maxwell_dma: multisized components support added (untested)

src/video_core/engines/maxwell_dma.cpp

@@ -92,19 +92,25 @@ void MaxwellDMA::Launch() {
             }
         }
     } else {
-        // TODO: allow multisized components.
+        // TODO: xbzk: multisized components support.
+        // validadte this widely!
+        // shipped in PR 3164.
         auto& accelerate = rasterizer->AccessAccelerateDMA();
         const bool is_const_a_dst = regs.remap_const.dst_x == RemapConst::Swizzle::CONST_A;
         if (regs.launch_dma.remap_enable != 0 && is_const_a_dst) {
-            ASSERT(regs.remap_const.component_size_minus_one == 3);
+            const u32 remap_components_size = regs.remap_const.component_size_minus_one + 1;
             accelerate.BufferClear(regs.offset_out, regs.line_length_in,
                                    regs.remap_const.remap_consta_value);
-            read_buffer.resize_destructive(regs.line_length_in * sizeof(u32));
-            std::span<u32> span(reinterpret_cast<u32*>(read_buffer.data()), regs.line_length_in);
-            std::ranges::fill(span, regs.remap_const.remap_consta_value);
+            read_buffer.resize_destructive(regs.line_length_in * remap_components_size);
+            for (u32 i = 0; i < regs.line_length_in; ++i) {
+                for (u32 j = 0; j < remap_components_size; ++j) {
+                    read_buffer[i * remap_components_size + j] =
+                        (regs.remap_const.remap_consta_value >> (j * 8)) & 0xFF;
+                }
+            }
             memory_manager.WriteBlockUnsafe(regs.offset_out,
-                                            reinterpret_cast<u8*>(read_buffer.data()),
-                                            regs.line_length_in * sizeof(u32));
+                                            read_buffer.data(),
+                                            regs.line_length_in * remap_components_size);
         } else {
             memory_manager.FlushCaching();
             const auto convert_linear_2_blocklinear_addr = [](u64 address) {