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Add matrix_scale/matrix_translate/matrix_projection - file will be

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reused for libretro 3D projects so leave this in
This commit is contained in:
twinaphex 2013-05-09 14:04:44 +02:00
parent 9f16c5eee5
commit 435a7dc467
2 changed files with 47 additions and 1 deletions
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44
gfx/math/matrix.c
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@ -92,6 +92,49 @@ void matrix_ortho(math_matrix *mat,
MAT_ELEM(*mat, 2, 3) = tz;
}
void matrix_scale(math_matrix *out, float x, float y,
float z)
{
math_matrix mat;
MAT_ELEM(mat, 0, 0) = x;
MAT_ELEM(mat, 1, 1) = y;
MAT_ELEM(mat, 2, 2) = z;
MAT_ELEM(mat, 3, 3) = 1.0;
*out = mat;
}
void matrix_translate(math_matrix *out, float x,
float y, float z)
{
math_matrix mat;
MAT_ELEM(mat, 0, 0) = 1.0;
MAT_ELEM(mat, 1, 1) = 1.0;
MAT_ELEM(mat, 2, 2) = 1.0;
MAT_ELEM(mat, 3, 3) = 1.0;
MAT_ELEM(mat, 0, 3) = x;
MAT_ELEM(mat, 1, 3) = y;
MAT_ELEM(mat, 2, 3) = z;
*out = mat;
}
void matrix_projection(math_matrix *out, float znear,
float zfar)
{
math_matrix mat;
MAT_ELEM(mat, 0, 0) = znear;
MAT_ELEM(mat, 1, 1) = zfar;
MAT_ELEM(mat, 2, 2) = (zfar + znear) / (zfar - znear);
MAT_ELEM(mat, 2, 3) = -2.0f * zfar * znear / (zfar - znear);
MAT_ELEM(mat, 3, 2) = -1.0f;
*out = mat;
}
void matrix_multiply(math_matrix *out,
const math_matrix *a, const math_matrix *b)
{
@ -110,4 +153,3 @@ void matrix_multiply(math_matrix *out,
*out = mat;
}

4
gfx/math/matrix.h
View File

@ -39,5 +39,9 @@ void matrix_ortho(math_matrix *mat,
void matrix_multiply(math_matrix *out, const math_matrix *a, const math_matrix *b);
void matrix_scale(math_matrix *out, float x, float y, float z);
void matrix_translate(math_matrix *out, float x, float y, float z);
void matrix_projection(math_matrix *out, float znear, float zfar);
#endif