MaxwellDMA: Fixes, corrections and relaxations.

This commit fixes offsets on Linear -> Tiled copies, corrects z pos
fortiled->linear copies, corrects bytes_per_pixel calculation in tiled
-> linear copies and relaxes some limitations set by latest dma fixes
refactors.

1 files changed, 8 insertions, 6 deletions

diff --git a/src/video_core/textures/decoders.cpp b/src/video_core/textures/decoders.cpp
index 7e8295944..7df5f1452 100644
--- a/src/video_core/textures/decoders.cpp
+++ b/src/video_core/textures/decoders.cpp
@@ -257,19 +257,21 @@ std::vector<u8> UnswizzleTexture(u8* address, u32 tile_size_x, u32 tile_size_y,
 
 void SwizzleSubrect(u32 subrect_width, u32 subrect_height, u32 source_pitch, u32 swizzled_width,
                     u32 bytes_per_pixel, u8* swizzled_data, u8* unswizzled_data,
-                    u32 block_height_bit) {
+                    u32 block_height_bit, u32 offset_x, u32 offset_y) {
     const u32 block_height = 1U << block_height_bit;
     const u32 image_width_in_gobs{(swizzled_width * bytes_per_pixel + (gob_size_x - 1)) /
                                   gob_size_x};
     for (u32 line = 0; line < subrect_height; ++line) {
+        const u32 dst_y = line + offset_y;
         const u32 gob_address_y =
-            (line / (gob_size_y * block_height)) * gob_size * block_height * image_width_in_gobs +
-            ((line % (gob_size_y * block_height)) / gob_size_y) * gob_size;
-        const auto& table = legacy_swizzle_table[line % gob_size_y];
+            (dst_y / (gob_size_y * block_height)) * gob_size * block_height * image_width_in_gobs +
+            ((dst_y % (gob_size_y * block_height)) / gob_size_y) * gob_size;
+        const auto& table = legacy_swizzle_table[dst_y % gob_size_y];
         for (u32 x = 0; x < subrect_width; ++x) {
+            const u32 dst_x = x + offset_x;
             const u32 gob_address =
-                gob_address_y + (x * bytes_per_pixel / gob_size_x) * gob_size * block_height;
-            const u32 swizzled_offset = gob_address + table[(x * bytes_per_pixel) % gob_size_x];
+                gob_address_y + (dst_x * bytes_per_pixel / gob_size_x) * gob_size * block_height;
+            const u32 swizzled_offset = gob_address + table[(dst_x * bytes_per_pixel) % gob_size_x];
             u8* source_line = unswizzled_data + line * source_pitch + x * bytes_per_pixel;
             u8* dest_addr = swizzled_data + swizzled_offset;