src/egl/opengles1/clear.c

   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
  40 typedef void (GL_APIENTRY *type_ClearColor)(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
  41 typedef void (GL_APIENTRY *type_Clear)(GLbitfield mask);
  42
  43 static type_ClearColor fn_ClearColor;
  44 static type_Clear fn_Clear;
  45
  46 static void
  47 draw(void)
  48 {
  49    fn_Clear(GL_COLOR_BUFFER_BIT);
  50 }
  51
  52 static void *
  53 get_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
  70 static void
  71 init(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
  79 int
  80 main(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 }