Commit Graph

5 Commits

Author SHA1 Message Date
Stenzek f039149198 Move most backend functionality to VideoCommon 2019-02-19 16:57:54 +10:00
Michael Maltese 53224d41d0 OGL: only create stencil buffer when needed 2017-03-15 17:41:33 -07:00
Michael Maltese ba6e917b49 OGL: implement Bounding Box on systems w/o SSBO
This commit should have zero performance effect if SSBOs are supported.

If they aren't (e.g. on all Macs), this commit alters FramebufferManager
to attach a new stencil buffer and VertexManager to draw to it when
bounding box is active. `BBoxRead` gets the pixel data from the buffer
and dumbly loops through it to find the bounding box.

This patch can run Paper Mario: The Thousand-Year Door at almost full
speed (50–60 FPS) without Dual-Core enabled for all common bounding
box-using actions I tested (going through pipes, Plane Mode, Paper
Mode, Prof. Frankly's gate, combat, walking around the overworld, etc.)
on my computer (macOS 10.12.3, 2.8 GHz Intel Core i7, 16 GB 1600 MHz
DDR3, and Intel Iris 1536 MB).

A few more demanding scenes (e.g. the self-building bridge on the way
to Petalburg) slow to ~15% of their speed without this patch (though
they don't run quite at full speed even on master). The slowdown is
caused almost solely by `glReadPixels` in `OGL::BoundingBox::Get`.

Other implementation ideas:

- Use a stencil buffer that's separate from the depth buffer. This would
  require ARB_texture_stencil8 / OpenGL 4.4, which isn't available on
  macOS.

- Use `glGetTexImage` instead of `glReadPixels`. This is ~5 FPS slower
  on my computer, presumably because it has to transfer the entire
  combined depth-stencil buffer instead of only the stencil data.
  Getting only stencil data from `glGetTexImage` requires
  ARB_texture_stencil8 / OpenGL 4.4, which (again) is not available on
  macOS.

- Don't use a PBO, and use `glReadPixels` synchronously. This has no
  visible performance effect on my computer, and is theoretically
  slower.
2017-03-15 17:41:32 -07:00
Pierre Bourdon 3570c7f03a Reformat all the things. Have fun with merge conflicts. 2016-06-24 10:43:46 +02:00
degasus c211450b99 OGL: implement bounding box support with ssbo
This implemention tries to be as accurate as the old SW implemention, but it will remove the dependcy of our vertexloader on videosw.
2014-11-17 21:20:32 +01:00