5 files changed, 37 insertions, 18 deletions

diff --git a/src/video_core/memory_manager.cpp b/src/video_core/memory_manager.cpp
index e66af4443..d2b9d5f2b 100644
--- a/src/video_core/memory_manager.cpp
+++ b/src/video_core/memory_manager.cpp
@@ -80,7 +80,6 @@ void MemoryManager::Unmap(GPUVAddr gpu_addr, std::size_t size) {
         rasterizer->UnmapMemory(*cpu_addr, map.second);
     }
 
-
     UpdateRange(gpu_addr, PageEntry::State::Unmapped, size);
 }
 
diff --git a/src/video_core/memory_manager.h b/src/video_core/memory_manager.h
index 305c4b1f1..99d13e7f6 100644
--- a/src/video_core/memory_manager.h
+++ b/src/video_core/memory_manager.h
@@ -114,22 +114,22 @@ public:
     void WriteBlockUnsafe(GPUVAddr gpu_dest_addr, const void* src_buffer, std::size_t size);
 
     /**
-     * IsGranularRange checks if a gpu region can be simply read with a pointer.
+     * Checks if a gpu region can be simply read with a pointer.
      */
     [[nodiscard]] bool IsGranularRange(GPUVAddr gpu_addr, std::size_t size) const;
 
     /**
-     * IsContinousRange checks if a gpu region is mapped by a single range of cpu addresses.
+     * Checks if a gpu region is mapped by a single range of cpu addresses.
      */
     [[nodiscard]] bool IsContinousRange(GPUVAddr gpu_addr, std::size_t size) const;
 
     /**
-     * IsFullyMappedRange checks if a gpu region is mapped entirely.
+     * Checks if a gpu region is mapped entirely.
      */
     [[nodiscard]] bool IsFullyMappedRange(GPUVAddr gpu_addr, std::size_t size) const;
 
     /**
-     * GetSubmappedRange returns a vector with all the subranges of cpu addresses mapped beneath.
+     * Returns a vector with all the subranges of cpu addresses mapped beneath.
      * if the region is continous, a single pair will be returned. If it's unmapped, an empty vector
      * will be returned;
      */
diff --git a/src/video_core/rasterizer_interface.h b/src/video_core/rasterizer_interface.h
index c0ba32346..0cec4225b 100644
--- a/src/video_core/rasterizer_interface.h
+++ b/src/video_core/rasterizer_interface.h
@@ -87,7 +87,7 @@ public:
     /// Unmap memory range
     virtual void UnmapMemory(VAddr addr, u64 size) = 0;
 
-    /// Unmap memory range
+    /// Remap GPU memory range. This means underneath backing memory changed
     virtual void ModifyGPUMemory(GPUVAddr addr, u64 size) = 0;
 
     /// Notify rasterizer that any caches of the specified region should be flushed to Switch memory
diff --git a/src/video_core/texture_cache/image_base.h b/src/video_core/texture_cache/image_base.h
index fd14a3980..65e68cbb3 100644
--- a/src/video_core/texture_cache/image_base.h
+++ b/src/video_core/texture_cache/image_base.h
@@ -26,11 +26,12 @@ enum class ImageFlagBits : u32 {
     Registered = 1 << 6,  ///< True when the image is registered
     Picked = 1 << 7,      ///< Temporary flag to mark the image as picked
     Remapped = 1 << 8,    ///< Image has been remapped.
+    Sparse = 1 << 9,      ///< Image has non continous submemory.
 
     // Garbage Collection Flags
-    BadOverlap = 1 << 9, ///< This image overlaps other but doesn't fit, has higher
+    BadOverlap = 1 << 10,///< This image overlaps other but doesn't fit, has higher
                          ///< garbage collection priority
-    Alias = 1 << 10,     ///< This image has aliases and has priority on garbage
+    Alias = 1 << 11,     ///< This image has aliases and has priority on garbage
                          ///< collection
 };
 DECLARE_ENUM_FLAG_OPERATORS(ImageFlagBits)
@@ -92,7 +93,28 @@ struct ImageBase {
     std::vector<AliasedImage> aliased_images;
     std::vector<ImageId> overlapping_images;
     ImageMapId map_view_id{};
-    bool is_sparse{};
+};
+
+struct ImageMapView {
+    explicit ImageMapView(GPUVAddr gpu_addr, VAddr cpu_addr, size_t size, ImageId image_id);
+
+    [[nodiscard]] bool Overlaps(VAddr overlap_cpu_addr, size_t overlap_size) const noexcept {
+        const VAddr overlap_end = overlap_cpu_addr + overlap_size;
+        const VAddr cpu_addr_end = cpu_addr + size;
+        return cpu_addr < overlap_end && overlap_cpu_addr < cpu_addr_end;
+    }
+
+    [[nodiscard]] bool OverlapsGPU(GPUVAddr overlap_gpu_addr, size_t overlap_size) const noexcept {
+        const GPUVAddr overlap_end = overlap_gpu_addr + overlap_size;
+        const GPUVAddr gpu_addr_end = gpu_addr + size;
+        return gpu_addr < overlap_end && overlap_gpu_addr < gpu_addr_end;
+    }
+
+    GPUVAddr gpu_addr;
+    VAddr cpu_addr;
+    size_t size;
+    ImageId image_id;
+    bool picked{};
 };
 
 struct ImageAllocBase {
diff --git a/src/video_core/texture_cache/texture_cache.h b/src/video_core/texture_cache/texture_cache.h
index 1704fc48c..500c4dd52 100644
--- a/src/video_core/texture_cache/texture_cache.h
+++ b/src/video_core/texture_cache/texture_cache.h
@@ -156,9 +156,6 @@ public:
     /// Remove images in a region
     void UnmapGPUMemory(GPUVAddr gpu_addr, size_t size);
 
-    /// Used when GPU memory changes layout on sparse textures.
-    // void CheckRemaps();
-
     /// Blit an image with the given parameters
     void BlitImage(const Tegra::Engines::Fermi2D::Surface& dst,
                    const Tegra::Engines::Fermi2D::Surface& src,
@@ -1179,8 +1176,9 @@ ImageId TextureCache<P>::JoinImages(const ImageInfo& info, GPUVAddr gpu_addr, VA
     const ImageId new_image_id = slot_images.insert(runtime, new_info, gpu_addr, cpu_addr);
     Image& new_image = slot_images[new_image_id];
 
-    new_image.is_sparse =
-        !gpu_memory.IsContinousRange(new_image.gpu_addr, new_image.guest_size_bytes);
+    if (!gpu_memory.IsContinousRange(new_image.gpu_addr, new_image.guest_size_bytes)) {
+        new_image.flags |= ImageFlagBits::Sparse;
+    }
 
     for (const ImageId overlap_id : ignore_textures) {
         Image& overlap = slot_images[overlap_id];
@@ -1519,7 +1517,7 @@ void TextureCache<P>::RegisterImage(ImageId image_id) {
     total_used_memory += Common::AlignUp(tentative_size, 1024);
     ForEachGPUPage(image.gpu_addr, image.guest_size_bytes,
                    [this, image_id](u64 page) { gpu_page_table[page].push_back(image_id); });
-    if (!image.is_sparse) {
+    if (False(image.flags & ImageFlagBits::Sparse)) {
         auto map_id =
             slot_map_views.insert(image.gpu_addr, image.cpu_addr, image.guest_size_bytes, image_id);
         ForEachCPUPage(image.cpu_addr, image.guest_size_bytes,
@@ -1574,7 +1572,7 @@ void TextureCache<P>::UnregisterImage(ImageId image_id) {
         };
     ForEachGPUPage(image.gpu_addr, image.guest_size_bytes,
                    [this, &clear_page_table](u64 page) { clear_page_table(page, gpu_page_table); });
-    if (!image.is_sparse) {
+    if (False(image.flags & ImageFlagBits::Sparse)) {
         const auto map_id = image.map_view_id;
         ForEachCPUPage(image.cpu_addr, image.guest_size_bytes, [this, map_id](u64 page) {
             const auto page_it = page_table.find(page);
@@ -1633,7 +1631,7 @@ template <class P>
 void TextureCache<P>::TrackImage(ImageBase& image, ImageId image_id) {
     ASSERT(False(image.flags & ImageFlagBits::Tracked));
     image.flags |= ImageFlagBits::Tracked;
-    if (!image.is_sparse) {
+    if (False(image.flags & ImageFlagBits::Sparse)) {
         rasterizer.UpdatePagesCachedCount(image.cpu_addr, image.guest_size_bytes, 1);
         return;
     }
@@ -1659,7 +1657,7 @@ template <class P>
 void TextureCache<P>::UntrackImage(ImageBase& image, ImageId image_id) {
     ASSERT(True(image.flags & ImageFlagBits::Tracked));
     image.flags &= ~ImageFlagBits::Tracked;
-    if (!image.is_sparse) {
+    if (False(image.flags & ImageFlagBits::Sparse)) {
         rasterizer.UpdatePagesCachedCount(image.cpu_addr, image.guest_size_bytes, -1);
         return;
     }