Using WEBGL to Showcase Your Images: A Step-by-Step Guide

I'm hoping to effortlessly showcase an image on the canvas at specific x and y co-ordinates using WEBGL, but I'm unsure of the process. Must shaders be included along with all other technical details? I've come across code snippets for displaying images, but they seem cumbersome. I'd prefer not to rely on a framework. If feasible, could you please provide comments and explanations on the key sections? My goal is to utilize WEBGL for a 2D tile-based game.

Thank you in advance for your assistance!

javascriptwebgl

Answer №1

A vertex and fragment shader are necessary for this task, but they do not have to be overly complex. My recommendation would be to begin with the example provided by Mozilla, as mentioned by Ido. Once you have it up and running, you can simplify things by removing the 3D elements. Specifically, you can eliminate the uMVPMatrix and uPmatrix, and switch to a 2D coordinate array. In regards to the vertex shader, this translates to:

attribute vec3 aVertexPosition;  
attribute vec2 aTextureCoord;  

varying highp vec2 vTextureCoord;  

void main(void) {  
  gl_Position = vec4(aVertexPosition, 0.0, 1.0);  
  vTextureCoord = aTextureCoord;  
}

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