--User changes

-Add support for multiple GPU devices.
  --These options are present in the command line and in Fractorium.
 -Change scheme of specifying devices from platform,device to just total device index.
  --Single number on the command line.
  --Change from combo boxes for device selection to a table of all devices in Fractorium.
 -Temporal samples defaults to 100 instead of 1000 which was needless overkill.

--Bug fixes
 -EmberAnimate, EmberRender, FractoriumSettings, FinalRenderDialog: Fix wrong order of arguments to Clamp() when assigning thread priority.
 -VariationsDC.h: Fix NVidia OpenCL compilation error in DCTriangleVariation.
 -FractoriumXformsColor.cpp: Checking for null pixmap pointer is not enough, must also check if the underlying buffer is null via call to QPixmap::isNull().

--Code changes
 -Ember.h: Add case for FLAME_MOTION_NONE and default in ApplyFlameMotion().
 -EmberMotion.h: Call base constructor.
 -EmberPch.h: #pragma once only on Windows.
 -EmberToXml.h:
  --Handle different types of exceptions.
  --Add default cases to ToString().
 -Isaac.h: Remove unused variable in constructor.
 -Point.h: Call base constructor in Color().
 -Renderer.h/cpp:
  --Add bool to Alloc() to only allocate memory for the histogram. Needed for multi-GPU.
  --Make CoordMap() return a const ref, not a pointer.
 -SheepTools.h:
  --Use 64-bit types like the rest of the code already does.
  --Fix some comment misspellings.
 -Timing.h: Make BeginTime(), EndTime(), ElapsedTime() and Format() be const functions.
 -Utils.h:
  --Add new functions Equal() and Split().
  --Handle more exception types in ReadFile().
  --Get rid of most legacy blending of C and C++ argument parsing.
 -XmlToEmber.h:
  --Get rid of most legacy blending of C and C++ code from flam3.
  --Remove some unused variables.
 -EmberAnimate:
  --Support multi-GPU processing that alternates full frames between devices.
  --Use OpenCLInfo instead of OpenCLWrapper for --openclinfo option.
  --Remove bucketT template parameter, and hard code float in its place.
  --If a render fails, exit since there is no point in continuing an animation with a missing frame.
  --Pass variables to threaded save better, which most likely fixes a very subtle bug that existed before.
  --Remove some unused variables.
 -EmberGenome, EmberRender:
  --Support multi-GPU processing that alternates full frames between devices.
  --Use OpenCLInfo instead of OpenCLWrapper for --openclinfo option.
  --Remove bucketT template parameter, and hard code float in its place.
 -EmberRender:
  --Support multi-GPU processing that alternates full frames between devices.
  --Use OpenCLInfo instead of OpenCLWrapper for --openclinfo option.
  --Remove bucketT template parameter, and hard code float in its place.
  --Only print values when not rendering with OpenCL, since they're always 0 in that case.
 -EmberCLPch.h:
  --#pragma once only on Windows.
  --#include <atomic>.
 -IterOpenCLKernelCreator.h: Add new kernel for summing two histograms. This is needed for multi-GPU.
 -OpenCLWrapper.h:
  --Move all OpenCL info related code into its own class OpenCLInfo.
  --Add members to cache the values of global memory size and max allocation size.
 -RendererCL.h/cpp:
  --Redesign to accomodate multi-GPU.
  --Constructor now takes a vector of devices.
  --Remove DumpErrorReport() function, it's handled in the base.
  --ClearBuffer(), ReadPoints(), WritePoints(), ReadHist() and WriteHist() now optionally take a device index as a parameter.
  --MakeDmap() override and m_DmapCL member removed because it no longer applies since the histogram is always float since the last commit.
  --Add new function SumDeviceHist() to sum histograms from two devices by first copying to a temporary on the host, then a temporary on the device, then summing.
  --m_Calls member removed, as it's now per-device.
  --OpenCLWrapper removed.
  --m_Seeds member is now a vector of vector of seeds, to accomodate a separate and different array of seeds for each device.
  --Added member m_Devices, a vector of unique_ptr of RendererCLDevice.
 -EmberCommon.h
  --Added Devices() function to convert from a vector of device indices to a vector of platform,device indices.
  --Changed CreateRenderer() to accept a vector of devices to create a single RendererCL which will split work across multiple devices.
  --Added CreateRenderers() function to accept a vector of devices to create multiple RendererCL, each which will render on a single device.
  --Add more comments to some existing functions.
 -EmberCommonPch.h: #pragma once only on Windows.
 -EmberOptions.h:
  --Remove --platform option, it's just sequential device number now with the --device option.
  --Make --out be OPT_USE_RENDER instead of OPT_RENDER_ANIM since it's an error condition when animating. It makes no sense to write all frames to a single image.
  --Add Devices() function to parse comma separated --device option string and return a vector of device indices.
  --Make int and uint types be 64-bit, so intmax_t and size_t.
  --Make better use of macros.
 -JpegUtils.h: Make string parameters to WriteJpeg() and WritePng() be const ref.
 -All project files: Turn off buffer security check option in Visual Studio (/Gs-)
 -deployment.pri: Remove the line OTHER_FILES +=, it's pointless and was causing problems.
 -Ember.pro, EmberCL.pro: Add CONFIG += plugin, otherwise it wouldn't link.
 -EmberCL.pro: Add new files for multi-GPU support.
 -build_all.sh: use -j4 and QMAKE=${QMAKE:/usr/bin/qmake}
 -shared_settings.pri:
  -Add version string.
  -Remove old DESTDIR definitions.
  -Add the following lines or else nothing would build:
   CONFIG(release, debug|release) {
    CONFIG += warn_off
    DESTDIR = ../../../Bin/release
   }

   CONFIG(debug, debug|release) {
    DESTDIR = ../../../Bin/debug
   }

   QMAKE_POST_LINK += $$quote(cp --update ../../../Data/flam3-palettes.xml $${DESTDIR}$$escape_expand(\n\t))
   LIBS += -L/usr/lib -lpthread
 -AboutDialog.ui: Another futile attempt to make it look correct on Linux.
 -FinalRenderDialog.h/cpp:
  --Add support for multi-GPU.
  --Change from combo boxes for device selection to a table of all devices.
  --Ensure device selection makes sense.
  --Remove "FinalRender" prefix of various function names, it's implied given the context.
 -FinalRenderEmberController.h/cpp:
  --Add support for multi-GPU.
  --Change m_FinishedImageCount to be atomic.
  --Move CancelRender() from the base to FinalRenderEmberController<T>.
  --Refactor RenderComplete() to omit any progress related functionality or image saving since it can be potentially ran in a thread.
  --Consolidate setting various renderer fields into SyncGuiToRenderer().
 -Fractorium.cpp: Allow for resizing of the options dialog to show the entire device table.
 -FractoriumCommon.h: Add various functions to handle a table showing the available OpenCL devices on the system.
 -FractoriumEmberController.h/cpp: Remove m_FinalImageIndex, it's no longer needed.
 -FractoriumRender.cpp: Scale the interactive sub batch count and quality by the number of devices used.
 -FractoriumSettings.h/cpp:
  --Temporal samples defaults to 100 instead of 1000 which was needless overkill.
  --Add multi-GPU support, remove old device,platform pair.
 -FractoriumToolbar.cpp: Disable OpenCL toolbar button if there are no devices present on the system.
 -FractoriumOptionsDialog.h/cpp:
  --Add support for multi-GPU.
  --Consolidate more assignments in DataToGui().
  --Enable/disable CPU/OpenCL items in response to OpenCL checkbox event.
 -Misc: Convert almost everything to size_t for unsigned, intmax_t for signed.

Source/Fractorium/FinalRenderEmberController.h

@@ -35,8 +35,7 @@ struct FinalRenderGuiState
 	QString m_Ext;
 	QString m_Prefix;
 	QString m_Suffix;
-	uint m_PlatformIndex;
-	uint m_DeviceIndex;
+	QList<QVariant> m_Devices;
 	uint m_ThreadCount;
 	int m_ThreadPriority;
 	double m_WidthScale;
@@ -68,16 +67,16 @@ public:
 	virtual tuple<size_t, size_t, size_t> SyncAndComputeMemory() { return tuple<size_t, size_t, size_t>(0, 0, 0); }
 	virtual double OriginalAspect() { return 1; }
 	virtual QString ComposePath(const QString& name) { return ""; }
+	virtual void CancelRender() { }
 
-	void CancelRender();
 	bool CreateRendererFromGUI();
 	void Output(const QString& s);
 
 protected:
 	bool m_Run;
 	bool m_PreviewRun;
-	uint m_ImageCount;
-	uint m_FinishedImageCount;
+	size_t m_ImageCount;
+	std::atomic<size_t> m_FinishedImageCount;
 
 	QFuture<void> m_Result;
 	QFuture<void> m_FinalPreviewResult;
@@ -87,15 +86,14 @@ protected:
 	FractoriumSettings* m_Settings;
 	FractoriumFinalRenderDialog* m_FinalRenderDialog;
 	FinalRenderGuiState m_GuiState;
-	OpenCLWrapper m_Wrapper;
-	CriticalSection m_PreviewCs;
+	CriticalSection m_PreviewCs, m_ProgressCs;
 	Timing m_RenderTimer;
 	Timing m_TotalTimer;
 };
 
 /// <summary>
 /// Templated derived class which implements all interaction functionality between the embers
-/// of a specific template type and the final render dialog;
+/// of a specific template type and the final render dialog.
 /// </summary>
 template<typename T>
 class FinalRenderEmberController : public FinalRenderEmberControllerBase
@@ -113,7 +111,7 @@ public:
 #endif
 	virtual void SetEmber(size_t index) override;
 	virtual bool Render() override;
-	virtual bool CreateRenderer(eRendererType renderType, uint platform, uint device, bool shared = true) override;
+	virtual bool CreateRenderer(eRendererType renderType, const vector<pair<size_t, size_t>>& devices, bool shared = true) override;
 	virtual int ProgressFunc(Ember<T>& ember, void* foo, double fraction, int stage, double etaMs) override;
 	virtual size_t Index() const override { return m_Ember->m_Index; }
 	virtual uint SizeOfT() const override { return sizeof(T); }
@@ -127,11 +125,20 @@ public:
 	virtual double OriginalAspect() override { return double(m_Ember->m_OrigFinalRasW) / m_Ember->m_OrigFinalRasH; }
 	virtual QString Name() const override { return QString::fromStdString(m_Ember->m_Name); }
 	virtual QString ComposePath(const QString& name) override;
-	
+	virtual void CancelRender() override;
+
+	//Non Virtual functions.
+	EmberNs::Renderer<T, float>* FirstOrDefaultRenderer();
+
 protected:
 	void CancelPreviewRender();
+	void HandleFinishedProgress();
+	void SaveCurrentRender(Ember<T>& ember);
+	void SaveCurrentRender(Ember<T>& ember, const EmberImageComments& comments, vector<byte>& pixels, size_t width, size_t height, size_t channels, size_t bpc);
 	void RenderComplete(Ember<T>& ember);
+	void RenderComplete(Ember<T>& ember, const EmberStats& stats, Timing& renderTimer);
 	void SyncGuiToEmber(Ember<T>& ember, size_t widthOverride = 0, size_t heightOverride = 0);
+	bool SyncGuiToRenderer();
 	void SetProgressComplete(int val);
 
 	Ember<T>* m_Ember;
@@ -139,5 +146,6 @@ protected:
 	EmberFile<T> m_EmberFile;
 	EmberToXml<T> m_XmlWriter;
 	unique_ptr<EmberNs::Renderer<T, float>> m_FinalPreviewRenderer;
+	vector<unique_ptr<EmberNs::Renderer<T, float>>> m_Renderers;
 };