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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.
43 lines
1.1 KiB
GLSL
43 lines
1.1 KiB
GLSL
#version 450
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// M2 ribbon emitter vertex shader.
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// Ribbon geometry is generated CPU-side as a triangle strip.
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// Vertex format: pos(3) + color(3) + alpha(1) + uv(2) = 9 floats.
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layout(set = 0, binding = 0) uniform PerFrame {
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mat4 view;
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mat4 projection;
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mat4 lightSpaceMatrix;
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vec4 lightDir;
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vec4 lightColor;
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vec4 ambientColor;
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vec4 viewPos;
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vec4 fogColor;
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vec4 fogParams;
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vec4 shadowParams;
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};
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layout(location = 0) in vec3 aPos;
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layout(location = 1) in vec3 aColor;
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layout(location = 2) in float aAlpha;
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layout(location = 3) in vec2 aUV;
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layout(location = 0) out vec3 vColor;
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layout(location = 1) out float vAlpha;
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layout(location = 2) out vec2 vUV;
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layout(location = 3) out float vFogFactor;
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void main() {
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vec4 worldPos = vec4(aPos, 1.0);
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vec4 viewPos4 = view * worldPos;
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gl_Position = projection * viewPos4;
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float dist = length(viewPos4.xyz);
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float fogStart = fogParams.x;
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float fogEnd = fogParams.y;
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vFogFactor = clamp((fogEnd - dist) / max(fogEnd - fogStart, 0.001), 0.0, 1.0);
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vColor = aColor;
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vAlpha = aAlpha;
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vUV = aUV;
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}
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