method activate

Source

@override
void activate(RenderContextWebGL renderContext) {

  super.activate(renderContext);

  renderingContext.uniform1i(uniforms["uSampler"], 0);

  renderBufferVertex.bindAttribute(attributes["aVertexPosition"], 2, 20, 0);
  renderBufferVertex.bindAttribute(attributes["aVertexTextCoord"], 2, 20, 8);
  renderBufferVertex.bindAttribute(attributes["aVertexAlpha"], 1, 20, 16);
}