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/* |
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* math support |
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* most of the more complicated code is taken from mesa. |
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*/ |
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|
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#include <cstdio> // ugly |
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#include <cmath> |
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|
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#include <sys/time.h> |
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#include <time.h> |
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|
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#include <GL/gl.h> |
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#include <GL/glut.h> |
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|
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#include "util.h" |
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#include "entity.h" |
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|
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#define DEG2RAD (M_PI / 180.) |
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|
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void renormalize (sector &s, point &p) |
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{ |
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float i; |
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|
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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; |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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const vec3 normalize (const vec3 &v) |
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{ |
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GLfloat s = abs (v); |
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|
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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); |
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} |
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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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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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const 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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const 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 = abs (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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const 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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const 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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///////////////////////////////////////////////////////////////////////////// |
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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. / abs (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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|
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void timer::frame () |
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{ |
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struct timeval tv; |
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gettimeofday (&tv, 0); |
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|
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double next = tv.tv_sec - base + tv.tv_usec / 1.e6; |
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|
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diff = next - now; |
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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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GLuint SDL_GL_LoadTexture (SDL_Surface * surface, GLfloat * texcoord) |
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{ |
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GLuint texture; |
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int w, h; |
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SDL_Surface *image; |
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SDL_Rect area; |
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Uint32 saved_flags; |
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Uint8 saved_alpha; |
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|
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/* Use the surface width and height expanded to powers of 2 */ |
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//w = power_of_two (surface->w); |
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//h = power_of_two (surface->h); |
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w = power_of_two (surface->w); |
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h = power_of_two (surface->h); |
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texcoord[0] = 0.0f; /* Min X */ |
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texcoord[1] = 0.0f; /* Min Y */ |
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texcoord[2] = (GLfloat) surface->w / w; /* Max X */ |
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texcoord[3] = (GLfloat) surface->h / h; /* Max Y */ |
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|
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image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32, |
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#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ |
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0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 |
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#else |
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0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF |
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#endif |
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); |
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if (image == NULL) |
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{ |
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return 0; |
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} |
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|
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/* Save the alpha blending attributes */ |
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saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK); |
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saved_alpha = surface->format->alpha; |
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if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA) |
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{ |
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SDL_SetAlpha (surface, 0, 0); |
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} |
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|
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/* Copy the surface into the GL texture image */ |
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area.x = 0; |
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area.y = 0; |
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area.w = surface->w; |
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area.h = surface->h; |
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SDL_BlitSurface (surface, &area, image, &area); |
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|
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/* Restore the alpha blending attributes */ |
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if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA) |
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{ |
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SDL_SetAlpha (surface, saved_flags, saved_alpha); |
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} |
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|
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/* Create an OpenGL texture for the image */ |
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glGenTextures (1, &texture); |
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glBindTexture (GL_TEXTURE_2D, texture); |
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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glTexImage2D (GL_TEXTURE_2D, |
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0, |
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GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels); |
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SDL_FreeSurface (image); /* No longer needed */ |
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|
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return texture; |
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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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while (!*str) |
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glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, *str++); |
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} |
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|
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namespace gl { |
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|
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void draw_box (const view &ctx, const sector &a, const sector &b) |
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{ |
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int i; |
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static GLint verts[] = { |
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0x8000, 0x8004, 0x8006, 0x8002, // -x |
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0x8001, 0x8003, 0x8007, 0x8005, // +x |
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0x8000, 0x8001, 0x8005, 0x8004, // -y |
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0x8007, 0x8003, 0x8002, 0x8006, // +y |
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0x8000, 0x8002, 0x8003, 0x8001, // -z |
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0x8004, 0x8005, 0x8007, 0x8006, // +z |
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0 |
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}; |
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|
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glBegin (GL_QUADS); |
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|
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for (GLint *v = verts; *v; v++) |
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{ |
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GLint mask = *v; |
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|
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glVertex3i (mask & 1 ? b.x : a.x, |
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mask & 2 ? b.y : a.y, |
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mask & 4 ? b.z : a.z); |
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} |
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|
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glEnd (); |
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} |
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|
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} |
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|
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//skedjuhlar main_scheduler; |
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|
