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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(const GrGLInterface* gl) {
GrGLSLVersion ver = GrGLGetGLSLVersion(gl);
switch (gl->fStandard) {
case kGL_GrGLStandard:
SkASSERT(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 kGLES_GrGLStandard:
// version 1.00 of ES GLSL based on ver 1.20 of desktop GLSL
SkASSERT(ver >= GR_GL_VER(1,00));
return k110_GrGLSLGeneration;
default:
GrCrash("Unknown GL Standard");
return k110_GrGLSLGeneration; // suppress warning
}
}
const char* GrGetGLSLVersionDecl(const GrGLContextInfo& info) {
switch (info.glslGeneration()) {
case k110_GrGLSLGeneration:
if (kGLES_GrGLStandard == info.standard()) {
// ES2s shader language is based on version 1.20 but is version
// 1.00 of the ES language.
return "#version 100\n";
} else {
SkASSERT(kGL_GrGLStandard == info.standard());
return "#version 110\n";
}
case k130_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == info.standard());
return "#version 130\n";
case k140_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == info.standard());
return "#version 140\n";
case k150_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == info.standard());
if (info.caps()->isCoreProfile()) {
return "#version 150\n";
} else {
return "#version 150 compatibility\n";
}
default:
GrCrash("Unknown GL version.");
return ""; // suppress warning
}
}
namespace {
void append_tabs(SkString* outAppend, int tabCnt) {
static const char kTabs[] = "\t\t\t\t\t\t\t\t";
while (tabCnt) {
int cnt = SkTMin((int)SK_ARRAY_COUNT(kTabs), tabCnt);
outAppend->append(kTabs, cnt);
tabCnt -= cnt;
}
}
}
void GrGLSLMulVarBy4f(SkString* outAppend,
unsigned tabCnt,
const char* vec4VarName,
const GrGLSLExpr4& mulFactor) {
if (mulFactor.isOnes()) {
*outAppend = SkString();
}
append_tabs(outAppend, tabCnt);
if (mulFactor.isZeros()) {
outAppend->appendf("%s = vec4(0);\n", vec4VarName);
} else {
outAppend->appendf("%s *= %s;\n", vec4VarName, mulFactor.c_str());
}
}
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