// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

/*=============================================================================
	PostProcessBokehDOF.usf: PostProcessing Lens Flares.
=============================================================================*/

#include "Common.usf"
#include "PostProcessCommon.usf"
#include "DepthOfFieldCommon.usf"
#include "MiniFontCommon.usf"		// for PrintFloat()
#include "CircleDOFCommon.usf"

// for the BokehDOF vertex shader, from postprocessing settings
// .x: color threshold, .y:size threshold, zw: unused
float4 DepthOfFieldThresholds;

// .xy:tilecount, .zw:tilesize
uint4 TileCountAndSize;
// .xy:size in pixels, .zw:LeftTop of the original viewport in rendertaregt scaled coordiantes
float4 KernelSize;

// for VisualizeDOF only
int2 CursorPos;

// for VisualizeDOF [0]:near, [1]:far
float4 VisualizeColors[2];

// render in fullres to visualize the half res DOF input from the setup pass
void VisualizeDOFPS(in noperspective float4 UVAndScreenPos : TEXCOORD0,
	float4 SvPosition : SV_POSITION,
	out float4 OutColor : SV_Target0)
{
	OutColor = 0;

	float2 UV = UVAndScreenPos.xy; 
	int2 PixelPos = (int2)SvPosition.xy;
	float2 ViewLocalUV = float2(UVAndScreenPos.z * 0.5f + 0.5f, 0.5f - 0.5f * UVAndScreenPos.w);
	
	float SceneDepth = CalcSceneDepth(UV);

	// 0..1
	half Near = CalcUnfocusedPercentCustomBound(SceneDepth, 1, 0);
	// 0..1
	half Far = CalcUnfocusedPercentCustomBound(SceneDepth, 0, 1);

	OutColor.rgb = lerp(OutColor.rgb, VisualizeColors[0].rgb, Near);
	OutColor.rgb = lerp(OutColor.rgb, VisualizeColors[1].rgb, Far);
	
	half3 SceneColor = Texture2DSample(PostprocessInput0, PostprocessInput0Sampler, UV).rgb;

	// blend in a bit of the scene color to make navigation easier
	OutColor.rgb = lerp(saturate(OutColor.rgb), Luminance(SceneColor), 0.1f);

	// draw a crosshair
	{
		float CrossHairMask = PixelPos.x == CursorPos.x || PixelPos.y == CursorPos.y;
		float2 DistAbs = abs(PixelPos - CursorPos);
		float Dist = max(DistAbs.x, DistAbs.y);
		float DistMask = Dist >= 12;

		OutColor.xyz = lerp(OutColor.xyz, float3(1, 1, 1), CrossHairMask * DistMask * 0.1f);
	}

	// value under crosshair
	{
		float SceneDepthAtCursor = CalcSceneDepth(CursorPos * PostprocessInput0Size.zw);

		// DepthToCoc is half res do we multiply by 2, sign is used to identigy near/far wehich we don't need here
		float CoCInPixel = abs(DepthToCoc(SceneDepthAtCursor)) * 2.0f;

		// draw a circle
		{
			float Dist = length(PixelPos - CursorPos);
			
			float Mask = saturate(1 - abs(CoCInPixel - Dist));

			OutColor.xyz = lerp(OutColor.xyz, float3(1, 1, 1), Mask);
		}
		
		int2 PrintCursor = CursorPos + int2(28, 7 + 0 * 8);

		{
			int2 LeftTop = PrintCursor - int2(11, 0);
			PrintCharacter(PixelPos, OutColor.xyz, float3(1, 1, 1), LeftTop, _D_);
		}
		PrintFloatNoFraction(PixelPos, OutColor.xyz, float3(1, 1, 1) * 0.6f, PrintCursor, SceneDepthAtCursor);
		PrintCursor.y += 16;
		{
			int2 LeftTop = PrintCursor - int2(11, 0);
			PrintCharacter(PixelPos, OutColor.xyz, float3(1, 1, 1), LeftTop, _R_);
		}
		PrintFloat(PixelPos, OutColor.xyz, float3(1, 1, 1)*0.6, PrintCursor, CoCInPixel);
	}
}