Merge pull request #963 from yuriks/gpu-fixes

Misc. GPU vertex loading fixes

src/video_core/command_processor.cpp

@@ -221,20 +221,14 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
                 // Initialize data for the current vertex
                 VertexShader::InputVertex input;
 
-                // Load a debugging token to check whether this gets loaded by the running
-                // application or not.
-                static const float24 debug_token = float24::FromRawFloat24(0x00abcdef);
-                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, this data will be overwritten by the loader data if it's set
+                    if (vertex_attribute_elements[i] != 0) {
-                    if (attribute_config.IsDefaultAttribute(i)) {
+                        // Default attribute values set if array elements have < 4 components. This
-                        input.attr[i] = g_state.vs.default_attributes[i];
+                        // is *not* carried over from the default attribute settings even if they're
-                        LOG_TRACE(HW_GPU, "Loaded default attribute %x for vertex %x (index %x): (%f, %f, %f, %f)",
+                        // enabled for this attribute.
-                                  i, vertex, index,
+                        static const float24 zero = float24::FromFloat32(0.0f);
-                                  input.attr[i][0].ToFloat32(), input.attr[i][1].ToFloat32(),
+                        static const float24 one = float24::FromFloat32(1.0f);
-                                  input.attr[i][2].ToFloat32(), input.attr[i][3].ToFloat32());
+                        input.attr[i] = Math::Vec4<float24>(zero, zero, zero, one);
-                    }
 
                         // Load per-vertex data from the loader arrays
                         for (unsigned int comp = 0; comp < vertex_attribute_elements[i]; ++comp) {
@@ -260,17 +254,19 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
                                 vertex_attribute_strides[i] * vertex + comp * vertex_attribute_element_size[i],
                                 input.attr[i][comp].ToFloat32());
                         }
+                    } else if (attribute_config.IsDefaultAttribute(i)) {
+                        // Load the default attribute if we're configured to do so
+                        input.attr[i] = g_state.vs.default_attributes[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 {
+                        // TODO(yuriks): In this case, no data gets loaded and the vertex remains
+                        //              with the last value it had. This isn't currently maintained
+                        //              as global state, however, and so won't work in Cita yet.
+                    }
                 }
-
-                // 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
-                //       workaround, we force the fourth component to 1.0 if we find this to be the
-                //       case.
-                //       To do this, we additionally have to assume that the first input attribute
-                //       is the vertex position, since there's no information about this other than
-                //       the empiric observation that this is usually the case.
-                if (input.attr[0].w == debug_token)
-                    input.attr[0].w = float24::FromFloat32(1.0);
 
                 if (g_debug_context)
                     g_debug_context->OnEvent(DebugContext::Event::VertexLoaded, (void*)&input);

src/video_core/vertex_shader.cpp

@@ -609,6 +609,12 @@ OutputVertex RunShader(const InputVertex& input, int num_attributes, const Regs:
         }
     }
 
+    // The hardware takes the absolute and saturates vertex colors like this, *before* doing interpolation
+    for (int i = 0; i < 4; ++i) {
+        ret.color[i] = float24::FromFloat32(
+            std::fmin(std::fabs(ret.color[i].ToFloat32()), 1.0f));
+    }
+
     LOG_TRACE(Render_Software, "Output vertex: pos (%.2f, %.2f, %.2f, %.2f), col(%.2f, %.2f, %.2f, %.2f), tc0(%.2f, %.2f)",
         ret.pos.x.ToFloat32(), ret.pos.y.ToFloat32(), ret.pos.z.ToFloat32(), ret.pos.w.ToFloat32(),
         ret.color.x.ToFloat32(), ret.color.y.ToFloat32(), ret.color.z.ToFloat32(), ret.color.w.ToFloat32(),