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struct VSOut
{
float4 position : SV_Position;
float2 txcoord: TexCoord;
};
cbuffer globalParams
{
float2 screenSize;
float elapsedTime;
int captureState;
float4 tileUV;
}
cbuffer controlBuf
{
float g_sldGamma;
float g_sldExposure;
float g_sldContrast;
float g_sldVign;
float g_sldFilterStrength;
float g_sldScratchesStrength;
}
Texture2D texColor;
Texture2D texScratches;
SamplerState samLinear;
SamplerState samLinearWrap;
float4 PSMain( VSOut IN ): SV_Target
{
float GlobalExposure = g_sldExposure;
float GlobalGamma = lerp(0.4, 0.01, g_sldGamma);
float GlobalContrast = g_sldContrast;
float TintIntensity = -2.0 * g_sldFilterStrength;
float BlackLevel = 0.16;
float VignetteStrength = g_sldVign * 8.0;
float4 color = texColor.Sample(samLinear, IN.txcoord.xy);
color.rgb *= 0.33;
color.rgb = lerp(color.rgb,dot(color.rgb,float3(0.299,0.587,0.114)), g_sldFilterStrength);
color.rgb = pow(color.rgb,lerp(3.0,1.0,color.rgb)) * 4.5;
color.rgb *= GlobalExposure * 1.1;
color.rgb = pow(color.rgb,GlobalGamma * 0.9);
color.rgb = lerp(color.rgb,color.rgb*color.rgb*(3-2*color.rgb), GlobalContrast);
color.rgb *= lerp(1.0,float3(0,0.42,1.28),0.1 * TintIntensity * saturate(1-dot(color.rgb,0.333)));
float2 vigncoord = IN.txcoord.xy-0.5;
float vignamount = dot(vigncoord,vigncoord);
color.rgb *= lerp(1.0,0.0,saturate((1-dot(color.rgb,0.333))*vignamount*VignetteStrength));
float frames24 = floor(elapsedTime / 83.3);
float2 flipRand, shiftRand;
float channelRand;
//magic numbers for randomization, makes sure the (tileable) textures are shifted and
//flipped randomly (both x and y axis) and the channel is randomly selected, to minimize
//repeating patterns without using tons of external textures
flipRand.x = sin(frames24 * 233.22) > 0;
flipRand.y = sin(frames24 * 122.1 + 0.22) < 0;
shiftRand.x = sin(frames24 * 17.1 - 0.25);
shiftRand.y = sin(frames24 * 23.1 + 4.25);
channelRand = floor(frac(frames24 * 1.618) * 19.0) % 3;
float2 lookupCoord;
lookupCoord = lerp(IN.txcoord.xy, -IN.txcoord.xy, flipRand.xy);
lookupCoord += shiftRand.xy;
float3 scratchesSource = texScratches.Sample(samLinearWrap, lookupCoord.xy).rgb;
float scratchesTex = scratchesSource.x;
if(channelRand == 1) scratchesTex = scratchesSource.y;
if(channelRand == 2) scratchesTex = scratchesSource.z;
scratchesTex = lerp(scratchesTex, 1.0, saturate(1-vignamount*0.8));
scratchesTex = lerp(1.0, scratchesTex, g_sldScratchesStrength * 3.0);
color.rgb *= saturate(scratchesTex);
color.rgb = lerp(saturate(color.rgb),1.0,BlackLevel);
//if(IN.txcoord.x > 0.9) color.rgb = frac(elapsedTime * 0.001);
return color;
}