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Figure 70
===============
Note: The two square numbers keep flipping.
===============
/*
//Author: Cheikh Drame
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*/
// TextNumber.cpp : Defines the entry point for the console application.
//
/* texobj.c */
/*
* Example of using the 1.1 texture object functions.
* Also, this demo utilizes Mesa's fast texture map path.
*
* Brian Paul June 1996
*/
/* Conversion to GLUT by Mark J. Kilgard */
#include
#include
#include
#include
#include
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)
{
/* 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();
}
/* exit upon ESC */
/* ARGSUSED1 */
static void
key(unsigned char k, int x, int y)
{
switch (k) {
case 27: /* Escape */
#ifdef TEXTURE_OBJECT
glDeleteTextures(2, TexObj);
#endif
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 */
}
void
visible(int vis)
{
if (vis == GLUT_VISIBLE)
glutIdleFunc(idle);
else
glutIdleFunc(NULL);
}
int main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
glutCreateWindow("Texture Objects by irap123.com");
/* 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
if (!HaveTexObj) {
printf("\nThis program doesn't really work the way it is supposed\n");
printf("to if you lack OpenGL 1.1 or the EXT_texture_object extension.\n");
printf("Each textured object should have a different numbered image.\n\n");
}
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(key);
glutVisibilityFunc(visible);
glutDisplayFunc(draw);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
