GPU: Add Image property to allow high bitdepth support on a per image basis

This adds the `Half Float Precision` option in the image property panel.
This option is only available on float textures and is enabled by default.

Adding a flag inside the imbuf (IB_halffloat) on load is done for EXR and PSD formats that can store half floating point (16bits/channels).
The option is then not displayed in this case and forced.

Related task T73086

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D6891

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/editors/space_image/image_buttons.c b/source/blender/editors/space_image/image_buttons.c
index 270fe0c59dc..f4688ce17fd 100644
--- a/source/blender/editors/space_image/image_buttons.c
+++ b/source/blender/editors/space_image/image_buttons.c
@@ -980,6 +980,16 @@ void uiTemplateImage(uiLayout *layout,
           bool is_data = IMB_colormanagement_space_name_is_data(ima->colorspace_settings.name);
           uiLayoutSetActive(sub, !is_data);
         }
+
+        if (ima && iuser) {
+          void *lock;
+          ImBuf *ibuf = BKE_image_acquire_ibuf(ima, iuser, &lock);
+
+          if (ibuf->rect_float && (ibuf->flags & IB_halffloat) == 0) {
+            uiItemR(col, &imaptr, "use_half_precision", 0, NULL, ICON_NONE);
+          }
+          BKE_image_release_ibuf(ima, ibuf, lock);
+        }
       }
 
       uiItemR(col, &imaptr, "use_view_as_render", 0, NULL, ICON_NONE);