I'm having problems with my blue color and y coordinate getting inverted when I send a canvas to a shader. You can see the effect here:
- x0nvLgc.jpg (94.19 KiB) Viewed 231 times
Code: Select all
local gr, mg, ky, tm, ev = love.graphics, love.image, love.keyboard, love.timer, love.event
love.graphics.setMode(800,600)
function love.load()
canvas = love.graphics.newCanvas(300, 225)
gr.setCaption( "Pixel Effect Lighting" )
image = gr.newImage( 'MyTest1.jpg' )
dif = gr.newImage( 'diffuse.png' )
nor = gr.newImage( 'normal.png' )
load_effect()
loc, dia = { 0.5, 0.5 }, 1.0
effect:send( 'dia', dia )
effect:send( 'pos', loc )
effect:send( 'u_texture', dif )
effect:send( 'u_normals', nor )
end
function love.draw()
love.graphics.setCanvas(canvas)
canvas:clear()
gr.draw( dif )
love.graphics.setCanvas()
effect:send( 'u_texture', canvas )
gr.setColor( 255, 255, 255, 255 )
gr.setPixelEffect( effect )
gr.draw( canvas )
gr.setPixelEffect( )
gr.setColor( 255, 255, 0, 255 )
gr.print( 'fps: '..tm.getFPS( ), 10, 520 )
gr.print( 'spot diameter: '..dia, 10, 540 )
gr.print( 'move spotlight with arrow keys', 10, 560 )
gr.print( 'change spot diameter with <s> & <d> keys', 10, 580 )
end
function love.update(dt)
if ky.isDown( 'up' ) then loc[2] = loc[2]<1 and loc[2]+dt or 1.0 effect:send( 'pos', loc ) end
if ky.isDown( 'down' ) then loc[2] = loc[2]>0 and loc[2]-dt or 0.0 effect:send( 'pos', loc ) end
if ky.isDown('right') then loc[1] = loc[1]<1 and loc[1]+dt or 1.0 effect:send( 'pos', loc ) end
if ky.isDown('left') then loc[1] = loc[1]>0 and loc[1]-dt or 0.0 effect:send( 'pos', loc ) end
if ky.isDown('d') then dia = dia < 3.0 and dia + dt or 3,0 effect:send( 'dia', dia ) end
if ky.isDown('s') then dia = dia > 0.1 and dia - dt or 0.1 effect:send( 'dia', dia ) end
end
function love.keypressed( key )
if key == 'escape' then ev.push( 'quit' ) end
end
function load_effect()
effect = love.graphics.newPixelEffect
[[
//our texture samplers
extern Image u_texture; //diffuse map
extern Image u_normals; //normal map
extern float dia;
extern vec2 pos;
vec4 effect(vec4 color, Image texture, vec2 tc, vec2 pixel_coords)
{
vec2 Resolution = vec2(800.0,600.0);
vec3 LightPos = vec3(pos,.1);
vec4 LightColor = vec4(1.0, 0.8, 0.6, 1);
vec4 AmbientColor = vec4(0.6, 0.6, 1.0, 0.2);
vec3 Falloff = vec3(0.4, 3.0, 20.0);
//RGBA of our diffuse color
vec4 DiffuseColor = Texel( u_texture, tc );
//RGB of our normal map
vec3 NormalMap = Texel(u_normals, tc).rgb;
//The delta position of light
vec3 LightDir = vec3(LightPos.xy - (pixel_coords.xy / Resolution.xy), LightPos.z);
//Correct for aspect ratio
LightDir.x *= Resolution.x / Resolution.y;
//Determine distance (used for attenuation) BEFORE we normalize our LightDir
float D = length(LightDir);
//normalize our vectors
vec3 N = normalize(NormalMap * 2.0 - 1.0);
vec3 L = normalize(LightDir);
//Pre-multiply light color with intensity
//Then perform "N dot L" to determine our diffuse term
//vec3 Diffuse = (LightColor.rgb * LightColor.a) * max(dot(N, L), 0.0);
vec3 Diffuse = (LightColor.rgb * LightColor.a);
//pre-multiply ambient color with intensity
vec3 Ambient = AmbientColor.rgb * AmbientColor.a;
//calculate attenuation
float Attenuation = 1.0 / ( Falloff.x + (Falloff.y*D) + (Falloff.z*D*D) );
//the calculation which brings it all together
vec3 Intensity = Ambient + Diffuse * Attenuation;
vec3 FinalColor = DiffuseColor.rgb * Intensity;
return vec4(FinalColor, DiffuseColor.a);
//the following can be ignored:
//the following can be ignored:
//the following can be ignored:
vec4 pixel = Texel( texture, tc );
float d2 = clamp(dia,0,10);
float root = sqrt((pos[0]-tc.x)*(pos[0]-tc.x)+(pos[1]-tc.y)*(pos[1]-tc.y))/d2;
pixel.r = pixel.r - root;
pixel.g = pixel.g - root;
pixel.b = pixel.b - root;
if (pixel.a > 0.0 ) { pixel.a = 1 - root; }
//return pixel;
}
]]
end
I would love any help you could provide.
