[Bf-blender-cvs] [d73130cc287] blender-v2.91-release: Fix T82770: Artifacts when painting on generated transparent image
Jeroen Bakker
noreply at git.blender.org
Tue Nov 17 16:11:12 CET 2020
Commit: d73130cc287690539a0509a44abd4c85ffb30188
Author: Jeroen Bakker
Date: Tue Nov 17 15:23:47 2020 +0100
Branches: blender-v2.91-release
https://developer.blender.org/rBd73130cc287690539a0509a44abd4c85ffb30188
Fix T82770: Artifacts when painting on generated transparent image
Regression introduced by {b17cca6966}. When centralizing the gpu texture
premultiplication setting it was assumed that generated images
(`IMA_TYPE_UV_TEST`) were stored as premultiplied. That assumption was
totally wrong as the alpha association is determined by the existing of
the float/byte buffer.
NOTE: This change will render generated images with pure emissive
colors (show colors when alpha=0.0) what might add more reports. Any
reports could be merged in the next report {T82790}.
Reviewed By: Clément Foucault, Philipp Oeser
Differential Revision: https://developer.blender.org/D9585
===================================================================
M source/blender/blenkernel/intern/image_gpu.c
===================================================================
diff --git a/source/blender/blenkernel/intern/image_gpu.c b/source/blender/blenkernel/intern/image_gpu.c
index 4d4013e5d1d..026edb0850b 100644
--- a/source/blender/blenkernel/intern/image_gpu.c
+++ b/source/blender/blenkernel/intern/image_gpu.c
@@ -52,16 +52,25 @@ static void image_free_gpu(Image *ima, const bool immediate);
/* Is the alpha of the `GPUTexture` for a given image/ibuf premultiplied. */
bool BKE_image_has_gpu_texture_premultiplied_alpha(Image *image, ImBuf *ibuf)
{
- const bool type_is_premultiplied = (image == NULL) || ELEM(image->type,
- IMA_TYPE_R_RESULT,
- IMA_TYPE_COMPOSITE,
- IMA_TYPE_UV_TEST);
- const bool store_premultiplied =
- type_is_premultiplied ||
- ((ibuf != NULL) &&
- (ibuf->rect_float ? (image ? (image->alpha_mode != IMA_ALPHA_STRAIGHT) : false) :
- (image ? (image->alpha_mode == IMA_ALPHA_PREMUL) : true)));
- return store_premultiplied;
+ if (image) {
+ /* Render result and compositor output are always premultiplied */
+ if (ELEM(image->type, IMA_TYPE_R_RESULT, IMA_TYPE_COMPOSITE)) {
+ return true;
+ }
+ /* Generated images use pre multiplied float buffer, but straight alpha for byte buffers. */
+ if (image->type == IMA_TYPE_UV_TEST && ibuf) {
+ return ibuf->rect_float != NULL;
+ }
+ }
+ else if (ibuf) {
+ if (ibuf->rect_float) {
+ return image ? (image->alpha_mode != IMA_ALPHA_STRAIGHT) : false;
+ }
+ else {
+ return image ? (image->alpha_mode == IMA_ALPHA_PREMUL) : true;
+ }
+ }
+ return false;
}
/* -------------------------------------------------------------------- */
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