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// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "dawn_native/opengl/PipelineGL.h"
#include "common/BitSetIterator.h"
#include "common/Log.h"
#include "dawn_native/BindGroupLayout.h"
#include "dawn_native/Device.h"
#include "dawn_native/Pipeline.h"
#include "dawn_native/opengl/Forward.h"
#include "dawn_native/opengl/OpenGLFunctions.h"
#include "dawn_native/opengl/PipelineLayoutGL.h"
#include "dawn_native/opengl/SamplerGL.h"
#include "dawn_native/opengl/ShaderModuleGL.h"
#include <set>
namespace dawn_native { namespace opengl {
namespace {
GLenum GLShaderType(SingleShaderStage stage) {
switch (stage) {
case SingleShaderStage::Vertex:
return GL_VERTEX_SHADER;
case SingleShaderStage::Fragment:
return GL_FRAGMENT_SHADER;
case SingleShaderStage::Compute:
return GL_COMPUTE_SHADER;
}
}
} // namespace
PipelineGL::PipelineGL() = default;
PipelineGL::~PipelineGL() = default;
void PipelineGL::Initialize(const OpenGLFunctions& gl,
const PipelineLayout* layout,
const PerStage<ProgrammableStage>& stages) {
auto CreateShader = [](const OpenGLFunctions& gl, GLenum type,
const char* source) -> GLuint {
GLuint shader = gl.CreateShader(type);
gl.ShaderSource(shader, 1, &source, nullptr);
gl.CompileShader(shader);
GLint compileStatus = GL_FALSE;
gl.GetShaderiv(shader, GL_COMPILE_STATUS, &compileStatus);
if (compileStatus == GL_FALSE) {
GLint infoLogLength = 0;
gl.GetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLogLength);
if (infoLogLength > 1) {
std::vector<char> buffer(infoLogLength);
gl.GetShaderInfoLog(shader, infoLogLength, nullptr, &buffer[0]);
dawn::ErrorLog() << source << "\nProgram compilation failed:\n"
<< buffer.data();
}
}
return shader;
};
mProgram = gl.CreateProgram();
// Compute the set of active stages.
wgpu::ShaderStage activeStages = wgpu::ShaderStage::None;
for (SingleShaderStage stage : IterateStages(kAllStages)) {
if (stages[stage].module != nullptr) {
activeStages |= StageBit(stage);
}
}
// Create an OpenGL shader for each stage and gather the list of combined samplers.
PerStage<CombinedSamplerInfo> combinedSamplers;
bool needsDummySampler = false;
for (SingleShaderStage stage : IterateStages(activeStages)) {
const ShaderModule* module = ToBackend(stages[stage].module.Get());
std::string glsl =
module->TranslateToGLSL(stages[stage].entryPoint.c_str(), stage,
&combinedSamplers[stage], layout, &needsDummySampler);
GLuint shader = CreateShader(gl, GLShaderType(stage), glsl.c_str());
gl.AttachShader(mProgram, shader);
}
if (needsDummySampler) {
SamplerDescriptor desc = {};
ASSERT(desc.minFilter == wgpu::FilterMode::Nearest);
ASSERT(desc.magFilter == wgpu::FilterMode::Nearest);
ASSERT(desc.mipmapFilter == wgpu::FilterMode::Nearest);
mDummySampler =
ToBackend(layout->GetDevice()->GetOrCreateSampler(&desc).AcquireSuccess());
}
// Link all the shaders together.
gl.LinkProgram(mProgram);
GLint linkStatus = GL_FALSE;
gl.GetProgramiv(mProgram, GL_LINK_STATUS, &linkStatus);
if (linkStatus == GL_FALSE) {
GLint infoLogLength = 0;
gl.GetProgramiv(mProgram, GL_INFO_LOG_LENGTH, &infoLogLength);
if (infoLogLength > 1) {
std::vector<char> buffer(infoLogLength);
gl.GetProgramInfoLog(mProgram, infoLogLength, nullptr, &buffer[0]);
dawn::ErrorLog() << "Program link failed:\n" << buffer.data();
}
}
// The uniforms are part of the program state so we can pre-bind buffer units, texture units
// etc.
gl.UseProgram(mProgram);
const auto& indices = layout->GetBindingIndexInfo();
for (BindGroupIndex group : IterateBitSet(layout->GetBindGroupLayoutsMask())) {
const BindGroupLayoutBase* bgl = layout->GetBindGroupLayout(group);
for (const auto& it : bgl->GetBindingMap()) {
BindingNumber bindingNumber = it.first;
BindingIndex bindingIndex = it.second;
std::string name = GetBindingName(group, bindingNumber);
const BindingInfo& bindingInfo = bgl->GetBindingInfo(bindingIndex);
switch (bindingInfo.bindingType) {
case BindingInfoType::Buffer:
switch (bindingInfo.buffer.type) {
case wgpu::BufferBindingType::Uniform: {
GLint location = gl.GetUniformBlockIndex(mProgram, name.c_str());
if (location != -1) {
gl.UniformBlockBinding(mProgram, location,
indices[group][bindingIndex]);
}
break;
}
case wgpu::BufferBindingType::Storage:
case wgpu::BufferBindingType::ReadOnlyStorage: {
// Since glShaderStorageBlockBinding doesn't exist in OpenGL ES, we
// skip that call and handle it during shader translation by
// modifying the location decoration. Contrary to all other binding
// types, OpenGL ES's SSBO binding index in the SSBO table is the
// value of the location= decoration in GLSL.
if (gl.GetVersion().IsDesktop()) {
GLuint location = gl.GetProgramResourceIndex(
mProgram, GL_SHADER_STORAGE_BLOCK, name.c_str());
if (location != GL_INVALID_INDEX) {
gl.ShaderStorageBlockBinding(mProgram, location,
indices[group][bindingIndex]);
}
}
break;
}
case wgpu::BufferBindingType::Undefined:
UNREACHABLE();
}
break;
case BindingInfoType::Sampler:
case BindingInfoType::Texture:
// These binding types are handled in the separate sampler and texture
// emulation
break;
case BindingInfoType::StorageTexture: {
if (gl.GetVersion().IsDesktop()) {
GLint location = gl.GetUniformLocation(mProgram, name.c_str());
if (location != -1) {
gl.Uniform1i(location, indices[group][bindingIndex]);
}
}
break;
}
}
}
}
// Compute links between stages for combined samplers, then bind them to texture units
{
std::set<CombinedSampler> combinedSamplersSet;
for (SingleShaderStage stage : IterateStages(activeStages)) {
for (const CombinedSampler& combined : combinedSamplers[stage]) {
combinedSamplersSet.insert(combined);
}
}
mUnitsForSamplers.resize(layout->GetNumSamplers());
mUnitsForTextures.resize(layout->GetNumSampledTextures());
GLuint textureUnit = layout->GetTextureUnitsUsed();
for (const auto& combined : combinedSamplersSet) {
std::string name = combined.GetName();
GLint location = gl.GetUniformLocation(mProgram, name.c_str());
if (location == -1) {
continue;
}
gl.Uniform1i(location, textureUnit);
bool shouldUseFiltering;
{
const BindGroupLayoutBase* bgl =
layout->GetBindGroupLayout(combined.textureLocation.group);
BindingIndex bindingIndex =
bgl->GetBindingIndex(combined.textureLocation.binding);
GLuint textureIndex = indices[combined.textureLocation.group][bindingIndex];
mUnitsForTextures[textureIndex].push_back(textureUnit);
shouldUseFiltering = bgl->GetBindingInfo(bindingIndex).texture.sampleType ==
wgpu::TextureSampleType::Float;
}
{
if (combined.useDummySampler) {
mDummySamplerUnits.push_back(textureUnit);
} else {
const BindGroupLayoutBase* bgl =
layout->GetBindGroupLayout(combined.samplerLocation.group);
BindingIndex bindingIndex =
bgl->GetBindingIndex(combined.samplerLocation.binding);
GLuint samplerIndex = indices[combined.samplerLocation.group][bindingIndex];
mUnitsForSamplers[samplerIndex].push_back(
{textureUnit, shouldUseFiltering});
}
}
textureUnit++;
}
}
}
const std::vector<PipelineGL::SamplerUnit>& PipelineGL::GetTextureUnitsForSampler(
GLuint index) const {
ASSERT(index < mUnitsForSamplers.size());
return mUnitsForSamplers[index];
}
const std::vector<GLuint>& PipelineGL::GetTextureUnitsForTextureView(GLuint index) const {
ASSERT(index < mUnitsForTextures.size());
return mUnitsForTextures[index];
}
GLuint PipelineGL::GetProgramHandle() const {
return mProgram;
}
void PipelineGL::ApplyNow(const OpenGLFunctions& gl) {
gl.UseProgram(mProgram);
for (GLuint unit : mDummySamplerUnits) {
ASSERT(mDummySampler.Get() != nullptr);
gl.BindSampler(unit, mDummySampler->GetNonFilteringHandle());
}
}
}} // namespace dawn_native::opengl