Refactored OpenGL embedder that works on Android, Mac or Linux.

runtime/embedders/openglui/common/gl_graphics_handler.cc

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "embedders/openglui/common/gl_graphics_handler.h"
+#include "embedders/openglui/common/log.h"
+
+extern void CheckGLError(const char *function);
+
+void GLGraphicsHandler::SetViewport(int left, int top, int width, int height) {
+  glViewport(left, top, width, height);
+  CheckGLError("glViewPort");
+}
+
+int GLGraphicsHandler::BuildProgram(const char* vertexShaderSource,
+                                 const char* fragmentShaderSource) const {
+  int vertexShader = BuildShader(vertexShaderSource, GL_VERTEX_SHADER);
+  int fragmentShader = BuildShader(fragmentShaderSource, GL_FRAGMENT_SHADER);
+  if (vertexShader < 0 || fragmentShader < 0) {
+    return -1;
+  }
+
+  GLuint programHandle = glCreateProgram();
+  glAttachShader(programHandle, static_cast<GLuint>(vertexShader));
+  glAttachShader(programHandle, static_cast<GLuint>(fragmentShader));
+  glLinkProgram(programHandle);
+
+  GLint linkSuccess;
+  glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
+  if (linkSuccess == GL_FALSE) {
+    GLint infoLogLength;
+    glGetProgramiv(programHandle, GL_INFO_LOG_LENGTH, &infoLogLength);
+    GLchar* strInfoLog = new GLchar[infoLogLength + 1];
+    glGetProgramInfoLog(programHandle, infoLogLength, NULL, strInfoLog);
+    strInfoLog[infoLogLength] = 0;
+    LOGE("Link failed: %s", strInfoLog);
+    delete[] strInfoLog;
+    return -1;
+  }
+  return static_cast<int>(programHandle);
+}
+
+int GLGraphicsHandler::BuildShader(const char* source,
+                                   GLenum shaderType) const {
+  GLuint shaderHandle = glCreateShader(shaderType);
+  glShaderSource(shaderHandle, 1, &source, NULL);
+  glCompileShader(shaderHandle);
+
+  GLint compileSuccess;
+  glGetShaderiv(shaderHandle, GL_COMPILE_STATUS, &compileSuccess);
+
+  if (compileSuccess == GL_FALSE) {
+    GLint infoLogLength = 0;
+    glGetShaderiv(shaderHandle, GL_INFO_LOG_LENGTH, &infoLogLength);
+    GLchar* strInfoLog = new GLchar[infoLogLength + 1];
+    glGetShaderInfoLog(shaderHandle, infoLogLength, NULL, strInfoLog);
+    strInfoLog[infoLogLength] = 0;
+    LOGE("Shader compile failed: %s", strInfoLog);
+    delete [] strInfoLog;
+    return -1;
+  }
+  return static_cast<int>(shaderHandle);
+}
+