progs/trivial/quad-tex-pbo.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <GL/glew.h>
  26
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <GL/glut.h>
  31
  32
  33 #define CI_OFFSET_1 16
  34 #define CI_OFFSET_2 32
  35
  36 GLenum doubleBuffer;
  37
  38 static GLuint DrawPBO;
  39
  40 static void Init(void)
  41 {
  42    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  43    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  44    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  45
  46    glClearColor(0.0, 0.0, 1.0, 0.0);
  47
  48 #define SIZE 16
  49    {
  50       GLubyte tex2d[SIZE][SIZE][4];
  51       GLint s, t;
  52
  53       for (s = 0; s < SIZE; s++) {
  54          for (t = 0; t < SIZE; t++) {
  55             /* bgra:
  56              */
  57             tex2d[t][s][0] = 0x30;
  58             tex2d[t][s][1] = t*255/(SIZE-1);
  59             tex2d[t][s][2] = s*255/(SIZE-1);
  60             tex2d[t][s][3] = 0xff;
  61          }
  62       }
  63
  64
  65       /* put image into DrawPBO */
  66       glGenBuffersARB(1, &DrawPBO);
  67       glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, DrawPBO);
  68       glBufferDataARB(GL_PIXEL_PACK_BUFFER_EXT,
  69                       SIZE * SIZE * 4, tex2d, GL_STATIC_DRAW);
  70       glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, 0);
  71
  72
  73       glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
  74       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
  75       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  76       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  77
  78       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  79       glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
  80       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE, SIZE, 0,
  81                    GL_BGRA, GL_UNSIGNED_BYTE, NULL);
  82       glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
  83       glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
  84       glEnable(GL_TEXTURE_2D);
  85    }
  86
  87 }
  88
  89 static void Reshape(int width, int height)
  90 {
  91
  92     glViewport(0, 0, (GLint)width, (GLint)height);
  93
  94     glMatrixMode(GL_PROJECTION);
  95     glLoadIdentity();
  96     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  97     glMatrixMode(GL_MODELVIEW);
  98 }
  99
 100 static void Key(unsigned char key, int x, int y)
 101 {
 102
 103     switch (key) {
 104       case 27:
 105         exit(1);
 106       default:
 107         return;
 108     }
 109
 110     glutPostRedisplay();
 111 }
 112
 113 static void Draw(void)
 114 {
 115    glClear(GL_COLOR_BUFFER_BIT);
 116
 117    glBegin(GL_QUADS);
 118    glTexCoord2f(1,0);
 119    glVertex3f( 0.9, -0.9, -30.0);
 120    glTexCoord2f(1,1);
 121    glVertex3f( 0.9,  0.9, -30.0);
 122    glTexCoord2f(0,1);
 123    glVertex3f(-0.9,  0.9, -30.0);
 124    glTexCoord2f(0,0);
 125    glVertex3f(-0.9,  -0.9, -30.0);
 126    glEnd();
 127
 128    glFlush();
 129
 130    if (doubleBuffer) {
 131       glutSwapBuffers();
 132    }
 133 }
 134
 135 static GLenum Args(int argc, char **argv)
 136 {
 137     GLint i;
 138
 139     doubleBuffer = GL_FALSE;
 140
 141     for (i = 1; i < argc; i++) {
 142         if (strcmp(argv[i], "-sb") == 0) {
 143             doubleBuffer = GL_FALSE;
 144         } else if (strcmp(argv[i], "-db") == 0) {
 145             doubleBuffer = GL_TRUE;
 146         } else {
 147             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 148             return GL_FALSE;
 149         }
 150     }
 151     return GL_TRUE;
 152 }
 153
 154 int main(int argc, char **argv)
 155 {
 156     GLenum type;
 157
 158     glutInit(&argc, argv);
 159
 160     if (Args(argc, argv) == GL_FALSE) {
 161         exit(1);
 162     }
 163
 164     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 165
 166     type = GLUT_RGB;
 167     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 168     glutInitDisplayMode(type);
 169
 170     if (glutCreateWindow("First Tri") == GL_FALSE) {
 171         exit(1);
 172     }
 173
 174     glewInit();
 175
 176     Init();
 177
 178     glutReshapeFunc(Reshape);
 179     glutKeyboardFunc(Key);
 180     glutDisplayFunc(Draw);
 181     glutMainLoop();
 182         return 0;
 183 }