Fixes and Corrections to DMA Engine

src/video_core/engines/maxwell_dma.cpp

@@ -83,57 +83,66 @@ void MaxwellDMA::HandleCopy() {
 
     ASSERT(regs.exec.enable_2d == 1);
 
-    const std::size_t copy_size = regs.x_count * regs.y_count;
+    if (regs.exec.is_dst_linear && !regs.exec.is_src_linear) {
+        ASSERT(regs.src_params.size_z == 1);
+        // If the input is tiled and the output is linear, deswizzle the input and copy it over.
+        const u32 src_bytes_per_pixel = regs.src_pitch / regs.src_params.size_x;
+        const std::size_t src_size = Texture::CalculateSize(
+            true, src_bytes_per_pixel, regs.src_params.size_x, regs.src_params.size_y,
+            regs.src_params.size_z, regs.src_params.BlockHeight(), regs.src_params.BlockDepth());
 
-    auto source_ptr{memory_manager.GetPointer(source)};
-    auto dst_ptr{memory_manager.GetPointer(dest)};
+        const std::size_t dst_size = regs.dst_pitch * regs.y_count;
 
-    if (!source_ptr) {
-        LOG_ERROR(HW_GPU, "source_ptr is invalid");
-        return;
-    }
+        if (read_buffer.size() < src_size) {
+            read_buffer.resize(src_size);
+        }
 
-    if (!dst_ptr) {
-        LOG_ERROR(HW_GPU, "dst_ptr is invalid");
-        return;
-    }
+        if (write_buffer.size() < dst_size) {
+            write_buffer.resize(dst_size);
+        }
 
-    const auto FlushAndInvalidate = [&](u32 src_size, u64 dst_size) {
-        // TODO(Subv): For now, manually flush the regions until we implement GPU-accelerated
-        // copying.
-        rasterizer.FlushRegion(ToCacheAddr(source_ptr), src_size);
+        memory_manager.ReadBlock(source, read_buffer.data(), src_size);
+        memory_manager.ReadBlock(dest, write_buffer.data(), dst_size);
 
-        // We have to invalidate the destination region to evict any outdated surfaces from the
-        // cache. We do this before actually writing the new data because the destination address
-        // might contain a dirty surface that will have to be written back to memory.
-        rasterizer.InvalidateRegion(ToCacheAddr(dst_ptr), dst_size);
-    };
+        Texture::UnswizzleSubrect(regs.x_count, regs.y_count, regs.dst_pitch,
+                                  regs.src_params.size_x, src_bytes_per_pixel, read_buffer.data(),
+                                  write_buffer.data(), regs.src_params.BlockHeight(),
+                                  regs.src_params.pos_x, regs.src_params.pos_y);
 
-    if (regs.exec.is_dst_linear && !regs.exec.is_src_linear) {
-        ASSERT(regs.src_params.size_z == 1);
-        // If the input is tiled and the output is linear, deswizzle the input and copy it over.
+        memory_manager.WriteBlock(dest, write_buffer.data(), dst_size);
+    } else {
+        ASSERT(regs.dst_params.BlockDepth() == 1);
 
-        const u32 src_bytes_per_pixel = regs.src_pitch / regs.src_params.size_x;
+        const u32 src_bytes_per_pixel = regs.src_pitch / regs.x_count;
 
-        FlushAndInvalidate(regs.src_pitch * regs.src_params.size_y,
-                           copy_size * src_bytes_per_pixel);
+        const std::size_t dst_size = Texture::CalculateSize(
+            true, src_bytes_per_pixel, regs.dst_params.size_x, regs.dst_params.size_y,
+            regs.dst_params.size_z, regs.dst_params.BlockHeight(), regs.dst_params.BlockDepth());
 
-        Texture::UnswizzleSubrect(regs.x_count, regs.y_count, regs.dst_pitch,
-                                  regs.src_params.size_x, src_bytes_per_pixel, source_ptr, dst_ptr,
-                                  regs.src_params.BlockHeight(), regs.src_params.pos_x,
-                                  regs.src_params.pos_y);
-    } else {
-        ASSERT(regs.dst_params.size_z == 1);
-        ASSERT(regs.src_pitch == regs.x_count);
+        const std::size_t dst_layer_size = Texture::CalculateSize(
+            true, src_bytes_per_pixel, regs.dst_params.size_x, regs.dst_params.size_y, 1,
+            regs.dst_params.BlockHeight(), regs.dst_params.BlockDepth());
 
-        const u32 src_bpp = regs.src_pitch / regs.x_count;
+        const std::size_t src_size = regs.src_pitch * regs.y_count;
 
-        FlushAndInvalidate(regs.src_pitch * regs.y_count,
-                           regs.dst_params.size_x * regs.dst_params.size_y * src_bpp);
+        if (read_buffer.size() < src_size) {
+            read_buffer.resize(src_size);
+        }
+
+        if (write_buffer.size() < dst_size) {
+            write_buffer.resize(dst_size);
+        }
+
+        memory_manager.ReadBlock(source, read_buffer.data(), src_size);
+        memory_manager.ReadBlock(dest, write_buffer.data(), dst_size);
 
         // If the input is linear and the output is tiled, swizzle the input and copy it over.
         Texture::SwizzleSubrect(regs.x_count, regs.y_count, regs.src_pitch, regs.dst_params.size_x,
-                                src_bpp, dst_ptr, source_ptr, regs.dst_params.BlockHeight());
+                                src_bytes_per_pixel,
+                                write_buffer.data() + dst_layer_size * regs.dst_params.pos_z,
+                                read_buffer.data(), regs.dst_params.BlockHeight());
+
+        memory_manager.WriteBlock(dest, write_buffer.data(), dst_size);
     }
 }
 

src/video_core/engines/maxwell_dma.h

@@ -6,6 +6,7 @@
 
 #include <array>
 #include <cstddef>
+#include <vector>
 #include "common/bit_field.h"
 #include "common/common_funcs.h"
 #include "common/common_types.h"
@@ -155,6 +156,13 @@ public:
                     BitField<16, 2, u32> component_size;
                     BitField<20, 3, u32> src_num_components;
                     BitField<24, 3, u32> dst_num_components;
+
+                    u32 SrcBytePerPixel() const {
+                        return src_num_components.Value() * component_size.Value();
+                    }
+                    u32 DstBytePerPixel() const {
+                        return dst_num_components.Value() * component_size.Value();
+                    }
                 } swizzle_config;
 
                 Parameters dst_params;
@@ -176,6 +184,9 @@ private:
 
     MemoryManager& memory_manager;
 
+    std::vector<u8> read_buffer;
+    std::vector<u8> write_buffer;
+
     /// Performs the copy from the source buffer to the destination buffer as configured in the
     /// registers.
     void HandleCopy();