From 3e07b466ebd43f90ccfc4b2a79fe7fd62843f94a Mon Sep 17 00:00:00 2001
From: crueter <crueter@eden-emu.dev>
Date: Sun, 23 Aug 2026 17:31:09 +0200
Subject: [vulkan] Adjustments on MSAA and BlitHelpers (#4287)

PR/Commit Owner: CamilleLaVey

This PR contains changes complementary to the MSAA refactor from some weeks ago, adds proper shader convert to depth, stencil for msaa and non msaa convertions; removes redundant helpers and unify paths on the resolve functions, just to make the readability and maintainability better; includes fixes for the blit operations on Nvidia, Intel/Windows (previously banned) and ensures Linux retain the fix without extra burden; fixes the QCOM driver bug on resolution upscaling on any games above x1 (includes turnip on A8xx series) and fixes crashes/ resolution upscaled bugs on certain games that used to have wrong viewporting effect on screen or directly device loss on Vulkan. Adds fixes for regressions caused by previous MSAA refactor on games as Fire Emblem: Engage.

Special Thanks

1.- Big Smolio (@Gidoly)

Co-authored-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4287
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: Samuel <lizzie@eden-emu.dev>
---
 src/video_core/texture_cache/texture_cache.h | 34 ++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 7 deletions(-)

(limited to 'src/video_core/texture_cache/texture_cache.h')

diff --git a/src/video_core/texture_cache/texture_cache.h b/src/video_core/texture_cache/texture_cache.h
index 98a5e053a7..bcc40afde0 100644
--- a/src/video_core/texture_cache/texture_cache.h
+++ b/src/video_core/texture_cache/texture_cache.h
@@ -134,7 +134,7 @@ void TextureCache<P>::RunGarbageCollector() {
         if (True(image.flags & ImageFlagBits::IsDecoding)) {
             return false;
         }
-        const bool must_download = image.IsSafeDownload() && False(image.flags & ImageFlagBits::BadOverlap);
+        const bool must_download = IsDownloadable(image) && False(image.flags & ImageFlagBits::BadOverlap);
         if ((!aggressive_mode && True(image.flags & ImageFlagBits::CostlyLoad)) || (!high_priority_mode && must_download)) {
             return false;
         }
@@ -577,6 +577,7 @@ FramebufferId TextureCache<P>::GetFramebufferId(const RenderTargets& key) {
         return id ? &slot_image_views[id] : nullptr;
     });
     ImageView* const depth_buffer = key.depth_buffer_id ? &slot_image_views[key.depth_buffer_id] : nullptr;
+    runtime.FlushDeferredClear();
     framebuffer_id = slot_framebuffers.insert(runtime, color_buffers, depth_buffer, key);
     return framebuffer_id;
 }
@@ -594,11 +595,26 @@ void TextureCache<P>::WriteMemory(DAddr cpu_addr, size_t size) {
     });
 }
 
+template <class P>
+bool TextureCache<P>::IsDownloadable(const ImageBase& image) const noexcept {
+    if (!image.IsSafeGpuCopy()) {
+        return false;
+    }
+    if (image.info.num_samples == 1) {
+        return true;
+    }
+    if constexpr (P::HAS_MSAA_DOWNLOADS) {
+        return runtime.CanDownloadMsaa(image.info);
+    } else {
+        return false;
+    }
+}
+
 template <class P>
 void TextureCache<P>::DownloadMemory(DAddr cpu_addr, size_t size) {
     boost::container::small_vector<ImageId, 16> images;
-    ForEachImageInRegion(cpu_addr, size, [&images](ImageId image_id, ImageBase& image) {
-        if (!image.IsSafeDownload()) {
+    ForEachImageInRegion(cpu_addr, size, [this, &images](ImageId image_id, ImageBase& image) {
+        if (!IsDownloadable(image)) {
             return;
         }
         image.flags &= ~ImageFlagBits::GpuModified;
@@ -1476,12 +1492,12 @@ template <class P>
 bool TextureCache<P>::ScaleUp(Image& image) {
     const bool has_copy = image.HasScaled();
     const bool rescaled = image.ScaleUp();
+    if (!has_copy && image.HasScaled()) {
+        total_used_memory += GetScaledImageSizeBytes(image);
+    }
     if (!rescaled) {
         return false;
     }
-    if (!has_copy) {
-        total_used_memory += GetScaledImageSizeBytes(image);
-    }
     InvalidateScale(image);
     return true;
 }
@@ -1691,7 +1707,10 @@ ImageId TextureCache<P>::JoinImages(const ImageInfo& info, GPUVAddr gpu_addr, DA
     for (const auto& copy_object : join_copies_to_do) {
         Image& overlap = slot_images[copy_object.id];
         if (copy_object.is_alias) {
-            if (!overlap.IsSafeDownload()) {
+            if (!overlap.IsSafeGpuCopy()) {
+                continue;
+            }
+            if (overlap.info.num_samples != new_image.info.num_samples) {
                 continue;
             }
             const auto alias_pointer = join_alias_indices.find(copy_object.id);
@@ -2461,6 +2480,7 @@ void TextureCache<P>::RemoveImageViewReferences(std::span<const ImageViewId> rem
 
 template <class P>
 void TextureCache<P>::RemoveFramebuffers(std::span<const ImageViewId> removed_views) {
+    runtime.FlushDeferredClear();
     auto it = framebuffers.begin();
     while (it != framebuffers.end()) {
         if (it->first.Contains(removed_views)) {
-- 
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