From b7b335ac632d63be3c8a5f64339950bfc99cac8d Mon Sep 17 00:00:00 2001
From: nmzik <Nmzik@mail.ru>
Date: Sat, 10 Oct 2026 23:47:47 +0200
Subject: [PATCH] gpu: admit block-compressed textures in PS5 R64 tiling

---
 src/graphics/guest_gpu/tile.cpp        |  4 +-
 tests/ShaderRecompilerComputeTests.cpp | 58 +++++++++++++++++++-------
 2 files changed, 45 insertions(+), 17 deletions(-)

diff --git a/src/graphics/guest_gpu/tile.cpp b/src/graphics/guest_gpu/tile.cpp
index 3d07ae06..7043ca40 100644
--- a/src/graphics/guest_gpu/tile.cpp
+++ b/src/graphics/guest_gpu/tile.cpp
@@ -299,8 +299,8 @@ bool TileGetTextureBlockLayout(Prospero::BufferFormat format, Prospero::TileMode
 	if (!TileGetTextureElementLayout(format, element)) {
 		return false;
 	}
-	if ((family == TileBlockFamily::Depth64KB || family == TileBlockFamily::RenderTarget64KB) &&
-	    Prospero::RenderTargetBytesPerElement(format) != element.bytes) {
+	if (family == TileBlockFamily::Depth64KB &&
+	    (element.texel_width != 1 || element.texel_height != 1)) {
 		return false;
 	}
 
diff --git a/tests/ShaderRecompilerComputeTests.cpp b/tests/ShaderRecompilerComputeTests.cpp
index e8aa0e55..bb6d3339 100644
--- a/tests/ShaderRecompilerComputeTests.cpp
+++ b/tests/ShaderRecompilerComputeTests.cpp
@@ -17744,39 +17744,47 @@ public:
     }
 
     // Exercise the real texture-layout/info-building seam for every format
-    // admitted by each standard tile mode.  Formats sharing a byte/block width
+    // admitted by each texture tile mode.  Formats sharing a byte/block width
     // intentionally share a shader, but this loop still validates their
     // texel-to-element conversion (notably every BCn format).
-    struct StandardMode {
+    struct TextureMode {
       Prospero::TileMode tile;
       TileBlockFamily family;
     };
-    constexpr StandardMode standard_modes[] = {
+    constexpr TextureMode texture_modes[] = {
         {Prospero::TileMode::kStandard256B, TileBlockFamily::Standard256B},
         {Prospero::TileMode::kStandard4KB, TileBlockFamily::Standard4KB},
         {Prospero::TileMode::kStandard64KB, TileBlockFamily::Standard64KB},
         {Prospero::TileMode::kPrt, TileBlockFamily::Prt64KB},
+        {Prospero::TileMode::kRenderTarget, TileBlockFamily::RenderTarget64KB},
+        {Prospero::TileMode::kDepth, TileBlockFamily::Depth64KB},
     };
-    struct RenderTargetFormatCase {
+    struct TextureTileFormatCase {
       Prospero::BufferFormat format;
       u32 bytes_per_element;
+      bool depth_supported;
     };
-    constexpr RenderTargetFormatCase render_target_formats[] = {
-        {Prospero::BufferFormat::k8Srgb, 1},
-        {Prospero::BufferFormat::k8_8Srgb, 2},
-        {Prospero::BufferFormat::k9_9_9_5Float, 0},
+    constexpr TextureTileFormatCase texture_tile_formats[] = {
+        {Prospero::BufferFormat::k8Srgb, 1, true},
+        {Prospero::BufferFormat::k8_8Srgb, 2, true},
+        {Prospero::BufferFormat::k9_9_9_5Float, 4, true},
+        {Prospero::BufferFormat::kBc1Srgb, 8, false},
+        {Prospero::BufferFormat::kBc7Srgb, 16, false},
+        {Prospero::BufferFormat::k32_32_32_32Float, 16, false},
     };
-    for (const auto &test : render_target_formats) {
+    for (const auto &test : texture_tile_formats) {
       for (const auto tile :
            {Prospero::TileMode::kDepth, Prospero::TileMode::kRenderTarget}) {
         TileTextureBlockLayout texture{};
         const bool supported =
             TileGetTextureBlockLayout(test.format, tile, false, texture);
-        Require(name, "RT format policy",
-                supported == (test.bytes_per_element != 0) &&
+        const bool expected = tile == Prospero::TileMode::kRenderTarget ||
+                              test.depth_supported;
+        Require(name, "texture tile format policy",
+                supported == expected &&
                     (!supported || texture.block.bytes_per_element ==
                                        test.bytes_per_element),
-                "RT/depth tile format support or element size is incorrect");
+                "texture tile policy used attachment format restrictions");
       }
     }
     {
@@ -17809,7 +17817,7 @@ public:
       if (Prospero::IsFmaskTextureFormat(format)) {
         continue;
       }
-      for (const auto &mode : standard_modes) {
+      for (const auto &mode : texture_modes) {
         TileTextureBlockLayout texture{};
         if (!TileGetTextureBlockLayout(format, mode.tile, false, texture)) {
           continue;
@@ -17846,7 +17854,27 @@ public:
       }
     }
     Require(name, "format coverage", format_cases != 0,
-            "no CPU-supported standard formats were tested");
+            "no CPU-supported texture formats were tested");
+
+    {
+      constexpr auto format = Prospero::BufferFormat::kBc1Srgb;
+      constexpr auto tile = Prospero::TileMode::kRenderTarget;
+      constexpr u32 layers = 8;
+      const auto captured =
+          MakeTilingImage(format, 2048, 2048, 1, layers, tile, 0, false);
+      Require(name, "PPSA19577 BC1 array footprint",
+              captured.data.size == 0x1000000 &&
+                  captured.tiled_slice_stride == 0x200000 &&
+                  captured.first_tail_level == 1 &&
+                  captured.tiling.block.block_width == 128 &&
+                  captured.tiling.block.block_height == 64 &&
+                  captured.mip_layout[0].pitch == 512 &&
+                  captured.mip_layout[0].height == 512,
+              "R64 BC1 texture lost its compressed blocks or array stride");
+      const auto small =
+          MakeTilingImage(format, 67, 51, 1, layers, tile, 0, false);
+      check_round_trip("R64 BC1 array", small.data.size, small);
+    }
 
     {
       constexpr auto format = Prospero::BufferFormat::k11_11_10UInt;
@@ -17949,7 +17977,7 @@ public:
       check_round_trip("array", total.size, layout);
     }
 
-    for (const auto &mode : standard_modes) {
+    for (const auto &mode : texture_modes) {
       constexpr auto format = Prospero::BufferFormat::k32Float;
       constexpr u32 levels = 2;
       TileBlockLayout block{};