import { project } from '@deck.gl/core';
import { glsl } from "../utils/syntax-tags.js";
const vs = `
uniform vec4 mask_bounds;
uniform bool mask_maskByInstance;
vec2 mask_getCoords(vec4 position) {
return (position.xy - mask_bounds.xy) / (mask_bounds.zw - mask_bounds.xy);
}
`;
const fs = `
uniform sampler2D mask_texture;
uniform int mask_channel;
uniform bool mask_enabled;
uniform bool mask_inverted;
bool mask_isInBounds(vec2 texCoords) {
if (!mask_enabled) {
return true;
}
vec4 maskColor = texture(mask_texture, texCoords);
float maskValue = 1.0;
if (mask_channel == 0) {
maskValue = maskColor.r;
} else if (mask_channel == 1) {
maskValue = maskColor.g;
} else if (mask_channel == 2) {
maskValue = maskColor.b;
} else if (mask_channel == 3) {
maskValue = maskColor.a;
}
if (mask_inverted) {
return maskValue >= 0.5;
} else {
return maskValue < 0.5;
}
}
`;
const inject = {
    'vs:#decl': `
out vec2 mask_texCoords;
`,
    'vs:#main-end': `
vec4 mask_common_position;
if (mask_maskByInstance) {
mask_common_position = project_position(vec4(geometry.worldPosition, 1.0));
} else {
mask_common_position = geometry.position;
}
mask_texCoords = mask_getCoords(mask_common_position);
`,
    'fs:#decl': `
in vec2 mask_texCoords;
`,
    'fs:#main-start': `
if (mask_enabled) {
bool mask = mask_isInBounds(mask_texCoords);
fragColor = texture(mask_texture, mask_texCoords);
if (!mask) discard;
}
`
};
/* eslint-disable camelcase */
const getMaskUniforms = (opts) => {
    if (opts && 'maskMap' in opts) {
        return {
            mask_texture: opts.maskMap
        };
    }
    return {};
};
export default {
    name: 'mask',
    dependencies: [project],
    vs,
    fs,
    inject,
    getUniforms: getMaskUniforms
};