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aurora/lib/gfx/model/shader.cpp

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#include "shader.hpp"
#include "../../webgpu/gpu.hpp"
#include <absl/container/flat_hash_map.h>
namespace aurora::gfx::model {
static Module Log("aurora::gfx::model");
template <typename T>
constexpr T bswap16(T val) noexcept {
static_assert(sizeof(T) == sizeof(u16));
union {
u16 u;
T t;
} v{.t = val};
#if __GNUC__
v.u = __builtin_bswap16(v.u);
#elif _WIN32
v.u = _byteswap_ushort(v.u);
#else
v.u = (v.u << 8) | ((v.u >> 8) & 0xFF);
#endif
return v.t;
}
template <typename T>
constexpr T bswap32(T val) noexcept {
static_assert(sizeof(T) == sizeof(u32));
union {
u32 u;
T t;
} v{.t = val};
#if __GNUC__
v.u = __builtin_bswap32(v.u);
#elif _WIN32
v.u = _byteswap_ulong(v.u);
#else
v.u = ((v.u & 0x0000FFFF) << 16) | ((v.u & 0xFFFF0000) >> 16) | ((v.u & 0x00FF00FF) << 8) | ((v.u & 0xFF00FF00) >> 8);
#endif
return v.t;
}
using IndexedAttrs = std::array<bool, GX_VA_MAX_ATTR>;
struct DisplayListCache {
ByteBuffer vtxBuf;
ByteBuffer idxBuf;
IndexedAttrs indexedAttrs;
DisplayListCache(ByteBuffer&& vtxBuf, ByteBuffer&& idxBuf, IndexedAttrs indexedAttrs)
: vtxBuf(std::move(vtxBuf)), idxBuf(std::move(idxBuf)), indexedAttrs(indexedAttrs) {}
};
static absl::flat_hash_map<HashType, DisplayListCache> sCachedDisplayLists;
static u32 prepare_vtx_buffer(ByteBuffer& buf, GXVtxFmt vtxfmt, const u8* ptr, u16 vtxCount,
IndexedAttrs& indexedAttrs) {
using aurora::gfx::gx::g_gxState;
struct {
u8 count;
GXCompType type;
} attrArrays[GX_VA_MAX_ATTR] = {};
u32 vtxSize = 0;
u32 outVtxSize = 0;
// Calculate attribute offsets and vertex size
for (int attr = 0; attr < GX_VA_MAX_ATTR; attr++) {
const auto& attrFmt = g_gxState.vtxFmts[vtxfmt].attrs[attr];
switch (g_gxState.vtxDesc[attr]) {
case GX_NONE:
break;
case GX_DIRECT:
#define COMBINE(val1, val2, val3) (((val1) << 16) | ((val2) << 8) | (val3))
switch (COMBINE(attr, attrFmt.cnt, attrFmt.type)) {
case COMBINE(GX_VA_POS, GX_POS_XYZ, GX_F32):
case COMBINE(GX_VA_NRM, GX_NRM_XYZ, GX_F32):
attrArrays[attr].count = 3;
attrArrays[attr].type = GX_F32;
vtxSize += 12;
outVtxSize += 12;
break;
case COMBINE(GX_VA_POS, GX_POS_XYZ, GX_S16):
case COMBINE(GX_VA_NRM, GX_NRM_XYZ, GX_S16):
attrArrays[attr].count = 3;
attrArrays[attr].type = GX_S16;
vtxSize += 6;
outVtxSize += 12;
break;
case COMBINE(GX_VA_TEX0, GX_TEX_ST, GX_F32):
case COMBINE(GX_VA_TEX1, GX_TEX_ST, GX_F32):
case COMBINE(GX_VA_TEX2, GX_TEX_ST, GX_F32):
case COMBINE(GX_VA_TEX3, GX_TEX_ST, GX_F32):
case COMBINE(GX_VA_TEX4, GX_TEX_ST, GX_F32):
case COMBINE(GX_VA_TEX5, GX_TEX_ST, GX_F32):
case COMBINE(GX_VA_TEX6, GX_TEX_ST, GX_F32):
case COMBINE(GX_VA_TEX7, GX_TEX_ST, GX_F32):
attrArrays[attr].count = 2;
attrArrays[attr].type = GX_F32;
vtxSize += 8;
outVtxSize += 8;
break;
case COMBINE(GX_VA_TEX0, GX_TEX_ST, GX_S16):
case COMBINE(GX_VA_TEX1, GX_TEX_ST, GX_S16):
case COMBINE(GX_VA_TEX2, GX_TEX_ST, GX_S16):
case COMBINE(GX_VA_TEX3, GX_TEX_ST, GX_S16):
case COMBINE(GX_VA_TEX4, GX_TEX_ST, GX_S16):
case COMBINE(GX_VA_TEX5, GX_TEX_ST, GX_S16):
case COMBINE(GX_VA_TEX6, GX_TEX_ST, GX_S16):
case COMBINE(GX_VA_TEX7, GX_TEX_ST, GX_S16):
attrArrays[attr].count = 2;
attrArrays[attr].type = GX_S16;
vtxSize += 4;
outVtxSize += 8;
break;
case COMBINE(GX_VA_CLR0, GX_CLR_RGBA, GX_RGBA8):
case COMBINE(GX_VA_CLR1, GX_CLR_RGBA, GX_RGBA8):
attrArrays[attr].count = 4;
attrArrays[attr].type = GX_RGBA8;
vtxSize += 4;
outVtxSize += 16;
break;
default:
Log.report(LOG_FATAL, FMT_STRING("not handled: attr {}, cnt {}, type {}"), attr, attrFmt.cnt, attrFmt.type);
break;
}
#undef COMBINE
break;
case GX_INDEX8:
++vtxSize;
outVtxSize += 2;
indexedAttrs[attr] = true;
break;
case GX_INDEX16:
vtxSize += 2;
outVtxSize += 2;
indexedAttrs[attr] = true;
break;
default:
Log.report(LOG_FATAL, FMT_STRING("unhandled attribute type {}"), g_gxState.vtxDesc[attr]);
}
}
// Align to 4
int rem = outVtxSize % 4;
int padding = 0;
if (rem != 0) {
padding = 4 - rem;
outVtxSize += padding;
}
// Build vertex buffer
buf.reserve_extra(vtxCount * outVtxSize);
std::array<f32, 4> out{};
for (u32 v = 0; v < vtxCount; ++v) {
for (int attr = 0; attr < GX_VA_MAX_ATTR; attr++) {
if (g_gxState.vtxDesc[attr] == GX_INDEX8) {
u16 index = *ptr;
buf.append(&index, 2);
++ptr;
} else if (g_gxState.vtxDesc[attr] == GX_INDEX16) {
u16 index = bswap16(*reinterpret_cast<const u16*>(ptr));
buf.append(&index, 2);
ptr += 2;
}
if (g_gxState.vtxDesc[attr] != GX_DIRECT) {
continue;
}
const auto& attrFmt = g_gxState.vtxFmts[vtxfmt].attrs[attr];
u8 count = attrArrays[attr].count;
switch (attrArrays[attr].type) {
case GX_U8:
for (int i = 0; i < count; ++i) {
const auto value = reinterpret_cast<const u8*>(ptr)[i];
out[i] = static_cast<f32>(value) / static_cast<f32>(1 << attrFmt.frac);
}
buf.append(out.data(), sizeof(f32) * count);
ptr += count;
break;
case GX_S8:
for (int i = 0; i < count; ++i) {
const auto value = reinterpret_cast<const s8*>(ptr)[i];
out[i] = static_cast<f32>(value) / static_cast<f32>(1 << attrFmt.frac);
}
buf.append(out.data(), sizeof(f32) * count);
ptr += count;
break;
case GX_U16:
for (int i = 0; i < count; ++i) {
const auto value = bswap16(reinterpret_cast<const u16*>(ptr)[i]);
out[i] = static_cast<f32>(value) / static_cast<f32>(1 << attrFmt.frac);
}
buf.append(out.data(), sizeof(f32) * count);
ptr += count * sizeof(u16);
break;
case GX_S16:
for (int i = 0; i < count; ++i) {
const auto value = bswap16(reinterpret_cast<const s16*>(ptr)[i]);
out[i] = static_cast<f32>(value) / static_cast<f32>(1 << attrFmt.frac);
}
buf.append(out.data(), sizeof(f32) * count);
ptr += count * sizeof(s16);
break;
case GX_F32:
for (int i = 0; i < count; ++i) {
out[i] = bswap32(reinterpret_cast<const f32*>(ptr)[i]);
}
buf.append(out.data(), sizeof(f32) * count);
ptr += count * sizeof(f32);
break;
case GX_RGBA8:
out[0] = static_cast<f32>(ptr[0]) / 255.f;
out[1] = static_cast<f32>(ptr[1]) / 255.f;
out[2] = static_cast<f32>(ptr[2]) / 255.f;
out[3] = static_cast<f32>(ptr[3]) / 255.f;
buf.append(out.data(), sizeof(f32) * 4);
ptr += sizeof(u32);
break;
}
}
if (padding > 0) {
buf.append_zeroes(padding);
}
}
return vtxSize;
}
static u16 prepare_idx_buffer(ByteBuffer& buf, GXPrimitive prim, u16 vtxStart, u16 vtxCount) {
u16 numIndices = 0;
if (prim == GX_TRIANGLES) {
buf.reserve_extra(vtxCount * sizeof(u16));
for (u16 v = 0; v < vtxCount; ++v) {
const u16 idx = vtxStart + v;
buf.append(&idx, sizeof(u16));
++numIndices;
}
} else if (prim == GX_TRIANGLEFAN) {
buf.reserve_extra(((u32(vtxCount) - 3) * 3 + 3) * sizeof(u16));
for (u16 v = 0; v < vtxCount; ++v) {
const u16 idx = vtxStart + v;
if (v < 3) {
buf.append(&idx, sizeof(u16));
++numIndices;
continue;
}
const std::array<u16, 3> idxs{vtxStart, u16(idx - 1), idx};
buf.append(idxs.data(), sizeof(u16) * 3);
numIndices += 3;
}
} else if (prim == GX_TRIANGLESTRIP) {
buf.reserve_extra(((u32(vtxCount) - 3) * 3 + 3) * sizeof(u16));
for (u16 v = 0; v < vtxCount; ++v) {
const u16 idx = vtxStart + v;
if (v < 3) {
buf.append(&idx, sizeof(u16));
++numIndices;
continue;
}
if ((v & 1) == 0) {
const std::array<u16, 3> idxs{u16(idx - 2), u16(idx - 1), idx};
buf.append(idxs.data(), sizeof(u16) * 3);
} else {
const std::array<u16, 3> idxs{u16(idx - 1), u16(idx - 2), idx};
buf.append(idxs.data(), sizeof(u16) * 3);
}
numIndices += 3;
}
} else {
Log.report(LOG_FATAL, FMT_STRING("Unsupported primitive type {}"), static_cast<u32>(prim));
}
return numIndices;
}
void queue_surface(const u8* dlStart, u32 dlSize) noexcept {
const auto hash = xxh3_hash_s(dlStart, dlSize, 0);
Range vertRange, idxRange;
u32 numIndices = 0;
IndexedAttrs indexedAttrs{};
auto it = sCachedDisplayLists.find(hash);
if (it != sCachedDisplayLists.end()) {
const auto& cache = it->second;
numIndices = cache.idxBuf.size() / 2;
vertRange = push_verts(cache.vtxBuf.data(), cache.vtxBuf.size());
idxRange = push_indices(cache.idxBuf.data(), cache.idxBuf.size());
indexedAttrs = cache.indexedAttrs;
} else {
const u8* data = dlStart;
u32 pos = 0;
ByteBuffer vtxBuf;
ByteBuffer idxBuf;
u16 vtxStart = 0;
while (pos < dlSize) {
u8 cmd = data[pos++];
u8 opcode = cmd & GX_OPCODE_MASK;
switch (opcode) {
case GX_NOP:
continue;
case GX_LOAD_BP_REG:
// TODO?
pos += 4;
break;
case GX_DRAW_QUADS:
case GX_DRAW_TRIANGLES:
case GX_DRAW_TRIANGLE_STRIP:
case GX_DRAW_TRIANGLE_FAN: {
const auto prim = static_cast<GXPrimitive>(opcode);
const auto fmt = static_cast<GXVtxFmt>(cmd & GX_VAT_MASK);
u16 vtxCount = bswap16(*reinterpret_cast<const u16*>(data + pos));
pos += 2;
pos += vtxCount * prepare_vtx_buffer(vtxBuf, fmt, data + pos, vtxCount, indexedAttrs);
numIndices += prepare_idx_buffer(idxBuf, prim, vtxStart, vtxCount);
vtxStart += vtxCount;
break;
}
case GX_DRAW_LINES:
case GX_DRAW_LINE_STRIP:
case GX_DRAW_POINTS:
Log.report(LOG_FATAL, FMT_STRING("unimplemented prim type: {}"), opcode);
break;
default:
Log.report(LOG_FATAL, FMT_STRING("unimplemented opcode: {}"), opcode);
break;
}
}
vertRange = push_verts(vtxBuf.data(), vtxBuf.size());
idxRange = push_indices(idxBuf.data(), idxBuf.size());
sCachedDisplayLists.try_emplace(hash, std::move(vtxBuf), std::move(idxBuf), indexedAttrs);
}
gx::BindGroupRanges ranges{};
int lastIndexedAttr = -1;
for (int i = 0; i < GX_VA_MAX_ATTR; ++i) {
if (!indexedAttrs[i]) {
continue;
}
auto& array = gx::g_gxState.arrays[i];
if (lastIndexedAttr >= 0 && array == gx::g_gxState.arrays[lastIndexedAttr]) {
// Reuse range from last attribute in shader
// Don't set the output range, so it remains unbound
const auto range = gx::g_gxState.arrays[lastIndexedAttr].cachedRange;
array.cachedRange = range;
} else if (array.cachedRange.size > 0) {
// Use the currently cached range
ranges.vaRanges[i] = array.cachedRange;
} else {
// Push array data to storage and cache range
const auto range = push_storage(static_cast<const uint8_t*>(array.data), array.size);
ranges.vaRanges[i] = range;
array.cachedRange = range;
}
lastIndexedAttr = i;
}
model::PipelineConfig config{};
populate_pipeline_config(config, GX_TRIANGLES);
const auto info = gx::build_shader_info(config.shaderConfig);
const auto bindGroups = gx::build_bind_groups(info, config.shaderConfig, ranges);
const auto pipeline = pipeline_ref(config);
push_draw_command(model::DrawData{
.pipeline = pipeline,
.vertRange = vertRange,
.idxRange = idxRange,
.dataRanges = ranges,
.uniformRange = build_uniform(info),
.indexCount = numIndices,
.bindGroups = bindGroups,
.dstAlpha = gx::g_gxState.dstAlpha,
});
}
State construct_state() { return {}; }
WGPURenderPipeline create_pipeline(const State& state, [[maybe_unused]] const PipelineConfig& config) {
const auto info = build_shader_info(config.shaderConfig); // TODO remove
const auto shader = build_shader(config.shaderConfig, info);
std::array<WGPUVertexAttribute, gx::MaxVtxAttr> vtxAttrs{};
auto [num4xAttr, rem] = std::div(config.shaderConfig.indexedAttributeCount, 4);
u32 num2xAttr = 0;
if (rem > 2) {
++num4xAttr;
} else if (rem > 0) {
++num2xAttr;
}
u32 offset = 0;
u32 shaderLocation = 0;
// Indexed attributes
for (u32 i = 0; i < num4xAttr; ++i) {
vtxAttrs[shaderLocation] = {
.format = WGPUVertexFormat_Sint16x4,
.offset = offset,
.shaderLocation = shaderLocation,
};
offset += 8;
++shaderLocation;
}
for (u32 i = 0; i < num2xAttr; ++i) {
vtxAttrs[shaderLocation] = {
.format = WGPUVertexFormat_Sint16x2,
.offset = offset,
.shaderLocation = shaderLocation,
};
offset += 4;
++shaderLocation;
}
// Direct attributes
for (int i = 0; i < gx::MaxVtxAttr; ++i) {
const auto attrType = config.shaderConfig.vtxAttrs[i];
if (attrType != GX_DIRECT) {
continue;
}
const auto attr = static_cast<GXAttr>(i);
switch (attr) {
case GX_VA_POS:
case GX_VA_NRM:
vtxAttrs[shaderLocation] = WGPUVertexAttribute{
.format = WGPUVertexFormat_Float32x3,
.offset = offset,
.shaderLocation = shaderLocation,
};
offset += 12;
break;
case GX_VA_CLR0:
case GX_VA_CLR1:
vtxAttrs[shaderLocation] = WGPUVertexAttribute{
.format = WGPUVertexFormat_Float32x4,
.offset = offset,
.shaderLocation = shaderLocation,
};
offset += 16;
break;
case GX_VA_TEX0:
case GX_VA_TEX1:
case GX_VA_TEX2:
case GX_VA_TEX3:
case GX_VA_TEX4:
case GX_VA_TEX5:
case GX_VA_TEX6:
case GX_VA_TEX7:
vtxAttrs[shaderLocation] = WGPUVertexAttribute{
.format = WGPUVertexFormat_Float32x2,
.offset = offset,
.shaderLocation = shaderLocation,
};
offset += 8;
break;
default:
Log.report(LOG_FATAL, FMT_STRING("unhandled direct attr {}"), i);
}
++shaderLocation;
}
const std::array vtxBuffers{WGPUVertexBufferLayout{
.arrayStride = offset,
.stepMode = WGPUVertexStepMode_Vertex,
.attributeCount = shaderLocation,
.attributes = vtxAttrs.data(),
}};
return build_pipeline(config, info, vtxBuffers, shader, "GX Pipeline");
}
void render(const State& state, const DrawData& data, const WGPURenderPassEncoder& pass) {
if (!bind_pipeline(data.pipeline, pass)) {
return;
}
std::array<uint32_t, GX_VA_MAX_ATTR + 1> offsets{data.uniformRange.offset};
uint32_t bindIdx = 1;
for (uint32_t i = 0; i < GX_VA_MAX_ATTR; ++i) {
const auto& range = data.dataRanges.vaRanges[i];
if (range.size <= 0) {
continue;
}
offsets[bindIdx] = range.offset;
++bindIdx;
}
wgpuRenderPassEncoderSetBindGroup(pass, 0, find_bind_group(data.bindGroups.uniformBindGroup), bindIdx,
offsets.data());
if (data.bindGroups.samplerBindGroup && data.bindGroups.textureBindGroup) {
wgpuRenderPassEncoderSetBindGroup(pass, 1, find_bind_group(data.bindGroups.samplerBindGroup), 0, nullptr);
wgpuRenderPassEncoderSetBindGroup(pass, 2, find_bind_group(data.bindGroups.textureBindGroup), 0, nullptr);
}
wgpuRenderPassEncoderSetVertexBuffer(pass, 0, g_vertexBuffer, data.vertRange.offset, data.vertRange.size);
wgpuRenderPassEncoderSetIndexBuffer(pass, g_indexBuffer, WGPUIndexFormat_Uint16, data.idxRange.offset,
data.idxRange.size);
if (data.dstAlpha != UINT32_MAX) {
const WGPUColor color{0.f, 0.f, 0.f, data.dstAlpha / 255.f};
wgpuRenderPassEncoderSetBlendConstant(pass, &color);
}
wgpuRenderPassEncoderDrawIndexed(pass, data.indexCount, 1, 0, 0, 0);
}
} // namespace aurora::gfx::model
static absl::flat_hash_map<aurora::HashType, aurora::gfx::Range> sCachedRanges;
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