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// Copyright (c) 2012 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.
// Helper functions for GL.
#ifndef GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_
#define GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_
#include <GLES2/gl2.h>
#include <stdint.h>
#include <vector>
class GLTestHelper {
public:
static const uint8_t kCheckClearValue = 123u;
static bool HasExtension(const char* extension);
static bool CheckGLError(const char* msg, int line);
// Compiles a shader.
// Does not check for errors, always returns shader.
static GLuint CompileShader(GLenum type, const char* shaderSrc);
// Compiles a shader and checks for compilation errors.
// Returns shader, 0 on failure.
static GLuint LoadShader(GLenum type, const char* shaderSrc);
// Attaches 2 shaders and links them to a program.
// Does not check for errors, always returns program.
static GLuint LinkProgram(GLuint vertex_shader, GLuint fragment_shader);
// Attaches 2 shaders, links them to a program, and checks for errors.
// Returns program, 0 on failure.
static GLuint SetupProgram(GLuint vertex_shader, GLuint fragment_shader);
// Compiles 2 shaders, attaches and links them to a program
// Returns program, 0 on failure.
static GLuint LoadProgram(
const char* vertex_shader_source,
const char* fragment_shader_source);
// Make a unit quad with position only.
// Returns the created buffer.
static GLuint SetupUnitQuad(GLint position_location);
// Returns a vector of size 2. The first is the array buffer object,
// the second is the element array buffer object.
static std::vector<GLuint> SetupIndexedUnitQuad(GLint position_location);
// Make a 6 vertex colors.
// Returns the created buffer.
static GLuint SetupColorsForUnitQuad(
GLint location, const GLfloat color[4], GLenum usage);
// Checks an area of pixels for a color.
// If mask is nullptr, compare all color channels; otherwise, compare the
// channels whose corresponding mask bit is true.
static bool CheckPixels(GLint x,
GLint y,
GLsizei width,
GLsizei height,
GLint tolerance,
const uint8_t* color,
const uint8_t* mask);
// Uses ReadPixels to save an area of the current FBO/Backbuffer.
static bool SaveBackbufferAsBMP(const char* filename, int width, int height);
static void DrawTextureQuad(const char* vertex_src,
const char* fragment_src,
const char* position_name,
const char* sampler_name);
};
#endif // GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_
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