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/**
* Bokeh Look Up Table: This outputs a radius multiplier to shape the sampling in gather pass or
* the scatter sprite appearance. This is only used if bokeh shape is either anamorphic or is not
* a perfect circle.
* We correct samples spacing for polygonal bokeh shapes. However, we do not for anamorphic bokeh
* as it is way more complex and expensive to do.
*/
#pragma BLENDER_REQUIRE(eevee_depth_of_field_lib.glsl)
void main()
{
vec2 gather_uv = ((vec2(gl_GlobalInvocationID.xy) + 0.5) / float(DOF_BOKEH_LUT_SIZE));
/* Center uv in range [-1..1]. */
gather_uv = gather_uv * 2.0 - 1.0;
vec2 slight_focus_texel = vec2(gl_GlobalInvocationID.xy) - float(dof_max_slight_focus_radius);
float radius = length(gather_uv);
if (dof_buf.bokeh_blades > 0.0) {
/* NOTE: atan(y,x) has output range [-M_PI..M_PI], so add 2pi to avoid negative angles. */
float theta = atan(gather_uv.y, gather_uv.x) + M_2PI;
float r = length(gather_uv);
radius /= circle_to_polygon_radius(dof_buf.bokeh_blades, theta - dof_buf.bokeh_rotation);
float theta_new = circle_to_polygon_angle(dof_buf.bokeh_blades, theta);
float r_new = circle_to_polygon_radius(dof_buf.bokeh_blades, theta_new);
theta_new -= dof_buf.bokeh_rotation;
gather_uv = r_new * vec2(-cos(theta_new), sin(theta_new));
{
/* Slight focus distance */
slight_focus_texel *= dof_buf.bokeh_anisotropic_scale_inv;
float theta = atan(slight_focus_texel.y, -slight_focus_texel.x) + M_2PI;
slight_focus_texel /= circle_to_polygon_radius(dof_buf.bokeh_blades,
theta + dof_buf.bokeh_rotation);
}
}
else {
gather_uv *= safe_rcp(length(gather_uv));
}
ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
/* For gather store the normalized UV. */
imageStore(out_gather_lut_img, texel, gather_uv.xyxy);
/* For scatter store distance. LUT will be scaled by COC. */
imageStore(out_scatter_lut_img, texel, vec4(radius));
/* For slight focus gather store pixel perfect distance. */
imageStore(out_resolve_lut_img, texel, vec4(length(slight_focus_texel)));
}
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