225 lines
5.9 KiB
C
225 lines
5.9 KiB
C
/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "tk.h"
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#if 0
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#define CI_OFFSET_1 16
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#define CI_OFFSET_2 32
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#else
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#define CI_OFFSET_1 32
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#define CI_OFFSET_2 48
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#endif
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GLenum rgb, doubleBuffer, directRender;
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GLenum antiAlias, stipple;
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GLubyte stippleBits[32*4] = {
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
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};
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static void Init(void)
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{
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GLint i;
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glClearIndex(0.0);
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if (!rgb) {
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for (i = 0; i < 16; i++) {
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tkSetOneColor(i+CI_OFFSET_1, 0.0, 0.0, i/15.0);
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tkSetOneColor(i+CI_OFFSET_2, 0.0, i/15.0, 0.0);
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}
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}
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antiAlias = GL_FALSE;
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stipple = GL_FALSE;
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}
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static void Reshape(int width, int height)
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{
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glViewport(0, 0, (GLint)width, (GLint)height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
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glMatrixMode(GL_MODELVIEW);
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}
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static GLenum Key(int key, GLenum mask)
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{
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switch (key) {
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case TK_ESCAPE:
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tkQuit();
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case TK_1:
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antiAlias = !antiAlias;
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break;
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case TK_2:
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stipple = !stipple;
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break;
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default:
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return GL_FALSE;
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}
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return GL_TRUE;
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}
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static void Draw(void)
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{
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GLint ci1, ci2;
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glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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if (antiAlias) {
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ci1 = CI_OFFSET_1;
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ci2 = CI_OFFSET_2;
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glBlendFunc(GL_SRC_ALPHA, GL_ONE);
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glEnable(GL_BLEND);
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glEnable(GL_POLYGON_SMOOTH);
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glDisable(GL_DEPTH_TEST);
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} else {
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ci1 = TK_BLUE;
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ci2 = TK_GREEN;
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glDisable(GL_BLEND);
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glDisable(GL_POLYGON_SMOOTH);
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glEnable(GL_DEPTH_TEST);
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}
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if (stipple) {
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glPolygonStipple(stippleBits);
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glEnable(GL_POLYGON_STIPPLE);
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} else {
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glDisable(GL_POLYGON_STIPPLE);
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}
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glBegin(GL_TRIANGLES);
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(rgb) ? glColor3fv(tkRGBMap[TK_BLUE]) : glIndexi(ci1);
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glVertex3f( 0.9, -0.9, -30.0);
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glVertex3f( 0.9, 0.9, -30.0);
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glVertex3f(-0.9, 0.0, -30.0);
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(rgb) ? glColor3fv(tkRGBMap[TK_GREEN]) : glIndexi(ci2);
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glVertex3f(-0.9, -0.9, -40.0);
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glVertex3f(-0.9, 0.9, -40.0);
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glVertex3f( 0.9, 0.0, -25.0);
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glEnd();
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glFlush();
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if (doubleBuffer) {
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tkSwapBuffers();
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}
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}
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static GLenum Args(int argc, char **argv)
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{
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GLint i;
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rgb = GL_TRUE;
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doubleBuffer = GL_FALSE;
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directRender = GL_FALSE;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-ci") == 0) {
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rgb = GL_FALSE;
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} else if (strcmp(argv[i], "-rgb") == 0) {
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rgb = GL_TRUE;
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} else if (strcmp(argv[i], "-sb") == 0) {
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doubleBuffer = GL_FALSE;
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} else if (strcmp(argv[i], "-db") == 0) {
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doubleBuffer = GL_TRUE;
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} else if (strcmp(argv[i], "-dr") == 0) {
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directRender = GL_TRUE;
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} else if (strcmp(argv[i], "-ir") == 0) {
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directRender = GL_FALSE;
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} else {
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printf("%s (Bad option).\n", argv[i]);
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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void main(int argc, char **argv)
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{
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GLenum type;
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if (Args(argc, argv) == GL_FALSE) {
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tkQuit();
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}
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tkInitPosition(0, 0, 300, 300);
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type = TK_DEPTH16;
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type |= (rgb) ? TK_RGB : TK_INDEX;
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type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
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type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
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tkInitDisplayMode(type);
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if (tkInitWindow("Depth Test") == GL_FALSE) {
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tkQuit();
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}
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Init();
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tkExposeFunc(Reshape);
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tkReshapeFunc(Reshape);
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tkKeyDownFunc(Key);
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tkDisplayFunc(Draw);
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tkExec();
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}
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