[Fix] (MG_Backend/DirectVulkan): support Voxy rendering

Implemented:

- Advertise Voxy-required DirectVulkan extensions without raising the reported OpenGL version.

- Add DirectVulkan compute, indirect draw count, DSA, readback, and buffer state paths needed by Voxy.

Fixed:

- Enable Vulkan shaderInt64 and drawIndirectFirstInstance so Voxy baseInstance-driven LOD draws address the correct section data.

- Fix DirectVulkan synchronization, framebuffer, texture readback, and shader interface handling used by Voxy and Minecraft screenshots.

Tests:

- Add MG_Test coverage for DirectVulkan extension advertising, DSA buffer/texture/framebuffer/vertex-array behavior, persistent mapped readback, and shader/program paths.

MobileGL/MG_Util/Converters/MGToStr/BufferEnumConverter.cpp

@@ -38,6 +38,8 @@ namespace MobileGL {
                 return "DispatchIndirect";
             case BufferTarget::DrawIndirect:
                 return "DrawIndirect";
+            case BufferTarget::Parameter:
+                return "Parameter";
             case BufferTarget::ShaderStorage:
                 return "ShaderStorage";
             case BufferTarget::Unknown:
@@ -87,4 +89,4 @@ namespace MobileGL {
             return result.empty() ? "[]" : result;
         }
     } // namespace MG_Util
-} // namespace MobileGL
+} // namespace MobileGL

MobileGL/MG_Util/Converters/MGToStr/RenderStateEnumConverter.cpp

@@ -131,6 +131,17 @@ namespace MobileGL {
             }
         }
 
+        String ConvertProvokingVertexModeToString(ProvokingVertexMode v) {
+            switch (v) {
+            case ProvokingVertexMode::FirstVertex:
+                return "FirstVertex";
+            case ProvokingVertexMode::LastVertex:
+                return "LastVertex";
+            default:
+                return "Unknown";
+            }
+        }
+
         String ConvertCapabilityInputToString(CapabilityInput v) {
             switch (v) {
             case CapabilityInput::Blend:

MobileGL/MG_Util/Converters/MGToStr/RenderStateEnumConverter.h

@@ -17,6 +17,7 @@ namespace MobileGL {
         String ConvertPixelStoreParamToString(PixelStoreParam value);
         String ConvertCullFaceModeToString(CullFaceMode value);
         String ConvertFrontFaceModeToString(FrontFaceMode value);
+        String ConvertProvokingVertexModeToString(ProvokingVertexMode value);
         String ConvertCapabilityInputToString(CapabilityInput value);
     } // namespace MG_Util
 } // namespace MobileGL