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

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shaders

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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

My songs have always been frustrating themes, relationships that I've had. And now that I'm in love, I expect it to be really happy, or at least there won't be half as much anger as there was.

Kurt Cobain

Girls are more attractive to me than dresses.

David Bailey

It is an equal failing to trust everybody, and to trust nobody.

English Proverb

Filming in India was one big adventure. For 'The Cheetah Girls', we were in Mumbai for two weeks, then Rajasthan for six weeks. Every day after shooting, I would hop into a rickshaw and start exploring the city. I even learned a bit of Hindi. It's such an amazing place to visit.

Michael Steger

Our citizens deserve the best and theyre not getting the best right now. There are some things that are suffering because you just cant give it your entire effort. This is not really the way we want to do this.

Sonia Brock

We need to stop the erosion of parental authority.

Sonny Landham

I truly appreciate the special qualities that America and American national myths offer me.

Bharati Mukherjee

Goal setting is similar to travelling from point A to point B within a city. If you clearly understand what the goal is you will definitely reach the destination because you know its address.

Thomas Abreu

Adolescence: A stage between infancy and adultery.

Ambrose Bierce

She was ready to deny the existence of space and time rather than admit that love might not be eternal.

Simone De Beauvoir

Whoever loveth me, loveth my hound.

Thomas More

There will one day spring from the brain of science a machine or force so fearful in its potentialities, so absolutely terrifying, that even man, the fighter, who will dare torture and death in order to inflict torture and death, will be appalled, and so abandon war forever.

Thomas A. Edison

We shall see our friends again. We can lay them in the grave; we know they are safe with God.

Matthew Simpson

It's very hard to imagine the phrase 'consumer society' used so cheerfully, and interpreted so enthusiastically, in England.

Julie Burchill

To look and feel my best, I watch my calories and exercise.

Kim Kardashian

Every lawsuit results from somebody doing something wrong. If everybody did right, we wouldn't need laws.

Alan Dershowitz

The threshold of the Dream Act is not high enough. One year of community college is not enough... No, I do not support the Dream Act.

Michael Baumgartner

Nothing is so dangerous for our security as large groups of desperate people.

Marianne Williamson

The Earth reminded us of a Christmas tree ornament hanging in the blackness of space. As we got farther and farther away it diminished in size. Finally it shrank to the size of a marble, the most beautiful marble you can imagine.

James Irwin

Don't kid yourself that you're going to live again after you're dead; you're not. Make the most of the one life you've got. Live it to the full.

Richard Dawkins

Innovation means change.

Sebastian Thrun

My first offer was when I was 12, and it was for a soap opera. And I turned it down because I knew that I was an unformed actor, and I didn't want to develop bad habits.

Claire Danes

THE MISCONCEPTION: You are a rational, logical being who sees the world as it really is. THE TRUTH: You are as deluded as the rest of us, but that's OK, it keeps you sane.

David McRaney

You use and lose a lot of energy being grumpy.

Ted Danson