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test for GL_NV_texture_rectangle
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Brian Paul
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297
progs/tests/texrect.c
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297
progs/tests/texrect.c
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/* $Id: texrect.c,v 1.1 2002/06/15 03:08:19 brianp Exp $ */
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/* GL_NV_texture_rectangle test
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*
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* Brian Paul
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* 14 June 2002
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*/
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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 "readtex.c" /* I know, this is a hack. */
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#define TEXTURE_0_FILE "../images/girl.rgb"
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#define TEXTURE_1_FILE "../images/reflect.rgb"
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#define TEX0 1
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#define TEX7 8
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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 GLint NumUnits = 2;
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static GLboolean TexEnabled[8];
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static GLint Width[8], Height[8]; /* image sizes */
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static GLenum Format[8];
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static GLfloat Xrot = 00.0, Yrot = 00.0, Zrot = 0.0;
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static void Idle( void )
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{
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Zrot += 1.0;
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glutPostRedisplay();
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}
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static void DrawObject(void)
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{
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GLint i;
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GLfloat d = 0; /* set this >0 to test clamping */
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glColor3f(.1, .1, .1); /* modulate this */
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glPushMatrix();
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glRotatef(Zrot, 0, 0, 1);
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glBegin(GL_QUADS);
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for (i = 0; i < NumUnits; i++)
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, -d, -d);
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glVertex2f(-1.0, -1.0);
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for (i = 0; i < NumUnits; i++)
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, Width[i]+d, -3);
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glVertex2f(1.0, -1.0);
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for (i = 0; i < NumUnits; i++)
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, Width[i]+d, Height[i]+3);
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glVertex2f(1.0, 1.0);
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for (i = 0; i < NumUnits; i++)
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, -d, Height[i]+d);
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glVertex2f(-1.0, 1.0);
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glEnd();
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glPopMatrix();
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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, 5.0, 100.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -35.0 );
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}
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static void ModeMenu(int entry)
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{
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if (entry >= TEX0 && entry < TEX0 + NumUnits) {
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/* toggle */
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GLint i = entry - TEX0;
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TexEnabled[i] = !TexEnabled[i];
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glActiveTextureARB(GL_TEXTURE0_ARB + i);
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if (TexEnabled[i]) {
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glEnable(GL_TEXTURE_RECTANGLE_NV);
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}
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else {
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glDisable(GL_TEXTURE_RECTANGLE_NV);
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}
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printf("Enabled: ");
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for (i = 0; i < NumUnits; i++)
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printf("%d ", (int) TexEnabled[i]);
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printf("\n");
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}
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else if (entry==ANIMATE) {
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Animate = !Animate;
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if (Animate)
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glutIdleFunc(Idle);
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else
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glutIdleFunc(NULL);
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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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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 Init( int argc, char *argv[] )
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{
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GLuint texObj[8];
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GLint size, i;
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if (!glutExtensionSupported("GL_ARB_multitexture")) {
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printf("Sorry, GL_ARB_multitexture needed by this program\n");
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exit(1);
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}
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if (!glutExtensionSupported("GL_NV_texture_rectangle")) {
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printf("Sorry, GL_NV_texture_rectangle needed by this program\n");
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exit(1);
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}
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glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &NumUnits);
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printf("%d texture units supported, using 2.\n", NumUnits);
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if (NumUnits > 2)
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NumUnits = 2;
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glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_NV, &size);
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printf("%d x %d max texture rectangle size\n", size, size);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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for (i = 0; i < NumUnits; i++) {
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TexEnabled[i] = GL_TRUE;
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}
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/* allocate two texture objects */
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glGenTextures(NumUnits, texObj);
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/* setup the texture objects */
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for (i = 0; i < NumUnits; i++) {
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glActiveTextureARB(GL_TEXTURE0_ARB + i);
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glBindTexture(GL_TEXTURE_RECTANGLE_NV, texObj[i]);
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glTexParameteri(GL_TEXTURE_RECTANGLE_NV,
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GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_RECTANGLE_NV,
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GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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if (i == 0) {
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GLubyte *img = LoadRGBImage(TEXTURE_0_FILE, &Width[0], &Height[0],
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&Format[0]);
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if (!img) {
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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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printf("Texture %d: %s (%d x %d)\n", i,
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TEXTURE_0_FILE, Width[0], Height[0]);
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glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGB,
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Width[0], Height[0], 0,
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Format[0], GL_UNSIGNED_BYTE, img);
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}
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else {
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GLubyte *img = LoadRGBImage(TEXTURE_1_FILE, &Width[1], &Height[1],
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&Format[1]);
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if (!img) {
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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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printf("Texture %d: %s (%d x %d)\n", i,
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TEXTURE_1_FILE, Width[1], Height[1]);
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glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGB,
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Width[1], Height[1], 0,
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Format[1], GL_UNSIGNED_BYTE, img);
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}
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if (i < 1)
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
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else
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
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if (TexEnabled[i])
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glEnable(GL_TEXTURE_RECTANGLE_NV);
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}
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glShadeModel(GL_FLAT);
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glClearColor(0.3, 0.3, 0.4, 1.0);
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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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GLint i;
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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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if (Animate)
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glutIdleFunc( Idle );
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glutCreateMenu(ModeMenu);
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for (i = 0; i < NumUnits; i++) {
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char s[100];
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sprintf(s, "Toggle Texture %d", i);
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glutAddMenuEntry(s, TEX0 + i);
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}
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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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