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/*
* 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.
*/
/*
* Based on the trivial/quad-tex-2d program.
* Modified by Jakob Bornecrantz <jakob@tungstengraphics.com>
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <GL/glut.h>
static GLenum Target = GL_TEXTURE_2D;
static GLenum Filter = GL_NEAREST;
GLenum doubleBuffer;
static float Rot = 0;
static int win = 0;
static void Init(void)
{
int internalFormat;
int sourceFormat;
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 tex2d[SIZE][SIZE][4];
GLint s, t;
for (s = 0; s < SIZE; s++) {
for (t = 0; t < SIZE; t++) {
tex2d[t][s][0] = 0xff;
tex2d[t][s][1] = 0xff;
tex2d[t][s][2] = 0xff;
tex2d[t][s][3] = 0xff;
}
}
internalFormat = GL_LUMINANCE8;
sourceFormat = GL_RGBA;
glTexImage2D(Target,
0,
internalFormat,
SIZE, SIZE,
0,
sourceFormat,
GL_UNSIGNED_BYTE,
//GL_UNSIGNED_INT,
tex2d);
glEnable(Target);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexParameterf(Target, GL_TEXTURE_WRAP_R, GL_REPEAT);
glTexParameterf(Target, GL_TEXTURE_MIN_FILTER, Filter);
glTexParameterf(Target, GL_TEXTURE_MAG_FILTER, Filter);
}
}
static void Reshape(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
#if 0
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
#else
glFrustum(-1, 1, -1, 1, 10, 20);
#endif
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -15);
}
static void Key(unsigned char key, int x, int y)
{
switch (key) {
case 'r':
Rot += 10.0;
break;
case 'R':
Rot -= 10.0;
break;
case 27:
glutDestroyWindow(win);
exit(0);
default:
return;
}
glutPostRedisplay();
}
static void Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glRotatef(Rot, 0, 1, 0);
glBegin(GL_QUADS);
glTexCoord2f(1,0);
glVertex3f( 0.9, -0.9, 0.0);
glTexCoord2f(1,1);
glVertex3f( 0.9, 0.9, 0.0);
glTexCoord2f(0,1);
glVertex3f(-0.9, 0.9, 0.0);
glTexCoord2f(0,0);
glVertex3f(-0.9, -0.9, 0.0);
glEnd();
glPopMatrix();
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;
type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode(type);
win = glutCreateWindow("Tex test");
if (!win) {
exit(1);
}
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;
}
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