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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For me, a stay at the Uma Paro with Pilates every morning is a perfect escape.

I joined another circle and the leader gave us a little leaflet in very small print, asking us to read it carefully and then come prepared to ask questions. It was a technical Marxist subject and I did not understand it nor did I know what questions to ask.

Grace is given of god, but knowledge is bought in the market.

Indeed, the whole point of the man bun, I have surmised, is to assert a high proficiency at yoga. There are no yoga-achievement badges, no coloured belts like judo, so the male yoga expert needs some other kind of visible symbol.

The whole problem of the sound-work is distancing oneself from the dramatic.

If everyone is thinking alike then somebody isn t thinking.

Putin probably, almost certainly, thinks that one of the great disasters of the 20th century was the demise of the Soviet Union. It's very obvious that he's trying to work its way back and maintain something similar to that sort of institution.

You can go as far as you dream think and imagine.

It ain’t over till it’s over.

One of the men attached to the prison was the occasion of great amusement on the part of the prisoners, as well as the spectators, by taking a large lump of ice to show these strangers from the tropics.

Yet, so far from laboring to know the forbidden tree of worldly pleasures and its various fruits, man gives himself up to a careless and thoughtless state of life, and yields to the lust of the flesh, not considering that this lust is really the forbidden tree.

The test of the morality of a society is what it does for its children.

I'll have to have a room of my own. Nobody could sleep with Dick. He wakes up during the night, switches on the lights, speaks into his tape recorder.

I think the ability to hit - some guys have it and some guys don't - but I think how dedicated you are to trying to get the most out of yourself, I think kind of determines how good you are and for how long. I was born with the ability to hit, but my work ethic has taken it to the next level.

Schultz is not a Nazi. I see Schultz as the representative of some kind of goodness in any generation.

You want to stake your own claim. You don't want to be called a copycat.

Between New York and LA, there's 200 million people that aren't hip, and they don't want to be hip.

The only thing I believe is this: A player does not have to like a manager and he does not have to respect a manager. All he has to do is obey the rules.

A mutual arrangement, I repeat, is the only satisfactory medium whereby the present system can be carried on with any degree of satisfaction, and in such an arrangement the employers have more to gain than the workers.

Solitary decisions, no matter how well-founded they may appear to individuals, must belong to the past along with national, unilateralist action.

I've always loved men.

I think sometimes when you begin to examine things - like yourself - suddenly you can just freak out and not want to go any further.

I never have taken a picture I've intended. They're always better or worse.

I have something called endometriosis, and I was told by my gynecologist that I needed to go on a specific diet if I didn't want to have any more surgery.