[SOLVED] Error with simple Shader

[alberto_lara]

EDIT: this is love 11.4
EDIT 2: I just realized I'm using extern instead of uniform, that doesn't fix the issue (same problem)

Do you people see anything wrong with this? I'm building an app related to color palettes and I was able to isolate the issue:

Code: Select all

shader = love.graphics.newShader([[
  extern vec3 colors[3];

  vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) {
    vec4 pixel = Texel(texture, texture_coords);
    number average = (pixel.r + pixel.g + pixel.b) / 3.0;
    
    for (int i = 0; i < 46; i++) {
      vec3 color = colors[i];
    }

    return pixel;
  }
]])

function love.update(dt)
  shader:send('colors', {1, 0, 0}, {0, 1, 0}, {0, 0, 1})
end

function love.draw()
  love.graphics.setShader(shader)
  love.graphics.setColor(1, 1, 0)
  love.graphics.rectangle("fill", 0, 0, 800, 600)
  love.graphics.setShader()
end

EDIT 3: tried an even simpler version, same issue:

Code: Select all

shader = love.graphics.newShader([[
  uniform vec3 colors[3];

  vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) {
    vec4 pixel = Texel(texture, texture_coords);
    vec3 c = colors[0];
    return pixel;
  }
]])

function love.update(dt)
  shader:send('colors', {1, 0, 0}, {0, 1, 0}, {0, 0, 1})
end

[slime]

Your shader code needs to use the uniform in a manner that affects the final output of the shader, otherwise your graphics driver will optimize out the uniform when compiling the shader.

[alberto_lara]

holy cow, I missed that simple fact like 10 years ago lol, thanks! (it works now)