mirror of
https://github.com/libretro/RetroArch.git
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114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "matrix.h"
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#include <string.h>
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#include <math.h>
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void matrix_identity(math_matrix *mat)
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{
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memset(mat, 0, sizeof(*mat));
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for (unsigned i = 0; i < 4; i++)
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MAT_ELEM(*mat, i, i) = 1.0f;
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}
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void matrix_transpose(math_matrix *out, const math_matrix *in)
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{
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math_matrix mat;
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for (unsigned i = 0; i < 4; i++)
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for (unsigned j = 0; j < 4; j++)
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MAT_ELEM(mat, j, i) = MAT_ELEM(*in, i, j);
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*out = mat;
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}
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void matrix_rotate_x(math_matrix *mat, float rad)
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{
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float cosine = cosf(rad);
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float sine = sinf(rad);
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matrix_identity(mat);
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MAT_ELEM(*mat, 1, 1) = cosine;
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MAT_ELEM(*mat, 2, 2) = cosine;
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MAT_ELEM(*mat, 1, 2) = -sine;
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MAT_ELEM(*mat, 2, 1) = sine;
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}
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void matrix_rotate_y(math_matrix *mat, float rad)
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{
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float cosine = cosf(rad);
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float sine = sinf(rad);
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matrix_identity(mat);
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MAT_ELEM(*mat, 0, 0) = cosine;
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MAT_ELEM(*mat, 2, 2) = cosine;
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MAT_ELEM(*mat, 0, 2) = -sine;
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MAT_ELEM(*mat, 2, 0) = sine;
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}
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void matrix_rotate_z(math_matrix *mat, float rad)
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{
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float cosine = cosf(rad);
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float sine = sinf(rad);
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matrix_identity(mat);
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MAT_ELEM(*mat, 0, 0) = cosine;
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MAT_ELEM(*mat, 1, 1) = cosine;
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MAT_ELEM(*mat, 0, 1) = -sine;
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MAT_ELEM(*mat, 1, 0) = sine;
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}
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void matrix_ortho(math_matrix *mat,
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float left, float right,
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float bottom, float top,
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float znear, float zfar)
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{
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matrix_identity(mat);
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float tx = -(right + left) / (right - left);
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float ty = -(top + bottom) / (top - bottom);
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float tz = -(zfar + znear) / (zfar - znear);
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MAT_ELEM(*mat, 0, 0) = 2.0f / (right - left);
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MAT_ELEM(*mat, 1, 1) = 2.0f / (top - bottom);
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MAT_ELEM(*mat, 2, 2) = -2.0f / (zfar - znear);
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MAT_ELEM(*mat, 0, 3) = tx;
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MAT_ELEM(*mat, 1, 3) = ty;
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MAT_ELEM(*mat, 2, 3) = tz;
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}
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void matrix_multiply(math_matrix *out,
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const math_matrix *a, const math_matrix *b)
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{
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math_matrix mat;
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for (unsigned r = 0; r < 4; r++)
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{
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for (unsigned c = 0; c < 4; c++)
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{
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float dot = 0.0f;
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for (unsigned k = 0; k < 4; k++)
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dot += MAT_ELEM(*a, r, k) * MAT_ELEM(*b, k, c);
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MAT_ELEM(mat, r, c) = dot;
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}
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}
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*out = mat;
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}
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