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) — vecn: the default vector of n floats. bvecn: a vector of n booleans. ivecn: a vector of n integers. uvecn: a vector of n unsigned integers. dvecn: a vector of n double 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

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

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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!

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Tony Nemo

It is only when a person gets into difficulty that one can truly see his heart.

Matthew Polly

All change is not growth as all movement is not forward.

Ellen Glasgow

I am in control of my life.

Unknown

Ever since I was a little girl, I've worried too much. It always bothers me because sometimes you end up worrying more about the worry and you are not resolving things that are right there in front of you. I have been like that all my life, and it's hard to change.

Penelope Cruz

I always sympathized with the people who did work for hire; I was one of them.

Stan Lee

When I quit all these things and said I didn't have any time, I meant I didn't have any time.

Sharon Olds

I won't let any ambassador have a say about my foreign travels.

Milos Zeman

There's an assault on human sexuality, as Judge Scalia said, they've taken sides in the culture war and on top of that if we have a democracy, the democratic processes should be that we can elect representatives who will share our point of view and vote those things into law.

Pat Robertson

I really want to fall in love.

Enrique Iglesias

The husband is always the last to know

Unknown

Therefore when the mind knows itself and loves itself, there remains a trinity, that is the mind, love and knowledge.

Peter Lombard

I really love all sport. I watch sports when I can, but when push comes to show, I think I know it's entertainment.

Alistair Petrie

The foregoing considerations lead us to the very important conclusion, that matter is essentially force, and nothing but force; that matter, as popularly understood, does not exist, and is, in fact, philosophically inconceivable.

Alfred Russel Wallace

Sadness is a super important thing not to be ashamed about but to include in our lives. One of the bigger problems with sadness or depression is there's so much shame around it. If you have it you're a failure. You are felt as being very unattractive.

Mike Mills

My life is a perfect graveyard of buried hopes.

L.M. Montgomery,

My life has been wonderful. Everybody has to be a little lucky, I think.

Christopher Walken

The guys I grew up with, my cinematic heroes, have always been men of few words, but of action. Clint Eastwood, Eli Wallach.

Adam Baldwin

Explosion of positive rights started in 1932 with the election of Roosevelt.

P. J. O'Rourke

I love to be creative and to put flesh onto the ideas that are inside of me. And there are not that many great programs that are coming out through Hollywood, and I'm tired of waiting around for someone to hand me a good script, so I'm going to go and produce something.

Kirk Cameron

I think being self-referential is really narcissistic. Who's to say anybody's even thinking of you that much? But some of these movies that I've done, people still recite lines to me, even 20 years later.

John Cusack

How deeply seated in the human heart is the liking for gardens and gardening.

Alexander Smith

Why do people say no offensex9D right before theyre about to offend you

Anonymous

What sunshine is to flowers, smiles are to humanity. These are but trifles, to be sure; but scattered along life's pathway, the good they do is inconceivable.

Joseph Addison

There is so much freedom I enjoy in theatre. In films, the roles are limited.

Lillete Dubey