2017-10-23 18:31:42 +00:00
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>TP - WebGL</title>
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<link rel="stylesheet" href="tp.css" type="text/css" media="all">
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<script type="text/javascript" src="webgl-utils.js"></script>
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<script type="text/javascript" src="webgl-debug.js"></script>
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<script type="text/javascript" src="J3DI.js"></script>
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<script type="text/javascript" src="J3DIMath.js"></script>
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<script type="text/javascript" src="main.js"></script>
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<script id="nuanceurSommets" type="x-shader/x-vertex">
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2017-10-23 21:34:21 +00:00
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uniform mat4 mmodel;
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uniform mat4 mview;
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uniform mat4 mproj;
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2017-10-23 18:31:42 +00:00
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uniform vec3 lightDir;
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attribute vec4 vPosition;
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attribute vec4 vColor;
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varying float v_NdotL;
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varying vec4 v_color;
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void main()
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{
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// assigner la position du sommet
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2017-10-23 21:34:21 +00:00
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gl_Position = mproj * mview * mmodel * vPosition;
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2017-10-23 18:31:42 +00:00
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// assigner les coordonnées de texture
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v_color = vColor;
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}
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</script>
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<script id="nuanceurFragments" type="x-shader/x-fragment">
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// informer du degré de précision qu'on veut dans les calculs
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// (Plus à ce sujet: http://stackoverflow.com/questions/5366416/in-opengl-es-2-0-glsl-where-do-you-need-precision-specifiers/6336285#6336285 )
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precision mediump float;
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uniform sampler2D laTexture;
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uniform vec2 positionSouris;
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varying float v_NdotL;
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varying vec4 v_color;
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void main()
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{
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// obtenir la couleur de la texture
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vec4 coul = v_color;
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if ( length( positionSouris - gl_FragCoord.xy ) < 50.0 )
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{
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vec4 coulCercle = vec4( 1.0, 0.0, 0.0, 0.7 );
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coul = coul * (1.0-coulCercle.a) + coulCercle * coulCercle.a;
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// coul = coul * coulCercle; // réponse aussi acceptée
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}
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gl_FragColor = vec4( coul.rgb, coul.a );
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}
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</script>
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</head>
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<body onload="TPdebut()">
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<canvas class="canevas" id="tp-canevas" height="600" width="900">
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Si vous voyez ceci, votre navigateur ne supporte pas webgl.
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</canvas>
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<div class="text">Les <a href="http://www.khronos.org/registry/webgl/specs/latest/1.0/">spécifications de Webgl</a> sont<br>remplies d'informations intéressantes.</div>
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</body>
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</html>
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