or: create one big buffer, and fill it with multiple shapes
or: create one big buffer, and fill it with multiple shapes
Luploading to the GPU many times is slow
Land you want to do as few draw calls as possible
FOH MY GOD
F
Lin an ideal world your whole scene is drawn with one call to
glDrawXLand for simple 2d apps that is almost always possible
AglDrawLiterallyEverythingPlease 
Fin an ideal world i would understand everything that im doing 
Fto make the switch to gldrawx
Fis it a lot of changes
Lanything you dont understand, look up there
Lgldrawx is not a real function
Lits a placeholder for the family of draw functions
Foh
Lwhether it be glDrawArrays, glDrawElements, or glDrawIndirectDirectXCompatibleArrayElementsShaderFixedFunction
Fhow would i go around drawing everything to one buffer
Falso
Fwouldnty it connect the shapes then?
Fcus theyre all part of the same buffer array
Lyou make a big buffer, and you put multiple shapes in there
Athat's where BufferSubData comes in
Lno
Ldo you use trianglestrip?
Fno
Factually
Lthen no it wont connect the shapes
Leach triangle is discrete
Foh
Flet me look at buffer sub data i have no clue what it does
Fcan i keep everything binded and then unbind it in a cleanup function at the end of the program?
For is there no point unbinding it cus the program will be trashed from memory anyway?
Acontrary to popular belief it is actually wiser (for an OpenGL program) to not delete anything that you know will only be removed when the program closes
Fso its best to not unbind it?
Ain terms of unbinding the only reason to do it is to prevent accidental overwriting of buffers
Aunbinding != deleting
Fohh
Fis there any tutorial on using buffersubdata
Fthis is a bit confusing
Lthere is no need for one, its just a few extra parameters on bufferdata
Ait's just BufferData with an extra parameter
Lthe documentation explains it well
Awhich specifies the offset in the buffer you want to update
Fso do i fix buffersubdata instead of bufferdata
Awhen using BufferSubData, you must first allocate a buffer with BufferData. you don't have to put anything inside the buffer, you just need to make sure you do that
once it's been allocated, you can call BufferSubData as many times as you want
once it's been allocated, you can call BufferSubData as many times as you want
Fwhats the offset
Athis is why you create one large buffer that stores everything you're going to draw
then you use BufferSubData with an offset to update it
then you use BufferSubData with an offset to update it
Fahhhhhhhhh
Fi almost get it
Aoffset in bytes into the buffer