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//
// 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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