the vertex shader determines what position on the screen each vertex is
the vertex shader determines what position on the screen each vertex is
Lonly 16384? pfft
Ait's an arbitrary limit i manually set
Amy engine is a 3D engine so there's no need to waste GPU memory for a bunch of sprites that will never be drawn
Abasically
vertex shader = position
fragment shader = color
vertex shader = position
fragment shader = color
FOH MY GOD
FIM SO HAPPY
FI DID IT
FI CAN DRAW MULTIPLE SHAPES AND I CAN HAVE THEM BE DIFFERENT COLORS
Fi simplified like 270 lines of code into like 15 lines of code
F
F
Five never been more happy to see some basic shapes on my screen
Five also made a thing for the coordinate system to be in pixels instead of floats
Fand instead of coming from the middle
Fthe coordinate system comes from the top left and increases towards the bottom right
Flike most game engines have it cus im used to that
Ayour life will be a lot easier once you get to transformations in the learnopengl tutorial
Fi will definitely read about that
Fdo i even wanna know how to draw a circle
Acircles are a lot harder. you either have to draw lots of small triangles, draw a circle texture, or do what I do which is to use an SDF which is a whole nother thing entirely
Fcould i make a program that basically creates an empty array and then goes along bit by bit by the circumference of the circle until it makes a full circle and comes back to the start
Fand with each iteration it stores that coordinate into the array and then uses that as a buffer
Ayou have to make sure it creates triangles
Agenerally for that i'd use a triangulation algorithm. but i don't know, i never even bothered doing that, I just use SDFs
Athe easiest thing to do though is almost certainly going to be to create a texture CPU side and then draw it
Awon't be particularly fast but the other two ways are vastly more complicated
Fah shit
F
Fon that note
Fmoving on to drawing textures
Ahttps://github.com/skyebird189/Silk.NET/blob/samples-textures/examples/CSharp/OpenGL%20Tutorials/Tutorial%201.3%20-%20Textures/Program.cs take a look at my fork, I've written a texture tutorial that doesn't use the GL abstractions
Ftheres a way to use gl abstractions????
F
Awell yes
i myself have written an abstraction layer over both GL and directx, but that is separate to these tutorials
but all the abstractions in these tutorials do is reduce some of the boilerplate, you still have to write the GL stuff yourself
i myself have written an abstraction layer over both GL and directx, but that is separate to these tutorials
but all the abstractions in these tutorials do is reduce some of the boilerplate, you still have to write the GL stuff yourself
Fso what should i do
Fwith or without abstractions
Ai've adjusted the tutorials so it teaches you textures first and then does the abstractions and that's the way i'd personally advise learning it
Fwait
Ftextures
Falso need a vbo and ebo and all that?
Ano
Fcan i use the same ones
Ai'd suggest taking a look at the tutorial it explains basically everything that needs to be added and changed
Fand the vao
Abecause it's an extension to the "drawing a quad" tutorial you see on the website
Aso it still contains all the code from it
Athe bits that are heavily commented are the new bits
Fokay ill take a look
Fis there a version wihtout the quad part