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color-interleaved.html
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color-interleaved.html
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<!DOCTYPE html>
<html>
<head>
<title>hwshen WebGL — color triangles </title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<!-- ************** Fragment Shader ************* -->
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
varying vec4 vColor;
void main(void) {
gl_FragColor = vColor; // the vColor is interpolated from the vertex colors in the input triangle
}
</script>
<!-- ************** Vertex Shader ************* -->
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition; // two array buffer VBOs - position and color attributes
attribute vec3 aVertexColor;
varying vec4 vColor; // this is a varying which will be interpolated to the fragments
void main(void) {
gl_Position = vec4(aVertexPosition, 1.0);
vColor = vec4(aVertexColor, 1.0); // pass the vertex color as a varying variable
}
</script>
<script type="text/javascript" src="shaders_setup.js"></script>
<script type="text/javascript" src="color-interleaved.js"></script>
</head>
<body onload="webGLStart();">
<canvas id="code02-canvas" style="border: none;" width="700" height="500"></canvas>
<h4> Background: </h4>
<button onclick="BG(1,0,0)"> Red</button>
<button onclick="BG(0,1,0)"> Green</button>
<button onclick="BG(0,0,1)"> Blue</button>
<button onclick="BG(0.5,0.5,0.5)"> Grey</button>
<button onclick="BG(0,0,0)"> Black</button>
<button onclick="BG(1,1,1)"> White</button>
</body>
</html>