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//
// Copyright 2015 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef OPENSUBDIV_EXAMPLES_GL_UTILS_H
#define OPENSUBDIV_EXAMPLES_GL_UTILS_H
#include "glLoader.h"
#include <cstdio>
#include <string>
#include <iostream>
namespace GLUtils {
void InitializeGL();
void SetMinimumGLVersion(int argc=0, char **argv=NULL);
void PrintGLVersion();
void CheckGLErrors(std::string const & where = "");
GLuint CompileShader(GLenum shaderType, const char *source);
void WriteScreenshot(int width, int height);
bool SupportsAdaptiveTessellation();
// Helper function that parses the opengl version string, retrieving the
// major and minor version from it.
void GetMajorMinorVersion(int *major, int *minor);
// Gets the shader version based on the current opengl version and returns
// it in a string form.
std::string GetShaderVersion();
std::string GetShaderVersionInclude();
bool GL_ARBSeparateShaderObjectsOrGL_VERSION_4_1();
bool GL_ARBComputeShaderOrGL_VERSION_4_3();
};
#endif // OPENSUBDIV_EXAMPLES_GL_UTILS_H
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