| 1 |
/* |
| 2 |
* opengl interface |
| 3 |
*/ |
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|
| 5 |
#include "config.h" |
| 6 |
|
| 7 |
#if HAVE_OPENGL |
| 8 |
|
| 9 |
#include <GL/glx.h> |
| 10 |
#include <GL/glu.h> |
| 11 |
#include <X11/keysym.h> |
| 12 |
|
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#include <iostream> |
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#include <iomanip> |
| 15 |
#include <cmath> |
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#include <cstdlib> |
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|
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#include "interface.h" |
| 19 |
#include "gl_int.h" |
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|
| 21 |
inline void glVertex (const vec &v) { glVertex3d (v[0], v[1], v[2]); } |
| 22 |
inline void glNormal (const vec &v) { glNormal3d (v[0], v[1], v[2]); } |
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|
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#define Begin(m) glBegin(m); in_begin = true; |
| 25 |
#define End() glEnd(); in_begin = false; |
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|
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#define HW_ACCUM 1 |
| 28 |
//#undef HW_ACCUM |
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|
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gl_int::gl_int () t_no |
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{ |
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in_begin = false; |
| 33 |
|
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dpy = XOpenDisplay (0); |
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if (!dpy) |
| 36 |
throw error("can't open display"); |
| 37 |
|
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int attributeList[] = { |
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GLX_RGBA, |
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GLX_RED_SIZE, 1, GLX_GREEN_SIZE, 1, GLX_BLUE_SIZE, 1, GLX_DOUBLEBUFFER, GLX_DEPTH_SIZE, 1, |
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#if HW_ACCUM |
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GLX_ACCUM_RED_SIZE, 1, GLX_ACCUM_GREEN_SIZE, 1, GLX_ACCUM_BLUE_SIZE, 1, |
| 43 |
#endif |
| 44 |
None }; |
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|
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vi = glXChooseVisual (dpy, DefaultScreen(dpy), attributeList); |
| 47 |
if (!vi) error("no suitable visual"); |
| 48 |
|
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glXGetConfig (dpy, vi, GLX_ALPHA_SIZE, &fb_depth); |
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if (fb_depth > 0) |
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{ |
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fb_format = GL_RGBA; |
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fb_depth = 4; |
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} |
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else |
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{ |
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fb_format = GL_RGB; |
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fb_depth = 3; |
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} |
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|
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cx = glXCreateContext (dpy, vi, 0, GL_TRUE); |
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|
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swa.colormap = XCreateColormap (dpy, RootWindow(dpy, vi->screen), |
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vi->visual, AllocNone); |
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|
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swa.border_pixel = 0; |
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swa.event_mask = ExposureMask | StructureNotifyMask | KeyPressMask | |
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ButtonPressMask | ButtonReleaseMask | ButtonMotionMask; |
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win = XCreateWindow (dpy, RootWindow (dpy, vi->screen), 0, 0, 900, 900, |
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0, vi->depth, InputOutput, vi->visual, |
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CWBorderPixel | CWColormap | CWEventMask, &swa); |
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XStoreName (dpy, win, PACKAGE " - " VERSION); |
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XMapWindow (dpy, win); |
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|
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glXMakeCurrent(dpy, win, cx); |
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|
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/* set up viewing parameters */ |
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glMatrixMode (GL_PROJECTION); |
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gluPerspective (20, 1, 0.1, 20); |
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glMatrixMode (GL_MODELVIEW); |
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glTranslatef (0, 0, -15); |
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|
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/* set other relevant state information */ |
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glEnable (GL_DEPTH_TEST); |
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//glEnable (GL_AUTO_NORMAL); |
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//glEnable (GL_DITHER); |
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//glEnable (GL_LINE_SMOOTH); |
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//glEnable (GL_POLYGON_SMOOTH); |
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|
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float specular[] = {1.0, 1.0, 1.0, 1.0}; |
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float diffuse[] = {0.7, 0.7, 0.7, 0.7}; |
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float position0[] = {0.2, -1.0, 0.2, 0.0}; |
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float position1[] = {0.0, -1.0, -1.0, 0.0}; |
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float lmodel_ambient[] = {0.5, 0.5, 0.5, 1.0}; |
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float local_view[] = { 0.0 }; |
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|
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glLightModelfv (GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); |
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glLightModeli (GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE); |
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glLightModeli (GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE); |
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glLightfv (GL_LIGHT0, GL_DIFFUSE, diffuse); |
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glLightfv (GL_LIGHT0, GL_POSITION, position0); |
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glLightfv (GL_LIGHT1, GL_DIFFUSE, diffuse); |
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glLightfv (GL_LIGHT1, GL_POSITION, position1); |
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glEnable (GL_LIGHT0); |
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//glEnable (GL_LIGHT1); |
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glEnable (GL_LIGHTING); |
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|
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glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST); |
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glHint (GL_POLYGON_SMOOTH_HINT, GL_FASTEST); |
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|
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glEnable (GL_NORMALIZE); |
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|
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glShadeModel (GL_SMOOTH); |
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glEnable (GL_POLYGON_OFFSET_FILL); |
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glPolygonOffset (-1, -1); |
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|
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glClearColor (1.0, 1.0, 1.0, 0.0); |
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|
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float spec[] = { 0.7, 0.7, 0.7, 0.0 }; glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR, spec); |
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float shine[] = { 20.0 }; glMaterialfv (GL_FRONT_AND_BACK, GL_SHININESS, shine); |
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float diff[] = { 0.4, 0.4, 0.4, 1.0 }; glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT, diff); |
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} |
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|
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gl_int::~gl_int () t_no |
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{ |
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XCloseDisplay (dpy); |
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} |
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|
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#define TREE_LIST 1 |
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|
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void gl_int::begin_fig () t_no |
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{ |
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x1 = 1e10; y1 = 1e10; z1 = 1e10; |
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x2 = -1e10; y2 = -1e10; z2 = -1e10; |
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glNewList (TREE_LIST, GL_COMPILE); |
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} |
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|
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void gl_int::end_fig () t_no |
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{ |
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XEvent event; |
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static int prevx, prevy; |
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static int deltax = 0, deltay = 0; |
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|
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x1 -= 0.1; y1 -= 0.1; z1 -= 0.1; |
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x2 += 0.1; y2 += 0.1; z2 += 0.2; |
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glEndList (); |
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|
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bool changed = true; |
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const bool hwaccum = false; // hwaccum does not work |
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|
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// the following are only initialized to prevent a compiler warning |
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double xoffset = -1; |
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double yoffset = -1; |
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double stepsize = -1; |
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bool even = false; |
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double weight = -1; |
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|
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bool antialias = false; |
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static bool buttondown = false; |
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|
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static unsigned long vX, vY, vW, vH, wW, wH, wWHD; // must(!) be static |
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|
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// swaccum |
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typedef unsigned char pix_t; |
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typedef unsigned long acc_t; |
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const int acc_scale = 1 << 24; |
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pix_t *pixbuf = 0; // read pixel buffer |
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acc_t *accumbuf = 0; // our accumbuf |
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acc_t accsum; |
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|
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for (bool loop = true; loop; ) |
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{ |
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antialias = antialias || !buttondown; |
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|
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if (buttondown || !antialias || XPending (dpy)) |
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do |
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{ |
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char buf[31]; |
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KeySym keysym; |
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|
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XNextEvent (dpy, &event); |
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switch (event.type) |
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{ |
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case Expose: |
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break; |
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|
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case ConfigureNotify: |
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{ |
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/* this approach preserves a 1:1 viewport aspect ratio */ |
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int eW = event.xconfigure.width, eH = event.xconfigure.height; |
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|
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eW = eW & ~3; // for alignment purposes |
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|
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if (eW != wW || eH != wH) |
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{ |
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changed = true; |
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wW = eW; wH = eH; |
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wWHD = wW * wH * fb_depth; |
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|
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if (eW >= eH) |
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{ |
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vX = 0; |
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vY = (eH - eW) >> 1; |
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vW = vH = eW; |
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} |
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else |
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{ |
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vX = (eW - eH) >> 1; |
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vY = 0; |
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vW = vH = eH; |
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} |
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|
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glViewport (vX, vY, vW, vH); |
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} |
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} |
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break; |
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|
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case KeyPress: |
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(void) XLookupString (&event.xkey, buf, sizeof (buf), &keysym, NULL); |
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switch (keysym) |
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{ |
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case XK_a: |
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antialias = true; |
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break; |
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case XK_q: |
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case XK_Escape: |
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loop = false; |
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break; |
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default: |
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break; |
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} |
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break; |
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|
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case ButtonPress: |
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prevx = event.xbutton.x; |
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prevy = event.xbutton.y; |
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buttondown = true; |
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break; |
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|
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case ButtonRelease: |
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buttondown = false; |
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break; |
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|
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case MotionNotify: |
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deltax += (event.xbutton.x - prevx); |
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prevx = event.xbutton.x; |
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deltay += (event.xbutton.y - prevy); |
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prevy = event.xbutton.y; |
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changed = true; |
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break; |
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|
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default: |
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break; |
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} |
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} |
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while (XPending (dpy)); |
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|
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if (changed || buttondown) |
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{ |
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changed = false; |
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stepsize = 2; |
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xoffset = 0; |
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yoffset = 0; |
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even = false; |
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weight = 1; |
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|
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if (hwaccum) |
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glClear(GL_ACCUM_BUFFER_BIT); |
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else |
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{ |
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free (pixbuf); pixbuf = 0; |
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free (accumbuf); accumbuf = 0; |
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accsum = 0; |
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} |
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} |
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|
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glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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|
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glMatrixMode(GL_MODELVIEW); |
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glPushMatrix (); |
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|
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glRotated ( deltax, 0, 1, 0); |
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glRotated (-deltay, 1, 0, 1); |
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|
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double sc; |
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|
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sc = abs(4/(x2-x1)); |
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if (abs (4/(y2-y1)) < sc) sc = abs(4/(y2-y1)); |
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if (abs (4/(z2-z1)) < sc) sc = abs(4/(z2-z1)); |
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glScaled (sc, sc, -sc); |
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|
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glTranslated (-0.5*(x2+x1),-0.5*(y2+y1), -0.5*(z1+z2)); |
| 293 |
|
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glMatrixMode(GL_PROJECTION); |
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glPushMatrix (); |
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glTranslated (xoffset*10/vW, yoffset*10/vH, 0); |
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|
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glCallList (TREE_LIST); |
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|
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glPopMatrix (); |
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glMatrixMode(GL_MODELVIEW); |
| 302 |
glPopMatrix (); |
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|
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if (buttondown || !antialias) |
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{ |
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glXSwapBuffers (dpy, win); |
| 307 |
continue; |
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} |
| 309 |
|
| 310 |
if (hwaccum) |
| 311 |
glAccum (GL_ACCUM, weight); |
| 312 |
else |
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{ |
| 314 |
if (!pixbuf ) pixbuf = (pix_t *) malloc (wWHD * sizeof (pix_t)); |
| 315 |
if (!accumbuf) accumbuf = (acc_t *) calloc (wWHD , sizeof (acc_t)); |
| 316 |
|
| 317 |
glReadPixels (0, 0, wW, wH, fb_format, GL_UNSIGNED_BYTE, pixbuf); |
| 318 |
|
| 319 |
acc_t scale[256]; // 256 == pix_t range |
| 320 |
for (int t = 0; t < 256; t++) |
| 321 |
scale[t] = acc_t (float (t) * acc_scale * weight); |
| 322 |
|
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pix_t *p; |
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acc_t *a; |
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for (p = pixbuf, a = accumbuf; |
| 326 |
p < pixbuf + wWHD; |
| 327 |
p++, a++) |
| 328 |
*a += scale[*p]; |
| 329 |
} |
| 330 |
|
| 331 |
cout << setw(9) << stepsize << " " |
| 332 |
<< setw(9) << 1 - yoffset << "\r" << flush; |
| 333 |
|
| 334 |
xoffset += even ? stepsize*0.5 : stepsize; |
| 335 |
if (xoffset >= 1.0) |
| 336 |
{ |
| 337 |
yoffset += stepsize*0.5; |
| 338 |
if (yoffset >= 1.0) |
| 339 |
{ |
| 340 |
if (hwaccum) |
| 341 |
{ |
| 342 |
glAccum (GL_RETURN, 1.); |
| 343 |
glXSwapBuffers (dpy, win); |
| 344 |
glAccum (GL_MULT, 0.25); |
| 345 |
} |
| 346 |
else |
| 347 |
{ |
| 348 |
pix_t *p; |
| 349 |
acc_t *a; |
| 350 |
for (p = pixbuf, a = accumbuf; |
| 351 |
p < pixbuf + wWHD; |
| 352 |
p++, a++) |
| 353 |
{ |
| 354 |
*p = *a / acc_scale; |
| 355 |
*a /= 4; |
| 356 |
} |
| 357 |
|
| 358 |
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 359 |
|
| 360 |
glMatrixMode (GL_MODELVIEW); |
| 361 |
glPushMatrix (); |
| 362 |
glLoadIdentity (); |
| 363 |
glMatrixMode (GL_PROJECTION); |
| 364 |
glPushMatrix (); |
| 365 |
glLoadIdentity (); |
| 366 |
|
| 367 |
glRasterPos2f (float(-vX) / float(vW / 2) - 1, float(-vY) / float(vH / 2) - 1); |
| 368 |
glDrawPixels (wW, wH, fb_format, GL_UNSIGNED_BYTE, pixbuf); |
| 369 |
glPopMatrix (); |
| 370 |
|
| 371 |
glMatrixMode (GL_MODELVIEW); |
| 372 |
glPopMatrix (); |
| 373 |
|
| 374 |
glXSwapBuffers (dpy, win); |
| 375 |
|
| 376 |
accsum /= 4; |
| 377 |
} |
| 378 |
|
| 379 |
yoffset = 0; |
| 380 |
even = true; |
| 381 |
stepsize *= 0.5; |
| 382 |
weight *= 0.25; |
| 383 |
antialias = false; |
| 384 |
} |
| 385 |
|
| 386 |
even = !even; |
| 387 |
xoffset = even ? 0 : stepsize*0.5; |
| 388 |
} |
| 389 |
|
| 390 |
} |
| 391 |
|
| 392 |
free (pixbuf); |
| 393 |
free (accumbuf); |
| 394 |
|
| 395 |
glDeleteLists (TREE_LIST, 1); |
| 396 |
} |
| 397 |
|
| 398 |
void gl_int::clip (const vec &v) t_no |
| 399 |
{ |
| 400 |
if (x1 > v[0]) x1 = v[0]; |
| 401 |
if (y1 > v[1]) y1 = v[1]; |
| 402 |
if (z1 > v[2]) z1 = v[2]; |
| 403 |
|
| 404 |
if (x2 < v[0]) x2 = v[0]; |
| 405 |
if (y2 < v[1]) y2 = v[1]; |
| 406 |
if (z2 < v[2]) z2 = v[2]; |
| 407 |
} |
| 408 |
|
| 409 |
void gl_int::check_attrs (const attribute_set &attr) t_err |
| 410 |
{ |
| 411 |
vec v; |
| 412 |
|
| 413 |
if (!in_begin) |
| 414 |
glLineWidth (attr ("width",1)); |
| 415 |
|
| 416 |
v = attr("color", vec( 1, 1, 1)); |
| 417 |
float col[4]; |
| 418 |
col[0] = v[0]; |
| 419 |
col[1] = v[1]; |
| 420 |
col[2] = v[2]; |
| 421 |
col[3] = 1.0; |
| 422 |
glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, col); |
| 423 |
} |
| 424 |
|
| 425 |
void gl_int::segment (const point &a, const point &b) t_err |
| 426 |
{ |
| 427 |
check_attrs (a.attr); |
| 428 |
|
| 429 |
Begin (GL_LINES); |
| 430 |
glNormal (vec (0, 0, 0)); |
| 431 |
glVertex (a.v); clip(a.v); |
| 432 |
glVertex (b.v); clip(b.v); |
| 433 |
End (); |
| 434 |
} |
| 435 |
|
| 436 |
void gl_int::object (const points &v) t_err |
| 437 |
{ |
| 438 |
// cerr << "polygon "; for (points::const_iterator j = v.begin (); j != v.end (); j++) cerr << j->first << " "; cerr << endl; |
| 439 |
if (v.size () < 3) |
| 440 |
return; |
| 441 |
|
| 442 |
glFrontFace (winding (v) > 0 ? GL_CCW : GL_CW); |
| 443 |
|
| 444 |
check_attrs (v.front ().attr); |
| 445 |
|
| 446 |
Begin (GL_POLYGON); |
| 447 |
for(points::const_iterator i = v.begin (); i != v.end(); ++i) |
| 448 |
{ |
| 449 |
check_attrs (i->attr); |
| 450 |
glNormal (i->n); |
| 451 |
glVertex (i->v); |
| 452 |
clip (i->v); |
| 453 |
} |
| 454 |
End (); |
| 455 |
|
| 456 |
double len; |
| 457 |
|
| 458 |
if ((len = v.front ().attr ("draw_normals", 0))) |
| 459 |
{ |
| 460 |
glNormal (vec (0, 0, 0)); |
| 461 |
|
| 462 |
Begin (GL_LINES); |
| 463 |
for(points::const_iterator i = v.begin (); i != v.end(); ++i) |
| 464 |
{ |
| 465 |
glVertex (i->v); |
| 466 |
glVertex (i->v + len * i->n); |
| 467 |
} |
| 468 |
End (); |
| 469 |
} |
| 470 |
} |
| 471 |
|
| 472 |
#endif |
| 473 |
|
