overte-Armored-Dragon/libraries/render-utils/src/taa.slf

<@include gpu/Config.slh@>
<$VERSION_HEADER$>
// <$_SCRIBE_FILENAME$>
// Generated on <$_SCRIBE_DATE$>
//
//  Created by Sam Gateau on 8/14/2017
//  Copyright 2017 High Fidelity, Inc.
//  Copyright 2024 Overte e.V.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//


<@include taa.slh@>

layout(location=0) in vec2 varTexCoord0;
layout(location=0) out vec4 outFragColor;

void main() {
    vec2 fragUV = varTexCoord0;

    // Debug region before debug or fxaa region X
    float distToRegionFXAA = fragUV.x - taa_getRegionFXAA().x;  
    if (distToRegionFXAA > 0.0) {
        outFragColor = vec4(taa_evalFXAA(fragUV), 1.0);
        return;
    }

    vec4 sourceColor;
    vec4 historyColor;

    vec2 fragVel = taa_fetchVelocityMapBest(fragUV).xy;
    bool needsTAA = taa_fetchSourceAndHistory(fragUV, fragVel, sourceColor, historyColor);
    vec4 nextColor = sourceColor;
    if (needsTAA) {
        // clamp history to neighbourhood of current sample
        historyColor.rgb = mix(historyColor.rgb, taa_evalConstrainColor(sourceColor.rgb, fragUV, fragVel, historyColor.rgb).rgb, float(taa_constrainColor()));

        if (taa_feedbackColor()) {
            nextColor = taa_evalFeedbackColor(sourceColor, historyColor, params.blend);
        } else {
            nextColor = mix(historyColor, sourceColor, params.blend);
        }

        nextColor.rgb = taa_resolveColor(mix(sourceColor.rgb, nextColor.rgb, nextColor.a));
    }

    outFragColor = nextColor;
}