Since this might be vendor-specific behavior, a new API function to configure the X/Y texel offsets has been added.
Signed-off-by: Kai Blaschke <kai.blaschke@kb-dev.net>
Setting a custom frame time will result in stable animation speeds if projectM does not render at real-time speeds, e.g. while encoding a video from an audio file as fast as possible.
Since we're using OpenGL, everything has to be done in the same thread anyways. Besides that, the actual "multithreading" implementation was basically starting an empty thread that did absolutely nothing, then wait synchronously for it to complete and join it on the next frame.
Consolidated audio processing code into the PCM class, removing the BeatDetect class in the process. Beat detection now uses the same algorithm as Milkdrop, passing the proper relative bass/mid/treb values to presets. Makes many presets look less jumpy/flickering, as the values are now (smoothly) alternating around 1.0.
Updating frame audio is now done in a function that must specifically be called. Any subsequent calls to GetFrameAudioData() will then return the exact same copy of the audio data. As of now with the exception that new waveform data may be passed in via a separate thread, which will then be returned and might not match the spectrum data. Will fix that in a later commit.
This avoids two fullscreen draw calls during transitions, and should also be slightly faster than using glBlitFramebuffer().
As with all drawing operations, we currently don't really care about the target framebuffer size or aspect ratio and just draw a quad over the whole viewport.
This makes hard transitions a bit "smoother", as they won't always start from a black screen. Not really noticeable with fast presets, but some slow-warping ones will now gently dissolve the previous image.
Milkdrop shaders are now read from .vert/.frag and .inc files, then copied into a generated code file by CMake. Makes editing easier, as many IDEs can properly syntax-highlight the shader code.
The class was also moved into MilkdropPreset, as it's the only preset type which will ever make use of those shaders.
Deleted the now fully "dissolved" ShaderEngine class.
Fixed a transpile issue with a hack used by some preset authors to set a texture sampler to a different filter/wrap mode, removing the "sampler_state" block entirely now as there's no GLSL equivalent (samplers are solely configured on the application side).
Also consolidated a few vertex types into RenderItem and fixed a few old-school effects like DarkenCenter.
Moved per-pixel mesh texture coordinate calculations into the vertex shader. This is probably more performant than the SSE2 code in the old PresetFrameIO class, as the GPU is better at running this stuff in parallel.
All the texture management also needs some refactoring, so now that I've already broken everything, I can just do it as well.
Now using Milkdrop's DX9 coordinate system for all vertex positions and have the vertex shader take care of transforming these into the OpenGL screen space. Makes calculations easier.
Also continued implementing per-pixel mesh and shader stuff.
Requires a general rewrite of the Milkdrop preset code. Previous implementation was tightly integrated into the code parser, so reusing this code wasn't possible. Additional refactoring was done, finished converting custom wave/shape implementations to use the new expression parser code.
There's still a sudden change between presets halfway through the transitions as the shaders are swapped, but fixing this would require a larger rewrite of how presets are rendered in the pipeline. Will do this later.
Mesh size is currently so deeply burrowed in the whole preset structure that changing it on the fly is basically impossible. For now, we'll reload the idle preset and reset the whole preset factory class tree to make sure all classes are properly reinitialized. If apps want to change the mesh size after startup, they need to reload the last played preset after changing the mesh size. This will be fixed in the future after the parser/equation compiler rewrite.
Was only possible on startup before, changing the paths required recreating the whole projectM instance. Now, the method will only reset the texture manager, but not the shaders and presets.
Lots of interconnected changes in this commit:
- Removed unnecessary name/author/filename members all over the place.
- Started using exceptions to deliver preset loading and rendering errors to the topmost ProjectM class.
- Added stream loading methods to factories and the base Preset class.
- Added new events for requesting preset switch and telling the user about loading errors.
- Consolidated preset switching logic in ProjectM class a bit.
Also make sure to propagate the changed value to the preset code via the PipelineContext class. Keeping it in the settings struct for now. Storing a dynamic value in settings makes no sense, so it will be removed later.
