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The Tor Browser
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TransformFeedback.h (4043B)

      1 //
      2 // Copyright 2014 The ANGLE Project Authors. All rights reserved.
      3 // Use of this source code is governed by a BSD-style license that can be
      4 // found in the LICENSE file.
      5 //
      6 
      7 #ifndef LIBANGLE_TRANSFORM_FEEDBACK_H_
      8 #define LIBANGLE_TRANSFORM_FEEDBACK_H_
      9 
     10 #include "libANGLE/RefCountObject.h"
     11 
     12 #include "common/PackedEnums.h"
     13 #include "common/angleutils.h"
     14 #include "libANGLE/Debug.h"
     15 
     16 #include "angle_gl.h"
     17 
     18 namespace rx
     19 {
     20 class GLImplFactory;
     21 class TransformFeedbackImpl;
     22 class TransformFeedbackGL;
     23 }  // namespace rx
     24 
     25 namespace gl
     26 {
     27 class Buffer;
     28 struct Caps;
     29 class Context;
     30 class Program;
     31 
     32 class TransformFeedbackState final : angle::NonCopyable
     33 {
     34  public:
     35    TransformFeedbackState(size_t maxIndexedBuffers);
     36    ~TransformFeedbackState();
     37 
     38    const OffsetBindingPointer<Buffer> &getIndexedBuffer(size_t idx) const;
     39    const std::vector<OffsetBindingPointer<Buffer>> &getIndexedBuffers() const;
     40    const Program *getBoundProgram() const { return mProgram; }
     41    GLsizeiptr getVerticesDrawn() const { return mVerticesDrawn; }
     42    GLsizeiptr getPrimitivesDrawn() const;
     43 
     44  private:
     45    friend class TransformFeedback;
     46 
     47    std::string mLabel;
     48 
     49    bool mActive;
     50    PrimitiveMode mPrimitiveMode;
     51    bool mPaused;
     52    GLsizeiptr mVerticesDrawn;
     53    GLsizeiptr mVertexCapacity;
     54 
     55    Program *mProgram;
     56 
     57    std::vector<OffsetBindingPointer<Buffer>> mIndexedBuffers;
     58 };
     59 
     60 class TransformFeedback final : public RefCountObject<TransformFeedbackID>, public LabeledObject
     61 {
     62  public:
     63    TransformFeedback(rx::GLImplFactory *implFactory, TransformFeedbackID id, const Caps &caps);
     64    ~TransformFeedback() override;
     65    void onDestroy(const Context *context) override;
     66 
     67    angle::Result setLabel(const Context *context, const std::string &label) override;
     68    const std::string &getLabel() const override;
     69 
     70    angle::Result begin(const Context *context, PrimitiveMode primitiveMode, Program *program);
     71    angle::Result end(const Context *context);
     72    angle::Result pause(const Context *context);
     73    angle::Result resume(const Context *context);
     74 
     75    bool isActive() const { return mState.mActive; }
     76 
     77    bool isPaused() const;
     78    PrimitiveMode getPrimitiveMode() const;
     79    // Validates that the vertices produced by a draw call will fit in the bound transform feedback
     80    // buffers.
     81    bool checkBufferSpaceForDraw(GLsizei count, GLsizei primcount) const;
     82    // This must be called after each draw call when transform feedback is enabled to keep track of
     83    // how many vertices have been written to the buffers. This information is needed by
     84    // checkBufferSpaceForDraw because each draw call appends vertices to the buffers starting just
     85    // after the last vertex of the previous draw call.
     86    void onVerticesDrawn(const Context *context, GLsizei count, GLsizei primcount);
     87 
     88    bool hasBoundProgram(ShaderProgramID program) const;
     89 
     90    angle::Result bindIndexedBuffer(const Context *context,
     91                                    size_t index,
     92                                    Buffer *buffer,
     93                                    size_t offset,
     94                                    size_t size);
     95    const OffsetBindingPointer<Buffer> &getIndexedBuffer(size_t index) const;
     96    size_t getIndexedBufferCount() const;
     97    const std::vector<OffsetBindingPointer<Buffer>> &getIndexedBuffers() const;
     98 
     99    GLsizeiptr getVerticesDrawn() const { return mState.getVerticesDrawn(); }
    100    GLsizeiptr getPrimitivesDrawn() const { return mState.getPrimitivesDrawn(); }
    101 
    102    // Returns true if any buffer bound to this object is also bound to another target.
    103    bool buffersBoundForOtherUseInWebGL() const;
    104 
    105    angle::Result detachBuffer(const Context *context, BufferID bufferID);
    106 
    107    rx::TransformFeedbackImpl *getImplementation() const;
    108 
    109    void onBindingChanged(const Context *context, bool bound);
    110 
    111  private:
    112    void bindProgram(const Context *context, Program *program);
    113 
    114    TransformFeedbackState mState;
    115    rx::TransformFeedbackImpl *mImplementation;
    116 };
    117 
    118 }  // namespace gl
    119 
    120 #endif  // LIBANGLE_TRANSFORM_FEEDBACK_H_