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

Tony Nemo

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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!

attention

Tony Nemo

Health is really important to me and my family. It's something that we value and that I strive for on a daily basis. MedImmune, the makers of Flumist Quadrivalent, knew about that and knew how important health is for me, so it was a no brainer for me to collaborate with them.

Tia Mowry

I do not literally paint that table, but the emotion it produces upon me.

Henri Matisse

I started Little Athletics when I was five years old, but my Olympics dream started when I was 10 years old.

Eloise Wellings

Certain springs are tapped only when we are alone. Women need solitude in order to find again the true essence of themselves; that firm strand which will be the indispensable center of a whole web of human relationships.

Anne Morrow Lindbergh

You don't have to be popular with the players to be a good manager or coach.

Francis Lee

People profess to have certain political positions, but their conservatism or liberalism is really the least interesting thing about them.

Zadie Smith

The Olympics remain the most compelling search for excellence that exists in sport, and maybe in life itself.

Dawn Fraser

I don't story board. I do something else, which is, I block it. We then train to the blocking. In other words, when everybody's training, they're actually training a lot of the moves that we are definitely going to use, and then, I do a lot of photography of that, and that becomes where the cameras go.

Michael Mann

Everyone has an idea, but it’s really about executing the idea and attracting other people to help you with the idea.

Jack Dorsey

My reputation was a bit exaggerated. Things were written in newspapers, then copied, then doubled. One of the reasons why I never disclaimed that, was because I found it amusing. But I also constructed such an image for myself in order to gain more of a private life.

Thomas Kretschmann

Whatever you cannot understand, you cannot possess.

Johann Wolfgang von Goethe

I grew up listening to AM radio in the '70s and hearing all of that great soul and rhythm and blues music, which definitely influenced the way I sing. But singing gospel has made me a much more humble person. There are so many people who were geniuses who only a few people knew about when they were alive.

Patty Griffin

A lurking pun is the worst pun, one the offender has been waiting to spring on you.

Terri Guillemets

You must make the product interesting, not just make the ad different. And that's what too many of the copywriters in the U.S. today don't yet understand.

Rosser Reeves

I mean, any time an actress gets to work with another actress, it's like, 'Oh, there are two of us in a movie! How are you? Let's sit in the hair chair together!' We're lonely women.

Jennifer Garner

You give a press conference, and they'll pick one word, they'll pick two words. The media is still out to write what they want to write.

Matt Harvey

I always think in life passion supersedes everything.

Bret Michaels

Profit or perish... There are only two ways to make money: increase sales and decrease costs.

Fred DeLuca

'Blue Plate Special' is the autobiography of my first half-century of life, with food as the subject.

Kate Christensen

Vaccines and antibiotics have made many infectious diseases a thing of the past; we've come to expect that public health and modern science can conquer all microbes. But nature is a formidable adversary.

Tom Frieden

The first stories I wrote when I was 12 were about Mars and landing on Mars.

Ray Bradbury

I'm not the 'look at me' kind of a person. I do not like showing off in public or written about.

Imtiaz Ali

I see people who talk about America, and then undermine it by not paying attention to its soul, to its poetry. I see polarization, reductionism and superficiality.

Azar Nafisi

I am very highly appreciated in my country, and everybody seems to love me.

Nadia Comaneci