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#ifndef CURVATURE_OFFSET
# define CURVATURE_OFFSET 1
#endif
float curvature_soft_clamp(float curvature, float control)
{
if (curvature < 0.5 / control) {
return curvature * (1.0 - curvature * control);
}
return 0.25 / control;
}
float calculate_curvature(
usampler2D objectId, sampler2D normalBuffer, ivec2 texel, float ridge, float valley)
{
uint object_up = texelFetchOffset(objectId, texel, 0, ivec2(0, CURVATURE_OFFSET)).r;
uint object_down = texelFetchOffset(objectId, texel, 0, ivec2(0, -CURVATURE_OFFSET)).r;
uint object_left = texelFetchOffset(objectId, texel, 0, ivec2(-CURVATURE_OFFSET, 0)).r;
uint object_right = texelFetchOffset(objectId, texel, 0, ivec2(CURVATURE_OFFSET, 0)).r;
if ((object_up != object_down) || (object_right != object_left)) {
return 0.0;
}
vec2 normal_up = texelFetchOffset(normalBuffer, texel, 0, ivec2(0, CURVATURE_OFFSET)).rg;
vec2 normal_down = texelFetchOffset(normalBuffer, texel, 0, ivec2(0, -CURVATURE_OFFSET)).rg;
vec2 normal_left = texelFetchOffset(normalBuffer, texel, 0, ivec2(-CURVATURE_OFFSET, 0)).rg;
vec2 normal_right = texelFetchOffset(normalBuffer, texel, 0, ivec2(CURVATURE_OFFSET, 0)).rg;
normal_up = workbench_normal_decode(normal_up).rg;
normal_down = workbench_normal_decode(normal_down).rg;
normal_left = workbench_normal_decode(normal_left).rg;
normal_right = workbench_normal_decode(normal_right).rg;
float normal_diff = ((normal_up.g - normal_down.g) + (normal_right.r - normal_left.r));
if (normal_diff < 0) {
return -2.0 * curvature_soft_clamp(-normal_diff, valley);
}
return 2.0 * curvature_soft_clamp(normal_diff, ridge);
}
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