Components of a vector can be accessed via vec.xwhere x is the first component of the vector. You can use .x, .y, .z and .w to access their first, second, third and fourth component respectively. GLSL also allows you to use rgba for colors or stpq for texture coordinates, accessing the same components.

Tony Nemo

Shaders & GLSL

notes + algo + examples + experiments

programming

#CS

#openGl

shaders

creative coding

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Shaders are also very isolated programs in that they're not allowed to communicate with each other; the only communication they have is via their inputs and outputs.

Tony Nemo

Shaders always begin with a version declaration, followed by a list of input and output variables, uniforms and its main function. Each shader's entry point is at its main function where we process any input variables and output the results in its output variables

Tony Nemo

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Tony Nemo

GLSL types

Tony Nemo

GLSL Vector Container A vector in GLSL is a 1,2,3 or 4 component container for any of the basic types just mentioned. They can take the following form (n represents the number of components)

Tony Nemo

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The vector datatype allows for some interesting and flexible component selection called swizzling. Swizzling allows for the following syntax:

Tony Nemo

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We can also pass vectors as arguments to different vector constructor calls, reducing the number of arguments required:

Tony Nemo

ins and outs Shaders are nice little programs on their own, but they are part of a whole and for that reason we want to have inputs and outputs on the individual shaders so that we can move stuff around. GLSL defined the in and out keywords specifically for that purpose.

Tony Nemo

ins and outs 2 Each shader can specify inputs and outputs using those keywords and wherever an output variable matches with an input variable of the next shader stage they're passed along. The vertex and fragment shader differ a bit though

Tony Nemo

If we want to send data from one shader to the other we'd have to declare an output in the sending shader and a similar input in the receiving shader. When the types and the names are equal on both sides OpenGL will link those variables together and then it is possible to send data between shaders

Tony Nemo

Uniforms Uniforms are another way to pass data from our application on the CPU to the shaders on the GPU

Tony Nemo

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To declare a uniform in GLSL we simply add the uniform keyword to a shader with a type and a name. From that point on we can use the newly declared uniform in the shader. Let's see if this time we can set the color of the triangle via a uniform

Tony Nemo

If you declare a uniform that isn't used anywhere in your GLSL code the compiler will silently remove the variable from the compiled version which is the cause for several frustrating errors; keep this in mind!

attention

Tony Nemo

You're always at war with the guy on the other bench. You pick up their patterns. That's what I got the most out of this year. I know what other coaches like to do.

Isaiah Thomas

There are examples of ex-presidents speaking out. Jimmy Carter has not held back on a variety of issues. Harry Truman didn't.

Robert Dallek

Punk allowed women to stop looking feminine. Oh, the relief.

Jo Brand

It was only when I realized how actors have the power to move people that I decided to pursue acting as a career.

Cate Blanchett

When I was a kid, I never thought about anything. Never had to think about where I was going to school or what I was going to do. I just lived minute to minute.

Larry Bird

I am sort of an adventurer. I like to explore new places. I don't get to travel as often as I would like but I love it.

Edi Gathegi

The act is truth. Nothing that was ever recorded is truth. Nothing that was ever said is truth. Only the act.

Jack Bowman

Edward Heath and Richard Nixon took personal awkwardness with each other to new and excruciating levels.

David Cameron

I'm kind of a homebody. I like to sit at home and watch movies and eat good food.

Emilie de Ravin

Most of my confidence came from being with ladies, because I certainly wasn't getting any acting jobs.

Vin Diesel

I admire natural, untouched beauty.

Theophilus London

There's nothing less funny than someone who looks cool. There's nothing more unappealing.

Eric Wareheim

I'm really nearsighted, which has served me well.

Kat Dennings

One great building does not make a great city.

Thomas Heatherwick

Happiness is a carnival game. Its never as easy as it looks but the dumb ones always seem to be walking around with a big stuffed animal.

Dov Davidoff

Sometimes in the midst of all your boy drama you just need a cupcake.

Susane Colasanti

But I have a list of books that I want to read before I die, and whenever I get time to read something that isn't a script, I'll read something from that.

Elizabeth Olsen

Well-washed and well-combed domestic pets grow dull; they miss the stimulus of fleas.

Francis Galton

I opened the large central window of my office room to its full on the fine early May morning. Then I stood for a few moments, breathing in the soft, warm air that was charged with the scent of white lilacs below.

Angus Wilson

Running for me has always been a great place to get away. It's a great stress reliever for me. It's great if I need to be working on something in my mind, whether it's things I need to be memorizing or thinking about, or I have some presentation coming up.

Scott Bakula

I have no intention of letting this decision change the way that I approach my training and preparation for games, but the time has come for me to realise that I have gone as far as I can go with this England team.

Jonny Wilkinson

The only thing I command is respect.

Kyrie Irving

From the fall of October, 1980 to March, 1984 I never lost a competition.

Scott Hamilton

A woman needs ropes and ropes of pearls.

Coco Chanel