeResizes.size()) {
        for (const auto& resize : m_texResizes)
          resize.first->resize(m_ctx, resize.second.first, resize.second.second);
        m_texResizes.clear();
        for (const auto& resize : m_texCubeResizes)
          resize.first->resize(m_ctx, resize.second.first, resize.second.second);
        m_texCubeResizes.clear();
        m_cmdBuf = [m_ctx->m_q commandBuffer];
        return;
      }

      /* Wrap up and present if needed */
      if (m_needsDisplay) {
        MetalContext::Window& w = m_ctx->m_windows[m_parentWindow];
        {
          std::unique_lock<std::mutex> lk(w.m_resizeLock);
          if (w.m_needsResize) {
            w.m_metalLayer.drawableSize = w.m_size;
            w.m_needsResize = NO;
            m_needsDisplay.reset();
            return;
          }
        }
        id <CAMetalDrawable> drawable = [w.m_metalLayer nextDrawable];
        if (drawable) {
          MetalTextureR* src = m_needsDisplay.cast<MetalTextureR>();
          id <MTLTexture> dest = drawable.texture;
          if (src->m_colorTex.width == dest.width &&
              src->m_colorTex.height == dest.height) {
            if (gfxF->m_gamma != 1.f) {
              SWindowRect rect(0, 0, src->m_width, src->m_height);
              _resolveBindTexture(src, rect, true, 0, true, false);

              uintptr_t key = uintptr_t(dest);
              auto passSearch = m_gammaPasses.find(key);
              if (passSearch == m_gammaPasses.end()) {
                MTLRenderPassDescriptor* desc = [MTLRenderPassDescriptor renderPassDescriptor];
                desc.colorAttachments[0].texture = dest;
                desc.colorAttachments[0].loadAction = MTLLoadActionLoad;
                desc.colorAttachments[0].storeAction = MTLStoreActionStore;
                passSearch = m_gammaPasses.insert(std::make_pair(key, desc)).first;
              }

              id <MTLRenderCommandEncoder> enc = [m_cmdBuf renderCommandEncoderWithDescriptor:passSearch->second];
              MetalShaderDataBinding* gammaBinding = gfxF->m_gammaBinding.cast<MetalShaderDataBinding>();
              gammaBinding->m_texs[0].tex = m_needsDisplay.get();
              gammaBinding->bind(enc, m_drawBuf);
              [enc setFragmentSamplerStates:m_samplers withRange:NSMakeRange(0, 5)];
              [enc setVertexSamplerStates:m_samplers withRange:NSMakeRange(0, 5)];
              [enc drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4];
              gammaBinding->m_texs[0].tex.reset();
              [enc endEncoding];
            } else {
              if (src->samples() > 1) {
                uintptr_t key = uintptr_t(src->m_colorTex) ^uintptr_t(dest);
                auto passSearch = m_resolvePasses.find(key);
                if (passSearch == m_resolvePasses.end()) {
                  MTLRenderPassDescriptor* desc = [MTLRenderPassDescriptor renderPassDescriptor];
                  desc.colorAttachments[0].texture = src->m_colorTex;
                  desc.colorAttachments[0].loadAction = MTLLoadActionLoad;
                  desc.colorAttachments[0].storeAction = MTLStoreActionMultisampleResolve;
                  desc.colorAttachments[0].resolveTexture = dest;
                  passSearch = m_resolvePasses.insert(std::make_pair(key, desc)).first;
                }
                [[m_cmdBuf renderCommandEncoderWithDescriptor:passSearch->second] endEncoding];
              } else {
                id <MTLBlitCommandEncoder> blitEnc = [m_cmdBuf blitCommandEncoder];
                [blitEnc copyFromTexture:src->m_colorTex
                             sourceSlice:0
                             sourceLevel:0
                            sourceOrigin:MTLOriginMake(0, 0, 0)
                              sourceSize:MTLSizeMake(dest.width, dest.height, 1)
                               toTexture:dest
                        destinationSlice:0
                        destinationLevel:0
                       destinationOrigin:MTLOriginMake(0, 0, 0)];
                [blitEnc endEncoding];
              }
            }
            [m_cmdBuf presentDrawable:drawable];
          }
        }
        m_needsDisplay.reset();
      }

      m_drawBuf = m_fillBuf;
      m_fillBuf ^= 1;

      [m_cmdBuf addCompletedHandler:^(id <MTLCommandBuffer> buf) { m_inProgress = false; }];
      m_inProgress = true;
      [m_cmdBuf commit];
      m_cmdBuf = [m_ctx->m_q commandBuffer];
    }
  }

#ifdef BOO_GRAPHICS_DEBUG_GROUPS
  void pushDebugGroup(const char* name, const std::array<float, 4>& color) {
    @autoreleasepool {
      [m_cmdBuf pushDebugGroup:[NSString stringWithUTF8String:name]];
    }
  }

  void popDebugGroup() {
    @autoreleasepool {
      [m_cmdBuf popDebugGroup];
    }
  }
#endif
};

void MetalShaderPipeline::draw(MetalCommandQueue& q, size_t start, size_t count) {
  [q.m_enc drawPrimitives:m_drawPrim
              vertexStart:start + q.m_boundData->m_baseVert
              vertexCount:count];
}

void MetalShaderPipeline::drawIndexed(MetalCommandQueue& q, size_t start, size_t count) {
  [q.m_enc drawIndexedPrimitives:m_drawPrim
                      indexCount:count
                       indexType:MTLIndexTypeUInt32
                     indexBuffer:GetBufferGPUResource(q.m_boundData->m_ibuf, q.m_fillBuf)
               indexBufferOffset:start * 4
                   instanceCount:1
                      baseVertex:q.m_boundData->m_baseVert
                    baseInstance:0];
}

void MetalShaderPipeline::drawInstances(MetalCommandQueue& q, size_t start, size_t count, size_t instCount,
                                        size_t startInst) {
  [q.m_enc drawPrimitives:m_drawPrim
              vertexStart:start + q.m_boundData->m_baseVert
              vertexCount:count
            instanceCount:instCount
             baseInstance:startInst + q.m_boundData->m_baseInst];
}

void MetalShaderPipeline::drawInstancesIndexed(MetalCommandQueue& q, size_t start, size_t count, size_t instCount,
                                               size_t startInst) {
  [q.m_enc drawIndexedPrimitives:m_drawPrim
                      indexCount:count
                       indexType:MTLIndexTypeUInt32
                     indexBuffer:GetBufferGPUResource(q.m_boundData->m_ibuf, q.m_fillBuf)
               indexBufferOffset:start * 4
                   instanceCount:instCount
                      baseVertex:q.m_boundData->m_baseVert
                    baseInstance:startInst + q.m_boundData->m_baseInst];
}

void MetalTessellationShaderPipeline::draw(MetalCommandQueue& q, size_t start, size_t count) {
  q.dispatchTessKernel(m_computeState, start, count, m_patchSize);
  [q.m_enc drawPatches:m_patchSize
            patchStart:start
            patchCount:count
      patchIndexBuffer:nullptr
patchIndexBufferOffset:0
         instanceCount:1
          baseInstance:0];
}

void MetalTessellationShaderPipeline::drawIndexed(MetalCommandQueue& q, size_t start, size_t count) {
  q.dispatchTessKernel(m_computeState, start, count, m_patchSize);
  [q.m_enc drawIndexedPatches:m_patchSize
                   patchStart:0
                   patchCount:count
             patchIndexBuffer:nullptr
       patchIndexBufferOffset:0
      controlPointIndexBuffer:GetBufferGPUResource(q.m_boundData->m_ibuf, q.m_fillBuf)
controlPointIndexBufferOffset:start * 4
                instanceCount:1
                 baseInstance:0];
}

void MetalTessellationShaderPipeline::drawInstances(MetalCommandQueue& q, size_t start, size_t count, size_t instCount,
                                                    size_t startInst) {
  q.dispatchTessKernel(m_computeState, start, count, m_patchSize);
  [q.m_enc drawPatches:m_patchSize
            patchStart:start
            patchCount:count
      patchIndexBuffer:nullptr
patchIndexBufferOffset:0
         instanceCount:instCount
          baseInstance:startInst];
}

void MetalTessellationShaderPipeline::drawInstancesIndexed(MetalCommandQueue& q, size_t start, size_t count,
                                                           size_t instCount, size_t startInst) {
  q.dispatchTessKernel(m_computeState, start, count, m_patchSize);
  [q.m_enc drawIndexedPatches:m_patchSize
                   patchStart:0
                   patchCount:count
             patchIndexBuffer:nullptr
       patchIndexBufferOffset:0
      controlPointIndexBuffer:GetBufferGPUResource(q.m_boundData->m_ibuf, q.m_fillBuf)
controlPointIndexBufferOffset:start * 4
                instanceCount:instCount
                 baseInstance:startInst];
}

MetalDataFactory::Context::Context(MetalDataFactory& parent __BooTraceArgs)
  : m_parent(parent), m_data(new BaseGraphicsData(static_cast<MetalDataFactoryImpl&>(parent)__BooTraceArgsUse)) {}

MetalDataFactory::Context::~Context() {}

ObjToken<IGraphicsBufferS>
MetalDataFactory::Context::newStaticBuffer(BufferUse use, const void* data, size_t stride, size_t count) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    return {new MetalGraphicsBufferS(m_data, use, factory.m_ctx, data, stride, count)};
  }
}

ObjToken<IGraphicsBufferD>
MetalDataFactory::Context::newDynamicBuffer(BufferUse use, size_t stride, size_t count) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    MetalCommandQueue* q = static_cast<MetalCommandQueue*>(factory.m_parent->getCommandQueue());
    return {new MetalGraphicsBufferD<BaseGraphicsData>(m_data, q, use, factory.m_ctx, stride, count)};
  }
}

ObjToken<ITextureS>
MetalDataFactory::Context::newStaticTexture(size_t width, size_t height, size_t mips, TextureFormat fmt,
                                            TextureClampMode clampMode, const void* data, size_t sz) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    return {new MetalTextureS(m_data, factory.m_ctx, width, height, mips, fmt, data, sz)};
  }
}

ObjToken<ITextureSA>
MetalDataFactory::Context::newStaticArrayTexture(size_t width, size_t height, size_t layers, size_t mips,
                                                 TextureFormat fmt, TextureClampMode clampMode,
                                                 const void* data, size_t sz) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    return {new MetalTextureSA(m_data, factory.m_ctx, width, height, layers, mips, fmt, data, sz)};
  }
}

ObjToken<ITextureD>
MetalDataFactory::Context::newDynamicTexture(size_t width, size_t height, TextureFormat fmt,
                                             TextureClampMode clampMode) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    MetalCommandQueue* q = static_cast<MetalCommandQueue*>(factory.m_parent->getCommandQueue());
    return {new MetalTextureD(m_data, q, factory.m_ctx, width, height, fmt)};
  }
}

ObjToken<ITextureR>
MetalDataFactory::Context::newRenderTexture(size_t width, size_t height, TextureClampMode clampMode,
                                            size_t colorBindCount, size_t depthBindCount) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    return {new MetalTextureR(m_data, factory.m_ctx, width, height, factory.m_ctx->m_sampleCount,
                              colorBindCount, depthBindCount)};
  }
}

ObjToken<ITextureCubeR>
MetalDataFactory::Context::newCubeRenderTexture(size_t width, size_t mips) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    return {new MetalTextureCubeR(m_data, factory.m_ctx, width, mips)};
  }
}

ObjToken<IShaderStage>
MetalDataFactory::Context::newShaderStage(const uint8_t* data, size_t size, PipelineStage stage) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    return {new MetalShaderStage(m_data, factory.m_ctx, data, size, stage)};
  }
}

ObjToken<IShaderPipeline>
MetalDataFactory::Context::newShaderPipeline(ObjToken<IShaderStage> vertex, ObjToken<IShaderStage> fragment,
                                             ObjToken<IShaderStage> geometry, ObjToken<IShaderStage> control,
                                             ObjToken<IShaderStage> evaluation, const VertexFormatInfo& vtxFmt,
                                             const AdditionalPipelineInfo& additionalInfo, bool asynchronous) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);

    MetalShaderPipeline* ret;
    if (evaluation) {
      ret = new MetalTessellationShaderPipeline(m_data);
      ret->setup(factory.m_ctx, additionalInfo.depthAttachment ? factory.m_ctx->m_sampleCount : 1,
                 evaluation, fragment, control, vtxFmt, additionalInfo);
    } else {
      ret = new MetalShaderPipeline(m_data);
      ret->setup(factory.m_ctx, additionalInfo.depthAttachment ? factory.m_ctx->m_sampleCount : 1,
                 vertex, fragment, {}, vtxFmt, additionalInfo);
    }
    return {ret};
  }
}

ObjToken<IShaderDataBinding>
MetalDataFactory::Context::newShaderDataBinding(const ObjToken<IShaderPipeline>& pipeline,
                                                const ObjToken<IGraphicsBuffer>& vbo,
                                                const ObjToken<IGraphicsBuffer>& instVbo,
                                                const ObjToken<IGraphicsBuffer>& ibo,
                                                size_t ubufCount, const ObjToken<IGraphicsBuffer>* ubufs,
                                                const PipelineStage* ubufStages,
                                                const size_t* ubufOffs, const size_t* ubufSizes,
                                                size_t texCount, const ObjToken<ITexture>* texs,
                                                const int* texBindIdxs, const bool* depthBind,
                                                size_t baseVert, size_t baseInst) {
  @autoreleasepool {
    MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
    return {new MetalShaderDataBinding(m_data,
                                       factory.m_ctx, pipeline, vbo, instVbo, ibo,
                                       ubufCount, ubufs, ubufStages, ubufOffs,
                                       ubufSizes, texCount, texs, texBindIdxs,
                                       depthBind, baseVert, baseInst)};
  }
}

void MetalDataFactoryImpl::commitTransaction(const FactoryCommitFunc& trans __BooTraceArgs) {
  MetalDataFactory::Context ctx(*this __BooTraceArgsUse);
  trans(ctx);
}

ObjToken<IGraphicsBufferD>
MetalDataFactoryImpl::newPoolBuffer(BufferUse use, size_t stride, size_t count __BooTraceArgs) {
  ObjToken<BaseGraphicsPool> pool(new BaseGraphicsPool(*this __BooTraceArgsUse));
  MetalCommandQueue* q = static_cast<MetalCommandQueue*>(m_parent->getCommandQueue());
  return {new MetalGraphicsBufferD<BaseGraphicsPool>(pool, q, use, m_ctx, stride, count)};
}

std::unique_ptr<IGraphicsCommandQueue> _NewMetalCommandQueue(MetalContext* ctx, IWindow* parentWindow,
                                                             IGraphicsContext* parent) {
  return std::make_unique<MetalCommandQueue>(ctx, parentWindow, parent);
}

std::unique_ptr<IGraphicsDataFactory> _NewMetalDataFactory(IGraphicsContext* parent, MetalContext* ctx) {
  return std::make_unique<MetalDataFactoryImpl>(parent, ctx);
}

std::vector<uint8_t> MetalDataFactory::CompileMetal(const char* source, PipelineStage stage) {
  size_t strSz = strlen(source) + 1;
  std::vector<uint8_t> ret(strSz + 1);
  memcpy(ret.data() + 1, source, strSz);
  return ret;
}

void MetalDataFactoryImpl::SetupGammaResources() {
  m_hasTessellation = [m_ctx->m_dev supportsFeatureSet:MTLFeatureSet_macOS_GPUFamily1_v2];

  commitTransaction([this](IGraphicsDataFactory::Context& ctx) {
    auto vertexMetal = MetalDataFactory::CompileMetal(GammaVS, PipelineStage::Vertex);
    auto vertexShader = ctx.newShaderStage(vertexMetal, PipelineStage::Vertex);
    auto fragmentMetal = MetalDataFactory::CompileMetal(GammaFS, PipelineStage::Fragment);
    auto fragmentShader = ctx.newShaderStage(fragmentMetal, PipelineStage::Fragment);
    const VertexElementDescriptor vfmt[] = {
      {VertexSemantic::Position4},
      {VertexSemantic::UV4}
    };
    VertexFormatInfo vfmtInfo(vfmt);
    AdditionalPipelineInfo info =
    {
      BlendFactor::One, BlendFactor::Zero,
      Primitive::TriStrips, ZTest::None, false, true, false, CullMode::None
    };
    m_gammaShader = ctx.newShaderPipeline(vertexShader, fragmentShader, vfmtInfo, info);
    m_gammaLUT = ctx.newDynamicTexture(256, 256, TextureFormat::I16, TextureClampMode::ClampToEdge);
    setDisplayGamma(1.f);
    const struct Vert {
      float pos[4];
      float uv[4];
    } verts[4] = {
      {{-1.f, 1.f,  0.f, 1.f}, {0.f, 0.f, 0.f, 0.f}},
      {{1.f,  1.f,  0.f, 1.f}, {1.f, 0.f, 0.f, 0.f}},
      {{-1.f, -1.f, 0.f, 1.f}, {0.f, 1.f, 0.f, 0.f}},
      {{1.f,  -1.f, 0.f, 1.f}, {1.f, 1.f, 0.f, 0.f}}
    };
    m_gammaVBO = ctx.newStaticBuffer(BufferUse::Vertex, verts, 32, 4);
    ObjToken<ITexture> texs[] = {{}, m_gammaLUT.get()};
    m_gammaBinding = ctx.newShaderDataBinding(m_gammaShader, m_gammaVBO.get(), {}, {},
                                              0, nullptr, nullptr, 2, texs, nullptr, nullptr);
    return true;
  } BooTrace);
}

}

#endif