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heightmap selection - refactor, make generation immutable to get predictable result

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Azgaar 2022-05-29 22:11:32 +03:00
parent 4f372c7a46
commit 662163176b
12 changed files with 197 additions and 158 deletions
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73
modules/heightmap-generator.js
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@ -1,47 +1,48 @@
"use strict";
window.HeightmapGenerator = (function () {
let grid = null;
let heights = null;
let blobPower;
let linePower;
const setHeights = (savedHeights, cellsNumber) => {
heights = savedHeights;
blobPower = getBlobPower(cellsNumber);
linePower = getLinePower(cellsNumber);
const setGraph = graph => {
const {cellsDesired, cells, points} = graph;
heights = cells.h || createTypedArray({maxValue: 100, length: points.length});
blobPower = getBlobPower(cellsDesired);
linePower = getLinePower(cellsDesired);
grid = graph;
};
const resetHeights = () => {
heights = new Uint8Array(grid.points.length);
const cellsNumber = +byId("pointsInput").dataset.cells;
blobPower = getBlobPower(cellsNumber);
linePower = getLinePower(cellsNumber);
};
const getHeights = () => heights;
const cleanup = () => (heights = null);
const clearData = () => {
heights = null;
grid = null;
};
const fromTemplate = template => {
const templateString = heightmapTemplates[template]?.template || "";
const fromTemplate = (graph, id) => {
const templateString = heightmapTemplates[id]?.template || "";
const steps = templateString.split("\n");
if (!steps.length) throw new Error(`Heightmap template: no steps. Template: ${template}. Steps: ${steps}`);
if (!steps.length) throw new Error(`Heightmap template: no steps. Template: ${id}. Steps: ${steps}`);
setGraph(graph);
for (const step of steps) {
const elements = step.trim().split(" ");
if (elements.length < 2) throw new Error(`Heightmap template: steps < 2. Template: ${template}. Step: ${elements}`);
if (elements.length < 2) throw new Error(`Heightmap template: steps < 2. Template: ${id}. Step: ${elements}`);
addStep(...elements);
}
return heights;
};
const fromPrecreated = id => {
const fromPrecreated = (graph, id) => {
return new Promise(resolve => {
// create canvas where 1px corresponts to a cell
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
const {cellsX, cellsY} = grid;
const {cellsX, cellsY} = graph;
canvas.width = cellsX;
canvas.height = cellsY;
@ -51,7 +52,8 @@ window.HeightmapGenerator = (function () {
img.onload = () => {
ctx.drawImage(img, 0, 0, cellsX, cellsY);
const imageData = ctx.getImageData(0, 0, cellsX, cellsY);
const heights = getHeightsFromImageData(imageData.data);
setGraph(graph);
getHeightsFromImageData(imageData.data);
canvas.remove();
img.remove();
resolve(heights);
@ -59,18 +61,17 @@ window.HeightmapGenerator = (function () {
});
};
const generate = async function () {
Math.random = aleaPRNG(seed);
const generate = async function (graph) {
TIME && console.time("defineHeightmap");
const id = byId("templateInput").value;
resetHeights();
Math.random = aleaPRNG(seed);
const isTemplate = id in heightmapTemplates;
grid.cells.h = isTemplate ? fromTemplate(id) : await fromPrecreated(id);
cleanup();
const heights = isTemplate ? fromTemplate(graph, id) : await fromPrecreated(graph, id);
TIME && console.timeEnd("defineHeightmap");
clearData();
return heights;
};
function addStep(tool, a2, a3, a4, a5) {
@ -141,7 +142,7 @@ window.HeightmapGenerator = (function () {
do {
const x = getPointInRange(rangeX, graphWidth);
const y = getPointInRange(rangeY, graphHeight);
start = findGridCell(x, y);
start = findGridCell(x, y, grid);
limit++;
} while (heights[start] + h > 90 && limit < 50);
@ -177,7 +178,7 @@ window.HeightmapGenerator = (function () {
do {
const x = getPointInRange(rangeX, graphWidth);
const y = getPointInRange(rangeY, graphHeight);
start = findGridCell(x, y);
start = findGridCell(x, y, grid);
limit++;
} while (heights[start] < 20 && limit < 50);
@ -223,7 +224,9 @@ window.HeightmapGenerator = (function () {
limit++;
} while ((dist < graphWidth / 8 || dist > graphWidth / 3) && limit < 50);
let range = getRange(findGridCell(startX, startY), findGridCell(endX, endY));
const startCell = findGridCell(startX, startY, grid);
const endCell = findGridCell(endX, endY, grid);
let range = getRange(startCell, endCell);
// get main ridge
function getRange(cur, end) {
@ -305,7 +308,7 @@ window.HeightmapGenerator = (function () {
do {
startX = getPointInRange(rangeX, graphWidth);
startY = getPointInRange(rangeY, graphHeight);
start = findGridCell(startX, startY);
start = findGridCell(startX, startY, grid);
limit++;
} while (heights[start] < 20 && limit < 50);
@ -317,7 +320,7 @@ window.HeightmapGenerator = (function () {
limit++;
} while ((dist < graphWidth / 8 || dist > graphWidth / 2) && limit < 50);
let range = getRange(start, findGridCell(endX, endY));
let range = getRange(start, findGridCell(endX, endY, grid));
// get main ridge
function getRange(cur, end) {
@ -388,8 +391,8 @@ window.HeightmapGenerator = (function () {
const endX = vert ? Math.floor(graphWidth - startX - graphWidth * 0.1 + Math.random() * graphWidth * 0.2) : graphWidth - 5;
const endY = vert ? graphHeight - 5 : Math.floor(graphHeight - startY - graphHeight * 0.1 + Math.random() * graphHeight * 0.2);
const start = findGridCell(startX, startY);
const end = findGridCell(endX, endY);
const start = findGridCell(startX, startY, grid);
const end = findGridCell(endX, endY, grid);
let range = getRange(start, end);
const query = [];
@ -502,20 +505,16 @@ window.HeightmapGenerator = (function () {
}
function getHeightsFromImageData(imageData) {
const heights = new Uint8Array(grid.points.length);
for (let i = 0; i < heights.length; i++) {
const lightness = imageData[i * 4] / 255;
const powered = lightness < 0.2 ? lightness : 0.2 + (lightness - 0.2) ** 0.8;
heights[i] = minmax(Math.floor(powered * 100), 0, 100);
}
return heights;
}
return {
setHeights,
resetHeights,
setGraph,
getHeights,
cleanup,
generate,
fromTemplate,
fromPrecreated,