| 1 |
/* |
| 2 |
* math support |
| 3 |
* most of the more complicated code is taken from mesa. |
| 4 |
*/ |
| 5 |
|
| 6 |
#include <cstdio> // ugly |
| 7 |
#include <cstring> |
| 8 |
#include <cmath> |
| 9 |
|
| 10 |
#include <sys/time.h> |
| 11 |
#include <time.h> |
| 12 |
|
| 13 |
#include "opengl.h" |
| 14 |
|
| 15 |
#include "util.h" |
| 16 |
#include "entity.h" |
| 17 |
|
| 18 |
#define DEG2RAD (M_PI / 180.) |
| 19 |
|
| 20 |
void renormalize (sector &s, point &p) |
| 21 |
{ |
| 22 |
float i; |
| 23 |
|
| 24 |
p.x = modff (p.x, &i); s.x += (soffs)i; |
| 25 |
p.y = modff (p.y, &i); s.y += (soffs)i; |
| 26 |
p.z = modff (p.z, &i); s.z += (soffs)i; |
| 27 |
} |
| 28 |
|
| 29 |
///////////////////////////////////////////////////////////////////////////// |
| 30 |
|
| 31 |
const vec3 normalize (const vec3 &v) |
| 32 |
{ |
| 33 |
GLfloat s = length (v); |
| 34 |
|
| 35 |
if (!s) |
| 36 |
return v; |
| 37 |
|
| 38 |
s = 1. / s; |
| 39 |
return vec3 (v.x * s, v.y * s, v.z * s); |
| 40 |
} |
| 41 |
|
| 42 |
const vec3 cross (const vec3 &a, const vec3 &b) |
| 43 |
{ |
| 44 |
return vec3 ( |
| 45 |
a.y * b.z - a.z * b.y, |
| 46 |
a.z * b.x - a.x * b.z, |
| 47 |
a.x * b.y - a.y * b.x |
| 48 |
); |
| 49 |
} |
| 50 |
|
| 51 |
///////////////////////////////////////////////////////////////////////////// |
| 52 |
|
| 53 |
plane::plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d) |
| 54 |
: n (vec3 (a,b,c)) |
| 55 |
{ |
| 56 |
GLfloat s = 1. / length (n); |
| 57 |
|
| 58 |
n = n * s; |
| 59 |
this->d = d * s; |
| 60 |
} |
| 61 |
|
| 62 |
///////////////////////////////////////////////////////////////////////////// |
| 63 |
|
| 64 |
void box::add (const box &o) |
| 65 |
{ |
| 66 |
a.x = min (a.x, o.a.x); |
| 67 |
a.y = min (a.y, o.a.y); |
| 68 |
a.z = min (a.z, o.a.z); |
| 69 |
b.x = max (b.x, o.b.x); |
| 70 |
b.y = max (b.y, o.b.y); |
| 71 |
b.z = max (b.z, o.b.z); |
| 72 |
} |
| 73 |
|
| 74 |
void box::add (const point &p) |
| 75 |
{ |
| 76 |
a.x = min (a.x, p.x); |
| 77 |
a.y = min (a.y, p.y); |
| 78 |
a.z = min (a.z, p.z); |
| 79 |
b.x = max (b.x, p.x); |
| 80 |
b.y = max (b.y, p.y); |
| 81 |
b.z = max (b.z, p.z); |
| 82 |
} |
| 83 |
|
| 84 |
///////////////////////////////////////////////////////////////////////////// |
| 85 |
|
| 86 |
struct timer timer; |
| 87 |
static double base; |
| 88 |
double timer::now = 0.; |
| 89 |
double timer::diff; |
| 90 |
double timer::fps = 1.; |
| 91 |
double min_frame = 1. / 85.; |
| 92 |
//double min_frame = 1. / 1000.; |
| 93 |
|
| 94 |
void timer::frame () |
| 95 |
{ |
| 96 |
struct timeval tv; |
| 97 |
double next; |
| 98 |
|
| 99 |
gettimeofday (&tv, 0); |
| 100 |
|
| 101 |
next = tv.tv_sec - base + tv.tv_usec / 1.e6; |
| 102 |
diff = next - now; |
| 103 |
|
| 104 |
fps = fps * 0.9 + (1. / diff) * 0.1; |
| 105 |
|
| 106 |
if (diff < min_frame) |
| 107 |
{ |
| 108 |
SDL_Delay ((unsigned int)((min_frame - diff) * 1000.)); |
| 109 |
|
| 110 |
gettimeofday (&tv, 0); |
| 111 |
|
| 112 |
next = tv.tv_sec - base + tv.tv_usec / 1.e6; |
| 113 |
diff = next - now; |
| 114 |
} |
| 115 |
|
| 116 |
now = next; |
| 117 |
} |
| 118 |
|
| 119 |
timer::timer () |
| 120 |
{ |
| 121 |
struct timeval tv; |
| 122 |
gettimeofday (&tv, 0); |
| 123 |
base = tv.tv_sec + tv.tv_usec / 1.e6; |
| 124 |
} |
| 125 |
|
| 126 |
void render_text (GLint x, GLint y, const char *str) |
| 127 |
{ |
| 128 |
glRasterPos2i (x, y); |
| 129 |
|
| 130 |
#if 0 |
| 131 |
while (!*str) |
| 132 |
glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, *str++); |
| 133 |
#endif |
| 134 |
} |
| 135 |
|
| 136 |
namespace gl { |
| 137 |
|
| 138 |
void matrix::diagonal (GLfloat v) |
| 139 |
{ |
| 140 |
for (int i = 4; i--; ) |
| 141 |
for (int j = 4; j--; ) |
| 142 |
data[i][j] = i == j ? v : 0.; |
| 143 |
} |
| 144 |
|
| 145 |
const matrix operator *(const matrix &a, const matrix &b) |
| 146 |
{ |
| 147 |
matrix r; |
| 148 |
|
| 149 |
// taken from mesa |
| 150 |
for (int i = 0; i < 4; i++) |
| 151 |
{ |
| 152 |
const GLfloat ai0=a(i,0), ai1=a(i,1), ai2=a(i,2), ai3=a(i,3); |
| 153 |
|
| 154 |
r(i,0) = ai0 * b(0,0) + ai1 * b(1,0) + ai2 * b(2,0) + ai3 * b(3,0); |
| 155 |
r(i,1) = ai0 * b(0,1) + ai1 * b(1,1) + ai2 * b(2,1) + ai3 * b(3,1); |
| 156 |
r(i,2) = ai0 * b(0,2) + ai1 * b(1,2) + ai2 * b(2,2) + ai3 * b(3,2); |
| 157 |
r(i,3) = ai0 * b(0,3) + ai1 * b(1,3) + ai2 * b(2,3) + ai3 * b(3,3); |
| 158 |
} |
| 159 |
|
| 160 |
return r; |
| 161 |
} |
| 162 |
|
| 163 |
const matrix matrix::rotation (GLfloat angle, const vec3 &axis) |
| 164 |
{ |
| 165 |
GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c, s, c; |
| 166 |
|
| 167 |
s = (GLfloat) sinf (angle * DEG2RAD); |
| 168 |
c = (GLfloat) cosf (angle * DEG2RAD); |
| 169 |
|
| 170 |
const GLfloat mag = length (axis); |
| 171 |
|
| 172 |
if (mag <= 1.0e-4) |
| 173 |
return matrix (1); |
| 174 |
|
| 175 |
matrix m; |
| 176 |
const vec3 n = axis * (1. / mag); |
| 177 |
|
| 178 |
xx = n.x * n.x; |
| 179 |
yy = n.y * n.y; |
| 180 |
zz = n.z * n.z; |
| 181 |
xy = n.x * n.y; |
| 182 |
yz = n.y * n.z; |
| 183 |
zx = n.z * n.x; |
| 184 |
xs = n.x * s; |
| 185 |
ys = n.y * s; |
| 186 |
zs = n.z * s; |
| 187 |
one_c = 1.0F - c; |
| 188 |
|
| 189 |
m(0,0) = (one_c * xx) + c; |
| 190 |
m(0,1) = (one_c * xy) - zs; |
| 191 |
m(0,2) = (one_c * zx) + ys; |
| 192 |
m(0,3) = 0; |
| 193 |
|
| 194 |
m(1,0) = (one_c * xy) + zs; |
| 195 |
m(1,1) = (one_c * yy) + c; |
| 196 |
m(1,2) = (one_c * yz) - xs; |
| 197 |
m(1,3) = 0; |
| 198 |
|
| 199 |
m(2,0) = (one_c * zx) - ys; |
| 200 |
m(2,1) = (one_c * yz) + xs; |
| 201 |
m(2,2) = (one_c * zz) + c; |
| 202 |
m(2,3) = 0; |
| 203 |
|
| 204 |
m(3,0) = 0; |
| 205 |
m(3,1) = 0; |
| 206 |
m(3,2) = 0; |
| 207 |
m(3,3) = 1; |
| 208 |
|
| 209 |
return m; |
| 210 |
} |
| 211 |
|
| 212 |
const vec3 operator *(const matrix &a, const vec3 &v) |
| 213 |
{ |
| 214 |
return vec3 ( |
| 215 |
a(0,0) * v.x + a(0,1) * v.y + a(0,2) * v.z + a(0,3), |
| 216 |
a(1,0) * v.x + a(1,1) * v.y + a(1,2) * v.z + a(1,3), |
| 217 |
a(2,0) * v.x + a(2,1) * v.y + a(2,2) * v.z + a(2,3) |
| 218 |
); |
| 219 |
} |
| 220 |
|
| 221 |
void matrix::print () |
| 222 |
{ |
| 223 |
printf ("\n"); |
| 224 |
printf ("[ %f, %f, %f, %f ]\n", data[0][0], data[1][0], data[2][0], data[3][0]); |
| 225 |
printf ("[ %f, %f, %f, %f ]\n", data[0][1], data[1][1], data[2][1], data[3][1]); |
| 226 |
printf ("[ %f, %f, %f, %f ]\n", data[0][2], data[1][2], data[2][2], data[3][2]); |
| 227 |
printf ("[ %f, %f, %f, %f ]\n", data[0][3], data[1][3], data[2][3], data[3][3]); |
| 228 |
} |
| 229 |
|
| 230 |
const matrix matrix::translation (const vec3 &v) |
| 231 |
{ |
| 232 |
matrix m(1); |
| 233 |
|
| 234 |
m(0,3) = v.x; |
| 235 |
m(1,3) = v.y; |
| 236 |
m(2,3) = v.z; |
| 237 |
|
| 238 |
return m; |
| 239 |
} |
| 240 |
|
| 241 |
///////////////////////////////////////////////////////////////////////////// |
| 242 |
|
| 243 |
void draw_bbox (const sector &a, const sector &b) |
| 244 |
{ |
| 245 |
static vertex_buffer_object vb; |
| 246 |
static index_buffer_object ib; |
| 247 |
|
| 248 |
point pa(a), pb(b); |
| 249 |
|
| 250 |
vertex_v3f vd[] = { |
| 251 |
point (a.x, a.y, a.z), |
| 252 |
point (b.x, a.y, a.z), |
| 253 |
point (a.x, b.y, a.z), |
| 254 |
point (b.x, b.y, a.z), |
| 255 |
point (a.x, a.y, b.z), |
| 256 |
point (b.x, a.y, b.z), |
| 257 |
point (a.x, b.y, b.z), |
| 258 |
point (b.x, b.y, b.z), |
| 259 |
}; |
| 260 |
|
| 261 |
if (!ib) |
| 262 |
{ |
| 263 |
static index_ushort verts[4*6] = { |
| 264 |
0, 4, 6, 2, // -x |
| 265 |
1, 3, 7, 5, // +x |
| 266 |
0, 1, 5, 4, // -y |
| 267 |
7, 3, 2, 6, // +y |
| 268 |
0, 2, 3, 1, // -z |
| 269 |
4, 5, 7, 6, // +z |
| 270 |
}; |
| 271 |
|
| 272 |
ib.set (verts, 4*6, GL_STATIC_DRAW_ARB); |
| 273 |
} |
| 274 |
|
| 275 |
vb.set (vd, 8, GL_STREAM_DRAW_ARB); |
| 276 |
vb.bind (); |
| 277 |
ib.draw (GL_QUADS, 0, 6*4); |
| 278 |
} |
| 279 |
|
| 280 |
///////////////////////////////////////////////////////////////////////////// |
| 281 |
|
| 282 |
GLsizei format_stride (GLenum format) |
| 283 |
{ |
| 284 |
switch (format) |
| 285 |
{ |
| 286 |
case GL_V2F: abort (); |
| 287 |
case GL_V3F: return sizeof (vertex_v3f); |
| 288 |
case GL_C4UB_V2F: abort (); |
| 289 |
case GL_C4UB_V3F: abort (); |
| 290 |
case GL_C3F_V3F: abort (); |
| 291 |
case GL_N3F_V3F: abort (); |
| 292 |
case GL_C4F_N3F_V3F: abort (); |
| 293 |
case GL_T2F_V3F: abort (); |
| 294 |
case GL_T4F_V4F: abort (); |
| 295 |
case GL_T2F_C4UB_V3F: abort (); |
| 296 |
case GL_T2F_C3F_V3F: abort (); |
| 297 |
case GL_T2F_N3F_V3F: return sizeof (vertex_t2f_n3f_v3f); |
| 298 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 299 |
case GL_T4F_C4F_N3F_V4F: abort (); |
| 300 |
default: |
| 301 |
abort (); |
| 302 |
} |
| 303 |
} |
| 304 |
|
| 305 |
GLsizei format_offset_p (GLenum format) |
| 306 |
{ |
| 307 |
switch (format) |
| 308 |
{ |
| 309 |
case GL_V2F: abort (); |
| 310 |
case GL_V3F: { vertex_v3f v; return (char *)&v.p - (char *)&v; } |
| 311 |
case GL_C4UB_V2F: abort (); |
| 312 |
case GL_C4UB_V3F: abort (); |
| 313 |
case GL_C3F_V3F: abort (); |
| 314 |
case GL_N3F_V3F: abort (); |
| 315 |
case GL_C4F_N3F_V3F: abort (); |
| 316 |
case GL_T2F_V3F: abort (); |
| 317 |
case GL_T4F_V4F: abort (); |
| 318 |
case GL_T2F_C4UB_V3F: abort (); |
| 319 |
case GL_T2F_C3F_V3F: abort (); |
| 320 |
case GL_T2F_N3F_V3F: { vertex_t2f_n3f_v3f v; return (char *)&v.p - (char *)&v; } |
| 321 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 322 |
case GL_T4F_C4F_N3F_V4F: abort (); |
| 323 |
default: |
| 324 |
abort (); |
| 325 |
} |
| 326 |
} |
| 327 |
|
| 328 |
GLsizei format_offset_n (GLenum format) |
| 329 |
{ |
| 330 |
switch (format) |
| 331 |
{ |
| 332 |
case GL_V2F: abort (); |
| 333 |
case GL_V3F: abort (); |
| 334 |
case GL_C4UB_V2F: abort (); |
| 335 |
case GL_C4UB_V3F: abort (); |
| 336 |
case GL_C3F_V3F: abort (); |
| 337 |
case GL_N3F_V3F: abort (); |
| 338 |
case GL_C4F_N3F_V3F: abort (); |
| 339 |
case GL_T2F_V3F: abort (); |
| 340 |
case GL_T4F_V4F: abort (); |
| 341 |
case GL_T2F_C4UB_V3F: abort (); |
| 342 |
case GL_T2F_C3F_V3F: abort (); |
| 343 |
case GL_T2F_N3F_V3F: { vertex_t2f_n3f_v3f v; return (char *)&v.n - (char *)&v; } |
| 344 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 345 |
case GL_T4F_C4F_N3F_V4F: abort (); |
| 346 |
default: |
| 347 |
abort (); |
| 348 |
} |
| 349 |
} |
| 350 |
|
| 351 |
GLsizei format_offset_t (GLenum format) |
| 352 |
{ |
| 353 |
switch (format) |
| 354 |
{ |
| 355 |
case GL_V2F: abort (); |
| 356 |
case GL_V3F: abort (); |
| 357 |
case GL_C4UB_V2F: abort (); |
| 358 |
case GL_C4UB_V3F: abort (); |
| 359 |
case GL_C3F_V3F: abort (); |
| 360 |
case GL_N3F_V3F: abort (); |
| 361 |
case GL_C4F_N3F_V3F: abort (); |
| 362 |
case GL_T2F_V3F: abort (); |
| 363 |
case GL_T4F_V4F: abort (); |
| 364 |
case GL_T2F_C4UB_V3F: abort (); |
| 365 |
case GL_T2F_C3F_V3F: abort (); |
| 366 |
case GL_T2F_N3F_V3F: { vertex_t2f_n3f_v3f v; return (char *)&v.t - (char *)&v; } |
| 367 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 368 |
case GL_T4F_C4F_N3F_V4F: abort (); |
| 369 |
default: |
| 370 |
abort (); |
| 371 |
} |
| 372 |
} |
| 373 |
|
| 374 |
///////////////////////////////////////////////////////////////////////////// |
| 375 |
|
| 376 |
int nesting; |
| 377 |
|
| 378 |
void errchk (const char *name, const char *args, const char *file, int line) |
| 379 |
{ |
| 380 |
static int inbegin; |
| 381 |
|
| 382 |
if (name[2] == 'B' && !strcmp (name, "glBegin")) |
| 383 |
inbegin = 1; |
| 384 |
else if (name[2] == 'E' && !strcmp (name, "glEnd")) |
| 385 |
inbegin = 0; |
| 386 |
|
| 387 |
if (inbegin) |
| 388 |
return; |
| 389 |
|
| 390 |
GLenum gl_derror = glGetError (); |
| 391 |
if (gl_derror != GL_NO_ERROR) |
| 392 |
{ |
| 393 |
fprintf (stderr, "%s:%d [GLERROR %d,%s] %s(%s)\n", |
| 394 |
file, line, gl_derror, gluErrorString (gl_derror), name, args); |
| 395 |
abort (); |
| 396 |
} |
| 397 |
} |
| 398 |
|
| 399 |
} |
| 400 |
|
| 401 |
//skedjuhlar main_scheduler; |
| 402 |
|
