Mikkel Gjoel pixelmager

Use cases

a tool like colorcop, but with the purpose of inspecting pixels, rather than picking colors.

analysis

	1) : VPOS not supported for pixel-position in fragment program
	NOT FUNCTIONAL workaround: (see https://gist.github.com/aras-p/8e0c061d4e2490c1f8e2 )
	#if defined(SHADER_API_D3D11)
	#define VPOS_TYPE float4
	#define VPOS_SEM WPOS
	#else
	#define VPOS_TYPE float2
	#define VPOS_SEM VPOS
	#endif
	half4 frag( v2f IN, VPOS_TYPE in_vpos : VPOS_SEM ) : COLOR

	sampler2D _CameraNormalsTexture;
	float4x4 _CameraToWorld;

	v2f vert (appdata v)
	{
	v2f o;
	o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
	o.uv = ComputeScreenPos (o.pos);
	o.ray = mul (UNITY_MATRIX_MV, v.vertex).xyz * float3(-1,-1,1);

	Oh hey, they updated the physics-engiOMG-EVERYTHING-IS-BROKEN!!1

	To match look of u4:
	- disable all light-baking
	- disable auto-patching shaders with fog (and switch fog back to whatever mode you were using)
	- set Light Bounce to 0 on all lights... or you'll get a warning!1 (on every spot-light)

	- Light-shaders are now overridden explicitly in the Lighting-tab
	...all other shaders still override automagically... :p

	Overview
	* http://behindthepixels.io/assets/files/TemporalAA.pdf
	* https://www.highperformancegraphics.org/wp-content/uploads/2017/Retrospective/HPG2017_Jimenez_MLAARetrospective.pdf

	UE4
	* http://advances.realtimerendering.com/s2014/epic/TemporalAA.pptx

	INSIDE
	* https://github.com/playdeadgames/temporal/blob/master/GDC2016_Temporal_Reprojection_AA_INSIDE.pdf

	soft intro
	https://developer.nvidia.com/preparing-real-hdr
	https://developer.nvidia.com/getting-know-new-hdr
	http://wccftech.com/nvidia-pascal-goes-full-in-with-hdr-support-for-games-and-4k-streaming-for-movies/

	implementation
	https://developer.nvidia.com/sites/default/files/akamai/gameworks/hdr/UHDColorForGames.pdf
	http://on-demand.gputechconf.com/siggraph/2016/presentation/sig1611-thomas-true-high-dynamic-range-rendering-displays.pdf
	https://developer.nvidia.com/displaying-hdr-nuts-and-bolts
	https://developer.nvidia.com/implementing-hdr-rise-tomb-raider

	if ( DoHDRscreenshot )
	{
	DoHDRscreenshot = false;

	int w = source.width;
	int h = source.height;

	RenderTexture rt_hdr = RenderTexture.GetTemporary( w, h, 0, RenderTextureFormat.ARGBHalf );

	Finalpass( source, rt_hdr, bloom_rt, distortion_rt, distparms ); //note: final posteffects pass