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

AquaOP•4/3/23, 10:23 AM

yes the vec4 contains the output color

A

AquaOP•4/3/23, 10:23 AM

in this case an orange

A

AquaOP•4/3/23, 10:23 AM

it's in RGBA format

L

Lyris the Kitori•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

AquaOP•4/3/23, 10:23 AM

the vertex shader tells the GPU where to place the vertices

A

AquaOP•4/3/23, 10:24 AM

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

A

AquaOP•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

AquaOP•4/3/23, 10:24 AM

but in actuality the vertex shader is extremely important

A

AquaOP•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

AquaOP•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

AquaOP•4/3/23, 10:29 AM

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

A

AquaOP•4/3/23, 10:29 AM

take a look at what it does

F

fornite•4/3/23, 10:30 AM

positionLoc

A

AquaOP•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

AquaOP•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

AquaOP•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

AquaOP•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

out

outs 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

AquaOP•4/3/23, 12:24 PM

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

out

out

out

out
you could name it

out myStupidVariable

out myStupidVariable

out myStupidVariable

out myStupidVariable and it would still work

F

fornite•4/3/23, 12:24 PM

in vec3 myInputtedColor

out vec3 myOutputtedColor

void main() {
  myOutputtedColor = myInputtedColor
}

in vec3 myInputtedColor

out vec3 myOutputtedColor

void main() {
  myOutputtedColor = myInputtedColor
}

in vec3 myInputtedColor

out vec3 myOutputtedColor

void main() {
  myOutputtedColor = myInputtedColor
}

in vec3 myInputtedColor

out vec3 myOutputtedColor

void main() {
  myOutputtedColor = myInputtedColor
}

AAqua the name doesn't matter either, as long as its an `out` you could name it `out m...

F

fornite•4/3/23, 12:25 PM

ohh

F

fornite•4/3/23, 12:25 PM

but how does it know that variable is for the color and not something else

Ffornite ```glsl in vec3 myInputtedColor out vec3 myOutputtedColor void main() { myO...

F

fornite•4/3/23, 12:25 PM

would this be how i would need to externally control a color in the shader?

Ffornite ```glsl in vec3 myInputtedColor out vec3 myOutputtedColor void main() { myO...

A

AquaOP•4/3/23, 12:25 PM

yep, the

in

in

value in this case would come from the vertex shader
so you'd define vertex colors in your vertex buffer, set up the attribs, and then set this value in the vertex shader

A

AquaOP•4/3/23, 12:26 PM

based on what you're trying to do though it could be done with a

uniform

uniform

uniform

uniform
but vertex colors is what i'd advise doing

Ffornite but how does it know that variable is for the color and not something else

A

AquaOP•4/3/23, 12:26 PM

out

out

out

out variables in fragment shaders are always for color

AAqua based on what you're trying to do though it could be done with a `uniform` but v...

F

fornite•4/3/23, 12:26 PM

oh yeah im reading about those right now

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

Similar Threads