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Add function to multiply 4x4 matrix by 4D vector

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Abdelrahman Said 2024-07-07 23:18:00 +01:00
parent 7823e92861
commit 44c7b6ac1b
2 changed files with 14 additions and 0 deletions
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1
include/vector/vec.h
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@ -128,6 +128,7 @@ mat4x4f_t get_scaling_matrix(vec3f_t scale);
mat3x3f_t get_rotation_mat3x3f(vec3f_t rotation);
vec3f_t mul_mat3x4f_by_vec4f(mat3x4f_t mat, vec4f_t vec);
mat3x4f_t mul_mat3x4f_by_mat4x4f(mat3x4f_t mat1, mat4x4f_t mat2);
vec4f_t mul_mat4x4f_by_vec4f(mat4x4f_t mat, vec4f_t vec);
mat4x4f_t mul_mat4x4f(mat4x4f_t mat1, mat4x4f_t mat2);
#endif // !VEC_H

13
src/vector/vec.c
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@ -342,6 +342,19 @@ mat3x4f_t mul_mat3x4f_by_mat4x4f(mat3x4f_t mat1, mat4x4f_t mat2) {
};
}
vec4f_t mul_mat4x4f_by_vec4f(mat4x4f_t mat, vec4f_t vec) {
f32 x = mat.row0.x * vec.x + mat.row0.y * vec.y + mat.row0.z * vec.z +
mat.row0.w * vec.w;
f32 y = mat.row1.x * vec.x + mat.row1.y * vec.y + mat.row1.z * vec.z +
mat.row1.w * vec.w;
f32 z = mat.row2.x * vec.x + mat.row2.y * vec.y + mat.row2.z * vec.z +
mat.row2.w * vec.w;
f32 w = mat.row3.x * vec.x + mat.row3.y * vec.y + mat.row3.z * vec.z +
mat.row3.w * vec.w;
return (vec4f_t){x, y, z, w};
}
mat4x4f_t mul_mat4x4f(mat4x4f_t mat1, mat4x4f_t mat2) {
f32 row0_col0 = mat1.row0.x * mat2.row0.x + mat1.row0.y * mat2.row1.x +
mat1.row0.z * mat2.row2.x + mat1.row0.w * mat2.row3.x;