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.

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

GLSL types

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)

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.

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

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

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.

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

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

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

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

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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People don't throw your bags out of windows because of lies; they throw them out because of the truth.

To spend your time wanting things is to smother your time for achieving things beyond your expectations.

The good life as I conceive it is a happy life. I do not mean that if you are good you will be happy I mean that if you are happy you will be good.

I think I could have become an outstanding professional baseball player, but I don't think I could have reached the heights that I have in football - being one of the very top players in the game, being a world champion.

I want to be the coolest aunt in the entire world.

Everyone should change; otherwise, you can't grow as a person in life.

I work hard, and I'm thankful people recognize that.

People don't stop at a size 12. I feel like there's a big thing missing where you can't dress to your mood above a certain number.

Big defeats make us learn.

The Internet is going to have a bigger impact on content creators than the television ever had. The reason why that's the case is that suddenly you're able to tell stories 24/7 in the home, out of the home, in every room of the home. A television screen can be in your pocket through a smartphone.

The man who passes the sentence should swing the sword.

In the past I have never thought about loneliness when working, and I don't think about it now. Yet there must be a reason for the fact that so many people talk about it.

Value denotes a relation reciprocally existing between two objects, and the precise relation which it denotes is the quantity of the one which can be obtained in exchange for a given quantity of the other.

My life is the land, the dogs, the car, the motorcycle, the pond, the canoe, going to pick up mail. It's just a rural retreat that I enjoy.

Choose to love with all your heart, even if it sometimes breaks.

I've learned to keep your mouth shut even when something bad is going on. You never know how someone is going to take something you say. You have to bite the bullet.

I wanted to get the most broad foundation for a lifelong education that I could find, and that was studying Latin and the classics. Meaning Roman and Greek history and philosophy and ancient civilizations.

Reinforced concrete buildings are by nature skeletal buildings. No noodles nor armoured turrets. A construction of girders that carry the weight, and walls that carry no weight. That is to say, buildings consisting of skin and bones.

We don't see the people who are doing real things getting enough props. We often see politicians who are everywhere but nowhere at the same goddamn time. You know the kind of person: You see them everywhere on television but nowhere in front of your face.

Decision is a risk rooted in the courage of being free.

My business life is really simple. It's like, get check. Put check in bank. Pay rent. I've never bought a stock in my life. I never got caught up in that trip. And the truth is, I don't obsess about money ever.

Since I've had a son, I want to be around to see him grow up.

The people I really do dislike are the morally unimaginative kind of evolutionary reductionists who, in the name of science, think they can explain everything in terms of our early hominid ancestors or our genes, with their combination of high-handed tone and disregard for history. Such reductive speculation encourages a really empty scientism.

Anything I do has to have integrity, so if you just want to make music, it's not difficult finding support. The hard part for a publicist or manager is making a star.