+++ /dev/null
-/* -*- C++ -*- ------------------------------------------------------------
-
-Copyright (c) 2007 Jesse Anders and Demian Nave http://cmldev.net/
-
-The Configurable Math Library (CML) is distributed under the terms of the
-Boost Software License, v1.0 (see cml/LICENSE for details).
-
- *-----------------------------------------------------------------------*/
-/** @file
- * @brief
- */
-
-#ifndef picking_h
-#define picking_h
-
-#include <cml/mathlib/projection.h>
-
-/* Functions for picking with rays, volumes, and drag-enclosed volumes. */
-
-namespace cml {
-
-/* Support function for extracting the near and far depth range values from
- * a viewport matrix.
- */
-
-namespace detail {
-
-// NOTE: Changed 'near' and 'far' to 'n' and 'f' to work around windows.h
-// 'near' and 'far' macros.
-
-template < class MatT, typename Real > void
-depth_range_from_viewport_matrix(const MatT& viewport, Real& n, Real& f)
-{
- detail::CheckMatHomogeneous3D(viewport);
-
- n = viewport.basis_element(3,2);
- f = viewport.basis_element(2,2) + n;
-}
-
-} // namespace detail
-
-/* Make a pick ray given screen coordinates and view, projection, and viewport
- * matrices. The origin of the ray lies in the near plane of the frustum; the
- * direction vector extends to the far plane if 'normalize' is false, and is
- * made unit-length if 'normalize' is true (its default value).
- *
- * Note that the origin of the ray lies in the near plane rather than
- * coinciding with the position of the virtual camera, as the latter gives
- * incorrect results when the projection is orthographic.
- *
- * Note also that the screen y coordinate increases from bottom to top rather
- * than top to bottom. If mouse coordinates are returned in window space where
- * the y coordinate increases from top to bottom (as is often the case), the
- * y value should be recomputed as 'y = <window height> - y' before being
- * submitted to this function.
- */
-
-template < class MatT_1, class MatT_2, class MatT_3, typename E, class A >
-void make_pick_ray(
- E pick_x,
- E pick_y,
- const MatT_1& view,
- const MatT_2& projection,
- const MatT_3& viewport,
- vector<E,A>& origin,
- vector<E,A>& direction,
- bool normalize = true)
-{
- typedef vector<E,A> vector_type;
- typedef typename vector_type::value_type value_type;
-
- // NOTE: Changed 'near' and 'far' to 'n' and 'f' to work around
- // windows.h 'near' and 'far' macros.
- value_type n, f;
- detail::depth_range_from_viewport_matrix(viewport, n, f);
-
- origin =
- unproject_point(
- view,projection,viewport,vector_type(pick_x,pick_y,n)
- );
- direction =
- unproject_point(
- view,projection,viewport,vector_type(pick_x,pick_y,f)
- ) - origin;
- if (normalize) {
- direction.normalize();
- }
-}
-
-/* Make a pick volume given the screen coordinates of the center of the
- * picking rect, the width and height of the picking rect, and view and
- * projection matrices.
- *
- * The volume is loaded into the 'planes' array. The planes are of the form
- * ax+by+cz+d = 0, and are in the order left, right, bottom, top, near, far.
- *
- * The z_clip argument should be either z_clip_neg_one or z_clip_zero, and
- * should correspond to the near z-clipping range of the projection matrix
- * argument.
- *
- * The 'normalize' argument indicates whether the output planes should be
- * normalized; its default value is 'true'.
- *
- * Note that the screen y coordinate increases from bottom to top rather
- * than top to bottom. If mouse coordinates are returned in window space where
- * the y coordinate increases from top to bottom (as is often the case), the
- * y value should be recomputed as 'y = <window height> - y' before being
- * submitted to this function.
- */
-
-template < class MatT_1, class MatT_2, typename Real >
-void make_pick_volume(
- Real pick_x,
- Real pick_y,
- Real pick_width,
- Real pick_height,
- Real viewport_x,
- Real viewport_y,
- Real viewport_width,
- Real viewport_height,
- const MatT_1& view,
- const MatT_2& projection,
- Real planes[6][4],
- ZClip z_clip,
- bool normalize = true)
-{
- // FIXME: Should be promoted type...
- typedef matrix<
- Real, fixed<4,4>,
- typename MatT_1::basis_orient, typename MatT_1::layout >
- matrix_type;
-
- matrix_type pick;
- matrix_pick(
- pick, pick_x, pick_y, pick_width, pick_height,
- viewport_x, viewport_y, viewport_width, viewport_height
- );
- cml::extract_frustum_planes(
- view,detail::matrix_concat_transforms_4x4(projection,pick),
- planes,z_clip,normalize);
-}
-
-/* Make a pick volume given two opposite corners of a rectangle in screen
- * space, and view and projection matrices. The corners of the screen rect
- * need not be in any particular 'order' with regard to the values of the
- * coordinates.
- *
- * The volume is loaded into the 'planes' array. The planes are of the form
- * ax+by+cz+d = 0, and are in the order left, right, bottom, top, near, far.
- *
- * The z_clip argument should be either z_clip_neg_one or z_clip_zero, and
- * should correspond to the near z-clipping range of the projection matrix
- * argument.
- *
- * The 'normalize' argument indicates whether the output planes should be
- * normalized; its default value is 'true'.
- *
- * Note that the screen y coordinate increases from bottom to top rather
- * than top to bottom. If mouse coordinates are returned in window space where
- * the y coordinate increases from top to bottom (as is often the case), the
- * y value should be recomputed as 'y = <window height> - y' before being
- * submitted to this function.
- */
-
-template < class MatT_1, class MatT_2, typename Real >
-void make_pick_drag_volume(
- Real pick_x1,
- Real pick_y1,
- Real pick_x2,
- Real pick_y2,
- Real viewport_x,
- Real viewport_y,
- Real viewport_width,
- Real viewport_height,
- const MatT_1& view,
- const MatT_2& projection,
- Real planes[6][4],
- ZClip z_clip,
- bool normalize = true)
-{
- typedef Real value_type;
-
- make_pick_volume(
- (pick_x1+pick_x2)*value_type(.5),
- (pick_y1+pick_y2)*value_type(.5),
- std::fabs(pick_x2-pick_x1),
- std::fabs(pick_y2-pick_y1),
- viewport_x, viewport_y, viewport_width, viewport_height,
- view, projection, planes, z_clip, normalize
- );
-}
-
-} // namespace cml
-
-#endif
projects / chaz / yoink / blobdiff