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wmo: apply MOHD ambient color to interior group lighting

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Read the ambient color from the MOHD chunk (BGRA uint32) and store it
on WMOModel as a normalized RGB vec3.  Pass it through ModelData into
the per-batch WMOMaterialUBO (replacing the unused pad[3] bytes, keeping
the struct at 64 bytes).  The GLSL interior branch now floors vertex
colors against the WMO ambient instead of a hardcoded 0.5, so dungeon
interiors respect the artist-specified ambient tint from the WMO root
rather than always clamping to grey.
This commit is contained in:
Kelsi 2026-03-09 21:27:01 -07:00
parent 8561d5c58c
commit 4d1be18c18
6 changed files with 24 additions and 3 deletions
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11
assets/shaders/wmo.frag.glsl
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@ -29,6 +29,9 @@ layout(set = 1, binding = 1) uniform WMOMaterial {
float heightMapVariance;
float normalMapStrength;
int isLava;
float wmoAmbientR;
float wmoAmbientG;
float wmoAmbientB;
};
layout(set = 1, binding = 2) uniform sampler2D uNormalHeightMap;
@ -185,7 +188,13 @@ void main() {
} else if (unlit != 0) {
result = texColor.rgb * shadow;
} else if (isInterior != 0) {
vec3 mocv = max(VertColor.rgb, vec3(0.5));
// WMO interior: vertex colors (MOCV) are pre-baked lighting from the artist.
// The MOHD ambient color tints/floors the vertex colors so dark spots don't
// go completely black, matching the WoW client's interior shading.
vec3 wmoAmbient = vec3(wmoAmbientR, wmoAmbientG, wmoAmbientB);
// Clamp ambient to at least 0.3 to avoid total darkness when MOHD color is zero
wmoAmbient = max(wmoAmbient, vec3(0.3));
vec3 mocv = max(VertColor.rgb, wmoAmbient);
result = texColor.rgb * mocv * shadow;
} else {
vec3 ldir = normalize(-lightDir.xyz);