progs/es1/screen/tri.c

   1 /*
   2  * Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
   3  *
   4  * Based on egltri by
   5  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2008  Brian Paul   All Rights Reserved.
   7  * Copyright (C) 2008  Jakob Bornecrantz   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <GLES/gl.h>
  31 #include "winsys.h"
  32
  33 static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0;
  34
  35 static void tri_init()
  36 {
  37    glClearColor(0.4, 0.4, 0.4, 0.0);
  38 }
  39
  40 static void tri_reshape(int width, int height)
  41 {
  42    GLfloat ar = (GLfloat) width / (GLfloat) height;
  43
  44    glViewport(0, 0, (GLint) width, (GLint) height);
  45
  46    glMatrixMode(GL_PROJECTION);
  47    glLoadIdentity();
  48    glFrustumf(-ar, ar, -1, 1, 5.0, 60.0);
  49
  50    glMatrixMode(GL_MODELVIEW);
  51    glLoadIdentity();
  52    glTranslatef(0.0, 0.0, -10.0);
  53 }
  54
  55 static void tri_draw(void *data)
  56 {
  57    static const GLfloat verts[3][2] = {
  58       { -1, -1 },
  59       {  1, -1 },
  60       {  0,  1 }
  61    };
  62    static const GLfloat colors[3][4] = {
  63       { 1, 0, 0, 1 },
  64       { 0, 1, 0, 1 },
  65       { 0, 0, 1, 1 }
  66    };
  67
  68    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  69
  70    glPushMatrix();
  71    glRotatef(view_rotx, 1, 0, 0);
  72    glRotatef(view_roty, 0, 1, 0);
  73    glRotatef(view_rotz, 0, 0, 1);
  74
  75    {
  76       glVertexPointer(2, GL_FLOAT, 0, verts);
  77       glColorPointer(4, GL_FLOAT, 0, colors);
  78       glEnableClientState(GL_VERTEX_ARRAY);
  79       glEnableClientState(GL_COLOR_ARRAY);
  80
  81       glDrawArrays(GL_TRIANGLES, 0, 3);
  82
  83       glDisableClientState(GL_VERTEX_ARRAY);
  84       glDisableClientState(GL_COLOR_ARRAY);
  85    }
  86
  87    glPopMatrix();
  88 }
  89
  90 static void tri_run(void)
  91 {
  92    winsysRun(3.0, tri_draw, NULL);
  93 }
  94
  95 int main(int argc, char *argv[])
  96 {
  97    EGLint width, height;
  98    GLboolean printInfo = GL_FALSE;
  99    int i;
 100
 101    /* parse cmd line args */
 102    for (i = 1; i < argc; i++) {
 103       if (strcmp(argv[i], "-info") == 0) {
 104          printInfo = GL_TRUE;
 105       }
 106       else {
 107          printf("Warning: unknown parameter: %s\n", argv[i]);
 108       }
 109    }
 110
 111    if (!winsysInitScreen())
 112       exit(1);
 113    winsysQueryScreenSize(&width, &height);
 114
 115    if (printInfo) {
 116       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 117       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 118       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 119       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 120    }
 121
 122    tri_init();
 123    tri_reshape(width, height);
 124    tri_run();
 125
 126    winsysFiniScreen();
 127
 128    return 0;
 129 }