-/* $Id: multiarb.c,v 1.10 2001/06/20 19:12:30 brianp Exp $ */
+/* $Id: multiarb.c,v 1.11 2002/02/13 02:23:33 brianp Exp $ */
/*
* GL_ARB_multitexture demo
*
*
* Brian Paul November 1998 This program is in the public domain.
- */
-
-/*
- * $Log: multiarb.c,v $
- * Revision 1.10 2001/06/20 19:12:30 brianp
- * also print GL_MAX_TEXTURE_SIZE
- *
- * Revision 1.9 2001/06/13 14:33:16 brianp
- * moved glTexEnvi calls to better logical locations
- *
- * Revision 1.8 2000/12/24 22:53:54 pesco
- * * demos/Makefile.am (INCLUDES): Added -I$(top_srcdir)/util.
- * * demos/Makefile.X11, demos/Makefile.BeOS-R4, demos/Makefile.cygnus:
- * Essentially the same.
- * Program files updated to include "readtex.c", not "../util/readtex.c".
- * * demos/reflect.c: Likewise for "showbuffer.c".
- *
- *
- * * Makefile.am (EXTRA_DIST): Added top-level regular files.
- *
- * * include/GL/Makefile.am (INC_X11): Added glxext.h.
- *
- *
- * * src/GGI/include/ggi/mesa/Makefile.am (EXTRA_HEADERS): Include
- * Mesa GGI headers in dist even if HAVE_GGI is not given.
- *
- * * configure.in: Look for GLUT and demo source dirs in $srcdir.
- *
- * * src/swrast/Makefile.am (libMesaSwrast_la_SOURCES): Set to *.[ch].
- * More source list updates in various Makefile.am's.
- *
- * * Makefile.am (dist-hook): Remove CVS directory from distribution.
- * (DIST_SUBDIRS): List all possible subdirs here.
- * (SUBDIRS): Only list subdirs selected for build again.
- * The above two applied to all subdir Makefile.am's also.
- *
- * Revision 1.7 2000/11/01 16:02:01 brianp
- * print number of texture units
- *
- * Revision 1.6 2000/05/23 23:21:00 brianp
- * set default window pos
- *
- * Revision 1.5 2000/02/02 17:31:45 brianp
- * changed > to >=
- *
- * Revision 1.4 2000/02/02 01:07:21 brianp
- * limit Drift to [0, 1]
- *
- * Revision 1.3 1999/10/21 16:40:32 brianp
- * added -info command line option
- *
- * Revision 1.2 1999/10/13 12:02:13 brianp
- * use texture objects now
- *
- * Revision 1.1.1.1 1999/08/19 00:55:40 jtg
- * Imported sources
- *
- * Revision 1.3 1999/03/28 18:20:49 brianp
- * minor clean-up
- *
- * Revision 1.2 1998/11/05 04:34:04 brianp
- * moved image files to ../images/ directory
- *
- * Revision 1.1 1998/11/03 01:36:33 brianp
- * Initial revision
- *
+ * Modified on 12 Feb 2002 for > 2 texture units.
*/
#define TEXTURE_2_FILE "../images/reflect.rgb"
#define TEX0 1
-#define TEX1 2
-#define TEXBOTH 3
+#define TEX7 8
#define ANIMATE 10
#define QUIT 100
static GLboolean Animate = GL_TRUE;
+static GLint NumUnits = 1;
+static GLboolean TexEnabled[8];
static GLfloat Drift = 0.0;
static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0;
static void Idle( void )
{
if (Animate) {
+ GLint i;
+
Drift += 0.05;
if (Drift >= 1.0)
Drift = 0.0;
-#ifdef GL_ARB_multitexture
- glActiveTextureARB(GL_TEXTURE0_ARB);
-#endif
- glMatrixMode(GL_TEXTURE);
- glLoadIdentity();
- glTranslatef(Drift, 0.0, 0.0);
- glMatrixMode(GL_MODELVIEW);
-
-#ifdef GL_ARB_multitexture
- glActiveTextureARB(GL_TEXTURE1_ARB);
-#endif
- glMatrixMode(GL_TEXTURE);
- glLoadIdentity();
- glTranslatef(0.0, Drift, 0.0);
+ for (i = 0; i < NumUnits; i++) {
+ glActiveTextureARB(GL_TEXTURE0_ARB + i);
+ glMatrixMode(GL_TEXTURE);
+ glLoadIdentity();
+ if (i == 0) {
+ glTranslatef(Drift, 0.0, 0.0);
+ glScalef(2, 2, 2);
+ }
+ else if (i == 1) {
+ glTranslatef(0.0, Drift, 0.0);
+ }
+ else {
+ glTranslatef(0.5, 0.5, 0.0);
+ glRotatef(180.0 * Drift, 0, 0, 1);
+ glScalef(1.0/i, 1.0/i, 1.0/i);
+ glTranslatef(-0.5, -0.5, 0.0);
+ }
+ }
glMatrixMode(GL_MODELVIEW);
glutPostRedisplay();
static void DrawObject(void)
{
- glBegin(GL_QUADS);
-
-#ifdef GL_ARB_multitexture
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
- glVertex2f(-1.0, -1.0);
+ GLint i;
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 0.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
- glVertex2f(1.0, -1.0);
+ if (!TexEnabled[0] && !TexEnabled[1])
+ glColor3f(0.1, 0.1, 0.1); /* add onto this */
+ else
+ glColor3f(1, 1, 1); /* modulate this */
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 2.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
- glVertex2f(1.0, 1.0);
+ glBegin(GL_QUADS);
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 2.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 1.0);
- glVertex2f(-1.0, 1.0);
-#else
- glTexCoord2f(0.0, 0.0);
+ for (i = 0; i < NumUnits; i++)
+ glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 0.0, 0.0);
glVertex2f(-1.0, -1.0);
- glTexCoord2f(1.0, 0.0);
+ for (i = 0; i < NumUnits; i++)
+ glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 1.0, 0.0);
glVertex2f(1.0, -1.0);
- glTexCoord2f(1.0, 1.0);
+ for (i = 0; i < NumUnits; i++)
+ glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 1.0, 1.0);
glVertex2f(1.0, 1.0);
- glTexCoord2f(0.0, 1.0);
+ for (i = 0; i < NumUnits; i++)
+ glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 0.0, 1.0);
glVertex2f(-1.0, 1.0);
-#endif
glEnd();
}
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;
+ if (entry >= TEX0 && entry <= TEX7) {
+ /* toggle */
+ GLint i = entry - TEX0;
+ TexEnabled[i] = !TexEnabled[i];
+ glActiveTextureARB(GL_TEXTURE0_ARB + i);
+ if (TexEnabled[i])
+ glEnable(GL_TEXTURE_2D);
+ else
+ glDisable(GL_TEXTURE_2D);
+ printf("Enabled: ");
+ for (i = 0; i < NumUnits; i++)
+ printf("%d ", (int) TexEnabled[i]);
+ printf("\n");
}
else if (entry==ANIMATE) {
Animate = !Animate;
exit(0);
}
- if (entry != ANIMATE) {
-#ifdef GL_ARB_multitexture
- glActiveTextureARB(GL_TEXTURE0_ARB);
-#endif
- if (enable0) {
- glEnable(GL_TEXTURE_2D);
- }
- else
- glDisable(GL_TEXTURE_2D);
-
-#ifdef GL_ARB_multitexture
- glActiveTextureARB(GL_TEXTURE1_ARB);
-#endif
- if (enable1) {
- glEnable(GL_TEXTURE_2D);
- }
- else
- glDisable(GL_TEXTURE_2D);
- }
-
glutPostRedisplay();
}
static void Init( int argc, char *argv[] )
{
- GLuint texObj[2];
- GLint units, size;
+ GLuint texObj[8];
+ GLint size, i;
const char *exten = (const char *) glGetString(GL_EXTENSIONS);
if (!strstr(exten, "GL_ARB_multitexture")) {
exit(1);
}
- glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &units);
- printf("%d texture units supported\n", units);
+ glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &NumUnits);
+ printf("%d texture units supported\n", NumUnits);
+ if (NumUnits > 8)
+ NumUnits = 8;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size);
printf("%d x %d max texture size\n", size, size);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- /* allocate two texture objects */
- glGenTextures(2, texObj);
-
- /* setup texture obj 0 */
- glBindTexture(GL_TEXTURE_2D, texObj[0]);
-#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
- if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) {
- printf("Error: couldn't load texture image\n");
- exit(1);
+ for (i = 0; i < NumUnits; i++) {
+ if (i < 2)
+ TexEnabled[i] = GL_TRUE;
+ else
+ TexEnabled[i] = GL_FALSE;
}
+ /* allocate two texture objects */
+ glGenTextures(NumUnits, texObj);
- /* setup texture obj 1 */
- glBindTexture(GL_TEXTURE_2D, texObj[1]);
-#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
- if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) {
- printf("Error: couldn't load texture image\n");
- exit(1);
- }
+ /* setup the texture objects */
+ for (i = 0; i < NumUnits; i++) {
+ glActiveTextureARB(GL_TEXTURE0_ARB + i);
+ glBindTexture(GL_TEXTURE_2D, texObj[i]);
- /* now bind the texture objects to the respective texture units */
-#ifdef GL_ARB_multitexture
- glActiveTextureARB(GL_TEXTURE0_ARB);
- glBindTexture(GL_TEXTURE_2D, texObj[0]);
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- glActiveTextureARB(GL_TEXTURE1_ARB);
- glBindTexture(GL_TEXTURE_2D, texObj[1]);
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-#endif
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+ if (i == 0) {
+ if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) {
+ printf("Error: couldn't load texture image\n");
+ exit(1);
+ }
+ }
+ else if (i == 1) {
+ if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) {
+ printf("Error: couldn't load texture image\n");
+ exit(1);
+ }
+ }
+ else {
+ /* checker */
+ GLubyte image[8][8][3];
+ GLint i, j;
+ for (i = 0; i < 8; i++) {
+ for (j = 0; j < 8; j++) {
+ if ((i + j) & 1) {
+ image[i][j][0] = 50;
+ image[i][j][1] = 50;
+ image[i][j][2] = 50;
+ }
+ else {
+ image[i][j][0] = 25;
+ image[i][j][1] = 25;
+ image[i][j][2] = 25;
+ }
+ }
+ }
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, (GLvoid *) image);
+ }
+
+ /* Bind texObj[i] to ith texture unit */
+ if (i < 2)
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+ else
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
+
+ if (TexEnabled[i])
+ glEnable(GL_TEXTURE_2D);
+ }
glShadeModel(GL_FLAT);
glClearColor(0.3, 0.3, 0.4, 1.0);
- ModeMenu(TEXBOTH);
-
if (argc > 1 && strcmp(argv[1], "-info")==0) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
int main( int argc, char *argv[] )
{
+ GLint i;
+
glutInit( &argc, argv );
glutInitWindowSize( 300, 300 );
glutInitWindowPosition( 0, 0 );
glutIdleFunc( Idle );
glutCreateMenu(ModeMenu);
- glutAddMenuEntry("Texture 0", TEX0);
- glutAddMenuEntry("Texture 1", TEX1);
- glutAddMenuEntry("Multi-texture", TEXBOTH);
+
+ for (i = 0; i < NumUnits; i++) {
+ char s[100];
+ sprintf(s, "Toggle Texture %d", i);
+ glutAddMenuEntry(s, TEX0 + i);
+ }
glutAddMenuEntry("Toggle Animation", ANIMATE);
glutAddMenuEntry("Quit", QUIT);
glutAttachMenu(GLUT_RIGHT_BUTTON);
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