[Fix] (MG_Util/Texture, MG_Util/Converters): canonical packed transfer types for RGBA4/RGB565/RGB10_A2UI - NormalizePixelFormat's default handed backends GL_UNSIGNED_BYTE (and a non-integer GL_RGB transfer format for RGB10_A2UI), so uploads read 4 bytes per texel from 2-byte packed shadow rows (rgba4 layers shifted by 2x slice stride) or were rejected outright; also map GL_RGB565 <-> TextureInternalFormat::RGB5 (the enum had no GL_RGB565 mapping at all, glTexImage* with it failed as unknown)

MobileGL/MG_Util/Converters/GLToMG/TextureEnumConverter.cpp

@@ -131,6 +131,9 @@ namespace MobileGL {
             case GL_RGB4:
                 return TextureInternalFormat::RGB4;
             case GL_RGB5:
+            // GL_RGB565 (GL 4.1 / ARB_ES2_compatibility, used directly by the GL CTS) is the
+            // ES-facing rendition of the legacy RGB5 resolution.
+            case GL_RGB565:
                 return TextureInternalFormat::RGB5;
             case GL_RGB8:
                 return TextureInternalFormat::RGB8;

MobileGL/MG_Util/Converters/MGToGL/TextureEnumConverter.cpp

@@ -113,7 +113,10 @@ namespace MobileGL {
             case TextureInternalFormat::RGB4:
                 return GL_RGB4;
             case TextureInternalFormat::RGB5:
-                return GL_RGB5;
+                // Emit the ES-compatible GL_RGB565 rendition: desktop GL_RGB5 is not a legal
+                // sized internalformat on OpenGL ES backends, GL_RGB565 is (and GL 4.1+
+                // accepts it too via ARB_ES2_compatibility).
+                return GL_RGB565;
             case TextureInternalFormat::RGB8:
                 return GL_RGB8;
             case TextureInternalFormat::RGB8Snorm:

MobileGL/MG_Util/Texture/TextureFormatProcessor.cpp

@@ -282,12 +282,17 @@ namespace MobileGL::MG_Util::TextureFormatProcessor {
             // Color sized other
             case GL_RGB9_E5:
             case GL_R11F_G11F_B10F:
+            case GL_RGB565:
                 *outFormat = GL_RGB;
                 break;
             case GL_RGB10_A2:
             case GL_RGB5_A1:
+            case GL_RGBA4:
                 *outFormat = GL_RGBA;
                 break;
+            case GL_RGB10_A2UI:
+                *outFormat = GL_RGBA_INTEGER;
+                break;
 
             // Depth
             case GL_DEPTH_COMPONENT16:
@@ -459,11 +464,23 @@ namespace MobileGL::MG_Util::TextureFormatProcessor {
                 *outType = GL_UNSIGNED_INT_10F_11F_11F_REV;
                 break;
             case GL_RGB10_A2:
+            case GL_RGB10_A2UI:
                 *outType = GL_UNSIGNED_INT_2_10_10_10_REV;
                 break;
             case GL_RGB5_A1:
                 *outType = GL_UNSIGNED_SHORT_5_5_5_1;
                 break;
+            // The shadow mip keeps these formats' packed client bytes (legacy copy path),
+            // so the canonical transfer type must stay the packed word — the previous
+            // default (GL_UNSIGNED_BYTE) made the backend read 4 bytes per texel from a
+            // 2-byte-per-texel shadow (KHR-GL33.pixelstoragemodes teximage rgba4/rgb565
+            // sliced/garbled uploads).
+            case GL_RGBA4:
+                *outType = GL_UNSIGNED_SHORT_4_4_4_4;
+                break;
+            case GL_RGB565:
+                *outType = GL_UNSIGNED_SHORT_5_6_5;
+                break;
 
                 // Depth
             case GL_DEPTH_COMPONENT16: