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1c2a0524b7
4x4 matrices aren't as optimal, but are much more sensible to handle when you want to do more advanced stuff like scaling, skewing, or inversion.
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/******************************************************************************
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Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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#include "vec4.h"
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#include "vec3.h"
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#include "matrix4.h"
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void vec4_from_vec3(struct vec4 *dst, const struct vec3 *v)
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{
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dst->m = v->m;
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dst->w = 1.0f;
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}
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void vec4_transform(struct vec4 *dst, const struct vec4 *v,
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const struct matrix4 *m)
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{
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struct vec4 temp;
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struct matrix4 transpose;
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matrix4_transpose(&transpose, m);
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temp.x = vec4_dot(&transpose.x, v);
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temp.y = vec4_dot(&transpose.y, v);
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temp.z = vec4_dot(&transpose.z, v);
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temp.w = vec4_dot(&transpose.t, v);
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vec4_copy(dst, &temp);
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}
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