static getLineBuffer() {
if (!_lineBuffer) {
_lineBuffer = GLUtil.createVertexBuffer(2, new Float32Array([
-1, 0,
1, 1
]));
}
return _lineBuffer;
}
static getTriBuffer() {
if (!_triBuffer) {
_triBuffer = GLUtil.createVertexBuffer(2, new Float32Array([
0, 1/2,
3/5, -1/2,
-3/5, -1/2
]));
}
return _triBuffer;
}
static getQuadStripBuffer() {
if (!_quadStripBuffer) {
_quadStripBuffer = GLUtil.createVertexBuffer(2, new Float32Array([
-1.0, -1.0,
-1.0, 1.0,
1.0, 1.0,
1.0, -1.0
]));
}
return _quadStripBuffer;
}
static getHexStripBuffer() {
if (!_hexStripBuffer) {
_hexStripBuffer = GLUtil.createVertexBuffer(2, new Float32Array([
1, 0,
0.5, -4/5,
-0.5, -4/5,
-1, 0,
-0.5, 4/5,
0.5, 4/5
]));
}
return _hexStripBuffer;
}
static getFullScreenQuadBuffer() {
if (!this._fsQuadBuffer) {
this._fsQuadBuffer = GLUtil.createVertexBuffer(3, new Float32Array([
-1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
-1.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, -1.0, 0.0,
1.0, 1.0, 0.0
]));
}
return this._fsQuadBuffer;
}
function createParticleUV() {
const width = SIMULATION_WIDTH;
const height = SIMULATION_HEIGHT;
var buffer = [];
for (var y=0; y<height; ++y) {
for (var x=0; x<width; ++x) {
buffer.push(x/width);
buffer.push(y/height);
}
}
const numComponents = 2;
const data = new Float32Array(buffer);
return GLUtil.createVertexBuffer(numComponents, data);
}