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

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• Hash : 0bfa5504
  Author :
  Date : 2019-06-03T10:40:10
  

  Vulkan: Emulate Transform Feedback with vertex shader output
  
  In ES 3.0 and 3.1, only non-indexed GL_POINTS, GL_LINES and GL_TRIANGLES
  is supported for transform feedback.  Without tessellation and geometry
  shaders, we can calculate the exact location where each vertex transform
  output should be written on the CPU, and have each vertex shader
  invocation write its data separately to the appropriate location in the
  buffer.
  
  This depends on the vertexPipelineStoresAndAtomics Vulkan feature.
  
  Bug: angleproject:3205
  Change-Id: I68ccbb80aece597cf20c557a0aee842360fea593
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1645678
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/vulkan/QueryVk.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.
  //
  // QueryVk.h:
  //    Defines the class interface for QueryVk, implementing QueryImpl.
  //
  
  #ifndef LIBANGLE_RENDERER_VULKAN_QUERYVK_H_
  #define LIBANGLE_RENDERER_VULKAN_QUERYVK_H_
  
  #include "libANGLE/renderer/QueryImpl.h"
  #include "libANGLE/renderer/vulkan/vk_helpers.h"
  
  namespace rx
  {
  class TransformFeedbackVk;
  
  class QueryVk : public QueryImpl
  {
    public:
      QueryVk(gl::QueryType type);
      ~QueryVk() override;
  
      void onDestroy(const gl::Context *context) override;
  
      angle::Result begin(const gl::Context *context) override;
      angle::Result end(const gl::Context *context) override;
      angle::Result queryCounter(const gl::Context *context) override;
      angle::Result getResult(const gl::Context *context, GLint *params) override;
      angle::Result getResult(const gl::Context *context, GLuint *params) override;
      angle::Result getResult(const gl::Context *context, GLint64 *params) override;
      angle::Result getResult(const gl::Context *context, GLuint64 *params) override;
      angle::Result isResultAvailable(const gl::Context *context, bool *available) override;
  
      void onTransformFeedbackEnd(const gl::Context *context);
  
    private:
      angle::Result getResult(const gl::Context *context, bool wait);
  
      // Used for AnySamples, AnySamplesConservative, Timestamp and TimeElapsed (end).
      vk::QueryHelper mQueryHelper;
      // An additional query used for TimeElapsed (begin), as it is implemented using Timestamp.
      vk::QueryHelper mQueryHelperTimeElapsedBegin;
      // Used with TransformFeedbackPrimitivesWritten when transform feedback is emulated.
      size_t mTransformFeedbackPrimitivesDrawn;
  
      uint64_t mCachedResult;
      bool mCachedResultValid;
  };
  
  }  // namespace rx
  
  #endif  // LIBANGLE_RENDERER_VULKAN_QUERYVK_H_
  

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