[Remoting] OpenGL Rendering Layer

remoting/client/gl_helpers.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/client/gl_helpers.h"
+
+#include "base/logging.h"
+
+namespace remoting {
+
+GLuint CompileShader(GLenum shader_type, const char* shader_source) {
+  GLuint shader = glCreateShader(shader_type);
+
+  if (shader != 0) {
+    int shader_source_length = strlen(shader_source);
+    // Pass in the shader source.
+    glShaderSource(shader, 1, &shader_source, &shader_source_length);
+
+    // Compile the shader.
+    glCompileShader(shader);
+
+    // Get the compilation status.
+    GLint compile_status;
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &compile_status);
+
+    // If the compilation failed, delete the shader.
+    if (compile_status == GL_FALSE) {
+      LOG(ERROR) << "Error compiling shader: \n" << shader_source;
+      glDeleteShader(shader);
+      shader = 0;
+    }
+  }
+
+  if (shader == 0) {
+    LOG(FATAL) << "Error creating shader.";
+  }
+
+  return shader;
+}
+
+GLuint CreateProgram(GLuint vertex_shader, GLuint fragment_shader) {
+  GLuint program = glCreateProgram();
+
+  if (program != 0) {
+    glAttachShader(program, vertex_shader);
+    glAttachShader(program, fragment_shader);
+    glLinkProgram(program);
+
+    // Get the link status.
+    GLint link_status;
+    glGetProgramiv(program, GL_LINK_STATUS, &link_status);
+    // If the link failed, delete the program.
+    if (link_status == GL_FALSE) {
+      LOG(ERROR) << "Error compiling program.";
+      glDeleteProgram(program);
+      program = 0;
+    }
+  }
+
+  if (program == 0) {
+    LOG(FATAL) << "Error creating program.";
+  }
+
+  return program;
+}
+
+GLuint CreateTexture() {
+  GLuint texture;
+  glGenTextures(1, &texture);
+  if (texture == 0) {
+    LOG(FATAL) << "Error creating texture.";
+  }
+  return texture;
+}
+
+GLuint CreateBuffer(const void* data, int size) {
+  GLuint buffer;
+  glGenBuffers(1, &buffer);
+  glBindBuffer(GL_ARRAY_BUFFER, buffer);
+  glBufferData(GL_ARRAY_BUFFER, size, data, GL_STATIC_DRAW);
+  glBindBuffer(GL_ARRAY_BUFFER, 0);
+  return buffer;
+}
+
+}  // namespace remoting