| 1 |
/* |
| 2 |
* math support |
| 3 |
* most of the more complicated code is taken from mesa. |
| 4 |
*/ |
| 5 |
|
| 6 |
#include <cstdio> // ugly |
| 7 |
#include <cmath> |
| 8 |
|
| 9 |
#include <sys/time.h> |
| 10 |
#include <time.h> |
| 11 |
#include <GL/gl.h> |
| 12 |
|
| 13 |
#include "util.h" |
| 14 |
#include "entity.h" |
| 15 |
|
| 16 |
#define DEG2RAD (M_PI / 180.) |
| 17 |
|
| 18 |
void renormalize (sector &s, point &p) |
| 19 |
{ |
| 20 |
float i; |
| 21 |
|
| 22 |
p.x = modff (p.x, &i); s.x += (soffs)i; |
| 23 |
p.y = modff (p.y, &i); s.y += (soffs)i; |
| 24 |
p.z = modff (p.z, &i); s.z += (soffs)i; |
| 25 |
} |
| 26 |
|
| 27 |
///////////////////////////////////////////////////////////////////////////// |
| 28 |
|
| 29 |
const vec3 normalize (const vec3 &v) |
| 30 |
{ |
| 31 |
GLfloat s = abs (v); |
| 32 |
|
| 33 |
if (!s) |
| 34 |
return v; |
| 35 |
|
| 36 |
s = 1. / s; |
| 37 |
return vec3 (v.x * s, v.y * s, v.z * s); |
| 38 |
} |
| 39 |
|
| 40 |
const vec3 cross (const vec3 &a, const vec3 &b) |
| 41 |
{ |
| 42 |
return vec3 ( |
| 43 |
a.y * b.z - a.z * b.y, |
| 44 |
a.z * b.x - a.x * b.z, |
| 45 |
a.x * b.y - a.y * b.x |
| 46 |
); |
| 47 |
} |
| 48 |
|
| 49 |
///////////////////////////////////////////////////////////////////////////// |
| 50 |
|
| 51 |
void matrix::diagonal (GLfloat v) |
| 52 |
{ |
| 53 |
for (int i = 4; i--; ) |
| 54 |
for (int j = 4; j--; ) |
| 55 |
data[i][j] = i == j ? v : 0.; |
| 56 |
} |
| 57 |
|
| 58 |
const matrix operator *(const matrix &a, const matrix &b) |
| 59 |
{ |
| 60 |
matrix r; |
| 61 |
|
| 62 |
// taken from mesa |
| 63 |
for (int i = 0; i < 4; i++) |
| 64 |
{ |
| 65 |
const GLfloat ai0=a(i,0), ai1=a(i,1), ai2=a(i,2), ai3=a(i,3); |
| 66 |
|
| 67 |
r(i,0) = ai0 * b(0,0) + ai1 * b(1,0) + ai2 * b(2,0) + ai3 * b(3,0); |
| 68 |
r(i,1) = ai0 * b(0,1) + ai1 * b(1,1) + ai2 * b(2,1) + ai3 * b(3,1); |
| 69 |
r(i,2) = ai0 * b(0,2) + ai1 * b(1,2) + ai2 * b(2,2) + ai3 * b(3,2); |
| 70 |
r(i,3) = ai0 * b(0,3) + ai1 * b(1,3) + ai2 * b(2,3) + ai3 * b(3,3); |
| 71 |
} |
| 72 |
|
| 73 |
return r; |
| 74 |
} |
| 75 |
|
| 76 |
const matrix matrix::rotation (GLfloat angle, const vec3 &axis) |
| 77 |
{ |
| 78 |
GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c, s, c; |
| 79 |
|
| 80 |
s = (GLfloat) sinf (angle * DEG2RAD); |
| 81 |
c = (GLfloat) cosf (angle * DEG2RAD); |
| 82 |
|
| 83 |
const GLfloat mag = abs (axis); |
| 84 |
|
| 85 |
if (mag <= 1.0e-4) |
| 86 |
return matrix (1); |
| 87 |
|
| 88 |
matrix m; |
| 89 |
const vec3 n = axis * (1. / mag); |
| 90 |
|
| 91 |
xx = n.x * n.x; |
| 92 |
yy = n.y * n.y; |
| 93 |
zz = n.z * n.z; |
| 94 |
xy = n.x * n.y; |
| 95 |
yz = n.y * n.z; |
| 96 |
zx = n.z * n.x; |
| 97 |
xs = n.x * s; |
| 98 |
ys = n.y * s; |
| 99 |
zs = n.z * s; |
| 100 |
one_c = 1.0F - c; |
| 101 |
|
| 102 |
m(0,0) = (one_c * xx) + c; |
| 103 |
m(0,1) = (one_c * xy) - zs; |
| 104 |
m(0,2) = (one_c * zx) + ys; |
| 105 |
m(0,3) = 0; |
| 106 |
|
| 107 |
m(1,0) = (one_c * xy) + zs; |
| 108 |
m(1,1) = (one_c * yy) + c; |
| 109 |
m(1,2) = (one_c * yz) - xs; |
| 110 |
m(1,3) = 0; |
| 111 |
|
| 112 |
m(2,0) = (one_c * zx) - ys; |
| 113 |
m(2,1) = (one_c * yz) + xs; |
| 114 |
m(2,2) = (one_c * zz) + c; |
| 115 |
m(2,3) = 0; |
| 116 |
|
| 117 |
m(3,0) = 0; |
| 118 |
m(3,1) = 0; |
| 119 |
m(3,2) = 0; |
| 120 |
m(3,3) = 1; |
| 121 |
|
| 122 |
return m; |
| 123 |
} |
| 124 |
|
| 125 |
const vec3 operator *(const matrix &a, const vec3 &v) |
| 126 |
{ |
| 127 |
return vec3 ( |
| 128 |
a(0,0) * v.x + a(0,1) * v.y + a(0,2) * v.z + a(0,3), |
| 129 |
a(1,0) * v.x + a(1,1) * v.y + a(1,2) * v.z + a(1,3), |
| 130 |
a(2,0) * v.x + a(2,1) * v.y + a(2,2) * v.z + a(2,3) |
| 131 |
); |
| 132 |
} |
| 133 |
|
| 134 |
void matrix::print () |
| 135 |
{ |
| 136 |
printf ("\n"); |
| 137 |
printf ("[ %f, %f, %f, %f ]\n", data[0][0], data[1][0], data[2][0], data[3][0]); |
| 138 |
printf ("[ %f, %f, %f, %f ]\n", data[0][1], data[1][1], data[2][1], data[3][1]); |
| 139 |
printf ("[ %f, %f, %f, %f ]\n", data[0][2], data[1][2], data[2][2], data[3][2]); |
| 140 |
printf ("[ %f, %f, %f, %f ]\n", data[0][3], data[1][3], data[2][3], data[3][3]); |
| 141 |
} |
| 142 |
|
| 143 |
const matrix matrix::translation (const vec3 &v) |
| 144 |
{ |
| 145 |
matrix m(1); |
| 146 |
|
| 147 |
m(0,3) = v.x; |
| 148 |
m(1,3) = v.y; |
| 149 |
m(2,3) = v.z; |
| 150 |
|
| 151 |
return m; |
| 152 |
} |
| 153 |
|
| 154 |
///////////////////////////////////////////////////////////////////////////// |
| 155 |
|
| 156 |
plane::plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d) |
| 157 |
: n (vec3 (a,b,c)) |
| 158 |
{ |
| 159 |
GLfloat s = 1. / abs (n); |
| 160 |
|
| 161 |
n = n * s; |
| 162 |
this->d = d * s; |
| 163 |
} |
| 164 |
|
| 165 |
///////////////////////////////////////////////////////////////////////////// |
| 166 |
|
| 167 |
void box::add (const box &o) |
| 168 |
{ |
| 169 |
a.x = min (a.x, o.a.x); |
| 170 |
a.y = min (a.y, o.a.y); |
| 171 |
a.z = min (a.z, o.a.z); |
| 172 |
b.x = max (b.x, o.b.x); |
| 173 |
b.y = max (b.y, o.b.y); |
| 174 |
b.z = max (b.z, o.b.z); |
| 175 |
} |
| 176 |
|
| 177 |
void box::add (const sector &p) |
| 178 |
{ |
| 179 |
a.x = min (a.x, p.x); |
| 180 |
a.y = min (a.y, p.y); |
| 181 |
a.z = min (a.z, p.z); |
| 182 |
b.x = max (b.x, p.x); |
| 183 |
b.y = max (b.y, p.y); |
| 184 |
b.z = max (b.z, p.z); |
| 185 |
} |
| 186 |
|
| 187 |
void box::add (const point &p) |
| 188 |
{ |
| 189 |
a.x = min (a.x, (soffs)floorf (p.x)); |
| 190 |
a.y = min (a.y, (soffs)floorf (p.y)); |
| 191 |
a.z = min (a.z, (soffs)floorf (p.z)); |
| 192 |
b.x = max (b.x, (soffs)ceilf (p.x)); |
| 193 |
b.y = max (b.y, (soffs)ceilf (p.y)); |
| 194 |
b.z = max (b.z, (soffs)ceilf (p.z)); |
| 195 |
} |
| 196 |
|
| 197 |
///////////////////////////////////////////////////////////////////////////// |
| 198 |
|
| 199 |
struct timer timer; |
| 200 |
static double base; |
| 201 |
double timer::now = 0.; |
| 202 |
double timer::diff; |
| 203 |
|
| 204 |
void timer::frame () |
| 205 |
{ |
| 206 |
struct timeval tv; |
| 207 |
gettimeofday (&tv, 0); |
| 208 |
|
| 209 |
double next = tv.tv_sec - base + tv.tv_usec / 1.e6; |
| 210 |
|
| 211 |
diff = next - now; |
| 212 |
now = next; |
| 213 |
} |
| 214 |
|
| 215 |
timer::timer () |
| 216 |
{ |
| 217 |
struct timeval tv; |
| 218 |
gettimeofday (&tv, 0); |
| 219 |
base = tv.tv_sec + tv.tv_usec / 1.e6; |
| 220 |
} |
| 221 |
|
| 222 |
GLuint SDL_GL_LoadTexture (SDL_Surface * surface, GLfloat * texcoord) |
| 223 |
{ |
| 224 |
GLuint texture; |
| 225 |
int w, h; |
| 226 |
SDL_Surface *image; |
| 227 |
SDL_Rect area; |
| 228 |
Uint32 saved_flags; |
| 229 |
Uint8 saved_alpha; |
| 230 |
|
| 231 |
/* Use the surface width and height expanded to powers of 2 */ |
| 232 |
//w = power_of_two (surface->w); |
| 233 |
//h = power_of_two (surface->h); |
| 234 |
w = power_of_two (surface->w); |
| 235 |
h = power_of_two (surface->h); |
| 236 |
texcoord[0] = 0.0f; /* Min X */ |
| 237 |
texcoord[1] = 0.0f; /* Min Y */ |
| 238 |
texcoord[2] = (GLfloat) surface->w / w; /* Max X */ |
| 239 |
texcoord[3] = (GLfloat) surface->h / h; /* Max Y */ |
| 240 |
|
| 241 |
image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32, |
| 242 |
#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ |
| 243 |
0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 |
| 244 |
#else |
| 245 |
0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF |
| 246 |
#endif |
| 247 |
); |
| 248 |
if (image == NULL) |
| 249 |
{ |
| 250 |
return 0; |
| 251 |
} |
| 252 |
|
| 253 |
/* Save the alpha blending attributes */ |
| 254 |
saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK); |
| 255 |
saved_alpha = surface->format->alpha; |
| 256 |
if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA) |
| 257 |
{ |
| 258 |
SDL_SetAlpha (surface, 0, 0); |
| 259 |
} |
| 260 |
|
| 261 |
/* Copy the surface into the GL texture image */ |
| 262 |
area.x = 0; |
| 263 |
area.y = 0; |
| 264 |
area.w = surface->w; |
| 265 |
area.h = surface->h; |
| 266 |
SDL_BlitSurface (surface, &area, image, &area); |
| 267 |
|
| 268 |
/* Restore the alpha blending attributes */ |
| 269 |
if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA) |
| 270 |
{ |
| 271 |
SDL_SetAlpha (surface, saved_flags, saved_alpha); |
| 272 |
} |
| 273 |
|
| 274 |
/* Create an OpenGL texture for the image */ |
| 275 |
glGenTextures (1, &texture); |
| 276 |
glBindTexture (GL_TEXTURE_2D, texture); |
| 277 |
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| 278 |
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| 279 |
glTexImage2D (GL_TEXTURE_2D, |
| 280 |
0, |
| 281 |
GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels); |
| 282 |
SDL_FreeSurface (image); /* No longer needed */ |
| 283 |
|
| 284 |
return texture; |
| 285 |
} |
| 286 |
|
| 287 |
void draw_some_random_funky_floor_dance_music (int size, int dx, int dy, int dz) |
| 288 |
{ |
| 289 |
int x, z, ry; |
| 290 |
|
| 291 |
for (x = 0; x < 100; x++) |
| 292 |
{ |
| 293 |
for (z = 0; z < 100; z++) |
| 294 |
{ |
| 295 |
vector<vertex2d> pts; |
| 296 |
pts.push_back (vertex2d (point (dx + (x * size), dy, dz + (z * size)), vec3 (0, 1, 0), texc (0, 0))); |
| 297 |
pts.push_back (vertex2d (point (dx + (x * size), dy, dz + ((z + 1) * size)), vec3 (0, 1, 0), texc (0, 1))); |
| 298 |
pts.push_back (vertex2d (point (dx + ((x + 1) * size), dy, dz + ((z + 1) * size)), vec3 (0, 1, 0), texc (1, 1))); |
| 299 |
pts.push_back (vertex2d (point (dx + ((x + 1) * size), dy, dz + (z * size)), vec3 (0, 1, 0), texc (1, 0))); |
| 300 |
|
| 301 |
entity_quads *q = new entity_quads; |
| 302 |
q->set (pts); |
| 303 |
q->show (); |
| 304 |
} |
| 305 |
} |
| 306 |
} |
| 307 |
|
| 308 |
//skedjuhlar main_scheduler; |
| 309 |
|
