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graphics: write small GPU-written tiled images back to guest memory behind --readback-tiled-images

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Co-authored-by: Dimitar Vagalinski <275970482+overlordxrz-source@users.noreply.github.com>
Co-authored-by: Mr. Big Britches <111622360+MrBigBritches@users.noreply.github.com>
This commit is contained in:
TheCruZ
2026-10-21 20:55:02 +02:00
committed by nmzik
parent 80932f8da1
commit c07ad621f2
10 changed files with 36 additions and 4 deletions
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src/graphics/host_gpu/renderer/cache/textureCache.cpp
Vendored
+13 -3
View File
@@ -34,6 +34,8 @@ namespace Libs::Graphics {
namespace {
constexpr uint64_t NumFramesBeforeRemoval = 32;
// Largest GPU-written tiled image (in texels) that is written back to guest memory on submit.
constexpr uint64_t SmallTiledReadbackTexels = 64 * 64;
[[nodiscard]] bool DecodeColorClear(const TextureCache::ImageDesc& desc, uint8_t code,
vk::ClearColorValue& clear) {
@@ -122,7 +124,8 @@ TextureCache::TextureCache(GraphicContext& graphics, CommandScheduler& scheduler
m_blit_helper(graphics, scheduler),
m_tiler(graphics, scheduler, buffer_cache.GetUtilityBuffer(MemoryUsage::Stream)),
m_buffer_cache(buffer_cache),
m_readback_linear_images(Config::ReadbackLinearImagesEnabled()) {
m_readback_linear_images(Config::ReadbackLinearImagesEnabled()),
m_readback_tiled_images(Config::ReadbackTiledImagesEnabled()) {
if (m_graphics.CanReportMemoryUsage()) {
constexpr int64_t GiB = 1024ll * 1024 * 1024;
const auto budget =
@@ -401,7 +404,14 @@ void TextureCache::UntrackImageTail(ImageId id) {
}
void TextureCache::TrackImageDownload(ImageId id, Image& image) {
if (m_readback_linear_images && !image.info.IsTiled()) {
// Small tiled targets are written back too: games read GPU results such as reductions and
// simulation state from them on the CPU (PPSA04263 keeps the origin of its ocean wave grid
// in a 1x1 R32G32 target, and its water physics read it to sample the wave heights).
const auto& info = image.info;
const auto texels = static_cast<uint64_t>(info.extent.width) * info.extent.height *
info.extent.depth * info.resources.layers;
if (info.IsTiled() ? m_readback_tiled_images && texels <= SmallTiledReadbackTexels
: m_readback_linear_images) {
if (!image.IsGpuModified()) {
EXIT("TextureCache: cannot enroll a non-GPU-owned image for download\n");
}
@@ -1956,7 +1966,7 @@ void TextureCache::RunGarbageCollector() {
}
void TextureCache::ProcessDownloadImages() {
if (!m_readback_linear_images) {
if (!m_readback_linear_images && !m_readback_tiled_images) {
return;
}
std::scoped_lock lock {m_lock};
src/graphics/host_gpu/renderer/cache/textureCache.h
Vendored
+1
View File
@@ -180,6 +180,7 @@ private:
uint64_t m_gc_tick = 0;
mutable uint32_t m_image_query_epoch = 0;
bool m_readback_linear_images = false;
bool m_readback_tiled_images = false;
friend struct TextureCacheTestAccess;
friend class BufferCache;