From dcc642551f5a9b2faf1b9b362c76d6b0c7236328 Mon Sep 17 00:00:00 2001
From: nmzik <Nmzik@mail.ru>
Date: Wed, 14 Oct 2026 21:52:58 +0200
Subject: [PATCH] graphics: classify signed byte textures for native sampling

---
 src/graphics/guest_gpu/gpu_format.cpp  |  1 +
 tests/ResourceMaterializationTests.cpp |  4 ++-
 tests/ShaderRecompilerComputeTests.cpp | 42 ++++++++++++++++++--------
 3 files changed, 33 insertions(+), 14 deletions(-)

diff --git a/src/graphics/guest_gpu/gpu_format.cpp b/src/graphics/guest_gpu/gpu_format.cpp
index f968991ea..fe0adfb8f 100644
--- a/src/graphics/guest_gpu/gpu_format.cpp
+++ b/src/graphics/guest_gpu/gpu_format.cpp
@@ -23,6 +23,7 @@ constexpr FormatInfo kFormatInfo[] = {
 	{BufferFormat::k8UScaled, 1, 0, 0, true, false},
 	{BufferFormat::k8SNorm, 1, 0, 1, true, false},
 	{BufferFormat::k8UInt, 1, 0, 1, true, true},
+	{BufferFormat::k8SInt, 1, 0, 1, true, false, true},
 	{BufferFormat::k16UNorm, 2, 0, 2, true, false},
 	{BufferFormat::k16SNorm, 2, 0, 2, true, false},
 	{BufferFormat::k16UInt, 2, 0, 2, true, true},
diff --git a/tests/ResourceMaterializationTests.cpp b/tests/ResourceMaterializationTests.cpp
index 38287b704..5106c50a9 100644
--- a/tests/ResourceMaterializationTests.cpp
+++ b/tests/ResourceMaterializationTests.cpp
@@ -1212,7 +1212,7 @@ void TestSignedStorageSpecialization() {
     Check(binding && ImageBindingResourceClass(*binding) == ImageResourceClass::Storage,
           "signed storage conversion did not reuse the unsigned storage binding");
   }
-  for (const auto format : {F::k16SInt, F::k32SInt}) {
+  for (const auto format : {F::k8SInt, F::k16SInt, F::k32SInt}) {
     data[0] = uint32_t(format) << 20u;
     auto &image = plan.info.images[0];
     image.read = true;
@@ -1232,6 +1232,8 @@ void TestSignedStorageSpecialization() {
     Check(MaterializeResources(plan, runtime, snapshot, specialization) &&
               specialization.images[0].numeric_class == N::Sint &&
               specialization.images[0].conversion_format == F::kInvalid &&
+              Libs::Graphics::Prospero::NumBytesPerElement(format) ==
+                  (format == F::k8SInt ? 1u : format == F::k16SInt ? 2u : 4u) &&
               RawSignedStorageFormat(image, format) == F::kInvalid,
           "storage conversion changed ordinary signed image reads");
     image.resource_class = ImageResourceClass::Storage;
diff --git a/tests/ShaderRecompilerComputeTests.cpp b/tests/ShaderRecompilerComputeTests.cpp
index c6206d6ef..0e9284736 100644
--- a/tests/ShaderRecompilerComputeTests.cpp
+++ b/tests/ShaderRecompilerComputeTests.cpp
@@ -35743,28 +35743,41 @@ TestCase ImageLoadFmaskUsesNativeSampleMapping() {
   return test;
 }
 
-TestCase ImageLoadR32SintUsesSignedSampledImage() {
+template <bool byte> TestCase ImageLoadSintUsesSignedSampledImage() {
   using O = ShaderOpcode;
 
   std::vector<u32> code;
-  AppendVMovU32(&code, 20, 2);
-  AppendVMovU32(&code, 21, 1);
-  code.push_back(EncodeMimg0(0x00, 0x1));
-  code.push_back(EncodeMimg1(0, 20));
-  AppendStoreVgpr(&code, 0, 0);
+  for (u32 pixel = 0; pixel < (byte ? 4u : 1u); ++pixel) {
+    AppendVMovU32(&code, 20, byte ? pixel : 2u);
+    AppendVMovU32(&code, 21, 1);
+    code.push_back(EncodeMimg0(0x00, 0x1));
+    code.push_back(EncodeMimg1(0, 20));
+    AppendStoreVgpr(&code, 0, pixel);
+  }
   AppendEnd(&code);
 
   TestCase test;
-  test.name = "ImageLoadR32SintUsesSignedSampledImage";
+  test.name = byte ? "ImageLoadR8SintUsesSignedSampledImage"
+                   : "ImageLoadR32SintUsesSignedSampledImage";
   test.code = code;
-  test.expected = {0xffffff80u};
+  if constexpr (byte) test.expected = {0xffffff80u, 0xffffffffu, 0u, 127u};
+  else test.expected = {0xffffff80u};
   test.opcodes = {O::V_MOV_B32, O::IMAGE_LOAD, O::BUFFER_STORE_DWORD,
                   O::S_ENDPGM};
-  test.sampled_image_rgba.resize(16);
-  test.sampled_image_rgba[6] = 0xffffff80u;
-  test.sampled_image_format = vk::Format::eR32Sint;
+  test.sampled_image_rgba.resize(byte ? 4u : 16u);
+  if constexpr (byte) test.sampled_image_rgba[1] = 0x7f00ff80u;
+  else test.sampled_image_rgba[6] = 0xffffff80u;
+  test.sampled_image_format = byte ? vk::Format::eR8Sint : vk::Format::eR32Sint;
   test.sampled_image_dwords_per_pixel = 1;
-  test.user_data = MakeSampledTextureData(Prospero::BufferFormat::k32SInt);
+  constexpr auto format = byte ? Prospero::BufferFormat::k8SInt : Prospero::BufferFormat::k32SInt;
+  const auto surface = TextureGetSurfaceFormatInfo(format);
+  Require(test.name, "signed format metadata",
+          Prospero::NumBytesPerElement(format) == (byte ? 1u : 4u) &&
+              Prospero::SampledTextureNumericClass(format) == Prospero::TextureNumericClass::Sint &&
+              surface.vk_format == test.sampled_image_format &&
+              surface.conversion_format == Prospero::BufferFormat::kInvalid,
+          "signed sampled image lost its byte width, native mapping or numeric class");
+  test.user_data = MakeSampledTextureData(format);
   test.has_user_data = true;
   test.required_spirv = {"image_17", "OpTypeImage %int", "OpImageFetch %v4int",
                          "OpBitcast %v4uint"};
@@ -41191,7 +41204,8 @@ std::vector<TestCase> MakeCases() {
   AddCase(ImageLoadVariants);
   AddCase(ImageLoadR32UintUsesIntegerSampledImage);
   AddCase(ImageLoadFmaskUsesNativeSampleMapping);
-  AddCase(ImageLoadR32SintUsesSignedSampledImage);
+  AddCase(ImageLoadSintUsesSignedSampledImage<false>);
+  AddCase(ImageLoadSintUsesSignedSampledImage<true>);
   AddCase(ImageLoadPackedUintUnpacksAndSwizzles);
   AddCase(ImageLoadPackedUnorm<false, false>);
   AddCase(ImageLoadPackedUnorm<false, true>);
@@ -46856,6 +46870,8 @@ int main(int argc, char **argv) {
   }
   if (argc == 2 && std::strcmp(argv[1], "--packed-texture-only") == 0) {
     VulkanHarness vulkan;
+    RunCase(&vulkan, ImageLoadSintUsesSignedSampledImage<false>());
+    RunCase(&vulkan, ImageLoadSintUsesSignedSampledImage<true>());
     vulkan.CheckPackedTextureComponents();
     CheckSigned16ImageStore(vulkan);
     vulkan.CheckBgra16Readback();