video-shader-toys/apps/LoopThroughWithOpenGLCompositing/gl/OpenGLComposite.cpp

#include "DeckLinkDisplayMode.h"
#include "OpenGLComposite.h"
#include "GLExtensions.h"
#include "GlRenderConstants.h"
#include "PngScreenshotWriter.h"
#include "RenderEngine.h"
#include "RuntimeParameterUtils.h"
#include "RuntimeServices.h"
#include "ShaderBuildQueue.h"
#include "VideoBackend.h"

#include <algorithm>
#include <cctype>
#include <chrono>
#include <cmath>
#include <ctime>
#include <filesystem>
#include <iomanip>
#include <memory>
#include <set>
#include <sstream>
#include <string>
#include <vector>

namespace
{
constexpr auto kOscOverlayCommitDelay = std::chrono::milliseconds(150);
constexpr double kOscSmoothingReferenceFps = 60.0;
constexpr double kOscSmoothingMaxStepSeconds = 0.25;

std::string SimplifyOscControlKey(const std::string& text)
{
	std::string simplified;
	for (unsigned char ch : text)
	{
		if (std::isalnum(ch))
			simplified.push_back(static_cast<char>(std::tolower(ch)));
	}
	return simplified;
}

bool MatchesOscControlKey(const std::string& candidate, const std::string& key)
{
	return candidate == key || SimplifyOscControlKey(candidate) == SimplifyOscControlKey(key);
}

double ClampOscAlpha(double value)
{
	return (std::max)(0.0, (std::min)(1.0, value));
}

double ComputeTimeBasedOscAlpha(double smoothing, double deltaSeconds)
{
	const double clampedSmoothing = ClampOscAlpha(smoothing);
	if (clampedSmoothing <= 0.0)
		return 0.0;
	if (clampedSmoothing >= 1.0)
		return 1.0;

	const double clampedDeltaSeconds = (std::max)(0.0, (std::min)(kOscSmoothingMaxStepSeconds, deltaSeconds));
	if (clampedDeltaSeconds <= 0.0)
		return 0.0;

	const double frameScale = clampedDeltaSeconds * kOscSmoothingReferenceFps;
	return ClampOscAlpha(1.0 - std::pow(1.0 - clampedSmoothing, frameScale));
}

JsonValue BuildOscCommitValue(const ShaderParameterDefinition& definition, const ShaderParameterValue& value)
{
	switch (definition.type)
	{
	case ShaderParameterType::Boolean:
		return JsonValue(value.booleanValue);
	case ShaderParameterType::Enum:
		return JsonValue(value.enumValue);
	case ShaderParameterType::Text:
		return JsonValue(value.textValue);
	case ShaderParameterType::Trigger:
	case ShaderParameterType::Float:
		return JsonValue(value.numberValues.empty() ? 0.0 : value.numberValues.front());
	case ShaderParameterType::Vec2:
	case ShaderParameterType::Color:
	{
		JsonValue array = JsonValue::MakeArray();
		for (double number : value.numberValues)
			array.pushBack(JsonValue(number));
		return array;
	}
	}

	return JsonValue();
}
}

OpenGLComposite::OpenGLComposite(HWND hWnd, HDC hDC, HGLRC hRC) :
	hGLWnd(hWnd), hGLDC(hDC), hGLRC(hRC),
	mUseCommittedLayerStates(false),
	mScreenshotRequested(false)
{
	InitializeCriticalSection(&pMutex);
	mRuntimeHost = std::make_unique<RuntimeHost>();
	mRuntimeStore = std::make_unique<RuntimeStore>(*mRuntimeHost);
	mRuntimeSnapshotProvider = std::make_unique<RuntimeSnapshotProvider>(*mRuntimeHost);
	mRuntimeCoordinator = std::make_unique<RuntimeCoordinator>(*mRuntimeStore);
	mRenderEngine = std::make_unique<RenderEngine>(
		*mRuntimeSnapshotProvider,
		mRuntimeHost->GetHealthTelemetry(),
		pMutex,
		hGLDC,
		hGLRC,
		[this]() { renderEffect(); },
		[this]() { ProcessScreenshotRequest(); },
		[this]() { paintGL(false); });
	mVideoBackend = std::make_unique<VideoBackend>(*mRenderEngine, mRuntimeHost->GetHealthTelemetry());
	mShaderBuildQueue = std::make_unique<ShaderBuildQueue>(*mRuntimeSnapshotProvider);
	mRuntimeServices = std::make_unique<RuntimeServices>();
}

OpenGLComposite::~OpenGLComposite()
{
	if (mRuntimeServices)
		mRuntimeServices->Stop();
	if (mShaderBuildQueue)
		mShaderBuildQueue->Stop();
	if (mVideoBackend)
		mVideoBackend->ReleaseResources();

	DeleteCriticalSection(&pMutex);
}

bool OpenGLComposite::InitDeckLink()
{
	return InitVideoIO();
}

bool OpenGLComposite::InitVideoIO()
{
	VideoFormatSelection		videoModes;
	std::string						initFailureReason;

	if (mRuntimeStore && mRuntimeStore->GetRuntimeRepositoryRoot().empty())
	{
		std::string runtimeError;
		if (!mRuntimeStore->InitializeStore(runtimeError))
		{
			MessageBoxA(NULL, runtimeError.c_str(), "Runtime host failed to initialize", MB_OK);
			return false;
		}
	}

	if (mRuntimeStore)
	{
		if (!ResolveConfiguredVideoFormats(
			mRuntimeStore->GetConfiguredInputVideoFormat(),
			mRuntimeStore->GetConfiguredInputFrameRate(),
			mRuntimeStore->GetConfiguredOutputVideoFormat(),
			mRuntimeStore->GetConfiguredOutputFrameRate(),
			videoModes,
			initFailureReason))
		{
			MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink mode configuration error", MB_OK);
			return false;
		}
	}

	if (!mVideoBackend->DiscoverDevicesAndModes(videoModes, initFailureReason))
	{
		const char* title = initFailureReason == "Please install the Blackmagic DeckLink drivers to use the features of this application."
			? "This application requires the DeckLink drivers installed."
			: "DeckLink initialization failed";
		MessageBoxA(NULL, initFailureReason.c_str(), title, MB_OK | MB_ICONERROR);
		return false;
	}
	const bool outputAlphaRequired = mRuntimeStore && mRuntimeStore->IsExternalKeyingConfigured();
	if (!mVideoBackend->SelectPreferredFormats(videoModes, outputAlphaRequired, initFailureReason))
		goto error;

	if (! CheckOpenGLExtensions())
	{
		initFailureReason = "OpenGL extension checks failed.";
		goto error;
	}

	if (! InitOpenGLState())
	{
		initFailureReason = "OpenGL state initialization failed.";
		goto error;
	}

	PublishVideoIOStatus(mVideoBackend->OutputModelName().empty()
		? "DeckLink output device selected."
		: ("Selected output device: " + mVideoBackend->OutputModelName()));

	// Resize window to match output video frame, but scale large formats down by half for viewing.
	if (mVideoBackend->OutputFrameWidth() < 1920)
		resizeWindow(mVideoBackend->OutputFrameWidth(), mVideoBackend->OutputFrameHeight());
	else
		resizeWindow(mVideoBackend->OutputFrameWidth() / 2, mVideoBackend->OutputFrameHeight() / 2);

	if (!mVideoBackend->ConfigureInput(videoModes.input, initFailureReason))
	{
		goto error;
	}
	if (!mVideoBackend->HasInputDevice() && mRuntimeHost)
	{
		mRuntimeHost->GetHealthTelemetry().ReportSignalStatus(
			false,
			mVideoBackend->InputFrameWidth(),
			mVideoBackend->InputFrameHeight(),
			mVideoBackend->InputDisplayModeName());
	}

	if (!mVideoBackend->ConfigureOutput(videoModes.output, mRuntimeStore && mRuntimeStore->IsExternalKeyingConfigured(), initFailureReason))
	{
		goto error;
	}

	PublishVideoIOStatus(mVideoBackend->StatusMessage());

	return true;

error:
	if (!initFailureReason.empty())
		MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink initialization failed", MB_OK | MB_ICONERROR);
	mVideoBackend->ReleaseResources();
	return false;
}

void OpenGLComposite::paintGL(bool force)
{
	if (!force)
	{
		if (IsIconic(hGLWnd))
			return;
	}

	const unsigned previewFps = mRuntimeStore ? mRuntimeStore->GetConfiguredPreviewFps() : 30u;
	if (!mRenderEngine->TryPresentPreview(force, previewFps, mVideoBackend->OutputFrameWidth(), mVideoBackend->OutputFrameHeight()))
	{
		ValidateRect(hGLWnd, NULL);
		return;
	}

	ValidateRect(hGLWnd, NULL);
}

void OpenGLComposite::resizeGL(WORD width, WORD height)
{
	// We don't set the project or model matrices here since the window data is copied directly from
	// an off-screen FBO in paintGL().  Just save the width and height for use in paintGL().
	mRenderEngine->ResizeView(width, height);
}

void OpenGLComposite::resizeWindow(int width, int height)
{
	RECT r;
	if (GetWindowRect(hGLWnd, &r))
	{
		SetWindowPos(hGLWnd, HWND_TOP, r.left, r.top, r.left + width, r.top + height, 0);
	}
}

void OpenGLComposite::PublishVideoIOStatus(const std::string& statusMessage)
{
	if (!mRuntimeHost)
		return;

	if (!statusMessage.empty())
		mVideoBackend->SetStatusMessage(statusMessage);

	mRuntimeHost->SetVideoIOStatus(
		"decklink",
		mVideoBackend->OutputModelName(),
		mVideoBackend->SupportsInternalKeying(),
		mVideoBackend->SupportsExternalKeying(),
		mVideoBackend->KeyerInterfaceAvailable(),
		mRuntimeStore ? mRuntimeStore->IsExternalKeyingConfigured() : false,
		mVideoBackend->ExternalKeyingActive(),
		mVideoBackend->StatusMessage());
}

bool OpenGLComposite::InitOpenGLState()
{
	if (! ResolveGLExtensions())
		return false;

	std::string runtimeError;
	if (mRuntimeStore->GetRuntimeRepositoryRoot().empty() && !mRuntimeStore->InitializeStore(runtimeError))
	{
		MessageBoxA(NULL, runtimeError.c_str(), "Runtime host failed to initialize", MB_OK);
		return false;
	}

	if (!mRuntimeServices->Start(*this, *mRuntimeHost, runtimeError))
	{
		MessageBoxA(NULL, runtimeError.c_str(), "Runtime control services failed to start", MB_OK);
		return false;
	}

	// Prepare the runtime shader program generated from the active shader package.
	char compilerErrorMessage[1024];
	if (!mRenderEngine->CompileDecodeShader(sizeof(compilerErrorMessage), compilerErrorMessage))
	{
		MessageBoxA(NULL, compilerErrorMessage, "OpenGL decode shader failed to load or compile", MB_OK);
		return false;
	}
	if (!mRenderEngine->CompileOutputPackShader(sizeof(compilerErrorMessage), compilerErrorMessage))
	{
		MessageBoxA(NULL, compilerErrorMessage, "OpenGL output pack shader failed to load or compile", MB_OK);
		return false;
	}

	std::string rendererError;
	if (!mRenderEngine->InitializeResources(
		mVideoBackend->InputFrameWidth(),
		mVideoBackend->InputFrameHeight(),
		mVideoBackend->CaptureTextureWidth(),
		mVideoBackend->OutputFrameWidth(),
		mVideoBackend->OutputFrameHeight(),
		mVideoBackend->OutputPackTextureWidth(),
		rendererError))
	{
		MessageBoxA(NULL, rendererError.c_str(), "OpenGL initialization error.", MB_OK);
		return false;
	}

	if (!mRenderEngine->CompileLayerPrograms(mVideoBackend->InputFrameWidth(), mVideoBackend->InputFrameHeight(), sizeof(compilerErrorMessage), compilerErrorMessage))
	{
		MessageBoxA(NULL, compilerErrorMessage, "OpenGL shader failed to load or compile", MB_OK);
		return false;
	}
	mRuntimeStore->SetCompileStatus(true, "Shader layers compiled successfully.");
	mUseCommittedLayerStates = false;

	mRenderEngine->ResetTemporalHistoryState();
	mRenderEngine->ResetShaderFeedbackState();

	broadcastRuntimeState();
	mRuntimeServices->BeginPolling(*mRuntimeHost);
	return true;
}

bool OpenGLComposite::Start()
{
	return mVideoBackend->Start();
}

bool OpenGLComposite::Stop()
{
	if (mRuntimeServices)
		mRuntimeServices->Stop();

	const bool wasExternalKeyingActive = mVideoBackend->ExternalKeyingActive();
	mVideoBackend->Stop();
	if (wasExternalKeyingActive)
		PublishVideoIOStatus("External keying has been disabled.");

	return true;
}

bool OpenGLComposite::ReloadShader(bool preserveFeedbackState)
{
	return mRuntimeCoordinator &&
		ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->RequestShaderReload(preserveFeedbackState));
}

bool OpenGLComposite::RequestScreenshot(std::string& error)
{
	(void)error;
	mScreenshotRequested.store(true);
	return true;
}

void OpenGLComposite::renderEffect()
{
	ProcessRuntimePollResults();
	std::vector<RuntimeServices::AppliedOscUpdate> appliedOscUpdates;
	std::vector<RuntimeServices::CompletedOscCommit> completedOscCommits;
	if (mRuntimeHost && mRuntimeServices)
	{
		std::string oscError;
		if (!mRuntimeServices->ApplyPendingOscUpdates(appliedOscUpdates, oscError) && !oscError.empty())
			OutputDebugStringA(("OSC apply failed: " + oscError + "\n").c_str());
		mRuntimeServices->ConsumeCompletedOscCommits(completedOscCommits);
	}

	for (const RuntimeServices::CompletedOscCommit& completedCommit : completedOscCommits)
	{
		auto overlayIt = mOscOverlayStates.find(completedCommit.routeKey);
		if (overlayIt == mOscOverlayStates.end())
			continue;

		OscOverlayState& overlay = overlayIt->second;
		if (overlay.commitQueued &&
			overlay.pendingCommitGeneration == completedCommit.generation &&
			overlay.generation == completedCommit.generation)
		{
			mOscOverlayStates.erase(overlayIt);
		}
	}

	std::set<std::string> pendingOscRouteKeys;
	const auto oscNow = std::chrono::steady_clock::now();
	for (const RuntimeServices::AppliedOscUpdate& update : appliedOscUpdates)
	{
		const std::string routeKey = update.routeKey;
		auto overlayIt = mOscOverlayStates.find(routeKey);
		if (overlayIt == mOscOverlayStates.end())
		{
			OscOverlayState overlay;
			overlay.layerKey = update.layerKey;
			overlay.parameterKey = update.parameterKey;
			overlay.targetValue = update.targetValue;
			overlay.lastUpdatedTime = oscNow;
			overlay.lastAppliedTime = oscNow;
			overlay.generation = 1;
			mOscOverlayStates[routeKey] = std::move(overlay);
		}
		else
		{
			overlayIt->second.targetValue = update.targetValue;
			overlayIt->second.lastUpdatedTime = oscNow;
			overlayIt->second.generation += 1;
			overlayIt->second.commitQueued = false;
		}
		pendingOscRouteKeys.insert(routeKey);
	}

	const auto applyOscOverlays = [&](std::vector<RuntimeRenderState>& states, bool allowCommit)
	{
		if (states.empty() || mOscOverlayStates.empty())
			return;

		const double smoothing = ClampOscAlpha(mRuntimeStore ? mRuntimeStore->GetConfiguredOscSmoothing() : 0.0);
		std::vector<std::string> overlayKeysToRemove;
		for (auto& item : mOscOverlayStates)
		{
			OscOverlayState& overlay = item.second;
			auto stateIt = std::find_if(states.begin(), states.end(),
				[&overlay](const RuntimeRenderState& state)
				{
					return MatchesOscControlKey(state.layerId, overlay.layerKey) ||
						MatchesOscControlKey(state.shaderId, overlay.layerKey) ||
						MatchesOscControlKey(state.shaderName, overlay.layerKey);
				});
			if (stateIt == states.end())
				continue;

			auto definitionIt = std::find_if(stateIt->parameterDefinitions.begin(), stateIt->parameterDefinitions.end(),
				[&overlay](const ShaderParameterDefinition& definition)
				{
					return MatchesOscControlKey(definition.id, overlay.parameterKey) ||
						MatchesOscControlKey(definition.label, overlay.parameterKey);
				});
			if (definitionIt == stateIt->parameterDefinitions.end())
				continue;

			if (definitionIt->type == ShaderParameterType::Trigger)
			{
				if (pendingOscRouteKeys.find(item.first) == pendingOscRouteKeys.end())
					continue;

				ShaderParameterValue& value = stateIt->parameterValues[definitionIt->id];
				const double previousCount = value.numberValues.empty() ? 0.0 : value.numberValues[0];
				const double triggerTime = stateIt->timeSeconds;
				value.numberValues = { previousCount + 1.0, triggerTime };
				overlayKeysToRemove.push_back(item.first);
				continue;
			}

			ShaderParameterValue targetValue;
			std::string normalizeError;
			if (!NormalizeAndValidateParameterValue(*definitionIt, overlay.targetValue, targetValue, normalizeError))
				continue;

			const bool smoothable =
				smoothing > 0.0 &&
				(definitionIt->type == ShaderParameterType::Float ||
					definitionIt->type == ShaderParameterType::Vec2 ||
					definitionIt->type == ShaderParameterType::Color);
			if (!smoothable)
			{
				overlay.currentValue = targetValue;
				overlay.hasCurrentValue = true;
				stateIt->parameterValues[definitionIt->id] = overlay.currentValue;
				if (allowCommit &&
					!overlay.commitQueued &&
					oscNow - overlay.lastUpdatedTime >= kOscOverlayCommitDelay &&
					mRuntimeServices)
				{
					std::string commitError;
					if (mRuntimeServices->QueueOscCommit(item.first, overlay.layerKey, overlay.parameterKey, overlay.targetValue, overlay.generation, commitError))
					{
						overlay.pendingCommitGeneration = overlay.generation;
						overlay.commitQueued = true;
					}
				}
				continue;
			}

			if (!overlay.hasCurrentValue)
			{
				overlay.currentValue = DefaultValueForDefinition(*definitionIt);
				auto currentIt = stateIt->parameterValues.find(definitionIt->id);
				if (currentIt != stateIt->parameterValues.end())
					overlay.currentValue = currentIt->second;
				overlay.hasCurrentValue = true;
			}

			if (overlay.currentValue.numberValues.size() != targetValue.numberValues.size())
				overlay.currentValue.numberValues = targetValue.numberValues;

			double smoothingAlpha = smoothing;
			if (overlay.lastAppliedTime != std::chrono::steady_clock::time_point())
			{
				const double deltaSeconds =
					std::chrono::duration_cast<std::chrono::duration<double>>(oscNow - overlay.lastAppliedTime).count();
				smoothingAlpha = ComputeTimeBasedOscAlpha(smoothing, deltaSeconds);
			}
			overlay.lastAppliedTime = oscNow;

			ShaderParameterValue nextValue = targetValue;
			bool converged = true;
			for (std::size_t index = 0; index < targetValue.numberValues.size(); ++index)
			{
				const double currentNumber = overlay.currentValue.numberValues[index];
				const double targetNumber = targetValue.numberValues[index];
				const double delta = targetNumber - currentNumber;
				double nextNumber = currentNumber + delta * smoothingAlpha;
				if (std::fabs(delta) <= 0.0005)
					nextNumber = targetNumber;
				else
					converged = false;
				nextValue.numberValues[index] = nextNumber;
			}

			if (converged)
				nextValue.numberValues = targetValue.numberValues;

			overlay.currentValue = nextValue;
			overlay.hasCurrentValue = true;
			stateIt->parameterValues[definitionIt->id] = overlay.currentValue;
			if (allowCommit &&
				converged &&
				!overlay.commitQueued &&
				oscNow - overlay.lastUpdatedTime >= kOscOverlayCommitDelay &&
				mRuntimeServices)
			{
				std::string commitError;
				JsonValue committedValue = BuildOscCommitValue(*definitionIt, overlay.currentValue);
				if (mRuntimeServices->QueueOscCommit(item.first, overlay.layerKey, overlay.parameterKey, committedValue, overlay.generation, commitError))
				{
					overlay.pendingCommitGeneration = overlay.generation;
					overlay.commitQueued = true;
				}
			}
		}

		for (const std::string& overlayKey : overlayKeysToRemove)
			mOscOverlayStates.erase(overlayKey);
	};

	const bool hasInputSource = mVideoBackend->HasInputSource();
	std::vector<RuntimeRenderState> layerStates;
	mRenderEngine->ResolveRenderLayerStates(
		mUseCommittedLayerStates.load(),
		mVideoBackend->InputFrameWidth(),
		mVideoBackend->InputFrameHeight(),
		applyOscOverlays,
		layerStates);
	const unsigned historyCap = mRuntimeStore ? mRuntimeStore->GetConfiguredMaxTemporalHistoryFrames() : 0;
	mRenderEngine->RenderLayerStack(
		hasInputSource,
		layerStates,
		mVideoBackend->InputFrameWidth(),
		mVideoBackend->InputFrameHeight(),
		mVideoBackend->CaptureTextureWidth(),
		mVideoBackend->InputPixelFormat(),
		historyCap);
}

void OpenGLComposite::ProcessScreenshotRequest()
{
	if (!mScreenshotRequested.exchange(false))
		return;

	const unsigned width = mVideoBackend ? mVideoBackend->OutputFrameWidth() : 0;
	const unsigned height = mVideoBackend ? mVideoBackend->OutputFrameHeight() : 0;
	if (width == 0 || height == 0)
		return;

	std::vector<unsigned char> topDownPixels;
	if (!mRenderEngine->CaptureOutputFrameRgbaTopDown(width, height, topDownPixels))
		return;

	try
	{
		const std::filesystem::path outputPath = BuildScreenshotPath();
		std::filesystem::create_directories(outputPath.parent_path());
		WritePngFileAsync(outputPath, width, height, std::move(topDownPixels));
	}
	catch (const std::exception& exception)
	{
		OutputDebugStringA((std::string("Screenshot request failed: ") + exception.what() + "\n").c_str());
	}
}

std::filesystem::path OpenGLComposite::BuildScreenshotPath() const
{
	const std::filesystem::path root = mRuntimeStore && !mRuntimeStore->GetRuntimeDataRoot().empty()
		? mRuntimeStore->GetRuntimeDataRoot()
		: std::filesystem::current_path();

	const auto now = std::chrono::system_clock::now();
	const auto milliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()) % 1000;
	const std::time_t nowTime = std::chrono::system_clock::to_time_t(now);
	std::tm localTime = {};
	localtime_s(&localTime, &nowTime);

	std::ostringstream filename;
	filename << "video-shader-toys-"
		<< std::put_time(&localTime, "%Y%m%d-%H%M%S")
		<< "-" << std::setw(3) << std::setfill('0') << milliseconds.count()
		<< ".png";

	return root / "screenshots" / filename.str();
}

bool OpenGLComposite::ProcessRuntimePollResults()
{
	if (!mRuntimeServices)
		return true;

	const RuntimePollEvents events = mRuntimeServices->ConsumePollEvents();
	if (events.failed)
	{
		ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->HandleRuntimePollFailure(events.error));
		return false;
	}

	if (events.registryChanged)
		broadcastRuntimeState();

	if (!events.reloadRequested)
	{
		PreparedShaderBuild readyBuild;
		if (!mShaderBuildQueue || !mShaderBuildQueue->TryConsumeReadyBuild(readyBuild))
			return true;

		char compilerErrorMessage[1024] = {};
		if (!mRenderEngine->ApplyPreparedShaderBuild(
			readyBuild,
			mVideoBackend->InputFrameWidth(),
			mVideoBackend->InputFrameHeight(),
			mRuntimeCoordinator && mRuntimeCoordinator->PreserveFeedbackOnNextShaderBuild(),
			sizeof(compilerErrorMessage),
			compilerErrorMessage))
		{
			ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->HandlePreparedShaderBuildFailure(compilerErrorMessage));
			return false;
		}

		ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->HandlePreparedShaderBuildSuccess());
		return true;
	}

	ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->HandleRuntimeReloadRequest());
	return true;
}

void OpenGLComposite::RequestShaderBuild()
{
	if (!mShaderBuildQueue || !mVideoBackend)
		return;

	mShaderBuildQueue->RequestBuild(mVideoBackend->InputFrameWidth(), mVideoBackend->InputFrameHeight());
}

bool OpenGLComposite::ApplyRuntimeCoordinatorResult(const RuntimeCoordinatorResult& result, std::string* error)
{
	if (!result.accepted)
	{
		if (error)
			*error = result.errorMessage;
		return false;
	}

	if (result.compileStatusChanged && mRuntimeStore)
		mRuntimeStore->SetCompileStatus(result.compileStatusSucceeded, result.compileStatusMessage);

	if (result.clearReloadRequest && mRuntimeStore)
		mRuntimeStore->ClearReloadRequest();

	switch (result.committedStateMode)
	{
	case RuntimeCoordinatorCommittedStateMode::UseCommittedStates:
		mUseCommittedLayerStates = true;
		break;
	case RuntimeCoordinatorCommittedStateMode::UseLiveSnapshots:
		mUseCommittedLayerStates = false;
		break;
	case RuntimeCoordinatorCommittedStateMode::Unchanged:
	default:
		break;
	}

	if (result.clearTransientOscState)
	{
		mOscOverlayStates.clear();
		if (mRuntimeServices)
			mRuntimeServices->ClearOscState();
	}

	ApplyRuntimeCoordinatorRenderReset(result.renderResetScope);

	if (result.shaderBuildRequested)
		RequestShaderBuild();

	if (result.runtimeStateBroadcastRequired)
		broadcastRuntimeState();

	return true;
}

void OpenGLComposite::ApplyRuntimeCoordinatorRenderReset(RuntimeCoordinatorRenderResetScope resetScope)
{
	if (!mRenderEngine)
		return;

	switch (resetScope)
	{
	case RuntimeCoordinatorRenderResetScope::TemporalHistoryOnly:
		mRenderEngine->ResetTemporalHistoryState();
		break;
	case RuntimeCoordinatorRenderResetScope::TemporalHistoryAndFeedback:
		mRenderEngine->ResetTemporalHistoryState();
		mRenderEngine->ResetShaderFeedbackState();
		break;
	case RuntimeCoordinatorRenderResetScope::None:
	default:
		break;
	}
}

void OpenGLComposite::broadcastRuntimeState()
{
	if (mRuntimeServices)
		mRuntimeServices->BroadcastState();
}

bool OpenGLComposite::CheckOpenGLExtensions()
{
	return true;
}

////////////////////////////////////////////