| /* |
| * 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 |
| } |
| } |
| |
| const char* GrGetGLSLVarPrecisionDeclType(GrGLBinding binding) { |
| if (kES2_GrGLBinding == binding) { |
| return "mediump"; |
| } else { |
| return " "; |
| } |
| } |
| |
| const char* GrGetGLSLShaderPrecisionDecl(GrGLBinding binding) { |
| if (kES2_GrGLBinding == binding) { |
| return "precision mediump float;\n"; |
| } else { |
| return ""; |
| } |
| } |
| |
| bool GrGLSLSetupFSColorOuput(GrGLSLGeneration gen, |
| const char* nameIfDeclared, |
| GrGLShaderVar* var) { |
| bool declaredOutput = k110_GrGLSLGeneration != gen; |
| var->set(GrGLShaderVar::kVec4f_Type, |
| GrGLShaderVar::kOut_TypeModifier, |
| declaredOutput ? nameIfDeclared : "gl_FragColor"); |
| return declaredOutput; |
| } |