clear.c revision 32001f49 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.9
4 *
5 * Copyright (C) 2010 LunarG Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 *
25 * Authors:
26 *    Chia-I Wu <olv@lunarg.com>
27 */
28
29/*
30 * This demo tests eglGetProcAddress and glClear.
31 */
32
33#include <stdlib.h>
34#include <stdio.h>
35#include <EGL/egl.h>
36#include <GLES/gl.h>
37
38#include "eglut.h"
39
40typedef void (GL_APIENTRY *type_ClearColor)(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
41typedef void (GL_APIENTRY *type_Clear)(GLbitfield mask);
42
43static type_ClearColor fn_ClearColor;
44static type_Clear fn_Clear;
45
46static void
47draw(void)
48{
49   fn_Clear(GL_COLOR_BUFFER_BIT);
50}
51
52static void *
53get_proc(const char *name)
54{
55   void *proc;
56
57   proc = (void *) eglGetProcAddress(name);
58   if (!proc) {
59      /*
60       * note that eglGetProcAddress is not required to support non-extension
61       * functions
62       */
63      printf("failed to find %s (not necessarily a bug)\n", name);
64      exit(1);
65   }
66
67   return proc;
68}
69
70static void
71init(void)
72{
73   fn_ClearColor = (type_ClearColor) get_proc("glClearColor");
74   fn_Clear = (type_Clear) get_proc("glClear");
75
76   fn_ClearColor(1.0, 0.4, 0.4, 0.0);
77}
78
79int
80main(int argc, char *argv[])
81{
82   eglutInitWindowSize(300, 300);
83   eglutInitAPIMask(EGLUT_OPENGL_ES1_BIT);
84   eglutInit(argc, argv);
85
86   eglutCreateWindow("clear");
87
88   eglutDisplayFunc(draw);
89
90   init();
91
92   eglutMainLoop();
93
94   return 0;
95}
96