Fix T64625: Eevee image textures with alpha have dark edges

Now texture storage of images is defined by the alpha mode of the image. The
downside of this is that there can be artifacts near alpha edges where pixels
with zero alpha bleed in. It also adds more code complexity since image textures
are no longer all stored the same way.

This changes allows us to keep using sRGB texture formats, which have edge
darkening when stored with premultiplied alpha. Game engines seems to generally
do the same thing, and we want to be compatible with them.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_image_api.c b/source/blender/makesrna/intern/rna_image_api.c
index a26b4c6b6e4..933dae70457 100644
--- a/source/blender/makesrna/intern/rna_image_api.c
+++ b/source/blender/makesrna/intern/rna_image_api.c
@@ -342,7 +342,7 @@ void RNA_api_image(StructRNA *srna)
       func,
       "Load the image into an OpenGL texture. On success, image.bindcode will contain the "
       "OpenGL texture bindcode. Colors read from the texture will be in scene linear color space "
-      "and have premultiplied alpha.");
+      "and have premultiplied or straight alpha matching the image alpha mode");
   RNA_def_function_flag(func, FUNC_USE_REPORTS);
   RNA_def_int(
       func, "frame", 0, 0, INT_MAX, "Frame", "Frame of image sequence or movie", 0, INT_MAX);