Merge pull request #3434 from namkazt/patch-2

vk_shader: Implement ImageLoad

src/video_core/renderer_vulkan/vk_device.cpp

@@ -107,6 +107,8 @@ bool VKDevice::Create(const vk::DispatchLoaderDynamic& dldi, vk::Instance instan
     features.occlusionQueryPrecise = true;
     features.fragmentStoresAndAtomics = true;
     features.shaderImageGatherExtended = true;
+    features.shaderStorageImageReadWithoutFormat =
+        is_shader_storage_img_read_without_format_supported;
     features.shaderStorageImageWriteWithoutFormat = true;
     features.textureCompressionASTC_LDR = is_optimal_astc_supported;
 
@@ -465,6 +467,8 @@ void VKDevice::SetupFamilies(const vk::DispatchLoaderDynamic& dldi, vk::SurfaceK
 
 void VKDevice::SetupFeatures(const vk::DispatchLoaderDynamic& dldi) {
     const auto supported_features{physical.getFeatures(dldi)};
+    is_shader_storage_img_read_without_format_supported =
+        supported_features.shaderStorageImageReadWithoutFormat;
     is_optimal_astc_supported = IsOptimalAstcSupported(supported_features, dldi);
 }
 

src/video_core/renderer_vulkan/vk_device.h

@@ -122,6 +122,11 @@ public:
         return properties.limits.maxPushConstantsSize;
     }
 
+    /// Returns true if Shader storage Image Read Without Format supported.
+    bool IsShaderStorageImageReadWithoutFormatSupported() const {
+        return is_shader_storage_img_read_without_format_supported;
+    }
+
     /// Returns true if ASTC is natively supported.
     bool IsOptimalAstcSupported() const {
         return is_optimal_astc_supported;
@@ -227,6 +232,8 @@ private:
     bool ext_depth_range_unrestricted{};       ///< Support for VK_EXT_depth_range_unrestricted.
     bool ext_shader_viewport_index_layer{};    ///< Support for VK_EXT_shader_viewport_index_layer.
     bool nv_device_diagnostic_checkpoints{};   ///< Support for VK_NV_device_diagnostic_checkpoints.
+    bool is_shader_storage_img_read_without_format_supported{}; ///< Support for shader storage
+                                                                ///< image read without format
 
     // Telemetry parameters
     std::string vendor_name;                      ///< Device's driver name.

src/video_core/renderer_vulkan/vk_shader_decompiler.cpp

@@ -292,6 +292,10 @@ public:
             }
         }
 
+        if (device.IsShaderStorageImageReadWithoutFormatSupported()) {
+            AddCapability(spv::Capability::StorageImageReadWithoutFormat);
+        }
+
         if (device.IsFloat16Supported()) {
             AddCapability(spv::Capability::Float16);
         }
@@ -1755,8 +1759,16 @@ private:
     }
 
     Expression ImageLoad(Operation operation) {
-        UNIMPLEMENTED();
-        return {};
+        if (!device.IsShaderStorageImageReadWithoutFormatSupported()) {
+            return {v_float_zero, Type::Float};
+        }
+
+        const auto& meta{std::get<MetaImage>(operation.GetMeta())};
+
+        const Id coords = GetCoordinates(operation, Type::Int);
+        const Id texel = OpImageRead(t_uint4, GetImage(operation), coords);
+
+        return {OpCompositeExtract(t_uint, texel, meta.element), Type::Uint};
     }
 
     Expression ImageStore(Operation operation) {