html head head body canvas id canvas width 640 height 480 canvas script use strict const canvas document querySelector canvas const gl canvas getContext webgl abc A const vs vertex shader void main gl_Position vec4 0 0 0 1 center gl_PointSize 120 0 compile the shaders const vertShader gl createShader gl VERTEX_SHADER gl shaderSource vertShader vs gl compileShader vertShader error checking for the vertex shader if gl getShaderParameter vertShader gl COMPILE_STATUS alert vs shader error gl getShaderInfoLog vertShader abc B const fs fragment shader precision highp float void main gl_FragColor vec4 1 0 0 1 red const fragShader gl createShader gl FRAGMENT_SHADER gl shaderSource fragShader fs gl compileShader fragShader error checking for the vertex shader if gl getShaderParameter fragShader gl COMPILE_STATUS alert fs shader error gl getShaderInfoLog fragShader setup GLSL program abc C const program gl createProgram gl attachShader program vertShader gl attachShader program fragShader gl linkProgram program gl useProgram program const offset 0 const count 1 abc D gl drawArrays gl POINTS offset count script body html

precision highp float void main gl_FragColor vec4 1 0 0 1 red const fragShader gl createShader gl FRAGMENT_SHADER gl shaderSource fragShader fs gl compileShader fragShader error checking for the vertex shader if gl getShaderParameter fragShader gl COMPILE_STATUS alert fs shader error gl getShaderInfoLog fragShader setup GLSL program abc C const program gl createProgram gl attachShader program vertShader gl attachShader program fragShader gl linkProgram program gl useProgram program const offset 0 const count 1 abc D gl drawArrays gl POINTS offset count script body html

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