webgl-raub/examples/aligned.mjs at master · node-3d/webgl-raub · GitHub

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import Image from 'image-raub';
import glfw from 'glfw-raub';
const { Document } = glfw;

import gl from '../index.js';
import { mat4 } from './utils/glMatrix-0.9.5.min.js';
import { alignedShaders } from './utils/presets.mjs';
import { buildShader } from './utils/build-shader.mjs';


const vertices = [
	// Front face
	-1.0, -1.0, 0.5,
	1.0, -1.0, 0.5,
	1.0, 1.0, 0.5,
	-1.0, 1.0, 0.5,
];

const textureCoords = [
	// Front face
	0.0, 0.0,
	1.0, 0.0,
	1.0, 1.0,
	0.0, 1.0,
];

const cubeVertexIndices = [
	0, 1, 2, 0, 2, 3, // Front face
];

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

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

shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, 'aVertexPosition');
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);

shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, 'aTextureCoord');
gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);

shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, 'uPMatrix');
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, 'uMVMatrix');
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, 'uSampler');

const texLena = gl.createTexture();
texLena.image = new Image();
texLena.image.onload = () => {
	console.log(
		`Loaded image: ${texLena.image.src}`,
		`${texLena.image.width}x${texLena.image.height}`,
	);
	gl.bindTexture(gl.TEXTURE_2D, texLena);
	gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
	gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texLena.image);
	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);
};
texLena.image.src = 'img/glass.gif';


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


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

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

const cubeVertexTextureCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureCoords), gl.STATIC_DRAW);
cubeVertexTextureCoordBuffer.itemSize = 2;

const cubeVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
cubeVertexIndexBuffer.numItems = 6;


const drawScene = () => {
	gl.clearColor(0.05, 0.1, 0.05, 1.0);
	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(shaderProgram.vertexPositionAttribute);
	gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);

	mat4.ortho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0, pMatrix);

	mat4.identity(mvMatrix);

	gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
	gl.vertexAttribPointer(
		shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0,
	);

	gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer);
	gl.vertexAttribPointer(
		shaderProgram.textureCoordAttribute, cubeVertexTextureCoordBuffer.itemSize, gl.FLOAT, false, 0, 0,
	);

	gl.activeTexture(gl.TEXTURE0);
	gl.bindTexture(gl.TEXTURE_2D, texLena);
	gl.uniform1i(shaderProgram.samplerUniform, 0);

	gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
	setMatrixUniforms();
	gl.drawElements(gl.TRIANGLES, cubeVertexIndexBuffer.numItems, 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);
};


document.loop(drawScene);