Fixes rendering at unexpected sizes by first rendering to a render target and then rendering the contents of that render target to the frame buffer instead. This also prevent rendering twice or more, which might cause severe FPS impact.
As OBS Studio locks some mutexes in a different order depending on what actions are being done, using modified_properties for GPU work causes things to freeze in place. Instead have users manually click the refresh button when they changed files in order to prevent this freeze from happening.
Fixes: #118
'Time.x' gets inaccurate if OBS Studio is running for more than two hours, therefore we have to do something to fix it. By allowing the shader code to control when things loop using 'Time.y' (0..1) and 'Time.z' (the number of times 'Time.y' wrapped back to 0), a much more stable animation can be achieved.
Due to render logic required for transitions, some of the render logic is split into an additional function called 'prepare_render'. Additionally the storage for some temporary objects has been removed as it these objects usually do not outlive their rendering time anyway.
Related: #96#95#94#5
Thanks to the workaround in obs::tools, gfx::shader::shader now supports dynamically rebuilding the properties with new properties without crashing OBS Studio. This effectively allows you to have an up to date view of the current parameters for the shader technique.
Additionally with file watching, live development of shaders is possible at very little cost. Currently only file times and size is looked at every 333ms, but in the future it is possible to also watch for file renames and more.
Removes the stutter when re-opening the properties dialog which was caused by recompiling the same exact shader every time this happened. Also paves the way for simple file watching.
