spirv: More correct texel buffer usage

src/shader_recompiler/backend/spirv/emit_spirv.cpp

@@ -187,6 +187,7 @@ void DefineEntryPoint(const IR::Program& program, EmitContext& ctx, Id main) {
     ctx.AddCapability(spv::Capability::Int64);
     if (info.has_storage_images || info.has_image_buffers) {
         ctx.AddCapability(spv::Capability::StorageImageExtendedFormats);
+        ctx.AddCapability(spv::Capability::StorageImageReadWithoutFormat);
         ctx.AddCapability(spv::Capability::StorageImageWriteWithoutFormat);
     }
     if (info.has_texel_buffers) {

src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp

@@ -266,7 +266,8 @@ Id EmitLoadBufferFormatF32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id addr
     const auto& buffer = ctx.texture_buffers[handle];
     const Id tex_buffer = ctx.OpLoad(buffer.image_type, buffer.id);
     const Id coord = ctx.OpIAdd(ctx.U32[1], address, buffer.coord_offset);
-    Id texel = ctx.OpImageFetch(buffer.result_type, tex_buffer, coord);
+    Id texel = buffer.is_storage ? ctx.OpImageRead(buffer.result_type, tex_buffer, coord)
+                                 : ctx.OpImageFetch(buffer.result_type, tex_buffer, coord);
     if (buffer.is_integer) {
         texel = ctx.OpBitcast(ctx.F32[4], texel);
     }

src/shader_recompiler/backend/spirv/spirv_emit_context.cpp

@@ -406,6 +406,7 @@ void EmitContext::DefineTextureBuffers() {
             .image_type = image_type,
             .result_type = sampled_type[4],
             .is_integer = is_integer,
+            .is_storage = desc.is_written,
         });
         interfaces.push_back(id);
     }

src/shader_recompiler/backend/spirv/spirv_emit_context.h

@@ -215,6 +215,7 @@ public:
         Id image_type;
         Id result_type;
         bool is_integer;
+        bool is_storage;
     };
 
     u32& binding;