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Merge pull request #68673 from clayjohn/RD-alpha-hash

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Fix alpha hash by correcting typos and doing calculations in object space
This commit is contained in:
Rémi Verschelde 2022-11-15 10:28:59 +01:00
commit 245e6454a0
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3 changed files with 8 additions and 5 deletions
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3
servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl
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@ -826,7 +826,8 @@ void fragment_shader(in SceneData scene_data) {
// alpha hash can be used in unison with alpha antialiasing
#ifdef ALPHA_HASH_USED
if (alpha < compute_alpha_hash_threshold(vertex, alpha_hash_scale)) {
vec3 object_pos = (inverse(read_model_matrix) * inv_view_matrix * vec4(vertex, 1.0)).xyz;
if (alpha < compute_alpha_hash_threshold(object_pos, alpha_hash_scale)) {
discard;
}
#endif // ALPHA_HASH_USED

3
servers/rendering/renderer_rd/shaders/forward_mobile/scene_forward_mobile.glsl
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@ -779,7 +779,8 @@ void main() {
// alpha hash can be used in unison with alpha antialiasing
#ifdef ALPHA_HASH_USED
if (alpha < compute_alpha_hash_threshold(vertex, alpha_hash_scale)) {
vec3 object_pos = (inverse(read_model_matrix) * inv_view_matrix * vec4(vertex, 1.0)).xyz;
if (alpha < compute_alpha_hash_threshold(object_pos, alpha_hash_scale)) {
discard;
}
#endif // ALPHA_HASH_USED

7
servers/rendering/renderer_rd/shaders/scene_forward_aa_inc.glsl
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@ -11,7 +11,8 @@ float hash_3d(vec3 p) {
float compute_alpha_hash_threshold(vec3 pos, float hash_scale) {
vec3 dx = dFdx(pos);
vec3 dy = dFdx(pos);
vec3 dy = dFdy(pos);
float delta_max_sqr = max(length(dx), length(dy));
float pix_scale = 1.0 / (hash_scale * delta_max_sqr);
@ -32,9 +33,9 @@ float compute_alpha_hash_threshold(vec3 pos, float hash_scale) {
1.0 - ((1.0 - a_interp) * (1.0 - a_interp) / (2.0 * min_lerp * (1.0 - min_lerp))));
float alpha_hash_threshold =
(lerp_factor < (1.0 - min_lerp)) ? ((lerp_factor < min_lerp) ? cases.x : cases.y) : cases.z;
(a_interp < (1.0 - min_lerp)) ? ((a_interp < min_lerp) ? cases.x : cases.y) : cases.z;
return clamp(alpha_hash_threshold, 0.0, 1.0);
return clamp(alpha_hash_threshold, 0.00001, 1.0);
}
#endif // ALPHA_HASH_USED