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Migrate to WebGL2 to use VAOs (might be fun)

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This commit is contained in:
keanutaufan 2024-09-18 22:16:18 +07:00
parent da90785ff3
commit ecfe53f705
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GPG Key ID: 0E2EF5BE1DA75288
4 changed files with 24 additions and 10 deletions
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15
src/main.ts
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@ -16,14 +16,16 @@ function render() {
throw new Error("Canvas does not exist");
}
const gl = canvas.getContext("webgl");
const gl = canvas.getContext("webgl2");
if (!gl) {
throw new Error("This browser does not support WebGL");
throw new Error("This browser does not support WebGL 2");
}
const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vsSource);
const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fsSource);
const program = loadProgram(gl, vertexShader, fragmentShader);
gl.useProgram(program);
const vertexPositionAttribLocation = gl.getAttribLocation(program, "vertexPosition");
if (vertexPositionAttribLocation < 0) {
@ -33,7 +35,14 @@ function render() {
const verts = new Float32Array(triangle.vertices);
const buffer = loadBuffer(gl, verts);
drawVertex(gl, program, vertexPositionAttribLocation, buffer, gl.TRIANGLES, verts.length);
const fragmentColor = gl.getUniformLocation(program, "uColor");
if (!fragmentColor) {
throw new Error("Uniform uColor not found");
}
gl.uniform4f(fragmentColor, 0.22745, 0.35294, 0.25098, 1.0);
drawVertex(gl, vertexPositionAttribLocation, buffer, gl.TRIANGLES, verts.length);
}
try {

9
src/shaderUtils.ts
View File

@ -1,4 +1,4 @@
export function loadShader(gl: WebGLRenderingContext, type: GLenum, source: string) {
export function loadShader(gl: WebGL2RenderingContext, type: GLenum, source: string) {
const shader = gl.createShader(type);
if (!shader) {
throw new Error("WebGL fails to create shader for given type");
@ -16,7 +16,7 @@ export function loadShader(gl: WebGLRenderingContext, type: GLenum, source: stri
}
export function loadProgram(gl: WebGLRenderingContext, vertexShader: WebGLShader, fragmentShader: WebGLShader) {
export function loadProgram(gl: WebGL2RenderingContext, vertexShader: WebGLShader, fragmentShader: WebGLShader) {
const program = gl.createProgram();
if (!program) {
throw new Error("WebGL fails to create program");
@ -35,11 +35,10 @@ export function loadProgram(gl: WebGLRenderingContext, vertexShader: WebGLShader
}
export function drawVertex(gl: WebGLRenderingContext, program: WebGLProgram, vertexAttribArrayLocation: GLuint, buffer: WebGLBuffer, mode: GLenum, length: number) {
export function drawVertex(gl: WebGL2RenderingContext, vertexAttribArrayLocation: GLuint, buffer: WebGLBuffer, mode: GLenum, length: number) {
gl.clearColor(0.1, 0.1, 0.1, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.useProgram(program);
gl.enableVertexAttribArray(vertexAttribArrayLocation);
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
@ -56,7 +55,7 @@ export function drawVertex(gl: WebGLRenderingContext, program: WebGLProgram, ver
}
export function loadBuffer(gl: WebGLRenderingContext, vertices: Float32Array) {
export function loadBuffer(gl: WebGL2RenderingContext, vertices: Float32Array) {
const buffer = gl.createBuffer();
if (!buffer) {
throw new Error("WebGL fails to create buffer");

6
src/shaders/basic.frag
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@ -1,5 +1,9 @@
#version 300 es
precision mediump float;
uniform vec4 uColor;
out vec4 fragColor;
void main() {
gl_FragColor = vec4(0.22745, 0.35294, 0.25098, 1.0);
fragColor = uColor;
}

4
src/shaders/basic.vert
View File

@ -1,5 +1,7 @@
#version 300 es
precision mediump float;
attribute vec2 vertexPosition;
in vec2 vertexPosition;
void main() {
gl_Position = vec4(vertexPosition, 0.0, 1.0);