1/*
2 * fg_gl2.c
3 *
4 * Load OpenGL (ES) 2.0 functions used by fg_geometry
5 *
6 * Copyright (C) 2012 Sylvain Beucler
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
22 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26#ifndef FG_GL2_H
27#define FG_GL2_H
28
29#include <GL/freeglut.h>
30#include "fg_internal.h"
31
32#ifdef GL_ES_VERSION_2_0
33/* Use existing functions on GLES 2.0 */
34
35#define FGH_ARRAY_BUFFER GL_ARRAY_BUFFER
36#define FGH_STATIC_DRAW GL_STATIC_DRAW
37#define FGH_ELEMENT_ARRAY_BUFFER GL_ELEMENT_ARRAY_BUFFER
38
39#define fghGenBuffers glGenBuffers
40#define fghDeleteBuffers glDeleteBuffers
41#define fghBindBuffer glBindBuffer
42#define fghBufferData glBufferData
43#define fghEnableVertexAttribArray glEnableVertexAttribArray
44#define fghDisableVertexAttribArray glDisableVertexAttribArray
45#define fghVertexAttribPointer glVertexAttribPointer
46
47#else
48/* Load functions dynamically, they are not defined in e.g. win32's
49 OpenGL headers */
50
51# ifndef APIENTRY
52# define APIENTRY
53# endif
54
55/* extension #defines, types and entries, avoiding a dependency on additional
56 libraries like GLEW or the GL/glext.h header */
57#define FGH_ARRAY_BUFFER 0x8892
58#define FGH_STATIC_DRAW 0x88E4
59#define FGH_ELEMENT_ARRAY_BUFFER 0x8893
60
61typedef int fghGLsizeiptr;
62typedef void (APIENTRY *FGH_PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
63typedef void (APIENTRY *FGH_PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
64typedef void (APIENTRY *FGH_PFNGLBUFFERDATAPROC) (GLenum target, fghGLsizeiptr size, const GLvoid *data, GLenum usage);
65typedef void (APIENTRY *FGH_PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint* buffers);
66typedef void (APIENTRY *FGH_PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
67typedef void (APIENTRY *FGH_PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint);
68typedef void (APIENTRY *FGH_PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);
69
70FGH_PFNGLGENBUFFERSPROC fghGenBuffers;
71FGH_PFNGLDELETEBUFFERSPROC fghDeleteBuffers;
72FGH_PFNGLBINDBUFFERPROC fghBindBuffer;
73FGH_PFNGLBUFFERDATAPROC fghBufferData;
74FGH_PFNGLENABLEVERTEXATTRIBARRAYPROC fghEnableVertexAttribArray;
75FGH_PFNGLDISABLEVERTEXATTRIBARRAYPROC fghDisableVertexAttribArray;
76FGH_PFNGLVERTEXATTRIBPOINTERPROC fghVertexAttribPointer;
77
78# endif
79
80extern void fgInitGL2();
81
82#endif
83