gpu/command_buffer/tests/gl_test_utils.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Helper functions for GL.
   6
   7 #ifndef GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_
   8 #define GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_
   9
  10 #include <GLES2/gl2.h>
  11 #include "base/basictypes.h"
  12
  13 class GLTestHelper {
  14  public:
  15   static const uint8 kCheckClearValue = 123u;
  16
  17   static bool HasExtension(const char* extension);
  18   static bool CheckGLError(const char* msg, int line);
  19
  20   // Compiles a shader.
  21   // Does not check for errors, always returns shader.
  22   static GLuint CompileShader(GLenum type, const char* shaderSrc);
  23
  24   // Compiles a shader and checks for compilation errors.
  25   // Returns shader, 0 on failure.
  26   static GLuint LoadShader(GLenum type, const char* shaderSrc);
  27
  28   // Attaches 2 shaders and links them to a program.
  29   // Does not check for errors, always returns program.
  30   static GLuint LinkProgram(GLuint vertex_shader, GLuint fragment_shader);
  31
  32   // Attaches 2 shaders, links them to a program, and checks for errors.
  33   // Returns program, 0 on failure.
  34   static GLuint SetupProgram(GLuint vertex_shader, GLuint fragment_shader);
  35
  36   // Compiles 2 shaders, attaches and links them to a program
  37   // Returns program, 0 on failure.
  38   static GLuint LoadProgram(
  39       const char* vertex_shader_source,
  40       const char* fragment_shader_source);
  41
  42   // Make a unit quad with position only.
  43   // Returns the created buffer.
  44   static GLuint SetupUnitQuad(GLint position_location);
  45
  46   // Make a 6 vertex colors.
  47   // Returns the created buffer.
  48   static GLuint SetupColorsForUnitQuad(
  49       GLint location, const GLfloat color[4], GLenum usage);
  50
  51   // Checks an area of pixels for a color.
  52   static bool CheckPixels(
  53       GLint x, GLint y, GLsizei width, GLsizei height, GLint tolerance,
  54       const uint8* color);
  55
  56   // Uses ReadPixels to save an area of the current FBO/Backbuffer.
  57   static bool SaveBackbufferAsBMP(const char* filename, int width, int height);
  58 };
  59
  60 #endif  // GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_