webgl/examples/textured.ts at master · node-3d/webgl · GitHub

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import { Image } from '@node-3d/image';
import { Document } from '@node-3d/glfw';

import { webgl as gl } from '@node-3d/webgl';
import { mat4 } from './utils/matrix.ts';
import {
	cubeTexCoords,
	cubeVertexIndices,
	cubeVertices,
	texturedShaders,
} from './utils/presets.ts';
import { buildShader } from './utils/build-shader.ts';
import { deg2rad } from './utils/deg2rad.ts';

Document.setWebgl(gl);
const document = new Document({
	vsync: true,
	autoEsc: true,
	autoFullscreen: true,
	title: 'Textured',
});

const shaderProgram = buildShader(texturedShaders);
gl.useProgram(shaderProgram);

type TAttributes = {
	vertexPositionAttribute: number;
	textureCoordAttribute: number;
	pMatrixUniform: WebGLUniformLocation;
	mvMatrixUniform: WebGLUniformLocation;
	samplerUniform: WebGLUniformLocation;
};
const shaderVars: TAttributes = {
	vertexPositionAttribute: gl.getAttribLocation(shaderProgram, 'aVertexPosition'),
	textureCoordAttribute: gl.getAttribLocation(shaderProgram, 'aTextureCoord'),
	pMatrixUniform: gl.getUniformLocation(shaderProgram, 'uPMatrix'),
	mvMatrixUniform: gl.getUniformLocation(shaderProgram, 'uMVMatrix'),
	samplerUniform: gl.getUniformLocation(shaderProgram, 'uSampler'),
};

gl.enableVertexAttribArray(shaderVars.vertexPositionAttribute);
gl.enableVertexAttribArray(shaderVars.textureCoordAttribute);

const neheTexture = gl.createTexture();
const neheTextureImage = new Image();
neheTextureImage.on('load', () => {
	console.log(
		`Loaded image: ${neheTextureImage.src}`,
		`${neheTextureImage.width}x${neheTextureImage.height}`,
	);
	gl.bindTexture(gl.TEXTURE_2D, neheTexture);
	gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, neheTextureImage);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
	gl.bindTexture(gl.TEXTURE_2D, null);
});
neheTextureImage.src = 'img/glass.gif';

const mvMatrix = mat4.create();
const pMatrix = mat4.create();

const setMatrixUniforms = () => {
	gl.uniformMatrix4fv(shaderVars.pMatrixUniform, false, pMatrix);
	gl.uniformMatrix4fv(shaderVars.mvMatrixUniform, false, mvMatrix);

	const error = gl.getError();
	if (error) {
		console.error('setMatrixUniforms():', gl.drawingBufferWidth, gl.drawingBufferHeight, error);
	}
};

const cubeVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(cubeVertices), gl.STATIC_DRAW);
const cubeVertexPositionBufferItemSize = 3;

const cubeVertexTextureCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer);

gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(cubeTexCoords), gl.STATIC_DRAW);
const cubeVertexTextureCoordBufferItemSize = 2;

const cubeVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);

gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
const cubeVertexIndexBufferNumItems = 36;

let xRot = 0;
let yRot = 0;
let zRot = 0;

const drawScene = () => {
	gl.clearColor(0.05, 0.05, 0.1, 1);
	gl.enable(gl.DEPTH_TEST);

	gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
	gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

	gl.useProgram(shaderProgram);
	gl.enableVertexAttribArray(shaderVars.vertexPositionAttribute);
	gl.enableVertexAttribArray(shaderVars.textureCoordAttribute);

	mat4.perspective(45, gl.drawingBufferWidth / gl.drawingBufferHeight, 0.1, 100.0, pMatrix);

	mat4.identity(mvMatrix);

	mat4.translate(mvMatrix, [0.0, 0.0, -5.0]);

	mat4.rotate(mvMatrix, deg2rad(xRot), [1, 0, 0]);
	mat4.rotate(mvMatrix, deg2rad(yRot), [0, 1, 0]);
	mat4.rotate(mvMatrix, deg2rad(zRot), [0, 0, 1]);

	gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
	gl.vertexAttribPointer(
		shaderVars.vertexPositionAttribute,
		cubeVertexPositionBufferItemSize,
		gl.FLOAT,
		false,
		0,
		0,
	);

	gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer);
	gl.vertexAttribPointer(
		shaderVars.textureCoordAttribute,
		cubeVertexTextureCoordBufferItemSize,
		gl.FLOAT,
		false,
		0,
		0,
	);

	gl.activeTexture(gl.TEXTURE0);
	gl.bindTexture(gl.TEXTURE_2D, neheTexture);
	gl.uniform1i(shaderVars.samplerUniform, 0);

	gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
	setMatrixUniforms();
	gl.drawElements(gl.TRIANGLES, cubeVertexIndexBufferNumItems, gl.UNSIGNED_SHORT, 0);

	// Cleanup GL state
	gl.bindTexture(gl.TEXTURE_2D, null);
	gl.bindBuffer(gl.ARRAY_BUFFER, null);
	gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
	gl.useProgram(null);
};

const tick = (now: number) => {
	xRot = 5 * now * 0.001;
	yRot = 3 * now * 0.001;
	zRot = 4 * now * 0.001;

	drawScene();
};

document.loop(tick);