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Draw LineStrings using drawElements

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This enables drawing of LineStrings with more than two coordinates.
This commit is contained in:
Tom Payne
2013-05-31 18:26:19 +02:00
parent e260255ce8
commit 45572931a1
1 changed files with 12 additions and 4 deletions
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16
src/ol/renderer/webgl/webglvectorlayer2renderer.js
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@@ -150,19 +150,27 @@ ol.renderer.webgl.VectorLayer2.prototype.renderLineStringCollections =
gl.uniformMatrix4fv(this.lineStringCollectionLocations_.u_modelViewMatrix,
false, this.modelViewMatrix_);
var buf, dim, i, lineStringCollection;
var buf, dim, i, indexBuffer, indices, lineStringCollection;
for (i = 0; i < lineStringCollections.length; ++i) {
lineStringCollection = lineStringCollections[i];
buf = lineStringCollection.buf;
dim = lineStringCollection.dim;
mapRenderer.bindBuffer(goog.webgl.ARRAY_BUFFER, buf);
// FIXME re-use index buffer
// FIXME use mapRenderer.bindBuffer
indices = lineStringCollection.getIndices();
indexBuffer = gl.createBuffer();
gl.bindBuffer(goog.webgl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bufferData(
goog.webgl.ELEMENT_ARRAY_BUFFER, indices, goog.webgl.DYNAMIC_DRAW);
gl.enableVertexAttribArray(this.lineStringCollectionLocations_.a_position);
gl.vertexAttribPointer(this.lineStringCollectionLocations_.a_position, 2,
goog.webgl.FLOAT, false, 4 * dim, 0);
gl.uniform4fv(this.lineStringCollectionLocations_.u_color, [1, 1, 0, 0.75]);
buf.forEachRange(function(start, stop) {
gl.drawArrays(goog.webgl.LINES, start / dim, (stop - start) / dim);
});
gl.drawElements(
goog.webgl.LINES, indices.length, goog.webgl.UNSIGNED_SHORT, 0);
gl.bindBuffer(goog.webgl.ELEMENT_ARRAY_BUFFER, null);
gl.deleteBuffer(indexBuffer);
}
};