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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrGLShaderBuilder.h"
#include "GrGLProgramBuilder.h"
#include "../GrGpuGL.h"
#include "../GrGLShaderVar.h"
namespace {
inline const char* sample_function_name(GrSLType type, GrGLSLGeneration glslGen) {
if (kVec2f_GrSLType == type) {
return glslGen >= k130_GrGLSLGeneration ? "texture" : "texture2D";
} else {
SkASSERT(kVec3f_GrSLType == type);
return glslGen >= k130_GrGLSLGeneration ? "textureProj" : "texture2DProj";
}
}
void append_texture_lookup(SkString* out,
GrGpuGL* gpu,
const char* samplerName,
const char* coordName,
uint32_t configComponentMask,
const char* swizzle,
GrSLType varyingType = kVec2f_GrSLType) {
SkASSERT(NULL != coordName);
out->appendf("%s(%s, %s)",
sample_function_name(varyingType, gpu->glslGeneration()),
samplerName,
coordName);
char mangledSwizzle[5];
// The swizzling occurs using texture params instead of shader-mangling if ARB_texture_swizzle
// is available.
if (!gpu->glCaps().textureSwizzleSupport() &&
(kA_GrColorComponentFlag == configComponentMask)) {
char alphaChar = gpu->glCaps().textureRedSupport() ? 'r' : 'a';
int i;
for (i = 0; '\0' != swizzle[i]; ++i) {
mangledSwizzle[i] = alphaChar;
}
mangledSwizzle[i] ='\0';
swizzle = mangledSwizzle;
}
// For shader prettiness we omit the swizzle rather than appending ".rgba".
if (memcmp(swizzle, "rgba", 4)) {
out->appendf(".%s", swizzle);
}
}
static const int kVarsPerBlock = 8;
}
GrGLShaderBuilder::GrGLShaderBuilder(GrGLProgramBuilder* program)
: fProgramBuilder(program)
, fInputs(kVarsPerBlock)
, fOutputs(kVarsPerBlock)
, fFeaturesAddedMask(0) {
}
void GrGLShaderBuilder::emitFunction(GrSLType returnType,
const char* name,
int argCnt,
const GrGLShaderVar* args,
const char* body,
SkString* outName) {
fFunctions.append(GrGLSLTypeString(returnType));
fProgramBuilder->nameVariable(outName, '\0', name);
fFunctions.appendf(" %s", outName->c_str());
fFunctions.append("(");
const GrGLContextInfo& ctxInfo = fProgramBuilder->gpu()->ctxInfo();
for (int i = 0; i < argCnt; ++i) {
args[i].appendDecl(ctxInfo, &fFunctions);
if (i < argCnt - 1) {
fFunctions.append(", ");
}
}
fFunctions.append(") {\n");
fFunctions.append(body);
fFunctions.append("}\n\n");
}
void GrGLShaderBuilder::appendTextureLookup(SkString* out,
const TextureSampler& sampler,
const char* coordName,
GrSLType varyingType) const {
append_texture_lookup(out,
fProgramBuilder->gpu(),
fProgramBuilder->getUniformCStr(sampler.samplerUniform()),
coordName,
sampler.configComponentMask(),
sampler.swizzle(),
varyingType);
}
void GrGLShaderBuilder::appendTextureLookup(const TextureSampler& sampler,
const char* coordName,
GrSLType varyingType) {
this->appendTextureLookup(&fCode, sampler, coordName, varyingType);
}
void GrGLShaderBuilder::appendTextureLookupAndModulate(const char* modulation,
const TextureSampler& sampler,
const char* coordName,
GrSLType varyingType) {
SkString lookup;
this->appendTextureLookup(&lookup, sampler, coordName, varyingType);
this->codeAppend((GrGLSLExpr4(modulation) * GrGLSLExpr4(lookup)).c_str());
}
const GrGLenum* GrGLShaderBuilder::GetTexParamSwizzle(GrPixelConfig config, const GrGLCaps& caps) {
if (caps.textureSwizzleSupport() && GrPixelConfigIsAlphaOnly(config)) {
if (caps.textureRedSupport()) {
static const GrGLenum gRedSmear[] = { GR_GL_RED, GR_GL_RED, GR_GL_RED, GR_GL_RED };
return gRedSmear;
} else {
static const GrGLenum gAlphaSmear[] = { GR_GL_ALPHA, GR_GL_ALPHA,
GR_GL_ALPHA, GR_GL_ALPHA };
return gAlphaSmear;
}
} else {
static const GrGLenum gStraight[] = { GR_GL_RED, GR_GL_GREEN, GR_GL_BLUE, GR_GL_ALPHA };
return gStraight;
}
}
void GrGLShaderBuilder::addFeature(uint32_t featureBit, const char* extensionName) {
if (!(featureBit & fFeaturesAddedMask)) {
fExtensions.appendf("#extension %s: require\n", extensionName);
fFeaturesAddedMask |= featureBit;
}
}
void GrGLShaderBuilder::appendTextureLookup(const char* samplerName,
const char* coordName,
uint32_t configComponentMask,
const char* swizzle) {
append_texture_lookup(&fCode,
fProgramBuilder->gpu(),
samplerName,
coordName,
configComponentMask,
swizzle,
kVec2f_GrSLType);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
GrGLFullShaderBuilder::GrGLFullShaderBuilder(GrGLFullProgramBuilder* program)
: INHERITED(program)
, fFullProgramBuilder(program) {}
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