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Add texture displacement bump and UV-check shaders

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ExPikaPaka
2026-07-16 08:43:08 +02:00
parent a7c8dcc58d
commit a393b21642
9 changed files with 415 additions and 30 deletions
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62
resources/shaders/110/texture_displacement_bump.fs
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@@ -30,11 +30,33 @@ uniform float tiling_scale;
uniform float rotation_rad;
uniform vec2 uv_offset;
uniform bool invert;
uniform bool use_vertex_uv;
// 2x3 affine (lin = (m00, m01, m10, m11), tr = (m02, m12)) applied to the dragged island's uv; see the
// 140 variant. Identity when nothing is dragged.
uniform vec4 island_delta_lin;
uniform vec2 island_delta_tr;
varying vec3 clipping_planes_dots;
varying vec4 model_pos;
varying vec4 world_pos;
varying float weight;
varying float active;
varying vec2 vertex_uv;
void projection_axes(vec3 n, out vec3 t, out vec3 b)
{
vec3 an = abs(n);
if (an.x >= an.y && an.x >= an.z) { // planar = p.yz
t = vec3(0.0, 1.0, 0.0);
b = vec3(0.0, 0.0, 1.0);
} else if (an.y >= an.x && an.y >= an.z) { // planar = p.xz
t = vec3(1.0, 0.0, 0.0);
b = vec3(0.0, 0.0, 1.0);
} else { // planar = p.xy
t = vec3(1.0, 0.0, 0.0);
b = vec3(0.0, 1.0, 0.0);
}
}
vec2 project_uv(vec3 p, vec3 n)
{
@@ -55,15 +77,45 @@ void main()
if (volume_mirrored)
triangle_normal = -triangle_normal;
if (weight > 0.0) {
vec2 uv = project_uv(model_pos.xyz, triangle_normal);
if (use_vertex_uv) {
// Mikkelsen surface-gradient bump; see the 140 variant for the full rationale. Scale-exact
// for a conformal LSCM map (no global 1/tiling assumption), and gated by the paint weight
// via a multiply so the branch stays uniform (use_vertex_uv is a uniform).
vec2 uv = (active > 0.5)
? vec2(dot(island_delta_lin.xy, vertex_uv), dot(island_delta_lin.zw, vertex_uv)) + island_delta_tr
: vertex_uv;
float h = texture2D(height_tex, uv).r;
float k = (invert ? -1.0 : 1.0) * depth_mm * clamp(weight, 0.0, 1.0);
vec3 sigmaS = dFdx(model_pos.xyz);
vec3 sigmaT = dFdy(model_pos.xyz);
vec3 R1 = cross(sigmaT, triangle_normal);
vec3 R2 = cross(triangle_normal, sigmaS);
float det = dot(sigmaS, R1);
float dHdx = k * dFdx(h);
float dHdy = k * dFdy(h);
if (abs(det) > 1e-12)
triangle_normal = normalize(triangle_normal - (dHdx * R1 + dHdy * R2) / det);
} else if (weight > 0.0) {
vec2 uv = project_uv(model_pos.xyz, triangle_normal);
vec3 t, b;
projection_axes(triangle_normal, t, b);
float hL = texture2D(height_tex, uv - vec2(height_tex_texel.x, 0.0)).r;
float hR = texture2D(height_tex, uv + vec2(height_tex_texel.x, 0.0)).r;
float hD = texture2D(height_tex, uv - vec2(0.0, height_tex_texel.y)).r;
float hU = texture2D(height_tex, uv + vec2(0.0, height_tex_texel.y)).r;
float sign_mul = invert ? -1.0 : 1.0;
vec3 bumped_normal = normalize(triangle_normal + sign_mul * depth_mm * vec3(hL - hR, hD - hU, 0.0));
triangle_normal = normalize(mix(triangle_normal, bumped_normal, clamp(weight, 0.0, 1.0)));
vec2 dh_duv = vec2((hR - hL) / (2.0 * height_tex_texel.x), (hU - hD) / (2.0 * height_tex_texel.y));
float inv_tiling = (tiling_scale > 1e-6) ? (1.0 / tiling_scale) : 1.0;
float amplitude = (invert ? -1.0 : 1.0) * depth_mm * inv_tiling * clamp(weight, 0.0, 1.0);
float cs = cos(rotation_rad);
float sn = sin(rotation_rad);
vec2 slope = amplitude * vec2(dh_duv.x * cs + dh_duv.y * sn, -dh_duv.x * sn + dh_duv.y * cs);
vec3 gradient = slope.x * t + slope.y * b;
gradient -= triangle_normal * dot(triangle_normal, gradient);
triangle_normal = normalize(triangle_normal - gradient);
}
vec3 eye_normal = normalize(view_normal_matrix * triangle_normal);