Fix T65306: UI widgets clipped when scaled up

Normal UI widget and 3D navigation gizmo where clipping at high DPI.

1 files changed, 9 insertions, 6 deletions

diff --git a/source/blender/editors/interface/interface_draw.c b/source/blender/editors/interface/interface_draw.c
index 31cbd2a3831..0250900759f 100644
--- a/source/blender/editors/interface/interface_draw.c
+++ b/source/blender/editors/interface/interface_draw.c
@@ -1736,7 +1736,7 @@ void ui_draw_but_UNITVEC(uiBut *but, const uiWidgetColors *wcol, const rcti *rec
   /* sphere color */
   float diffuse[3] = {1.0f, 1.0f, 1.0f};
   float light[3];
-  float size;
+  const float size = 0.5f * min_ff(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect));
 
   /* backdrop */
   UI_draw_roundbox_corner_set(UI_CNR_ALL);
@@ -1752,11 +1752,10 @@ void ui_draw_but_UNITVEC(uiBut *but, const uiWidgetColors *wcol, const rcti *rec
   /* transform to button */
   GPU_matrix_push();
 
-  if (BLI_rcti_size_x(rect) < BLI_rcti_size_y(rect)) {
-    size = 0.5f * BLI_rcti_size_x(rect);
-  }
-  else {
-    size = 0.5f * BLI_rcti_size_y(rect);
+  bool use_project_matrix = (size >= -GPU_MATRIX_ORTHO_CLIP_NEAR_DEFAULT);
+  if (use_project_matrix) {
+    GPU_matrix_push_projection();
+    GPU_matrix_ortho_set_z(-size, size);
   }
 
   GPU_matrix_translate_2f(rect->xmin + 0.5f * BLI_rcti_size_x(rect),
@@ -1784,6 +1783,10 @@ void ui_draw_but_UNITVEC(uiBut *but, const uiWidgetColors *wcol, const rcti *rec
   GPU_blend(false);
   GPU_line_smooth(false);
 
+  if (use_project_matrix) {
+    GPU_matrix_pop_projection();
+  }
+
   /* matrix after circle */
   GPU_matrix_pop();