unity_native_render_plugin/NativeRenderPlugin/RenderAPI.h

#pragma once

#include "Unity/IUnityGraphics.h"

#include <array>

struct IUnityInterfaces;

enum GraphicsFeature
{
	VRS_DRAW = 0,
	VRS_PRIMITIVE,
	VRS_ATTACHMENT,
	HW_SPATIAL_SR,
	HW_AISR,
	HW_ADAPTIVE_VRS,
	HW_FG_INTERPOLATE,
	HW_FG_EXTRAPOLATION,
	METAL_FX_SPATIAL_SR,
	METAL_FX_TEMPORAL_SR,
	VIVO_TEMPORAL_SR,
	QCOM_AFME,
	XESS13,
	MAX_CNT
};

struct SupportFeatureList
{
	std::array<bool, GraphicsFeature::MAX_CNT> support_features = {0};

	bool& operator[](GraphicsFeature feature)
	{
		return support_features[(int)feature];
	}
};

struct AFMEParam
{
    void* src;
    void* data;
    void* dst;
};

// Super-simple "graphics abstraction". This is nothing like how a proper platform abstraction layer would look like;
// all this does is a base interface for whatever our plugin sample needs. Which is only "draw some triangles"
// and "modify a texture" at this point.
//
// There are implementations of this base class for D3D9, D3D11, OpenGL etc.; see individual RenderAPI_* files.
class RenderAPI
{
public:
	virtual ~RenderAPI() { }

	// Process general event like initialization, shutdown, device loss/reset etc.
	virtual void processDeviceEvent(UnityGfxDeviceEventType type, IUnityInterfaces* interfaces) = 0;

	// Is the API using "reversed" (1.0 at near plane, 0.0 at far plane) depth buffer?
	// Reversed Z is used on modern platforms, and improves depth buffer precision.
	virtual bool getUsesReverseZ() = 0;


	// Sets the underlying resource to unity RenderBuffer 
	// see https://docs.unity3d.com/ScriptReference/RenderBuffer.html
	// setting rb to nullptr is used to signal the plugin that the 
	// previously set RenderBuffer is no longer valid
	virtual void setRenderTextureResource(UnityRenderBuffer rb) {}

	// This should return true when the plugin is used with the unity player
	// and false when the editor is used. The editor uses multiple swap
	// chains (for each window) so instead of choosing one of them nullptr is returned.
	virtual bool isSwapChainAvailable() { return false; };

	// These require the swap chain to be available to be functional.
	// When the swap chain is not available these simply return 0

	virtual unsigned int getPresentFlags() { return 0; }
	virtual unsigned int getSyncInterval() { return 0; }
	virtual unsigned int getBackbufferWidth() { return 0; }
	virtual unsigned int getBackbufferHeight() { return 0; }

	virtual void enableVRS(int vrsEnum) {}
	virtual void disableVRS() {}

	virtual void enableFGExtrapolation(void* data) {}
	virtual void preFGExtrapolation() {}
	// when renturn true present dst, data may matriaxs or texture
	virtual bool doFGExtrapolation(void* src, void* data, void* dst) { return false;}
	virtual void postFGExtrapolation() {}
	virtual void disableFGExtrapolation() {}

	virtual void spatialUpScale(void* data) {}

	virtual bool getFeatureSupport(GraphicsFeature feature);

	virtual void enableXESS1(void* data) {}
	virtual void doXESS1(void* data) {}
	virtual void configXESS1(void* data) {}
	virtual void disableXESS1() {}

	virtual bool getInputResolution(uint32_t outw, uint32_t outh, int quality, uint32_t& width, uint32_t& height) { return false; }
protected:
	virtual void initSupportFeature() = 0;

	SupportFeatureList support_features;
};


// Create a graphics API implementation instance for the given API type.
RenderAPI* createRenderAPI(UnityGfxRenderer apiType);