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#pragma once
static GLenum (*_glGetError)(void);
static void (*_glGetIntegerv)(GLenum, GLint*);
static GLboolean (*_glIsBuffer)(GLuint);
static void (*_glGenBuffers)(GLsizei, GLuint*);
static void (*_glDeleteBuffers)(GLsizei, GLuint*);
static void (*_glBindBuffer)(GLenum, GLuint);
static void (*_glBufferData)(GLenum, GLsizeiptr, const GLvoid*, GLenum);
static void* (*_glMapBuffer)(GLenum, GLenum);
static void (*_glUnmapBuffer)(GLenum);
static void (*_glPixelStorei)(GLenum, GLint);
static void (*_glReadPixels)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLvoid*);
static void (*_glPushClientAttrib)(GLbitfield);
static void (*_glPopClientAttrib)(void);
static void (*_glPushAttrib)(GLbitfield);
static void (*_glPopAttrib)(void);
static void (*_glEnable)(GLenum);
static void (*_glDisable)(GLenum);
static void (*_glScissor)(GLint, GLint, GLsizei, GLsizei);
static void (*_glClearColor)(GLclampf, GLclampf, GLclampf, GLclampf);
static void (*_glClear)(GLbitfield);
#define glGetError _glGetError
#define glGetIntegerv _glGetIntegerv
#define glIsBuffer _glIsBuffer
#define glGenBuffers _glGenBuffers
#define glDeleteBuffers _glDeleteBuffers
#define glBindBuffer _glBindBuffer
#define glBufferData _glBufferData
#define glMapBuffer _glMapBuffer
#define glUnmapBuffer _glUnmapBuffer
#define glPixelStorei _glPixelStorei
#define glReadPixels _glReadPixels
#define glPushClientAttrib _glPushClientAttrib
#define glPopClientAttrib _glPopClientAttrib
#define glPushAttrib _glPushAttrib
#define glPopAttrib _glPopAttrib
#define glEnable _glEnable
#define glDisable _glDisable
#define glScissor _glScissor
#define glClearColor _glClearColor
#define glClear _glClear
static void
load_gl_function_pointers(void* (*procs[])(const char*), const size_t memb)
{
static bool loaded;
if (loaded)
return;
void* (*proc)(const char*);
for (size_t i = 0; i < memb; ++i) {
if ((proc = procs[i]))
break;
}
if (!proc)
ERRX(EXIT_FAILURE, "There is no proc loader available");
#define GL(x) do { if (!(_##x = proc(#x))) { ERRX(EXIT_FAILURE, "Failed to load %s", #x); } } while (0)
GL(glGetError);
GL(glGetIntegerv);
GL(glIsBuffer);
GL(glGenBuffers);
GL(glDeleteBuffers);
GL(glBindBuffer);
GL(glBufferData);
GL(glMapBuffer);
GL(glUnmapBuffer);
GL(glPixelStorei);
GL(glReadPixels);
GL(glPushClientAttrib);
GL(glPopClientAttrib);
GL(glPushAttrib);
GL(glPopAttrib);
GL(glEnable);
GL(glDisable);
GL(glScissor);
GL(glClearColor);
GL(glClear);
#undef GL
loaded = true;
}
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