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OpenGL font rendering #8731

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stormcone opened this issue Feb 22, 2021 · 1 comment
Closed

OpenGL font rendering #8731

stormcone opened this issue Feb 22, 2021 · 1 comment

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@stormcone
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If using font files, the OpenGL driver renders the fonts thinner than the SDL one. Is there a setting or some other thing that I can do to get back the boldness? I tried to set bold in the config file after the font names, but that way the fonts are too bold and pixelated.

Version of OpenTTD

20210222-master-mb67245d71e

Expected result

Similar font appearance as with the SDL driver.

Actual result

Thinner font appearance than with the SDL driver.

$ ./openttd -v sdl -d freetype=2,driver=1
dbg: [freetype] Initialized
dbg: [freetype] Requested 'DejaVu Sans', using 'DejaVu Sans Book'
dbg: [freetype] Requested 'Liberation Sans', using 'Liberation Sans Regular'
dbg: [freetype] Requested 'Liberation Serif', using 'Liberation Serif Regular'
dbg: [driver] Successfully loaded blitter '32bpp-anim'
dbg: [driver] SDL2: Mouse is at (707, 645), use display 0 (0, 0, 1920, 1080)
dbg: [driver] SDL2: using mode 1920x1054
dbg: [driver] SDL2: using driver 'x11'
dbg: [driver] Successfully loaded video driver 'sdl'

$ ./openttd -v sdl-opengl -d freetype=2,driver=1
dbg: [freetype] Initialized
dbg: [freetype] Requested 'DejaVu Sans', using 'DejaVu Sans Book'
dbg: [freetype] Requested 'Liberation Sans', using 'Liberation Sans Regular'
dbg: [freetype] Requested 'Liberation Serif', using 'Liberation Serif Regular'
dbg: [driver] Successfully loaded blitter '32bpp-anim'
dbg: [driver] SDL2: Mouse is at (405, 573), use display 0 (0, 0, 1920, 1080)
dbg: [driver] SDL2: using mode 1920x1054
dbg: [driver] SDL2: using driver 'x11'
dbg: [driver] OpenGL driver: NVIDIA Corporation - GeForce GTX 1050 Ti/PCIe/SSE2 (4.6.0 NVIDIA 460.39)

(Btw. the mono font is missing from the debug output. :))

SDL on the left, SDL-OpenGL on the right:
opentdd_font_render

Config file snippet:

small_font = Liberation Sans
medium_font = DejaVu Sans
large_font = Liberation Serif
mono_font = Liberation Mono
small_size = 12
medium_size = 16
large_size = 26
mono_size = 14
small_aa = true
medium_aa = true
large_aa = true
mono_aa = true

System:
Fedora 33
NVIDIA GeForce GTX 1050 Ti
NVIDIA driver 460.39

Steps to reproduce

  1. Set the config to use font files
  2. Start OpenTTD with -v sdl
  3. Start OpenTTD with -v sdl-opengl
  4. See the difference
@michicc
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michicc commented Feb 23, 2021

Heh, totally forgot about font anti-aliasing. OpenGL video backend is currently causing the 8bpp blitter to be used if you don't load any 32bpp graphics as it is faster.

Fixing that isn't hard, I just wonder whether to force a 32bpp blitter for enabled anti-alias just with OpenGL or in general.

michicc added a commit to michicc/OpenTTD that referenced this issue Feb 23, 2021
@michicc
Fix OpenTTD#8731: Always use a 32bpp blitter if font anti-aliasing is…
38afef6 
… enabled.
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@michicc @stormcone