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text instancing

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Illusion
2023-11-24 23:21:08 +02:00
parent 11bca0e5a4
commit 638c67a99e
10 changed files with 197 additions and 77 deletions
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todo.txt
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@@ -4,8 +4,12 @@
and replace them with the screen's currently active resolution
text rendering improvements
- [x] unicode support (allows for non-ascii characters)
- [ ] unicode support (allows for non-ascii characters)
- unicode support removed for the foreseeable future
- [x] atlas texture for text glyphs (this means we only load in one texture for all text)
- [x] better estimation of atlas width and height (currently the generated atlas texture
has a lot of empty space (over 50% of the texture's height))
- ended up just looping over the ascii glyphs and finding the max width and height
- SDF generation allowing for better text scaling (slower but visually better)
- SDF is too slow if we want to support unicode. it's acceptably fast for ascii only though.
@@ -17,4 +21,24 @@ text rendering improvements
Will probably end up using MSDF (if I can get it to work with C lol)
- instanced rendering for text (this means we only have to do one draw call for all text)
- [x] instanced rendering for text (this means we only have to do one draw call for all text)
running into problems. we got the positions to instance correctly but the texture coordinates
are more difficult to work with because we can't just send a texcoord per vertex per instance
- Ended up passing hardcoded texcoords of all glyphs to the shader using a uniform array which allows us to render infinite
instances of text in one draw call without exceeding any buffer limits. Of course this does mean that if we were to support
unicode we'd have to make the uniform array bigger and its size dynamic. So unicode is dropped for now
text tests / iGPU / Non-instaned rendering
- 10 texts / 72 font size
0.8-0.9ms per frame (1200-1300fps)
- 100 texts / 48 font size
1.2-1.3ms per frame (770-830fps)
- 1000 texts / 28 font size
9-9.5ms per frame (105-110fps)
- 10000 texts / 9 font size
80-85ms per frame (12-13fps)