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 — (this is done when linking a program object).

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

Email:thur antony@gmail com128723 1pk4hyr.fwlc6av2t9

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

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

Email:thur antony@gmail com128723 1efbv6w.aoh97ctyb9

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

Tony Nemo

Email:thur antony@gmail com128723 ld2zcw.nfdme1m7vi

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

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

Tony Nemo

Email:thur antony@gmail com128723 1ozbhf5.02a1qbyb9

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

Those whom God wishes to destroy, he first makes mad.

Euripides

I've exceeded a few of my goals, but I'm behind on a couple of others.

Tiger Woods

Apparently when its two people its quirky and funny but when its a person doing the same stuff on her own its rebellious and antisocial.

Katie Alender

You must not only aim right, but draw your bow with all your might.

Henry David Thoreau

I was thinking 'Love Story', obviously, was a romantic film of that time.

Felicity Jones

To have children on the set, you realize that if a 10-year-old can do it, who are you kidding? It humbles you.

Bonnie Hunt

Why is it that the king can do no wrong? This shows they do not regard the king as being a human. But the king can do wrong.

Bhumibol Adulyadej

Everybody with a gun has a checkpoint in Lebanon. And in Lebanon, you'd be crazy not to have a gun. Though, I assure you, all the crazy people have guns, too.

P. J. O'Rourke

When I was in college, I was debating to try my hand at show business, or to become a professor. I just thought of the risk of not going into show business and always wondering if I would've had a chance. Because that's where my real heart was.

Steve Martin

I wouldn't say I was the best manager in the business. But I was in the top one.

Brian Clough

I think it's really great when you stand up for something that you really believe, even if you get heat for it.

Christina Aguilera

I want to show that I'm a real teenager, not some fantasized Hollywood kid.

Mark Indelicato

Select a subject that interests you and make an effort to become an expert in that field. I promise you, if you make the effort, and you become an expert, you will have a wonderful career.

Dan Shechtman

Some women work while they are pregnant, but not me. That was a choice I had made. That's when I took a break. Men can work at whatever stage they are; whether they turn daddy, they still have their own thing. But women can't afford that because by being mothers, they have to be there for their kids.

Madhuri Dixit

I was bused to a school in Gerritsen Beach in Brooklyn in 1972. I was one of the first black kids in the history of the school.

Chris Rock

I like test screenings. I like to see a movie with an audience of strangers. I think it tells you a lot.

Andrew Dominik

The director's who want to be innovative use the DVD as a tool to see what people have done in the past and you have other people who will actually take from better directors and that makes them better directors.

Jerry Bruckheimer

The Windows 95 launch was such an incredible experience.

Suzan DelBene

I like all Jim Carrey films. They're really funny.

Rupert Grint

I really learned the power of the tube on Sesame Street and how it can influence a very young mind.

Ruth Buzzi

I prefer writing in the mornings, so to that extent I have a routine. I do reading and other things in the afternoon.

James Fenton

I think what has happened, actually, is that September 11 has given a spur, a renewed urgency, to dialogue between the great faiths.

George Carey

If you are looking for a needle in a haystack, and somebody has already cataloged all the straw in the haystack, when you get to that needle you will recognize it's different than what was supposed to be there based on all that computerized haystack information that had been predetermined for you.

Francis Collins

I am, more than anything else, happy.

Mary, Crown Princess of Denmark