diff options
Diffstat (limited to 'source/blender/draw/intern/shaders/common_pointcloud_lib.glsl')
-rw-r--r-- | source/blender/draw/intern/shaders/common_pointcloud_lib.glsl | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/source/blender/draw/intern/shaders/common_pointcloud_lib.glsl b/source/blender/draw/intern/shaders/common_pointcloud_lib.glsl new file mode 100644 index 00000000000..625e8bb1ff8 --- /dev/null +++ b/source/blender/draw/intern/shaders/common_pointcloud_lib.glsl @@ -0,0 +1,39 @@ + +/* NOTE: To be used with UNIFORM_RESOURCE_ID and INSTANCED_ATTR as define. */ +#pragma BLENDER_REQUIRE(common_view_lib.glsl) + +in vec4 pos; /* Position and radius. */ + +/* ---- Instanced attribs ---- */ + +in vec3 pos_inst; +in vec3 nor; + +mat3 pointcloud_get_facing_matrix(vec3 p) +{ + mat3 facing_mat; + facing_mat[2] = normalize(ViewMatrixInverse[3].xyz - p); + facing_mat[1] = normalize(cross(ViewMatrixInverse[0].xyz, facing_mat[2])); + facing_mat[0] = cross(facing_mat[1], facing_mat[2]); + return facing_mat; +} + +/* Return world position and normal. */ +void pointcloud_get_pos_and_nor(out vec3 outpos, out vec3 outnor) +{ + vec3 p = point_object_to_world(pos.xyz); + mat3 facing_mat = pointcloud_get_facing_matrix(p); + + float radius = dot(abs(mat3(ModelMatrix) * pos.www), vec3(1.0 / 3.0)); + /* TODO(fclem) remove multiplication here. Here only for keeping the size correct for now. */ + radius *= 0.01; + outpos = p + (facing_mat * pos_inst) * radius; + outnor = facing_mat * nor; +} + +vec3 pointcloud_get_pos(void) +{ + vec3 outpos, outnor; + pointcloud_get_pos_and_nor(outpos, outnor); + return outpos; +} |