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Add maximum roughness cutoff to SSR to improve performance

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In a test scene with mixed rough and non-rough materials, this saves
upwards of 0.15 ms of GPU time with very little visual artifacting
(GTX 1080, 2560×1440).
This commit is contained in:
Hugo Locurcio 2022-01-15 01:36:19 +01:00
parent e9c7140cfa
commit 7745bd42a6
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GPG key ID: 39E8F8BE30B0A49C
1 changed files with 13 additions and 3 deletions
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16
servers/rendering/renderer_rd/shaders/effects/screen_space_reflection.glsl
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@ -66,6 +66,19 @@ void main() {
vec4 normal_roughness = imageLoad(source_normal_roughness, ssC);
vec3 normal = normal_roughness.xyz * 2.0 - 1.0;
float roughness = normal_roughness.w;
// The roughness cutoff of 0.6 is chosen to match the roughness fadeout from GH-69828.
if (roughness > 0.6) {
// Do not compute SSR for rough materials to improve performance at the cost of
// subtle artifacting.
#ifdef MODE_ROUGH
imageStore(blur_radius_image, ssC, vec4(0.0));
#endif
imageStore(ssr_image, ssC, vec4(0.0));
return;
}
normal = normalize(normal);
normal.y = -normal.y; //because this code reads flipped
@ -81,8 +94,6 @@ void main() {
imageStore(ssr_image, ssC, vec4(0.0));
return;
}
//ray_dir = normalize(view_dir - normal * dot(normal,view_dir) * 2.0);
//ray_dir = normalize(vec3(1.0, 1.0, -1.0));
////////////////
@ -220,7 +231,6 @@ void main() {
// if roughness is enabled, do screen space cone tracing
float blur_radius = 0.0;
float roughness = normal_roughness.w;
if (roughness > 0.001) {
float cone_angle = min(roughness, 0.999) * M_PI * 0.5;