262 lines
6.5 KiB
C
262 lines
6.5 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 NR_VERTS 4
|
|
|
|
struct {
|
|
GLfloat position[NR_VERTS][4];
|
|
GLubyte color[NR_VERTS][4];
|
|
GLfloat tex0[NR_VERTS][2];
|
|
GLfloat tex1[NR_VERTS][2];
|
|
} verts = {
|
|
|
|
{ { 0.9, -0.9, 0.0, 1.0 },
|
|
{ 0.9, 0.9, 0.0, 1.0 },
|
|
{ -0.9, 0.9, 0.0, 1.0 },
|
|
{ -0.9, -0.9, 0.0, 1.0 } },
|
|
|
|
{ { 0x00, 0x00, 0xff, 0x00 },
|
|
{ 0x00, 0xff, 0x00, 0x00 },
|
|
{ 0xff, 0x00, 0x00, 0x00 },
|
|
{ 0xff, 0xff, 0xff, 0x00 }
|
|
},
|
|
|
|
{ { 1, -1 },
|
|
{ 1, 1 },
|
|
{ -1, 1 },
|
|
{ -1, -1 } },
|
|
|
|
{ { 3, 0 },
|
|
{ 0, 3 },
|
|
{ -3, 0 },
|
|
{ 0, -3} },
|
|
|
|
};
|
|
|
|
GLuint indices[] = { 0, 1, 2, 3 };
|
|
|
|
GLuint arrayObj, elementObj;
|
|
|
|
|
|
GLenum doubleBuffer;
|
|
|
|
|
|
#define Offset(ptr, member) (void *)((const char *)&((ptr)->member) - (const char *)(ptr))
|
|
|
|
static void Init(void)
|
|
{
|
|
GLuint texObj[2];
|
|
|
|
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);
|
|
|
|
glGenTextures(2, texObj);
|
|
|
|
#define SIZE 32
|
|
{
|
|
GLubyte tex2d[SIZE][SIZE][3];
|
|
GLint s, t;
|
|
|
|
for (s = 0; s < SIZE; s++) {
|
|
for (t = 0; t < SIZE; t++) {
|
|
tex2d[t][s][0] = s*255/(SIZE-1);
|
|
tex2d[t][s][1] = t*255/(SIZE-1);
|
|
tex2d[t][s][2] = 0;
|
|
}
|
|
}
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
glActiveTextureARB(GL_TEXTURE0_ARB);
|
|
glBindTexture(GL_TEXTURE_2D, texObj[0]);
|
|
|
|
|
|
glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
|
|
GL_RGB, GL_UNSIGNED_BYTE, tex2d);
|
|
|
|
glEnable(GL_TEXTURE_2D);
|
|
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
|
|
}
|
|
|
|
{
|
|
GLubyte tex2d[SIZE][SIZE][3];
|
|
GLint s, t;
|
|
|
|
for (s = 0; s < SIZE; s++) {
|
|
for (t = 0; t < SIZE; t++) {
|
|
GLboolean on = ((s/4) ^ (t/4)) & 1;
|
|
tex2d[t][s][0] = on ? 128 : 0;
|
|
tex2d[t][s][1] = on ? 128 : 0;
|
|
tex2d[t][s][2] = on ? 128 : 0;
|
|
}
|
|
}
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
glActiveTextureARB(GL_TEXTURE1_ARB);
|
|
glBindTexture(GL_TEXTURE_2D, texObj[1]);
|
|
|
|
glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
|
|
GL_RGB, GL_UNSIGNED_BYTE, tex2d);
|
|
|
|
glEnable(GL_TEXTURE_2D);
|
|
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
|
|
}
|
|
|
|
glActiveTextureARB( GL_TEXTURE0_ARB );
|
|
|
|
|
|
{
|
|
|
|
glGenBuffersARB(1, &arrayObj);
|
|
glGenBuffersARB(1, &elementObj);
|
|
|
|
glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
|
|
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, elementObj);
|
|
|
|
glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), &verts, GL_STATIC_DRAW_ARB);
|
|
glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(indices), indices, GL_STATIC_DRAW_ARB);
|
|
|
|
glEnableClientState( GL_VERTEX_ARRAY );
|
|
glVertexPointer( 4, GL_FLOAT, 0, Offset(&verts, position) );
|
|
|
|
glEnableClientState( GL_COLOR_ARRAY );
|
|
glColorPointer( 4, GL_UNSIGNED_BYTE, 0, Offset(&verts, color) );
|
|
|
|
glClientActiveTextureARB( GL_TEXTURE0_ARB );
|
|
glEnableClientState( GL_TEXTURE_COORD_ARRAY );
|
|
glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex0) );
|
|
|
|
glClientActiveTextureARB( GL_TEXTURE1_ARB );
|
|
glEnableClientState( GL_TEXTURE_COORD_ARRAY );
|
|
glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex1) );
|
|
|
|
glClientActiveTextureARB( GL_TEXTURE0_ARB );
|
|
}
|
|
}
|
|
|
|
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 27:
|
|
exit(1);
|
|
default:
|
|
break;
|
|
}
|
|
|
|
glutPostRedisplay();
|
|
}
|
|
|
|
static void Draw(void)
|
|
{
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, NULL );
|
|
|
|
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;
|
|
}
|