187 lines
4.2 KiB
C
187 lines
4.2 KiB
C
/*
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* Copyright (c), Recep Aslantas.
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*
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* MIT License (MIT), http://opensource.org/licenses/MIT
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* Full license can be found in the LICENSE file
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*/
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/*
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Macros:
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GLM_MAT4X2_ZERO_INIT
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GLM_MAT4X2_ZERO
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Functions:
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CGLM_INLINE void glm_mat4x2_copy(mat4x2 mat, mat4x2 dest);
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CGLM_INLINE void glm_mat4x2_zero(mat4x2 mat);
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CGLM_INLINE void glm_mat4x2_make(float * __restrict src, mat4x2 dest);
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CGLM_INLINE void glm_mat4x2_mul(mat4x2 m1, mat2x4 m2, mat4 dest);
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CGLM_INLINE void glm_mat4x2_mulv(mat4x2 m, vec2 v, vec4 dest);
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CGLM_INLINE void glm_mat4x2_transpose(mat4x2 m, mat2x4 dest);
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CGLM_INLINE void glm_mat4x2_scale(mat4x2 m, float s);
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*/
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#ifndef cglm_mat4x2_h
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#define cglm_mat4x2_h
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#include "common.h"
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#define GLM_MAT4X2_ZERO_INIT {{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}}
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/* for C only */
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#define GLM_MAT4X2_ZERO GLM_MAT4X2_ZERO_INIT
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/*!
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* @brief copy all members of [mat] to [dest]
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*
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* @param[in] mat source
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* @param[out] dest destination
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*/
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CGLM_INLINE
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void
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glm_mat4x2_copy(mat4x2 mat, mat4x2 dest) {
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dest[0][0] = mat[0][0];
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dest[0][1] = mat[0][1];
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dest[1][0] = mat[1][0];
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dest[1][1] = mat[1][1];
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dest[2][0] = mat[2][0];
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dest[2][1] = mat[2][1];
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dest[3][0] = mat[3][0];
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dest[3][1] = mat[3][1];
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}
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/*!
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* @brief make given matrix zero.
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*
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* @param[in, out] mat matrix
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*/
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CGLM_INLINE
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void
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glm_mat4x2_zero(mat4x2 mat) {
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CGLM_ALIGN_MAT mat4x2 t = GLM_MAT4X2_ZERO_INIT;
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glm_mat4x2_copy(t, mat);
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}
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/*!
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* @brief Create mat4x2 matrix from pointer
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*
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* @param[in] src pointer to an array of floats
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* @param[out] dest matrix
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*/
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CGLM_INLINE
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void
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glm_mat4x2_make(float * __restrict src, mat4x2 dest) {
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dest[0][0] = src[0];
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dest[0][1] = src[1];
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dest[1][0] = src[2];
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dest[1][1] = src[3];
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dest[2][0] = src[4];
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dest[2][1] = src[5];
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dest[3][0] = src[6];
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dest[3][1] = src[7];
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}
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/*!
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* @brief multiply m1 and m2 to dest
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*
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* m1, m2 and dest matrices can be same matrix, it is possible to write this:
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*
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* @code
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* glm_mat4x2_mul(m, m, m);
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* @endcode
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*
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* @param[in] m1 left matrix
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* @param[in] m2 right matrix
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* @param[out] dest destination matrix
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*/
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CGLM_INLINE
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void
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glm_mat4x2_mul(mat4x2 m1, mat2x4 m2, mat4 dest) {
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float a00 = m1[0][0], a01 = m1[0][1],
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a10 = m1[1][0], a11 = m1[1][1],
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a20 = m1[2][0], a21 = m1[2][1],
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a30 = m1[3][0], a31 = m1[3][1],
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b00 = m2[0][0], b01 = m2[0][1], b02 = m2[0][2], b03 = m2[0][3],
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b10 = m2[1][0], b11 = m2[1][1], b12 = m2[1][2], b13 = m2[1][3];
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dest[0][0] = a00 * b00 + a01 * b10;
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dest[0][1] = a00 * b01 + a01 * b11;
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dest[0][2] = a00 * b02 + a01 * b12;
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dest[0][3] = a00 * b03 + a01 * b13;
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dest[1][0] = a10 * b00 + a11 * b10;
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dest[1][1] = a10 * b01 + a11 * b11;
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dest[1][2] = a10 * b02 + a11 * b12;
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dest[1][3] = a10 * b03 + a11 * b13;
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dest[2][0] = a20 * b00 + a21 * b10;
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dest[2][1] = a20 * b01 + a21 * b11;
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dest[2][2] = a20 * b02 + a21 * b12;
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dest[2][3] = a20 * b03 + a21 * b13;
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dest[3][0] = a30 * b00 + a31 * b10;
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dest[3][1] = a30 * b01 + a31 * b11;
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dest[3][2] = a30 * b02 + a31 * b12;
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dest[3][3] = a30 * b03 + a31 * b13;
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}
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/*!
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* @brief multiply matrix with column vector and store in dest vector
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*
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* @param[in] m matrix (left)
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* @param[in] v vector (right, column vector)
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* @param[out] dest result vector
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*/
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CGLM_INLINE
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void
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glm_mat4x2_mulv(mat4x2 m, vec2 v, vec4 dest) {
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float v0 = v[0], v1 = v[1];
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dest[0] = m[0][0] * v0 + m[0][1] * v1;
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dest[1] = m[1][0] * v0 + m[1][1] * v1;
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dest[2] = m[2][0] * v0 + m[2][1] * v1;
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dest[3] = m[3][0] * v0 + m[3][1] * v1;
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}
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/*!
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* @brief transpose matrix and store in dest
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*
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* @param[in] m matrix
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* @param[out] dest result
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*/
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CGLM_INLINE
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void
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glm_mat4x2_transpose(mat4x2 m, mat2x4 dest) {
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dest[0][0] = m[0][0];
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dest[0][1] = m[1][0];
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dest[0][2] = m[2][0];
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dest[0][3] = m[3][0];
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dest[1][0] = m[0][1];
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dest[1][1] = m[1][1];
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dest[1][2] = m[2][1];
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dest[1][3] = m[3][1];
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}
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/*!
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* @brief scale (multiply with scalar) matrix
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*
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* multiply matrix with scalar
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*
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* @param[in, out] m matrix
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* @param[in] s scalar
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*/
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CGLM_INLINE
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void
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glm_mat4x2_scale(mat4x2 m, float s) {
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m[0][0] *= s; m[0][1] *= s; m[1][0] *= s; m[1][1] *= s;
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m[2][0] *= s; m[2][1] *= s; m[3][0] *= s; m[3][1] *= s;
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}
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#endif
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