2D Outline Shader (SpriteRender vs Quad)
I've got a pretty simple outline shader for 2D sprites going. If alpha pixel, look for surrounding pixels for non alpha pixel (see code below).
It works fine on a quad (left) but not on SpriteRenderer (right). I need it to work with sprite renderers in Unity. It's like the SpriteRenderer creates a different mesh based on the sprite/texture used in it. Anyone know what I'm missing!?
It works fine on a quad (left) but not on SpriteRenderer (right). I need it to work with sprite renderers in Unity. It's like the SpriteRenderer creates a different mesh based on the sprite/texture used in it. Anyone know what I'm missing!?
fixed4 SampleSpriteTexture (float2 uv)
{
fixed4 color = tex2D (_MainTex, uv);
return color;
}
fixed4 frag(v2f IN) : COLOR
{
fixed4 c = SampleSpriteTexture (IN.texcoord) * IN.color;
c.rgb *= c.a;
fixed4 outlineC = _OutlineColor;
outlineC.rgb *= outlineC.a;
//outlineC.a *= ceil(c.a);
if (c.a == 0.0)
{
fixed upAlpha = SampleSpriteTexture ( IN.texcoord + fixed2(0, _OutlineThickness)).a;
fixed downAlpha = SampleSpriteTexture ( IN.texcoord - fixed2(0, _OutlineThickness)).a;
fixed rightAlpha = SampleSpriteTexture ( IN.texcoord + fixed2(_OutlineThickness, 0)).a;
fixed leftAlpha = SampleSpriteTexture ( IN.texcoord - fixed2(_OutlineThickness, 0)).a;
fixed upRightAlpha = SampleSpriteTexture ( IN.texcoord - fixed2(_OutlineThickness, _OutlineThickness)).a;
fixed upLeftAlpha = SampleSpriteTexture ( IN.texcoord - fixed2(_OutlineThickness, -_OutlineThickness)).a;
fixed downRightAlpha = SampleSpriteTexture ( IN.texcoord - fixed2(-_OutlineThickness, _OutlineThickness)).a;
fixed downLeftAlpha = SampleSpriteTexture ( IN.texcoord - fixed2(-_OutlineThickness, -_OutlineThickness)).a;
if (upAlpha != 0.0|| downAlpha != 0.0 || rightAlpha != 0.0 || leftAlpha != 0.0 || upRightAlpha != 0.0 || upLeftAlpha != 0.0 || downLeftAlpha != 0.0 || downRightAlpha != 0.0)
return outlineC;
}
return c;
}
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