[Feat] (MG_State, MG_Util, MG_Impl/GLImpl, MG_Backend/DirectGLES): desktop-GL single-channel client formats GL_GREEN/GL_BLUE/GL_ALPHA and _INTEGER variants - validate and readback via wide-RGBA channel extraction (GL CTS packed_pixels rgba8_format_green/blue read with them), unpack GREEN/BLUE(_INTEGER) TexImage uploads into the named channel with 0/1 defaults per table 3.3; GL_ALPHA keeps the legacy Red upload mapping (R8 storage + 000R swizzle), its readback corrected at the backend to source channel 3

MobileGL/MG_Util/Converters/MGToStr/TextureEnumConverter.cpp

@@ -67,6 +67,18 @@ namespace MobileGL {
                 return "RGBAInteger";
             case TextureInputFormat::BGRAInteger:
                 return "BGRAInteger";
+            case TextureInputFormat::Green:
+                return "Green";
+            case TextureInputFormat::Blue:
+                return "Blue";
+            case TextureInputFormat::Alpha:
+                return "Alpha";
+            case TextureInputFormat::GreenInteger:
+                return "GreenInteger";
+            case TextureInputFormat::BlueInteger:
+                return "BlueInteger";
+            case TextureInputFormat::AlphaInteger:
+                return "AlphaInteger";
             case TextureInputFormat::StencilIndex:
                 return "StencilIndex";
             case TextureInputFormat::DepthComponent: