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// -*- mode: c -*-
#ifdef GLSL330
out vec4 fragColor;
#else
#define fragColor gl_FragColor
#endif
#ifdef GLSL120
varying vec2 fragTex;
varying float fragStrokeLength;
#else
in vec2 fragTex;
in float fragStrokeLength;
#endif
#ifdef GLSL120
uniform vec4 color;
uniform float feather;
uniform int strokeClosed;
uniform float strokeWidth;
uniform int strokeCap;
uniform int strokeMiterStyle;
uniform float strokeMiterLimit;
#else
layout (std140) uniform Stroke
{
mat4 mvp;
vec4 color;
float feather;
float strokeWidth;
float strokeMiterLimit;
int strokeClosed;
int strokeCap;
int strokeMiterStyle;
};
#endif
float infinity = 1.0 / 0.0;
void main(void) {
if (color.a <= 0.0) {
discard;
}
float hw = strokeWidth / 2.0;
float u = fragTex.x;
float v = fragTex.y;
float dx;
float dy;
float d;
// Stroke caps.
if (u < 0 || u > fragStrokeLength) {
if (u < 0) {
dx = abs(u);
} else {
dx = u - fragStrokeLength;
}
dy = abs(v);
if (strokeCap == 0) { // none
d = infinity;
} else if (strokeCap == 1) { // butt (huh huh)
d = max(dx + hw - 2 * feather, dy);
} else if (strokeCap == 2) { // square
d = max(dx, dy);
} else if (strokeCap == 3) { // round
d = sqrt(dx * dx + dy * dy);
} else if (strokeCap == 4) { // triangle out
d = dx + dy;
} else if (strokeCap == 5) { // triangle in
d = max(dy, hw - feather + dx - dy);
}
// Stroke inner/join
} else {
d = abs(v);
}
if(d <= hw) {
fragColor = color;
} else {
vec4 c = vec4(color.rgb, color.a * (1.0 - ((d - hw) / feather)));
if (c.a <= 0.0) {
discard;
}
fragColor = c;
}
}
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