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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.
*/
#include "GrGLSL.h"
#include "GrGLShaderVar.h"
#include "SkString.h"
GrGLSLGeneration GrGetGLSLGeneration(GrGLBinding binding, const GrGLInterface* gl) {
GrGLSLVersion ver = GrGLGetGLSLVersion(gl);
switch (binding) {
case kDesktop_GrGLBinding:
GrAssert(ver >= GR_GLSL_VER(1,10));
if (ver >= GR_GLSL_VER(1,50)) {
return k150_GrGLSLGeneration;
} else if (ver >= GR_GLSL_VER(1,40)) {
return k140_GrGLSLGeneration;
} else if (ver >= GR_GLSL_VER(1,30)) {
return k130_GrGLSLGeneration;
} else {
return k110_GrGLSLGeneration;
}
case kES2_GrGLBinding:
// version 1.00 of ES GLSL based on ver 1.20 of desktop GLSL
GrAssert(ver >= GR_GL_VER(1,00));
return k110_GrGLSLGeneration;
default:
GrCrash("Unknown GL Binding");
return k110_GrGLSLGeneration; // suppress warning
}
}
const char* GrGetGLSLVersionDecl(GrGLBinding binding, GrGLSLGeneration gen) {
switch (gen) {
case k110_GrGLSLGeneration:
if (kES2_GrGLBinding == binding) {
// ES2s shader language is based on version 1.20 but is version
// 1.00 of the ES language.
return "#version 100\n";
} else {
GrAssert(kDesktop_GrGLBinding == binding);
return "#version 110\n";
}
case k130_GrGLSLGeneration:
GrAssert(kDesktop_GrGLBinding == binding);
return "#version 130\n";
case k140_GrGLSLGeneration:
GrAssert(kDesktop_GrGLBinding == binding);
return "#version 140\n";
case k150_GrGLSLGeneration:
GrAssert(kDesktop_GrGLBinding == binding);
return "#version 150\n";
default:
GrCrash("Unknown GL version.");
return ""; // suppress warning
}
}
bool GrGLSLSetupFSColorOuput(GrGLSLGeneration gen, const char* nameIfDeclared, GrGLShaderVar* var) {
bool declaredOutput = k110_GrGLSLGeneration != gen;
var->set(kVec4f_GrSLType,
GrGLShaderVar::kOut_TypeModifier,
declaredOutput ? nameIfDeclared : "gl_FragColor");
return declaredOutput;
}
const char* GrGLSLVectorHomogCoord(int count) {
static const char* HOMOGS[] = {"ERROR", "", ".y", ".z", ".w"};
GrAssert(count >= 1 && count < (int)GR_ARRAY_COUNT(HOMOGS));
return HOMOGS[count];
}
const char* GrGLSLVectorHomogCoord(GrSLType type) {
return GrGLSLVectorHomogCoord(GrSLTypeToVecLength(type));
}
const char* GrGLSLVectorNonhomogCoords(int count) {
static const char* NONHOMOGS[] = {"ERROR", "", ".x", ".xy", ".xyz"};
GrAssert(count >= 1 && count < (int)GR_ARRAY_COUNT(NONHOMOGS));
return NONHOMOGS[count];
}
const char* GrGLSLVectorNonhomogCoords(GrSLType type) {
return GrGLSLVectorNonhomogCoords(GrSLTypeToVecLength(type));
}
namespace {
void append_tabs(SkString* outAppend, int tabCnt) {
static const char kTabs[] = "\t\t\t\t\t\t\t\t";
while (tabCnt) {
int cnt = GrMin((int)GR_ARRAY_COUNT(kTabs), tabCnt);
outAppend->append(kTabs, cnt);
tabCnt -= cnt;
}
}
}
GrSLConstantVec GrGLSLMulVarBy4f(SkString* outAppend,
int tabCnt,
const char* vec4VarName,
const char* mulFactor,
GrSLConstantVec mulFactorDefault) {
bool haveFactor = NULL != mulFactor && '\0' != *mulFactor;
GrAssert(NULL != outAppend);
GrAssert(NULL != vec4VarName);
GrAssert(kNone_GrSLConstantVec != mulFactorDefault || haveFactor);
if (!haveFactor) {
if (kOnes_GrSLConstantVec == mulFactorDefault) {
return kNone_GrSLConstantVec;
} else {
GrAssert(kZeros_GrSLConstantVec == mulFactorDefault);
append_tabs(outAppend, tabCnt);
outAppend->appendf("%s = vec4(0, 0, 0, 0);\n", vec4VarName);
return kZeros_GrSLConstantVec;
}
}
append_tabs(outAppend, tabCnt);
outAppend->appendf("%s *= %s;\n", vec4VarName, mulFactor);
return kNone_GrSLConstantVec;
}
GrSLConstantVec GrGLSLGetComponent4f(SkString* outAppend,
const char* expr,
GrColorComponentFlags component,
GrSLConstantVec defaultExpr,
bool omitIfConst) {
if (NULL == expr || '\0' == *expr) {
GrAssert(defaultExpr != kNone_GrSLConstantVec);
if (!omitIfConst) {
if (kOnes_GrSLConstantVec == defaultExpr) {
outAppend->append("1.0");
} else {
GrAssert(kZeros_GrSLConstantVec == defaultExpr);
outAppend->append("0.0");
}
}
return defaultExpr;
} else {
outAppend->appendf("(%s).%c", expr, GrColorComponentFlagToChar(component));
return kNone_GrSLConstantVec;
}
}
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