src/third_party/skia/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp

   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 "../GrGpuGL.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 SkString& shaderSrc,
  24                                     GrContext::GPUStats* gpuStats) {
  25     const GrGLInterface* gli = glCtx.interface();
  26
  27     GrGLuint shaderId;
  28     GR_GL_CALL_RET(gli, shaderId, CreateShader(type));
  29     if (0 == shaderId) {
  30         return 0;
  31     }
  32
  33 #ifdef SK_DEBUG
  34     SkString prettySource = GrGLSLPrettyPrint::PrettyPrintGLSL(shaderSrc, false);
  35     const GrGLchar* sourceStr = prettySource.c_str();
  36     GrGLint sourceLength = static_cast<GrGLint>(prettySource.size());
  37 #else
  38     GrGLint sourceLength = static_cast<GrGLint>(shaderSrc.size());
  39     const GrGLchar* sourceStr = shaderSrc.c_str();
  40 #endif
  41     GR_GL_CALL(gli, ShaderSource(shaderId, 1, &sourceStr, &sourceLength));
  42     gpuStats->incShaderCompilations();
  43     GR_GL_CALL(gli, CompileShader(shaderId));
  44
  45     // Calling GetShaderiv in Chromium is quite expensive. Assume success in release builds.
  46     bool checkCompiled = !glCtx.isChromium();
  47 #ifdef SK_DEBUG
  48     checkCompiled = true;
  49 #endif
  50     if (checkCompiled) {
  51         GrGLint compiled = GR_GL_INIT_ZERO;
  52         GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_COMPILE_STATUS, &compiled));
  53
  54         if (!compiled) {
  55             GrGLint infoLen = GR_GL_INIT_ZERO;
  56             GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_INFO_LOG_LENGTH, &infoLen));
  57             SkAutoMalloc log(sizeof(char)*(infoLen+1)); // outside if for debugger
  58             if (infoLen > 0) {
  59                 // retrieve length even though we don't need it to workaround bug in Chromium cmd
  60                 // buffer param validation.
  61                 GrGLsizei length = GR_GL_INIT_ZERO;
  62                 GR_GL_CALL(gli, GetShaderInfoLog(shaderId, infoLen+1,
  63                                                  &length, (char*)log.get()));
  64                 GrPrintf(GrGLSLPrettyPrint::PrettyPrintGLSL(shaderSrc, true).c_str());
  65                 GrPrintf("\n%s", log.get());
  66             }
  67             SkDEBUGFAIL("Shader compilation failed!");
  68             GR_GL_CALL(gli, DeleteShader(shaderId));
  69             return 0;
  70         }
  71     }
  72
  73     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "skia_gpu::GLShader",
  74                          TRACE_EVENT_SCOPE_THREAD, "shader", TRACE_STR_COPY(shaderSrc.c_str()));
  75     if (c_PrintShaders) {
  76         GrPrintf(GrGLSLPrettyPrint::PrettyPrintGLSL(shaderSrc, true).c_str());
  77         GrPrintf("\n");
  78     }
  79
  80     // Attach the shader, but defer deletion until after we have linked the program.
  81     // This works around a bug in the Android emulator's GLES2 wrapper which
  82     // will immediately delete the shader object and free its memory even though it's
  83     // attached to a program, which then causes glLinkProgram to fail.
  84     GR_GL_CALL(gli, AttachShader(programId, shaderId));
  85
  86     return shaderId;
  87 }