Move GLSL-specific routines/classes to separate glsl directory

src/gpu/gl/GrGLSL.cpp

-/*
- * 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"
-
-bool GrGetGLSLGeneration(const GrGLInterface* gl, GrGLSLGeneration* generation) {
-    SkASSERT(generation);
-    GrGLSLVersion ver = GrGLGetGLSLVersion(gl);
-    if (GR_GLSL_INVALID_VER == ver) {
-        return false;
-    }
-    switch (gl->fStandard) {
-        case kGL_GrGLStandard:
-            SkASSERT(ver >= GR_GLSL_VER(1,10));
-            if (ver >= GR_GLSL_VER(3,30)) {
-                *generation = k330_GrGLSLGeneration;
-            } else if (ver >= GR_GLSL_VER(1,50)) {
-                *generation = k150_GrGLSLGeneration;
-            } else if (ver >= GR_GLSL_VER(1,40)) {
-                *generation = k140_GrGLSLGeneration;
-            } else if (ver >= GR_GLSL_VER(1,30)) {
-                *generation = k130_GrGLSLGeneration;
-            } else {
-                *generation = k110_GrGLSLGeneration;
-            }
-            return true;
-        case kGLES_GrGLStandard:
-            SkASSERT(ver >= GR_GL_VER(1,00));
-            if (ver >= GR_GLSL_VER(3,1)) {
-                *generation = k310es_GrGLSLGeneration;
-            }
-            else if (ver >= GR_GLSL_VER(3,0)) {
-                *generation = k330_GrGLSLGeneration;
-            } else {
-                *generation = k110_GrGLSLGeneration;
-            }
-            return true;
-        default:
-            SkFAIL("Unknown GL Standard");
-            return false;
-    }
-}
-
-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";
-            }
-        case k330_GrGLSLGeneration:
-            if (kGLES_GrGLStandard == info.standard()) {
-                return "#version 300 es\n";
-            } else {
-                SkASSERT(kGL_GrGLStandard == info.standard());
-                if (info.caps()->isCoreProfile()) {
-                    return "#version 330\n";
-                } else {
-                    return "#version 330 compatibility\n";
-                }
-            }
-        case k310es_GrGLSLGeneration:
-            SkASSERT(kGLES_GrGLStandard == info.standard());
-            return "#version 310 es\n";
-    }
-    return "<no version>";
-}
-
-bool GrGLSLSupportsNamedFragmentShaderOutputs(GrGLSLGeneration gen) {
-    switch (gen) {
-        case k110_GrGLSLGeneration:
-            return false;
-        case k130_GrGLSLGeneration:
-        case k140_GrGLSLGeneration:
-        case k150_GrGLSLGeneration:
-        case k330_GrGLSLGeneration:
-        case k310es_GrGLSLGeneration:
-            return true;
-    }
-    return false;
-}
-
-void GrGLSLAppendDefaultFloatPrecisionDeclaration(GrSLPrecision p, GrGLStandard s, SkString* out) {
-    // Desktop GLSL has added precision qualifiers but they don't do anything.
-    if (kGLES_GrGLStandard == s) {
-        switch (p) {
-            case kHigh_GrSLPrecision:
-                out->append("precision highp float;\n");
-                break;
-            case kMedium_GrSLPrecision:
-                out->append("precision mediump float;\n");
-                break;
-            case kLow_GrSLPrecision:
-                out->append("precision lowp float;\n");
-                break;
-            default:
-                SkFAIL("Unknown precision value.");
-        }
-    }
-}
-
-void GrGLSLMulVarBy4f(SkString* outAppend, const char* vec4VarName, const GrGLSLExpr4& mulFactor) {
-    if (mulFactor.isOnes()) {
-        *outAppend = SkString();
-    }
-
-    if (mulFactor.isZeros()) {
-        outAppend->appendf("%s = vec4(0);", vec4VarName);
-    } else {
-        outAppend->appendf("%s *= %s;", vec4VarName, mulFactor.c_str());
-    }
-}