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[3.x] Allow Distance Fade Pixel Dither and Object Dither in the GLES2 backend #50295

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[3.x] Allow Distance Fade Pixel Dither and Object Dither in the GLES2 backend #50295

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31 changes: 14 additions & 17 deletions scene/resources/material.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -914,25 +914,22 @@ void SpatialMaterial::_update_shader() {
// Use the slightly more expensive circular fade (distance to the object) instead of linear
// (Z distance), so that the fade is always the same regardless of the camera angle.
if ((distance_fade == DISTANCE_FADE_OBJECT_DITHER || distance_fade == DISTANCE_FADE_PIXEL_DITHER)) {
if (!VisualServer::get_singleton()->is_low_end()) {
code += "\t{\n";

if (distance_fade == DISTANCE_FADE_OBJECT_DITHER) {
code += "\t\tfloat fade_distance = length((INV_CAMERA_MATRIX * WORLD_MATRIX[3]));\n";
} else {
code += "\t\tfloat fade_distance = length(VERTEX);\n";
}
// Use interleaved gradient noise, which is fast but still looks good.
code += "\t\tconst vec3 magic = vec3(0.06711056f, 0.00583715f, 52.9829189f);";
code += "\t\tfloat fade = clamp(smoothstep(distance_fade_min, distance_fade_max, fade_distance), 0.0, 1.0);\n";
// Use a hard cap to prevent a few stray pixels from remaining when past the fade-out distance.
code += "\t\tif (fade < 0.001 || fade < fract(magic.z * fract(dot(FRAGCOORD.xy, magic.xy)))) {\n";
code += "\t\t\tdiscard;\n";
code += "\t\t}\n";

code += "\t}\n\n";
code += "\t{\n";

if (distance_fade == DISTANCE_FADE_OBJECT_DITHER) {
code += "\t\tfloat fade_distance = length((INV_CAMERA_MATRIX * WORLD_MATRIX[3]));\n";
} else {
code += "\t\tfloat fade_distance = length(VERTEX);\n";
}
// Use interleaved gradient noise, which is fast but still looks good.
code += "\t\tconst vec3 magic = vec3(0.06711056f, 0.00583715f, 52.9829189f);";
code += "\t\tfloat fade = clamp(smoothstep(distance_fade_min, distance_fade_max, fade_distance), 0.0, 1.0);\n";
// Use a hard cap to prevent a few stray pixels from remaining when past the fade-out distance.
code += "\t\tif (fade < 0.001 || fade < fract(magic.z * fract(dot(FRAGCOORD.xy, magic.xy)))) {\n";
code += "\t\t\tdiscard;\n";
code += "\t\t}\n";

code += "\t}\n\n";
} else {
code += "\tALPHA *= clamp(smoothstep(distance_fade_min, distance_fade_max, length(VERTEX)), 0.0, 1.0);\n";
}
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