Merge pull request #34772 from clayjohn/ETC-support-alpha

Fallback to RGBA4444 for textures with alpha set to ETC compression

1 files changed, 7 insertions, 0 deletions

diff --git a/modules/etc/image_etc.cpp b/modules/etc/image_etc.cpp
index 7cd5e2eb12..f0b95c893d 100644
--- a/modules/etc/image_etc.cpp
+++ b/modules/etc/image_etc.cpp
@@ -139,6 +139,13 @@ static void _compress_etc(Image *p_img, float p_lossy_quality, bool force_etc1_f
 		return;
 	}
 
+	if (img_format >= Image::FORMAT_RGBA8 && force_etc1_format) {
+		// If VRAM compression is using ETC, but image has alpha, convert to RGBA4444
+		// This saves space while maintaining the alpha channel
+		p_img->convert(Image::FORMAT_RGBA4444);
+		return;
+	}
+
 	uint32_t imgw = p_img->get_width(), imgh = p_img->get_height();
 
 	Image::Format etc_format = force_etc1_format ? Image::FORMAT_ETC : _get_etc2_mode(detected_channels);