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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 "GrDrawState.h"
#include "GrGLContext.h"
#include "GrGLProgramDesc.h"
#include "GrGLShaderBuilder.h"
#include "GrGLSL.h"
#include "GrGLTexture.h"
#include "GrGLUniformManager.h"
#include "SkString.h"
#include "SkXfermode.h"
class GrBinHashKeyBuilder;
class GrGLEffect;
class GrGLProgramEffects;
class GrGLShaderBuilder;
/**
* This class manages a GPU program and records per-program information.
* We can specify the attribute locations so that they are constant
* across our shaders. But the driver determines the uniform locations
* at link time. We don't need to remember the sampler uniform location
* because we will bind a texture slot to it and never change it
* Uniforms are program-local so we can't rely on fHWState to hold the
* previous uniform state after a program change.
*/
class GrGLProgram : public SkRefCnt {
public:
SK_DECLARE_INST_COUNT(GrGLProgram)
static GrGLProgram* Create(GrGpuGL* gpu,
const GrGLProgramDesc& desc,
const GrEffectStage* colorStages[],
const GrEffectStage* coverageStages[]);
virtual ~GrGLProgram();
/**
* Call to abandon GL objects owned by this program.
*/
void abandon();
/**
* The shader may modify the blend coefficients. Params are in/out.
*/
void overrideBlend(GrBlendCoeff* srcCoeff, GrBlendCoeff* dstCoeff) const;
const GrGLProgramDesc& getDesc() { return fDesc; }
/**
* Gets the GL program ID for this program.
*/
GrGLuint programID() const { return fBuilderOutput.fProgramID; }
bool hasVertexShader() const { return fBuilderOutput.fHasVertexShader; }
/**
* Some GL state that is relevant to programs is not stored per-program. In particular color
* and coverage attributes can be global state. This struct is read and updated by
* GrGLProgram::setColor and GrGLProgram::setCoverage to allow us to avoid setting this state
* redundantly.
*/
struct SharedGLState {
GrColor fConstAttribColor;
int fConstAttribColorIndex;
GrColor fConstAttribCoverage;
int fConstAttribCoverageIndex;
SharedGLState() { this->invalidate(); }
void invalidate() {
fConstAttribColor = GrColor_ILLEGAL;
fConstAttribColorIndex = -1;
fConstAttribCoverage = GrColor_ILLEGAL;
fConstAttribCoverageIndex = -1;
}
};
/**
* The GrDrawState's view matrix along with the aspects of the render target determine the
* matrix sent to GL. The size of the render target affects the GL matrix because we must
* convert from Skia device coords to GL's normalized coords. Also the origin of the render
* target may require us to perform a mirror-flip.
*/
struct MatrixState {
SkMatrix fViewMatrix;
SkISize fRenderTargetSize;
GrSurfaceOrigin fRenderTargetOrigin;
MatrixState() { this->invalidate(); }
void invalidate() {
fViewMatrix = SkMatrix::InvalidMatrix();
fRenderTargetSize.fWidth = -1;
fRenderTargetSize.fHeight = -1;
fRenderTargetOrigin = (GrSurfaceOrigin) -1;
}
/**
* Gets a matrix that goes from local coords to Skia's device coordinates.
*/
template<int Size> void getGLMatrix(GrGLfloat* destMatrix) {
GrGLGetMatrix<Size>(destMatrix, fViewMatrix);
}
/**
* Gets a matrix that goes from local coordinates to GL normalized device coords.
*/
template<int Size> void getRTAdjustedGLMatrix(GrGLfloat* destMatrix) {
SkMatrix combined;
if (kBottomLeft_GrSurfaceOrigin == fRenderTargetOrigin) {
combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1,
0, -SkIntToScalar(2) / fRenderTargetSize.fHeight, SK_Scalar1,
0, 0, 1);
} else {
combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1,
0, SkIntToScalar(2) / fRenderTargetSize.fHeight, -SK_Scalar1,
0, 0, 1);
}
combined.preConcat(fViewMatrix);
GrGLGetMatrix<Size>(destMatrix, combined);
}
/**
* Gets a vec4 that adjusts the position from Skia device coords to GL's normalized device
* coords. Assuming the transformed position, pos, is a homogeneous vec3, the vec, v, is
* applied as such:
* pos.x = dot(v.xy, pos.xz)
* pos.y = dot(v.zq, pos.yz)
*/
void getRTAdjustmentVec(GrGLfloat* 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 and calls each GrGLEffect's setData. It is called before a
* draw occurs using the program after the program has already been bound. It also uses the
* GrGpuGL object to bind the textures required by the GrGLEffects. The color and coverage
* stages come from GrGLProgramDesc::Build().
*/
void setData(GrDrawState::BlendOptFlags,
const GrEffectStage* colorStages[],
const GrEffectStage* coverageStages[],
const GrDeviceCoordTexture* dstCopy, // can be NULL
SharedGLState*);
private:
typedef GrGLUniformManager::UniformHandle UniformHandle;
GrGLProgram(GrGpuGL*,
const GrGLProgramDesc&,
GrGLUniformManager*,
const GrGLShaderBuilder::GenProgramOutput&);
// Sets the texture units for samplers.
void initSamplerUniforms();
// Helper for setData(). Makes GL calls to specify the initial color when there is not
// per-vertex colors.
void setColor(const GrDrawState&, GrColor color, SharedGLState*);
// Helper for setData(). Makes GL calls to specify the initial coverage when there is not
// per-vertex coverages.
void setCoverage(const GrDrawState&, GrColor coverage, SharedGLState*);
// Helper for setData() that sets the view matrix and loads the render target height uniform
void setMatrixAndRenderTargetHeight(const GrDrawState&);
// these reflect the current values of uniforms (GL uniform values travel with program)
MatrixState fMatrixState;
GrColor fColor;
GrColor fCoverage;
int fDstCopyTexUnit;
GrGLShaderBuilder::GenProgramOutput fBuilderOutput;
GrGLProgramDesc fDesc;
GrGpuGL* fGpu;
SkAutoTUnref<GrGLUniformManager> fUniformManager;
typedef SkRefCnt INHERITED;
};
#endif