GameDev/Godot-Shader-Lib
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RotateUV, SwirlUV and TwirlUV algorithms updated

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This commit is contained in:
Digvijaysinh Gohil 2024-05-30 00:06:38 +05:30
parent 9f8087e91d
commit ce44d78559
3 changed files with 19 additions and 11 deletions
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9
addons/ShaderLib/UV/RotateUV.gdshaderinc
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@ -3,8 +3,11 @@ vec2 rotate_uv(vec2 uv, vec2 center, float rotation, bool use_degrees){
if(use_degrees){ if(use_degrees){
_angle = rotation * (3.1415926/180.0); _angle = rotation * (3.1415926/180.0);
} }
mat2 _rotation = mat2(
vec2(cos(_angle), -sin(_angle)),
vec2(sin(_angle), cos(_angle))
);
vec2 _delta = uv - center; vec2 _delta = uv - center;
float _x = cos(_angle) * _delta.x - sin(_angle) * _delta.y; _delta = _rotation * _delta;
float _y = sin(_angle) * _delta.x + cos(_angle) * _delta.y; return _delta + center;
return vec2(_x + center.x, _y + center.y);
} }

12
addons/ShaderLib/UV/SwirlUV.gdshaderinc
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@ -1,8 +1,10 @@
vec2 swirl_uv(vec2 uv, vec2 center, float strength, vec2 offset){ vec2 swirl_uv(vec2 uv, vec2 center, float strength, vec2 offset){
vec2 _delta = uv - center; vec2 _delta = uv - center;
float _inverse_length = 1.0 - length(_delta); float _angle = strength * pow(1. - length(_delta), 3);
float _angle = strength * _inverse_length; mat2 _rotation = mat2(
float _x = cos(_angle) * _delta.x - sin(_angle) * _delta.y; vec2(cos(_angle), -sin(_angle)),
float _y = sin(_angle) * _delta.x + cos(_angle) * _delta.y; vec2(sin(_angle), cos(_angle))
return vec2(_x + center.x + offset.x, _y + center.y + offset.y); );
_delta = _rotation * _delta;
return _delta + center;
} }

9
addons/ShaderLib/UV/TwirlUV.gdshaderinc
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@ -1,7 +1,10 @@
vec2 twirl_uv(vec2 uv, vec2 center, float strength, vec2 offset){ vec2 twirl_uv(vec2 uv, vec2 center, float strength, vec2 offset){
vec2 _delta = uv - center; vec2 _delta = uv - center;
float _angle = strength * length(_delta); float _angle = strength * length(_delta);
float _x = cos(_angle) * _delta.x - sin(_angle) * _delta.y; mat2 _rotation = mat2(
float _y = sin(_angle) * _delta.x + cos(_angle) * _delta.y; vec2(cos(_angle), -sin(_angle)),
return vec2(_x + center.x + offset.x, _y + center.y + offset.y); vec2(sin(_angle), cos(_angle))
);
_delta = _rotation * _delta;
return _delta + center;
} }