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EEVEE-Next: Make Anti-Flicker more strong 

This might make the image a bit blurier but it reduces the flickering of
shiny surfaces during animation.

This uses the technique described in "High Quality Temporal Supersampling"
by Brian Karis at Siggraph 2014 (Slide 45): Reduce the exponential factor
when the history is close the bounding box border.
This commit is contained in:
Clément Foucault 2022-07-24 14:46:44 +02:00
parent bd9bb56f18
commit 8ac5b1fdb3
1 changed files with 20 additions and 9 deletions
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29
source/blender/draw/engines/eevee_next/shaders/eevee_film_lib.glsl
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@ -381,12 +381,9 @@ float film_aabb_clipping_dist_alpha(float origin, float direction, float aabb_mi
}
/* Modulate the history color to avoid ghosting artifact. */
vec4 film_amend_combined_history(vec4 color_history, vec4 src_color, ivec2 src_texel)
vec4 film_amend_combined_history(
vec4 min_color, vec4 max_color, vec4 color_history, vec4 src_color, ivec2 src_texel)
{
/* Get local color bounding box of source neighboorhood. */
vec4 min_color, max_color;
film_combined_neighbor_boundbox(src_texel, min_color, max_color);
/* Clip instead of clamping to avoid color accumulating in the AABB corners. */
vec4 clip_dir = src_color - color_history;
@ -402,6 +399,8 @@ vec4 film_amend_combined_history(vec4 color_history, vec4 src_color, ivec2 src_t
float film_history_blend_factor(float velocity,
vec2 texel,
float luma_min,
float luma_max,
float luma_incoming,
float luma_history)
{
@ -409,8 +408,15 @@ float film_history_blend_factor(float velocity,
float blend = 0.05;
/* Blend less history if the pixel has substential velocity. */
blend = mix(blend, 0.20, saturate(velocity * 0.02));
/* Weight by luma. */
blend = max(blend, saturate(0.01 * luma_history / abs(luma_history - luma_incoming)));
/**
* "High Quality Temporal Supersampling" by Brian Karis at Siggraph 2014 (Slide 43)
* Bias towards history if incomming pixel is near clamping. Reduces flicker.
*/
float distance_to_luma_clip = min_v2(vec2(luma_history - luma_min, luma_max - luma_history));
/* Divide by bbox size to get a factor. 2 factor to compensate the line above. */
distance_to_luma_clip *= 2.0 * safe_rcp(luma_max - luma_min);
/* Linearly blend when history gets bellow to 25% of the bbox size. */
blend *= saturate(distance_to_luma_clip * 4.0 + 0.1);
/* Discard out of view history. */
if (any(lessThan(texel, vec2(0))) || any(greaterThanEqual(texel, film_buf.extent))) {
blend = 1.0;
@ -451,9 +457,14 @@ void film_store_combined(
color_dst = film_sample_catmull_rom(in_combined_tx, history_texel);
color_dst.rgb = film_YCoCg_from_scene_linear(color_dst.rgb);
float blend = film_history_blend_factor(velocity, history_texel, color_src.x, color_dst.x);
/* Get local color bounding box of source neighboorhood. */
vec4 min_color, max_color;
film_combined_neighbor_boundbox(src_texel, min_color, max_color);
color_dst = film_amend_combined_history(color_dst, color_src, src_texel);
float blend = film_history_blend_factor(
velocity, history_texel, min_color.x, max_color.x, color_src.x, color_dst.x);
color_dst = film_amend_combined_history(min_color, max_color, color_dst, color_src, src_texel);
/* Luma weighted blend to avoid flickering. */
weight_dst = film_luma_weight(color_dst.x) * (1.0 - blend);