Initial revision
This commit is contained in:
jtg
289
progs/demos/texobj.c
Normal file
289
progs/demos/texobj.c
Normal file
@@ -0,0 +1,289 @@
|
||||
/* $Id: texobj.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
|
||||
|
||||
/*
|
||||
* Example of using the 1.1 texture object functions.
|
||||
* Also, this demo utilizes Mesa's fast texture map path.
|
||||
*
|
||||
* Brian Paul June 1996 This file is in the public domain.
|
||||
*/
|
||||
|
||||
|
||||
/*
|
||||
* $Log: texobj.c,v $
|
||||
* Revision 1.1 1999/08/19 00:55:40 jtg
|
||||
* Initial revision
|
||||
*
|
||||
* Revision 3.1 1999/03/28 18:24:37 brianp
|
||||
* minor clean-up
|
||||
*
|
||||
* Revision 3.0 1998/02/14 18:42:29 brianp
|
||||
* initial rev
|
||||
*
|
||||
*/
|
||||
|
||||
|
||||
#include <math.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include "GL/glut.h"
|
||||
|
||||
static GLuint Window = 0;
|
||||
|
||||
static GLuint TexObj[2];
|
||||
static GLfloat Angle = 0.0f;
|
||||
static GLboolean HaveTexObj = GL_FALSE;
|
||||
|
||||
|
||||
#if defined(GL_VERSION_1_1)
|
||||
# define TEXTURE_OBJECT 1
|
||||
#elif defined(GL_EXT_texture_object)
|
||||
# define TEXTURE_OBJECT 1
|
||||
# define glBindTexture(A,B) glBindTextureEXT(A,B)
|
||||
# define glGenTextures(A,B) glGenTexturesEXT(A,B)
|
||||
# define glDeleteTextures(A,B) glDeleteTexturesEXT(A,B)
|
||||
#endif
|
||||
|
||||
|
||||
|
||||
|
||||
static void draw( void )
|
||||
{
|
||||
glDepthFunc(GL_EQUAL);
|
||||
/* glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );*/
|
||||
glClear( GL_COLOR_BUFFER_BIT );
|
||||
|
||||
glColor3f( 1.0, 1.0, 1.0 );
|
||||
|
||||
/* draw first polygon */
|
||||
glPushMatrix();
|
||||
glTranslatef( -1.0, 0.0, 0.0 );
|
||||
glRotatef( Angle, 0.0, 0.0, 1.0 );
|
||||
if (HaveTexObj) {
|
||||
#ifdef TEXTURE_OBJECT
|
||||
glBindTexture( GL_TEXTURE_2D, TexObj[0] );
|
||||
#endif
|
||||
}
|
||||
else {
|
||||
glCallList( TexObj[0] );
|
||||
}
|
||||
glBegin( GL_POLYGON );
|
||||
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 );
|
||||
glEnd();
|
||||
glPopMatrix();
|
||||
|
||||
/* draw second polygon */
|
||||
glPushMatrix();
|
||||
glTranslatef( 1.0, 0.0, 0.0 );
|
||||
glRotatef( Angle-90.0, 0.0, 1.0, 0.0 );
|
||||
if (HaveTexObj) {
|
||||
#ifdef TEXTURE_OBJECT
|
||||
glBindTexture( GL_TEXTURE_2D, TexObj[1] );
|
||||
#endif
|
||||
}
|
||||
else {
|
||||
glCallList( TexObj[0] );
|
||||
}
|
||||
glBegin( GL_POLYGON );
|
||||
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 );
|
||||
glEnd();
|
||||
glPopMatrix();
|
||||
|
||||
glutSwapBuffers();
|
||||
}
|
||||
|
||||
|
||||
|
||||
static void idle( void )
|
||||
{
|
||||
Angle += 2.0;
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
|
||||
|
||||
/* change view Angle, exit upon ESC */
|
||||
static void key(unsigned char k, int x, int y)
|
||||
{
|
||||
(void) x;
|
||||
(void) y;
|
||||
switch (k) {
|
||||
case 27:
|
||||
#ifdef TEXTURE_OBJECT
|
||||
glDeleteTextures( 2, TexObj );
|
||||
#endif
|
||||
glutDestroyWindow(Window);
|
||||
exit(0);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
/* new window size or exposure */
|
||||
static void reshape( int width, int height )
|
||||
{
|
||||
glViewport(0, 0, (GLint)width, (GLint)height);
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glLoadIdentity();
|
||||
/* glOrtho( -3.0, 3.0, -3.0, 3.0, -10.0, 10.0 );*/
|
||||
glFrustum( -2.0, 2.0, -2.0, 2.0, 6.0, 20.0 );
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
glLoadIdentity();
|
||||
glTranslatef( 0.0, 0.0, -8.0 );
|
||||
}
|
||||
|
||||
|
||||
static void init( void )
|
||||
{
|
||||
static int width=8, height=8;
|
||||
static GLubyte tex1[] = {
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0 };
|
||||
|
||||
static GLubyte tex2[] = {
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 2, 2, 0, 0, 0,
|
||||
0, 0, 2, 0, 0, 2, 0, 0,
|
||||
0, 0, 0, 0, 0, 2, 0, 0,
|
||||
0, 0, 0, 0, 2, 0, 0, 0,
|
||||
0, 0, 0, 2, 0, 0, 0, 0,
|
||||
0, 0, 2, 2, 2, 2, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0 };
|
||||
|
||||
GLubyte tex[64][3];
|
||||
GLint i, j;
|
||||
|
||||
|
||||
glDisable( GL_DITHER );
|
||||
|
||||
/* Setup texturing */
|
||||
glEnable( GL_TEXTURE_2D );
|
||||
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
|
||||
glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST );
|
||||
|
||||
|
||||
/* generate texture object IDs */
|
||||
if (HaveTexObj) {
|
||||
#ifdef TEXTURE_OBJECT
|
||||
glGenTextures( 2, TexObj );
|
||||
#endif
|
||||
}
|
||||
else {
|
||||
TexObj[0] = glGenLists(2);
|
||||
TexObj[1] = TexObj[0]+1;
|
||||
}
|
||||
|
||||
/* setup first texture object */
|
||||
if (HaveTexObj) {
|
||||
#ifdef TEXTURE_OBJECT
|
||||
glBindTexture( GL_TEXTURE_2D, TexObj[0] );
|
||||
#endif
|
||||
}
|
||||
else {
|
||||
glNewList( TexObj[0], GL_COMPILE );
|
||||
}
|
||||
/* red on white */
|
||||
for (i=0;i<height;i++) {
|
||||
for (j=0;j<width;j++) {
|
||||
int p = i*width+j;
|
||||
if (tex1[(height-i-1)*width+j]) {
|
||||
tex[p][0] = 255; tex[p][1] = 0; tex[p][2] = 0;
|
||||
}
|
||||
else {
|
||||
tex[p][0] = 255; tex[p][1] = 255; tex[p][2] = 255;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
glTexImage2D( GL_TEXTURE_2D, 0, 3, width, height, 0,
|
||||
GL_RGB, GL_UNSIGNED_BYTE, tex );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
|
||||
if (!HaveTexObj) {
|
||||
glEndList();
|
||||
}
|
||||
/* end of texture object */
|
||||
|
||||
/* setup second texture object */
|
||||
if (HaveTexObj) {
|
||||
#ifdef TEXTURE_OBJECT
|
||||
glBindTexture( GL_TEXTURE_2D, TexObj[1] );
|
||||
#endif
|
||||
}
|
||||
else {
|
||||
glNewList( TexObj[1], GL_COMPILE );
|
||||
}
|
||||
/* green on blue */
|
||||
for (i=0;i<height;i++) {
|
||||
for (j=0;j<width;j++) {
|
||||
int p = i*width+j;
|
||||
if (tex2[(height-i-1)*width+j]) {
|
||||
tex[p][0] = 0; tex[p][1] = 255; tex[p][2] = 0;
|
||||
}
|
||||
else {
|
||||
tex[p][0] = 0; tex[p][1] = 0; tex[p][2] = 255;
|
||||
}
|
||||
}
|
||||
}
|
||||
glTexImage2D( GL_TEXTURE_2D, 0, 3, width, height, 0,
|
||||
GL_RGB, GL_UNSIGNED_BYTE, tex );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
|
||||
if (!HaveTexObj) {
|
||||
glEndList();
|
||||
}
|
||||
/* end texture object */
|
||||
|
||||
}
|
||||
|
||||
|
||||
|
||||
int main( int argc, char *argv[] )
|
||||
{
|
||||
glutInitWindowPosition(0, 0);
|
||||
glutInitWindowSize(300, 300);
|
||||
glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
|
||||
|
||||
Window = glutCreateWindow("Texture Objects");
|
||||
if (!Window) {
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/* check that renderer has the GL_EXT_texture_object extension
|
||||
* or supports OpenGL 1.1
|
||||
*/
|
||||
#ifdef TEXTURE_OBJECT
|
||||
{
|
||||
char *exten = (char *) glGetString( GL_EXTENSIONS );
|
||||
char *version = (char *) glGetString( GL_VERSION );
|
||||
if ( strstr( exten, "GL_EXT_texture_object" )
|
||||
|| strncmp( version, "1.1", 3 )==0 ) {
|
||||
HaveTexObj = GL_TRUE;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
init();
|
||||
|
||||
glutReshapeFunc( reshape );
|
||||
glutKeyboardFunc( key );
|
||||
glutIdleFunc( idle );
|
||||
glutDisplayFunc( draw );
|
||||
glutMainLoop();
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user