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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLProgram_DEFINED
#define GrGLProgram_DEFINED
#include "GrGLProgramDataManager.h"
#include "glsl/GrGLSLProgramDataManager.h"
#include "glsl/GrGLSLUniformHandler.h"
class GrGLSLFragmentProcessor;
class GrGLSLPrimitiveProcessor;
class GrGLSLXferProcessor;
class GrPipeline;
class GrPrimitiveProcessor;
class GrRenderTargetProxy;
/**
* This class manages a GPU program and records per-program information. It also records the vertex
* and instance attribute layouts that are to be used with the program.
*/
class GrGLProgram : public SkRefCnt {
public:
/**
* This class has its own Attribute representation as it does not need the name and we don't
* want to worry about copying the name string to memory with life time of GrGLProgram.
* Additionally, these store the attribute location.
*/
struct Attribute {
GrVertexAttribType fType;
size_t fOffset;
GrGLint fLocation;
};
using UniformHandle = GrGLSLProgramDataManager::UniformHandle;
using UniformInfoArray = GrGLProgramDataManager::UniformInfoArray;
using VaryingInfoArray = GrGLProgramDataManager::VaryingInfoArray;
/**
* The attribute array consists of vertexAttributeCnt + instanceAttributeCnt elements with
* the vertex attributes preceding the instance attributes.
*/
GrGLProgram(GrGLGpu*,
const GrGLSLBuiltinUniformHandles&,
GrGLuint programID,
const UniformInfoArray& uniforms,
const UniformInfoArray& textureSamplers,
const VaryingInfoArray&, // used for NVPR only currently
std::unique_ptr<GrGLSLPrimitiveProcessor> geometryProcessor,
std::unique_ptr<GrGLSLXferProcessor> xferProcessor,
std::unique_ptr<std::unique_ptr<GrGLSLFragmentProcessor>[]> fragmentProcessors,
int fragmentProcessorCnt,
std::unique_ptr<Attribute[]>,
int vertexAttributeCnt,
int instanceAttributeCnt,
int vertexStride,
int instanceStride);
~GrGLProgram();
/**
* Call to abandon GL objects owned by this program.
*/
void abandon();
/**
* Gets the GL program ID for this program.
*/
GrGLuint programID() const { return fProgramID; }
/**
* We use the RT's size and origin to adjust from Skia device space to OpenGL normalized device
* space and to make device space positions have the correct origin for processors that require
* them.
*/
struct RenderTargetState {
SkISize fRenderTargetSize;
GrSurfaceOrigin fRenderTargetOrigin;
RenderTargetState() { this->invalidate(); }
void invalidate() {
fRenderTargetSize.fWidth = -1;
fRenderTargetSize.fHeight = -1;
fRenderTargetOrigin = (GrSurfaceOrigin) -1;
}
/**
* Gets a float4 that adjusts the position from Skia device coords to GL's normalized device
* coords. Assuming the transformed position, pos, is a homogeneous float3, the vec, v, is
* applied as such:
* pos.x = dot(v.xy, pos.xz)
* pos.y = dot(v.zw, pos.yz)
*/
void getRTAdjustmentVec(float* destVec) {
destVec[0] = 2.f / fRenderTargetSize.fWidth;
destVec[1] = -1.f;
if (kBottomLeft_GrSurfaceOrigin == fRenderTargetOrigin) {
destVec[2] = -2.f / fRenderTargetSize.fHeight;
destVec[3] = 1.f;
} else {
destVec[2] = 2.f / fRenderTargetSize.fHeight;
destVec[3] = -1.f;
}
}
};
/**
* This function uploads uniforms, calls each GrGL*Processor's setData, and retrieves the
* textures that need to be bound on each unit. It is the caller's responsibility to ensure
* the program is bound before calling, and to bind the outgoing textures to their respective
* units upon return. (Each index in the array corresponds to its matching GL texture unit.)
*/
void setData(const GrPrimitiveProcessor&, const GrPipeline&);
/**
* This function retrieves the textures that need to be used by each GrGL*Processor, and
* ensures that any textures requiring mipmaps have their mipmaps correctly built.
*/
void generateMipmaps(const GrPrimitiveProcessor&, const GrPipeline&);
int vertexStride() const { return fVertexStride; }
int instanceStride() const { return fInstanceStride; }
int numVertexAttributes() const { return fVertexAttributeCnt; }
const Attribute& vertexAttribute(int i) const {
SkASSERT(i >= 0 && i < fVertexAttributeCnt);
return fAttributes[i];
}
int numInstanceAttributes() const { return fInstanceAttributeCnt; }
const Attribute& instanceAttribute(int i) const {
SkASSERT(i >= 0 && i < fInstanceAttributeCnt);
return fAttributes[i + fVertexAttributeCnt];
}
private:
// A helper to loop over effects, set the transforms (via subclass) and bind textures
void setFragmentData(const GrPipeline&, int* nextTexSamplerIdx);
// Helper for setData() that sets the view matrix and loads the render target height uniform
void setRenderTargetState(const GrPrimitiveProcessor&, const GrRenderTargetProxy*);
// these reflect the current values of uniforms (GL uniform values travel with program)
RenderTargetState fRenderTargetState;
GrGLSLBuiltinUniformHandles fBuiltinUniformHandles;
GrGLuint fProgramID;
// the installed effects
std::unique_ptr<GrGLSLPrimitiveProcessor> fPrimitiveProcessor;
std::unique_ptr<GrGLSLXferProcessor> fXferProcessor;
std::unique_ptr<std::unique_ptr<GrGLSLFragmentProcessor>[]> fFragmentProcessors;
int fFragmentProcessorCnt;
std::unique_ptr<Attribute[]> fAttributes;
int fVertexAttributeCnt;
int fInstanceAttributeCnt;
int fVertexStride;
int fInstanceStride;
GrGLGpu* fGpu;
GrGLProgramDataManager fProgramDataManager;
int fNumTextureSamplers;
typedef SkRefCnt INHERITED;
};
#endif
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