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!

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Tony Nemo

I like to make money; I like to have nice things. But I love to act; I love to tell stories.

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Sometimes I think I am still that 5-year-old girl playing with her dogs in the yard. That's how I see myself.

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My knees are ticklish.

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I'm surprised at the extent of the bigotry. But it really plays out when companies or schools take a side and prohibit the other platform at all. We Mac users should be good even when the other side is bad. We should do what we can to accept the other platforms.

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The painter knew the mirror lied. And the canvas told the truth.

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The circumstances of others seem good to us while ours seem good to others.

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Among the many misdeeds of the British rule in India, history will look upon the act depriving a whole nation of arms as the blackest.

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And, after all, what is a lie? 'Tis but the truth in a masquerade.

Alexander Pope

It's not subtle or restrained. It's not any of the things you like to think apply to your acting.

Margaret Hamilton

It's man's impact on our world that appeals to me more than just nature running wild.

Tim Gunn

When the French nation gradually came into existence among the ruins of the Roman civilization in Gaul, a new language was at the same time slowly evolved.

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To torture a man you have to know his pleasures.

Stanislaw Lem

London had so much death in its history, it was hard to find a spot without spirits. They formed a safety net. Still, you had to hope the ones you got were good.

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The test of one's behavior pattern is their relationship to society, relationship to work and relationship to sex.

Alfred Adler

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In design Mother Nature is our best teacher.

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There is no music unless the drum and the drummer are one.

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The whole world knows Dickens, his London and his characters.

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There will come a day when the phone doesn't ring as much as it used to.

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Every time I have visited the U.S., I have been asked to let loose my hair and remove the hair pins. Each time, I have put up a defiant face.

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A lot of people don't get second chances.

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