375 lines
8.5 KiB
C
375 lines
8.5 KiB
C
|
|
/*
|
|
* Test multitexture and paletted textures.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stddef.h> /* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
|
|
#ifdef _WIN32
|
|
#include <windows.h>
|
|
#endif
|
|
#define GL_GLEXT_LEGACY
|
|
#include <GL/glew.h>
|
|
#include <GL/glut.h>
|
|
|
|
#include "../util/readtex.c" /* I know, this is a hack. */
|
|
|
|
#define TEXTURE_1_FILE "../images/tile.rgb"
|
|
#define TEXTURE_2_FILE "../images/reflect.rgb"
|
|
|
|
#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 void Idle( void )
|
|
{
|
|
if (Animate) {
|
|
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);
|
|
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);
|
|
|
|
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 0.0);
|
|
glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
|
|
glVertex2f(1.0, -1.0);
|
|
|
|
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 2.0);
|
|
glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
|
|
glVertex2f(1.0, 1.0);
|
|
|
|
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);
|
|
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_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 Key( unsigned char key, int x, int y )
|
|
{
|
|
(void) x;
|
|
(void) y;
|
|
switch (key) {
|
|
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 load_tex(const char *fname, int channel)
|
|
{
|
|
GLubyte *image;
|
|
GLenum format;
|
|
GLint w, h;
|
|
GLubyte *grayImage;
|
|
int i;
|
|
GLubyte table[256][4];
|
|
|
|
image = LoadRGBImage(fname, &w, &h, &format);
|
|
if (!image)
|
|
exit(1);
|
|
|
|
printf("%s %d x %d\n", fname, w, h);
|
|
grayImage = malloc(w * h * 1);
|
|
assert(grayImage);
|
|
for (i = 0; i < w * h; i++) {
|
|
int g = (image[i*3+0] + image[i*3+1] + image[i*3+2]) / 3;
|
|
assert(g < 256);
|
|
grayImage[i] = g;
|
|
}
|
|
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_COLOR_INDEX, w, h, 0, GL_COLOR_INDEX,
|
|
GL_UNSIGNED_BYTE, grayImage);
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
table[i][0] = channel ? i : 0;
|
|
table[i][1] = i;
|
|
table[i][2] = channel ? 0 : i;
|
|
table[i][3] = 255;
|
|
}
|
|
|
|
glColorTableEXT(GL_TEXTURE_2D, /* target */
|
|
GL_RGBA, /* internal format */
|
|
256, /* table size */
|
|
GL_RGBA, /* table format */
|
|
GL_UNSIGNED_BYTE, /* table type */
|
|
table); /* the color table */
|
|
|
|
free(grayImage);
|
|
free(image);
|
|
}
|
|
|
|
|
|
|
|
static void Init( int argc, char *argv[] )
|
|
{
|
|
GLuint texObj[2];
|
|
GLint units;
|
|
|
|
if (!glutExtensionSupported("GL_ARB_multitexture")) {
|
|
printf("Sorry, GL_ARB_multitexture not supported by this renderer.\n");
|
|
exit(1);
|
|
}
|
|
if (!glutExtensionSupported("GL_EXT_paletted_texture")) {
|
|
printf("Sorry, GL_EXT_paletted_texture not supported by this renderer.\n");
|
|
exit(1);
|
|
}
|
|
|
|
glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &units);
|
|
printf("%d texture units supported\n", units);
|
|
|
|
/* 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);
|
|
foo
|
|
#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);
|
|
|
|
load_tex(TEXTURE_1_FILE, 0);
|
|
#if 0
|
|
if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) {
|
|
printf("Error: couldn't load texture image\n");
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
/* 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);
|
|
foo
|
|
#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);
|
|
|
|
load_tex(TEXTURE_2_FILE, 1);
|
|
#if 0
|
|
if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) {
|
|
printf("Error: couldn't load texture image\n");
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
/* now bind the texture objects to the respective texture units */
|
|
#ifdef GL_ARB_multitexture
|
|
glActiveTextureARB(GL_TEXTURE0_ARB);
|
|
glBindTexture(GL_TEXTURE_2D, texObj[0]);
|
|
glActiveTextureARB(GL_TEXTURE1_ARB);
|
|
glBindTexture(GL_TEXTURE_2D, texObj[1]);
|
|
#endif
|
|
|
|
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));
|
|
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
|
|
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
|
|
}
|
|
}
|
|
|
|
|
|
int main( int argc, char *argv[] )
|
|
{
|
|
glutInit( &argc, argv );
|
|
glutInitWindowSize( 300, 300 );
|
|
glutInitWindowPosition( 0, 0 );
|
|
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
|
|
glutCreateWindow(argv[0] );
|
|
glewInit();
|
|
|
|
Init( argc, argv );
|
|
|
|
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;
|
|
}
|