| /* |
| * 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. |
| */ |
| |
| #define GL_GLEXT_PROTOTYPES |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <GL/glut.h> |
| |
| |
| #define CI_OFFSET_1 16 |
| #define CI_OFFSET_2 32 |
| |
| GLenum doubleBuffer; |
| |
| static GLuint DrawPBO; |
| |
| 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 tex2d[SIZE][SIZE][4]; |
| GLint s, t; |
| |
| for (s = 0; s < SIZE; s++) { |
| for (t = 0; t < SIZE; t++) { |
| /* bgra: |
| */ |
| tex2d[t][s][0] = 0x30; |
| tex2d[t][s][1] = t*255/(SIZE-1); |
| tex2d[t][s][2] = s*255/(SIZE-1); |
| tex2d[t][s][3] = 0xff; |
| } |
| } |
| |
| |
| /* put image into DrawPBO */ |
| glGenBuffersARB(1, &DrawPBO); |
| glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, DrawPBO); |
| glBufferDataARB(GL_PIXEL_PACK_BUFFER_EXT, |
| SIZE * SIZE * 4, tex2d, GL_STATIC_DRAW); |
| glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, 0); |
| |
| |
| glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
| 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, 1); |
| glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE, SIZE, 0, |
| GL_BGRA, GL_UNSIGNED_BYTE, NULL); |
| glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0); |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 4); |
| glEnable(GL_TEXTURE_2D); |
| } |
| |
| } |
| |
| 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: |
| return; |
| } |
| |
| glutPostRedisplay(); |
| } |
| |
| static void Draw(void) |
| { |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| glBegin(GL_QUADS); |
| glTexCoord2f(1,0); |
| glVertex3f( 0.9, -0.9, -30.0); |
| glTexCoord2f(1,1); |
| glVertex3f( 0.9, 0.9, -30.0); |
| glTexCoord2f(0,1); |
| glVertex3f(-0.9, 0.9, -30.0); |
| glTexCoord2f(0,0); |
| 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; |
| 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; |
| } |