helper_gl.h
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/**
* Copyright 2014 NVIDIA Corporation. All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/
// These are helper functions for the SDK samples (OpenGL)
#ifndef HELPER_GL_H
#define HELPER_GL_H
#if defined(WIN32) || defined(_WIN32) || defined(WIN64) || defined(_WIN64)
#include <GL/glew.h>
#endif
#if defined(__APPLE__) || defined(MACOSX)
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#ifdef __linux__
#include <GL/glx.h>
#endif /* __linux__ */
#endif
#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>
#include <iterator>
#include <vector>
#include <assert.h>
/* Prototypes */
namespace __HelperGL {
static int isGLVersionSupported(unsigned reqMajor, unsigned reqMinor);
static int areGLExtensionsSupported(const std::string &);
#ifdef __linux__
#ifndef HELPERGL_EXTERN_GL_FUNC_IMPLEMENTATION
#define USE_GL_FUNC(name, proto) proto name = (proto) glXGetProcAddress ((const GLubyte *)#name)
#else
#define USE_GL_FUNC(name, proto) extern proto name
#endif
USE_GL_FUNC(glBindBuffer, PFNGLBINDBUFFERPROC);
USE_GL_FUNC(glDeleteBuffers, PFNGLDELETEBUFFERSPROC);
USE_GL_FUNC(glBufferData, PFNGLBUFFERDATAPROC);
USE_GL_FUNC(glBufferSubData, PFNGLBUFFERSUBDATAPROC);
USE_GL_FUNC(glGenBuffers, PFNGLGENBUFFERSPROC);
USE_GL_FUNC(glCreateProgram, PFNGLCREATEPROGRAMPROC);
USE_GL_FUNC(glBindProgramARB, PFNGLBINDPROGRAMARBPROC);
USE_GL_FUNC(glGenProgramsARB, PFNGLGENPROGRAMSARBPROC);
USE_GL_FUNC(glDeleteProgramsARB, PFNGLDELETEPROGRAMSARBPROC);
USE_GL_FUNC(glDeleteProgram, PFNGLDELETEPROGRAMPROC);
USE_GL_FUNC(glGetProgramInfoLog, PFNGLGETPROGRAMINFOLOGPROC);
USE_GL_FUNC(glGetProgramiv, PFNGLGETPROGRAMIVPROC);
USE_GL_FUNC(glProgramParameteriEXT, PFNGLPROGRAMPARAMETERIEXTPROC);
USE_GL_FUNC(glProgramStringARB, PFNGLPROGRAMSTRINGARBPROC);
USE_GL_FUNC(glUnmapBuffer, PFNGLUNMAPBUFFERPROC);
USE_GL_FUNC(glMapBuffer, PFNGLMAPBUFFERPROC);
USE_GL_FUNC(glGetBufferParameteriv, PFNGLGETBUFFERPARAMETERIVPROC);
USE_GL_FUNC(glLinkProgram, PFNGLLINKPROGRAMPROC);
USE_GL_FUNC(glUseProgram, PFNGLUSEPROGRAMPROC);
USE_GL_FUNC(glAttachShader, PFNGLATTACHSHADERPROC);
USE_GL_FUNC(glCreateShader, PFNGLCREATESHADERPROC);
USE_GL_FUNC(glShaderSource, PFNGLSHADERSOURCEPROC);
USE_GL_FUNC(glCompileShader, PFNGLCOMPILESHADERPROC);
USE_GL_FUNC(glDeleteShader, PFNGLDELETESHADERPROC);
USE_GL_FUNC(glGetShaderInfoLog, PFNGLGETSHADERINFOLOGPROC);
USE_GL_FUNC(glGetShaderiv, PFNGLGETSHADERIVPROC);
USE_GL_FUNC(glUniform1i, PFNGLUNIFORM1IPROC);
USE_GL_FUNC(glUniform1f, PFNGLUNIFORM1FPROC);
USE_GL_FUNC(glUniform2f, PFNGLUNIFORM2FPROC);
USE_GL_FUNC(glUniform3f, PFNGLUNIFORM3FPROC);
USE_GL_FUNC(glUniform4f, PFNGLUNIFORM4FPROC);
USE_GL_FUNC(glUniform1fv, PFNGLUNIFORM1FVPROC);
USE_GL_FUNC(glUniform2fv, PFNGLUNIFORM2FVPROC);
USE_GL_FUNC(glUniform3fv, PFNGLUNIFORM3FVPROC);
USE_GL_FUNC(glUniform4fv, PFNGLUNIFORM4FVPROC);
USE_GL_FUNC(glUniformMatrix4fv, PFNGLUNIFORMMATRIX4FVPROC);
USE_GL_FUNC(glSecondaryColor3fv, PFNGLSECONDARYCOLOR3FVPROC);
USE_GL_FUNC(glGetUniformLocation, PFNGLGETUNIFORMLOCATIONPROC);
USE_GL_FUNC(glGenFramebuffersEXT, PFNGLGENFRAMEBUFFERSEXTPROC);
USE_GL_FUNC(glBindFramebufferEXT, PFNGLBINDFRAMEBUFFEREXTPROC);
USE_GL_FUNC(glDeleteFramebuffersEXT, PFNGLDELETEFRAMEBUFFERSEXTPROC);
USE_GL_FUNC(glCheckFramebufferStatusEXT, PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC);
USE_GL_FUNC(glGetFramebufferAttachmentParameterivEXT, PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC);
USE_GL_FUNC(glFramebufferTexture1DEXT, PFNGLFRAMEBUFFERTEXTURE1DEXTPROC);
USE_GL_FUNC(glFramebufferTexture2DEXT, PFNGLFRAMEBUFFERTEXTURE2DEXTPROC);
USE_GL_FUNC(glFramebufferTexture3DEXT, PFNGLFRAMEBUFFERTEXTURE3DEXTPROC);
USE_GL_FUNC(glGenerateMipmapEXT, PFNGLGENERATEMIPMAPEXTPROC);
USE_GL_FUNC(glGenRenderbuffersEXT, PFNGLGENRENDERBUFFERSEXTPROC);
USE_GL_FUNC(glDeleteRenderbuffersEXT, PFNGLDELETERENDERBUFFERSEXTPROC);
USE_GL_FUNC(glBindRenderbufferEXT, PFNGLBINDRENDERBUFFEREXTPROC);
USE_GL_FUNC(glRenderbufferStorageEXT, PFNGLRENDERBUFFERSTORAGEEXTPROC);
USE_GL_FUNC(glFramebufferRenderbufferEXT, PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC);
USE_GL_FUNC(glClampColorARB, PFNGLCLAMPCOLORARBPROC);
USE_GL_FUNC(glBindFragDataLocationEXT, PFNGLBINDFRAGDATALOCATIONEXTPROC);
#ifndef GLX_EXTENSION_NAME
USE_GL_FUNC(glActiveTexture, PFNGLACTIVETEXTUREPROC);
USE_GL_FUNC(glClientActiveTexture, PFNGLACTIVETEXTUREPROC);
#endif
#undef USE_GL_FUNC
#endif /*__linux__ */
}
namespace __HelperGL {
namespace __Int {
static std::vector<std::string> split(const std::string &str)
{
std::istringstream ss(str);
std::istream_iterator<std::string> it(ss);
return std::vector<std::string> (it, std::istream_iterator<std::string>());
}
/* Sort the vector passed by reference */
template<typename T> static inline void sort(std::vector<T> &a)
{
std::sort(a.begin(), a.end());
}
/* Compare two vectors */
template<typename T> static int equals(std::vector<T> a, std::vector<T> b)
{
if (a.size() != b.size()) return 0;
sort(a);
sort(b);
return std::equal(a.begin(), a.end(), b.begin());
}
template<typename T> static std::vector<T> getIntersection(std::vector<T> a, std::vector<T> b)
{
sort(a);
sort(b);
std::vector<T> rc;
std::set_intersection(a.begin(), a.end(), b.begin(), b.end(),
std::back_inserter<std::vector<std::string> >(rc));
return rc;
}
static std::vector<std::string> getGLExtensions()
{
std::string extensionsStr( (const char *)glGetString(GL_EXTENSIONS));
return split (extensionsStr);
}
}
static int areGLExtensionsSupported(const std::string &extensions)
{
std::vector<std::string> all = __Int::getGLExtensions();
std::vector<std::string> requested = __Int::split(extensions);
std::vector<std::string> matched = __Int::getIntersection(all, requested);
return __Int::equals(matched, requested);
}
static int isGLVersionSupported(unsigned reqMajor, unsigned reqMinor)
{
#if defined(WIN32) || defined(_WIN32) || defined(WIN64) || defined(_WIN64)
if (glewInit() != GLEW_OK)
{
std::cerr << "glewInit() failed!" << std::endl;
return 0;
}
#endif
std::string version ((const char *) glGetString (GL_VERSION));
std::stringstream stream (version);
unsigned major, minor;
char dot;
stream >> major >> dot >> minor;
assert (dot == '.');
return major > reqMajor || (major == reqMajor && minor >= reqMinor);
}
} /* of namespace __HelperGL*/
using namespace __HelperGL;
#endif /*HELPER_GL_H*/