mirror of
https://github.com/marinho/godot-visual-effects.git
synced 2024-12-22 14:37:27 +08:00
60 lines
1.6 KiB
Plaintext
60 lines
1.6 KiB
Plaintext
/**
|
|
* Draws a filled circle
|
|
*/
|
|
float drawFullCircle(vec2 center, float radius, vec2 uv)
|
|
{
|
|
return (distance(center, uv) <= radius) ? 1. : 0.;
|
|
}
|
|
|
|
/**
|
|
* Draws a line circle
|
|
*/
|
|
float drawLineCircle(vec2 center, float radius, float stroke, vec2 uv)
|
|
{
|
|
return drawFullCircle(center, radius, uv)
|
|
- drawFullCircle(center, radius - stroke, uv);
|
|
}
|
|
|
|
/**
|
|
* Draws a line from p1 to p2
|
|
*
|
|
* @param p1 vec2
|
|
* @param p2 vec2
|
|
* @param stroke float
|
|
* @param uv float to receive uv from fragment function
|
|
* @param one_px float This param should receive SCREEN_PIXEL_SIZE.x, as SCREEN_PIXEL_SIZE
|
|
* cannot be accessed from outside fragment() function
|
|
*/
|
|
float drawLine(vec2 p1, vec2 p2, float stroke, vec2 uv, float one_px)
|
|
{
|
|
float r = 0.;
|
|
|
|
// get dist between points
|
|
float d = distance(p1, p2);
|
|
|
|
// get dist between current pixel and p1
|
|
float duv = distance(p1, uv);
|
|
|
|
//if point is on line, according to dist, it should match current uv
|
|
r = 1.-floor(1.-(stroke * one_px)+distance (mix(p1, p2, clamp(duv/d, 0., 1.)), uv));
|
|
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* Draws a triangle
|
|
*/
|
|
float drawTriangle(vec2 p1, vec2 p2, vec2 p3, float stroke, vec2 uv, float one_px) {
|
|
return drawLine(p1, p2, stroke, uv, one_px)
|
|
+ drawLine(p2, p3, stroke, uv, one_px)
|
|
+ drawLine(p3, p1, stroke, uv, one_px);
|
|
}
|
|
|
|
/**
|
|
* Draws a triangle with no baseline
|
|
*/
|
|
float drawArrowTriangle(vec2 p1, vec2 p2, vec2 p3, float stroke, vec2 uv, float one_px) {
|
|
return drawLine(p1, p2, stroke, uv, one_px)
|
|
+ drawLine(p3, p1, stroke, uv, one_px);
|
|
}
|