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    fflush(stderr);
  46
  47    glClearColor(0.0, 0.0, 1.0, 0.0);
  48
  49 #define SIZE 16
  50    {
  51       GLubyte tex2d[SIZE][SIZE][4];
  52       GLint s, t;
  53
  54       for (s = 0; s < SIZE; s++) {
  55          for (t = 0; t < SIZE; t++) {
  56             /* bgra:
  57              */
  58             tex2d[t][s][0] = 0x30;
  59             tex2d[t][s][1] = t*255/(SIZE-1);
  60             tex2d[t][s][2] = s*255/(SIZE-1);
  61             tex2d[t][s][3] = 0xff;
  62          }
  63       }
  64
  65
  66       /* put image into DrawPBO */
  67       glGenBuffersARB(1, &DrawPBO);
  68       glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, DrawPBO);
  69       glBufferDataARB(GL_PIXEL_PACK_BUFFER_EXT,
  70                       SIZE * SIZE * 4, tex2d, GL_STATIC_DRAW);
  71       glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, 0);
  72
  73
  74       glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
  75       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
  76       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  77       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  78
  79       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  80       glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
  81       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE, SIZE, 0,
  82                    GL_BGRA, GL_UNSIGNED_BYTE, NULL);
  83       glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
  84       glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
  85       glEnable(GL_TEXTURE_2D);
  86    }
  87
  88 }
  89
  90 static void Reshape(int width, int height)
  91 {
  92
  93     glViewport(0, 0, (GLint)width, (GLint)height);
  94
  95     glMatrixMode(GL_PROJECTION);
  96     glLoadIdentity();
  97     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  98     glMatrixMode(GL_MODELVIEW);
  99 }
 100
 101 static void Key(unsigned char key, int x, int y)
 102 {
 103
 104     switch (key) {
 105       case 27:
 106         exit(1);
 107       default:
 108         break;
 109     }
 110
 111     glutPostRedisplay();
 112 }
 113
 114 static void Draw(void)
 115 {
 116    glClear(GL_COLOR_BUFFER_BIT);
 117
 118    glBegin(GL_QUADS);
 119    glTexCoord2f(1,0);
 120    glVertex3f( 0.9, -0.9, -30.0);
 121    glTexCoord2f(1,1);
 122    glVertex3f( 0.9,  0.9, -30.0);
 123    glTexCoord2f(0,1);
 124    glVertex3f(-0.9,  0.9, -30.0);
 125    glTexCoord2f(0,0);
 126    glVertex3f(-0.9,  -0.9, -30.0);
 127    glEnd();
 128
 129    glFlush();
 130
 131    if (doubleBuffer) {
 132       glutSwapBuffers();
 133    }
 134 }
 135
 136 static GLenum Args(int argc, char **argv)
 137 {
 138     GLint i;
 139
 140     doubleBuffer = GL_FALSE;
 141
 142     for (i = 1; i < argc; i++) {
 143         if (strcmp(argv[i], "-sb") == 0) {
 144             doubleBuffer = GL_FALSE;
 145         } else if (strcmp(argv[i], "-db") == 0) {
 146             doubleBuffer = GL_TRUE;
 147         } else {
 148             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 149             return GL_FALSE;
 150         }
 151     }
 152     return GL_TRUE;
 153 }
 154
 155 int main(int argc, char **argv)
 156 {
 157     GLenum type;
 158
 159     glutInit(&argc, argv);
 160
 161     if (Args(argc, argv) == GL_FALSE) {
 162         exit(1);
 163     }
 164
 165     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 166
 167     type = GLUT_RGB;
 168     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 169     glutInitDisplayMode(type);
 170
 171     if (glutCreateWindow(*argv) == GL_FALSE) {
 172         exit(1);
 173     }
 174
 175     glewInit();
 176
 177     Init();
 178
 179     glutReshapeFunc(Reshape);
 180     glutKeyboardFunc(Key);
 181     glutDisplayFunc(Draw);
 182     glutMainLoop();
 183         return 0;
 184 }