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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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