your shader

F

fornite•4/3/23, 10:19 AM

or is it like a default color

L

Lyris the KitoriOP•4/3/23, 10:20 AM

look at your fragment shader

LLyris the Kitori your shader

F

fornite•4/3/23, 10:20 AM

where do i specify the color orange though

L

Lyris the KitoriOP•4/3/23, 10:20 AM

explain what it does to me

F

fornite•4/3/23, 10:20 AM

ok one sec

L

Lyris the KitoriOP•4/3/23, 10:20 AM

read through the shader code line by line, and write comments explaining it

L

Lyris the KitoriOP•4/3/23, 10:20 AM

if you dont know something at all, just put a question mark

A

Aqua•4/3/23, 10:20 AM

the tutorial on the website goes over exactly what the fragment shader does

F

fornite•4/3/23, 10:22 AM

            const string fragmentCode = @"
                // the version of glsl
                #version 330 core 
                
                // i think out means to output something and out_color is the name of a variable?
                out vec4 out_color; 

                // main function
                void main()
                {
                    // is vec4 an RGBA value with the color?
                    out_color = vec4(1.0, 0.5, 0.2, 1.0);
                }
            ";

            const string fragmentCode = @"
                // the version of glsl
                #version 330 core 
                
                // i think out means to output something and out_color is the name of a variable?
                out vec4 out_color; 

                // main function
                void main()
                {
                    // is vec4 an RGBA value with the color?
                    out_color = vec4(1.0, 0.5, 0.2, 1.0);
                }
            ";

            const string fragmentCode = @"
                // the version of glsl
                #version 330 core 
                
                // i think out means to output something and out_color is the name of a variable?
                out vec4 out_color; 

                // main function
                void main()
                {
                    // is vec4 an RGBA value with the color?
                    out_color = vec4(1.0, 0.5, 0.2, 1.0);
                }
            ";

            const string fragmentCode = @"
                // the version of glsl
                #version 330 core 
                
                // i think out means to output something and out_color is the name of a variable?
                out vec4 out_color; 

                // main function
                void main()
                {
                    // is vec4 an RGBA value with the color?
                    out_color = vec4(1.0, 0.5, 0.2, 1.0);
                }
            ";

A

Aqua•4/3/23, 10:23 AM

yes the vec4 contains the output color

A

Aqua•4/3/23, 10:23 AM

in this case an orange

A

Aqua•4/3/23, 10:23 AM

it's in RGBA format

L

Lyris the KitoriOP•4/3/23, 10:23 AM

4 floats

AAqua the tutorial on the website goes over exactly what the fragment shader does

F

fornite•4/3/23, 10:23 AM

if the fragment shader changes the colors of the pixels inside the shape

F

fornite•4/3/23, 10:23 AM

what is the point of the vertex shader

F

fornite•4/3/23, 10:23 AM

on the tutorial

F

fornite•4/3/23, 10:23 AM

it said like rotations or something

F

fornite•4/3/23, 10:23 AM

but what does that mean

A

Aqua•4/3/23, 10:23 AM

the vertex shader tells the GPU where to place the vertices

A

Aqua•4/3/23, 10:24 AM

so you can apply transformations to the vertices to place them in different points

A

Aqua•4/3/23, 10:24 AM

in the tutorial we're just giving a very basic example so the vertex shader does very little

A

Aqua•4/3/23, 10:24 AM

but in actuality the vertex shader is extremely important

A

Aqua•4/3/23, 10:25 AM

just as important as the fragment shader

F

fornite•4/3/23, 10:25 AM

            const string vertexCode = @"
                #version 330 core

                // wtf
                layout (location = 0) in vec3 aPosition;

                void main()
                {
                    // create a variable called gl position and set it to full opacity and the first 3 values to whatever the fuck aposition is?
                    gl_Position = vec4(aPosition, 1.0);
                }
            ";

            const string vertexCode = @"
                #version 330 core

                // wtf
                layout (location = 0) in vec3 aPosition;

                void main()
                {
                    // create a variable called gl position and set it to full opacity and the first 3 values to whatever the fuck aposition is?
                    gl_Position = vec4(aPosition, 1.0);
                }
            ";

            const string vertexCode = @"
                #version 330 core

                // wtf
                layout (location = 0) in vec3 aPosition;

                void main()
                {
                    // create a variable called gl position and set it to full opacity and the first 3 values to whatever the fuck aposition is?
                    gl_Position = vec4(aPosition, 1.0);
                }
            ";

            const string vertexCode = @"
                #version 330 core

                // wtf
                layout (location = 0) in vec3 aPosition;

                void main()
                {
                    // create a variable called gl position and set it to full opacity and the first 3 values to whatever the fuck aposition is?
                    gl_Position = vec4(aPosition, 1.0);
                }
            ";

A

Aqua•4/3/23, 10:26 AM

again the tutorial goes over literally everything in that shader

F

fornite•4/3/23, 10:26 AM

let me look

F

fornite•4/3/23, 10:28 AM

so is aposition a value created by me or like an argument passed in by the driver

A

Aqua•4/3/23, 10:29 AM

notice where you set up glVertexAttribArray? this sets up what data aPosition gets sent to

A

Aqua•4/3/23, 10:29 AM

take a look at what it does

F

fornite•4/3/23, 10:30 AM

positionLoc

A

Aqua•4/3/23, 10:30 AM

again, this is described in the tutorial

F

fornite•4/3/23, 10:30 AM

shader attributes

F

fornite•4/3/23, 10:31 AM

okay so

F

fornite•4/3/23, 10:31 AM

back to buffersubdata

F

fornite•4/3/23, 10:31 AM

ill look at that

F

fornite•4/3/23, 10:31 AM

how do i know what the target is

A

Aqua•4/3/23, 10:31 AM

https://dotnet.github.io/Silk.NET/docs/opengl/c1/2-hello-quad.html#setting-up-the-attributes

Silk.NET - High-Speed & Advanced .NET Graphics & Compute

1.2 - Hello Quad

F

fornite•4/3/23, 10:34 AM

what happens if i change positionLoc to 1

F

fornite•4/3/23, 10:35 AM

the shapes despawned

F

fornite•4/3/23, 12:17 PM

can i change the color of my shape without directly changing the shader

F

fornite•4/3/23, 12:18 PM

cus like if i want a

DrawRect

DrawRect

DrawRect

DrawRect function i wanna be able to input the color but does that mean that i have to create and compile a new shader with a different color every single time i run the function

F

fornite•4/3/23, 12:18 PM

which can be multiple times per frame

A

Aqua•4/3/23, 12:18 PM

https://learnopengl.com/Getting-started/Shaders

F

fornite•4/3/23, 12:21 PM

ah okay i get how variables can be like imported or exported from a shader

F

fornite•4/3/23, 12:21 PM

but

out_color

out_color

out_color

out_color is never like used outside of the shader

F

fornite•4/3/23, 12:21 PM

does opengl automatically look for a variable called

out_color

out_color

out_color

out_color?

A

Aqua•4/3/23, 12:23 PM

the outputs of the fragment shader determine the output color of each draw buffer. you can have multiple

out

out

s in a fragment shader for different draw buffers.
you don't need to worry about that right now, just know that opengl knows what the value of out_color is and will use that to determine the color of each pixel

F

fornite•4/3/23, 12:24 PM

so lets say i wanted to externally input a color into the shader and then output that to opengl or whatever

F

fornite•4/3/23, 12:24 PM

would it look like this:

A

Aqua•4/3/23, 12:24 PM

the name doesn't matter either, as long as its an

out

out

you could name it

out myStupidVariable

out myStupidVariable

out myStupidVariable

out myStupidVariable and it would still work

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