/usr/include/allegro5/allegro_opengl.h is in liballegro5-dev 2:5.0.10-3+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* /\ _ \ /\_ \ /\_ \
* \ \ \L\ \\//\ \ \//\ \ __ __ _ __ ___
* \ \ __ \ \ \ \ \ \ \ /'__`\ /'_ `\/\`'__\/ __`\
* \ \ \/\ \ \_\ \_ \_\ \_/\ __//\ \L\ \ \ \//\ \L\ \
* \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
* \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
* /\____/
* \_/__/
*
* Main header file for all OpenGL drivers.
*
* By Milan Mimica.
*
*/
#ifndef __al_included_allegro5_allegro_opengl_h
#define __al_included_allegro5_allegro_opengl_h
#ifdef __cplusplus
extern "C" {
#endif
#if defined(ALLEGRO_WINDOWS)
#include <windows.h>
#endif
#if defined ALLEGRO_IPHONE
#include <OpenGLES/ES1/gl.h>
#include <OpenGLES/ES1/glext.h>
#include <OpenGLES/ES2/gl.h>
#include <OpenGLES/ES2/glext.h>
/* Apple defines OES versions for these - however the separated alpha ones
* don't seem to work on the device and just crash.
*/
#define glBlendEquation glBlendEquationOES
#define glBlendFuncSeparate glBlendFuncSeparateOES
#define glBlendEquationSeparate glBlendEquationSeparateOES
#ifdef GL_FUNC_ADD
#undef GL_FUNC_ADD
#undef GL_FUNC_SUBTRACT
#undef GL_FUNC_REVERSE_SUBTRACT
#endif
#define GL_FUNC_ADD GL_FUNC_ADD_OES
#define GL_FUNC_SUBTRACT GL_FUNC_SUBTRACT_OES
#define GL_FUNC_REVERSE_SUBTRACT GL_FUNC_REVERSE_SUBTRACT_OES
#elif defined ALLEGRO_MACOSX
#include <OpenGL/OpenGL.h>
#include <OpenGL/gl.h>
#include <OpenGL/glext.h>
#ifndef GL_GLEXT_PROTOTYPES
#define GL_GLEXT_PROTOTYPES
#endif
#elif defined ALLEGRO_GP2XWIZ
#include <wiz/GL/gl.h>
#include <wiz/GL/nanogl.h>
#include <wiz/GL/wizGLES.h>
#include <wiz/GL/egl.h>
#else /* ALLEGRO_MACOSX */
/* HACK: Prevent both Mesa and SGI's broken headers from screwing us */
#define __glext_h_
#define __glxext_h_
#include <GL/gl.h>
#undef __glext_h_
#undef __glxext_h_
#endif /* ALLEGRO_MACOSX */
#include "allegro5/opengl/gl_ext.h"
#ifdef ALLEGRO_WINDOWS
/* Missing #defines from Mingw */
#ifndef PFD_SWAP_LAYER_BUFFERS
#define PFD_SWAP_LAYER_BUFFERS 0x00000800
#endif
#ifndef PFD_GENERIC_ACCELERATED
#define PFD_GENERIC_ACCELERATED 0x00001000
#endif
#ifndef PFD_SUPPORT_DIRECTDRAW
#define PFD_SUPPORT_DIRECTDRAW 0x00002000
#endif
#ifndef CDS_FULLSCREEN
#define CDS_FULLSCREEN 0x00000004
#endif
#ifndef ENUM_CURRENT_SETTINGS
#define ENUM_CURRENT_SETTINGS ((DWORD)-1)
#endif
#endif /* ALLEGRO_WINDOWS */
#if defined ALLEGRO_WINDOWS
#define ALLEGRO_DEFINE_PROC_TYPE(type, name, args) \
typedef type (APIENTRY * name) args;
#else
#define ALLEGRO_DEFINE_PROC_TYPE(type, name, args) \
typedef type (*name) args;
#endif
/*
* Public OpenGL-related API
*/
/* Enum: ALLEGRO_OPENGL_VARIANT
*/
typedef enum ALLEGRO_OPENGL_VARIANT {
ALLEGRO_DESKTOP_OPENGL = 0,
ALLEGRO_OPENGL_ES
} ALLEGRO_OPENGL_VARIANT;
AL_FUNC(uint32_t, al_get_opengl_version, (void));
AL_FUNC(bool, al_have_opengl_extension, (const char *extension));
AL_FUNC(void*, al_get_opengl_proc_address, (const char *name));
AL_FUNC(ALLEGRO_OGL_EXT_LIST*, al_get_opengl_extension_list, (void));
AL_FUNC(GLuint, al_get_opengl_texture, (ALLEGRO_BITMAP *bitmap));
AL_FUNC(void, al_remove_opengl_fbo, (ALLEGRO_BITMAP *bitmap));
AL_FUNC(GLuint, al_get_opengl_fbo, (ALLEGRO_BITMAP *bitmap));
AL_FUNC(void, al_get_opengl_texture_size, (ALLEGRO_BITMAP *bitmap,
int *w, int *h));
AL_FUNC(void, al_get_opengl_texture_position, (ALLEGRO_BITMAP *bitmap,
int *u, int *v));
AL_FUNC(void, al_set_current_opengl_context, (ALLEGRO_DISPLAY *display));
AL_FUNC(int, al_get_opengl_variant, (void));
#ifdef __cplusplus
}
#endif
#endif
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