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Differential D16083 Diff 56430 source/blender/gpu/shaders/sculpt_paint/sculpt_paint_image_lib.glsl

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source/blender/gpu/shaders/sculpt_paint/sculpt_paint_image_lib.glsl

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/* -------------------------------------------------------------------- */
/** \name Brush testing
* \{ */
vec4 SCULPT_blend_color(vec4 src1, vec4 src2)
{
return src1 * (1.0 - src2.a) + src2;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Brush testing
* \{ */
float SCULPT_curve_strength(float factor, int curve_type)
{
if (factor > 1.0) {
return 0.0;
}
float p = 1.0 - factor;
switch (curve_type) {
case 0 /*BRUSH_CURVE_CUSTOM*/:
return factor;
case 1 /*BRUSH_CURVE_SMOOTH*/:
return 3.0 * p * p - 2.0 * p * p * p;
case 2 /*BRUSH_CURVE_SPHERE*/:
return sqrt(2.0 * p - p * p);
case 3 /*BRUSH_CURVE_ROOT*/:
return sqrt(p);
case 4 /*BRUSH_CURVE_SHARP*/:
return p * p;
case 5 /*BRUSH_CURVE_LIN*/:
return p;
case 6 /*BRUSH_CURVE_POW4*/:
return p * p * p * p;
case 7 /*BRUSH_CURVE_INVSQUARE*/:
return p * (2.0 - p);
case 8 /*BRUSH_CURVE_CONSTANT*/:
return 1.0;
case 9 /*BRUSH_CURVE_SMOOTHER*/:
return p * p * p * (p * (p * 6.0 - 15.0) + 10.0);
default:
return factor;
}
return factor;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Brush testing
* \{ */
float SCULPT_hardness_factor(float dist, float hardness, float radius)
{
float p = dist / radius;
if (p < hardness) {
return 0.0;
}
else if (hardness >= 1.0) {
return 1.0;
}
return (p - hardness) / (1.0 - hardness);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Brush testing
* \{ */
bool SCULPT_brush_test_sphere(PaintBrushTestData test_data,
PaintStepData step_data,
vec3 co,
out float dist)
{
dist = distance(vec3(step_data.location), co);
return dist <= step_data.radius;
}
float plane_point_side_v3(vec4 plane, vec3 co)
{
return dot(co, vec3(plane)) + plane.w;
}
vec3 closest_to_plane_normalized_v3(vec4 plane, vec3 co)
{
float side = plane_point_side_v3(plane, co);
return (vec3(plane) * -side) + co;
}
bool SCULPT_brush_test_circle(PaintBrushTestData test_data,
PaintStepData step_data,
vec3 co,
out float dist)
{
vec3 proj = closest_to_plane_normalized_v3(step_data.plane_view, co);
return SCULPT_brush_test_sphere(test_data, step_data, proj, dist);
}
/** \} */
void SCULPT_get_row_pos_and_delta(vec3 co1,
vec3 co2,
vec3 co3,
TrianglePaintInput triangle,
PackedPixelRow row,
out vec3 pos,
out vec3 delta)
{
vec3 barycentric_weights = vec3(row.start_barycentric_coord,
1.0 - row.start_barycentric_coord.x -
row.start_barycentric_coord.y);
mat3 coords = mat3(co1, co2, co3);
pos = coords * barycentric_weights;
vec2 next_barycentric = row.start_barycentric_coord + triangle.delta_barycentric_coord;
barycentric_weights = vec3(next_barycentric, 1.0 - next_barycentric.x - next_barycentric.y);
vec3 next_pos = coords * barycentric_weights;
delta = next_pos - pos;
}