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/**
* Scatter pass: Use sprites to scatter the color of very bright pixel to have higher quality blur.
*
* We only scatter one quad per sprite and one sprite per 4 pixels to reduce vertex shader
* invocations and overdraw.
*/
#pragma BLENDER_REQUIRE(eevee_depth_of_field_lib.glsl)
#define linearstep(p0, p1, v) (clamp(((v) - (p0)) / abs((p1) - (p0)), 0.0, 1.0))
void main()
{
vec4 coc4 = vec4(interp.color_and_coc1.w,
interp.color_and_coc2.w,
interp.color_and_coc3.w,
interp.color_and_coc4.w);
vec4 shapes;
if (use_bokeh_lut) {
shapes = vec4(texture(bokeh_lut_tx, interp.rect_uv1).r,
texture(bokeh_lut_tx, interp.rect_uv2).r,
texture(bokeh_lut_tx, interp.rect_uv3).r,
texture(bokeh_lut_tx, interp.rect_uv4).r);
}
else {
shapes = vec4(length(interp.rect_uv1),
length(interp.rect_uv2),
length(interp.rect_uv3),
length(interp.rect_uv4));
}
shapes *= interp.distance_scale;
/* Becomes signed distance field in pixel units. */
shapes -= coc4;
/* Smooth the edges a bit to fade out the undersampling artifacts. */
shapes = saturate(1.0 - linearstep(-0.8, 0.8, shapes));
/* Outside of bokeh shape. Try to avoid overloading ROPs. */
if (max_v4(shapes) == 0.0) {
discard;
}
if (!no_scatter_occlusion) {
/* Works because target is the same size as occlusion_tx. */
vec2 uv = gl_FragCoord.xy / vec2(textureSize(occlusion_tx, 0).xy);
vec2 occlusion_data = texture(occlusion_tx, uv).rg;
/* Fix tilling artifacts. (Slide 90) */
const float correction_fac = 1.0 - DOF_FAST_GATHER_COC_ERROR;
/* Occlude the sprite with geometry from the same field using a chebychev test (slide 85). */
float mean = occlusion_data.x;
float variance = occlusion_data.y;
shapes *= variance * safe_rcp(variance + sqr(max(coc4 * correction_fac - mean, 0.0)));
}
out_color = (interp.color_and_coc1 * shapes[0] + interp.color_and_coc2 * shapes[1] +
interp.color_and_coc3 * shapes[2] + interp.color_and_coc4 * shapes[3]);
/* Do not accumulate alpha. This has already been accumulated by the gather pass. */
out_color.a = 0.0;
if (debug_scatter_perf) {
out_color.rgb = avg(out_color.rgb) * vec3(1.0, 0.0, 0.0);
}
}
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