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in vec4 uvcoordsvar;
out vec4 FragColor;
uniform sampler2D outlineColor;
uniform sampler2D outlineDepth;
uniform float alpha;
uniform bool doExpand;
void search_outline(ivec2 uv, inout bool found_edge)
{
if (!found_edge) {
vec4 color = texelFetch(outlineColor, uv, 0).rgba;
if (color.a != 0.0) {
if (doExpand || color.a != 1.0) {
FragColor = color;
found_edge = true;
}
}
}
}
void main()
{
ivec2 uv = ivec2(gl_FragCoord.xy);
FragColor = texelFetch(outlineColor, uv, 0).rgba;
float depth = texelFetch(outlineDepth, uv, 0).r;
if (FragColor.a != 0.0 || (depth == 1.0 && !doExpand))
return;
bool found_edge = false;
search_outline(uv + ivec2( 1, 0), found_edge);
search_outline(uv + ivec2( 0, 1), found_edge);
search_outline(uv + ivec2(-1, 0), found_edge);
search_outline(uv + ivec2( 0, -1), found_edge);
/* We Hit something ! */
if (found_edge) {
/* only change alpha */
FragColor.a *= alpha;
}
}
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