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Import glMatrix and a simple triangle in WebGL
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Dog. WebGL, JavaScript</title> | |
| </head> | |
| <body> | |
| <canvas id="renderCanvas" width="400" height="300"></canvas> | |
| <script type="importmap"> | |
| { | |
| "imports": { | |
| "gl-matrix": "https://cdn.skypack.dev/[email protected]" | |
| } | |
| } | |
| </script> | |
| <script type="module"> | |
| import { vec3 } from "gl-matrix"; | |
| const gl = document.getElementById("renderCanvas").getContext("webgl"); | |
| gl.clearColor(0.2, 0.2, 0.2, 1); | |
| const vertShaderSrc = | |
| `attribute vec3 aPosition; | |
| void main() { | |
| gl_Position = vec4(aPosition, 1.0); | |
| }`; | |
| const fragShaderSrc = | |
| `precision mediump float; | |
| void main() { | |
| gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); | |
| } | |
| `; | |
| const vShader = gl.createShader(gl.VERTEX_SHADER); | |
| gl.shaderSource(vShader, vertShaderSrc); | |
| gl.compileShader(vShader); | |
| // console.log(gl.getShaderInfoLog(vShader)); | |
| const fShader = gl.createShader(gl.FRAGMENT_SHADER); | |
| gl.shaderSource(fShader, fragShaderSrc); | |
| gl.compileShader(fShader); | |
| // console.log(gl.getShaderInfoLog(fShader)); | |
| const program = gl.createProgram(); | |
| gl.attachShader(program, vShader); | |
| gl.attachShader(program, fShader); | |
| gl.bindAttribLocation(program, 0, "aPosition"); | |
| gl.linkProgram(program); | |
| // console.log(gl.getProgramInfoLog(program)); | |
| gl.useProgram(program); | |
| const vertPositions = [ | |
| -0.5, -0.5, 0, | |
| 0.5, -0.5, 0, | |
| 0, 0.5, 0]; | |
| const vertPosBuffer = gl.createBuffer(); | |
| gl.bindBuffer(gl.ARRAY_BUFFER, vertPosBuffer); | |
| gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertPositions), | |
| gl.STATIC_DRAW); | |
| gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0); | |
| gl.enableVertexAttribArray(0); | |
| gl.clear(gl.COLOR_BUFFER_BIT); | |
| gl.drawArrays(gl.TRIANGLES, 0, 3); | |
| </script> | |
| </body> | |
| </html> |
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