LÖVE

RNavega wrote: ↑Sun Jan 22, 2023 10:35 pm I think you can just use the "varying" qualifier to describe an interpolated out in the vertex shader, as seen in this macro here in the Löve source:
https://github.com/love2d/love/blob/mai ... r.lua#L202

Edit: hm, and using "varying" again for the in attribute in the fragment shader, as seen a few lines below with another macro:
https://github.com/love2d/love/blob/mai ... r.lua#L248

Bigfoot71 wrote: ↑Sun Jan 22, 2023 10:11 pm Something that looks like this? (I slightly customized it to my taste). Say if it's good what you want to talk about when you say "interpolated triangles" and by the way why do you want to do it on Löve2d and not directly with OpenGL which seems more appropriate to me? (in the sense that you'll learn more by wanting to do it directly on OpenGL but that's just my opinion)

Code: Select all

local lg = love.graphics

-- Create the triangle vertices
local vertices = {
    {-0.5, -0.5, 1, 0, 0},
    {0.5, -0.5, 0, 1, 0},
    {0, 0.5, 0, 0, 1}
}

-- Create a new mesh to hold the triangle
local triangle = lg.newMesh(vertices, "triangles")

-- Create the color interpolation shader
local shader = lg.newShader[[
    extern number time;
    vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) {
        return vec4(texture_coords, sin(time), 1.0);
    }
]]

function love.draw()
    shader:send("time", love.timer.getTime())
    lg.setShader(shader)
    lg.draw(triangle,lg.getWidth()/2,lg.getHeight()/2,0,100,100)
    lg.setShader()
end

In any case this page could help you: https://love2d.org/wiki/Shader_Variables
And to pass values ​​from a vertex shader to the fragment shader you can use `varying`.

Edit:

By reading your post a bit and doing some research I think I understood what you want, here is what I did, from what I understood from your post you must have the basics to understand how the code works but if you have any doubts do not hesitate to ask me:

Code: Select all

local lg = love.graphics

-- Create attributes of the triangle

local attributes = {
    {"VertexPosition", "float", 2},
    {"VertexColor", "byte", 4},
}

-- Create the triangle vertices

local vertices = {
    {-0.5, -0.5, 1, 0, 0},
    {0.5, -0.5, 0, 1, 0},
    {0, 0.5, 0, 0, 1}
}

-- Create a new mesh to hold the triangle

local triangle = lg.newMesh(attributes, vertices, "triangles", "static")

-- Set up the color interpolation shader
local shader = lg.newShader([[

    varying vec4 vColor;

    vec4 position( mat4 transform_projection, vec4 vertex_position ) {
        vColor = VertexColor;
        return transform_projection * vertex_position;
    }

]], [[

    varying vec4 vColor;

    vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) {
        return vColor;
    }

]])

function love.draw()

    lg.setShader(shader)
    lg.draw(triangle,lg.getWidth()/2,lg.getHeight()/2,0,200,200)
    lg.setShader()

end

I had never done it before but with these pages from the Löve2D documentation: love.graphics.newMesh and Shader Variables.

And also this page which made me understand what you wanted I managed to realize it, so I hope that with all this you will also understand and that you can redo it to your sauce

shader = love.graphics.newShader(FragmentCode, VertexCode)