git.rot13.org Git - simavr/blob - examples/board_reprap/src/reprap_gl.c

   1 /*
   2         reprap_gl.c
   3
   4         Copyright 2008-2012 Michel Pollet <buserror@gmail.com>
   5
   6         This file is part of simavr.
   7
   8         simavr is free software: you can redistribute it and/or modify
   9         it under the terms of the GNU General Public License as published by
  10         the Free Software Foundation, either version 3 of the License, or
  11         (at your option) any later version.
  12
  13         simavr is distributed in the hope that it will be useful,
  14         but WITHOUT ANY WARRANTY; without even the implied warranty of
  15         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16         GNU General Public License for more details.
  17
  18         You should have received a copy of the GNU General Public License
  19         along with simavr.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #if __APPLE__
  23 #define GL_GLEXT_PROTOTYPES
  24 #include <GLUT/glut.h>
  25 #include <OpenGL/gl.h>
  26 #include <OpenGL/glext.h>
  27 #else
  28 #define GL_GLEXT_PROTOTYPES
  29 #include <GL/gl.h>
  30 #include <GL/glut.h>
  31 #include <GL/glext.h>
  32 #endif
  33
  34 #include <stdio.h>
  35 #include <math.h>
  36
  37 #include "reprap.h"
  38 #include "reprap_gl.h"
  39
  40 #include "c3.h"
  41 #include "c3camera.h"
  42 #include "c3driver_context.h"
  43 #include "c3stl.h"
  44 #include "c3lines.h"
  45 #include "c3sphere.h"
  46 #include "c3program.h"
  47 #include "c3gl.h"
  48
  49 #include <cairo/cairo.h>
  50
  51 #define FBO 1
  52
  53 struct cairo_surface_t;
  54
  55 int _w = 800, _h = 600;
  56
  57 c3context_p c3 = NULL;
  58 c3context_p hud = NULL;
  59
  60 c3object_p head = NULL;         // hotend
  61 c3texture_p fbo_c3;                     // frame buffer object texture
  62 c3program_p fxaa = NULL;        // full screen antialias shader
  63
  64 int glsl_version = 110;
  65
  66 extern reprap_t reprap;
  67
  68 static int dumpError(const char * what)
  69 {
  70         GLenum e;
  71         int count = 0;
  72         while ((e = glGetError()) != GL_NO_ERROR) {
  73                 printf("%s: %s\n", what, gluErrorString(e));
  74                 count++;
  75         }
  76         return count;
  77 }
  78
  79 #define GLCHECK(_w) {_w; dumpError(#_w);}
  80
  81 /* Global */
  82 GLuint fbo, fbo_texture, rbo_depth;
  83 //GLuint vbo_fbo_vertices;
  84
  85 static void
  86 gl_offscreenInit(
  87                 int screen_width,
  88                 int screen_height)
  89 {
  90         /* init_resources */
  91         /* Create back-buffer, used for post-processing */
  92
  93         /* Texture */
  94         GLCHECK(glActiveTexture(GL_TEXTURE0));
  95         glGenTextures(1, &fbo_texture);
  96         glBindTexture(GL_TEXTURE_2D, fbo_texture);
  97         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  98         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  99         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 100         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 101         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, screen_width, screen_height, 0,
 102                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 103         glBindTexture(GL_TEXTURE_2D, 0);
 104
 105         /* Depth buffer */
 106         GLCHECK(glGenRenderbuffers(1, &rbo_depth));
 107         glBindRenderbuffer(GL_RENDERBUFFER, rbo_depth);
 108         glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, screen_width,
 109                 screen_height);
 110         glBindRenderbuffer(GL_RENDERBUFFER, 0);
 111
 112         /* Framebuffer to link everything together */
 113         GLCHECK(glGenFramebuffers(1, &fbo));
 114         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 115         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
 116                 fbo_texture, 0);
 117         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
 118                 GL_RENDERBUFFER, rbo_depth);
 119
 120         GLenum status;
 121         if ((status = glCheckFramebufferStatus(GL_FRAMEBUFFER))
 122                 != GL_FRAMEBUFFER_COMPLETE) {
 123                 fprintf(stderr, "glCheckFramebufferStatus: error %d", (int)status);
 124                 return ;
 125         }
 126 #if 0
 127         // Set the list of draw buffers.
 128         GLenum DrawBuffers[2] = {GL_COLOR_ATTACHMENT0};
 129         glDrawBuffers(1, DrawBuffers); // "1" is the size of DrawBuffers
 130         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 131 #endif
 132 }
 133
 134 void
 135 gl_offscreenReshape(
 136                 int screen_width,
 137                 int screen_height)
 138 {
 139 // Rescale FBO and RBO as well
 140         glBindTexture(GL_TEXTURE_2D, fbo_texture);
 141         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, screen_width, screen_height, 0,
 142                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 143         glBindTexture(GL_TEXTURE_2D, 0);
 144
 145         glBindRenderbuffer(GL_RENDERBUFFER, rbo_depth);
 146         glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, screen_width,
 147                 screen_height);
 148         glBindRenderbuffer(GL_RENDERBUFFER, 0);
 149 }
 150
 151 void gl_offscreenFree()
 152 {
 153         /* free_resources */
 154         glDeleteRenderbuffers(1, &rbo_depth);
 155         glDeleteTextures(1, &fbo_texture);
 156         glDeleteFramebuffers(1, &fbo);
 157 }
 158
 159 static void
 160 _gl_reshape_cb(int w, int h)
 161 {
 162     _w  = w;
 163     _h = h;
 164
 165         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 166     glViewport(0, 0, _w, _h);
 167     gl_offscreenReshape(_w, _h);
 168     glutPostRedisplay();
 169 }
 170
 171 static void
 172 _gl_key_cb(
 173                 unsigned char key,
 174                 int x,
 175                 int y)  /* called on key press */
 176 {
 177         switch (key) {
 178                 case 'q':
 179                 //      avr_vcd_stop(&vcd_file);
 180                         c3context_dispose(c3);
 181                         exit(0);
 182                         break;
 183                 case 'r':
 184                         printf("Starting VCD trace; press 's' to stop\n");
 185                 //      avr_vcd_start(&vcd_file);
 186                         break;
 187                 case 's':
 188                         printf("Stopping VCD trace\n");
 189                 //      avr_vcd_stop(&vcd_file);
 190                         break;
 191                 case '1':
 192                         if (fbo_c3->geometry.mat.program)
 193                                 fbo_c3->geometry.mat.program = NULL;
 194                         else
 195                                 fbo_c3->geometry.mat.program = fxaa;
 196                         glutPostRedisplay();
 197                         break;
 198         }
 199 }
 200
 201 static void
 202 _gl_display_cb(void)            /* function called whenever redisplay needed */
 203 {
 204 #if FBO
 205         /*
 206          * Draw in FBO object
 207          */
 208         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 209         // draw (without glutSwapBuffers)
 210         dumpError("glBindFramebuffer fbo");
 211         glViewport(0, 0, _w, _h);
 212
 213 #else
 214         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 215 #endif
 216
 217         c3context_view_set(c3, 0);
 218         c3vec3 headp = c3vec3f(
 219                         stepper_get_position_mm(&reprap.step_x),
 220                         stepper_get_position_mm(&reprap.step_y),
 221                         stepper_get_position_mm(&reprap.step_z));
 222         c3mat4 headmove = translation3D(headp);
 223         c3transform_set(head->transform.e[0], &headmove);
 224
 225         if (c3->root->dirty) {
 226         //      printf("reproject head %.2f,%.2f,%.2f\n", headp.x, headp.y,headp.z);
 227                 c3context_project(c3);
 228         }
 229         float z_min = c3context_view_get(c3)->z.min,
 230                         z_max = c3context_view_get(c3)->z.max;
 231         if (z_min < 0)
 232                 z_min = 10;
 233         z_min = 10;
 234         if (z_max < z_min || z_max > 1000)
 235                 z_max = 1000;
 236
 237         glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
 238         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 239
 240         // Set up projection matrix
 241         glMatrixMode(GL_PROJECTION); // Select projection matrix
 242         c3mat4 p = perspective3D(50, (float)_w / (float)_h, z_min, z_max);
 243         glLoadMatrixf(p.n);
 244
 245 #if 0
 246         glCullFace(GL_BACK);
 247         glEnable(GL_CULL_FACE);
 248 #endif
 249         glDepthMask(GL_TRUE);
 250         glDepthFunc(GL_LEQUAL);
 251         glEnable(GL_DEPTH_TEST);
 252         glEnable(GL_LIGHTING);
 253 //      glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 254
 255         glEnable(GL_ALPHA_TEST);
 256         glAlphaFunc(GL_GREATER, 1.0f / 255.0f);
 257         glEnable(GL_BLEND); // Enable Blending
 258         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // Type Of Blending To Use
 259
 260         glMatrixMode(GL_MODELVIEW);
 261
 262         c3context_draw(c3);
 263
 264 #if FBO
 265         /*
 266          * Draw back FBO over the screen
 267          */
 268         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 269         dumpError("glBindFramebuffer 0");
 270
 271         glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
 272         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 273 #endif
 274         glDisable(GL_DEPTH_TEST);
 275         glDisable(GL_LIGHTING);
 276         glDisable(GL_ALPHA_TEST);
 277
 278         glUseProgram(0);
 279
 280         glMatrixMode(GL_PROJECTION); // Select projection matrix
 281         glLoadIdentity(); // Start with an identity matrix
 282         glOrtho(0, _w, 0, _h, 0, 10);
 283         glScalef(1, -1, 1);
 284         glTranslatef(0, -1 * _h, 0);
 285         glMatrixMode(GL_MODELVIEW); // Select modelview matrix
 286
 287         if (hud)
 288                 c3context_draw(hud);
 289
 290     glutSwapBuffers();
 291 }
 292
 293 #if !defined(GLUT_WHEEL_UP)
 294 #  define GLUT_WHEEL_UP   3
 295 #  define GLUT_WHEEL_DOWN 4
 296 #endif
 297
 298
 299 int button;
 300 c3vec2 move;
 301
 302 static
 303 void _gl_button_cb(
 304                 int b,
 305                 int s,
 306                 int x,
 307                 int y)
 308 {
 309         button = s == GLUT_DOWN ? b : 0;
 310         move = c3vec2f(x, y);
 311         c3context_view_p view = c3context_view_get_at(c3, 0);
 312 //      printf("button %d: %.1f,%.1f\n", b, move.x, move.y);
 313         switch (b) {
 314                 case GLUT_LEFT_BUTTON:
 315                 case GLUT_RIGHT_BUTTON: // call motion
 316                         break;
 317                 case GLUT_WHEEL_UP:
 318                 case GLUT_WHEEL_DOWN:
 319                         if (view->cam.distance > 10) {
 320                                 const float d = 0.004;
 321                                 c3cam_set_distance(&view->cam,
 322                                                 view->cam.distance * ((b == GLUT_WHEEL_DOWN) ? (1.0+d) : (1.0-d)));
 323                                 c3cam_update_matrix(&view->cam);
 324                                 view->dirty = 1;        // resort the array
 325                         }
 326                         break;
 327         }
 328 }
 329
 330 void
 331 _gl_motion_cb(
 332                 int x,
 333                 int y)
 334 {
 335         c3vec2 m = c3vec2f(x, y);
 336         c3vec2 delta = c3vec2_sub(move, m);
 337         c3context_view_p view = c3context_view_get_at(c3, 0);
 338
 339 //      printf("%s b%d click %.1f,%.1f now %d,%d delta %.1f,%.1f\n",
 340 //                      __func__, button, move.n[0], move.n[1], x, y, delta.x, delta.y);
 341
 342         switch (button) {
 343                 case GLUT_LEFT_BUTTON: {
 344                         c3mat4 rotx = rotation3D(view->cam.side, delta.n[1] / 4);
 345                         c3mat4 roty = rotation3D(c3vec3f(0.0, 0.0, 1.0), delta.n[0] / 4);
 346                         rotx = c3mat4_mul(&rotx, &roty);
 347                         c3cam_rot_about_lookat(&view->cam, &rotx);
 348                         c3cam_update_matrix(&view->cam);
 349
 350                         view->dirty = 1;        // resort the array
 351                 }       break;
 352                 case GLUT_RIGHT_BUTTON: {
 353                         // offset both points, but following the plane
 354                         c3vec3 f = c3vec3_mulf(
 355                                         c3vec3f(-view->cam.side.y, view->cam.side.x, 0),
 356                                         -delta.n[1] / 4);
 357                         view->cam.eye = c3vec3_add(view->cam.eye, f);
 358                         view->cam.lookat = c3vec3_add(view->cam.lookat, f);
 359                         c3cam_movef(&view->cam, delta.n[0] / 8, 0, 0);
 360                         c3cam_update_matrix(&view->cam);
 361
 362                     view->dirty = 1;    // resort the array
 363                 }       break;
 364         }
 365         move = m;
 366 }
 367
 368 // gl timer. if the lcd is dirty, refresh display
 369 static void
 370 _gl_timer_cb(
 371                 int i)
 372 {
 373         glutTimerFunc(1000 / 24, _gl_timer_cb, 0);
 374         glutPostRedisplay();
 375 }
 376
 377 const c3driver_context_t * c3_driver_list[3] = { NULL, NULL };
 378
 379 int
 380 gl_init(
 381                 int argc,
 382                 char *argv[] )
 383 {
 384         glutInit(&argc, argv);          /* initialize GLUT system */
 385
 386         glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH | GLUT_ALPHA);
 387         glutInitWindowSize(_w, _h);             /* width=400pixels height=500pixels */
 388         /*window =*/ glutCreateWindow("Press 'q' to quit");     /* create window */
 389
 390         glutDisplayFunc(_gl_display_cb);                /* set window's display callback */
 391         glutKeyboardFunc(_gl_key_cb);           /* set window's key callback */
 392         glutTimerFunc(1000 / 24, _gl_timer_cb, 0);
 393
 394         glutMouseFunc(_gl_button_cb);
 395         glutMotionFunc(_gl_motion_cb);
 396     glutReshapeFunc(_gl_reshape_cb);
 397
 398         glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
 399         glHint(GL_GENERATE_MIPMAP_HINT, GL_NICEST);
 400         /*
 401         glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
 402         glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
 403         glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
 404         glEnable(GL_LINE_SMOOTH);
 405          */
 406         // enable color tracking
 407         glEnable(GL_COLOR_MATERIAL);
 408         // set material properties which will be assigned by glColor
 409         glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
 410
 411         /* setup some lights */
 412         glShadeModel(GL_SMOOTH);
 413         glEnable(GL_LIGHTING);
 414         GLfloat global_ambient[] = { 0.5f, 0.5f, 0.5f, 1.0f };
 415         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, global_ambient);
 416
 417         {
 418                 GLfloat specular[] = {1.0f, 1.0f, 1.0f , 0.8f};
 419                 GLfloat position[] = { -30.0f, -30.0f, 200.0f, 1.0f };
 420                 glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
 421                 glLightfv(GL_LIGHT0, GL_POSITION, position);
 422                 glEnable(GL_LIGHT0);
 423         }
 424         {
 425                 GLfloat specular[] = {1.0f, 1.0f, 1.0f , 0.8f};
 426                 GLfloat position[] = { 250.0f, -50.0f, 100.0f, 1.0f };
 427                 glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
 428                 glLightfv(GL_LIGHT0, GL_POSITION, position);
 429                 glEnable(GL_LIGHT0);
 430         }
 431
 432         /*
 433          * Extract the GLSL version as a nuneric value for later
 434          */
 435         const char * glsl = (const char *)glGetString(GL_SHADING_LANGUAGE_VERSION);
 436         {
 437                 int M = 0, m = 0;
 438                 if (sscanf(glsl, "%d.%d", &M, &m) == 2)
 439                         glsl_version = (M * 100) + m;
 440
 441         }
 442         printf("GL_SHADING_LANGUAGE_VERSION %s = %d\n", glsl, glsl_version);
 443
 444         gl_offscreenInit(_w, _h);
 445
 446         c3_driver_list[0] = c3gl_getdriver();
 447
 448     c3 = c3context_new(_w, _h);
 449     c3->driver = c3_driver_list;
 450
 451     c3cam_p cam = &c3context_view_get_at(c3, 0)->cam;
 452         cam->lookat = c3vec3f(100.0, 100.0, 0.0);
 453         cam->eye = c3vec3f(100.0, -100.0, 100.0);
 454
 455     {
 456         const char *path = "gfx/hb.png";
 457         cairo_surface_t * image = cairo_image_surface_create_from_png (path);
 458         printf("image = %p %p\n", image, cairo_image_surface_get_data (image));
 459         c3texture_p b = c3texture_new(c3->root);
 460
 461         c3pixels_p dst = c3pixels_new(
 462                         cairo_image_surface_get_width (image),
 463                         cairo_image_surface_get_height (image),
 464                         4, cairo_image_surface_get_stride(image),
 465                         cairo_image_surface_get_data (image));
 466                 dst->name = str_new(path);
 467         b->geometry.mat.texture = dst;
 468         b->size = c3vec2f(200, 200);
 469                 b->geometry.mat.color = c3vec4f(1.0, 1.0, 1.0, 1.0);
 470 //          c3transform_new(head);
 471     }
 472     c3pixels_p line_aa_tex = NULL;
 473     {
 474         const char *path = "gfx/BlurryCircle.png";
 475         cairo_surface_t * image = cairo_image_surface_create_from_png (path);
 476         printf("image = %p %p\n", image, cairo_image_surface_get_data (image));
 477
 478 #if 0
 479         c3pixels_p dst = &b->pixels;
 480         c3pixels_init(dst,
 481                         cairo_image_surface_get_width (image),
 482                         cairo_image_surface_get_height (image),
 483                         1, cairo_image_surface_get_width (image),
 484                         NULL);
 485         c3pixels_alloc(dst);
 486         b->size = c3vec2f(32, 32);
 487         b->normalized = 1;
 488
 489         c3pixels_p src = c3pixels_new(
 490                         cairo_image_surface_get_width (image),
 491                         cairo_image_surface_get_height (image),
 492                         4, cairo_image_surface_get_stride(image),
 493                         cairo_image_surface_get_data (image));
 494
 495         uint32_t * _s = (uint32_t *)src->base;
 496         uint8_t * _d = (uint8_t *)dst->base;
 497         int max = 0;
 498         for (int i = 0; i < dst->h * dst->w; i++)
 499                 if ((_s[i] & 0xff) > max)
 500                         max = _s[i] & 0xff;
 501         for (int i = 0; i < dst->h * dst->w; i++)
 502                 *_d++ = ((_s[i] & 0xff) * 255) / max;// + (0xff - max);
 503         b->pixels.format = C3PIXEL_A;
 504 #else
 505         c3pixels_p dst = c3pixels_new(
 506                         cairo_image_surface_get_width (image),
 507                         cairo_image_surface_get_height (image),
 508                         4, cairo_image_surface_get_stride(image),
 509                         cairo_image_surface_get_data (image));
 510         dst->format = C3PIXEL_ARGB;
 511         dst->normalize = 1;
 512         dst->name = str_new(path);
 513         uint8_t * line = dst->base;
 514         for (int y = 0; y < dst->h; y++, line += dst->row) {
 515                 uint32_t *p = (uint32_t *)line;
 516                 for (int x = 0; x < dst->w; x++, p++) {
 517                         uint8_t b = *p;
 518                         *p = ((0xff - b) << 24);//|(b << 16)|(b << 8)|(b);
 519                 }
 520         }
 521 #endif
 522         line_aa_tex = dst;
 523 #if 0
 524         c3pixels_p p = dst;
 525         printf("struct { int w, h, stride, size, format; uint8_t pix[] } img = {\n"
 526                         "%d, %d, %d, %d, %d\n",
 527                         p->w, p->h, (int)p->row, p->psize, cairo_image_surface_get_format(image));
 528         for (int i = 0; i < 32; i++)
 529                 printf("0x%08x ", ((uint32_t*)p->base)[i]);
 530         printf("\n");
 531 #endif
 532     }
 533     c3object_p grid = c3object_new(c3->root);
 534     {
 535         for (int x = 0; x <= 20; x++) {
 536                 for (int y = 0; y <= 20; y++) {
 537                         c3vec3 p[4] = {
 538                                 c3vec3f(-1+x*10,y*10,0.01), c3vec3f(1+x*10,y*10,0.01),
 539                                 c3vec3f(x*10,-1+y*10,0.02), c3vec3f(x*10,1+y*10,0.02),
 540                         };
 541                 c3geometry_p g = c3geometry_new(
 542                                 c3geometry_type(C3_LINES_TYPE, 0), grid);
 543                 g->mat.color = c3vec4f(0.0, 0.0, 0.0, 0.8);
 544                 g->mat.texture = line_aa_tex;
 545                         c3lines_init(g, p, 4, 0.2);
 546                 }
 547         }
 548     }
 549     {   // light bulb
 550         c3geometry_p g = c3sphere_uv(c3->root, c3vec3f(-30.0f, -20.0f, 200.0f), 3, 10, 10);
 551         g->mat.color = c3vec4f(1.0, 1.0, 0.0, 1.0);
 552     }
 553
 554    if (0) {
 555                 c3vec3 p[4] = {
 556                         c3vec3f(-5,-5,1), c3vec3f(205,-5,1),
 557                 };
 558         c3geometry_p g = c3geometry_new(
 559                         c3geometry_type(C3_LINES_TYPE, 0), grid);
 560         g->mat.color = c3vec4f(0.0, 0.0, 0.0, 1.0);
 561         g->mat.texture = line_aa_tex;
 562         g->line.width = 2;
 563
 564                 c3vertex_array_insert(&g->vertice,
 565                                 g->vertice.count, p, 2);
 566
 567     }
 568     head = c3stl_load("gfx/buserror-nozzle-model.stl", c3->root);
 569     //head = c3object_new(c3->root);
 570     c3transform_new(head);
 571     if (head->geometry.count > 0) {
 572         c3geometry_factor(head->geometry.e[0], 0.1, (20 * M_PI) / 180.0);
 573         head->geometry.e[0]->mat.color = c3vec4f(0.6, 0.5, 0.0, 1.0);
 574     }
 575
 576 #if 0
 577     c3texture_p b = c3texture_new(head);
 578     c3pixels_init(&b->pixels, 64, 64, 4, 4 * 64, NULL);
 579     b->geometry.dirty = 1;
 580     memset(b->pixels.base, 0xff, 10 * b->pixels.row);
 581 #endif
 582
 583
 584     hud = c3context_new(_w, _h);
 585     hud->driver = c3_driver_list;
 586
 587     /*
 588      * This is the offscreen framebuffer where the 3D scene is drawn
 589      */
 590     if (FBO) {
 591         /*
 592          * need to insert a header since there is nothing to detect the version number
 593          * reliably without it, and __VERSION__ returns idiocy
 594          */
 595         char head[128];
 596         sprintf(head, "#version %d\n#define GLSL_VERSION %d\n", glsl_version, glsl_version);
 597
 598         fxaa = c3program_new("fxaa");
 599         c3program_array_add(&hud->programs, fxaa);
 600         c3program_load_shader(fxaa, GL_VERTEX_SHADER, head,
 601                         "gfx/postproc.vs", C3_PROGRAM_LOAD_UNIFORM);
 602         c3program_load_shader(fxaa, GL_FRAGMENT_SHADER, head,
 603                         "gfx/postproc.fs", C3_PROGRAM_LOAD_UNIFORM);
 604
 605         c3texture_p b = c3texture_new(hud->root);
 606
 607         c3pixels_p dst = c3pixels_new(_w, _h, 4, _w * 4, NULL);
 608                 dst->name = str_new("fbo");
 609                 dst->texture = (c3apiobject_t)fbo_texture;
 610                 dst->normalize = 1;
 611                 dst->dirty = 0;
 612         //      dst->trace = 1;
 613         b->geometry.mat.texture = dst;
 614         b->geometry.mat.program = fxaa;
 615         b->size = c3vec2f(_w, _h);
 616                 b->geometry.mat.color = c3vec4f(1.0, 1.0, 1.0, 1.0);
 617                 fbo_c3 = b;
 618     }
 619
 620     {
 621                 c3vec3 p[4] = {
 622                         c3vec3f(10,10,0), c3vec3f(800-10,10,0),
 623                 };
 624         c3geometry_p g = c3geometry_new(
 625                         c3geometry_type(C3_LINES_TYPE, 0), hud->root);
 626         g->mat.color = c3vec4f(0.5, 0.5, 1.0, .3f);
 627         g->mat.texture = line_aa_tex;
 628                 c3lines_init(g, p, 2, 10);
 629     }
 630         return 1;
 631 }
 632
 633 void
 634 gl_dispose()
 635 {
 636         c3context_dispose(c3);
 637 }
 638
 639 int
 640 gl_runloop()
 641 {
 642         glutMainLoop();
 643         gl_dispose();
 644         return 0;
 645 }