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DOCTYPE html html xmlns http www w3 org 1999 xhtml lang en head title WebGL title meta charset utf 8 head body canvas id canvas width 640 height 480 Your browser doesn t appear to support the HTML5 b canvas b element canvas script use strict const gl document querySelector canvas getContext webgl const vssrc vertex shader void main gl Position vec4 0 0 0 1 center gl PointSize 120 0 const fssrc fragment shader precision mediump float uniform sampler2D tex void main gl FragColor texture2D tex gl PointCoord xy setup GLSL program const vertShader gl createShader gl VERTEX SHADER gl shaderSource vertShader vssrc gl compileShader vertShader const fragShader gl createShader gl FRAGMENT SHADER gl shaderSource fragShader fssrc gl compileShader fragShader const prog gl createProgram gl attachShader prog vertShader gl attachShader prog fragShader gl linkProgram prog gl useProgram prog a 2x2 pixel data const pixels new Uint8Array 0xFF 0x00 0x00 0xFF red 0x00 0xFF 0x00 0xFF green 0x00 0x00 0xFF 0xFF blue 0xFF 0x00 0xFF 0xFF cyan const tex gl createTexture gl bindTexture gl TEXTURE 2D tex gl texImage2D gl TEXTURE 2D 0 level gl RGBA internal format 2 width 2 height 0 border gl RGBA format gl UNSIGNED BYTE type pixels data gl texParameteri gl TEXTURE 2D gl TEXTURE MIN FILTER gl NEAREST gl texParameteri gl TEXTURE 2D gl TEXTURE MAG FILTER gl NEAREST gl useProgram prog const offset 0 const count 1 gl drawArrays gl POINTS offset count script body html

l attachShader prog vertShader gl attachShader prog fragShader gl linkProgram prog gl useProgram prog a 2x2 pixel data const pixels new Uint8Array 0xFF 0x00 0x00 0xFF red 0x00 0xFF 0x00 0xFF green 0x00 0x00 0xFF 0xFF blue 0xFF 0x00 0xFF 0xFF cyan const tex gl createTexture gl bindTexture gl TEXTURE 2D tex gl texImage2D gl TEXTURE 2D 0 level gl RGBA internal format 2 width 2 height 0 border gl RGBA format gl UNSIGNED BYTE type pixels data gl texParameteri gl TEXTURE 2D gl TEXTURE MIN FILTER gl NEAREST gl texParameteri gl TEXTURE 2D gl TEXTURE MAG FILTER gl NEAREST gl useProgram prog const offset 0 const count 1 gl drawArrays gl POINTS offset count script body html

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