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New BLI Function: projmat_from_window_region 

Creates a projection matrix for a small region of the viewport.

Reviewers: campbellbarton, brecht

Differential Revision: https://developer.blender.org/D5412
This commit is contained in:
Germano Cavalcante 2019-08-05 14:04:43 -03:00
parent 0c4ee9e13d
commit ad417f73c0
2 changed files with 51 additions and 0 deletions
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8
source/blender/blenlib/BLI_math_geom.h
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@ -635,6 +635,14 @@ void projmat_dimensions(const float projmat[4][4],
float *r_near,
float *r_far);
void projmat_from_subregion(const float projmat[4][4],
const int win_size[2],
const int x_min,
const int x_max,
const int y_min,
const int y_max,
float r_projmat[4][4]);
int box_clip_bounds_m4(float boundbox[2][3], const float bounds[4], float winmat[4][4]);
void box_minmax_bounds_m4(float min[3], float max[3], float boundbox[2][3], float mat[4][4]);

43
source/blender/blenlib/intern/math_geom.c
View File

@ -4481,6 +4481,49 @@ void projmat_dimensions(const float projmat[4][4],
}
}
/* Creates a projection matrix for a small region of the viewport.
*
* \param projmat: Projection Matrix.
* \param win_size: Viewport Size.
* \param x_min, x_max, y_min, y_max: Coordinates of the subregion.
* \return r_projmat: Resulting Projection Matrix.
*/
void projmat_from_subregion(const float projmat[4][4],
const int win_size[2],
const int x_min,
const int x_max,
const int y_min,
const int y_max,
float r_projmat[4][4])
{
float rect_width = (float)(x_max - x_min);
float rect_height = (float)(y_max - y_min);
float x_fac = ((x_min + x_max) - win_size[0]) / rect_width;
float y_fac = ((y_min + y_max) - win_size[1]) / rect_height;
copy_m4_m4(r_projmat, projmat);
r_projmat[0][0] *= (win_size[0] / rect_width);
r_projmat[1][1] *= (win_size[1] / rect_height);
#if 0 /* TODO: check if this is more efficient. */
r_projmat[2][0] -= x_fac * r_projmat[2][3];
r_projmat[2][1] -= y_fac * r_projmat[2][3];
r_projmat[3][0] -= x_fac * r_projmat[3][3];
r_projmat[3][1] -= y_fac * r_projmat[3][3];
#else
if (projmat[3][3] == 0.0f) {
r_projmat[2][0] += x_fac;
r_projmat[2][1] += y_fac;
}
else {
r_projmat[3][0] -= x_fac;
r_projmat[3][1] -= y_fac;
}
#endif
}
static void i_multmatrix(float icand[4][4], float Vm[4][4])
{
int row, col;