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-rw-r--r--progs/xdemos/offset.c343
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diff --git a/progs/xdemos/offset.c b/progs/xdemos/offset.c
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index 3858a5b802..0000000000
--- a/progs/xdemos/offset.c
+++ /dev/null
@@ -1,343 +0,0 @@
-/****************************************************************************
-Copyright 1995 by Silicon Graphics Incorporated, Mountain View, California.
-
- All Rights Reserved
-
-Permission to use, copy, modify, and distribute this software and its
-documentation for any purpose and without fee is hereby granted,
-provided that the above copyright notice appear in all copies and that
-both that copyright notice and this permission notice appear in
-supporting documentation, and that the name of Silicon Graphics not be
-used in advertising or publicity pertaining to distribution of the
-software without specific, written prior permission.
-
-SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
-INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
-EVENT SHALL SILICON GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
-CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
-USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
-OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
-PERFORMANCE OF THIS SOFTWARE.
-
-****************************************************************************/
-
-/*
- * Derived from code written by Kurt Akeley, November 1992
- *
- * Uses PolygonOffset to draw hidden-line images. PolygonOffset
- * shifts the z values of polygons an amount that is
- * proportional to their slope in screen z. This keeps
- * the lines, which are drawn without displacement, from
- * interacting with their respective polygons, and
- * thus eliminates line dropouts.
- *
- * The left image shows an ordinary antialiased wireframe image.
- * The center image shows an antialiased hidden-line image without
- * PolygonOffset.
- * The right image shows an antialiased hidden-line image using
- * PolygonOffset to reduce artifacts.
- *
- * Drag with a mouse button pressed to rotate the models.
- * Press the escape key to exit.
- */
-
-/*
- * Modified for OpenGL 1.1 glPolygonOffset() conventions
- */
-
-
-#include <GL/glx.h>
-#include <X11/keysym.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#undef GL_EXT_polygon_offset /* use GL 1.1 version instead of extension */
-
-
-#ifndef EXIT_FAILURE
-# define EXIT_FAILURE 1
-#endif
-#ifndef EXIT_SUCCESS
-# define EXIT_SUCCESS 0
-#endif
-
-#define MAXQUAD 6
-
-typedef float Vertex[3];
-
-typedef Vertex Quad[4];
-
-/* data to define the six faces of a unit cube */
-Quad quads[MAXQUAD] = {
- { {0,0,0}, {0,0,1}, {0,1,1}, {0,1,0} }, /* x = 0 */
- { {0,0,0}, {1,0,0}, {1,0,1}, {0,0,1} }, /* y = 0 */
- { {0,0,0}, {1,0,0}, {1,1,0}, {0,1,0} }, /* z = 0 */
- { {1,0,0}, {1,0,1}, {1,1,1}, {1,1,0} }, /* x = 1 */
- { {0,1,0}, {1,1,0}, {1,1,1}, {0,1,1} }, /* y = 1 */
- { {0,0,1}, {1,0,1}, {1,1,1}, {0,1,1} } /* z = 1 */
-};
-
-#define WIREFRAME 0
-#define HIDDEN_LINE 1
-
-static void error(const char* prog, const char* msg);
-static void cubes(int mx, int my, int mode);
-static void fill(Quad quad);
-static void outline(Quad quad);
-static void draw_hidden(Quad quad, int mode, int face);
-static void process_input(Display *dpy, Window win);
-static int query_extension(char* extName);
-
-static int attributeList[] = { GLX_RGBA, GLX_RED_SIZE, 1, GLX_GREEN_SIZE, 1,
- GLX_BLUE_SIZE, 1, GLX_DOUBLEBUFFER, GLX_DEPTH_SIZE, 1, None };
-
-static int dimension = 3;
-
-static float Scale = 1.0;
-
-
-int main(int argc, char** argv) {
- Display *dpy;
- XVisualInfo *vi;
- XSetWindowAttributes swa;
- Window win;
- GLXContext cx;
- GLint z;
-
- dpy = XOpenDisplay(0);
- if (!dpy) error(argv[0], "can't open display");
-
- vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributeList);
- if (!vi) error(argv[0], "no suitable visual");
-
- cx = glXCreateContext(dpy, vi, 0, GL_TRUE);
-
- swa.colormap = XCreateColormap(dpy, RootWindow(dpy, vi->screen),
- vi->visual, AllocNone);
-
- swa.border_pixel = 0;
- swa.event_mask = ExposureMask | StructureNotifyMask | KeyPressMask |
- ButtonPressMask | ButtonMotionMask;
- win = XCreateWindow(dpy, RootWindow(dpy, vi->screen), 0, 0, 900, 300,
- 0, vi->depth, InputOutput, vi->visual,
- CWBorderPixel|CWColormap|CWEventMask, &swa);
- XStoreName(dpy, win, "hiddenline");
- XMapWindow(dpy, win);
-
- glXMakeCurrent(dpy, win, cx);
-
- /* check for the polygon offset extension */
-#ifndef GL_VERSION_1_1
- if (!query_extension("GL_EXT_polygon_offset"))
- error(argv[0], "polygon_offset extension is not available");
-#else
- (void) query_extension;
-#endif
-
- /* set up viewing parameters */
- glMatrixMode(GL_PROJECTION);
- glFrustum(-1, 1, -1, 1, 6, 20);
- glMatrixMode(GL_MODELVIEW);
- glTranslatef(0, 0, -15);
-
- /* set other relevant state information */
- glEnable(GL_DEPTH_TEST);
-
- glGetIntegerv(GL_DEPTH_BITS, &z);
- printf("GL_DEPTH_BITS = %d\n", z);
-
-#ifdef GL_EXT_polygon_offset
- printf("using 1.0 offset extension\n");
- glPolygonOffsetEXT( 1.0, 0.00001 );
-#else
- printf("using 1.1 offset\n");
- glPolygonOffset( 1.0, 0.5 );
-#endif
-
- glShadeModel( GL_FLAT );
- glDisable( GL_DITHER );
-
- /* process events until the user presses ESC */
- while (1) process_input(dpy, win);
-
- return 0;
-}
-
-static void
-draw_scene(int mx, int my) {
- glClearColor(0.25, 0.25, 0.25, 0);
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- glPushMatrix();
- glTranslatef(-1.7, 0.0, 0.0);
- cubes(mx, my, WIREFRAME);
- glPopMatrix();
-
- glPushMatrix();
- cubes(mx, my, HIDDEN_LINE);
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef(1.7, 0.0, 0.0);
-#ifdef GL_EXT_polygon_offset
- glEnable(GL_POLYGON_OFFSET_EXT);
-#else
- glEnable(GL_POLYGON_OFFSET_FILL);
-#endif
- glScalef(Scale, Scale, Scale);
- cubes(mx, my, HIDDEN_LINE);
-#ifdef GL_EXT_polygon_offset
- glDisable(GL_POLYGON_OFFSET_EXT);
-#else
- glDisable(GL_POLYGON_OFFSET_FILL);
-#endif
- glPopMatrix();
-}
-
-
-static void
-cubes(int mx, int my, int mode) {
- int x, y, z, i;
-
- /* track the mouse */
- glRotatef(mx / 2.0, 0, 1, 0);
- glRotatef(my / 2.0, 1, 0, 0);
-
- /* draw the lines as hidden polygons */
- glTranslatef(-0.5, -0.5, -0.5);
- glScalef(1.0/dimension, 1.0/dimension, 1.0/dimension);
- for (z = 0; z < dimension; z++) {
- for (y = 0; y < dimension; y++) {
- for (x = 0; x < dimension; x++) {
- glPushMatrix();
- glTranslatef(x, y, z);
- glScalef(0.8, 0.8, 0.8);
- for (i = 0; i < MAXQUAD; i++)
- draw_hidden(quads[i], mode, i);
- glPopMatrix();
- }
- }
- }
-}
-
-static void
-fill(Quad quad) {
- /* draw a filled polygon */
- glBegin(GL_QUADS);
- glVertex3fv(quad[0]);
- glVertex3fv(quad[1]);
- glVertex3fv(quad[2]);
- glVertex3fv(quad[3]);
- glEnd();
-}
-
-static void
-outline(Quad quad) {
- /* draw an outlined polygon */
- glBegin(GL_LINE_LOOP);
- glVertex3fv(quad[0]);
- glVertex3fv(quad[1]);
- glVertex3fv(quad[2]);
- glVertex3fv(quad[3]);
- glEnd();
-}
-
-static void
-draw_hidden(Quad quad, int mode, int face) {
- static const GLfloat colors[3][3] = {
- {0.5, 0.5, 0.0},
- {0.8, 0.5, 0.0},
- {0.0, 0.5, 0.8}
- };
- if (mode == HIDDEN_LINE) {
- glColor3fv(colors[face % 3]);
- fill(quad);
- }
-
- /* draw the outline using white */
- glColor3f(1, 1, 1);
- outline(quad);
-}
-
-static void
-process_input(Display *dpy, Window win) {
- XEvent event;
- static int prevx, prevy;
- static int deltax = 90, deltay = 40;
-
- do {
- char buf[31];
- KeySym keysym;
-
- XNextEvent(dpy, &event);
- switch(event.type) {
- case Expose:
- break;
- case ConfigureNotify: {
- /* this approach preserves a 1:1 viewport aspect ratio */
- int vX, vY, vW, vH;
- int eW = event.xconfigure.width, eH = event.xconfigure.height;
- if (eW >= eH) {
- vX = 0;
- vY = (eH - eW) >> 1;
- vW = vH = eW;
- } else {
- vX = (eW - eH) >> 1;
- vY = 0;
- vW = vH = eH;
- }
- glViewport(vX, vY, vW, vH);
- }
- break;
- case KeyPress:
- (void) XLookupString(&event.xkey, buf, sizeof(buf), &keysym, NULL);
- switch (keysym) {
- case 'Z':
- Scale *= 1.1;
- break;
- case 'z':
- Scale *= 0.9;
- break;
- case XK_Escape:
- exit(EXIT_SUCCESS);
- default:
- break;
- }
- break;
- case ButtonPress:
- prevx = event.xbutton.x;
- prevy = event.xbutton.y;
- break;
- case MotionNotify:
- deltax += (event.xbutton.x - prevx); prevx = event.xbutton.x;
- deltay += (event.xbutton.y - prevy); prevy = event.xbutton.y;
- break;
- default:
- break;
- }
- } while (XPending(dpy));
-
- draw_scene(deltax, deltay);
- glXSwapBuffers(dpy, win);
-}
-
-static void
-error(const char *prog, const char *msg) {
- fprintf(stderr, "%s: %s\n", prog, msg);
- exit(EXIT_FAILURE);
-}
-
-static int
-query_extension(char* extName) {
- char *p = (char *) glGetString(GL_EXTENSIONS);
- char *end = p + strlen(p);
- while (p < end) {
- int n = strcspn(p, " ");
- if ((strlen(extName) == n) && (strncmp(extName, p, n) == 0))
- return GL_TRUE;
- p += (n + 1);
- }
- return GL_FALSE;
-}
-
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