Revert "Merge pull request #5 from gmarty/clsc"

Pretty much all of this was completely wrong.

Changing the clear in flip_screen screws up the black border color
Clearing the canvas to a palette color screws up the shaders
They expect 0-15, not a palette color
----
Fix cls() not resetting the clip
Fix clip not requiring all 4 parameters
Clean up clip()

api.lua

@@ -47,11 +47,11 @@ function api.camera(x, y)
 end
 
 function api.clip(x, y, w, h)
-	if x and x~="" then
+	if x and y and w and h then
 		love.graphics.setScissor(x, y, w, h)
 		pico8.clip={x, y, w, h}
 	else
-		love.graphics.setScissor(0, 0, pico8.resolution[1], pico8.resolution[2])
+		love.graphics.setScissor()
 		pico8.clip=nil
 	end
 end
@@ -62,8 +62,9 @@ function api.cls(c)
 		c = 0
 	end
 
-	pico8.clsc = pico8.palette[c+1]
-	love.graphics.clear(pico8.clsc)
+	pico8.clip=nil
+	love.graphics.setScissor()
+	love.graphics.clear(c, 0, 0, 255)
 	pico8.cursor={0, 0}
 end
 

main.lua

@@ -20,7 +20,6 @@ pico8={
 		{255,119,168,255},
 		{255,204,170,255}
 	},
-	clsc={0,  0,  0,  255},
 	spriteflags={},
 	audio_channels={},
 	sfx={},
@@ -381,7 +380,7 @@ function flip_screen()
 	-- love.graphics.setColor(255, 255, 255, 255)
 	love.graphics.setScissor()
 
-	love.graphics.clear(pico8.clsc)
+	love.graphics.clear()
 
 	local screen_w, screen_h=love.graphics.getDimensions()
 	if screen_w>screen_h then