GPU_matrix: Add GPU_matrix_unproject_precalc

Pre-calculates values needed for unprojecting to avoid
a matrix invert and extracting projection matrix dimensions for
every call to GPU_matrix_unproject.

Use for gizmo selection drawing.

1 files changed, 6 insertions, 3 deletions

diff --git a/source/blender/windowmanager/gizmo/intern/wm_gizmo_map.c b/source/blender/windowmanager/gizmo/intern/wm_gizmo_map.c
index 6915ea91c8e..f57760cdc2b 100644
--- a/source/blender/windowmanager/gizmo/intern/wm_gizmo_map.c
+++ b/source/blender/windowmanager/gizmo/intern/wm_gizmo_map.c
@@ -571,8 +571,11 @@ static int gizmo_find_intersected_3d_intern(wmGizmo **visible_gizmos,
     const int viewport[4] = {0, 0, ar->winx, ar->winy};
     float co_3d_origin[3];
 
-    GPU_matrix_unproject_model_inverted(
-        co_screen, rv3d->viewinv, rv3d->winmat, viewport, co_3d_origin);
+    /* Avoid multiple calculations. */
+    struct GPUMatrixUnproject_Precalc unproj_precalc;
+    GPU_matrix_unproject_precalc(&unproj_precalc, rv3d->viewmat, rv3d->winmat, viewport);
+
+    GPU_matrix_unproject_with_precalc(&unproj_precalc, co_screen, co_3d_origin);
 
     GLuint *buf_iter = buffer;
     int hit_found = -1;
@@ -583,7 +586,7 @@ static int gizmo_find_intersected_3d_intern(wmGizmo **visible_gizmos,
       wmGizmo *gz = visible_gizmos[buf_iter[3] >> 8];
       float co_3d[3];
       co_screen[2] = int_as_float(buf_iter[1]);
-      GPU_matrix_unproject_model_inverted(co_screen, rv3d->viewinv, rv3d->winmat, viewport, co_3d);
+      GPU_matrix_unproject_with_precalc(&unproj_precalc, co_screen, co_3d);
       float select_bias = gz->select_bias;
       if ((gz->flag & WM_GIZMO_DRAW_NO_SCALE) == 0) {
         select_bias *= gz->scale_final;