On Tue, 2010-11-30 at 01:51 -0800, Chia-I Wu wrote: > Hi list, > > I have spent the weekend adding OpenVG 1.1 support to Vega state > tracker. The new features added include mask layer support, text > support, and a new color transformation stage. The work can be found > at > > http://cgit.freedesktop.org/~olv/mesa/log/?h=vega-1.1 > > vega-1.1 branch is based on another clean-up branch > > http://cgit.freedesktop.org/~olv/mesa/log/?h=vega-polish > > Vega employs a renderer to submit its rendering commands to the pipe > context. vega-polish branch mainly introduces "states" to renderer. > I feel vega-1.1 is more self-explanatory so I will focus more on > vega-polish. > > The idea of renderer states is that, functions like vgClear or vgMask > submit rendering commands to the pipe context, but they do not want to > go through the standard OpenVG pipeline. Instead of having them > handle the pipe states save/restore, renderer states allows them to > switch the renderer to the specific state they need. For example, > vgClear can then be implemented by > > renderer_clear_begin(renderer); > renderer_clear(renderer, x, y, w, h, color); // clear a rectangle > renderer_clear_end(renderer); > > vgClear does not need to know which pipe states renderer_clear_begin > sets or which pipe states renderer_clear_end restores. Nor should it > care. > > After the addition of renderer states, vega-polish goes on to refactor > the code in a way that finally the renderer no longer depends on > OpenVG states and all pipe context state manipulation is done by the > renderer. This makes the renderer an abraction of the pipe_context > for Vega: > > App -> OpenVG -> renderer -> pipe_context > > The benefits of the changes are that code that handles OpenVG > functions and code that sets pipe_context is no longer mixed. Since > the renderer is an opaque object, its implementation can be changed: > Use a different pipe_context function for an OpenVG function or the > frequency of pipe state changes may be minimized.
There's a lot here, but it looks like a good cleanup & really sorts out the flow of control in that module. Thanks for giving vega some love... Keith _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
