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#pragma BLENDER_REQUIRE(sculpt_paint_image_lib.glsl)
bool SCULPT_brush_test(PaintBrushTestData test_data,
PaintStepData step_data,
vec3 co,
out float dist)
{
#if defined(BRUSH_TEST_SPHERE)
return SCULPT_brush_test_sphere(test_data, step_data, co, dist);
#elif defined(BRUSH_TEST_CIRCLE)
return SCULPT_brush_test_circle(test_data, step_data, co, dist);
#else
dist = 0.0;
return true;
#endif
}
void main()
{
PackedPixelRow row = pixel_row_buf[gl_GlobalInvocationID.x + pixel_row_offset];
TrianglePaintInput triangle = paint_input[PIXEL_ROW_PRIM_INDEX(row)];
ivec2 image_coord = PIXEL_ROW_START_IMAGE_COORD(row);
uint row_len = PIXEL_ROW_LEN(row);
vec3 co1 = vec3(vert_coord_buf[triangle.vert_indices.x]);
vec3 co2 = vec3(vert_coord_buf[triangle.vert_indices.y]);
vec3 co3 = vec3(vert_coord_buf[triangle.vert_indices.z]);
vec3 pos;
vec3 delta;
SCULPT_get_row_pos_and_delta(co1, co2, co3, triangle, row, pos, delta);
for (int x = 0; x < row_len; x++) {
/* TODO: Do clipping test. */
vec4 color;
bool color_read = false;
for (int step_index = paint_step_range[0]; step_index < paint_step_range[1]; step_index++) {
PaintStepData step_data = paint_step_buf[step_index];
float distance;
bool test_result = SCULPT_brush_test(paint_brush_buf.test, step_data, pos, distance);
if (test_result) {
if (!color_read) {
color = imageLoad(out_img, image_coord);
color_read = true;
}
// TODO: blend with color...
float factor = SCULPT_hardness_factor(distance, step_data.hardness, step_data.radius);
float curve_factor = SCULPT_curve_strength(factor, paint_brush_buf.falloff_shape);
vec4 final_paint_color = SCULPT_blend_color(
color, paint_brush_buf.color * curve_factor * step_data.strength);
final_paint_color *= paint_brush_buf.alpha;
color = SCULPT_blend_color(color, final_paint_color);
}
}
if (color_read) {
imageStore(out_img, image_coord, color);
}
image_coord.x += 1;
pos += delta;
}
}
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