kc3-lang/angle/src/libANGLE/TransformFeedback.h

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• Hash : fb3e2def
  Author :
  Date : 2022-05-24T15:47:01
  

  Extend labelObject functionality
  
  Modify interface to fully support labelObject return codes.
  Fix issues with texture implementation, including handling
  deferred Vulkan object creation.
  
  Bug: b/229105865
  Change-Id: I0c64b72dd0b54642fb643ee7f5ccbb2a134c6787
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3703184
  Commit-Queue: Ian Elliott <ianelliott@google.com>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Ian Elliott <ianelliott@google.com>
  

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• src/libANGLE/TransformFeedback.h

• //
  // Copyright 2014 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.
  //
  
  #ifndef LIBANGLE_TRANSFORM_FEEDBACK_H_
  #define LIBANGLE_TRANSFORM_FEEDBACK_H_
  
  #include "libANGLE/RefCountObject.h"
  
  #include "common/PackedEnums.h"
  #include "common/angleutils.h"
  #include "libANGLE/Debug.h"
  
  #include "angle_gl.h"
  
  namespace rx
  {
  class GLImplFactory;
  class TransformFeedbackImpl;
  class TransformFeedbackGL;
  }  // namespace rx
  
  namespace gl
  {
  class Buffer;
  struct Caps;
  class Context;
  class Program;
  
  class TransformFeedbackState final : angle::NonCopyable
  {
    public:
      TransformFeedbackState(size_t maxIndexedBuffers);
      ~TransformFeedbackState();
  
      const OffsetBindingPointer<Buffer> &getIndexedBuffer(size_t idx) const;
      const std::vector<OffsetBindingPointer<Buffer>> &getIndexedBuffers() const;
      const Program *getBoundProgram() const { return mProgram; }
      GLsizeiptr getVerticesDrawn() const { return mVerticesDrawn; }
      GLsizeiptr getPrimitivesDrawn() const;
  
    private:
      friend class TransformFeedback;
  
      std::string mLabel;
  
      bool mActive;
      PrimitiveMode mPrimitiveMode;
      bool mPaused;
      GLsizeiptr mVerticesDrawn;
      GLsizeiptr mVertexCapacity;
  
      Program *mProgram;
  
      std::vector<OffsetBindingPointer<Buffer>> mIndexedBuffers;
  };
  
  class TransformFeedback final : public RefCountObject<TransformFeedbackID>, public LabeledObject
  {
    public:
      TransformFeedback(rx::GLImplFactory *implFactory, TransformFeedbackID id, const Caps &caps);
      ~TransformFeedback() override;
      void onDestroy(const Context *context) override;
  
      angle::Result setLabel(const Context *context, const std::string &label) override;
      const std::string &getLabel() const override;
  
      angle::Result begin(const Context *context, PrimitiveMode primitiveMode, Program *program);
      angle::Result end(const Context *context);
      angle::Result pause(const Context *context);
      angle::Result resume(const Context *context);
  
      bool isActive() const { return mState.mActive; }
  
      bool isPaused() const;
      PrimitiveMode getPrimitiveMode() const;
      // Validates that the vertices produced by a draw call will fit in the bound transform feedback
      // buffers.
      bool checkBufferSpaceForDraw(GLsizei count, GLsizei primcount) const;
      // This must be called after each draw call when transform feedback is enabled to keep track of
      // how many vertices have been written to the buffers. This information is needed by
      // checkBufferSpaceForDraw because each draw call appends vertices to the buffers starting just
      // after the last vertex of the previous draw call.
      void onVerticesDrawn(const Context *context, GLsizei count, GLsizei primcount);
  
      bool hasBoundProgram(ShaderProgramID program) const;
  
      angle::Result bindIndexedBuffer(const Context *context,
                                      size_t index,
                                      Buffer *buffer,
                                      size_t offset,
                                      size_t size);
      const OffsetBindingPointer<Buffer> &getIndexedBuffer(size_t index) const;
      size_t getIndexedBufferCount() const;
      const std::vector<OffsetBindingPointer<Buffer>> &getIndexedBuffers() const;
  
      GLsizeiptr getVerticesDrawn() const { return mState.getVerticesDrawn(); }
      GLsizeiptr getPrimitivesDrawn() const { return mState.getPrimitivesDrawn(); }
  
      // Returns true if any buffer bound to this object is also bound to another target.
      bool buffersBoundForOtherUseInWebGL() const;
  
      angle::Result detachBuffer(const Context *context, BufferID bufferID);
  
      rx::TransformFeedbackImpl *getImplementation() const;
  
      void onBindingChanged(const Context *context, bool bound);
  
    private:
      void bindProgram(const Context *context, Program *program);
  
      TransformFeedbackState mState;
      rx::TransformFeedbackImpl *mImplementation;
  };
  
  }  // namespace gl
  
  #endif  // LIBANGLE_TRANSFORM_FEEDBACK_H_
  

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