maplibre-gl/src/render/draw_custom.ts

BSD licensed community fork of mapbox-gl, a WebGL interactive maps library

import {DepthMode} from '../gl/depth_mode';
import {StencilMode} from '../gl/stencil_mode';

import type {Painter} from './painter';
import type {SourceCache} from '../source/source_cache';
import type {CustomStyleLayer} from '../style/style_layer/custom_style_layer';

export function drawCustom(painter: Painter, sourceCache: SourceCache, layer: CustomStyleLayer) {

    const context = painter.context;
    const implementation = layer.implementation;

    if (painter.renderPass === 'offscreen') {

        const prerender = implementation.prerender;
        if (prerender) {
            painter.setCustomLayerDefaults();
            context.setColorMode(painter.colorModeForRenderPass());

            prerender.call(implementation, context.gl, painter.transform.customLayerMatrix());

            context.setDirty();
            painter.setBaseState();
        }

    } else if (painter.renderPass === 'translucent') {

        painter.setCustomLayerDefaults();

        context.setColorMode(painter.colorModeForRenderPass());
        context.setStencilMode(StencilMode.disabled);

        const depthMode = implementation.renderingMode === '3d' ?
            new DepthMode(painter.context.gl.LEQUAL, DepthMode.ReadWrite, painter.depthRangeFor3D) :
            painter.depthModeForSublayer(0, DepthMode.ReadOnly);

        context.setDepthMode(depthMode);

        implementation.render(context.gl, painter.transform.customLayerMatrix(), {farZ: painter.transform.farZ, nearZ: painter.transform.nearZ, fov: painter.transform._fov, modelViewProjectionMatrix: painter.transform.modelViewProjectionMatrix, projectionMatrix: painter.transform.projectionMatrix});

        context.setDirty();
        painter.setBaseState();
        context.bindFramebuffer.set(null);
    }
}