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import Texture from './texture';
import StencilMode from '../gl/stencil_mode';
import DepthMode from '../gl/depth_mode';
import CullFaceMode from '../gl/cull_face_mode';
import {
hillshadeUniformValues,
hillshadeUniformPrepareValues
} from './program/hillshade_program';
import type Painter from './painter';
import type SourceCache from '../source/source_cache';
import type HillshadeStyleLayer from '../style/style_layer/hillshade_style_layer';
import type {OverscaledTileID} from '../source/tile_id';
export default drawHillshade;
function drawHillshade(painter: Painter, sourceCache: SourceCache, layer: HillshadeStyleLayer, tileIDs: Array<OverscaledTileID>) {
if (painter.renderPass !== 'offscreen' && painter.renderPass !== 'translucent') return;
const context = painter.context;
const depthMode = painter.depthModeForSublayer(0, DepthMode.ReadOnly);
const colorMode = painter.colorModeForRenderPass();
const [stencilModes, coords] = painter.renderPass === 'translucent' ?
painter.stencilConfigForOverlap(tileIDs) : [{}, tileIDs];
for (const coord of coords) {
const tile = sourceCache.getTile(coord);
if (tile.needsHillshadePrepare && painter.renderPass === 'offscreen') {
prepareHillshade(painter, tile, layer, depthMode, StencilMode.disabled, colorMode);
} else if (painter.renderPass === 'translucent') {
renderHillshade(painter, tile, layer, depthMode, stencilModes[coord.overscaledZ], colorMode);
}
}
context.viewport.set([0, 0, painter.width, painter.height]);
}
function renderHillshade(painter, tile, layer, depthMode, stencilMode, colorMode) {
const context = painter.context;
const gl = context.gl;
const fbo = tile.fbo;
if (!fbo) return;
const program = painter.useProgram('hillshade');
context.activeTexture.set(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, fbo.colorAttachment.get());
const uniformValues = hillshadeUniformValues(painter, tile, layer);
program.draw(context, gl.TRIANGLES, depthMode, stencilMode, colorMode, CullFaceMode.disabled,
uniformValues, layer.id, painter.rasterBoundsBuffer,
painter.quadTriangleIndexBuffer, painter.rasterBoundsSegments);
}
// hillshade rendering is done in two steps. the prepare step first calculates the slope of the terrain in the x and y
// directions for each pixel, and saves those values to a framebuffer texture in the r and g channels.
function prepareHillshade(painter, tile, layer, depthMode, stencilMode, colorMode) {
const context = painter.context;
const gl = context.gl;
const dem = tile.dem;
if (dem && dem.data) {
const tileSize = dem.dim;
const textureStride = dem.stride;
const pixelData = dem.getPixels();
context.activeTexture.set(gl.TEXTURE1);
context.pixelStoreUnpackPremultiplyAlpha.set(false);
tile.demTexture = tile.demTexture || painter.getTileTexture(textureStride);
if (tile.demTexture) {
const demTexture = tile.demTexture;
demTexture.update(pixelData, {premultiply: false});
demTexture.bind(gl.NEAREST, gl.CLAMP_TO_EDGE);
} else {
tile.demTexture = new Texture(context, pixelData, gl.RGBA, {premultiply: false});
tile.demTexture.bind(gl.NEAREST, gl.CLAMP_TO_EDGE);
}
context.activeTexture.set(gl.TEXTURE0);
let fbo = tile.fbo;
if (!fbo) {
const renderTexture = new Texture(context, {width: tileSize, height: tileSize, data: null}, gl.RGBA);
renderTexture.bind(gl.LINEAR, gl.CLAMP_TO_EDGE);
fbo = tile.fbo = context.createFramebuffer(tileSize, tileSize, true);
fbo.colorAttachment.set(renderTexture.texture);
}
context.bindFramebuffer.set(fbo.framebuffer);
context.viewport.set([0, 0, tileSize, tileSize]);
painter.useProgram('hillshadePrepare').draw(context, gl.TRIANGLES,
depthMode, stencilMode, colorMode, CullFaceMode.disabled,
hillshadeUniformPrepareValues(tile.tileID, dem),
layer.id, painter.rasterBoundsBuffer,
painter.quadTriangleIndexBuffer, painter.rasterBoundsSegments);
tile.needsHillshadePrepare = false;
}
}
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