texture_cache: Correct copying between compressed and uncompressed formats

src/video_core/texture_cache/surface_base.h

@@ -235,9 +235,8 @@ private:
 
         for (u32 layer = 0; layer < layers; layer++) {
             for (u32 level = 0; level < mipmaps; level++) {
-                const u32 width{std::min(params.GetMipWidth(level), in_params.GetMipWidth(level))};
-                const u32 height{
-                    std::min(params.GetMipHeight(level), in_params.GetMipHeight(level))};
+                const u32 width = SurfaceParams::IntersectWidth(params, in_params, level, level);
+                const u32 height = SurfaceParams::IntersectHeight(params, in_params, level, level);
                 result.emplace_back(width, height, layer, level);
             }
         }
@@ -250,8 +249,8 @@ private:
         result.reserve(mipmaps);
 
         for (u32 level = 0; level < mipmaps; level++) {
-            const u32 width{std::min(params.GetMipWidth(level), in_params.GetMipWidth(level))};
-            const u32 height{std::min(params.GetMipHeight(level), in_params.GetMipHeight(level))};
+            const u32 width = SurfaceParams::IntersectWidth(params, in_params, level, level);
+            const u32 height = SurfaceParams::IntersectHeight(params, in_params, level, level);
             const u32 depth{std::min(params.GetMipDepth(level), in_params.GetMipDepth(level))};
             result.emplace_back(width, height, depth, level);
         }

src/video_core/texture_cache/surface_params.h

@@ -140,6 +140,26 @@ public:
         return (height * bh2 + bh1 - 1) / bh1;
     }
 
+    // this finds the maximun possible width between 2 2D layers of different formats
+    static u32 IntersectWidth(const SurfaceParams& src_params, const SurfaceParams& dst_params,
+                              const u32 src_level, const u32 dst_level) {
+        const u32 bw1 = src_params.GetDefaultBlockWidth();
+        const u32 bw2 = dst_params.GetDefaultBlockWidth();
+        const u32 t_src_width = (src_params.GetMipWidth(src_level) * bw2 + bw1 - 1) / bw1;
+        const u32 t_dst_width = (dst_params.GetMipWidth(dst_level) * bw1 + bw2 - 1) / bw2;
+        return std::min(t_src_width, t_dst_width);
+    }
+
+    // this finds the maximun possible height between 2 2D layers of different formats
+    static u32 IntersectHeight(const SurfaceParams& src_params, const SurfaceParams& dst_params,
+                               const u32 src_level, const u32 dst_level) {
+        const u32 bh1 = src_params.GetDefaultBlockHeight();
+        const u32 bh2 = dst_params.GetDefaultBlockHeight();
+        const u32 t_src_height = (src_params.GetMipHeight(src_level) * bh2 + bh1 - 1) / bh1;
+        const u32 t_dst_height = (dst_params.GetMipHeight(dst_level) * bh1 + bh2 - 1) / bh2;
+        return std::min(t_src_height, t_dst_height);
+    }
+
     /// Returns the default block width.
     u32 GetDefaultBlockWidth() const {
         return VideoCore::Surface::GetDefaultBlockWidth(pixel_format);

src/video_core/texture_cache/texture_cache.h

@@ -444,11 +444,9 @@ private:
             }
             modified |= surface->IsModified();
             // Now we got all the data set up
-            const u32 dst_width{params.GetMipWidth(mipmap)};
-            const u32 dst_height{params.GetMipHeight(mipmap)};
-            const CopyParams copy_params(0, 0, 0, 0, 0, layer, 0, mipmap,
-                                         std::min(src_params.width, dst_width),
-                                         std::min(src_params.height, dst_height), 1);
+            const u32 width = SurfaceParams::IntersectWidth(src_params, params, 0, mipmap);
+            const u32 height = SurfaceParams::IntersectHeight(src_params, params, 0, mipmap);
+            const CopyParams copy_params(0, 0, 0, 0, 0, layer, 0, mipmap, width, height, 1);
             passed_tests++;
             ImageCopy(surface, new_surface, copy_params);
         }