1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "GrGLSL.h" 9 #include "GrGLShaderVar.h" 10 11 GrGLSLGeneration GrGetGLSLGeneration(GrGLBinding binding, 12 const GrGLInterface* gl) { 13 GrGLSLVersion ver = GrGLGetGLSLVersion(gl); 14 switch (binding) { 15 case kDesktop_GrGLBinding: 16 GrAssert(ver >= GR_GLSL_VER(1,10)); 17 if (ver >= GR_GLSL_VER(1,50)) { 18 return k150_GrGLSLGeneration; 19 } else if (ver >= GR_GLSL_VER(1,30)) { 20 return k130_GrGLSLGeneration; 21 } else { 22 return k110_GrGLSLGeneration; 23 } 24 case kES2_GrGLBinding: 25 // version 1.00 of ES GLSL based on ver 1.20 of desktop GLSL 26 GrAssert(ver >= GR_GL_VER(1,00)); 27 return k110_GrGLSLGeneration; 28 default: 29 GrCrash("Unknown GL Binding"); 30 return k110_GrGLSLGeneration; // suppress warning 31 } 32 } 33 34 const char* GrGetGLSLVersionDecl(GrGLBinding binding, 35 GrGLSLGeneration gen) { 36 switch (gen) { 37 case k110_GrGLSLGeneration: 38 if (kES2_GrGLBinding == binding) { 39 // ES2s shader language is based on version 1.20 but is version 40 // 1.00 of the ES language. 41 return "#version 100\n"; 42 } else { 43 GrAssert(kDesktop_GrGLBinding == binding); 44 return "#version 110\n"; 45 } 46 case k130_GrGLSLGeneration: 47 GrAssert(kDesktop_GrGLBinding == binding); 48 return "#version 130\n"; 49 case k150_GrGLSLGeneration: 50 GrAssert(kDesktop_GrGLBinding == binding); 51 return "#version 150\n"; 52 default: 53 GrCrash("Unknown GL version."); 54 return ""; // suppress warning 55 } 56 } 57 58 const char* GrGetGLSLVarPrecisionDeclType(GrGLBinding binding) { 59 if (kES2_GrGLBinding == binding) { 60 return "mediump"; 61 } else { 62 return " "; 63 } 64 } 65 66 const char* GrGetGLSLShaderPrecisionDecl(GrGLBinding binding) { 67 if (kES2_GrGLBinding == binding) { 68 return "precision mediump float;\n"; 69 } else { 70 return ""; 71 } 72 } 73 74 bool GrGLSLSetupFSColorOuput(GrGLSLGeneration gen, 75 const char* nameIfDeclared, 76 GrGLShaderVar* var) { 77 bool declaredOutput = k110_GrGLSLGeneration != gen; 78 var->set(GrGLShaderVar::kVec4f_Type, 79 GrGLShaderVar::kOut_TypeModifier, 80 declaredOutput ? nameIfDeclared : "gl_FragColor"); 81 return declaredOutput; 82 } 83