test texture palettes with multitexture
This commit is contained in:
Brian Paul
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/* $Id: multipal.c,v 1.1 2000/11/18 17:12:33 brianp Exp $ */
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/*
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* GL_ARB_multitexture demo
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*
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* Command line options:
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* -info print GL implementation information
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*
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*
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* Brian Paul November 1998 This program is in the public domain.
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*/
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/*
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* $Log: multipal.c,v $
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* Revision 1.1 2000/11/18 17:12:33 brianp
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* test texture palettes with multitexture
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*
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* Revision 1.7 2000/11/01 16:02:01 brianp
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* print number of texture units
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*
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* Revision 1.6 2000/05/23 23:21:00 brianp
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* set default window pos
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*
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* Revision 1.5 2000/02/02 17:31:45 brianp
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* changed > to >=
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*
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* Revision 1.4 2000/02/02 01:07:21 brianp
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* limit Drift to [0, 1]
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*
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* Revision 1.3 1999/10/21 16:40:32 brianp
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* added -info command line option
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*
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* Revision 1.2 1999/10/13 12:02:13 brianp
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* use texture objects now
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*
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* Revision 1.1.1.1 1999/08/19 00:55:40 jtg
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* Imported sources
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*
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* Revision 1.3 1999/03/28 18:20:49 brianp
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* minor clean-up
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*
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* Revision 1.2 1998/11/05 04:34:04 brianp
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* moved image files to ../images/ directory
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*
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* Revision 1.1 1998/11/03 01:36:33 brianp
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* Initial revision
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*
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*/
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#include <assert.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <GL/glut.h>
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#include "../util/readtex.c" /* I know, this is a hack. */
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#define TEXTURE_1_FILE "../images/tile.rgb"
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#define TEXTURE_2_FILE "../images/reflect.rgb"
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#define TEX0 1
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#define TEX1 2
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#define TEXBOTH 3
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#define ANIMATE 10
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#define QUIT 100
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static GLboolean Animate = GL_TRUE;
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static GLfloat Drift = 0.0;
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static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0;
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static void Idle( void )
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{
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if (Animate) {
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Drift += 0.05;
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if (Drift >= 1.0)
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Drift = 0.0;
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#ifdef GL_ARB_multitexture
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glActiveTextureARB(GL_TEXTURE0_ARB);
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#endif
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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glTranslatef(Drift, 0.0, 0.0);
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glMatrixMode(GL_MODELVIEW);
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#ifdef GL_ARB_multitexture
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glActiveTextureARB(GL_TEXTURE1_ARB);
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#endif
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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glTranslatef(0.0, Drift, 0.0);
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glMatrixMode(GL_MODELVIEW);
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glutPostRedisplay();
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}
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}
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static void DrawObject(void)
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{
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glBegin(GL_QUADS);
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#ifdef GL_ARB_multitexture
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
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glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
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glVertex2f(-1.0, -1.0);
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 0.0);
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glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
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glVertex2f(1.0, -1.0);
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 2.0);
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glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
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glVertex2f(1.0, 1.0);
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 2.0);
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glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 1.0);
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glVertex2f(-1.0, 1.0);
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#else
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glTexCoord2f(0.0, 0.0);
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glVertex2f(-1.0, -1.0);
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glTexCoord2f(1.0, 0.0);
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glVertex2f(1.0, -1.0);
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glTexCoord2f(1.0, 1.0);
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glVertex2f(1.0, 1.0);
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glTexCoord2f(0.0, 1.0);
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glVertex2f(-1.0, 1.0);
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#endif
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glEnd();
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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(Xrot, 1.0, 0.0, 0.0);
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glRotatef(Yrot, 0.0, 1.0, 0.0);
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glRotatef(Zrot, 0.0, 0.0, 1.0);
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glScalef(5.0, 5.0, 5.0);
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DrawObject();
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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, 10.0, 100.0 );
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/*glOrtho( -6.0, 6.0, -6.0, 6.0, 10.0, 100.0 );*/
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -70.0 );
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}
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static void ModeMenu(int entry)
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{
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GLboolean enable0 = GL_FALSE, enable1 = GL_FALSE;
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if (entry==TEX0) {
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enable0 = GL_TRUE;
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}
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else if (entry==TEX1) {
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enable1 = GL_TRUE;
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}
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else if (entry==TEXBOTH) {
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enable0 = GL_TRUE;
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enable1 = GL_TRUE;
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}
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else if (entry==ANIMATE) {
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Animate = !Animate;
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}
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else if (entry==QUIT) {
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exit(0);
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}
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if (entry != ANIMATE) {
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#ifdef GL_ARB_multitexture
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glActiveTextureARB(GL_TEXTURE0_ARB);
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#endif
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if (enable0) {
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glEnable(GL_TEXTURE_2D);
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}
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else
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glDisable(GL_TEXTURE_2D);
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#ifdef GL_ARB_multitexture
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glActiveTextureARB(GL_TEXTURE1_ARB);
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#endif
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if (enable1) {
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glEnable(GL_TEXTURE_2D);
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}
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else
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glDisable(GL_TEXTURE_2D);
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}
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glutPostRedisplay();
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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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float step = 3.0;
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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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Xrot += step;
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break;
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case GLUT_KEY_DOWN:
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Xrot -= step;
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break;
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case GLUT_KEY_LEFT:
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Yrot += step;
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break;
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case GLUT_KEY_RIGHT:
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Yrot -= step;
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break;
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}
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glutPostRedisplay();
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}
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static void load_tex(const char *fname, int channel)
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{
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GLubyte *image;
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GLenum format, type;
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GLint w, h;
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GLubyte *grayImage;
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int i;
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GLubyte table[256][4];
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image = LoadRGBImage(fname, &w, &h, &format);
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if (!image)
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exit(1);
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printf("%s %d x %d\n", fname, w, h);
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grayImage = malloc(w * h * 1);
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assert(grayImage);
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for (i = 0; i < w * h; i++) {
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int g = (image[i*3+0] + image[i*3+1] + image[i*3+2]) / 3;
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assert(g < 256);
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grayImage[i] = g;
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}
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glTexImage2D(GL_TEXTURE_2D, 0, GL_COLOR_INDEX, w, h, 0, GL_COLOR_INDEX,
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GL_UNSIGNED_BYTE, grayImage);
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for (i = 0; i < 256; i++) {
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table[i][0] = channel ? i : 0;
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table[i][1] = i;
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table[i][2] = channel ? 0 : i;
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table[i][3] = 255;
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}
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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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free(grayImage);
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free(image);
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}
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static void Init( int argc, char *argv[] )
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{
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GLuint texObj[2];
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GLint units;
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const char *exten = (const char *) glGetString(GL_EXTENSIONS);
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if (!strstr(exten, "GL_ARB_multitexture")) {
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printf("Sorry, GL_ARB_multitexture not supported by this renderer.\n");
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exit(1);
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}
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glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &units);
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printf("%d texture units supported\n", units);
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/* allocate two texture objects */
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glGenTextures(2, texObj);
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/* setup texture obj 0 */
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glBindTexture(GL_TEXTURE_2D, texObj[0]);
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#ifdef LINEAR_FILTER
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/* linear filtering looks much nicer but is much slower for Mesa */
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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foo
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#else
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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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#endif
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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load_tex(TEXTURE_1_FILE, 0);
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#if 0
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if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) {
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printf("Error: couldn't load texture image\n");
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exit(1);
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}
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#endif
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/* setup texture obj 1 */
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glBindTexture(GL_TEXTURE_2D, texObj[1]);
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#ifdef LINEAR_FILTER
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/* linear filtering looks much nicer but is much slower for Mesa */
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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foo
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#else
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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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#endif
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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load_tex(TEXTURE_2_FILE, 1);
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#if 0
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if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) {
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printf("Error: couldn't load texture image\n");
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exit(1);
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}
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#endif
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/* now bind the texture objects to the respective texture units */
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#ifdef GL_ARB_multitexture
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glActiveTextureARB(GL_TEXTURE0_ARB);
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glBindTexture(GL_TEXTURE_2D, texObj[0]);
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glActiveTextureARB(GL_TEXTURE1_ARB);
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glBindTexture(GL_TEXTURE_2D, texObj[1]);
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#endif
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glShadeModel(GL_FLAT);
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glClearColor(0.3, 0.3, 0.4, 1.0);
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ModeMenu(TEXBOTH);
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if (argc > 1 && strcmp(argv[1], "-info")==0) {
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
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printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
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}
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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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glutInitWindowSize( 300, 300 );
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glutInitWindowPosition( 0, 0 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
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glutCreateWindow(argv[0] );
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Init( argc, argv );
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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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glutCreateMenu(ModeMenu);
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glutAddMenuEntry("Texture 0", TEX0);
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glutAddMenuEntry("Texture 1", TEX1);
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glutAddMenuEntry("Multi-texture", TEXBOTH);
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glutAddMenuEntry("Toggle Animation", ANIMATE);
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glutAddMenuEntry("Quit", QUIT);
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glutAttachMenu(GLUT_RIGHT_BUTTON);
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glutMainLoop();
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return 0;
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}
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Block a user