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Add support for Lum-alpha textures to ETC fallback

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clayjohn 2020-01-03 11:10:44 -08:00
parent 7a9fc69a16
commit cd21200944
1 changed files with 9 additions and 4 deletions
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9
modules/etc/image_etc.cpp
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@ -139,11 +139,16 @@ 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
if (force_etc1_format) {
// If VRAM compression is using ETC, but image has alpha, convert to RGBA4444 or LA8
// This saves space while maintaining the alpha channel
if (detected_channels == Image::DETECTED_RGBA) {
p_img->convert(Image::FORMAT_RGBA4444);
return;
} else if (detected_channels == Image::DETECTED_LA) {
p_img->convert(Image::FORMAT_LA8);
return;
}
}
uint32_t imgw = p_img->get_width(), imgh = p_img->get_height();