fix(shader): Fix integer texture format mismatch in SPIR-V

- Add is_integer field to TextureDescriptor and TextureDefinition
- Use IsTexturePixelFormatInteger to detect integer textures
- Update ImageType to use U32[1] for integer textures, F32[1] for float
- Merge is_integer flag when combining texture descriptors

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/shader_recompiler/backend/spirv/spirv_emit_context.cpp

@@ -28,7 +28,8 @@ enum class Operation {
 
 Id ImageType(EmitContext& ctx, const TextureDescriptor& desc) {
     const spv::ImageFormat format{spv::ImageFormat::Unknown};
-    const Id type{ctx.F32[1]};
+    // Use integer type for integer textures to match the actual texture format
+    const Id type{desc.is_integer ? ctx.U32[1] : ctx.F32[1]};
     const bool depth{desc.is_depth};
     const bool ms{desc.is_multisample};
     switch (desc.type) {
@@ -1384,6 +1385,7 @@ void EmitContext::DefineTextures(const Info& info, u32& binding, u32& scaling_in
             .image_type = image_type,
             .count = desc.count,
             .is_multisample = desc.is_multisample,
+            .is_integer = desc.is_integer,
         });
         if (profile.supported_spirv >= 0x00010400) {
             interfaces.push_back(id);

src/shader_recompiler/backend/spirv/spirv_emit_context.h

@@ -1,4 +1,5 @@
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
@@ -36,6 +37,7 @@ struct TextureDefinition {
     Id image_type;
     u32 count;
     bool is_multisample;
+    bool is_integer;
 };
 
 struct TextureBufferDefinition {

src/shader_recompiler/ir_opt/texture_pass.cpp

@@ -1,4 +1,5 @@
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <algorithm>
@@ -441,6 +442,7 @@ public:
         })};
         // TODO: Read this from TIC
         texture_descriptors[index].is_multisample |= desc.is_multisample;
+        texture_descriptors[index].is_integer |= desc.is_integer;
         return index;
     }
 
@@ -664,10 +666,12 @@ void TexturePass(Environment& env, IR::Program& program, const HostTranslateInfo
                     .size_shift = DESCRIPTOR_SIZE_SHIFT,
                 });
             } else {
+                const bool is_integer{IsTexturePixelFormatInteger(env, cbuf)};
                 index = descriptors.Add(TextureDescriptor{
                     .type = flags.type,
                     .is_depth = flags.is_depth != 0,
                     .is_multisample = is_multisample,
+                    .is_integer = is_integer,
                     .has_secondary = cbuf.has_secondary,
                     .cbuf_index = cbuf.index,
                     .cbuf_offset = cbuf.offset,

src/shader_recompiler/shader_info.h

@@ -213,6 +213,7 @@ struct TextureDescriptor {
     TextureType type;
     bool is_depth;
     bool is_multisample;
+    bool is_integer;
     bool has_secondary;
     u32 cbuf_index;
     u32 cbuf_offset;