Game Development Reference
In-Depth Information
-1.0, 0.0, 1.0,
0.0, -height, 0.0,
1.0, 0.0, -1.0,
-1.0, 0.0, -1.0,
0.0, -height, 0.0,
1.0, 0.0, 1.0,
1.0, 0.0, -1.0,
0.0, -height, 0.0,
-1.0, 0.0, 1.0,
-1.0, 0.0, -1.0
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
octahedronVertexPositionBuffer.itemSize = 3;
octahedronVertexPositionBuffer.numItems = 24;
colors = [
[1.0, 0.0, 0.0, 1.0], // red
[0.0, 1.0, 0.0, 1.0], // green
[0.0, 0.0, 1.0, 1.0], // blue
[1.0, 1.0, 0.0, 1.0], // yellow
[1.0, 1.0, 1.0, 1.0], // white
[0.0, 0.0, 0.0, 1.0], // black
[1.0, 0.0, 1.0, 1.0], // magenta
[0.0, 1.0, 1.0, 1.0] // cyan
];
var unpackedColors = [];
//8 colors by 4 channels - rgba
for(var i=0; i < 8; ++i){
for(var k=0; k < 3; ++k){
var color = colors[i];
unpackedColors = unpackedColors.concat(color);
}
}
octahedronVertexColorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, octahedronVertexColorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(unpackedColors),
gl.STATIC_DRAW);
octahedronVertexColorBuffer.itemSize = 4;
octahedronVertexColorBuffer.numItems = 24;
var octahedronVertexIndices = [
//top
0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11,
//bottom
12, 13, 14, 15, 16, 17,
