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// Copyright 2015 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.
#ifndef UI_GL_GL_HELPER_H_
#define UI_GL_GL_HELPER_H_
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_export.h"
namespace gl {
class GL_EXPORT GLHelper {
// Compiles a shader.
// Does not check for errors, always returns shader.
static GLuint CompileShader(GLenum type, const char* src);
// Compiles a shader and checks for compilation errors.
// Returns shader, 0 on failure.
static GLuint LoadShader(GLenum type, const char* src);
// 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);
// Sets up a vertex buffer containing 4 vertices that can be used to draw
// a quad as a tri-strip.
static GLuint SetupQuadVertexBuffer();
// Draws a quad to the currently bound frame buffer.
static void DrawQuad(GLuint vertex_buffer);
// When using the desktop core profile we have to bind a VAO before
// calling glVertexAttribPointer.
static bool ShouldTestsUseVAOs();
} // namespace gl
#endif // UI_GL_GL_HELPER_H_