| /* $Id: paltex.c,v 1.2 1999/11/02 15:09:04 brianp Exp $ */ |
| |
| /* |
| * Paletted texture demo. Written by Brian Paul. |
| * This program is in the public domain. |
| */ |
| |
| /* |
| * $Log: paltex.c,v $ |
| * Revision 1.2 1999/11/02 15:09:04 brianp |
| * new texture image, cleaned-up code |
| * |
| * Revision 1.1.1.1 1999/08/19 00:55:40 jtg |
| * Imported sources |
| * |
| * Revision 3.1 1999/03/28 18:20:49 brianp |
| * minor clean-up |
| * |
| * Revision 3.0 1998/02/14 18:42:29 brianp |
| * initial rev |
| * |
| */ |
| |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/glut.h> |
| |
| |
| static float Rot = 0.0; |
| |
| |
| static void Idle( void ) |
| { |
| Rot += 5.0; |
| glutPostRedisplay(); |
| } |
| |
| |
| static void Display( void ) |
| { |
| glClear( GL_COLOR_BUFFER_BIT ); |
| |
| glPushMatrix(); |
| glRotatef(Rot, 0, 0, 1); |
| |
| glBegin(GL_POLYGON); |
| glTexCoord2f(0, 1); glVertex2f(-1, -0.5); |
| glTexCoord2f(1, 1); glVertex2f( 1, -0.5); |
| glTexCoord2f(1, 0); glVertex2f( 1, 0.5); |
| glTexCoord2f(0, 0); glVertex2f(-1, 0.5); |
| glEnd(); |
| |
| glPopMatrix(); |
| |
| glutSwapBuffers(); |
| } |
| |
| |
| static void Reshape( int width, int height ) |
| { |
| glViewport( 0, 0, width, height ); |
| glMatrixMode( GL_PROJECTION ); |
| glLoadIdentity(); |
| glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 ); |
| glMatrixMode( GL_MODELVIEW ); |
| glLoadIdentity(); |
| glTranslatef( 0.0, 0.0, -7.0 ); |
| } |
| |
| |
| static void Key( unsigned char key, int x, int y ) |
| { |
| (void) x; |
| (void) y; |
| switch (key) { |
| case 27: |
| exit(0); |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void Init( void ) |
| { |
| #define HEIGHT 8 |
| #define WIDTH 32 |
| static char texture[HEIGHT][WIDTH] = { |
| " ", |
| " MMM EEEE SSS AAA ", |
| " M M M E S S A A ", |
| " M M M EEEE SS A A ", |
| " M M M E SS AAAAA ", |
| " M M E S S A A ", |
| " M M EEEE SSS A A ", |
| " " |
| }; |
| GLubyte table[256][4]; |
| int i; |
| |
| if (!glutExtensionSupported("GL_EXT_paletted_texture")) { |
| printf("Sorry, GL_EXT_paletted_texture not supported\n"); |
| exit(0); |
| } |
| |
| /* load the color table for each texel-index */ |
| table[' '][0] = 50; |
| table[' '][1] = 50; |
| table[' '][2] = 50; |
| table[' '][3] = 50; |
| table['M'][0] = 255; |
| table['M'][1] = 0; |
| table['M'][2] = 0; |
| table['M'][3] = 0; |
| table['E'][0] = 0; |
| table['E'][1] = 255; |
| table['E'][2] = 0; |
| table['E'][3] = 0; |
| table['S'][0] = 40; |
| table['S'][1] = 40; |
| table['S'][2] = 255; |
| table['S'][3] = 0; |
| table['A'][0] = 255; |
| table['A'][1] = 255; |
| table['A'][2] = 0; |
| table['A'][3] = 0; |
| |
| #ifdef GL_EXT_paletted_texture |
| |
| #if defined(GL_EXT_shared_texture_palette) && defined(USE_SHARED_PALETTE) |
| printf("Using shared palette\n"); |
| glColorTableEXT(GL_SHARED_TEXTURE_PALETTE_EXT, /* target */ |
| GL_RGBA, /* internal format */ |
| 256, /* table size */ |
| GL_RGBA, /* table format */ |
| GL_UNSIGNED_BYTE, /* table type */ |
| table); /* the color table */ |
| glEnable(GL_SHARED_TEXTURE_PALETTE_EXT); |
| #else |
| glColorTableEXT(GL_TEXTURE_2D, /* target */ |
| GL_RGBA, /* internal format */ |
| 256, /* table size */ |
| GL_RGBA, /* table format */ |
| GL_UNSIGNED_BYTE, /* table type */ |
| table); /* the color table */ |
| #endif |
| |
| glTexImage2D(GL_TEXTURE_2D, /* target */ |
| 0, /* level */ |
| GL_COLOR_INDEX8_EXT, /* internal format */ |
| WIDTH, HEIGHT, /* width, height */ |
| 0, /* border */ |
| GL_COLOR_INDEX, /* texture format */ |
| GL_UNSIGNED_BYTE, /* texture type */ |
| texture); /* teh texture */ |
| #endif |
| |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
| glEnable(GL_TEXTURE_2D); |
| } |
| |
| |
| int main( int argc, char *argv[] ) |
| { |
| glutInit( &argc, argv ); |
| glutInitWindowPosition( 0, 0 ); |
| glutInitWindowSize( 400, 400 ); |
| |
| glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); |
| |
| glutCreateWindow(argv[0]); |
| |
| Init(); |
| |
| glutReshapeFunc( Reshape ); |
| glutKeyboardFunc( Key ); |
| glutDisplayFunc( Display ); |
| glutIdleFunc( Idle ); |
| |
| glutMainLoop(); |
| return 0; |
| } |