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html head head body canvas id canvas width 640 height 480 canvas script var canvas document getElementById canvas var gl canvas getContext webgl gl clearColor 0 0 1 0 0 0 1 0 if gl clearDepth gl clearDepth 1 0 else gl clearDepthf 1 0 gl enable gl DEPTH TEST gl enable gl TEXTURING gl enable gl TEXTURE 2D var vssrc attribute vec3 position attribute vec2 coord varying vec2 texCoord void main void gl Position vec4 position 1 0 texCoord coord var fssrc precision mediump float uniform sampler2D texture0 varying vec2 texCoord void main void gl FragColor texture2D texture0 texCoord gl FragColor vec4 1 0 1 0 1 0 1 0 shaders var vs gl createShader gl VERTEX SHADER gl shaderSource vs vssrc gl compileShader vs if gl getShaderParameter vs gl COMPILE STATUS alert gl getShaderInfoLog vs var fs gl createShader gl FRAGMENT SHADER gl shaderSource fs fssrc gl compileShader fs if gl getShaderParameter fs gl COMPILE STATUS alert gl getShaderInfoLog fs var program gl createProgram gl attachShader program vs gl attachShader program fs gl linkProgram program if gl getProgramParameter program gl LINK STATUS alert gl getProgramInfoLog program gl useProgram program Texture var textureWidth 256 var pixels for var i 0 i textureWidth i 1 for var j 0 j textureWidth j 1 var index j textureWidth i 4 pixels index 0 i pixels index 1 Math floor i j 2 pixels index 2 j pixels index 3 255 var texture gl createTexture gl activeTexture gl TEXTURE0 gl bindTexture gl TEXTURE 2D texture const level 0 const internalFormat gl RGBA const width textureWidth const height textureWidth const border 0 const srcFormat gl RGBA const srcType gl UNSIGNED BYTE const pp new Uint8Array pixels gl texImage2D gl TEXTURE 2D level internalFormat width height border srcFormat srcType pp gl generateMipmap gl TEXTURE 2D draw var verts 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 var buffer gl createBuffer gl bindBuffer gl ARRAY BUFFER buffer gl bufferData gl ARRAY BUFFER new Float32Array verts gl STATIC DRAW var position gl getAttribLocation program position gl vertexAttribPointer position 3 gl FLOAT false 0 0 gl enableVertexAttribArray position var texCoordData 0 0 0 01 1 0 0 01 1 0 1 0 0 0 0 01 1 0 1 0 0 0 1 0 var tbuffer gl createBuffer gl bindBuffer gl ARRAY BUFFER tbuffer gl bufferData gl ARRAY BUFFER new Float32Array texCoordData gl STATIC DRAW var texCoord gl getAttribLocation program coord gl vertexAttribPointer texCoord 2 gl FLOAT false 0 0 gl enableVertexAttribArray texCoord var texture0 gl getUniformLocation program texture0 gl uniform1i texture0 0 gl clear gl COLOR BUFFER BIT gl DEPTH BUFFER BIT gl drawArrays gl TRIANGLES 0 verts length 3 script body html

els index 3 255 var texture gl createTexture gl activeTexture gl TEXTURE0 gl bindTexture gl TEXTURE 2D texture const level 0 const internalFormat gl RGBA const width textureWidth const height textureWidth const border 0 const srcFormat gl RGBA const srcType gl UNSIGNED BYTE const pp new Uint8Array pixels gl texImage2D gl TEXTURE 2D level internalFormat width height border srcFormat srcType pp gl generateMipmap gl TEXTURE 2D draw var verts 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 0 5 0 5 0 0 var buffer gl createBuffer gl bindBuffer gl ARRAY BUFFER buffer gl bufferData gl ARRAY BUFFER new Float32Array verts gl STATIC DRAW var position gl getAttribLocation program position gl vertexAttribPointer position 3 gl FLOAT false 0 0 gl enableVertexAttribArray position var texCoordData 0 0 0 01 1 0 0 01 1 0 1 0 0 0 0 01 1 0 1 0 0 0 1 0 var tbuffer gl createBuffer gl bindBuffer gl ARRAY BUFFER tbuffer gl bufferData gl ARRAY BUFFER new Float32Array texCoordData gl STATIC DRAW var texCoord gl getAttribLocation program coord gl vertexAttribPointer texCoord 2 gl FLOAT false 0 0 gl enableVertexAttribArray texCoord var texture0 gl getUniformLocation program texture0 gl uniform1i texture0 0 gl clear gl COLOR BUFFER BIT gl DEPTH BUFFER BIT gl drawArrays gl TRIANGLES 0 verts length 3 script body html

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