1 /* 2 * Copyright 2014 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 "GrGLShaderStringBuilder.h" 9 #include "gl/GrGLGpu.h" 10 #include "gl/GrGLSLPrettyPrint.h" 11 #include "SkRTConf.h" 12 #include "SkTraceEvent.h" 13 14 #define GL_CALL(X) GR_GL_CALL(gpu->glInterface(), X) 15 #define GL_CALL_RET(R, X) GR_GL_CALL_RET(gpu->glInterface(), R, X) 16 17 SK_CONF_DECLARE(bool, c_PrintShaders, "gpu.printShaders", false, 18 "Print the source code for all shaders generated."); 19 20 GrGLuint GrGLCompileAndAttachShader(const GrGLContext& glCtx, 21 GrGLuint programId, 22 GrGLenum type, 23 const char** strings, 24 int* lengths, 25 int count, 26 GrGpu::Stats* stats) { 27 const GrGLInterface* gli = glCtx.interface(); 28 29 GrGLuint shaderId; 30 GR_GL_CALL_RET(gli, shaderId, CreateShader(type)); 31 if (0 == shaderId) { 32 return 0; 33 } 34 35 #ifdef SK_DEBUG 36 SkString prettySource = GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, false); 37 const GrGLchar* sourceStr = prettySource.c_str(); 38 GrGLint sourceLength = static_cast<GrGLint>(prettySource.size()); 39 GR_GL_CALL(gli, ShaderSource(shaderId, 1, &sourceStr, &sourceLength)); 40 #else 41 GR_GL_CALL(gli, ShaderSource(shaderId, count, strings, lengths)); 42 #endif 43 44 // If tracing is enabled in chrome then we pretty print 45 bool traceShader; 46 TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), &traceShader); 47 if (traceShader) { 48 SkString shader = GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, false); 49 TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "skia_gpu::GLShader", 50 TRACE_EVENT_SCOPE_THREAD, "shader", TRACE_STR_COPY(shader.c_str())); 51 } 52 53 stats->incShaderCompilations(); 54 GR_GL_CALL(gli, CompileShader(shaderId)); 55 56 // Calling GetShaderiv in Chromium is quite expensive. Assume success in release builds. 57 bool checkCompiled = kChromium_GrGLDriver != glCtx.driver(); 58 #ifdef SK_DEBUG 59 checkCompiled = true; 60 #endif 61 if (checkCompiled) { 62 GrGLint compiled = GR_GL_INIT_ZERO; 63 GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_COMPILE_STATUS, &compiled)); 64 65 if (!compiled) { 66 GrGLint infoLen = GR_GL_INIT_ZERO; 67 GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_INFO_LOG_LENGTH, &infoLen)); 68 SkAutoMalloc log(sizeof(char)*(infoLen+1)); // outside if for debugger 69 if (infoLen > 0) { 70 // retrieve length even though we don't need it to workaround bug in Chromium cmd 71 // buffer param validation. 72 GrGLsizei length = GR_GL_INIT_ZERO; 73 GR_GL_CALL(gli, GetShaderInfoLog(shaderId, infoLen+1, &length, (char*)log.get())); 74 SkDebugf("%s", GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str()); 75 SkDebugf("\n%s", log.get()); 76 } 77 SkDEBUGFAIL("Shader compilation failed!"); 78 GR_GL_CALL(gli, DeleteShader(shaderId)); 79 return 0; 80 } 81 } 82 83 if (c_PrintShaders) { 84 SkDebugf("%s", GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str()); 85 SkDebugf("\n"); 86 } 87 88 // Attach the shader, but defer deletion until after we have linked the program. 89 // This works around a bug in the Android emulator's GLES2 wrapper which 90 // will immediately delete the shader object and free its memory even though it's 91 // attached to a program, which then causes glLinkProgram to fail. 92 GR_GL_CALL(gli, AttachShader(programId, shaderId)); 93 94 return shaderId; 95 } 96