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#version 330 core
#define Pi32 3.1415926535897
#define v2 vec2
#define v3 vec3
#define v4 vec4
#define f32 float
#define b32 int
in v2 VS_Pos;
in v4 VS_Dest;
in v2 VS_TexCoord;
in v2 VS_Center;
in v2 VS_HalfSize;
in v4 VS_Color;
in f32 VS_CornerRadius;
in f32 VS_BorderThickness;
in f32 VS_Softness;
flat in f32 VS_HasTexture;
uniform sampler2D Texture;
out v4 FragColor;
v3
HSV2RGB(v3 Color)
{
v4 K = v4(1.0, 2.0/3.0, 1.0/3.0, 3.0);
v3 p = abs(fract(Color.xxx + K.xyz) * 6.0 - K.www);
return Color.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), Color.y);
}
f32
BoxSDF(v2 Pos, v2 HalfDim, f32 CornerRadius)
{
v2 q = abs(Pos) - (HalfDim - CornerRadius);
f32 Distance = min(max(q.x, q.y), 0.0) + length(max(q, 0.0)) - CornerRadius;
return Distance;
}
void main()
{
v4 Color = VS_Color;
f32 tBorder = 1.0;
if(VS_BorderThickness > 0.0)
{
f32 sBorder = BoxSDF(VS_Pos,
VS_HalfSize - v2(VS_Softness*2.0, VS_Softness*2.0) - VS_BorderThickness,
max(VS_CornerRadius-VS_BorderThickness, 0.0));
tBorder = smoothstep(0.0, 2.0*VS_Softness, sBorder);
}
if(tBorder < 0.001f)
{
discard;
}
f32 tCorner = 1.0;
if(VS_CornerRadius > 0.0 || VS_Softness > 0.75f)
{
f32 sCorner = BoxSDF(VS_Pos,
VS_HalfSize - v2(VS_Softness*2.0, VS_Softness*2.0),
VS_CornerRadius);
tCorner = 1.0-smoothstep(0.0, 2.0*VS_Softness, sCorner);
}
if(VS_HasTexture > 0)
{
f32 Alpha = texture(Texture, VS_TexCoord).r;
Color.a *= Alpha;;
}
Color.a *= tBorder;
Color.a *= tCorner;
FragColor = Color;
}
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