kc3-lang/angle/src/libANGLE/renderer/vulkan/TransformFeedbackVk.h

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• Hash : 959037e0
  Author :
  Date : 2020-05-25T15:40:38
  

  Vulkan: Preserve RPs on XFB changes when possible.
  
  Instead of unconditonally ending the RenderPass we keep a set of
  active XFB buffers in the ContextVk. This lets us re-use RPs when
  we don't write to the same buffer repeatedly.
  
  Reduces the RenderPass count in our Manhattan capture from 29->23.
  
  Bug: angleproject:4622
  Change-Id: I28c2d4d3db1490e5d07be3c48d21fd2cc6ff85d6
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2196957
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  Reviewed-by: Charlie Lao <cclao@google.com>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/vulkan/TransformFeedbackVk.h

• //
  // Copyright 2016 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // TransformFeedbackVk.h:
  //    Defines the class interface for TransformFeedbackVk, implementing TransformFeedbackImpl.
  //
  
  #ifndef LIBANGLE_RENDERER_VULKAN_TRANSFORMFEEDBACKVK_H_
  #define LIBANGLE_RENDERER_VULKAN_TRANSFORMFEEDBACKVK_H_
  
  #include "libANGLE/renderer/TransformFeedbackImpl.h"
  
  #include "libANGLE/renderer/glslang_wrapper_utils.h"
  #include "libANGLE/renderer/vulkan/vk_helpers.h"
  
  namespace gl
  {
  class ProgramState;
  }  // namespace gl
  
  namespace rx
  {
  namespace vk
  {
  class DescriptorSetLayoutDesc;
  }
  
  class TransformFeedbackVk : public TransformFeedbackImpl
  {
    public:
      TransformFeedbackVk(const gl::TransformFeedbackState &state);
      ~TransformFeedbackVk() override;
      void onDestroy(const gl::Context *context) override;
  
      angle::Result begin(const gl::Context *context, gl::PrimitiveMode primitiveMode) override;
      angle::Result end(const gl::Context *context) override;
      angle::Result pause(const gl::Context *context) override;
      angle::Result resume(const gl::Context *context) override;
  
      angle::Result bindIndexedBuffer(const gl::Context *context,
                                      size_t index,
                                      const gl::OffsetBindingPointer<gl::Buffer> &binding) override;
  
      void updateDescriptorSetLayout(ContextVk *contextVk,
                                     ShaderInterfaceVariableInfoMap &vsVariableInfoMap,
                                     size_t xfbBufferCount,
                                     vk::DescriptorSetLayoutDesc *descSetLayoutOut) const;
      void initDescriptorSet(ContextVk *contextVk,
                             size_t xfbBufferCount,
                             vk::BufferHelper *emptyBuffer,
                             VkDescriptorSet descSet) const;
      void updateDescriptorSet(ContextVk *contextVk,
                               const gl::ProgramState &programState,
                               VkDescriptorSet descSet) const;
      void getBufferOffsets(ContextVk *contextVk,
                            GLint drawCallFirstVertex,
                            int32_t *offsetsOut,
                            size_t offsetsSize) const;
  
      bool getAndResetBufferRebindState()
      {
          bool retVal                    = mRebindTransformFeedbackBuffer;
          mRebindTransformFeedbackBuffer = false;
          return retVal;
      }
  
      const gl::TransformFeedbackBuffersArray<vk::BufferHelper *> &getBufferHelpers() const
      {
          return mBufferHelpers;
      }
  
      const gl::TransformFeedbackBuffersArray<VkBuffer> &getBufferHandles() const
      {
          return mBufferHandles;
      }
  
      const gl::TransformFeedbackBuffersArray<VkDeviceSize> &getBufferOffsets() const
      {
          return mBufferOffsets;
      }
  
      const gl::TransformFeedbackBuffersArray<VkDeviceSize> &getBufferSizes() const
      {
          return mBufferSizes;
      }
  
      const gl::TransformFeedbackBuffersArray<VkBuffer> &getCounterBufferHandles() const
      {
          return mCounterBufferHandles;
      }
  
    private:
      void writeDescriptorSet(ContextVk *contextVk,
                              size_t xfbBufferCount,
                              VkDescriptorBufferInfo *pBufferInfo,
                              VkDescriptorSet descSet) const;
  
      // This member variable is set when glBindTransformFeedbackBuffers/glBeginTransformFeedback
      // is called and unset in dirty bit handler for transform feedback state change. If this
      // value is true, vertex shader will record transform feedback varyings from the beginning
      // of the buffer.
      bool mRebindTransformFeedbackBuffer;
  
      gl::TransformFeedbackBuffersArray<vk::BufferHelper *> mBufferHelpers;
      gl::TransformFeedbackBuffersArray<VkBuffer> mBufferHandles;
      gl::TransformFeedbackBuffersArray<VkDeviceSize> mBufferOffsets;
      gl::TransformFeedbackBuffersArray<VkDeviceSize> mBufferSizes;
  
      // Aligned offset for emulation. Could be smaller than offset.
      gl::TransformFeedbackBuffersArray<VkDeviceSize> mAlignedBufferOffsets;
  
      // Counter buffer used for pause and resume.
      gl::TransformFeedbackBuffersArray<vk::BufferHelper> mCounterBufferHelpers;
      gl::TransformFeedbackBuffersArray<VkBuffer> mCounterBufferHandles;
  };
  
  }  // namespace rx
  
  #endif  // LIBANGLE_RENDERER_VULKAN_TRANSFORMFEEDBACKVK_H_
  

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