Add support for important material buffer flags

This flag will most likely be crucial when porting particle materials as they use different buffers.

src/assets/material.cpp

@@ -343,6 +343,14 @@ void MaterialAsset_t::FromJSON(const rapidjson::Value& mapEntry)
     this->materialTypeStr = JSON_GetValueRequired<const char*>(mapEntry, "shaderType");
     this->materialType = Material_ShaderTypeFromString(this->materialTypeStr);
 
+    // this only seems to be in apex? heavily affects how the buffers are setup
+    // and which one is selected at Pak_LoadMaterialAsset(). Func sub_1403B4680
+    // also checks if this flag is '4' and materialType is 'PTCS'. The material
+    // "particle/smoke/smoke_charge02_close" (PTCU) for instance, has this set
+    // to 4, and 4 uses a different global buffer if this (flag & 253) != 0
+    if (this->assetVersion == 15)
+        this->uberBufferFlags = (uint8_t)JSON_GetNumberRequired<int>(mapEntry, "uberBufferFlags");
+
     // material max dimensions
     this->width = (short)JSON_GetNumberRequired<int>(mapEntry, "width"); // Set material width.
     this->height = (short)JSON_GetNumberRequired<int>(mapEntry, "height"); // Set material height.

src/public/material.h

@@ -506,7 +506,7 @@ struct __declspec(align(16)) MaterialAssetHeader_v15_t
 
 	uint16_t numAnimationFrames; // used in CMaterialGlue::GetNumAnimationFrames (0x1403B4250), which is called from GetSpriteInfo @ 0x1402561FC
 	MaterialShaderType_e materialType;
-	uint8_t bytef3; // used for unksections loading in UpdateMaterialAsset
+	uint8_t uberBufferFlags; // used for setting up buffers in Pak_UpdateMaterialAsset for the CMaterialGlue instance.
 
 	char pad_00F4[0x4];
 
@@ -553,8 +553,10 @@ struct MaterialAsset_t
 
 	MaterialDXState_v15_t dxStates[MAT_DX_STATE_COUNT]; // seems to be used for setting up some D3D states?
 
-	std::string materialTypeStr;
 	MaterialShaderType_e materialType;
+	uint8_t uberBufferFlags;
+
+	std::string materialTypeStr;
 
 	std::string name;
 	std::string surface;
@@ -641,6 +643,7 @@ struct MaterialAsset_t
 			matl->flags2 = this->flags2;
 
 			matl->materialType = this->materialType;
+			matl->uberBufferFlags = this->uberBufferFlags;
 
 			matl->textureAnimation = this->textureAnimation;
 			matl->numAnimationFrames = this->numAnimationFrames;