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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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toolbox
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src
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exampleCode
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opengl
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xlib
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cull.c
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C/C++ Source or Header
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1996-11-11
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11KB
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400 lines
/*
* (c) Copyright 1993-94, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
*
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "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, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
*
* U.S. GOVERNMENT RESTRICTED RIGHTS LEGEND
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
*/
#include <GL/glx.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/keysym.h>
static int attributes[] = {
GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
None,
};
int width = 350, height = 450;
static GLfloat cwa[2] = { 0, -1 };
static GLfloat cwb[2] = { -1, .5 };
static GLfloat cwc[2] = { 1, 1 };
static GLfloat ccwa[2] = { 0, -1 };
static GLfloat ccwb[2] = { 1, .5 };
static GLfloat ccwc[2] = { -1, 1 };
static GLfloat ca[3] = { 1, 0, 0 };
static GLfloat cb[3] = { 0, 1, 0 };
static GLfloat cc[3] = { 0, 0, 1 };
static GLubyte ZeroBitmap[9] = {
0x1c, 0x22, 0x22, 0x32, 0x2a, 0x26, 0x22, 0x22, 0x1c,
};
static GLubyte OneBitmap[9] = {
0x0e, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x0c, 0x04,
};
static GLubyte TwoBitmap[9] = {
0x3e, 0x20, 0x10, 0x08, 0x04, 0x02, 0x22, 0x22, 0x1c,
};
static void Label(GLfloat first[2], GLfloat second[2], GLfloat third[2])
{
glColor3f(1, 1, 1);
glRasterPos2fv(first);
glBitmap(8, 9, 0, 0, 0, 0, ZeroBitmap);
glRasterPos2fv(second);
glBitmap(8, 9, 0, 0, 0, 0, OneBitmap);
glRasterPos2fv(third);
glBitmap(8, 9, 0, 0, 0, 0, TwoBitmap);
}
static void DrawTriangles(void)
{
glPushMatrix();
Label(cwa, cwb, cwc);
glBegin(GL_TRIANGLES);
glColor3fv(ca); glVertex2fv(cwa);
glColor3fv(cb); glVertex2fv(cwb);
glColor3fv(cc); glVertex2fv(cwc);
glEnd();
glTranslatef(3.5, 0, 0);
Label(ccwa, ccwb, ccwc);
glBegin(GL_TRIANGLES);
glColor3fv(ca); glVertex2fv(ccwa);
glColor3fv(cb); glVertex2fv(ccwb);
glColor3fv(cc); glVertex2fv(ccwc);
glEnd();
glTranslatef(-3.5, 3.5, 0);
Label(cwa, cwc, cwb);
glBegin(GL_TRIANGLES);
glColor3fv(ca); glVertex2fv(cwa);
glColor3fv(cc); glVertex2fv(cwc);
glColor3fv(cb); glVertex2fv(cwb);
glEnd();
glTranslatef(3.5, 0, 0);
Label(ccwa, ccwc, ccwb);
glBegin(GL_TRIANGLES);
glColor3fv(ca); glVertex2fv(ccwa);
glColor3fv(cc); glVertex2fv(ccwc);
glColor3fv(cb); glVertex2fv(ccwb);
glEnd();
glTranslatef(-3.5, 3.5, 0);
Label(cwb, cwa, cwc);
glBegin(GL_TRIANGLES);
glColor3fv(cb); glVertex2fv(cwb);
glColor3fv(ca); glVertex2fv(cwa);
glColor3fv(cc); glVertex2fv(cwc);
glEnd();
glTranslatef(3.5, 0, 0);
Label(ccwb, ccwa, ccwc);
glBegin(GL_TRIANGLES);
glColor3fv(cb); glVertex2fv(ccwb);
glColor3fv(ca); glVertex2fv(ccwa);
glColor3fv(cc); glVertex2fv(ccwc);
glEnd();
glTranslatef(-3.5, 3.5, 0);
Label(cwb, cwc, cwa);
glBegin(GL_TRIANGLES);
glColor3fv(cb); glVertex2fv(cwb);
glColor3fv(cc); glVertex2fv(cwc);
glColor3fv(ca); glVertex2fv(cwa);
glEnd();
glTranslatef(3.5, 0, 0);
Label(ccwb, ccwc, ccwa);
glBegin(GL_TRIANGLES);
glColor3fv(cb); glVertex2fv(ccwb);
glColor3fv(cc); glVertex2fv(ccwc);
glColor3fv(ca); glVertex2fv(ccwa);
glEnd();
glTranslatef(-3.5, 3.5, 0);
Label(cwc, cwa, cwb);
glBegin(GL_TRIANGLES);
glColor3fv(cc); glVertex2fv(cwc);
glColor3fv(ca); glVertex2fv(cwa);
glColor3fv(cb); glVertex2fv(cwb);
glEnd();
glTranslatef(3.5, 0, 0);
Label(ccwc, ccwa, ccwb);
glBegin(GL_TRIANGLES);
glColor3fv(cc); glVertex2fv(ccwc);
glColor3fv(ca); glVertex2fv(ccwa);
glColor3fv(cb); glVertex2fv(ccwb);
glEnd();
glTranslatef(-3.5, 3.5, 0);
Label(cwc, cwb, cwa);
glBegin(GL_TRIANGLES);
glColor3fv(cc); glVertex2fv(cwc);
glColor3fv(cb); glVertex2fv(cwb);
glColor3fv(ca); glVertex2fv(cwa);
glEnd();
glTranslatef(3.5, 0, 0);
Label(ccwc, ccwb, ccwa);
glBegin(GL_TRIANGLES);
glColor3fv(cc); glVertex2fv(ccwc);
glColor3fv(cb); glVertex2fv(ccwb);
glColor3fv(ca); glVertex2fv(ccwa);
glEnd();
glPopMatrix();
}
static void DoDisplay(void)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-0.5, width - 0.5, -0.5, height - 0.5, 0.01, 1000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, width, height);
glClearColor(0.25, 0.25, 0.25, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
/* Draw flat triangles */
glShadeModel(GL_FLAT);
glTranslatef(50, 50, -10);
glScalef(20, 20, 1);
DrawTriangles();
/* Draw smooth triangles */
glShadeModel(GL_SMOOTH);
glTranslatef(8, 0, 0);
DrawTriangles();
}
static Bool WaitForMapNotify(Display *d, XEvent *e, char *arg)
{
if ((e->type == MapNotify) && (e->xmap.window == (Window)arg)) {
return GL_TRUE;
}
return GL_FALSE;
}
static const char* FaceName(GLenum face)
{
switch (face) {
case GL_FRONT: return "front";
case GL_BACK: return "back";
case GL_FRONT_AND_BACK: return "front and back";
default: return "???";
}
}
static const char* PolygonMode(GLenum mode)
{
switch (mode) {
case GL_FILL: return "fill";
case GL_POINT: return "point";
case GL_LINE: return "line";
default: return "???";
}
}
static const char* FrontFaceName(GLenum mode)
{
switch (mode) {
case GL_CW: return "CW";
case GL_CCW: return "CCW";
default: return "???";
}
}
static void DisplayState(void)
{
GLint frontFace, cullFace, polygonMode[2];
GLboolean cullEnabled;
glGetIntegerv(GL_FRONT_FACE, &frontFace);
glGetIntegerv(GL_CULL_FACE_MODE, &cullFace);
glGetIntegerv(GL_POLYGON_MODE, &polygonMode[0]);
cullEnabled = glIsEnabled(GL_CULL_FACE);
printf("PolygonMode: front=%s back=%s\n",
PolygonMode(polygonMode[0]),
PolygonMode(polygonMode[1]));
printf("CullFace: %s (%s)\n", FaceName(cullFace),
cullEnabled ? "enabled" : "disabled");
printf("FrontFace: %s\n", FrontFaceName(frontFace));
printf("\n");
}
int main()
{
XVisualInfo *vi;
Display *dpy;
Colormap cmap;
Window window;
XSetWindowAttributes swa;
GLXContext cx;
XEvent event;
GLboolean needDisplay;
GLint ccw, cull;
GLenum face;
dpy = XOpenDisplay(0);
if (!dpy) {
fprintf(stderr, "Can't connect to display \"%s\"\n", getenv("DISPLAY"));
return -1;
}
vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributes);
if (!vi) {
fprintf(stderr, "No singlebuffered rgba visual on \"%s\"\n",
getenv("DISPLAY"));
return -1;
}
cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen), vi->visual,
AllocNone);
swa.border_pixel = 0;
swa.colormap = cmap;
swa.event_mask = ExposureMask | StructureNotifyMask | KeyPressMask
| KeyReleaseMask;
window = XCreateWindow(dpy, RootWindow(dpy, vi->screen), 10, 10,
width, height,
0, vi->depth, InputOutput, vi->visual,
CWBorderPixel|CWColormap|CWEventMask, &swa);
XSetWMColormapWindows(dpy, window, &window, 1);
XStoreName(dpy, window, "Culling test");
XMapWindow(dpy, window);
XIfEvent(dpy, &event, WaitForMapNotify, (char*)window);
cx = glXCreateContext(dpy, vi, 0, GL_TRUE);
if (!glXMakeCurrent(dpy, window, cx)) {
fprintf(stderr, "Can't make window current to context\n");
return -1;
}
face = GL_FRONT_AND_BACK;
ccw = 0;
cull = 0;
glPolygonMode(face, GL_FILL);
glFrontFace(GL_CW);
glCullFace(GL_FRONT);
glDisable(GL_CULL_FACE);
DisplayState();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPointSize(4.0);
glEnable(GL_POINT_SMOOTH);
needDisplay = GL_TRUE;
for (;;) {
do {
XNextEvent(dpy, &event);
switch (event.type) {
case Expose:
needDisplay = GL_TRUE;
break;
case ConfigureNotify:
width = event.xconfigure.width;
height = event.xconfigure.height;
needDisplay = GL_TRUE;
break;
case KeyPress:
{
char buf[100];
int rv;
KeySym ks;
rv = XLookupString(&event.xkey, buf, sizeof(buf), &ks, 0);
switch (ks) {
case XK_0: face = GL_FRONT; break;
case XK_1: face = GL_BACK; break;
case XK_2: face = GL_FRONT_AND_BACK; break;
case XK_p:
case XK_P:
glPolygonMode(face, GL_POINT);
needDisplay = GL_TRUE;
break;
case XK_l:
case XK_L:
glPolygonMode(face, GL_LINE);
needDisplay = GL_TRUE;
break;
case XK_f:
case XK_F:
glPolygonMode(face, GL_FILL);
needDisplay = GL_TRUE;
break;
case XK_d:
case XK_D:
ccw = !ccw;
glFrontFace(ccw ? GL_CCW : GL_CW);
needDisplay = GL_TRUE;
break;
case XK_c:
case XK_C:
if (face != GL_FRONT_AND_BACK) {
glCullFace(face);
needDisplay = GL_TRUE;
}
break;
case XK_e:
case XK_E:
cull = !cull;
if (cull) {
glEnable(GL_CULL_FACE);
} else {
glDisable(GL_CULL_FACE);
}
needDisplay = GL_TRUE;
break;
case XK_Escape:
return 0;
}
}
break;
}
} while (XPending(dpy) != 0);
if (needDisplay) {
needDisplay = GL_FALSE;
DisplayState();
DoDisplay();
}
}
}