/* * 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/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)); 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("First Tri") == GL_FALSE) { exit(1); } Init(); glutReshapeFunc(Reshape); glutKeyboardFunc(Key); glutDisplayFunc(Draw); glutMainLoop(); return 0; }