[Fix] (MG_Backend/DirectGLES): upload shadow mips with UNPACK_ALIGNMENT=1 - shadow rows are tightly packed but uploads ran with alignment 4, shifting every row of non-multiple-of-4-width textures by one pixel (R8 7-wide CTS gradients read back diagonally)

2026-09-08 04:08:32 +09:00 · 2026-07-16 05:52:01 -04:00
parent 274c234aff
commit 12a67f596c
1 changed files with 5 additions and 1 deletions
@@ -1405,7 +1405,11 @@ namespace MobileGL::MG_Backend::DirectGLES {
                m_prevSkipPixels = s_skipPixels;
                m_prevImageHeight = s_imageHeight;
                m_prevSkipImages = s_skipImages;
-                Apply(4, 0, 0, 0, 0, 0);
+                // Shadow mip data is tightly packed (ProcessTexturePixelsDataUnpack emits
+                // width * bpp rows with no padding), so uploads must use UNPACK_ALIGNMENT = 1.
+                // Alignment 4 made the driver read e.g. 7-byte R8 rows at an 8-byte stride,
+                // shifting every row of a non-multiple-of-4 upload by one pixel.
+                Apply(1, 0, 0, 0, 0, 0);
            }

            ~ScopedDefaultUnpackState() {