GLSL & Shaders Tutorial - Understanding The Syntax And The Idea Behind The Vertex & Fragment Shaders
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- Опубликовано: 28 июл 2024
- By the end of this video, you'll have a solid understanding of the GLSL ES language's syntax. And also the whats and hows behind shaders, the vertex and fragment shaders more precisely.
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Timestamps
00:00 Introduction
00:13 GLSL definition
00:42 Comments
01:01 Variables and constants
01:25 Basic types
02:09 Vectors and matrices
02:51 Vectors
05:05 Matrices
06:13 Samplers
06:27 Arrays
06:53 Structures
07:29 Control flow statements
07:40 Functions
08:41 Storage qualifiers
26:10 Precision qualifiers
10:48 Shaders definition
11:03 Vertex shader
12:24 Fragment shader
13:41 Example 1
17:45 Example 2
22:52 Example 3
25:40 Final words
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Article
waelyasmina.net/articles/glsl...
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The boilerplate that I'm using in my tutorials
github.com/WaelYasmina/ThreeB...
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Links
WebGL, Shaders, Vertex Shader, Fragment Shader, GLSL ES, and WebGPU In A Nutshell
• WebGL, Shaders, Vertex...
Three.js Tutorial For Absolute Beginners
• Three.js Tutorial For ...
Math For Game Devs by Freya Holmér
• Math For Game Devs (2020)
GLSL built-in functions
www.shaderific.com/glsl-funct...
Written version of this tutorial: waelyasmina.net/articles/glsl-and-shaders-tutorial-for-beginners-webgl-threejs/
A few mistakes I made in the video:
05:58 there's a missing dot.
wrong: float f = matB[0]y;
correct: float f = matB[0].y;
08:12 wrong function return.
wrong: return vec2(1.0, 2.0);
correct: return vec2(x, y);
10:38 we can't set precision to vectors and matrices.
wrong: precision highp vec2;
correct: precision highp int;
correct: precision highp sampler2D;
I've struggling to learn GLSL for some years by now.
Your tutorial was the best I've seen in this time.
Very concise and didactic.
Not only that, it really inspired me to take another chance.
Thank you so much for this, dude.
Excellent work!
I'm so thankful for these kind words, thank you Doug I really appreciate it!
me too
great tutorial, I'm stuck with glsl for weeks. This video is really helpful
Man this tutorial was the best one ever! You have done a tremendous job! 👍
Honestly,this was a very simple and easy to understand tutorial. It really helped me and good video. I wanted to code shaders on glsl but I didn't understand it properly now because of the tutorial I have no confusions
you are a great instructor! I am a mechanical engineer with limited js knowledge and your videos helped me build a fun website thank you so much!
this is very useful, thank you!
i watched the whole thing with only some vague knowledge of c and c# but your teaching style made it pretty easy to digest :)
Great to hear!
Nice work, very lucid. The depth and breadth is just right.
I love this tutorial! It's so clear and informative.
Thank you so much for this video - exactly what I was looking for!
Thanks a lot for this tutorial. Cleared a lot of confusions I had with glsl.
Thank you so much for this video! Have been looking for something like this for weeks, there is surprisingly little content about GLSL on youtube.
You're welcome!
Yes there's a shortage in terms of GLSL tutorials but I'll try to make more whenever I learn or come up with something worth making a tutorial on.
Omg.. the most outstanding explanation ever.. been trying to understand shader from other video but this top it all.. tq very much sir
Thank you Wael, very concise and organized presentation!
Glad you think so!
Thanks for the clear explaination!
Good tutorial, gave me all the info I need 👍
Glad it helped!
Thank you! Helped a ton
What an awesome video. Keep going!
Thank you! Will do!
Great job!
Thanks , That tutorial very clear and prefect.
My pleasure!
Great video!
great tutorial, thank you!
You're welcome!
Really excellent - thank you
You're welcome!
thanks , so good video
thankyou for the tutorial!
You're welcome!
@4:44 What are the components for vect.w, vect.a, and vect.q?
You explained the other components for position, Color and Textures, but not for above. TIA
you are a gem.....
All love brother
Thank you so much for this awesome tutorial😍 One problem: when there are different aspect ratio for the mesh and the image.. that image texture got squeezed/stretched. Do you know any solution of that?
You da champ!
Thank you
Finally a good tutorial
Glad you think so!
Very Good Tutorial, you help me understand that vertex shader will execute the same times of the count of the vertices.That is very important.So, how much times will the fragment shader execute? Does it depends on the resolution of the canvas?
Thank you!
Generally speaking 1 fragment = 1 pixel. Thus the fragment shader is executed the number of pixels times.
Sometimes 1 pixel > 1 fragment. Thus the fragment shader is executed more times than the number of pixels.
To understand the logic behind the 2nd case check these out:
stackoverflow.com/questions/68426777/how-many-times-does-the-glsl-fragment-shader-execute-for-one-draw (The answer)
ruclips.net/video/uH1ES8LOrlM/видео.html
PLEASE PLEASE PLEASE DO A FULL COURSEE ON THISS ONEEE
//good vid
Dude, I had this wet dream of me drawing tasty animations with shaders and this video got me to a “good enough” level in 20minutes! Thank you!
Excellent content Wael! Quick question about usage of GLSL: couldn't we simply use Three to do most of what you've created in this video ? Thanks
Thank you Oliver!
You mean the examples? I think it's possible to replicate the 1st example without using GLSL. However when it comes to the color gradient and masking I don't think it is possible as far as I know.
Anyways even though we have the ability to create cool things without GLSL & shaders they still a must learn if you want to create some high level stuff.
Thanks for making shaders a let harrowing concept :)
At 24:10, how come the vec4 know that float effect is v3? I mean we are only putting a sin function in float effect, so isnt it a single value?
effect is actually a single float value since abs(sin(texture.x + u_time)) returns a single float value. You know sin() returns a value between -1 and 1.
vec3(effect) is the same as vec3(effect, effect, effect).
@@WaelYasmina yea I do a lot of p5 animations and sin cos is totally fine with me bro. Thank you very much, again :D
@@WaelYasmina why I was worried is in oneof the shader videos I saw, the uploader got an error in console that was something like, 3 arguments expected 2 supplied.
Something like this.
Wael do you have courses at udemy or any othre platform?? because u should... i want to support you!! Also for anyone trying, on 17:19 substitute like this for a cool example vec3 newPosition = vec3(position.x, position.y, newZ)
You have an amazing font in this video, source may be appreciated
Itim
@@WaelYasmina thanks
maybe, this lession is WebGL (vertex and shader...)?
Indeed
@@WaelYasmina respect you,
OH MY GOD!
🤩
Okay, I know MUCH MUCH more than I did...
But.. I am still lost..
I just seem to have some mental block when it comes to the GL shader stuff..
I might be able to understand it more if there was a "copy/paste GL stuff" and be able to see what the equivalent code would be in JS.. Though, if half of the stuff is doing what I think it's doing, that may not help.
Sad that i can give only one thumb´s up
But your sweet comment is worth dozens of them. Thank you Niklas!
Example 1 shows the power of math in 4 lines of code.
I'm probably the best learner here lol
Nice! 💪
You need to be protected at all costs. 😁
Thank you lol
Lmao 🤣
I feel like I need autism to understand this material.
NOT restricted AT ALL to javascript... glsl is online or offline, has nothing to do with Javascript really.. it's its own language...
Did I say something other than that?
@WaelYasmina No, don't listen to that fool lol
Man, the tutorial is just amazing, but my IQ is jut too low... :D