UNLIMITED textures in your Shaders! (OpenGL tutorial)

Рет қаралды 6,393

6 ай бұрын

In this video, I teach you how to use bindless textures in OpenGL. A technique that allows you to have as many textures in your shader programs as you want.
Graphics Hardware checker: opengl.gpuinfo.org/listextens...
BIndless Textures: www.khronos.org/opengl/wiki/B...
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Пікірлер: 31

@GGodis 6 ай бұрын

Thank you for a really interesting and clear tutorial! Can't wait to see more.

@lowlevelgamedev9330 6 ай бұрын

thank you 💪 there will be more tutorials whenever I find interesting stuff like this

@wjrasmussen666 6 ай бұрын

I guess I won't be watching at 2x

@lowlevelgamedev9330 6 ай бұрын

😂😂😂😂 yeah bro that's my slow speed btw

@wraser 6 ай бұрын

😂

@JtagSheep 3 ай бұрын

If you dont care about having to bind textures and dont care about supporting old OpenGL version then you can just use new GL calls like glCreateTextures(GL_TEXTURE_2D, 1, &texId); and glBindTextureUnit(slot, texId); Still giving you tons of textures since you choose what is bound when.

@Finding_Fortune 6 ай бұрын

Cool! I suppose the advantage of this over say a 2D texture array, is that all of the textures could be any size versus a texture array only handles textures of one size?

@lowlevelgamedev9330 6 ай бұрын

yes precisely + for textures arrays I think you need to recreate the array to add a new texture to it

@KropedStudio 5 ай бұрын

ejj we meet again xD

@Finding_Fortune 5 ай бұрын

lol@@KropedStudio

@smugtomato5972 4 ай бұрын

@@lowlevelgamedev9330 No, you can just add data to the buffer with glTexSubImage3D. Assuming you've allocated enough space for your texture array in the first place of course

@PaulSpades Ай бұрын

That's nice and all, but the GPU still has a limited number of TMUs, maybe 8, maybe 256. You are limited to that number, for each draw call, not because openGL wants to limit you, but because that's what the physical hardware is. Second, if you bypass the binding, you don't get access to the most compute intensive function the GPU (at least in games), which the TMU does - the filtered sampling. Bindless textures was a technique developed for feeding compute shaders(or all unified shaders) with arbitrary data. That's what you should use it for. If you want more textures than your player has texture unit hardware, you simply use more shader programs with different texture sets. Game engines typically bundle shader porgrams+textures as a data structure called a material.

@lowlevelgamedev9330 Ай бұрын

this is kinda of a bold claim so I will have to investigate, as far as I know bindless is the modern way to go and for example ID7 engine switched from its mega texture from ID6 (and that thing is not easy to implement) and now they go with a fully deferred material system that uses bindless textures. But I don't use bindless to acces more textures but to be able to draw more without having to bind a different uniform each time, so maybe the title is missleading

@tokyospliff Ай бұрын

Great video man. Why are the handles uvec2 in the fragment shader?

@lowlevelgamedev9330 Ай бұрын

good question, the handle needs to be an unsigned 64 bit int, to acces the texture, however you can't have 64 bit numbers without another extension, so this extension allows you to use a uvec2 aka 2 32 bit ints to use as one 64 bit number

@tokyospliff Ай бұрын

@@lowlevelgamedev9330 Nice, makes sense, I thought it might be something like that, very handy.

@tokyospliff Ай бұрын

@@lowlevelgamedev9330 is the array of handles bound with glBindBufferBase and GL_SHADER_STORAGE_BUFFER?

@jeyko666 4 ай бұрын

The description of residency and nonresidency is wrong. You are not loading anything from memory. You are telling OpenGL driver how to do low level synchronization, same way you do by binding to units.

@lowlevelgamedev9330 4 ай бұрын

thanks I didn't know that, I have to look into it

@TSD_Finance 6 ай бұрын

how much harder is Vulkan then OpenGL? Do most things still apply?

@lowlevelgamedev9330 6 ай бұрын

it is much much more difficult. But yes all graphics apis are very similar and you also have something equivalent in vulkan

@tokyospliff 5 ай бұрын

Ridiculously more difficult, but I do recommend spending 6 months to a year in Vulkan. It forces you to structure things and interact with the GPU efficently and when you return to OpenGL you will be writing much better code because of it.