Initial refactor of shaderbuilder

src/gpu/gl/builders/GrGLShaderStringBuilder.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLShaderStringBuilder.h"
+#include "../GrGpuGL.h"
+#include "gl/GrGLSLPrettyPrint.h"
+#include "SkRTConf.h"
+#include "SkTraceEvent.h"
+
+#define GL_CALL(X) GR_GL_CALL(gpu->glInterface(), X)
+#define GL_CALL_RET(R, X) GR_GL_CALL_RET(gpu->glInterface(), R, X)
+
+SK_CONF_DECLARE(bool, c_PrintShaders, "gpu.printShaders", false,
+                "Print the source code for all shaders generated.");
+
+namespace GrGLShaderStringBuilder {
+GrGLuint attachShader(const GrGLContext& glCtx,
+                      GrGLuint programId,
+                      GrGLenum type,
+                      const SkString& shaderSrc) {
+    const GrGLInterface* gli = glCtx.interface();
+
+     GrGLuint shaderId;
+     GR_GL_CALL_RET(gli, shaderId, CreateShader(type));
+     if (0 == shaderId) {
+         return 0;
+     }
+
+ #ifdef SK_DEBUG
+     SkString prettySource = GrGLSLPrettyPrint::PrettyPrintGLSL(shaderSrc, false);
+     const GrGLchar* sourceStr = prettySource.c_str();
+     GrGLint sourceLength = static_cast<GrGLint>(prettySource.size());
+ #else
+     GrGLint sourceLength = static_cast<GrGLint>(shaderSrc.size());
+     const GrGLchar* sourceStr = shaderSrc.c_str();
+ #endif
+     GR_GL_CALL(gli, ShaderSource(shaderId, 1, &sourceStr, &sourceLength));
+     GR_GL_CALL(gli, CompileShader(shaderId));
+
+     // Calling GetShaderiv in Chromium is quite expensive. Assume success in release builds.
+     bool checkCompiled = !glCtx.isChromium();
+ #ifdef SK_DEBUG
+     checkCompiled = true;
+ #endif
+     if (checkCompiled) {
+         GrGLint compiled = GR_GL_INIT_ZERO;
+         GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_COMPILE_STATUS, &compiled));
+
+         if (!compiled) {
+             GrGLint infoLen = GR_GL_INIT_ZERO;
+             GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_INFO_LOG_LENGTH, &infoLen));
+             SkAutoMalloc log(sizeof(char)*(infoLen+1)); // outside if for debugger
+             if (infoLen > 0) {
+                 // retrieve length even though we don't need it to workaround bug in Chromium cmd
+                 // buffer param validation.
+                 GrGLsizei length = GR_GL_INIT_ZERO;
+                 GR_GL_CALL(gli, GetShaderInfoLog(shaderId, infoLen+1,
+                                                  &length, (char*)log.get()));
+                 GrPrintf(GrGLSLPrettyPrint::PrettyPrintGLSL(shaderSrc, true).c_str());
+                 GrPrintf("\n%s", log.get());
+             }
+             SkDEBUGFAIL("Shader compilation failed!");
+             GR_GL_CALL(gli, DeleteShader(shaderId));
+             return 0;
+         }
+     }
+
+     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "skia_gpu::GLShader",
+                          TRACE_EVENT_SCOPE_THREAD, "shader", TRACE_STR_COPY(shaderSrc.c_str()));
+     if (c_PrintShaders) {
+         GrPrintf(GrGLSLPrettyPrint::PrettyPrintGLSL(shaderSrc, true).c_str());
+         GrPrintf("\n");
+     }
+
+     // Attach the shader, but defer deletion until after we have linked the program.
+     // This works around a bug in the Android emulator's GLES2 wrapper which
+     // will immediately delete the shader object and free its memory even though it's
+     // attached to a program, which then causes glLinkProgram to fail.
+     GR_GL_CALL(gli, AttachShader(programId, shaderId));
+
+     return shaderId;
+}
+};