Pica/PrimitiveAssembly: Implement triangle strips.

src/video_core/primitive_assembly.cpp

@@ -30,20 +30,27 @@ void PrimitiveAssembler<VertexType>::SubmitVertex(VertexType& vtx, TriangleHandl
             }
             break;
 
+        case Regs::TriangleTopology::Strip:
         case Regs::TriangleTopology::Fan:
-            if (buffer_index == 2) {
-                buffer_index = 0;
-
-                triangle_handler(buffer[0], buffer[1], vtx);
+            if (strip_ready) {
+                // TODO: Should be "buffer[0], buffer[1], vtx" instead!
+                // Not quite sure why we need this order for things to show up properly.
+                // Maybe a bug in the rasterizer?
+                triangle_handler(buffer[1], buffer[0], vtx);
+            }
+            buffer[buffer_index] = vtx;
 
-                buffer[1] = vtx;
-            } else {
-                buffer[buffer_index++] = vtx;
+            if (topology == Regs::TriangleTopology::Strip) {
+                strip_ready |= (buffer_index == 1);
+                buffer_index = !buffer_index;
+            } else if (topology == Regs::TriangleTopology::Fan) {
+                buffer_index = 1;
+                strip_ready = true;
             }
             break;
 
         default:
-            LOG_ERROR(Render_Software, "Unknown triangle topology %x:", (int)topology);
+            LOG_ERROR(HW_GPU, "Unknown triangle topology %x:", (int)topology);
             break;
     }
 }

src/video_core/primitive_assembly.h

@@ -37,6 +37,7 @@ private:
 
     int buffer_index;
     VertexType buffer[2];
+    bool strip_ready = false;
 };