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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"
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(1,30)) {
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 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;
}
GrSLType GrSLFloatVectorType (int count) {
GR_STATIC_ASSERT(kFloat_GrSLType == 1);
GR_STATIC_ASSERT(kVec2f_GrSLType == 2);
GR_STATIC_ASSERT(kVec3f_GrSLType == 3);
GR_STATIC_ASSERT(kVec4f_GrSLType == 4);
GrAssert(count > 0 && count <= 4);
return (GrSLType)(count);
}
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* GrGLSLVectorNonhomogCoords(int count) {
static const char* NONHOMOGS[] = {"ERROR", "", ".x", ".xy", ".xyz"};
GrAssert(count >= 1 && count < (int)GR_ARRAY_COUNT(NONHOMOGS));
return NONHOMOGS[count];
}
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