/**
 * @ Version: SCREEN SPACE SHADERS - UPDATE 22
 * @ Description: Rain - Create refraction buffer without rain ( Buffer at 1/8 res )
 * @ Modified time: 2024-11-19 22:16
 * @ Author: https://www.moddb.com/members/ascii1457
 * @ Mod: https://www.moddb.com/mods/stalker-anomaly/addons/screen-space-shaders
 */

#include "screenspace_common.h"

Texture2D ssfx_color_buffer;
Texture2D volumetric_buffer;

float4 main(p_screen I) : SV_Target
{

	float2 HalfPixel = (1.0f / (screen_res.xy / 8.0f)) * 2.0;

	const float2 Coords[4] = {
		float2( -HalfPixel.x,  HalfPixel.y ),
		float2(  HalfPixel.x,  HalfPixel.y ),
		float2(  HalfPixel.x, -HalfPixel.y ),
		float2( -HalfPixel.x, -HalfPixel.y )
	};

	float3 Color = ssfx_color_buffer.Sample( smp_rtlinear, I.tc0 ).rgb * 4.0f;

	for( int x = 0; x < 4; x++ )
	{
		Color += ssfx_color_buffer.Sample( smp_rtlinear, I.tc0 + Coords[x] ).rgb;
	}

	Color = Color / 8.0f;

	// Apply volumetric
	float3 Vol = volumetric_buffer.Sample( smp_rtlinear, I.tc0 ).rgb * 5.0f;
	Vol *= 1.0f / (2.0f + Vol);
	Vol *= 1.0f - saturate(dot(Vol, 1));

	return float4(Color + Vol, 1.0f);
}