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; getBoundProgram()40 const Program *getBoundProgram() const { return mProgram; } getVerticesDrawn()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 void 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 isActive()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 getVerticesDrawn()99 GLsizeiptr getVerticesDrawn() const { return mState.getVerticesDrawn(); } getPrimitivesDrawn()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 buffersBoundForOtherUse() 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_ 121