| 1 |
/* |
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* math support |
| 3 |
* most of the more complicated code is taken from mesa. |
| 4 |
*/ |
| 5 |
|
| 6 |
#include <cstdio> // ugly |
| 7 |
#include <cstring> |
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#include <cmath> |
| 9 |
|
| 10 |
#include <sys/time.h> |
| 11 |
#include <time.h> |
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|
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#include "opengl.h" |
| 14 |
|
| 15 |
#include "util.h" |
| 16 |
#include "entity.h" |
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|
| 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; |
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p.y = modff (p.y, &i); s.y += (soffs)i; |
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p.z = modff (p.z, &i); s.z += (soffs)i; |
| 27 |
} |
| 28 |
|
| 29 |
///////////////////////////////////////////////////////////////////////////// |
| 30 |
|
| 31 |
const vec3 normalize (const vec3 &v) |
| 32 |
{ |
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GLfloat s = length (v); |
| 34 |
|
| 35 |
if (!s) |
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return v; |
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|
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s = 1. / s; |
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return vec3 (v.x * s, v.y * s, v.z * s); |
| 40 |
} |
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|
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const vec3 cross (const vec3 &a, const vec3 &b) |
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{ |
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return vec3 ( |
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a.y * b.z - a.z * b.y, |
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a.z * b.x - a.x * b.z, |
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a.x * b.y - a.y * b.x |
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); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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plane::plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d) |
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: n (vec3 (a,b,c)) |
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{ |
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GLfloat s = 1. / length (n); |
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|
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n = n * s; |
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this->d = d * s; |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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void box::add (const box &o) |
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{ |
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a.x = min (a.x, o.a.x); |
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a.y = min (a.y, o.a.y); |
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a.z = min (a.z, o.a.z); |
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b.x = max (b.x, o.b.x); |
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b.y = max (b.y, o.b.y); |
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b.z = max (b.z, o.b.z); |
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} |
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|
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void box::add (const point &p) |
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{ |
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a.x = min (a.x, p.x); |
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a.y = min (a.y, p.y); |
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a.z = min (a.z, p.z); |
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b.x = max (b.x, p.x); |
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b.y = max (b.y, p.y); |
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b.z = max (b.z, p.z); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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struct timer timer; |
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static double base; |
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double timer::now = 0.; |
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double timer::diff; |
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double timer::fps = 1.; |
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double min_frame = 1. / 85.; |
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//double min_frame = 1. / 1000.; |
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|
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void timer::frame () |
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{ |
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struct timeval tv; |
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double next; |
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|
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gettimeofday (&tv, 0); |
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|
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next = tv.tv_sec - base + tv.tv_usec / 1.e6; |
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diff = next - now; |
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|
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fps = fps * 0.9 + (1. / diff) * 0.1; |
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|
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if (diff < min_frame) |
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{ |
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SDL_Delay ((unsigned int)((min_frame - diff) * 1000.)); |
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|
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gettimeofday (&tv, 0); |
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|
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next = tv.tv_sec - base + tv.tv_usec / 1.e6; |
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diff = next - now; |
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} |
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|
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now = next; |
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} |
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|
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timer::timer () |
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{ |
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struct timeval tv; |
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gettimeofday (&tv, 0); |
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base = tv.tv_sec + tv.tv_usec / 1.e6; |
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} |
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|
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void render_text (GLint x, GLint y, const char *str) |
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{ |
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glRasterPos2i (x, y); |
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|
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#if 0 |
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while (!*str) |
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glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, *str++); |
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#endif |
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} |
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|
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namespace gl { |
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|
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void matrix::diagonal (GLfloat v) |
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{ |
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for (int i = 4; i--; ) |
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for (int j = 4; j--; ) |
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data[i][j] = i == j ? v : 0.; |
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} |
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|
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matrix operator *(const matrix &a, const matrix &b) |
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{ |
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matrix r; |
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|
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// taken from mesa |
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for (int i = 0; i < 4; i++) |
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{ |
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const GLfloat ai0=a(i,0), ai1=a(i,1), ai2=a(i,2), ai3=a(i,3); |
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|
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r(i,0) = ai0 * b(0,0) + ai1 * b(1,0) + ai2 * b(2,0) + ai3 * b(3,0); |
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r(i,1) = ai0 * b(0,1) + ai1 * b(1,1) + ai2 * b(2,1) + ai3 * b(3,1); |
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r(i,2) = ai0 * b(0,2) + ai1 * b(1,2) + ai2 * b(2,2) + ai3 * b(3,2); |
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r(i,3) = ai0 * b(0,3) + ai1 * b(1,3) + ai2 * b(2,3) + ai3 * b(3,3); |
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} |
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|
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return r; |
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} |
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|
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matrix matrix::rotation (GLfloat angle, const vec3 &axis) |
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{ |
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GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c, s, c; |
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|
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s = (GLfloat) sinf (angle * DEG2RAD); |
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c = (GLfloat) cosf (angle * DEG2RAD); |
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|
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const GLfloat mag = length (axis); |
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|
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if (mag <= 1.0e-4) |
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return matrix (1); |
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|
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matrix m; |
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const vec3 n = axis * (1. / mag); |
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|
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xx = n.x * n.x; |
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yy = n.y * n.y; |
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zz = n.z * n.z; |
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xy = n.x * n.y; |
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yz = n.y * n.z; |
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zx = n.z * n.x; |
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xs = n.x * s; |
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ys = n.y * s; |
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zs = n.z * s; |
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one_c = 1.0F - c; |
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|
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m(0,0) = (one_c * xx) + c; |
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m(0,1) = (one_c * xy) - zs; |
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m(0,2) = (one_c * zx) + ys; |
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m(0,3) = 0; |
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|
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m(1,0) = (one_c * xy) + zs; |
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m(1,1) = (one_c * yy) + c; |
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m(1,2) = (one_c * yz) - xs; |
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m(1,3) = 0; |
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|
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m(2,0) = (one_c * zx) - ys; |
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m(2,1) = (one_c * yz) + xs; |
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m(2,2) = (one_c * zz) + c; |
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m(2,3) = 0; |
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|
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m(3,0) = 0; |
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m(3,1) = 0; |
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m(3,2) = 0; |
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m(3,3) = 1; |
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|
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return m; |
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} |
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|
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matrix matrix::translation (const vec3 &v) |
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{ |
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matrix m(1); |
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|
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m(0,3) = v.x; |
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m(1,3) = v.y; |
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m(2,3) = v.z; |
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|
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return m; |
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} |
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|
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matrix matrix::scaling (GLfloat sx, GLfloat sy, GLfloat sz, GLfloat sw) |
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{ |
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matrix m (1.F); |
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|
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m(0,0) = sx; |
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m(1,1) = sy; |
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m(2,2) = sz; |
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m(3,3) = sw; |
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|
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return m; |
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} |
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|
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vec3 operator *(const matrix &a, const vec3 &v) |
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{ |
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return vec3 ( |
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a(0,0) * v.x + a(0,1) * v.y + a(0,2) * v.z + a(0,3), |
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a(1,0) * v.x + a(1,1) * v.y + a(1,2) * v.z + a(1,3), |
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a(2,0) * v.x + a(2,1) * v.y + a(2,2) * v.z + a(2,3) |
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); |
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} |
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|
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void matrix::print () |
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{ |
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printf ("\n"); |
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printf ("[ %f, %f, %f, %f ]\n", data[0][0], data[1][0], data[2][0], data[3][0]); |
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printf ("[ %f, %f, %f, %f ]\n", data[0][1], data[1][1], data[2][1], data[3][1]); |
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printf ("[ %f, %f, %f, %f ]\n", data[0][2], data[1][2], data[2][2], data[3][2]); |
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printf ("[ %f, %f, %f, %f ]\n", data[0][3], data[1][3], data[2][3], data[3][3]); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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void draw_bbox (const sector &a, const sector &b) |
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{ |
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static vertex_buffer vb; |
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static index_buffer ib; |
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|
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point pa(a), pb(b); |
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|
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vertex_v3f vd[] = { |
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point (a.x, a.y, a.z), |
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point (b.x, a.y, a.z), |
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point (a.x, b.y, a.z), |
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point (b.x, b.y, a.z), |
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point (a.x, a.y, b.z), |
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point (b.x, a.y, b.z), |
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point (a.x, b.y, b.z), |
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point (b.x, b.y, b.z), |
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}; |
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|
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if (!ib) |
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{ |
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static GLushort verts[4*6] = { |
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0, 4, 6, 2, // -x |
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1, 3, 7, 5, // +x |
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0, 1, 5, 4, // -y |
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7, 3, 2, 6, // +y |
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0, 2, 3, 1, // -z |
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4, 5, 7, 6, // +z |
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}; |
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|
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ib.set (verts, 4*6, GL_STATIC_DRAW_ARB); |
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} |
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|
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vb.set (vd, 8, GL_STREAM_DRAW_ARB); |
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vb.bind (); |
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ib.draw (GL_QUADS, 0, 4*6); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
| 293 |
|
| 294 |
GLsizei format_stride (GLenum format) |
| 295 |
{ |
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switch (format) |
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{ |
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case GL_V2F: abort (); |
| 299 |
case GL_V3F: return sizeof (vertex_v3f); |
| 300 |
case GL_C4UB_V2F: abort (); |
| 301 |
case GL_C4UB_V3F: abort (); |
| 302 |
case GL_C3F_V3F: abort (); |
| 303 |
case GL_N3F_V3F: abort (); |
| 304 |
case GL_C4F_N3F_V3F: abort (); |
| 305 |
case GL_T2F_V3F: abort (); |
| 306 |
case GL_T4F_V4F: abort (); |
| 307 |
case GL_T2F_C4UB_V3F: abort (); |
| 308 |
case GL_T2F_C3F_V3F: abort (); |
| 309 |
case GL_T2F_N3F_V3F: return sizeof (vertex_t2f_n3f_v3f); |
| 310 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 311 |
case GL_T4F_C4F_N3F_V4F: abort (); |
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default: |
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abort (); |
| 314 |
} |
| 315 |
} |
| 316 |
|
| 317 |
GLsizei format_offset_p (GLenum format) |
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{ |
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switch (format) |
| 320 |
{ |
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case GL_V2F: abort (); |
| 322 |
case GL_V3F: { vertex_v3f v; return (char *)&v.v - (char *)&v; } |
| 323 |
case GL_C4UB_V2F: abort (); |
| 324 |
case GL_C4UB_V3F: abort (); |
| 325 |
case GL_C3F_V3F: abort (); |
| 326 |
case GL_N3F_V3F: abort (); |
| 327 |
case GL_C4F_N3F_V3F: abort (); |
| 328 |
case GL_T2F_V3F: abort (); |
| 329 |
case GL_T4F_V4F: abort (); |
| 330 |
case GL_T2F_C4UB_V3F: abort (); |
| 331 |
case GL_T2F_C3F_V3F: abort (); |
| 332 |
case GL_T2F_N3F_V3F: { vertex_t2f_n3f_v3f v; return (char *)&v.v - (char *)&v; } |
| 333 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 334 |
case GL_T4F_C4F_N3F_V4F: abort (); |
| 335 |
default: |
| 336 |
abort (); |
| 337 |
} |
| 338 |
} |
| 339 |
|
| 340 |
GLsizei format_offset_n (GLenum format) |
| 341 |
{ |
| 342 |
switch (format) |
| 343 |
{ |
| 344 |
case GL_V2F: abort (); |
| 345 |
case GL_V3F: abort (); |
| 346 |
case GL_C4UB_V2F: abort (); |
| 347 |
case GL_C4UB_V3F: abort (); |
| 348 |
case GL_C3F_V3F: abort (); |
| 349 |
case GL_N3F_V3F: abort (); |
| 350 |
case GL_C4F_N3F_V3F: abort (); |
| 351 |
case GL_T2F_V3F: abort (); |
| 352 |
case GL_T4F_V4F: abort (); |
| 353 |
case GL_T2F_C4UB_V3F: abort (); |
| 354 |
case GL_T2F_C3F_V3F: abort (); |
| 355 |
case GL_T2F_N3F_V3F: { vertex_t2f_n3f_v3f v; return (char *)&v.n - (char *)&v; } |
| 356 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 357 |
case GL_T4F_C4F_N3F_V4F: abort (); |
| 358 |
default: |
| 359 |
abort (); |
| 360 |
} |
| 361 |
} |
| 362 |
|
| 363 |
GLsizei format_offset_t (GLenum format) |
| 364 |
{ |
| 365 |
switch (format) |
| 366 |
{ |
| 367 |
case GL_V2F: abort (); |
| 368 |
case GL_V3F: abort (); |
| 369 |
case GL_C4UB_V2F: abort (); |
| 370 |
case GL_C4UB_V3F: abort (); |
| 371 |
case GL_C3F_V3F: abort (); |
| 372 |
case GL_N3F_V3F: abort (); |
| 373 |
case GL_C4F_N3F_V3F: abort (); |
| 374 |
case GL_T2F_V3F: abort (); |
| 375 |
case GL_T4F_V4F: abort (); |
| 376 |
case GL_T2F_C4UB_V3F: abort (); |
| 377 |
case GL_T2F_C3F_V3F: abort (); |
| 378 |
case GL_T2F_N3F_V3F: { vertex_t2f_n3f_v3f v; return (char *)&v.t - (char *)&v; } |
| 379 |
case GL_T2F_C4F_N3F_V3F: abort (); |
| 380 |
case GL_T4F_C4F_N3F_V4F: abort (); |
| 381 |
default: |
| 382 |
abort (); |
| 383 |
} |
| 384 |
} |
| 385 |
|
| 386 |
///////////////////////////////////////////////////////////////////////////// |
| 387 |
|
| 388 |
int nesting; |
| 389 |
|
| 390 |
void errchk (const char *name, const char *args, const char *file, int line) |
| 391 |
{ |
| 392 |
static int inbegin; |
| 393 |
|
| 394 |
if (name[2] == 'B' && !strcmp (name, "glBegin")) |
| 395 |
inbegin = 1; |
| 396 |
else if (name[2] == 'E' && !strcmp (name, "glEnd")) |
| 397 |
inbegin = 0; |
| 398 |
|
| 399 |
if (inbegin) |
| 400 |
return; |
| 401 |
|
| 402 |
GLenum gl_derror = glGetError (); |
| 403 |
if (gl_derror != GL_NO_ERROR) |
| 404 |
{ |
| 405 |
fprintf (stderr, "%s:%d [GLERROR %d,%s] %s(%s)\n", |
| 406 |
file, line, gl_derror, gluErrorString (gl_derror), name, args); |
| 407 |
abort (); |
| 408 |
} |
| 409 |
} |
| 410 |
|
| 411 |
} |
| 412 |
|
| 413 |
//skedjuhlar main_scheduler; |
| 414 |
|
