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- /* $Id: multitex.c,v 3.2 1998/04/01 02:57:49 brianp Exp $ */
-
- /*
- * Multitexture demo
- * Brian Paul February 1998 This program is in the public domain.
- */
-
- /*
- * $Log: multitex.c,v $
- * Revision 3.2 1998/04/01 02:57:49 brianp
- * added extension test in Init()
- *
- * Revision 3.1 1998/02/21 00:59:17 brianp
- * changed background color
- *
- * Revision 3.0 1998/02/20 04:42:06 brianp
- * initial rev
- *
- */
-
-
- #include <math.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <GL/glut.h>
-
- #include "../util/readtex.c" /* I know, this is a hack. */
-
-
- #define TEX0 1
- #define TEX1 2
- #define TEXBOTH 3
- #define ANIMATE 10
- #define QUIT 100
-
- static GLboolean Animate = GL_TRUE;
-
- static GLfloat Drift = 0.0;
- static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0;
- static GLfloat DXrot = 1.0, DYrot = 2.5;
-
-
- static void Idle( void )
- {
- if (Animate) {
- Drift += 0.05;
-
- #ifdef GL_SGIS_multitexture
- glSelectTextureSGIS(GL_TEXTURE0_SGIS);
- #endif
- glMatrixMode(GL_TEXTURE);
- glLoadIdentity();
- glTranslatef(Drift, 0.0, 0.0);
- glMatrixMode(GL_MODELVIEW);
-
- #ifdef GL_SGIS_multitexture
- glSelectTextureSGIS(GL_TEXTURE1_SGIS);
- #endif
- glMatrixMode(GL_TEXTURE);
- glLoadIdentity();
- glTranslatef(0.0, Drift, 0.0);
- glMatrixMode(GL_MODELVIEW);
-
- glutPostRedisplay();
- }
- }
-
-
- static void DrawObject(void)
- {
- glBegin(GL_QUADS);
-
- #ifdef GL_SGIS_multitexture
- glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 0.0, 0.0);
- glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 0.0, 0.0);
- glVertex2f(-1.0, -1.0);
-
- glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 2.0, 0.0);
- glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 1.0, 0.0);
- glVertex2f(1.0, -1.0);
-
- glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 2.0, 2.0);
- glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 1.0, 1.0);
- glVertex2f(1.0, 1.0);
-
- glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 0.0, 2.0);
- glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 0.0, 1.0);
- glVertex2f(-1.0, 1.0);
- #else
- glTexCoord2f(0.0, 0.0);
- glVertex2f(-1.0, -1.0);
-
- glTexCoord2f(1.0, 0.0);
- glVertex2f(1.0, -1.0);
-
- glTexCoord2f(1.0, 1.0);
- glVertex2f(1.0, 1.0);
-
- glTexCoord2f(0.0, 1.0);
- glVertex2f(-1.0, 1.0);
- #endif
-
- glEnd();
- }
-
-
-
- static void Display( void )
- {
- glClear( GL_COLOR_BUFFER_BIT );
-
- glPushMatrix();
- glRotatef(Xrot, 1.0, 0.0, 0.0);
- glRotatef(Yrot, 0.0, 1.0, 0.0);
- glRotatef(Zrot, 0.0, 0.0, 1.0);
- glScalef(5.0, 5.0, 5.0);
- DrawObject();
- 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, 10.0, 100.0 );
- /*glOrtho( -6.0, 6.0, -6.0, 6.0, 10.0, 100.0 );*/
- glMatrixMode( GL_MODELVIEW );
- glLoadIdentity();
- glTranslatef( 0.0, 0.0, -70.0 );
- }
-
-
- static void ModeMenu(int entry)
- {
- GLboolean enable0 = GL_FALSE, enable1 = GL_FALSE;
- if (entry==TEX0) {
- enable0 = GL_TRUE;
- }
- else if (entry==TEX1) {
- enable1 = GL_TRUE;
- }
- else if (entry==TEXBOTH) {
- enable0 = GL_TRUE;
- enable1 = GL_TRUE;
- }
- else if (entry==ANIMATE) {
- Animate = !Animate;
- }
- else if (entry==QUIT) {
- exit(0);
- }
-
- if (entry != ANIMATE) {
- #ifdef GL_SGIS_multitexture
- glSelectTextureSGIS(GL_TEXTURE0_SGIS);
- #endif
- if (enable0) {
- glEnable(GL_TEXTURE_2D);
- }
- else
- glDisable(GL_TEXTURE_2D);
-
- #ifdef GL_SGIS_multitexture
- glSelectTextureSGIS(GL_TEXTURE1_SGIS);
- #endif
- if (enable1) {
- glEnable(GL_TEXTURE_2D);
- }
- else
- glDisable(GL_TEXTURE_2D);
- }
-
- glutPostRedisplay();
- }
-
-
- static void Key( unsigned char key, int x, int y )
- {
- switch (key) {
- case 27:
- exit(0);
- break;
- }
- glutPostRedisplay();
- }
-
-
- static void SpecialKey( int key, int x, int y )
- {
- float step = 3.0;
-
- switch (key) {
- case GLUT_KEY_UP:
- Xrot += step;
- break;
- case GLUT_KEY_DOWN:
- Xrot -= step;
- break;
- case GLUT_KEY_LEFT:
- Yrot += step;
- break;
- case GLUT_KEY_RIGHT:
- Yrot -= step;
- break;
- }
- glutPostRedisplay();
- }
-
-
- static void Init( void )
- {
- const char *exten = (const char *) glGetString(GL_EXTENSIONS);
- if (!strstr(exten, "GL_SGIS_multitexture")) {
- printf("Sorry, GL_SGIS_multitexture not supported by this renderer.\n");
- exit(1);
- }
-
- /* setup textur env 0 */
- #ifdef GL_SGIS_multitexture
- glSelectTextureSGIS(GL_TEXTURE0_SGIS);
- #endif
- #ifdef LINEAR_FILTER
- /* linear filtering looks much nicer but is much slower for Mesa */
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- #else
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- #endif
-
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-
- if (!LoadRGBMipmaps("girl.rgb", GL_RGB)) {
- printf("Error: couldn't load texture image\n");
- exit(1);
- }
-
-
- /* setup textur env 1 */
- #ifdef GL_SGIS_multitexture
- glSelectTextureSGIS(GL_TEXTURE1_SGIS);
- #endif
- #ifdef LINEAR_FILTER
- /* linear filtering looks much nicer but is much slower for Mesa */
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- #else
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- #endif
-
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-
- if (!LoadRGBMipmaps("reflect.rgb", GL_RGB)) {
- printf("Error: couldn't load texture image\n");
- exit(1);
- }
-
- glShadeModel(GL_FLAT);
- glClearColor(0.3, 0.3, 0.4, 1.0);
-
- ModeMenu(TEXBOTH);
- }
-
-
- int main( int argc, char *argv[] )
- {
- glutInit( &argc, argv );
- glutInitWindowSize( 300, 300 );
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
- glutCreateWindow(argv[0] );
-
- Init();
-
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutSpecialFunc( SpecialKey );
- glutDisplayFunc( Display );
- glutIdleFunc( Idle );
-
- glutCreateMenu(ModeMenu);
- glutAddMenuEntry("Texture 0", TEX0);
- glutAddMenuEntry("Texture 1", TEX1);
- glutAddMenuEntry("Multi-texture", TEXBOTH);
- glutAddMenuEntry("Toggle Animation", ANIMATE);
- glutAddMenuEntry("Quit", QUIT);
- glutAttachMenu(GLUT_RIGHT_BUTTON);
-
- glutMainLoop();
- return 0;
- }
-