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https://github.com/Kelsidavis/WoWee.git
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1108aa9ae6
Parse M2RibbonEmitter data (WotLK format) from M2 files — bone index, position, color/alpha/height tracks, edgesPerSecond, edgeLifetime, gravity. Add CPU-side trail simulation per instance (edge birth at bone world position, lifetime expiry, gravity droop). New m2_ribbon.vert/frag shaders render a triangle-strip quad per emitter using the existing particleTexLayout_ descriptor set. Supports both alpha-blend and additive pipeline variants based on material blend mode. Fixes invisible spell trail effects (~5-10%% of spell visuals) that were silently skipped.
25 lines
826 B
GLSL
25 lines
826 B
GLSL
#version 450
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// M2 ribbon emitter fragment shader.
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// Samples the ribbon texture, multiplied by vertex color and alpha.
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// Uses additive blending (pipeline-level) for magic/spell trails.
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layout(set = 1, binding = 0) uniform sampler2D uTexture;
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layout(location = 0) in vec3 vColor;
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layout(location = 1) in float vAlpha;
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layout(location = 2) in vec2 vUV;
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layout(location = 3) in float vFogFactor;
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layout(location = 0) out vec4 outColor;
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void main() {
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vec4 tex = texture(uTexture, vUV);
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// For additive ribbons alpha comes from texture luminance; multiply by vertex alpha.
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float a = tex.a * vAlpha;
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if (a < 0.01) discard;
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vec3 rgb = tex.rgb * vColor;
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// Ribbons fade slightly with fog (additive blend attenuated toward black = invisible in fog).
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rgb *= vFogFactor;
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outColor = vec4(rgb, a);
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}
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