Framebuffer Objects

Rather than rendering individual points for each position within our velocity grid we can render this data into a texture using a Framebuffer Object.  Specifying an additional Framebuffer (other than the default OpenGL Framebuffer) can be set up as follows:

Once the FBO is set up and we bind it during rendering, all draw calls will be written to the off-screen buffer and copied to the specified texture.  If the particle grid is rendered at each stage of the velocity and pressure calculation the resulting textures can then be combined to form an animated texture at each time step.  Applying this texture to a surface will make it appear to be fluid-like even though it is only 2D.  With more ability for post processing, rendering to texture seems like a better approach than simply rendering particles as points.