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#include "my_math.h"
#include <math.h>
v2 scale_v2(v2 v, f32 x)
{
return (v2){v.x * x, v.y * x};
}
v2 add_v2(v2 a, v2 b)
{
return (v2){a.x + b.x, a.y + b.y};
}
v2 v2a(f32 x)
{
return (v2){x, x};
}
v3 v3a(f32 x)
{
return (v3){x, x, x};
}
mat mul_mat(mat l, mat r)
{
f32 l00 = l.c0.x, l01 = l.c0.y, l02 = l.c0.z, l03 = l.c0.w;
f32 l10 = l.c1.x, l11 = l.c1.y, l12 = l.c1.z, l13 = l.c1.w;
f32 l20 = l.c2.x, l21 = l.c2.y, l22 = l.c2.z, l23 = l.c2.w;
f32 l30 = l.c3.x, l31 = l.c3.y, l32 = l.c3.z, l33 = l.c3.w;
f32 r00 = r.c0.x, r01 = r.c0.y, r02 = r.c0.z, r03 = r.c0.w;
f32 r10 = r.c1.x, r11 = r.c1.y, r12 = r.c1.z, r13 = r.c1.w;
f32 r20 = r.c2.x, r21 = r.c2.y, r22 = r.c2.z, r23 = r.c2.w;
f32 r30 = r.c3.x, r31 = r.c3.y, r32 = r.c3.z, r33 = r.c3.w;
mat result = {
{
l00*r00+l10*r01+l20*r02+l30*r03,
l01*r00+l11*r01+l21*r02+l31*r03,
l02*r00+l12*r01+l22*r02+l32*r03,
l03*r00+l13*r01+l23*r02+l33*r03
},
{
l00*r10+l10*r11+l20*r12+l30*r13,
l01*r10+l11*r11+l21*r12+l31*r13,
l02*r10+l12*r11+l22*r12+l32*r13,
l03*r10+l13*r11+l23*r12+l33*r13
},
{
l00*r20+l10*r21+l20*r22+l30*r23,
l01*r20+l11*r21+l21*r22+l31*r23,
l02*r20+l12*r21+l22*r22+l32*r23,
l03*r20+l13*r21+l23*r22+l33*r23
},
{
l00*r30+l10*r31+l20*r32+l30*r33,
l01*r30+l11*r31+l21*r32+l31*r33,
l02*r30+l12*r31+l22*r32+l32*r33,
l03*r30+l13*r31+l23*r32+l33*r33
}
};
return result;
}
mat make_scale_mat(v3 v)
{
mat m = {0};
m.c0.x = v.x;
m.c1.y = v.y;
m.c2.z = v.z;
m.c3.w = 1.0f;
return m;
}
mat make_rotate_mat(v3 x, v3 y, v3 z)
{
mat m = {
{x.x, x.y, x.z, 0.0f},
{y.x, y.y, y.z, 0.0f},
{z.x, z.y, z.z, 0.0f},
{0.0f, 0.0f, 0.0f, 1.0f}
};
return m;
}
mat make_translate_mat(v3 v)
{
mat m = mat_identity;
m.c3.x = v.x;
m.c3.y = v.y;
m.c3.z = v.z;
return m;
}
mat scale_mat(mat m, v3 v)
{
return mul_mat(make_scale_mat(v), m);
}
mat rotate_mat(mat m, v3 angles)
{
f32 angle = deg2rad(angles.x);
f32 cx = cosf(angle);
f32 sx = sinf(angle);
angle = deg2rad(angles.y);
f32 cy = cosf(angle);
f32 sy = sinf(angle);
angle = deg2rad(angles.z);
f32 cz = cosf(angle);
f32 sz = sinf(angle);
v3 x = {cy * cz, sx * sy * cz + cx * sz, -cx * sy * cz + sx * sz};
v3 y = {-cy * sz, -sx * sy * sz + cx * cz, cx * sy * sz + sx * cz};
v3 z = {sy, -sx * cy, cx * cy};
return mul_mat(make_rotate_mat(x, y, z), m);
}
mat translate_mat(mat m, v3 v)
{
return mul_mat(make_translate_mat(v), m);
}
mat ortho(f32 l, f32 r, f32 b, f32 t, f32 n, f32 f)
{
mat ortho = {0};
ortho.c0.x = 2.0f / (r - l);
ortho.c1.y = 2.0f / (t - b);
ortho.c2.z = -2.0f / (f - n);
ortho.c3.x = -((r + l) / (r - l));
ortho.c3.y = -((t + b) / (t - b));
ortho.c3.z = -((f + n) / (f - n));
ortho.c3.w = 1.0f;
return ortho;
}
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