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Fix foliage DXT black fringe, insect depth occlusion, and ambient creature animation

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- Replace dark edge RGB on alpha-tested foliage with mip-4 average color
  proportional to alpha (low alpha = low trust in original RGB)
- Raise foliage alpha cutoff to 0.4 and remove dither band for cleaner edges
- Disable depth test on insect particles so they don't vanish behind foliage
- Exempt dragonflies/butterflies/moths from foliage animation freeze
This commit is contained in:
Kelsi 2026-02-23 07:34:29 -08:00
parent 01c08b93b0
commit a7102ab742
3 changed files with 17 additions and 18 deletions
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31
assets/shaders/m2.frag.glsl
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@ -66,27 +66,26 @@ void main() {
bool isFoliage = (alphaTest == 2);
// Fix DXT fringe: transparent edge texels have garbage (black) RGB.
// At low alpha the original RGB is untrustworthy — replace with the
// averaged color from nearby opaque texels (high mip). The lower
// the alpha the more we distrust the original color.
if (alphaTest != 0 && texColor.a > 0.01 && texColor.a < 1.0) {
vec3 mipColor = textureLod(uTexture, TexCoord, 4.0).rgb;
// trust = 0 at alpha 0, trust = 1 at alpha ~0.9
float trust = smoothstep(0.0, 0.9, texColor.a);
texColor.rgb = mix(mipColor, texColor.rgb, trust);
}
float alphaCutoff = 0.5;
if (alphaTest == 2) {
// Vegetation cutout: lower threshold to preserve leaf coverage at grazing angles.
alphaCutoff = 0.33;
alphaCutoff = 0.4;
} else if (alphaTest == 3) {
// Ground detail clutter (grass/small cards) needs softer clipping.
alphaCutoff = 0.20;
alphaCutoff = 0.25;
} else if (alphaTest != 0) {
alphaCutoff = 0.35;
alphaCutoff = 0.4;
}
if (alphaTest == 2) {
float alpha = texColor.a;
float softBand = 0.15;
if (alpha < (alphaCutoff - softBand)) discard;
if (alpha < alphaCutoff) {
ivec2 p = ivec2(gl_FragCoord.xy);
float threshold = bayerDither4x4(p);
float keep = clamp((alpha - (alphaCutoff - softBand)) / softBand, 0.0, 1.0);
if (threshold > keep) discard;
}
} else if (alphaTest != 0 && texColor.a < alphaCutoff) {
if (alphaTest != 0 && texColor.a < alphaCutoff) {
discard;
}
if (colorKeyBlack != 0) {

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assets/shaders/m2.frag.spv
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4
src/rendering/swim_effects.cpp
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@ -180,7 +180,7 @@ bool SwimEffects::initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayou
.setVertexInput({binding}, attrs)
.setTopology(VK_PRIMITIVE_TOPOLOGY_POINT_LIST)
.setRasterization(VK_POLYGON_MODE_FILL, VK_CULL_MODE_NONE)
.setDepthTest(true, false, VK_COMPARE_OP_LESS)
.setDepthTest(false, false, VK_COMPARE_OP_LESS)
.setColorBlendAttachment(PipelineBuilder::blendAlpha())
.setMultisample(vkCtx->getMsaaSamples())
.setLayout(insectPipelineLayout)
@ -414,7 +414,7 @@ void SwimEffects::recreatePipelines() {
.setVertexInput({binding}, attrs)
.setTopology(VK_PRIMITIVE_TOPOLOGY_POINT_LIST)
.setRasterization(VK_POLYGON_MODE_FILL, VK_CULL_MODE_NONE)
.setDepthTest(true, false, VK_COMPARE_OP_LESS)
.setDepthTest(false, false, VK_COMPARE_OP_LESS)
.setColorBlendAttachment(PipelineBuilder::blendAlpha())
.setMultisample(vkCtx->getMsaaSamples())
.setLayout(insectPipelineLayout)