GPU/DefaultAttributes: Let the attribute data from the loaders overwrite the default attributes, if set.

closes #735

src/video_core/command_processor.cpp

@@ -74,11 +74,11 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
             // Information about internal vertex attributes
             u32 vertex_attribute_sources[16];
             boost::fill(vertex_attribute_sources, 0xdeadbeef);
-            u32 vertex_attribute_strides[16];
-            Regs::VertexAttributeFormat vertex_attribute_formats[16];
+            u32 vertex_attribute_strides[16] = {};
+            Regs::VertexAttributeFormat vertex_attribute_formats[16] = {};
 
-            u32 vertex_attribute_elements[16];
-            u32 vertex_attribute_element_size[16];
+            u32 vertex_attribute_elements[16] = {};
+            u32 vertex_attribute_element_size[16] = {};
 
             // Setup attribute data from loaders
             for (int loader = 0; loader < 12; ++loader) {
@@ -127,13 +127,16 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
                 input.attr[0].w = debug_token;
 
                 for (int i = 0; i < attribute_config.GetNumTotalAttributes(); ++i) {
+                    // Load the default attribute if we're configured to do so
                     if (attribute_config.IsDefaultAttribute(i)) {
                         input.attr[i] = VertexShader::GetDefaultAttribute(i);
                         LOG_TRACE(HW_GPU, "Loaded default attribute %x for vertex %x (index %x): (%f, %f, %f, %f)",
                                   i, vertex, index,
                                   input.attr[i][0].ToFloat32(), input.attr[i][1].ToFloat32(),
                                   input.attr[i][2].ToFloat32(), input.attr[i][3].ToFloat32());
-                    } else {
+                    }
+                    
+                    // Overwrite the default data with the loader data if there's any
                     for (unsigned int comp = 0; comp < vertex_attribute_elements[i]; ++comp) {
                         const u8* srcdata = Memory::GetPhysicalPointer(vertex_attribute_sources[i] + vertex_attribute_strides[i] * vertex + comp * vertex_attribute_element_size[i]);
 
@@ -151,7 +154,6 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
                             input.attr[i][comp].ToFloat32());
                     }
                 }
-                }
 
                 // HACK: Some games do not initialize the vertex position's w component. This leads
                 //       to critical issues since it messes up perspective division. As a