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#pragma BLENDER_REQUIRE(workbench_data_lib.glsl)
float curvature_soft_clamp(float curvature, float control)
{
if (curvature < 0.5 / control) {
return curvature * (1.0 - curvature * control);
}
return 0.25 / control;
}
void curvature_compute(vec2 uv,
usampler2D objectIdBuffer,
sampler2D normalBuffer,
out float curvature)
{
curvature = 0.0;
vec3 offset = vec3(world_data.viewport_size_inv, 0.0) * world_data.ui_scale;
uint object_up = texture(objectIdBuffer, uv + offset.zy).r;
uint object_down = texture(objectIdBuffer, uv - offset.zy).r;
uint object_right = texture(objectIdBuffer, uv + offset.xz).r;
uint object_left = texture(objectIdBuffer, uv - offset.xz).r;
/* Remove object outlines. */
if ((object_up != object_down) || (object_right != object_left)) {
return;
}
float normal_up = workbench_normal_decode(texture(normalBuffer, uv + offset.zy)).g;
float normal_down = workbench_normal_decode(texture(normalBuffer, uv - offset.zy)).g;
float normal_right = workbench_normal_decode(texture(normalBuffer, uv + offset.xz)).r;
float normal_left = workbench_normal_decode(texture(normalBuffer, uv - offset.xz)).r;
float normal_diff = (normal_up - normal_down) + (normal_right - normal_left);
if (normal_diff < 0) {
curvature = -2.0 * curvature_soft_clamp(-normal_diff, world_data.curvature_valley);
}
else {
curvature = 2.0 * curvature_soft_clamp(normal_diff, world_data.curvature_ridge);
}
}
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