182 lines
4.4 KiB
C
182 lines
4.4 KiB
C
/*
|
|
* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and
|
|
* its documentation for any purpose is hereby granted without fee, provided
|
|
* that (i) the above copyright notices and this permission notice appear in
|
|
* all copies of the software and related documentation, and (ii) the name of
|
|
* Silicon Graphics may not be used in any advertising or
|
|
* publicity relating to the software without the specific, prior written
|
|
* permission of Silicon Graphics.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
|
|
* ANY KIND,
|
|
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
|
|
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
|
|
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
|
|
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
|
|
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
|
|
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
|
|
* OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <GL/glew.h>
|
|
#include <GL/glut.h>
|
|
|
|
|
|
#define CI_OFFSET_1 16
|
|
#define CI_OFFSET_2 32
|
|
|
|
GLfloat z= 0;
|
|
GLenum doubleBuffer;
|
|
|
|
static void Init(void)
|
|
{
|
|
fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
|
|
fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
|
|
fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
|
|
fflush(stderr);
|
|
|
|
glClearColor(0.0, 0.0, 1.0, 0.0);
|
|
|
|
#define SIZE 16
|
|
{
|
|
GLubyte tex3d[SIZE][SIZE][SIZE][3];
|
|
GLint r, s, t;
|
|
|
|
for (s = 0; s < SIZE; s++) {
|
|
for (t = 0; t < SIZE; t++) {
|
|
for (r = 0; r < SIZE; r++) {
|
|
#if 0
|
|
tex3d[r][t][s][0] = (s < SIZE/2) ? 0 : 255;
|
|
tex3d[r][t][s][1] = (t < SIZE/2) ? 0 : 255;
|
|
tex3d[r][t][s][2] = (r < SIZE/2) ? 0 : 255;
|
|
#else
|
|
tex3d[r][t][s][0] = s*255/(SIZE-1);
|
|
tex3d[r][t][s][1] = t*255/(SIZE-1);
|
|
tex3d[r][t][s][2] = r*255/(SIZE-1);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
|
glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
|
|
glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
glTexImage3D(GL_TEXTURE_3D, 0, 3, SIZE, SIZE, SIZE, 0,
|
|
GL_RGB, GL_UNSIGNED_BYTE, tex3d);
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
|
|
glEnable(GL_TEXTURE_3D);
|
|
}
|
|
|
|
}
|
|
|
|
static void Reshape(int width, int height)
|
|
{
|
|
|
|
glViewport(0, 0, (GLint)width, (GLint)height);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
}
|
|
|
|
static void Key(unsigned char key, int x, int y)
|
|
{
|
|
|
|
switch (key) {
|
|
case ' ':
|
|
z += 1.0/SIZE;
|
|
break;
|
|
case 27:
|
|
exit(1);
|
|
default:
|
|
return;
|
|
}
|
|
|
|
glutPostRedisplay();
|
|
}
|
|
|
|
static void Draw(void)
|
|
{
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
fprintf(stderr, "z: %f\n", z);
|
|
|
|
glBegin(GL_QUADS);
|
|
glTexCoord3f(1,0,z);
|
|
glVertex3f( 0.9, -0.9, -30.0);
|
|
glTexCoord3f(1,1,z);
|
|
glVertex3f( 0.9, 0.9, -30.0);
|
|
glTexCoord3f(0,1,z);
|
|
glVertex3f(-0.9, 0.9, -30.0);
|
|
glTexCoord3f(0,0,z);
|
|
glVertex3f(-0.9, -0.9, -30.0);
|
|
glEnd();
|
|
|
|
glFlush();
|
|
|
|
if (doubleBuffer) {
|
|
glutSwapBuffers();
|
|
}
|
|
}
|
|
|
|
static GLenum Args(int argc, char **argv)
|
|
{
|
|
GLint i;
|
|
|
|
doubleBuffer = GL_FALSE;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
if (strcmp(argv[i], "-sb") == 0) {
|
|
doubleBuffer = GL_FALSE;
|
|
} else if (strcmp(argv[i], "-db") == 0) {
|
|
doubleBuffer = GL_TRUE;
|
|
} else {
|
|
fprintf(stderr, "%s (Bad option).\n", argv[i]);
|
|
return GL_FALSE;
|
|
}
|
|
}
|
|
return GL_TRUE;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
GLenum type;
|
|
|
|
glutInit(&argc, argv);
|
|
|
|
if (Args(argc, argv) == GL_FALSE) {
|
|
exit(1);
|
|
}
|
|
|
|
glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
|
|
|
|
type = GLUT_RGB | GLUT_ALPHA;
|
|
type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
|
|
glutInitDisplayMode(type);
|
|
|
|
if (glutCreateWindow(*argv) == GL_FALSE) {
|
|
exit(1);
|
|
}
|
|
|
|
glewInit();
|
|
|
|
Init();
|
|
|
|
glutReshapeFunc(Reshape);
|
|
glutKeyboardFunc(Key);
|
|
glutDisplayFunc(Draw);
|
|
glutMainLoop();
|
|
return 0;
|
|
}
|