molstar/lib/commonjs/mol-gl/shader/chunks/apply-fog.glsl.js

A comprehensive macromolecular library.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.apply_fog = void 0;
exports.apply_fog = `
float preFogAlpha = gl_FragColor.a;
if (uFog) {
    float viewZ = depthToViewZ(uIsOrtho, fragmentDepth, uNear, uFar);
    float fogFactor = smoothstep(uFogNear, uFogFar, abs(viewZ));
    float fogAlpha = (1.0 - fogFactor) * gl_FragColor.a;
    if (!uTransparentBackground) {
        if (gl_FragColor.a < 1.0) {
            // transparent objects are blended with background color
            gl_FragColor.a = fogAlpha;
        } else {
            // mix opaque objects with background color
            gl_FragColor.rgb = mix(gl_FragColor.rgb, uFogColor, fogFactor);
        }
    } else {
        #if defined(dRenderVariant_colorDpoit) && !defined(dGeometryType_directVolume)
            if (gl_FragColor.a < 1.0) {
                // transparent objects are blended with background color
                gl_FragColor.a = fogAlpha;
            } else {
                // opaque objects need to be pre-multiplied alpha
                gl_FragColor.rgb *= fogAlpha;
                gl_FragColor.a = fogAlpha;
            }
        #else
            // pre-multiplied alpha expected for transparent background
            gl_FragColor.rgb *= fogAlpha;
            gl_FragColor.a = fogAlpha;
        #endif
    }
} else if (uTransparentBackground) {
    #if !defined(dRenderVariant_colorDpoit) && !defined(dGeometryType_directVolume)
        // pre-multiplied alpha expected for transparent background
        gl_FragColor.rgb *= gl_FragColor.a;
    #endif
}
`;