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142 lines
4.1 KiB
142 lines
4.1 KiB
import { mat4, vec3, vec4 } from "gl-matrix";
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import { Corner, GAT, Tile } from "../format/gat";
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import { createProgram, createShader, ShaderType } from "../util/render";
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/* @ts-ignore */
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import fragmentSource from "./gat.frag";
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/* @ts-ignore */
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import vertexSource from "./gat.vert";
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const UP = vec3.fromValues(0, 1, 0);
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export const renderGAT = (gl: WebGLRenderingContext, gat: GAT) => {
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console.log("gat", gat);
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gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
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gl.clearColor(0, 0, 0, 1);
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gl.clear(gl.COLOR_BUFFER_BIT);
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const fragmentShader = createShader(gl, ShaderType.FRAGMENT, fragmentSource);
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const vertexShader = createShader(gl, ShaderType.VERTEX, vertexSource);
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const program = createProgram(gl, vertexShader, fragmentShader);
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gl.useProgram(program);
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gl.enable(gl.DEPTH_TEST);
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const maxAltitude = getMaxAltitude(gat);
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console.log("altitude", maxAltitude);
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const camera = vec3.fromValues(
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gat.width / 2,
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maxAltitude + 10,
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gat.height / 2
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);
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console.log("camera", camera);
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const centerX = Math.floor(gat.width / 2);
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const centerZ = Math.floor(gat.height / 2);
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const centerTile = gat.tiles[gat.width * centerZ + centerX];
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const center = vec3.fromValues(centerX, avgTileHeight(centerTile), centerZ);
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console.log("center", center);
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const model = mat4.create();
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mat4.identity(model);
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mat4.translate(model, model, vec3.fromValues(-centerX, 0, -centerZ));
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const view = mat4.create();
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mat4.lookAt(view, camera, center, UP);
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const perspective = mat4.create();
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const aspect = gl.canvas.clientWidth / gl.canvas.clientHeight;
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mat4.perspective(perspective, Math.PI / 4, aspect, 0.5, 2000);
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const matrix = mat4.create();
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mat4.multiply(matrix, view, model);
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mat4.multiply(matrix, perspective, matrix);
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const matrixLoc = gl.getUniformLocation(program, "u_matrix");
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gl.uniformMatrix4fv(matrixLoc, false, matrix);
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console.log("model", model);
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console.log("view", view);
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console.log("projection", perspective);
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console.log("matrix", matrix);
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const vertices: number[] = [];
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gat.tiles.forEach((tile, i) => {
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const x = i % gat.width;
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const z = Math.floor(i / gat.width);
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const topLeft = [x, tile.altitude[Corner.TOP_LEFT], z];
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const topRight = [x + 1, tile.altitude[Corner.TOP_RIGHT], z];
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const bottomLeft = [x, tile.altitude[Corner.BOTTOM_LEFT], z + 1];
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const bottomRight = [x + 1, tile.altitude[Corner.BOTTOM_RIGHT], z + 1];
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vertices.push(
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...topLeft,
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...bottomLeft,
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...topRight,
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...topRight,
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...bottomLeft,
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...bottomRight
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);
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});
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let failCount = 0;
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for (let i = 0; i < vertices.length / 3; ++i) {
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const vec = vec3.fromValues(vertices[i], vertices[i + 1], vertices[i + 2]);
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const result = checkPixelCoord(vec, matrix);
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if (result) {
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if (failCount < 10) {
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console.log(vec);
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console.log(result);
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}
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failCount++;
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}
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}
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console.log("failCount", failCount);
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console.log("totalCount", vertices.length / 3);
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const positionLoc = gl.getAttribLocation(program, "a_position");
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const vertexBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
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gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
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gl.enableVertexAttribArray(positionLoc);
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gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
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gl.vertexAttribPointer(positionLoc, 3, gl.FLOAT, false, 0, 0);
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gl.drawArrays(gl.TRIANGLES, 0, vertices.length / 3);
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};
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const checkPixelCoord = (x: vec3, mat: mat4): vec4 | null => {
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const vec = vec4.fromValues(x[0], x[1], x[2], 1);
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vec4.transformMat4(vec, vec, mat);
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for (let i = 0; i < vec.length; ++i) {
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if (Math.abs(vec[i]) >= 1) {
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return vec;
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}
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}
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return null;
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};
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const getMaxAltitude = (gat: GAT): number =>
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gat.tiles.reduce(
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(max, tile) =>
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Object.values(tile.altitude).reduce(
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(max1, altitude) => Math.max(max1, altitude),
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max
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),
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0
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);
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const avgTileHeight = (tile: Tile): number => {
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const heights = [...Object.values(tile.altitude)];
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const s = heights.reduce((x, y) => x + y, 0);
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return s / heights.length;
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};
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