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#version 330 core
in vec2 UV;
out vec3 color;
uniform sampler2D curFrameSampler;
uniform sampler2D NTSCArtifactSampler;
uniform sampler2D prevFrameSampler;
const float Tuning_Sharp = 0.25;
const vec4 Tuning_Persistence = vec4(1.0) * 0.5;
const float Tuning_Bleed = 0.5;
const float Tuning_NTSC = 0.35;
uniform float NTSCLerp;
const vec2 RcpScrWidth = vec2(1.0f / 320.f, 0.0f);
const vec2 RcpScrHeight = vec2(0.0f, 1.0f / 200.0f);
float Brightness(vec4 InVal)
{
return dot(InVal, vec4(0.299, 0.587, 0.114, 0.0));
}
const float SharpWeight[3] = float[3](1.0, -0.3162277, 0.1);
void main()
{
vec4 NTSCArtifact1 = texture(NTSCArtifactSampler, UV);
vec4 NTSCArtifact2 = texture(NTSCArtifactSampler, UV + RcpScrHeight);
vec4 NTSCArtifact = mix(NTSCArtifact1, NTSCArtifact2, NTSCLerp);
vec4 TunedNTSC = NTSCArtifact * Tuning_NTSC;
vec2 LeftUV = UV - RcpScrWidth;
vec2 RightUV = UV + RcpScrWidth;
vec4 Cur_Left = texture(curFrameSampler, LeftUV);
vec4 Cur_Local = texture(curFrameSampler, UV);
vec4 Cur_Right = texture(curFrameSampler, RightUV);
vec4 Prev_Left = texture(prevFrameSampler, LeftUV);
vec4 Prev_Local = texture(prevFrameSampler, UV);
vec4 Prev_Right = texture(prevFrameSampler, RightUV);
Cur_Local = clamp(Cur_Local + (((Cur_Left - Cur_Local) + (Cur_Right - Cur_Local)) * TunedNTSC), vec4(0,0,0,0), vec4(1,1,1,1));
float curBrt = Brightness(Cur_Local);
float offset = 0;
for (int i=0; i<3; ++i)
{
vec2 StepSize = (RcpScrWidth * float(i+1));
vec4 neighborleft = texture(curFrameSampler, UV - StepSize);
vec4 neighborright = texture(curFrameSampler, UV + StepSize);
float NBrtL = Brightness(neighborleft);
float NBrtR = Brightness(neighborright);
offset += ((curBrt - NBrtL) + (curBrt - NBrtR)) * SharpWeight[i];
}
Cur_Local = clamp(Cur_Local + (offset * Tuning_Sharp * mix(vec4(1,1,1,1), NTSCArtifact, Tuning_NTSC)), vec4(0,0,0,0), vec4(1,1,1,1));
Cur_Local = clamp(max(Cur_Local, Tuning_Persistence * (1.0 / (1.0 + (2.0 * Tuning_Bleed))) * (Prev_Local + ((Prev_Left + Prev_Right) * Tuning_Bleed))), vec4(0,0,0,0), vec4(1,1,1,1));
color = Cur_Local.xyz;
}
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