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#pragma BLENDER_REQUIRE(common_view_clipping_lib.glsl)
#pragma BLENDER_REQUIRE(common_view_lib.glsl)
/* project to screen space */
vec2 proj(vec4 pos)
{
return (0.5 * (pos.xy / pos.w) + 0.5) * sizeViewport.xy;
}
void main()
{
vec4 bone_color, state_color;
mat4 model_mat = extract_matrix_packed_data(inst_obmat, state_color, bone_color);
mat4 model_view_matrix = ViewMatrix * model_mat;
mat4 sphereMatrix = inverse(model_view_matrix);
bool is_persp = (ProjectionMatrix[3][3] == 0.0);
/* This is the local space camera ray (not normalize).
* In perspective mode it's also the viewspace position
* of the sphere center. */
vec3 cam_ray = (is_persp) ? model_view_matrix[3].xyz : vec3(0.0, 0.0, -1.0);
cam_ray = mat3(sphereMatrix) * cam_ray;
/* Sphere center distance from the camera (persp) in local space. */
float cam_dist = length(cam_ray);
/* Compute view aligned orthonormal space. */
vec3 z_axis = cam_ray / cam_dist;
vec3 x_axis = normalize(cross(sphereMatrix[1].xyz, z_axis));
vec3 y_axis = cross(z_axis, x_axis);
float z_ofs = 0.0;
if (is_persp) {
/* For perspective, the projected sphere radius
* can be bigger than the center disc. Compute the
* max angular size and compensate by sliding the disc
* towards the camera and scale it accordingly. */
const float half_pi = 3.1415926 * 0.5;
const float rad = 0.05;
/* Let be (in local space):
* V the view vector origin.
* O the sphere origin.
* T the point on the target circle.
* We compute the angle between (OV) and (OT). */
float a = half_pi - asin(rad / cam_dist);
float cos_b = cos(a);
float sin_b = sqrt(clamp(1.0 - cos_b * cos_b, 0.0, 1.0));
x_axis *= sin_b;
y_axis *= sin_b;
z_ofs = -rad * cos_b;
}
/* Camera oriented position (but still in local space) */
vec3 cam_pos0 = x_axis * pos.x + y_axis * pos.y + z_axis * z_ofs;
vec4 V = model_view_matrix * vec4(cam_pos0, 1.0);
gl_Position = ProjectionMatrix * V;
vec4 center = ProjectionMatrix * vec4(model_view_matrix[3].xyz, 1.0);
/* Offset away from the center to avoid overlap with solid shape. */
vec2 ofs_dir = normalize(proj(gl_Position) - proj(center));
gl_Position.xy += ofs_dir * drw_view.viewport_size_inverse * gl_Position.w;
edgeStart = edgePos = proj(gl_Position);
finalColor = vec4(bone_color.rgb, 1.0);
vec4 world_pos = model_mat * vec4(cam_pos0, 1.0);
view_clipping_distances(world_pos.xyz);
}
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