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Document new uniforms (#646)

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* Document new uniforms

* wops.

* Update README.md

* further document new uniforms
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Antonio Orefice 2024-11-19 19:21:07 +01:00 committed by GitHub
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@ -533,6 +533,21 @@ These builtin variables may be part of a UBO block and/or a push constant block.
- FrameCount: a uint variable taking a value which increases by one every frame.
This value could be pre-wrapped by modulo if specified in preset.
This is useful for creating time-dependent effects.
- Rotation: a uint variable with values from 0 to 3 describing the rotation of the content; respectively: 0°,90°,180°,270°
- OriginalAspect: a float value describing the aspect ratio intended by the current core.
- OriginalAspectRotated: a float value that:
Is the same as OriginalAspect for no rotated and 180° rotated content.
Is 1/OriginalAspect for 90° and 270° rotated content.
- OriginalFPS: a float value describing the frame rate set by the core.
- FrameTimeDelta: a uint value describing the time difference (in microseconds) between the previous and the current frame.
#### Checking for builtin uniform variables availability.
It's advisable to check for the availability of specific uniforms before using them in shaders, because this prevents compilation errors when trying to use new uniforms with an older retroarch version.
RetroArch provides the following defines:
- _HAS_ORIGINALASPECT_UNIFORMS: Indicates whether OriginalAspect and OriginalAspectRotated uniforms are available.
- _HAS_FRAMETIME_UNIFORMS: Indicates wheter OriginalFPS and FrameTimeDelta uniforms are available.
#### Aliases
Aliases can give meaning to arbitrary names in a slang file.