offset in bytes into the buffer

AAqua offset in bytes into the buffer

F

fornite•4/3/23, 10:17 AM

why would i need to do that

L

Lyris the Kitori•4/3/23, 10:17 AM

to upload a single part of a larger buffer

F

fornite•4/3/23, 10:17 AM

wait

A

AquaOP•4/3/23, 10:18 AM

so you can update subsections of the buffer with data
aka
BufferSubData lol

LLyris the Kitori to upload a single part of a larger buffer

L

Lyris the Kitori•4/3/23, 10:18 AM

such as a single shape, in a buffer with many of them

F

fornite•4/3/23, 10:18 AM

if i make like functions to draw texturres

F

fornite•4/3/23, 10:18 AM

do i need to put it into these buffers too

L

Lyris the Kitori•4/3/23, 10:18 AM

lets ignore texturing until you get the basics down lol

L

Lyris the Kitori•4/3/23, 10:18 AM

thats a whole 'nother mess

F

fornite•4/3/23, 10:18 AM

jesus

L

Lyris the Kitori•4/3/23, 10:19 AM

texturing will just "make sense" once you get the concepts of buffers and vertex layouts and shaders down

L

Lyris the Kitori•4/3/23, 10:19 AM

but for now, we shall ignore textures for our sanity, and yours

F

fornite•4/3/23, 10:19 AM

HAHAHA

F

fornite•4/3/23, 10:19 AM

hold on

F

fornite•4/3/23, 10:19 AM

what makes my rectangles orange

F

fornite•4/3/23, 10:19 AM

is it the shader

L

Lyris the Kitori•4/3/23, 10:19 AM

your shader

F

fornite•4/3/23, 10:19 AM

or is it like a default color

L

Lyris the Kitori•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 Kitori•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 Kitori•4/3/23, 10:20 AM

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

L

Lyris the Kitori•4/3/23, 10:20 AM

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

A

AquaOP•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

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

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fornite•4/3/23, 10:31 AM

okay so

offset in bytes into the buffer

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