video_core: temporal upscale stand-in for Fortune's Weave's DLSS

The one-frame blit left 3D edges aliased and shaking: the game jitters
its camera every frame for DLSS to accumulate. Fire Emblem: Fortune's
Weave's first DLSS pass (also rejected) has the motion vectors
(cbuf0+0x290, R16G16) and the frame's jitter (+0x1b0/+0x1b4, in input
pixels). Kepler compute keeps them, and the stand-in for the last
network pass now draws temporal_upscale.frag: input samples placed where
the jitter put them and weighted by distance, blended with the previous
result reprojected along the motion vectors (Catmull-Rom) and clipped to
the 3x3 neighbourhood in YCoCg. The history is copied from the result
right after drawing it, so post-processing the game later applies to its
output does not feed back. EDEN_NX2_TEMPORAL_UPSCALE=0 restores the blit.

Assisted-by: Claude Opus 5.5 (debugging, implementation and drafting)
Signed-off-by: Duck912 <350528965+Duck912@users.noreply.github.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/video_core/renderer_vulkan/vk_rasterizer.cpp b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
index cb31a0e7e4..c0e8825bac 100644
--- a/src/video_core/renderer_vulkan/vk_rasterizer.cpp
+++ b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
@@ -1231,6 +1231,14 @@ bool RasterizerVulkan::AccelerateSurfaceCopy(const Tegra::Engines::Fermi2D::Surf
     return texture_cache.BlitImage(dst, src, copy_config);
 }
 
+bool RasterizerVulkan::AccelerateTemporalUpscale(
+    const Tegra::Engines::Fermi2D::Surface& src, const Tegra::Engines::Fermi2D::Surface& dst,
+    const Tegra::Engines::Fermi2D::Surface& motion_vectors, std::array<f32, 2> jitter,
+    std::array<f32, 2> motion_scale) {
+    std::scoped_lock lock{texture_cache.mutex};
+    return texture_cache.TemporalUpscale(dst, src, motion_vectors, jitter, motion_scale);
+}
+
 Tegra::Engines::AccelerateDMAInterface& RasterizerVulkan::AccessAccelerateDMA() {
     return accelerate_dma;
 }