187 lines
4.4 KiB
C
187 lines
4.4 KiB
C
/* $Id: paltex.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
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/*
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* Paletted texture demo. Written by Brian Paul. This file in public domain.
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*/
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/*
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* $Log: paltex.c,v $
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* Revision 1.1 1999/08/19 00:55:40 jtg
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* Initial revision
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*
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* Revision 3.1 1999/03/28 18:20:49 brianp
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* minor clean-up
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*
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* Revision 3.0 1998/02/14 18:42:29 brianp
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* initial rev
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <GL/glut.h>
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static float Rot = 0.0;
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static void Idle( void )
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{
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Rot += 5.0;
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glutPostRedisplay();
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}
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static void Display( void )
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{
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glClear( GL_COLOR_BUFFER_BIT );
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glPushMatrix();
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glRotatef(Rot, 0, 0, 1);
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glBegin(GL_POLYGON);
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glTexCoord2f(0, 1); glVertex2f(-1, -1);
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glTexCoord2f(1, 1); glVertex2f( 1, -1);
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glTexCoord2f(1, 0); glVertex2f( 1, 1);
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glTexCoord2f(0, 0); glVertex2f(-1, 1);
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glEnd();
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glPopMatrix();
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glutSwapBuffers();
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}
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static void Reshape( int width, int height )
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{
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -15.0 );
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}
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static void Key( unsigned char key, int x, int y )
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{
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(void) x;
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(void) y;
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switch (key) {
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void SpecialKey( int key, int x, int y )
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{
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(void) x;
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(void) y;
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switch (key) {
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case GLUT_KEY_UP:
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break;
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case GLUT_KEY_DOWN:
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break;
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case GLUT_KEY_LEFT:
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break;
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case GLUT_KEY_RIGHT:
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break;
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}
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glutPostRedisplay();
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}
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static void Init( void )
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{
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GLubyte texture[8][8] = { /* PT = Paletted Texture! */
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{ 0, 0, 0, 0, 0, 0, 0, 0},
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{ 0, 100, 100, 100, 0, 180, 180, 180},
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{ 0, 100, 0, 100, 0, 0, 180, 0},
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{ 0, 100, 0, 100, 0, 0, 180, 0},
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{ 0, 100, 100, 100, 0, 0, 180, 0},
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{ 0, 100, 0, 0, 0, 0, 180, 0},
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{ 0, 100, 0, 0, 0, 0, 180, 0},
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{ 0, 100, 255, 0, 0, 0, 180, 250},
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};
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GLubyte table[256][4];
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int i;
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if (!glutExtensionSupported("GL_EXT_paletted_texture")) {
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printf("Sorry, GL_EXT_paletted_texture not supported\n");
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exit(0);
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}
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/* put some wacky colors into the texture palette */
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for (i=0;i<256;i++) {
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table[i][0] = i;
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table[i][1] = 0;
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table[i][2] = 127 + i / 2;
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table[i][3] = 255;
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}
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#ifdef GL_EXT_paletted_texture
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#if defined(GL_EXT_shared_texture_palette) && defined(SHARED_PALETTE)
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printf("Using shared palette\n");
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glColorTableEXT(GL_SHARED_TEXTURE_PALETTE_EXT, /* target */
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GL_RGBA, /* internal format */
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256, /* table size */
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GL_RGBA, /* table format */
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GL_UNSIGNED_BYTE, /* table type */
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table); /* the color table */
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glEnable(GL_SHARED_TEXTURE_PALETTE_EXT);
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#else
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glColorTableEXT(GL_TEXTURE_2D, /* target */
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GL_RGBA, /* internal format */
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256, /* table size */
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GL_RGBA, /* table format */
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GL_UNSIGNED_BYTE, /* table type */
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table); /* the color table */
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#endif
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glTexImage2D(GL_TEXTURE_2D, /* target */
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0, /* level */
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GL_COLOR_INDEX8_EXT, /* internal format */
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8, 8, /* width, height */
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0, /* border */
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GL_COLOR_INDEX, /* texture format */
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GL_UNSIGNED_BYTE, /* texture type */
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texture); /* teh texture */
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#endif
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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glEnable(GL_TEXTURE_2D);
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}
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int main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowPosition( 0, 0 );
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glutInitWindowSize( 400, 400 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
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glutCreateWindow(argv[0]);
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Init();
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutSpecialFunc( SpecialKey );
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glutDisplayFunc( Display );
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glutIdleFunc( Idle );
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glutMainLoop();
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return 0;
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}
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