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

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

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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With 'Bangarang,' I didn't make any announcement, no campaign. I just put it on my Facebook and some other places. That's how I've done everything with my previous records. I've always kept it organic.

I don't believe in very many things, but art is definitely one of them. And at the top of that list, film and art influence our world's culture much more than many of us understand and fully respect.

A world community can exist only with world communication, which means something more than extensive short-wave facilities scattered; about the globe. It means common understanding, a common tradition, common ideas, and common ideals.

I always thought it was a goat that kicked me over the fence. My mama told me the other day it was a cow. Now I'm sort of scared of both.

I make movies based on gut.

It's funny because it's funny.

When you're used to being in the public eye, if you've got a disease, you've got to own up to it. It's about being about it, not running from it.

Probably the sexiest woman I know is my mother.

When we are in love, we are convinced nobody else will do. But as time goes, others do do, and often do do, much much better.

I love both sports, but the deciding factor was, being a left-handed pitcher, I had a huge advantage in baseball because of that, and I didn't have that type of advantage in hockey.

Indonesian writers are so far behind in terms of global exposure compared with the Philippines and Japanese writers.

As we realize that more and more things have global impact, I think we're going to get people increasingly wanting to get away from a purely national interest.

The fewer the words the better the prayer.

In Canada, we have so much land, so much space, and so few people.

I think people hear the warmth in my voice and the friendliness, and they think: 'Oh, she must be a very nice person'.

Before you quit, you have to try.

I wouldn't consider retiring to India: there are too many people, and it's difficult walking along the pavements. I'd love to spend two or three months a year there.

I was there at the birth of my son and had the extraordinary feeling when I first saw him of thinking this was the first person I would willingly die for. I had the same strong feelings when my daughter was born.

Oh I love gadgets and I pride myself on keeping at the cutting edge of technology.

Actors do have good and bad sides. It's because the passage down the birth canal distorts the face. People born by caesarean section are more symmetrical.

If you're going to go increase taxes on small businesses, you're going to slow down the extent to which we're able to reduce unemployment. So I think it's a serious mistake; the wrong time to raise taxes.

Rumors generally grow deformed as they travel.

Eye of newt and toe of frog Wool of bat and tongue of dog Adders fork and blind worms sting Lizards leg and owlets wing For a charm of powerful trouble Like a hell broth boil and bubble.

People are so worried about what they eat between Christmas and New Year but they really should be worried about what they eat between the New Year and Christmas.