atdunbg
6c80693618
TAA subpixel jitter makes rasterized HDR specular highlights oscillate per frame. The old RGB min/max neighborhood clamp re-clamped the converged history against jitter-driven extremes every frame, leaving a periodic residual that the bloom threshold then amplified into visible glow pulsing on static models. - TAA: replace the RGB AABB clamp with YCoCg variance clipping (history clamped toward the stable neighborhood mean +/- 1.25 sigma, intersected with the min/max box as a ghosting upper bound) - Bloom extract: 5-tap cross prefilter before the threshold spreads surviving 1px jitter energy over a ~4x4 footprint so the glow no longer pulses
35 lines
1.4 KiB
GLSL
35 lines
1.4 KiB
GLSL
#version 450
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// Bloom 提取：从 HDR 颜色图中滤出超过阈值的部分（软阈值，保留超出比例）。
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// 全屏 pass 通用 push（16B）：param0 = 亮度阈值（HDR 域，1.0 = 仅高光溢出）。
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layout(location = 0) in vec2 fragUV;
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layout(location = 0) out vec4 outColor;
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layout(set = 0, binding = 0) uniform sampler2D hdrImage;
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layout(push_constant) uniform PushConstants {
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float exposure; // 未用（程序级统一布局）
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float threshold; // param0
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float _pad0;
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float _pad1;
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} pc;
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void main() {
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// 5 tap 十字预滤波（中心 0.4 + 四邻 0.15）：TAA 残留的亚像素震荡
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// 在进阈值前被抹平——1px 级抖动的能量摊到 ~4×4 足印，泛光不再脉冲。
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// 半分辨率输出中心的双线性已覆盖 2×2 块，此步把足印扩到近似 4×4
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vec2 ts = 1.0 / vec2(textureSize(hdrImage, 0));
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vec3 c = texture(hdrImage, fragUV).rgb * 0.4
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+ (texture(hdrImage, fragUV + vec2(ts.x, 0.0)).rgb
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+ texture(hdrImage, fragUV + vec2(-ts.x, 0.0)).rgb
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+ texture(hdrImage, fragUV + vec2(0.0, ts.y)).rgb
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+ texture(hdrImage, fragUV + vec2(0.0, -ts.y)).rgb) * 0.15;
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float l = max(c.r, max(c.g, c.b));
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// 软阈值：只保留超出 threshold 的能量比例，避免硬切产生的块状边缘
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float k = max(l - pc.threshold, 0.0) / max(l, 1e-4);
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outColor = vec4(c * k, 1.0);
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}
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