| // 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/RenderPipelineGL.h" |
| |
| #include "dawn_native/opengl/DeviceGL.h" |
| #include "dawn_native/opengl/Forward.h" |
| #include "dawn_native/opengl/PersistentPipelineStateGL.h" |
| #include "dawn_native/opengl/UtilsGL.h" |
| |
| namespace dawn_native { namespace opengl { |
| |
| namespace { |
| |
| GLenum GLPrimitiveTopology(wgpu::PrimitiveTopology primitiveTopology) { |
| switch (primitiveTopology) { |
| case wgpu::PrimitiveTopology::PointList: |
| return GL_POINTS; |
| case wgpu::PrimitiveTopology::LineList: |
| return GL_LINES; |
| case wgpu::PrimitiveTopology::LineStrip: |
| return GL_LINE_STRIP; |
| case wgpu::PrimitiveTopology::TriangleList: |
| return GL_TRIANGLES; |
| case wgpu::PrimitiveTopology::TriangleStrip: |
| return GL_TRIANGLE_STRIP; |
| } |
| } |
| |
| void ApplyFrontFaceAndCulling(const OpenGLFunctions& gl, |
| wgpu::FrontFace face, |
| wgpu::CullMode mode) { |
| // Note that we invert winding direction in OpenGL. Because Y axis is up in OpenGL, |
| // which is different from WebGPU and other backends (Y axis is down). |
| GLenum direction = (face == wgpu::FrontFace::CCW) ? GL_CW : GL_CCW; |
| gl.FrontFace(direction); |
| |
| if (mode == wgpu::CullMode::None) { |
| gl.Disable(GL_CULL_FACE); |
| } else { |
| gl.Enable(GL_CULL_FACE); |
| |
| GLenum cullMode = (mode == wgpu::CullMode::Front) ? GL_FRONT : GL_BACK; |
| gl.CullFace(cullMode); |
| } |
| } |
| |
| GLenum GLBlendFactor(wgpu::BlendFactor factor, bool alpha) { |
| switch (factor) { |
| case wgpu::BlendFactor::Zero: |
| return GL_ZERO; |
| case wgpu::BlendFactor::One: |
| return GL_ONE; |
| case wgpu::BlendFactor::SrcColor: |
| return GL_SRC_COLOR; |
| case wgpu::BlendFactor::OneMinusSrcColor: |
| return GL_ONE_MINUS_SRC_COLOR; |
| case wgpu::BlendFactor::SrcAlpha: |
| return GL_SRC_ALPHA; |
| case wgpu::BlendFactor::OneMinusSrcAlpha: |
| return GL_ONE_MINUS_SRC_ALPHA; |
| case wgpu::BlendFactor::DstColor: |
| return GL_DST_COLOR; |
| case wgpu::BlendFactor::OneMinusDstColor: |
| return GL_ONE_MINUS_DST_COLOR; |
| case wgpu::BlendFactor::DstAlpha: |
| return GL_DST_ALPHA; |
| case wgpu::BlendFactor::OneMinusDstAlpha: |
| return GL_ONE_MINUS_DST_ALPHA; |
| case wgpu::BlendFactor::SrcAlphaSaturated: |
| return GL_SRC_ALPHA_SATURATE; |
| case wgpu::BlendFactor::BlendColor: |
| return alpha ? GL_CONSTANT_ALPHA : GL_CONSTANT_COLOR; |
| case wgpu::BlendFactor::OneMinusBlendColor: |
| return alpha ? GL_ONE_MINUS_CONSTANT_ALPHA : GL_ONE_MINUS_CONSTANT_COLOR; |
| } |
| } |
| |
| GLenum GLBlendMode(wgpu::BlendOperation operation) { |
| switch (operation) { |
| case wgpu::BlendOperation::Add: |
| return GL_FUNC_ADD; |
| case wgpu::BlendOperation::Subtract: |
| return GL_FUNC_SUBTRACT; |
| case wgpu::BlendOperation::ReverseSubtract: |
| return GL_FUNC_REVERSE_SUBTRACT; |
| case wgpu::BlendOperation::Min: |
| return GL_MIN; |
| case wgpu::BlendOperation::Max: |
| return GL_MAX; |
| } |
| } |
| |
| void ApplyColorState(const OpenGLFunctions& gl, |
| ColorAttachmentIndex attachment, |
| const ColorStateDescriptor* descriptor) { |
| GLuint colorBuffer = static_cast<GLuint>(static_cast<uint8_t>(attachment)); |
| if (BlendEnabled(descriptor)) { |
| gl.Enablei(GL_BLEND, colorBuffer); |
| gl.BlendEquationSeparatei(colorBuffer, |
| GLBlendMode(descriptor->colorBlend.operation), |
| GLBlendMode(descriptor->alphaBlend.operation)); |
| gl.BlendFuncSeparatei(colorBuffer, |
| GLBlendFactor(descriptor->colorBlend.srcFactor, false), |
| GLBlendFactor(descriptor->colorBlend.dstFactor, false), |
| GLBlendFactor(descriptor->alphaBlend.srcFactor, true), |
| GLBlendFactor(descriptor->alphaBlend.dstFactor, true)); |
| } else { |
| gl.Disablei(GL_BLEND, colorBuffer); |
| } |
| gl.ColorMaski(colorBuffer, descriptor->writeMask & wgpu::ColorWriteMask::Red, |
| descriptor->writeMask & wgpu::ColorWriteMask::Green, |
| descriptor->writeMask & wgpu::ColorWriteMask::Blue, |
| descriptor->writeMask & wgpu::ColorWriteMask::Alpha); |
| } |
| |
| GLuint OpenGLStencilOperation(wgpu::StencilOperation stencilOperation) { |
| switch (stencilOperation) { |
| case wgpu::StencilOperation::Keep: |
| return GL_KEEP; |
| case wgpu::StencilOperation::Zero: |
| return GL_ZERO; |
| case wgpu::StencilOperation::Replace: |
| return GL_REPLACE; |
| case wgpu::StencilOperation::Invert: |
| return GL_INVERT; |
| case wgpu::StencilOperation::IncrementClamp: |
| return GL_INCR; |
| case wgpu::StencilOperation::DecrementClamp: |
| return GL_DECR; |
| case wgpu::StencilOperation::IncrementWrap: |
| return GL_INCR_WRAP; |
| case wgpu::StencilOperation::DecrementWrap: |
| return GL_DECR_WRAP; |
| } |
| } |
| |
| void ApplyDepthStencilState(const OpenGLFunctions& gl, |
| const DepthStencilStateDescriptor* descriptor, |
| PersistentPipelineState* persistentPipelineState) { |
| // Depth writes only occur if depth is enabled |
| if (descriptor->depthCompare == wgpu::CompareFunction::Always && |
| !descriptor->depthWriteEnabled) { |
| gl.Disable(GL_DEPTH_TEST); |
| } else { |
| gl.Enable(GL_DEPTH_TEST); |
| } |
| |
| if (descriptor->depthWriteEnabled) { |
| gl.DepthMask(GL_TRUE); |
| } else { |
| gl.DepthMask(GL_FALSE); |
| } |
| |
| gl.DepthFunc(ToOpenGLCompareFunction(descriptor->depthCompare)); |
| |
| if (StencilTestEnabled(descriptor)) { |
| gl.Enable(GL_STENCIL_TEST); |
| } else { |
| gl.Disable(GL_STENCIL_TEST); |
| } |
| |
| GLenum backCompareFunction = ToOpenGLCompareFunction(descriptor->stencilBack.compare); |
| GLenum frontCompareFunction = ToOpenGLCompareFunction(descriptor->stencilFront.compare); |
| persistentPipelineState->SetStencilFuncsAndMask( |
| gl, backCompareFunction, frontCompareFunction, descriptor->stencilReadMask); |
| |
| gl.StencilOpSeparate(GL_BACK, OpenGLStencilOperation(descriptor->stencilBack.failOp), |
| OpenGLStencilOperation(descriptor->stencilBack.depthFailOp), |
| OpenGLStencilOperation(descriptor->stencilBack.passOp)); |
| gl.StencilOpSeparate(GL_FRONT, OpenGLStencilOperation(descriptor->stencilFront.failOp), |
| OpenGLStencilOperation(descriptor->stencilFront.depthFailOp), |
| OpenGLStencilOperation(descriptor->stencilFront.passOp)); |
| |
| gl.StencilMask(descriptor->stencilWriteMask); |
| } |
| |
| } // anonymous namespace |
| |
| RenderPipeline::RenderPipeline(Device* device, const RenderPipelineDescriptor* descriptor) |
| : RenderPipelineBase(device, descriptor), |
| mVertexArrayObject(0), |
| mGlPrimitiveTopology(GLPrimitiveTopology(GetPrimitiveTopology())) { |
| PerStage<const ShaderModule*> modules(nullptr); |
| modules[SingleShaderStage::Vertex] = ToBackend(descriptor->vertexStage.module); |
| modules[SingleShaderStage::Fragment] = ToBackend(descriptor->fragmentStage->module); |
| |
| PipelineGL::Initialize(device->gl, ToBackend(GetLayout()), GetAllStages()); |
| CreateVAOForVertexState(descriptor->vertexState); |
| } |
| |
| RenderPipeline::~RenderPipeline() { |
| const OpenGLFunctions& gl = ToBackend(GetDevice())->gl; |
| gl.DeleteVertexArrays(1, &mVertexArrayObject); |
| gl.BindVertexArray(0); |
| } |
| |
| GLenum RenderPipeline::GetGLPrimitiveTopology() const { |
| return mGlPrimitiveTopology; |
| } |
| |
| ityp::bitset<VertexAttributeLocation, kMaxVertexAttributes> |
| RenderPipeline::GetAttributesUsingVertexBuffer(VertexBufferSlot slot) const { |
| ASSERT(!IsError()); |
| return mAttributesUsingVertexBuffer[slot]; |
| } |
| |
| void RenderPipeline::CreateVAOForVertexState(const VertexStateDescriptor* vertexState) { |
| const OpenGLFunctions& gl = ToBackend(GetDevice())->gl; |
| |
| gl.GenVertexArrays(1, &mVertexArrayObject); |
| gl.BindVertexArray(mVertexArrayObject); |
| |
| for (VertexAttributeLocation location : IterateBitSet(GetAttributeLocationsUsed())) { |
| const auto& attribute = GetAttribute(location); |
| GLuint glAttrib = static_cast<GLuint>(static_cast<uint8_t>(location)); |
| gl.EnableVertexAttribArray(glAttrib); |
| |
| mAttributesUsingVertexBuffer[attribute.vertexBufferSlot][location] = true; |
| const VertexBufferInfo& vertexBuffer = GetVertexBuffer(attribute.vertexBufferSlot); |
| |
| if (vertexBuffer.arrayStride == 0) { |
| // Emulate a stride of zero (constant vertex attribute) by |
| // setting the attribute instance divisor to a huge number. |
| gl.VertexAttribDivisor(glAttrib, 0xffffffff); |
| } else { |
| switch (vertexBuffer.stepMode) { |
| case wgpu::InputStepMode::Vertex: |
| break; |
| case wgpu::InputStepMode::Instance: |
| gl.VertexAttribDivisor(glAttrib, 1); |
| break; |
| } |
| } |
| } |
| } |
| |
| void RenderPipeline::ApplyNow(PersistentPipelineState& persistentPipelineState) { |
| const OpenGLFunctions& gl = ToBackend(GetDevice())->gl; |
| PipelineGL::ApplyNow(gl); |
| |
| ASSERT(mVertexArrayObject); |
| gl.BindVertexArray(mVertexArrayObject); |
| |
| ApplyFrontFaceAndCulling(gl, GetFrontFace(), GetCullMode()); |
| |
| ApplyDepthStencilState(gl, GetDepthStencilStateDescriptor(), &persistentPipelineState); |
| |
| gl.SampleMaski(0, GetSampleMask()); |
| if (IsAlphaToCoverageEnabled()) { |
| gl.Enable(GL_SAMPLE_ALPHA_TO_COVERAGE); |
| } else { |
| gl.Disable(GL_SAMPLE_ALPHA_TO_COVERAGE); |
| } |
| |
| if (IsDepthBiasEnabled()) { |
| gl.Enable(GL_POLYGON_OFFSET_FILL); |
| float depthBias = GetDepthBias(); |
| float slopeScale = GetDepthBiasSlopeScale(); |
| if (gl.PolygonOffsetClamp != nullptr) { |
| gl.PolygonOffsetClamp(slopeScale, depthBias, GetDepthBiasClamp()); |
| } else { |
| gl.PolygonOffset(slopeScale, depthBias); |
| } |
| } else { |
| gl.Disable(GL_POLYGON_OFFSET_FILL); |
| } |
| |
| for (ColorAttachmentIndex attachmentSlot : IterateBitSet(GetColorAttachmentsMask())) { |
| ApplyColorState(gl, attachmentSlot, GetColorStateDescriptor(attachmentSlot)); |
| } |
| } |
| |
| }} // namespace dawn_native::opengl |
