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feat(render): matte and tinted copies of a material, the steel weathered or tinted as far as the userdata of its vertices says

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Matte_Material() gives a copy of a material with its glossiness damped and its weathering on: the faces cut out of a polished surface, as the sides of a worn rail head, darken and lose the shine by the userdata of their vertices. Tinted_Material() gives a copy whose texture is tinted to a colour as far instead. Both are made once per material.

The weathering and the tint colour have a param slot of their own, param[3]: the shaders of the materials use all four components of param[2] among them (detail, parallax, water, the terrain placement), and light_common.glsl is included in all of them. MAX_PARAMS grows from 3 to 4, the model UBO by 16 bytes. Neither copy is made when another param of the shader lies on the components it would set.
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maj00r
2026-11-03 21:50:32 +01:00
parent a24118baf7
commit 89c4555e1e
4 changed files with 143 additions and 1 deletions
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18
shaders/light_common.glsl
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@@ -9,6 +9,11 @@ uniform sampler2D headlightmap;
float glossiness = 1.0;
float metalic = 0.0;
in vec4 UserData;
// a slot of its own, the shaders of the materials using all of param[2]: how weathered the steel is as far as the userdata of
// its vertices says; below 0: the texture tinted to the colour of tint as far instead
#param (weathering, 3, 3, 1, zero)
#param (tint, 3, 0, 3, one)
// ---------------------------------------------------------------------
// Lighting balance tunables - tweak these to control overall scene
@@ -285,6 +290,19 @@ vec3 apply_lights(vec3 fragcolor, vec3 fragnormal, vec3 texturecolor, float refl
{
// Diffuse colour is applied once, to the albedo; the light terms below are not scaled by it again
texturecolor *= material_diffuse();
float weathered = (param[3].w > 0.0 ? clamp(param[3].w * UserData.x, 0.0, 1.0) : 0.0);
float tinted = (param[3].w < 0.0 ? clamp(-param[3].w * UserData.x, 0.0, 1.0) : 0.0);
// a tint only scales the colour of the texture, the steel keeps its own polish
float polished = weathered * smoothstep(0.03, 0.12, dot(texturecolor, vec3(0.2126, 0.7152, 0.0722)));
float weatheredluma = min(dot(texturecolor, vec3(0.2126, 0.7152, 0.0722)), 0.05);
vec3 unused = texturecolor * (weatheredluma / max(dot(texturecolor, vec3(0.2126, 0.7152, 0.0722)), 1e-4));
unused = mix(unused, vec3(1.0, 0.82, 0.74) * (weatheredluma / 0.8525), 0.5);
texturecolor = mix(texturecolor, unused, smoothstep(0.0, 0.4, weathered));
texturecolor = (tinted > 0.0 ? texturecolor * mix(vec3(1.0), param[3].rgb, tinted) : texturecolor);
specularity = mix(specularity, min(specularity, 0.03), smoothstep(0.0, 0.4, polished));
metalic = mix(metalic, 0.0, polished);
glossiness = mix(glossiness, min(glossiness, 0.06 * abs(param[1].w)), polished);
reflectivity = mix(reflectivity, min(reflectivity, 0.08 * param[1].z), smoothstep(0.0, 0.4, polished));
// Scale ambient before it gets tinted by the texture.
// Sun, headlights and emission are added afterwards so they are NOT
// attenuated by AMBIENT_SCALE - this only dims the indirect term.