activateRenderTextureAt method
Implementation
void activateRenderTextureAt(RenderTexture renderTexture, int index) {
if (!identical(renderTexture, _activeRenderTextures[index])) {
_activeRenderProgram.flush();
_activeRenderTextures[index] = renderTexture;
renderTexture.activate(this, gl.WebGL.TEXTURE0 + index);
}
}