Shader tile

[Manyrio]

Hey !
I am learning Love2d GLSL shader, and if I am here it's because I have a problem :/
I want to do shadow on my tiles like this :

but when I test with shader it do that :

I send variable to my shader.
I tested to colored the textures but it's not what I want ... :

[Nixola]

We'll need to see the shader as well as the code; can you make a .love file that shows the issue? Help us help you

[Manyrio]

Here's the code :

Code: Select all

function shadwo_update()
for x = begx, endx do --math.floor((player.x)/32)+player.focus
    for y = begy, endy do
	if (x > begx and y > begy) and (x < endx and y < endy) then
		if map[x][y]  == 1 then
			dark.r[x][y] = 255
			dark.g[x][y] = 255
			dark.b[x][y] = 255
			dark.a[x][y] = 255
		end
		if map[x][y]  ~= 1 then
			dark.r[x][y] = (dark.r[x][y-1]+dark.r[x][y+1]+dark.r[x-1][y]+dark.r[x+1][y])/4.12
			dark.g[x][y] = (dark.g[x][y-1]+dark.g[x][y+1]+dark.g[x-1][y]+dark.g[x+1][y])/4.12
			dark.b[x][y] = (dark.b[x][y-1]+dark.b[x][y+1]+dark.b[x-1][y]+dark.b[x+1][y])/4.12
			dark.a[x][y] = (dark.a[x][y-1]+dark.a[x][y+1]+dark.a[x-1][y]+dark.a[x+1][y])/4.12
		end
		shader.shadow:send("maskr",dark.r[x][y])
     		shader.shadow:send("maskg",dark.g[x][y])
      		shader.shadow:send("maskb",dark.b[x][y])
	end
end
end
shader.shadow = love.graphics.newShader([[
  extern number maskr = 0;
  extern number maskg = 0;
  extern number maskb = 0;
  vec4 effect( vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords ){
    vec4 pixel = Texel(texture, vec2(screen_coords.x, screen_coords.y));
    pixel.r = pixel.r-maskr/255;
    pixel.g = pixel.g-maskg/255;
    pixel.b = pixel.b-maskb/255;
    return pixel;
  }
]])

[Evine]

Fixed it I think. In the shader you used the "screen_coords" while you should use "texture_coords".

Code: Select all

function shadwo_update()
for x = begx, endx do --math.floor((player.x)/32)+player.focus
    for y = begy, endy do
	if (x > begx and y > begy) and (x < endx and y < endy) then
		if map[x][y]  == 1 then
			dark.r[x][y] = 255
			dark.g[x][y] = 255
			dark.b[x][y] = 255
			dark.a[x][y] = 255
		end
		if map[x][y]  ~= 1 then
			dark.r[x][y] = (dark.r[x][y-1]+dark.r[x][y+1]+dark.r[x-1][y]+dark.r[x+1][y])/4.12
			dark.g[x][y] = (dark.g[x][y-1]+dark.g[x][y+1]+dark.g[x-1][y]+dark.g[x+1][y])/4.12
			dark.b[x][y] = (dark.b[x][y-1]+dark.b[x][y+1]+dark.b[x-1][y]+dark.b[x+1][y])/4.12
			dark.a[x][y] = (dark.a[x][y-1]+dark.a[x][y+1]+dark.a[x-1][y]+dark.a[x+1][y])/4.12
		end
		shader.shadow:send("maskr",dark.r[x][y])
     		shader.shadow:send("maskg",dark.g[x][y])
      		shader.shadow:send("maskb",dark.b[x][y])
	end
end
end
shader.shadow = love.graphics.newShader([[
  extern number maskr = 0;
  extern number maskg = 0;
  extern number maskb = 0;
  vec4 effect( vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords ){
    vec4 pixel = Texel(texture, vec2(texture_coords.x, texture_coords.y));        // texture_coords here
    pixel.r = pixel.r-maskr/255;
    pixel.g = pixel.g-maskg/255;
    pixel.b = pixel.b-maskb/255;
    return pixel;
  }
]])

[Manyrio]

Hey ! Thanks, that's better but it still doesn't work
it do someting like that :

if i jump a little bit :

If i rejump a little bit :