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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gl/GrGLShaderBuilder.h"
#include "gl/GrGLProgram.h"
namespace {
// number of each input/output type in a single allocation block
static const int sVarsPerBlock = 8;
// except FS outputs where we expect 2 at most.
static const int sMaxFSOutputs = 2;
}
// Architectural assumption: always 2-d input coords.
// Likely to become non-constant and non-static, perhaps even
// varying by stage, if we use 1D textures for gradients!
//const int GrGLShaderBuilder::fCoordDims = 2;
GrGLShaderBuilder::GrGLShaderBuilder()
: fVSUnis(sVarsPerBlock)
, fVSAttrs(sVarsPerBlock)
, fVSOutputs(sVarsPerBlock)
, fGSInputs(sVarsPerBlock)
, fGSOutputs(sVarsPerBlock)
, fFSInputs(sVarsPerBlock)
, fFSUnis(sVarsPerBlock)
, fFSOutputs(sMaxFSOutputs)
, fUsesGS(false)
, fVaryingDims(0)
, fSamplerMode(kDefault_SamplerMode)
, fComplexCoord(false) {
}
void GrGLShaderBuilder::computeSwizzle(uint32_t configFlags) {
static const uint32_t kMulByAlphaMask =
(GrGLProgram::StageDesc::kMulRGBByAlpha_RoundUp_InConfigFlag |
GrGLProgram::StageDesc::kMulRGBByAlpha_RoundDown_InConfigFlag);
fSwizzle = "";
if (configFlags & GrGLProgram::StageDesc::kSwapRAndB_InConfigFlag) {
GrAssert(!(configFlags &
GrGLProgram::StageDesc::kSmearAlpha_InConfigFlag));
GrAssert(!(configFlags &
GrGLProgram::StageDesc::kSmearRed_InConfigFlag));
fSwizzle = ".bgra";
} else if (configFlags & GrGLProgram::StageDesc::kSmearAlpha_InConfigFlag) {
GrAssert(!(configFlags & kMulByAlphaMask));
GrAssert(!(configFlags &
GrGLProgram::StageDesc::kSmearRed_InConfigFlag));
fSwizzle = ".aaaa";
} else if (configFlags & GrGLProgram::StageDesc::kSmearRed_InConfigFlag) {
GrAssert(!(configFlags & kMulByAlphaMask));
GrAssert(!(configFlags &
GrGLProgram::StageDesc::kSmearAlpha_InConfigFlag));
fSwizzle = ".rrrr";
}
}
void GrGLShaderBuilder::computeModulate(const char* fsInColor) {
if (NULL != fsInColor) {
fModulate.printf(" * %s", fsInColor);
} else {
fModulate.reset();
}
}
void GrGLShaderBuilder::emitTextureSetup() {
GrStringBuilder retval;
switch (fSamplerMode) {
case kDefault_SamplerMode:
// Fall through
case kProj_SamplerMode:
// Do nothing
break;
case kExplicitDivide_SamplerMode:
retval = "inCoord";
fFSCode.appendf("\t %s %s = %s%s / %s%s\n",
GrGLShaderVar::TypeString
(GrSLFloatVectorType(fCoordDims)),
retval.c_str(),
fSampleCoords.c_str(),
GrGLSLVectorNonhomogCoords(fVaryingDims),
fSampleCoords.c_str(),
GrGLSLVectorHomogCoord(fVaryingDims));
fSampleCoords = retval;
break;
}
}
void GrGLShaderBuilder::emitTextureLookup(const char* samplerName,
const char* coordName) {
if (NULL == coordName) {
coordName = fSampleCoords.c_str();
}
switch (fSamplerMode) {
default:
SkDEBUGFAIL("Unknown sampler mode");
// Fall through
case kDefault_SamplerMode:
// Fall through
case kExplicitDivide_SamplerMode:
fFSCode.appendf("texture2D(%s, %s)", samplerName, coordName);
break;
case kProj_SamplerMode:
fFSCode.appendf("texture2DProj(%s, %s)", samplerName, coordName);
break;
}
}
void GrGLShaderBuilder::emitDefaultFetch(const char* outColor,
const char* samplerName) {
fFSCode.appendf("\t%s = ", outColor);
this->emitTextureLookup(samplerName);
fFSCode.appendf("%s%s;\n", fSwizzle.c_str(), fModulate.c_str());
}
const GrGLShaderVar& GrGLShaderBuilder::addUniform(VariableLifetime lifetime,
GrSLType type,
const char* name,
int stageNum,
int count) {
GrAssert(name && strlen(name));
GrGLShaderVar* var = NULL;
if (kVertex_VariableLifetime & lifetime) {
var = &fVSUnis.push_back();
} else {
GrAssert(kFragment_VariableLifetime & lifetime);
var = &fFSUnis.push_back();
}
var->setType(type);
var->setTypeModifier(GrGLShaderVar::kUniform_TypeModifier);
var->setName(name);
if (stageNum >= 0) {
var->accessName()->appendS32(stageNum);
}
var->setArrayCount(count);
if ((kVertex_VariableLifetime |
kFragment_VariableLifetime) == lifetime) {
fFSUnis.push_back(*var);
// If it's shared between VS and FS, VS must override
// default highp and specify mediump.
var->setEmitPrecision(true);
}
return *var;
}
void GrGLShaderBuilder::addVarying(GrSLType type,
const char* name,
const char** vsOutName,
const char** fsInName) {
fVSOutputs.push_back();
fVSOutputs.back().setType(type);
fVSOutputs.back().setTypeModifier(GrGLShaderVar::kOut_TypeModifier);
fVSOutputs.back().accessName()->printf("v%s", name);
if (vsOutName) {
*vsOutName = fVSOutputs.back().getName().c_str();
}
// input to FS comes either from VS or GS
const GrStringBuilder* fsName;
if (fUsesGS) {
// if we have a GS take each varying in as an array
// and output as non-array.
fGSInputs.push_back();
fGSInputs.back().setType(type);
fGSInputs.back().setTypeModifier(GrGLShaderVar::kIn_TypeModifier);
fGSInputs.back().setUnsizedArray();
*fGSInputs.back().accessName() = fVSOutputs.back().getName();
fGSOutputs.push_back();
fGSOutputs.back().setType(type);
fGSOutputs.back().setTypeModifier(GrGLShaderVar::kOut_TypeModifier);
fGSOutputs.back().accessName()->printf("g%s", name);
fsName = fGSOutputs.back().accessName();
} else {
fsName = fVSOutputs.back().accessName();
}
fFSInputs.push_back();
fFSInputs.back().setType(type);
fFSInputs.back().setTypeModifier(GrGLShaderVar::kIn_TypeModifier);
fFSInputs.back().setName(*fsName);
if (fsInName) {
*fsInName = fsName->c_str();
}
}
void GrGLShaderBuilder::addVarying(GrSLType type,
const char* name,
int stageNum,
const char** vsOutName,
const char** fsInName) {
GrStringBuilder nameWithStage(name);
nameWithStage.appendS32(stageNum);
this->addVarying(type, nameWithStage.c_str(), vsOutName, fsInName);
}
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