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CommandBufferGL: Iterate per pass

This commit is contained in:
Corentin Wallez 2018-07-04 16:06:26 +02:00 committed by Corentin Wallez
parent b3bd35ed88
commit 47fe5c52b5
2 changed files with 267 additions and 235 deletions
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495
src/backend/opengl/CommandBufferGL.cpp
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@ -84,7 +84,7 @@ namespace backend { namespace opengl {
// constants that should be applied before the next draw or dispatch.
class PushConstantTracker {
public:
void OnBeginPass() {
PushConstantTracker() {
for (auto stage : IterateStages(kAllStages)) {
mValues[stage].fill(0);
// No need to set dirty bits as a pipeline will be set before the next operation
@ -152,12 +152,6 @@ namespace backend { namespace opengl {
// This means that we have to re-apply these buffers on an InputState change.
class InputBufferTracker {
public:
void OnBeginPass() {
// We don't know what happened between this pass and the last one, just reset the
// input state so everything gets reapplied.
mLastInputState = nullptr;
}
void OnSetIndexBuffer(BufferBase* buffer) {
mIndexBufferDirty = true;
mIndexBuffer = ToBackend(buffer);
@ -232,6 +226,60 @@ namespace backend { namespace opengl {
InputState* mLastInputState = nullptr;
};
// Handles SetBindGroup commands with the specifics of translating to OpenGL texture and
// buffer units
void ApplyBindGroup(uint32_t index,
BindGroupBase* group,
PipelineLayout* pipelineLayout,
PipelineGL* pipeline) {
const auto& indices = pipelineLayout->GetBindingIndexInfo()[index];
const auto& layout = group->GetLayout()->GetBindingInfo();
for (uint32_t binding : IterateBitSet(layout.mask)) {
switch (layout.types[binding]) {
case nxt::BindingType::UniformBuffer: {
BufferView* view = ToBackend(group->GetBindingAsBufferView(binding));
GLuint buffer = ToBackend(view->GetBuffer())->GetHandle();
GLuint uboIndex = indices[binding];
glBindBufferRange(GL_UNIFORM_BUFFER, uboIndex, buffer, view->GetOffset(),
view->GetSize());
} break;
case nxt::BindingType::Sampler: {
GLuint sampler =
ToBackend(group->GetBindingAsSampler(binding))->GetHandle();
GLuint samplerIndex = indices[binding];
for (auto unit : pipeline->GetTextureUnitsForSampler(samplerIndex)) {
glBindSampler(unit, sampler);
}
} break;
case nxt::BindingType::SampledTexture: {
TextureView* view = ToBackend(group->GetBindingAsTextureView(binding));
Texture* texture = ToBackend(view->GetTexture());
GLuint handle = texture->GetHandle();
GLenum target = texture->GetGLTarget();
GLuint textureIndex = indices[binding];
for (auto unit : pipeline->GetTextureUnitsForTexture(textureIndex)) {
glActiveTexture(GL_TEXTURE0 + unit);
glBindTexture(target, handle);
}
} break;
case nxt::BindingType::StorageBuffer: {
BufferView* view = ToBackend(group->GetBindingAsBufferView(binding));
GLuint buffer = ToBackend(view->GetBuffer())->GetHandle();
GLuint ssboIndex = indices[binding];
glBindBufferRange(GL_SHADER_STORAGE_BUFFER, ssboIndex, buffer,
view->GetOffset(), view->GetSize());
} break;
}
}
}
} // namespace
CommandBuffer::CommandBuffer(CommandBufferBuilder* builder)
@ -244,136 +292,16 @@ namespace backend { namespace opengl {
void CommandBuffer::Execute() {
Command type;
PipelineBase* lastPipeline = nullptr;
PipelineGL* lastGLPipeline = nullptr;
RenderPipeline* lastRenderPipeline = nullptr;
uint32_t indexBufferBaseOffset = 0;
PersistentPipelineState persistentPipelineState;
persistentPipelineState.SetDefaultState();
PushConstantTracker pushConstants;
InputBufferTracker inputBuffers;
GLuint currentFBO = 0;
while (mCommands.NextCommandId(&type)) {
switch (type) {
case Command::BeginComputePass: {
mCommands.NextCommand<BeginComputePassCmd>();
pushConstants.OnBeginPass();
ExecuteComputePass();
} break;
case Command::BeginRenderPass: {
auto* cmd = mCommands.NextCommand<BeginRenderPassCmd>();
RenderPassDescriptor* info = ToBackend(cmd->info.Get());
pushConstants.OnBeginPass();
inputBuffers.OnBeginPass();
// TODO(kainino@chromium.org): This is added to possibly
// work around an issue seen on Windows/Intel. It should
// break any feedback loop before the clears, even if
// there shouldn't be any negative effects from this.
// Investigate whether it's actually needed.
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
// TODO(kainino@chromium.org): possible future
// optimization: create these framebuffers at
// Framebuffer build time (or maybe CommandBuffer build
// time) so they don't have to be created and destroyed
// at draw time.
glGenFramebuffers(1, &currentFBO);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, currentFBO);
// Mapping from attachmentSlot to GL framebuffer
// attachment points. Defaults to zero (GL_NONE).
std::array<GLenum, kMaxColorAttachments> drawBuffers = {};
// Construct GL framebuffer
unsigned int attachmentCount = 0;
for (uint32_t i : IterateBitSet(info->GetColorAttachmentMask())) {
TextureViewBase* textureView = info->GetColorAttachment(i).view.Get();
GLuint texture = ToBackend(textureView->GetTexture())->GetHandle();
// Attach color buffers.
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
GL_TEXTURE_2D, texture, 0);
drawBuffers[i] = GL_COLOR_ATTACHMENT0 + i;
attachmentCount = i + 1;
// TODO(kainino@chromium.org): the color clears (later in
// this function) may be undefined for non-normalized integer formats.
nxt::TextureFormat format = textureView->GetTexture()->GetFormat();
ASSERT(format == nxt::TextureFormat::R8G8B8A8Unorm ||
format == nxt::TextureFormat::R8G8Unorm ||
format == nxt::TextureFormat::R8Unorm ||
format == nxt::TextureFormat::B8G8R8A8Unorm);
}
glDrawBuffers(attachmentCount, drawBuffers.data());
if (info->HasDepthStencilAttachment()) {
TextureViewBase* textureView = info->GetDepthStencilAttachment().view.Get();
GLuint texture = ToBackend(textureView->GetTexture())->GetHandle();
nxt::TextureFormat format = textureView->GetTexture()->GetFormat();
// Attach depth/stencil buffer.
GLenum glAttachment = 0;
// TODO(kainino@chromium.org): it may be valid to just always use
// GL_DEPTH_STENCIL_ATTACHMENT here.
if (TextureFormatHasDepth(format)) {
if (TextureFormatHasStencil(format)) {
glAttachment = GL_DEPTH_STENCIL_ATTACHMENT;
} else {
glAttachment = GL_DEPTH_ATTACHMENT;
}
} else {
glAttachment = GL_STENCIL_ATTACHMENT;
}
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, glAttachment, GL_TEXTURE_2D,
texture, 0);
// TODO(kainino@chromium.org): the depth/stencil clears (later in
// this function) may be undefined for other texture formats.
ASSERT(format == nxt::TextureFormat::D32FloatS8Uint);
}
// Clear framebuffer attachments as needed
for (uint32_t i : IterateBitSet(info->GetColorAttachmentMask())) {
const auto& attachmentInfo = info->GetColorAttachment(i);
// Load op - color
if (attachmentInfo.loadOp == nxt::LoadOp::Clear) {
glClearBufferfv(GL_COLOR, i, attachmentInfo.clearColor.data());
}
}
if (info->HasDepthStencilAttachment()) {
const auto& attachmentInfo = info->GetDepthStencilAttachment();
nxt::TextureFormat attachmentFormat =
attachmentInfo.view->GetTexture()->GetFormat();
// Load op - depth/stencil
bool doDepthClear = TextureFormatHasDepth(attachmentFormat) &&
(attachmentInfo.depthLoadOp == nxt::LoadOp::Clear);
bool doStencilClear = TextureFormatHasStencil(attachmentFormat) &&
(attachmentInfo.stencilLoadOp == nxt::LoadOp::Clear);
if (doDepthClear && doStencilClear) {
glClearBufferfi(GL_DEPTH_STENCIL, 0, attachmentInfo.clearDepth,
attachmentInfo.clearStencil);
} else if (doDepthClear) {
glClearBufferfv(GL_DEPTH, 0, &attachmentInfo.clearDepth);
} else if (doStencilClear) {
const GLint clearStencil = attachmentInfo.clearStencil;
glClearBufferiv(GL_STENCIL, 0, &clearStencil);
}
}
glBlendColor(0, 0, 0, 0);
glViewport(0, 0, info->GetWidth(), info->GetHeight());
glScissor(0, 0, info->GetWidth(), info->GetHeight());
ExecuteRenderPass(ToBackend(cmd->info.Get()));
} break;
case Command::CopyBufferToBuffer: {
@ -446,26 +374,212 @@ namespace backend { namespace opengl {
glDeleteFramebuffers(1, &readFBO);
} break;
case Command::TransitionBufferUsage: {
TransitionBufferUsageCmd* cmd =
mCommands.NextCommand<TransitionBufferUsageCmd>();
cmd->buffer->UpdateUsageInternal(cmd->usage);
} break;
case Command::TransitionTextureUsage: {
TransitionTextureUsageCmd* cmd =
mCommands.NextCommand<TransitionTextureUsageCmd>();
cmd->texture->UpdateUsageInternal(cmd->usage);
} break;
default: { UNREACHABLE(); } break;
}
}
}
void CommandBuffer::ExecuteComputePass() {
PushConstantTracker pushConstants;
ComputePipeline* lastPipeline = nullptr;
Command type;
while (mCommands.NextCommandId(&type)) {
switch (type) {
case Command::EndComputePass: {
mCommands.NextCommand<EndComputePassCmd>();
return;
} break;
case Command::Dispatch: {
DispatchCmd* dispatch = mCommands.NextCommand<DispatchCmd>();
pushConstants.Apply(lastPipeline, lastGLPipeline);
pushConstants.Apply(lastPipeline, lastPipeline);
glDispatchCompute(dispatch->x, dispatch->y, dispatch->z);
// TODO(cwallez@chromium.org): add barriers to the API
glMemoryBarrier(GL_ALL_BARRIER_BITS);
} break;
case Command::SetComputePipeline: {
SetComputePipelineCmd* cmd = mCommands.NextCommand<SetComputePipelineCmd>();
lastPipeline = ToBackend(cmd->pipeline).Get();
lastPipeline->ApplyNow();
pushConstants.OnSetPipeline(lastPipeline);
} break;
case Command::SetPushConstants: {
SetPushConstantsCmd* cmd = mCommands.NextCommand<SetPushConstantsCmd>();
uint32_t* data = mCommands.NextData<uint32_t>(cmd->count);
pushConstants.OnSetPushConstants(cmd->stages, cmd->count, cmd->offset, data);
} break;
case Command::SetBindGroup: {
SetBindGroupCmd* cmd = mCommands.NextCommand<SetBindGroupCmd>();
ApplyBindGroup(cmd->index, cmd->group.Get(),
ToBackend(lastPipeline->GetLayout()), lastPipeline);
} break;
default: { UNREACHABLE(); } break;
}
}
// EndComputePass should have been called
UNREACHABLE();
}
void CommandBuffer::ExecuteRenderPass(RenderPassDescriptorBase* renderPass) {
GLuint fbo = 0;
// Create the framebuffer used for this render pass and calls the correct glDrawBuffers
{
// TODO(kainino@chromium.org): This is added to possibly work around an issue seen on
// Windows/Intel. It should break any feedback loop before the clears, even if there
// shouldn't be any negative effects from this. Investigate whether it's actually
// needed.
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
// TODO(kainino@chromium.org): possible future optimization: create these framebuffers
// at Framebuffer build time (or maybe CommandBuffer build time) so they don't have to
// be created and destroyed at draw time.
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
// Mapping from attachmentSlot to GL framebuffer attachment points. Defaults to zero
// (GL_NONE).
std::array<GLenum, kMaxColorAttachments> drawBuffers = {};
// Construct GL framebuffer
unsigned int attachmentCount = 0;
for (uint32_t i : IterateBitSet(renderPass->GetColorAttachmentMask())) {
TextureViewBase* textureView = renderPass->GetColorAttachment(i).view.Get();
GLuint texture = ToBackend(textureView->GetTexture())->GetHandle();
// Attach color buffers.
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D,
texture, 0);
drawBuffers[i] = GL_COLOR_ATTACHMENT0 + i;
attachmentCount = i + 1;
// TODO(kainino@chromium.org): the color clears (later in
// this function) may be undefined for non-normalized integer formats.
nxt::TextureFormat format = textureView->GetTexture()->GetFormat();
ASSERT(format == nxt::TextureFormat::R8G8B8A8Unorm ||
format == nxt::TextureFormat::R8G8Unorm ||
format == nxt::TextureFormat::R8Unorm ||
format == nxt::TextureFormat::B8G8R8A8Unorm);
}
glDrawBuffers(attachmentCount, drawBuffers.data());
if (renderPass->HasDepthStencilAttachment()) {
TextureViewBase* textureView = renderPass->GetDepthStencilAttachment().view.Get();
GLuint texture = ToBackend(textureView->GetTexture())->GetHandle();
nxt::TextureFormat format = textureView->GetTexture()->GetFormat();
// Attach depth/stencil buffer.
GLenum glAttachment = 0;
// TODO(kainino@chromium.org): it may be valid to just always use
// GL_DEPTH_STENCIL_ATTACHMENT here.
if (TextureFormatHasDepth(format)) {
if (TextureFormatHasStencil(format)) {
glAttachment = GL_DEPTH_STENCIL_ATTACHMENT;
} else {
glAttachment = GL_DEPTH_ATTACHMENT;
}
} else {
glAttachment = GL_STENCIL_ATTACHMENT;
}
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, glAttachment, GL_TEXTURE_2D, texture,
0);
// TODO(kainino@chromium.org): the depth/stencil clears (later in
// this function) may be undefined for other texture formats.
ASSERT(format == nxt::TextureFormat::D32FloatS8Uint);
}
}
// Clear framebuffer attachments as needed
{
for (uint32_t i : IterateBitSet(renderPass->GetColorAttachmentMask())) {
const auto& attachmentInfo = renderPass->GetColorAttachment(i);
// Load op - color
if (attachmentInfo.loadOp == nxt::LoadOp::Clear) {
glClearBufferfv(GL_COLOR, i, attachmentInfo.clearColor.data());
}
}
if (renderPass->HasDepthStencilAttachment()) {
const auto& attachmentInfo = renderPass->GetDepthStencilAttachment();
nxt::TextureFormat attachmentFormat =
attachmentInfo.view->GetTexture()->GetFormat();
// Load op - depth/stencil
bool doDepthClear = TextureFormatHasDepth(attachmentFormat) &&
(attachmentInfo.depthLoadOp == nxt::LoadOp::Clear);
bool doStencilClear = TextureFormatHasStencil(attachmentFormat) &&
(attachmentInfo.stencilLoadOp == nxt::LoadOp::Clear);
if (doDepthClear && doStencilClear) {
glClearBufferfi(GL_DEPTH_STENCIL, 0, attachmentInfo.clearDepth,
attachmentInfo.clearStencil);
} else if (doDepthClear) {
glClearBufferfv(GL_DEPTH, 0, &attachmentInfo.clearDepth);
} else if (doStencilClear) {
const GLint clearStencil = attachmentInfo.clearStencil;
glClearBufferiv(GL_STENCIL, 0, &clearStencil);
}
}
}
RenderPipeline* lastPipeline = nullptr;
uint32_t indexBufferBaseOffset = 0;
PersistentPipelineState persistentPipelineState;
PushConstantTracker pushConstants;
InputBufferTracker inputBuffers;
// Set defaults for dynamic state
persistentPipelineState.SetDefaultState();
glBlendColor(0, 0, 0, 0);
glViewport(0, 0, renderPass->GetWidth(), renderPass->GetHeight());
glScissor(0, 0, renderPass->GetWidth(), renderPass->GetHeight());
Command type;
while (mCommands.NextCommandId(&type)) {
switch (type) {
case Command::EndRenderPass: {
mCommands.NextCommand<EndRenderPassCmd>();
glDeleteFramebuffers(1, &fbo);
return;
} break;
case Command::DrawArrays: {
DrawArraysCmd* draw = mCommands.NextCommand<DrawArraysCmd>();
pushConstants.Apply(lastPipeline, lastGLPipeline);
pushConstants.Apply(lastPipeline, lastPipeline);
inputBuffers.Apply();
if (draw->firstInstance > 0) {
glDrawArraysInstancedBaseInstance(
lastRenderPipeline->GetGLPrimitiveTopology(), draw->firstVertex,
draw->vertexCount, draw->instanceCount, draw->firstInstance);
glDrawArraysInstancedBaseInstance(lastPipeline->GetGLPrimitiveTopology(),
draw->firstVertex, draw->vertexCount,
draw->instanceCount, draw->firstInstance);
} else {
// This branch is only needed on OpenGL < 4.2
glDrawArraysInstanced(lastRenderPipeline->GetGLPrimitiveTopology(),
glDrawArraysInstanced(lastPipeline->GetGLPrimitiveTopology(),
draw->firstVertex, draw->vertexCount,
draw->instanceCount);
}
@ -473,58 +587,36 @@ namespace backend { namespace opengl {
case Command::DrawElements: {
DrawElementsCmd* draw = mCommands.NextCommand<DrawElementsCmd>();
pushConstants.Apply(lastPipeline, lastGLPipeline);
pushConstants.Apply(lastPipeline, lastPipeline);
inputBuffers.Apply();
nxt::IndexFormat indexFormat = lastRenderPipeline->GetIndexFormat();
nxt::IndexFormat indexFormat = lastPipeline->GetIndexFormat();
size_t formatSize = IndexFormatSize(indexFormat);
GLenum formatType = IndexFormatType(indexFormat);
if (draw->firstInstance > 0) {
glDrawElementsInstancedBaseInstance(
lastRenderPipeline->GetGLPrimitiveTopology(), draw->indexCount,
formatType,
lastPipeline->GetGLPrimitiveTopology(), draw->indexCount, formatType,
reinterpret_cast<void*>(draw->firstIndex * formatSize +
indexBufferBaseOffset),
draw->instanceCount, draw->firstInstance);
} else {
// This branch is only needed on OpenGL < 4.2
glDrawElementsInstanced(
lastRenderPipeline->GetGLPrimitiveTopology(), draw->indexCount,
formatType,
lastPipeline->GetGLPrimitiveTopology(), draw->indexCount, formatType,
reinterpret_cast<void*>(draw->firstIndex * formatSize +
indexBufferBaseOffset),
draw->instanceCount);
}
} break;
case Command::EndComputePass: {
mCommands.NextCommand<EndComputePassCmd>();
} break;
case Command::EndRenderPass: {
mCommands.NextCommand<EndRenderPassCmd>();
glDeleteFramebuffers(1, &currentFBO);
currentFBO = 0;
} break;
case Command::SetComputePipeline: {
SetComputePipelineCmd* cmd = mCommands.NextCommand<SetComputePipelineCmd>();
ToBackend(cmd->pipeline)->ApplyNow();
lastGLPipeline = ToBackend(cmd->pipeline).Get();
lastPipeline = ToBackend(cmd->pipeline).Get();
pushConstants.OnSetPipeline(lastPipeline);
} break;
case Command::SetRenderPipeline: {
SetRenderPipelineCmd* cmd = mCommands.NextCommand<SetRenderPipelineCmd>();
ToBackend(cmd->pipeline)->ApplyNow(persistentPipelineState);
lastRenderPipeline = ToBackend(cmd->pipeline).Get();
lastGLPipeline = ToBackend(cmd->pipeline).Get();
lastPipeline = ToBackend(cmd->pipeline).Get();
lastPipeline->ApplyNow(persistentPipelineState);
pushConstants.OnSetPipeline(lastPipeline);
inputBuffers.OnSetPipeline(lastRenderPipeline);
inputBuffers.OnSetPipeline(lastPipeline);
} break;
case Command::SetPushConstants: {
@ -550,62 +642,8 @@ namespace backend { namespace opengl {
case Command::SetBindGroup: {
SetBindGroupCmd* cmd = mCommands.NextCommand<SetBindGroupCmd>();
size_t groupIndex = cmd->index;
BindGroup* group = ToBackend(cmd->group.Get());
const auto& indices =
ToBackend(lastPipeline->GetLayout())->GetBindingIndexInfo()[groupIndex];
const auto& layout = group->GetLayout()->GetBindingInfo();
for (uint32_t binding : IterateBitSet(layout.mask)) {
switch (layout.types[binding]) {
case nxt::BindingType::UniformBuffer: {
BufferView* view =
ToBackend(group->GetBindingAsBufferView(binding));
GLuint buffer = ToBackend(view->GetBuffer())->GetHandle();
GLuint uboIndex = indices[binding];
glBindBufferRange(GL_UNIFORM_BUFFER, uboIndex, buffer,
view->GetOffset(), view->GetSize());
} break;
case nxt::BindingType::Sampler: {
GLuint sampler =
ToBackend(group->GetBindingAsSampler(binding))->GetHandle();
GLuint samplerIndex = indices[binding];
for (auto unit :
lastGLPipeline->GetTextureUnitsForSampler(samplerIndex)) {
glBindSampler(unit, sampler);
}
} break;
case nxt::BindingType::SampledTexture: {
TextureView* view =
ToBackend(group->GetBindingAsTextureView(binding));
Texture* texture = ToBackend(view->GetTexture());
GLuint handle = texture->GetHandle();
GLenum target = texture->GetGLTarget();
GLuint textureIndex = indices[binding];
for (auto unit :
lastGLPipeline->GetTextureUnitsForTexture(textureIndex)) {
glActiveTexture(GL_TEXTURE0 + unit);
glBindTexture(target, handle);
}
} break;
case nxt::BindingType::StorageBuffer: {
BufferView* view =
ToBackend(group->GetBindingAsBufferView(binding));
GLuint buffer = ToBackend(view->GetBuffer())->GetHandle();
GLuint ssboIndex = indices[binding];
glBindBufferRange(GL_SHADER_STORAGE_BUFFER, ssboIndex, buffer,
view->GetOffset(), view->GetSize());
} break;
}
}
ApplyBindGroup(cmd->index, cmd->group.Get(),
ToBackend(lastPipeline->GetLayout()), lastPipeline);
} break;
case Command::SetIndexBuffer: {
@ -621,25 +659,12 @@ namespace backend { namespace opengl {
inputBuffers.OnSetVertexBuffers(cmd->startSlot, cmd->count, buffers, offsets);
} break;
case Command::TransitionBufferUsage: {
TransitionBufferUsageCmd* cmd =
mCommands.NextCommand<TransitionBufferUsageCmd>();
cmd->buffer->UpdateUsageInternal(cmd->usage);
} break;
case Command::TransitionTextureUsage: {
TransitionTextureUsageCmd* cmd =
mCommands.NextCommand<TransitionTextureUsageCmd>();
cmd->texture->UpdateUsageInternal(cmd->usage);
} break;
default: { UNREACHABLE(); } break;
}
}
// HACK: cleanup a tiny bit of state to make this work with
// virtualized contexts enabled in Chromium
glBindSampler(0, 0);
// EndRenderPass should have been called
UNREACHABLE();
}
}} // namespace backend::opengl

7
src/backend/opengl/CommandBufferGL.h
View File

@ -18,6 +18,10 @@
#include "backend/CommandAllocator.h"
#include "backend/CommandBuffer.h"
namespace backend {
class RenderPassDescriptorBase;
} // namespace backend
namespace backend { namespace opengl {
class Device;
@ -30,6 +34,9 @@ namespace backend { namespace opengl {
void Execute();
private:
void ExecuteComputePass();
void ExecuteRenderPass(RenderPassDescriptorBase* renderPass);
CommandIterator mCommands;
};