export const dashShaders = {
    inject: {
        'vs:#decl': `
in vec2 instanceDashArrays;
in float instanceDashOffsets;
out vec2 vDashArray;
out float vDashOffset;
`,
        'vs:#main-end': `
vDashArray = instanceDashArrays;
vDashOffset = instanceDashOffsets / width.x;
`,
        'fs:#decl': `
uniform float dashAlignMode;
uniform float capType;
uniform bool dashGapPickable;
in vec2 vDashArray;
in float vDashOffset;
`,
        // if given position is in the gap part of the dashed line
        // dashArray.x: solid stroke length, relative to width
        // dashArray.y: gap length, relative to width
        // alignMode:
        // 0 - no adjustment
        // o----     ----     ----     ---- o----     -o----     ----     o
        // 1 - stretch to fit, draw half dash at each end for nicer joints
        // o--    ----    ----    ----    --o--      --o--     ----     --o
        'fs:#main-start': `
float solidLength = vDashArray.x;
float gapLength = vDashArray.y;
float unitLength = solidLength + gapLength;
float offset;
if (unitLength > 0.0) {
if (dashAlignMode == 0.0) {
offset = vDashOffset;
} else {
unitLength = vPathLength / round(vPathLength / unitLength);
offset = solidLength / 2.0;
}
float unitOffset = mod(vPathPosition.y + offset, unitLength);
if (gapLength > 0.0 && unitOffset > solidLength) {
if (capType <= 0.5) {
if (!(dashGapPickable && bool(picking.isActive))) {
discard;
}
} else {
float distToEnd = length(vec2(
min(unitOffset - solidLength, unitLength - unitOffset),
vPathPosition.x
));
if (distToEnd > 1.0) {
if (!(dashGapPickable && bool(picking.isActive))) {
discard;
}
}
}
}
}
`
    }
};
export const offsetShaders = {
    inject: {
        'vs:#decl': `
in float instanceOffsets;
`,
        'vs:DECKGL_FILTER_SIZE': `
float offsetWidth = abs(instanceOffsets * 2.0) + 1.0;
size *= offsetWidth;
`,
        'vs:#main-end': `
float offsetWidth = abs(instanceOffsets * 2.0) + 1.0;
float offsetDir = sign(instanceOffsets);
vPathPosition.x = (vPathPosition.x + offsetDir) * offsetWidth - offsetDir;
vPathPosition.y *= offsetWidth;
vPathLength *= offsetWidth;
`,
        'fs:#main-start': `
float isInside;
isInside = step(-1.0, vPathPosition.x) * step(vPathPosition.x, 1.0);
if (isInside == 0.0) {
discard;
}
`
    }
};