402 lines
8.9 KiB
C
402 lines
8.9 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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#define SOLID 1
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#define LINE 2
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#define POINT 3
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GLenum rgb, doubleBuffer, directRender, windType;
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GLint windW, windH;
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GLenum dithering = GL_TRUE;
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GLenum showVerticies = GL_TRUE;
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GLenum hideBottomTriangle = GL_FALSE;
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GLenum outline = GL_TRUE;
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GLenum culling = GL_FALSE;
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GLenum winding = GL_FALSE;
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GLenum face = GL_FALSE;
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GLenum state = SOLID;
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GLenum aaMode = GL_FALSE;
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GLenum shade = GL_TRUE;
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GLint color1, color2, color3;
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float zRotation = 90.0;
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float zoom = 1.0;
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float boxA[3] = {-100, -100, 0};
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float boxB[3] = { 100, -100, 0};
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float boxC[3] = { 100, 100, 0};
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float boxD[3] = {-100, 100, 0};
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float p0[3] = {-125,-80, 0};
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float p1[3] = {-125, 80, 0};
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float p2[3] = { 172, 0, 0};
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static void Init(void)
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{
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float r, g, b;
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float percent1, percent2;
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GLint i, j;
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glLineStipple(1, 0xF0F0);
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glEnable(GL_SCISSOR_TEST);
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if (!rgb) {
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for (j = 0; j <= 12; j++) {
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if (j <= 6) {
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percent1 = j / 6.0;
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r = 1.0 - 0.8 * percent1;
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g = 0.2 + 0.8 * percent1;
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b = 0.2;
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} else {
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percent1 = (j - 6) / 6.0;
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r = 0.2;
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g = 1.0 - 0.8 * percent1;
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b = 0.2 + 0.8 * percent1;
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}
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tkSetOneColor(j+18, r, g, b);
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for (i = 0; i < 16; i++) {
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percent2 = i / 15.0;
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tkSetOneColor(j*16+1+32, r*percent2, g*percent2, b*percent2);
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}
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}
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color1 = 18;
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color2 = 24;
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color3 = 30;
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}
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}
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static void Reshape(int width, int height)
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{
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windW = (GLint)width;
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windH = (GLint)height;
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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_LEFT:
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zRotation += 0.5;
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break;
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case TK_RIGHT:
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zRotation -= 0.5;
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break;
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case TK_Z:
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zoom *= 0.75;
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break;
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case TK_z:
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zoom /= 0.75;
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if (zoom > 10) {
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zoom = 10;
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}
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break;
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case TK_1:
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glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
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break;
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case TK_2:
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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break;
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case TK_3:
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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break;
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case TK_4:
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state = POINT;
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break;
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case TK_5:
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state = LINE;
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break;
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case TK_6:
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state = SOLID;
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break;
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case TK_7:
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culling = !culling;
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break;
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case TK_8:
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winding = !winding;
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break;
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case TK_9:
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face = !face;
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break;
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case TK_v:
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showVerticies = !showVerticies;
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break;
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case TK_s:
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shade = !shade;
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(shade) ? glShadeModel(GL_SMOOTH) : glShadeModel(GL_FLAT);
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break;
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case TK_h:
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hideBottomTriangle = !hideBottomTriangle;
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break;
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case TK_o:
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outline = !outline;
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break;
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case TK_m:
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dithering = !dithering;
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break;
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case TK_0:
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aaMode = !aaMode;
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if (aaMode) {
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glEnable(GL_POLYGON_SMOOTH);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE);
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if (!rgb) {
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color1 = 32;
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color2 = 128;
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color3 = 224;
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}
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} else {
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glDisable(GL_POLYGON_SMOOTH);
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glDisable(GL_BLEND);
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if (!rgb) {
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color1 = 18;
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color2 = 24;
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color3 = 30;
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}
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}
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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 BeginPrim(void)
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{
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switch (state) {
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case SOLID:
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glBegin(GL_POLYGON);
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break;
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case LINE:
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glBegin(GL_LINE_LOOP);
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break;
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case POINT:
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glBegin(GL_POINTS);
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break;
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}
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}
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static void EndPrim(void)
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{
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glEnd();
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}
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static void Draw(void)
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{
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float scaleX, scaleY;
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glViewport(0, 0, windW, windH);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluOrtho2D(-175, 175, -175, 175);
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glMatrixMode(GL_MODELVIEW);
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glScissor(0, 0, windW, windH);
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(culling) ? glEnable(GL_CULL_FACE) : glDisable(GL_CULL_FACE);
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(winding) ? glFrontFace(GL_CCW) : glFrontFace(GL_CW);
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(face) ? glCullFace(GL_FRONT) : glCullFace(GL_BACK);
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(dithering) ? glEnable(GL_DITHER) : glDisable(GL_DITHER);
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glClear(GL_COLOR_BUFFER_BIT);
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TK_SETCOLOR(windType, TK_GREEN);
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glBegin(GL_LINE_LOOP);
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glVertex3fv(boxA);
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glVertex3fv(boxB);
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glVertex3fv(boxC);
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glVertex3fv(boxD);
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glEnd();
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if (!hideBottomTriangle) {
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glPushMatrix();
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glScalef(zoom, zoom, zoom);
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glRotatef(zRotation, 0, 0, 1);
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TK_SETCOLOR(windType, TK_BLUE);
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BeginPrim();
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glVertex3fv(p0);
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glVertex3fv(p1);
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glVertex3fv(p2);
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EndPrim();
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if (showVerticies) {
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(rgb) ? glColor3fv(tkRGBMap[TK_RED]) : glIndexf(color1);
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glRectf(p0[0]-2, p0[1]-2, p0[0]+2, p0[1]+2);
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(rgb) ? glColor3fv(tkRGBMap[TK_GREEN]) : glIndexf(color2);
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glRectf(p1[0]-2, p1[1]-2, p1[0]+2, p1[1]+2);
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(rgb) ? glColor3fv(tkRGBMap[TK_BLUE]) : glIndexf(color3);
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glRectf(p2[0]-2, p2[1]-2, p2[0]+2, p2[1]+2);
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}
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glPopMatrix();
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}
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scaleX = (float)(windW - 20) / 2 / 175 * (175 - 100) + 10;
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scaleY = (float)(windH - 20) / 2 / 175 * (175 - 100) + 10;
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glViewport(scaleX, scaleY, windW-2*scaleX, windH-2*scaleY);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluOrtho2D(-100, 100, -100, 100);
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glMatrixMode(GL_MODELVIEW);
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glScissor(scaleX, scaleY, windW-2*scaleX, windH-2*scaleY);
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glPushMatrix();
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glScalef(zoom, zoom, zoom);
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glRotatef(zRotation, 0,0,1);
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glPointSize(10);
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glLineWidth(5);
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glEnable(GL_POINT_SMOOTH);
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glEnable(GL_LINE_STIPPLE);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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TK_SETCOLOR(windType, TK_RED);
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BeginPrim();
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(rgb) ? glColor3fv(tkRGBMap[TK_RED]) : glIndexf(color1);
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glVertex3fv(p0);
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(rgb) ? glColor3fv(tkRGBMap[TK_GREEN]) : glIndexf(color2);
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glVertex3fv(p1);
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(rgb) ? glColor3fv(tkRGBMap[TK_BLUE]) : glIndexf(color3);
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glVertex3fv(p2);
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EndPrim();
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glPointSize(1);
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glLineWidth(1);
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glDisable(GL_POINT_SMOOTH);
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glDisable(GL_LINE_STIPPLE);
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glBlendFunc(GL_ONE, GL_ZERO);
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if (outline) {
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TK_SETCOLOR(windType, TK_WHITE);
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glBegin(GL_LINE_LOOP);
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glVertex3fv(p0);
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glVertex3fv(p1);
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glVertex3fv(p2);
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glEnd();
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}
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glPopMatrix();
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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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if (Args(argc, argv) == GL_FALSE) {
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tkQuit();
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}
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windW = 600;
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windH = 300;
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tkInitPosition(0, 0, windW, windH);
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windType = (rgb) ? TK_RGB : TK_INDEX;
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windType |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
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windType |= (directRender) ? TK_DIRECT : TK_INDIRECT;
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tkInitDisplayMode(windType);
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if (tkInitWindow("Triangle 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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