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Commit | Line | Data |
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1 | /** | |
2 | * Initializes the WebGL Shader program | |
3 | */ | |
4 | export function initializeShaderProgram(gl, vertexShaderSource, fragmentShaderSource) { | |
5 | ||
6 | const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vertexShaderSource); | |
7 | const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fragmentShaderSource); | |
8 | ||
9 | const shaderProgram = gl.createProgram(); | |
10 | gl.attachShader(shaderProgram, vertexShader); | |
11 | gl.attachShader(shaderProgram, fragmentShader); | |
12 | ||
13 | gl.linkProgram(shaderProgram); | |
14 | ||
15 | if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) { | |
16 | console.error(`Unable to initialize shader program: ${gl.getProgramInfoLog(shaderProgram)}`); | |
17 | return null; | |
18 | } | |
19 | ||
20 | return shaderProgram; | |
21 | } | |
22 | ||
23 | /** | |
24 | * Initializes the buffers | |
25 | */ | |
26 | export function initializeBuffers(gl) { | |
27 | ||
28 | const positionBuffer = gl.createBuffer(); | |
29 | ||
30 | gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer); | |
31 | ||
32 | return { | |
33 | position: positionBuffer | |
34 | }; | |
35 | } | |
36 | ||
37 | ||
38 | /** | |
39 | * Loads and compiles a shader | |
40 | */ | |
41 | function loadShader(gl, type, source) { | |
42 | ||
43 | const shader = gl.createShader(type); | |
44 | gl.shaderSource(shader, source); | |
45 | gl.compileShader(shader); | |
46 | ||
47 | if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) { | |
48 | console.error(`Unable to compile shader: ${gl.getShaderInfoLog(shader)}`); | |
49 | gl.deleteShader(shader); | |
50 | return null; | |
51 | } | |
52 | ||
53 | return shader; | |
54 | } |