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 {