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xenocara/dist/Mesa/progs/tests/texrect.c

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/* $Id: texrect.c,v 1.1 2008/11/02 14:58:09 matthieu Exp $ */
/* GL_NV_texture_rectangle test
*
* Brian Paul
* 14 June 2002
*/
#define GL_GLEXT_PROTOTYPES
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glut.h>
#include "readtex.h"
#define TEXTURE_0_FILE "../images/girl.rgb"
#define TEXTURE_1_FILE "../images/reflect.rgb"
#define TEX0 1
#define TEX7 8
#define ANIMATE 10
#define CLAMP 20
#define CLAMP_TO_EDGE 21
#define CLAMP_TO_BORDER 22
#define LINEAR_FILTER 30
#define NEAREST_FILTER 31
#define QUIT 100
static GLboolean Animate = GL_FALSE;
static GLint NumUnits = 2;
static GLboolean TexEnabled[8];
static GLint Width[8], Height[8]; /* image sizes */
static GLenum Format[8];
static GLfloat Xrot = 00.0, Yrot = 00.0, Zrot = 0.0;
static void Idle( void )
{
Zrot = glutGet(GLUT_ELAPSED_TIME) * 0.01;
glutPostRedisplay();
}
static void DrawObject(void)
{
GLint i;
GLfloat d = 10; /* so we can see how borders are handled */
glColor3f(.1, .1, .1); /* modulate this */
glPushMatrix();
glRotatef(Zrot, 0, 0, 1);
glBegin(GL_QUADS);
for (i = 0; i < NumUnits; i++)
glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, -d, -d);
glVertex2f(-1.0, -1.0);
for (i = 0; i < NumUnits; i++)
glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, Width[i]+d, -d);
glVertex2f(1.0, -1.0);
for (i = 0; i < NumUnits; i++)
glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, Width[i]+d, Height[i]+d);
glVertex2f(1.0, 1.0);
for (i = 0; i < NumUnits; i++)
glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, -d, Height[i]+d);
glVertex2f(-1.0, 1.0);
glEnd();
glPopMatrix();
}
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, 5.0, 100.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0.0, 0.0, -35.0 );
}
static void ModeMenu(int entry)
{
GLint i;
if (entry >= TEX0 && entry < TEX0 + NumUnits) {
/* toggle */
i = entry - TEX0;
TexEnabled[i] = !TexEnabled[i];
glActiveTextureARB(GL_TEXTURE0_ARB + i);
if (TexEnabled[i]) {
glEnable(GL_TEXTURE_RECTANGLE_NV);
}
else {
glDisable(GL_TEXTURE_RECTANGLE_NV);
}
printf("Enabled: ");
for (i = 0; i < NumUnits; i++)
printf("%d ", (int) TexEnabled[i]);
printf("\n");
}
else if (entry==ANIMATE) {
Animate = !Animate;
if (Animate)
glutIdleFunc(Idle);
else
glutIdleFunc(NULL);
}
else if (entry==CLAMP) {
for (i = 0; i < NumUnits; i++) {
glActiveTextureARB(GL_TEXTURE0_ARB + i);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, GL_CLAMP);
}
}
else if (entry==CLAMP_TO_EDGE) {
for (i = 0; i < NumUnits; i++) {
glActiveTextureARB(GL_TEXTURE0_ARB + i);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
}
else if (entry==CLAMP_TO_BORDER) {
for (i = 0; i < NumUnits; i++) {
glActiveTextureARB(GL_TEXTURE0_ARB + i);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
}
}
else if (entry==NEAREST_FILTER) {
for (i = 0; i < NumUnits; i++) {
glActiveTextureARB(GL_TEXTURE0_ARB + i);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
}
else if (entry==LINEAR_FILTER) {
for (i = 0; i < NumUnits; i++) {
glActiveTextureARB(GL_TEXTURE0_ARB + i);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
}
else if (entry==QUIT) {
exit(0);
}
glutPostRedisplay();
}
static void Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 'z':
Zrot -= 1.0;
break;
case 'Z':
Zrot += 1.0;
break;
case 'a':
Animate = !Animate;
if (Animate)
glutIdleFunc(Idle);
else
glutIdleFunc(NULL);
break;
case 27:
exit(0);
break;
}
glutPostRedisplay();
}
static void SpecialKey( int key, int x, int y )
{
float step = 3.0;
(void) x;
(void) y;
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( int argc, char *argv[] )
{
const GLenum wrap = GL_CLAMP;
GLuint texObj[8];
GLint size, i;
if (!glutExtensionSupported("GL_ARB_multitexture")) {
printf("Sorry, GL_ARB_multitexture needed by this program\n");
exit(1);
}
if (!glutExtensionSupported("GL_NV_texture_rectangle")) {
printf("Sorry, GL_NV_texture_rectangle needed by this program\n");
exit(1);
}
glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &NumUnits);
printf("%d texture units supported, using 2.\n", NumUnits);
if (NumUnits > 2)
NumUnits = 2;
glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_NV, &size);
printf("%d x %d max texture rectangle size\n", size, size);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
for (i = 0; i < NumUnits; i++) {
TexEnabled[i] = GL_TRUE;
}
/* allocate two texture objects */
glGenTextures(NumUnits, texObj);
/* setup the texture objects */
for (i = 0; i < NumUnits; i++) {
glActiveTextureARB(GL_TEXTURE0_ARB + i);
glBindTexture(GL_TEXTURE_RECTANGLE_NV, texObj[i]);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV,
GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV,
GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, wrap);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, wrap);
if (i == 0) {
GLubyte *img = LoadRGBImage(TEXTURE_0_FILE, &Width[0], &Height[0],
&Format[0]);
if (!img) {
printf("Error: couldn't load texture image\n");
exit(1);
}
printf("Texture %d: %s (%d x %d)\n", i,
TEXTURE_0_FILE, Width[0], Height[0]);
glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGB,
Width[0], Height[0], 0,
Format[0], GL_UNSIGNED_BYTE, img);
}
else {
GLubyte *img = LoadRGBImage(TEXTURE_1_FILE, &Width[1], &Height[1],
&Format[1]);
if (!img) {
printf("Error: couldn't load texture image\n");
exit(1);
}
printf("Texture %d: %s (%d x %d)\n", i,
TEXTURE_1_FILE, Width[1], Height[1]);
glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGB,
Width[1], Height[1], 0,
Format[1], GL_UNSIGNED_BYTE, img);
}
if (i < 1)
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
else
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
if (TexEnabled[i])
glEnable(GL_TEXTURE_RECTANGLE_NV);
}
glShadeModel(GL_FLAT);
glClearColor(0.3, 0.3, 0.4, 1.0);
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));
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
}
int main( int argc, char *argv[] )
{
GLint i;
glutInit( &argc, argv );
glutInitWindowSize( 300, 300 );
glutInitWindowPosition( 0, 0 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
glutCreateWindow(argv[0] );
Init( argc, argv );
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutSpecialFunc( SpecialKey );
glutDisplayFunc( Display );
if (Animate)
glutIdleFunc( Idle );
glutCreateMenu(ModeMenu);
for (i = 0; i < NumUnits; i++) {
char s[100];
sprintf(s, "Toggle Texture %d", i);
glutAddMenuEntry(s, TEX0 + i);
}
glutAddMenuEntry("Toggle Animation", ANIMATE);
glutAddMenuEntry("GL_CLAMP", CLAMP);
glutAddMenuEntry("GL_CLAMP_TO_EDGE", CLAMP_TO_EDGE);
glutAddMenuEntry("GL_CLAMP_TO_BORDER", CLAMP_TO_BORDER);
glutAddMenuEntry("GL_NEAREST", NEAREST_FILTER);
glutAddMenuEntry("GL_LINEAR", LINEAR_FILTER);
glutAddMenuEntry("Quit", QUIT);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutMainLoop();
return 0;
}
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