This is tri.c in view mode; [Download] [Up]
/*
* 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 "gltk.h"
#define SOLID 1
#define LINE 2
#define POINT 3
GLenum rgb, doubleBuffer, directRender, windType;
GLint windW, windH;
GLenum dithering = GL_TRUE;
GLenum showVerticies = GL_TRUE;
GLenum hideBottomTriangle = GL_FALSE;
GLenum outline = GL_TRUE;
GLenum culling = GL_FALSE;
GLenum winding = GL_FALSE;
GLenum face = GL_FALSE;
GLenum state = SOLID;
GLenum aaMode = GL_FALSE;
GLenum shade = GL_TRUE;
GLint color1, color2, color3;
float zRotation = 90.0;
float zoom = 1.0;
float boxA[3] = {-100, -100, 0};
float boxB[3] = { 100, -100, 0};
float boxC[3] = { 100, 100, 0};
float boxD[3] = {-100, 100, 0};
float p0[3] = {-125,-80, 0};
float p1[3] = {-125, 80, 0};
float p2[3] = { 172, 0, 0};
static void Init(void)
{
float r, g, b;
float percent1, percent2;
GLint i, j;
glClearColor(0.0, 0.0, 0.0, 0.0);
glLineStipple(1, 0xF0F0);
glEnable(GL_SCISSOR_TEST);
if (!rgb) {
for (j = 0; j <= 12; j++) {
if (j <= 6) {
percent1 = j / 6.0;
r = 1.0 - 0.8 * percent1;
g = 0.2 + 0.8 * percent1;
b = 0.2;
} else {
percent1 = (j - 6) / 6.0;
r = 0.2;
g = 1.0 - 0.8 * percent1;
b = 0.2 + 0.8 * percent1;
}
tkSetOneColor(j+18, r, g, b);
for (i = 0; i < 16; i++) {
percent2 = i / 15.0;
tkSetOneColor(j*16+1+32, r*percent2, g*percent2, b*percent2);
}
}
color1 = 18;
color2 = 24;
color3 = 30;
}
}
static void Reshape(int width, int height)
{
windW = (GLint)width;
windH = (GLint)height;
}
static GLenum Key(int key, GLenum mask)
{
switch (key) {
case TK_ESCAPE:
tkQuit();
case TK_LEFT:
zRotation += 0.5;
break;
case TK_RIGHT:
zRotation -= 0.5;
break;
case TK_Z:
zoom *= 0.75;
break;
case TK_z:
zoom /= 0.75;
if (zoom > 10) {
zoom = 10;
}
break;
case TK_1:
glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
break;
case TK_2:
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
break;
case TK_3:
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
break;
case TK_4:
state = POINT;
break;
case TK_5:
state = LINE;
break;
case TK_6:
state = SOLID;
break;
case TK_7:
culling = !culling;
break;
case TK_8:
winding = !winding;
break;
case TK_9:
face = !face;
break;
case TK_v:
showVerticies = !showVerticies;
break;
case TK_s:
shade = !shade;
(shade) ? glShadeModel(GL_SMOOTH) : glShadeModel(GL_FLAT);
break;
case TK_h:
hideBottomTriangle = !hideBottomTriangle;
break;
case TK_o:
outline = !outline;
break;
case TK_m:
dithering = !dithering;
break;
case TK_0:
aaMode = !aaMode;
if (aaMode) {
glEnable(GL_POLYGON_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
if (!rgb) {
color1 = 32;
color2 = 128;
color3 = 224;
}
} else {
glDisable(GL_POLYGON_SMOOTH);
glDisable(GL_BLEND);
if (!rgb) {
color1 = 18;
color2 = 24;
color3 = 30;
}
}
break;
default:
return GL_FALSE;
}
return GL_TRUE;
}
static void BeginPrim(void)
{
switch (state) {
case SOLID:
glBegin(GL_POLYGON);
break;
case LINE:
glBegin(GL_LINE_LOOP);
break;
case POINT:
glBegin(GL_POINTS);
break;
}
}
static void EndPrim(void)
{
glEnd();
}
static void Draw(void)
{
float scaleX, scaleY;
glViewport(0, 0, windW, windH);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-175, 175, -175, 175);
glMatrixMode(GL_MODELVIEW);
glScissor(0, 0, windW, windH);
(culling) ? glEnable(GL_CULL_FACE) : glDisable(GL_CULL_FACE);
(winding) ? glFrontFace(GL_CCW) : glFrontFace(GL_CW);
(face) ? glCullFace(GL_FRONT) : glCullFace(GL_BACK);
(dithering) ? glEnable(GL_DITHER) : glDisable(GL_DITHER);
glClear(GL_COLOR_BUFFER_BIT);
TK_SETCOLOR(windType, TK_GREEN);
glBegin(GL_LINE_LOOP);
glVertex3fv(boxA);
glVertex3fv(boxB);
glVertex3fv(boxC);
glVertex3fv(boxD);
glEnd();
if (!hideBottomTriangle) {
glPushMatrix();
glScalef(zoom, zoom, zoom);
glRotatef(zRotation, 0, 0, 1);
TK_SETCOLOR(windType, TK_BLUE);
BeginPrim();
glVertex3fv(p0);
glVertex3fv(p1);
glVertex3fv(p2);
EndPrim();
if (showVerticies) {
(rgb) ? glColor3fv(tkRGBMap[TK_RED]) : glIndexf(color1);
glRectf(p0[0]-2, p0[1]-2, p0[0]+2, p0[1]+2);
(rgb) ? glColor3fv(tkRGBMap[TK_GREEN]) : glIndexf(color2);
glRectf(p1[0]-2, p1[1]-2, p1[0]+2, p1[1]+2);
(rgb) ? glColor3fv(tkRGBMap[TK_BLUE]) : glIndexf(color3);
glRectf(p2[0]-2, p2[1]-2, p2[0]+2, p2[1]+2);
}
glPopMatrix();
}
scaleX = (float)(windW - 20) / 2 / 175 * (175 - 100) + 10;
scaleY = (float)(windH - 20) / 2 / 175 * (175 - 100) + 10;
glViewport(scaleX, scaleY, windW-2*scaleX, windH-2*scaleY);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-100, 100, -100, 100);
glMatrixMode(GL_MODELVIEW);
glScissor(scaleX, scaleY, windW-2*scaleX, windH-2*scaleY);
glPushMatrix();
glScalef(zoom, zoom, zoom);
glRotatef(zRotation, 0,0,1);
glPointSize(10);
glLineWidth(5);
glEnable(GL_POINT_SMOOTH);
glEnable(GL_LINE_STIPPLE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
TK_SETCOLOR(windType, TK_RED);
BeginPrim();
(rgb) ? glColor3fv(tkRGBMap[TK_RED]) : glIndexf(color1);
glVertex3fv(p0);
(rgb) ? glColor3fv(tkRGBMap[TK_GREEN]) : glIndexf(color2);
glVertex3fv(p1);
(rgb) ? glColor3fv(tkRGBMap[TK_BLUE]) : glIndexf(color3);
glVertex3fv(p2);
EndPrim();
glPointSize(1);
glLineWidth(1);
glDisable(GL_POINT_SMOOTH);
glDisable(GL_LINE_STIPPLE);
glBlendFunc(GL_ONE, GL_ZERO);
if (outline) {
TK_SETCOLOR(windType, TK_WHITE);
glBegin(GL_LINE_LOOP);
glVertex3fv(p0);
glVertex3fv(p1);
glVertex3fv(p2);
glEnd();
}
glPopMatrix();
glFlush();
if (doubleBuffer) {
tkSwapBuffers();
}
}
static GLenum Args(int argc, char **argv)
{
GLint i;
rgb = GL_TRUE;
doubleBuffer = GL_FALSE;
directRender = GL_TRUE;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-ci") == 0) {
rgb = GL_FALSE;
} else if (strcmp(argv[i], "-rgb") == 0) {
rgb = GL_TRUE;
} else if (strcmp(argv[i], "-sb") == 0) {
doubleBuffer = GL_FALSE;
} else if (strcmp(argv[i], "-db") == 0) {
doubleBuffer = GL_TRUE;
} else if (strcmp(argv[i], "-dr") == 0) {
directRender = GL_TRUE;
} else if (strcmp(argv[i], "-ir") == 0) {
directRender = GL_FALSE;
} else {
printf("%s (Bad option).\n", argv[i]);
return GL_FALSE;
}
}
return GL_TRUE;
}
void main(int argc, char **argv)
{
if (Args(argc, argv) == GL_FALSE) {
tkQuit();
}
windW = 600;
windH = 300;
tkInitPosition(0, 0, windW, windH);
windType = (rgb) ? TK_RGB : TK_INDEX;
windType |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
windType |= (directRender) ? TK_DIRECT : TK_INDIRECT;
tkInitDisplayMode(windType);
if (tkInitWindow("Triangle Test") == GL_FALSE) {
tkQuit();
}
Init();
tkExposeFunc(Reshape);
tkReshapeFunc(Reshape);
tkKeyDownFunc(Key);
tkDisplayFunc(Draw);
tkExec();
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.