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Stencil test #58

Merged
merged 4 commits into from
Aug 3, 2024
Merged

Stencil test #58

merged 4 commits into from
Aug 3, 2024

Commits on Jul 31, 2024

  1. Implement stencil buffer 

    The stencil functionality is not directly implemented by the GX API, so
we have to emulate it by using an additional TEV stage to mask out the
pixels we don't want to draw and perform some drawing operations on an
offscreen EFB in order to build the stencil buffer in the first place.
    @mardy
    mardy committed Jul 31, 2024
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  2. docs: add section on Stencil test

    @mardy
    mardy committed Jul 31, 2024
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  3. efb: enable color updates when restoring EFB 

    We should not rely on the fact that the _ogx_efb_restore_texobj()
function will only e called when color updates are enabled -- or, at the
very least, if we accept this requirement we should document it. It's
more robust if we always enable color updates within the function and
set the dirty bit, as we do for all other GX settings that we modify.
    @mardy
    mardy committed Jul 31, 2024
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  4. stencil: update stencil buffer before main drawing 

    Draw to the stencil buffer before drawing the graphic primitive,
otherwise the stencil drawing operations which perform a Z-buffer test
(the `zpass` and `zfail` ones set with glStencilOp) will be affected by
it.
When moving the stencil drawing operations before the main drawing,
special care must be taken to avoid using the updated stencil buffer
already when drawing the current primitive (which should be drawn using
the old stencil buffer). We use the `draw_count` variable to achieve
this.
    @mardy
    mardy committed Jul 31, 2024
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