Whats a good strat to render bitmap text?
Whats a good strat to render bitmap text?
MAs in setting up the vao and vbos
Lrender the chars to a texture atlas, then pick them out using texcoords
MI already have the atlas, so you recommend generating texture coordinates and geometry instead of say keeping a atlas index instanced vbo and bind it per text render?
Fjust draw instanced quads with tex coords
MProblem with that method is your need to switch the vbo when you need to render more than a single bit of text
MDefinitely want to do that just asking for opinions before implementing
Lare you rendering your game geometry as 2d quads or 3d
M2d
M240x160
Lthen why do you need to change vbo
M8x8 font
MBecause if you have two different lines of text you dont want to \n\n\n\n\n\n\n\n down to where you need to be for example
Myou'd simply specify a new location and have a new dataset
Lwhat
Ljust do normal instanced quad rendering and use that to draw the text
MYes
Mthat allows you to draw a continuous line of text
MNow what about two separate lines of text?
Mcall glDrawElementsInstanced again sure
MBut it will emit the same thing
MReupload to the vbo or switch vbo (which contains the ids into the texture atlas)
Lwhat
Li'm able to draw my whole scene with many lines of text in one call
MHow does it work then? You just have one large buffer of all the text?
Fjust draw quads
Lno
Li just draw quads
Lmy drawing doesn't distinguish text and game objects
Lit's just
Lquads
Fquads with a texture and a specific tex coord
Lyup
Fwe dont do any lines of text shenanigans
Fwe quite literally just draw quads
Lcharacters are just quads
MSo you generate the positions of the quads and the texture coords?
Lno
Lit's instanced
Lwe know the positions and the tex coords of each char
MOkay then how do you render two different bits of text at two different locations?
MAnother draw call surely
Fno
Fjust draw quads
Lno?
Fsomewhere else
L^
Lour renderer just takes in a list of quads
Fdo you make a draw call everytime you need to draw something at a different location
Lthen poops them out on screen
MNo I have an instanced buffer of the locations