mirror of
https://github.com/Kelsidavis/WoWee.git
synced 2026-03-22 23:30:14 +00:00
83d7f26f33
Alpha blending caused faint quad edges to be visible against the sky gradient. Additive blending correctly adds glow light without the outline artifact. Edge fade starts earlier and discard threshold raised.
62 lines
2.1 KiB
GLSL
62 lines
2.1 KiB
GLSL
#version 450
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layout(push_constant) uniform Push {
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mat4 model;
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vec4 celestialColor; // xyz = color, w = unused
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float intensity;
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float moonPhase;
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float animTime;
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} push;
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layout(location = 0) in vec2 TexCoord;
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layout(location = 0) out vec4 outColor;
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float valueNoise(vec2 p) {
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vec2 i = floor(p);
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vec2 f = fract(p);
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f = f * f * (3.0 - 2.0 * f);
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float a = fract(sin(dot(i, vec2(127.1, 311.7))) * 43758.5453);
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float b = fract(sin(dot(i + vec2(1.0, 0.0), vec2(127.1, 311.7))) * 43758.5453);
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float c = fract(sin(dot(i + vec2(0.0, 1.0), vec2(127.1, 311.7))) * 43758.5453);
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float d = fract(sin(dot(i + vec2(1.0, 1.0), vec2(127.1, 311.7))) * 43758.5453);
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return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);
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}
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void main() {
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vec2 uv = TexCoord - 0.5;
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float dist = length(uv);
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// Hard disc with smooth edge
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float disc = smoothstep(0.42, 0.35, dist);
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// Soft glow that fades to zero well within quad bounds
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// At dist=0.5 (quad edge), this should be negligible
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float glow = exp(-dist * dist * 18.0) * 0.5;
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// Combine disc and glow
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float alpha = max(disc, glow) * push.intensity;
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// Fade to zero well before quad edges
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float edgeFade = 1.0 - smoothstep(0.35, 0.48, dist);
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alpha *= edgeFade;
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vec3 color = push.celestialColor.rgb;
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// Animated haze/turbulence overlay for the sun disc
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if (push.intensity > 0.5) {
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float noise = valueNoise(uv * 8.0 + vec2(push.animTime * 0.3, push.animTime * 0.2));
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float noise2 = valueNoise(uv * 16.0 - vec2(push.animTime * 0.5, push.animTime * 0.15));
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float turbulence = (noise * 0.6 + noise2 * 0.4) * disc;
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color += vec3(turbulence * 0.3, turbulence * 0.15, 0.0);
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}
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// Moon phase shadow (only applied when intensity < 0.5, i.e. for moons)
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float phaseX = uv.x * 2.0 + push.moonPhase;
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float phaseShadow = smoothstep(-0.1, 0.1, phaseX);
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alpha *= mix(phaseShadow, 1.0, step(0.5, push.intensity));
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if (alpha < 0.003) discard;
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// Pre-multiply for additive blending: RGB is the light contribution
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outColor = vec4(color * alpha, alpha);
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}
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