progs/xdemos/vindex.c

   1
   2 /*
   3  * Test Linux 8-bit SVGA/Mesa color index mode
   4  *
   5  * Compile with:  gcc vindex.c -I../include -L../lib -lMesaGL -lX11 -lXext
   6  *   -lvga -lm -o vindex
   7  *
   8  * This program is in the public domain.
   9  * Brian Paul, January 1996
  10  */
  11
  12
  13
  14 #include <vga.h>
  15 #include "GL/svgamesa.h"
  16 #include "GL/gl.h"
  17
  18
  19
  20 static GLint width = 640, height = 480;
  21
  22
  23
  24 static void display( void )
  25 {
  26    int i, j;
  27    int w, h;
  28
  29    glViewport( 0, 0, width, height );
  30    glMatrixMode( GL_PROJECTION );
  31    glLoadIdentity();
  32    glOrtho( 0.0, (GLfloat) width, 0.0, (GLfloat) height, -1.0, 1.0 );
  33
  34    glClear( GL_COLOR_BUFFER_BIT );
  35
  36    w = width / 16;
  37    h = height / 16;
  38    for (i=0;i<16;i++) {
  39       for (j=0;j<16;j++) {
  40          glIndexi( i*16+j );
  41          glRecti( i*w, j*h, i*w+w, j*h+h );
  42       }
  43    }
  44 }
  45
  46
  47
  48 int main( int argc, char *argv[] )
  49 {
  50    SVGAMesaContext vmc;
  51    int i;
  52
  53    vga_init();
  54    vga_setmode( G640x480x256 );
  55
  56    vmc = SVGAMesaCreateContext( GL_FALSE );
  57    SVGAMesaMakeCurrent( vmc );
  58
  59    display();
  60    sleep(3);
  61
  62    SVGAMesaDestroyContext( vmc );
  63    vga_setmode( TEXT );
  64    return 0;
  65 }