update ImGUI extension to allow hijacking precompiled SPIRV shaders (experimental, no real validation), update examples_tests submodule

Author: AnastaZIuk

examples_tests

@@ -99,6 +99,14 @@ class UI final : public core::IReferenceCounted
 
 			//! optional, no cache used if not provided
 			core::smart_refctd_ptr<video::IGPUPipelineCache> pipelineCache = nullptr;
+
+			struct PrecompiledShaders 
+			{
+				core::smart_refctd_ptr<asset::IShader> vertex = nullptr, fragment = nullptr;
+			};
+
+			//! optional, precompiled spirv shaders (experimental)
+			std::optional<PrecompiledShaders> spirv = std::nullopt;
 		};
 
 		//! parameters which may change every frame, used with the .update call to interact with ImGuiIO; we require a very *required* minimum - if you need to cover more IO options simply get the IO with ImGui::GetIO() to customize them (they all have default values you can change before calling the .update)

include/nbl/ext/ImGui/ImGui.h

@@ -39,6 +39,7 @@ using namespace nbl::ext::imgui;
     to request per object data with BDA
 */
 
+[shader("pixel")]
 float4 PSMain(PSInput input) : SV_Target0
 {
     // BDA for requesting object data

include/nbl/ext/ImGui/builtin/hlsl/fragment.hlsl

@@ -18,6 +18,7 @@ struct VSInput
     to request per object data with BDA
 */
 
+[shader("vertex")]
 PSInput VSMain(VSInput input, uint drawID : SV_InstanceID)
 {
     PSInput output;

include/nbl/ext/ImGui/builtin/hlsl/vertex.hlsl

@@ -154,6 +154,14 @@ core::smart_refctd_ptr<video::IGPUGraphicsPipeline> UI::createPipeline(SCreation
 		smart_refctd_ptr<IShader> vertex, fragment;
 	} shaders;
 
+	if (creationParams.spirv.has_value())
+	{
+		// TODO: since prebuild is experminetal currently I don't validate anything
+		auto& spirv = creationParams.spirv.value();
+		shaders.vertex = spirv.vertex;
+		shaders.fragment = spirv.fragment;
+	}
+	else
 	{		
 		//! proxy the system, we will touch it gently
 		auto system = smart_refctd_ptr<ISystem>(creationParams.assetManager->getSystem());
@@ -269,18 +277,18 @@ core::smart_refctd_ptr<video::IGPUGraphicsPipeline> UI::createPipeline(SCreation
 
 		shaders.vertex = createShader.template operator() < NBL_CORE_UNIQUE_STRING_LITERAL_TYPE("vertex.hlsl"), IShader::E_SHADER_STAGE::ESS_VERTEX > ();
 		shaders.fragment = createShader.template operator() < NBL_CORE_UNIQUE_STRING_LITERAL_TYPE("fragment.hlsl"), IShader::E_SHADER_STAGE::ESS_FRAGMENT > ();
+	}
 
-		if (!shaders.vertex)
-		{
-			creationParams.utilities->getLogger()->log("Failed to compile vertex shader!", ILogger::ELL_ERROR);
-			return nullptr;
-		}
+	if (!shaders.vertex)
+	{
+		creationParams.utilities->getLogger()->log("Failed to create vertex shader!", ILogger::ELL_ERROR);
+		return nullptr;
+	}
 
-		if (!shaders.fragment)
-		{
-			creationParams.utilities->getLogger()->log("Failed to compile fragment shader!", ILogger::ELL_ERROR);
-			return nullptr;
-		}
+	if (!shaders.fragment)
+	{
+		creationParams.utilities->getLogger()->log("Failed to create fragment shader!", ILogger::ELL_ERROR);
+		return nullptr;
 	}
 
 	SVertexInputParams vertexInputParams{};