88 lines
2.1 KiB
GLSL
88 lines
2.1 KiB
GLSL
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layout(lines_adjacency) in;
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layout(triangle_strip, max_vertices = 6) out;
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in vec4 pPos[];
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in vec3 vPos[];
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in vec2 ssPos[];
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in vec2 ssNor[];
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in vec4 vColSize[];
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flat out vec4 finalColor;
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uniform mat4 ProjectionMatrix;
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uniform vec2 viewportSize;
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uniform float lineThickness = 2.0;
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vec2 compute_dir(vec2 v0, vec2 v1)
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{
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vec2 dir = normalize(v1 - v0);
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dir = vec2(-dir.y, dir.x);
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return dir;
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}
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void emit_edge(vec2 edge_dir, vec2 hidden_dir, vec2 thick, bool is_persp)
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{
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float fac = dot(-hidden_dir, edge_dir);
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vec2 t = thick * (is_persp ? abs(vPos[1].z) : 1.0);
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gl_Position = pPos[1];
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EmitVertex();
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gl_Position.xy += t * edge_dir * sign(fac);
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EmitVertex();
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t = thick * (is_persp ? abs(vPos[2].z) : 1.0);
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gl_Position = pPos[2];
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EmitVertex();
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gl_Position.xy += t * edge_dir * sign(fac);
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EmitVertex();
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}
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void emit_corner(const int e, vec2 thick, bool is_persp)
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{
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vec2 corner_dir = ssNor[e];
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vec2 t = thick * (is_persp ? abs(vPos[e].z) : 1.0);
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gl_Position = pPos[e] + vec4(t * corner_dir, 0.0, 0.0);
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EmitVertex();
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}
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void main(void)
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{
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finalColor = vec4(vColSize[0].rgb, 1.0);
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bool is_persp = (ProjectionMatrix[3][3] == 0.0);
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vec3 view_vec = (is_persp) ? normalize(vPos[1]) : vec3(0.0, 0.0, -1.0);
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vec3 v10 = vPos[0] - vPos[1];
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vec3 v12 = vPos[2] - vPos[1];
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vec3 v13 = vPos[3] - vPos[1];
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vec3 n0 = cross(v12, v10);
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vec3 n3 = cross(v13, v12);
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float fac0 = dot(view_vec, n0);
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float fac3 = dot(view_vec, n3);
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/* If both adjacent verts are facing the camera the same way,
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* then it isn't an outline edge. */
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if (sign(fac0) == sign(fac3))
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return;
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/* Don't outline if concave edge. */
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if (dot(n0, v13) > 0.0001)
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return;
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vec2 thick = vColSize[0].w * (lineThickness / viewportSize);
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vec2 edge_dir = compute_dir(ssPos[1], ssPos[2]);
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/* Take the farthest point to compute edge direction
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* (avoid problems with point behind near plane). */
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vec2 hidden_point = (vPos[0].z < vPos[3].z) ? ssPos[0] : ssPos[3];
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vec2 hidden_dir = normalize(hidden_point - ssPos[1]);
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emit_corner(1, thick, is_persp);
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emit_edge(edge_dir, hidden_dir, thick, is_persp);
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emit_corner(2, thick, is_persp);
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EndPrimitive();
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}
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