OpenGL环境配置文件

OpenGL环境配置全文件，与博客教程：OpenGL红宝书第九版环境配置（VS2017）相配套

#include 

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN 1
#include 

static HMODULE libgl;

static void open_libgl（void）
{
	libgl = LoadLibraryA（“opengl32.dll“）;
}

static void close_libgl（void）
{
	FreeLibrary（libgl）;
}

static GL3WglProc get_proc（const char *proc）
{
	GL3WglProc res;

	res = （GL3WglProc） wglGetProcAddress（proc）;
	if （!res）
		res = （GL3WglProc） GetProcAddress（libgl proc）;
	return res;
}
#elif defined（__APPLE__） || defined（__APPLE_CC__）
#include 

CFBundleRef bundle;
CFURLRef bundleURL;

static void open_libgl（void）
{
	bundleURL = CFURLCreateWithFileSystemPath（kCFAllocatorDefault
		CFSTR（“/System/Library/frameworks/OpenGL.framework“）
		kCFURLPOSIXPathstyle true）;

	bundle = CFBundleCreate（kCFAllocatorDefault bundleURL）;
	assert（bundle != NULL）;
}

static void close_libgl（void）
{
	CFRelease（bundle）;
	CFRelease（bundleURL）;
}

static GL3WglProc get_proc（const char *proc）
{
	GL3WglProc res;

	CFStringRef procname = CFStringCreateWithCString（kCFAllocatorDefault proc
		kCFStringEncodingASCII）;
	res = （GL3WglProc） CFBundleGetFunctionPointerForName（bundle procname）;
	CFRelease（procname）;
	return res;
}
#else
#include 
#include 

static void *libgl;

static void open_libgl（void）
{
	libgl = dlopen（“libGL.so.1“ RTLD_LAZY | RTLD_GLOBAL）;
}

static void close_libgl（void）
{
	dlclose（libgl）;
}

static GL3WglProc get_proc（const char *proc）
{
	GL3WglProc res;

	res = （GL3WglProc） glXGetProcAddress（（const GLubyte *） proc）;
	if （!res）
		res = （GL3WglProc） dlsym（libgl proc）;
	return res;
}
#endif

static struct {
	int major minor;
} version;

static int parse_version（void）
{
	if （!glGetIntegerv）
		return -1;

	glGetIntegerv（GL_MAJOR_VERSION &version.major）;
	glGetIntegerv（GL_MINOR_VERSION &version.minor）;

	if （version.major < 3）
		return -1;
	return 0;
}

static void load_procs（void）;

int gl3wInit（void）
{
	open_libgl（）;
	load_procs（）;
	close_libgl（）;
	return parse_version（）;
}

int gl3wIsSupported（int major int minor）
{
	if （major < 3）
		return 0;
	if （version.major == major）
		return version.minor >= minor;
	return version.major >= major;
}

GL3WglProc gl3wGetProcAddress（const char *proc）
{
	return get_proc（proc）;
}

PFNGLCULLFACEPROC gl3wCullFace;
PFNGLFRONTFACEPROC gl3wFrontFace;
PFNGLHINTPROC gl3wHint;
PFNGLLINEWIDTHPROC gl3wLineWidth;
PFNGLPOINTSIZEPROC gl3wPointSize;
PFNGLPOLYGONMODEPROC gl3wPolygonMode;
PFNGLSCISSORPROC gl3wScissor;
PFNGLTEXPARAMETERFPROC gl3wTexParameterf;
PFNGLTEXPARAMETERFVPROC gl3wTexParameterfv;
PFNGLTEXPARAMETERIPROC gl3wTexParameteri;
PFNGLTEXPARAMETERIVPROC gl3wTexParameteriv;
PFNGLTEXIMAGE1DPROC gl3wTexImage1D;
PFNGLTEXIMAGE2DPROC gl3wTexImage2D;
PFNGLDRAWBUFFERPROC gl3wDrawBuffer;
PFNGLCLEARPROC gl3wClear;
PFNGLCLEARCOLORPROC gl3wClearColor;
PFNGLCLEARSTENCILPROC gl3wClearStencil;
PFNGLCLEARDEPTHPROC gl3wClearDepth;
PFNGLSTENCILMASKPROC gl3wStencilMask;
PFNGLCOLORMASKPROC gl3wColorMask;
PFNGLDEPTHMASKPROC gl3wDepthMask;
PFNGLDISABLEPROC gl3wDisabl

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\
     文件          16  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\.gitignore
     文件        2941  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\CMakeLists.txt
     文件        2076  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\README.md
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\doublewrite\
     文件         346  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\doublewrite\blit.fs.glsl
     文件          86  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\doublewrite\blit.vs.glsl
     文件         742  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\doublewrite\double_write.fs.glsl
     文件         956  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\doublewrite\double_write.vs.glsl
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\gouraud\
     文件          91  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\gouraud\gouraud.frag
     文件         185  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\gouraud\gouraud.vert
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\keypress\
     文件          95  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\keypress\keypress.frag
     文件         108  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\keypress\keypress.vert
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\oit\
     文件        1335  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\oit\build_lists.fs.glsl
     文件         951  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\oit\build_lists.vs.glsl
     文件        2053  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\oit\resolve_lists.fs.glsl
     文件          86  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\oit\resolve_lists.vs.glsl
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\overdrawcount\
     文件         344  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\overdrawcount\blit.fs.glsl
     文件          86  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\overdrawcount\blit.vs.glsl
     文件         531  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\overdrawcount\overdraw_count.fs.glsl
     文件         956  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\overdrawcount\overdraw_count.vs.glsl
     目录           0  2018-12-02 22:05  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\pointsprites\
     文件         169  2016-09-09 01:19  OGLPG-9th-Edition\OGLPG-9th-Edition\bin\media\shaders\pointsprites\pointsprites.fs.glsl
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