[Scummvm-tracker] [ScummVM :: Bugs] #15500: TINYGL: Increased memory usage for textures with bilinear filtering

[ScummVM :: Bugs]

#15500: TINYGL: Increased memory usage for textures with bilinear filtering
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Reporter:  ccawley2011  |      Owner:  (none)
    Type:  defect       |     Status:  new
Priority:  normal       |  Component:  Engine: Grim
 Version:               |   Keywords:  tinygl memory
    Game:               |
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 The bilinear filtering code in TinyGL has this comment:

 {{{
 // Bilinear: each texture coordinates corresponds to the 4 original image
 // pixels linear interpolation has to work on, so that they are near each
 // other in CPU data cache, and a single actual memory fetch happens. This
 // allows applying linear filtering at render time at a very low
 performance
 // cost. As we expect to work on small-ish textures (512*512 ?) the 4x
 memory
 // usage increase should be negligible.
 }}}

 The memory usage increase is quite noticeable on platforms with less RAM,
 since a single 512*512 texture goes from requiring 1 MB to 4 MB. It also
 involves converting the texture to 32 bits per pixel, which results in a
 16x memory increase for paletted textures which could be as small as 256
 KB for a 512x512 texture.
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Ticket URL: <https://bugs.scummvm.org/ticket/15500>
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