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uniform mat3 NormalMatrix;
uniform mat4 ViewMatrix;
uniform mat4 ProjectionMatrix;
uniform vec2 viewportSize;
/* ---- Instanciated Attribs ---- */
in vec3 pos;
in vec3 nor;
in vec3 snor;
/* ---- Per instance Attribs ---- */
in mat4 InstanceModelMatrix;
in vec4 outlineColorSize;
out vec4 pPos;
out vec3 vPos;
out vec2 ssPos;
out vec2 ssNor;
out vec4 vColSize;
/* project to screen space */
vec2 proj(vec4 pos)
{
return (0.5 * (pos.xy / pos.w) + 0.5) * viewportSize;
}
void main()
{
/* This is slow and run per vertex, but it's still faster than
* doing it per instance on CPU and sending it on via instance attrib */
mat3 NormalMatrix = transpose(inverse(mat3(ViewMatrix * InstanceModelMatrix)));
vec4 viewpos = ViewMatrix * (InstanceModelMatrix * vec4(pos, 1.0));
vPos = viewpos.xyz;
pPos = ProjectionMatrix * viewpos;
/* TODO FIX: there is still a problem with this vector
* when the bone is scaled or in persp mode. But it's
* barelly visible at the outline corners. */
ssNor = normalize((NormalMatrix * snor).xy);
ssPos = proj(pPos);
vColSize = outlineColorSize;
}
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