+++ /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 matrix_projection_h
-#define matrix_projection_h
-
-#include <cml/mathlib/checking.h>
-#include <cml/mathlib/helper.h>
-
-/* Functions for building matrix transforms other than rotations
- * (matrix_rotation.h) and viewing projections (matrix_projection.h).
- *
- * @todo: Clean up comments and documentation throughout.
- */
-
-// NOTE: Changed 'near' and 'far' to 'n' and 'f' throughout to work around
-// windows.h 'near' and 'far' macros.
-
-namespace cml {
-
-//////////////////////////////////////////////////////////////////////////////
-// 3D perspective projection from frustum
-//////////////////////////////////////////////////////////////////////////////
-
-/** Build a matrix representing a perspective projection, specified by frustum
- * bounds in l,r,b,t,n,f form, and with the given handedness and z clipping
- * range
- */
-template < typename E, class A, class B, class L > void
-matrix_perspective(matrix<E,A,B,L>& m, E left, E right, E bottom, E top,
- E n, E f, Handedness handedness,
- ZClip z_clip)
-{
- typedef matrix<E,A,B,L> matrix_type;
- typedef typename matrix_type::value_type value_type;
-
- /* Checking */
- detail::CheckMatHomogeneous3D(m);
-
- identity_transform(m);
-
- value_type inv_width = value_type(1) / (right - left);
- value_type inv_height = value_type(1) / (top - bottom);
- value_type inv_depth = value_type(1) / (f - n);
- value_type near2 = value_type(2) * n;
- value_type s = handedness == left_handed ? 1 : -1;
-
- if (z_clip == z_clip_neg_one) {
- m.set_basis_element(2,2,s * (f + n) * inv_depth);
- m.set_basis_element(3,2,value_type(-2) * f * n * inv_depth);
- } else { // z_clip == z_clip_zero
- m.set_basis_element(2,2,s * f * inv_depth);
- m.set_basis_element(3,2,-s * n * m.basis_element(2,2));
- }
-
- m.set_basis_element(0,0,near2 * inv_width );
- m.set_basis_element(1,1,near2 * inv_height );
- m.set_basis_element(2,0,-s * (right + left) * inv_width );
- m.set_basis_element(2,1,-s * (top + bottom) * inv_height);
- m.set_basis_element(2,3,s );
- m.set_basis_element(3,3,value_type(0) );
-}
-
-/** Build a matrix representing a perspective projection, specified by frustum
- * bounds in w,h,n,f form, and with the given handedness and z clipping
- * range
- */
-template < typename E, class A, class B, class L > void
-matrix_perspective(matrix<E,A,B,L>& m, E width, E height, E n, E f,
- Handedness handedness, ZClip z_clip)
-{
- typedef matrix<E,A,B,L> matrix_type;
- typedef typename matrix_type::value_type value_type;
-
- value_type half_width = width * value_type(.5);
- value_type half_height = height * value_type(.5);
- matrix_perspective(m, -half_width, half_width,
- -half_height, half_height, n, f, handedness, z_clip);
-}
-
-/** Build a left-handedness frustum perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_LH(matrix<E,A,B,L>& m, E left, E right, E bottom,
- E top, E n, E f, ZClip z_clip)
-{
- matrix_perspective(m, left, right, bottom, top, n, f,
- left_handed, z_clip);
-}
-
-/** Build a right-handedness frustum perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_RH(matrix<E,A,B,L>& m, E left, E right, E bottom,
- E top, E n, E f, ZClip z_clip)
-{
- matrix_perspective(m, left, right, bottom, top, n, f,
- right_handed, z_clip);
-}
-
-/** Build a left-handedness frustum perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_LH(matrix<E,A,B,L>& m, E width, E height, E n,
- E f, ZClip z_clip)
-{
- matrix_perspective(m, width, height, n, f, left_handed, z_clip);
-}
-
-/** Build a right-handedness frustum perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_RH(matrix<E,A,B,L>& m, E width, E height, E n,
- E f, ZClip z_clip)
-{
- matrix_perspective(m, width, height, n, f, right_handed, z_clip);
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// 3D perspective projection from horizontal field of view
-//////////////////////////////////////////////////////////////////////////////
-
-/** Build a perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_xfov(matrix<E,A,B,L>& m, E xfov, E aspect, E n,
- E f, Handedness handedness, ZClip z_clip)
-{
- typedef matrix<E,A,B,L> matrix_type;
- typedef typename matrix_type::value_type value_type;
-
- value_type width = value_type(2) * std::tan(xfov * value_type(.5)) * n;
- matrix_perspective(m, width, width / aspect, n, f,
- handedness, z_clip);
-}
-
-/** Build a left-handedness perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_xfov_LH(matrix<E,A,B,L>& m, E xfov, E aspect, E n,
- E f, ZClip z_clip)
-{
- matrix_perspective_xfov(m,xfov,aspect,n,f,left_handed,z_clip);
-}
-
-/** Build a right-handedness perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_xfov_RH(matrix<E,A,B,L>& m, E xfov, E aspect, E n,
- E f, ZClip z_clip)
-{
- matrix_perspective_xfov(m,xfov,aspect,n,f,right_handed,z_clip);
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// 3D perspective projection from vertical field of view
-//////////////////////////////////////////////////////////////////////////////
-
-/** Build a perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_yfov(matrix<E,A,B,L>& m, E yfov, E aspect, E n,
- E f, Handedness handedness, ZClip z_clip)
-{
- typedef matrix<E,A,B,L> matrix_type;
- typedef typename matrix_type::value_type value_type;
-
- value_type height = value_type(2) * std::tan(yfov * value_type(.5)) * n;
- matrix_perspective(m, height * aspect, height, n, f,
- handedness, z_clip);
-}
-
-/** Build a left-handedness perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_yfov_LH(matrix<E,A,B,L>& m, E yfov, E aspect, E n,
- E f, ZClip z_clip)
-{
- matrix_perspective_yfov(m,yfov,aspect,n,f,left_handed,z_clip);
-}
-
-/** Build a right-handedness perspective matrix */
-template < typename E, class A, class B, class L > void
-matrix_perspective_yfov_RH(matrix<E,A,B,L>& m, E yfov, E aspect, E n,
- E f, ZClip z_clip)
-{
- matrix_perspective_yfov(m,yfov,aspect,n,f,right_handed,z_clip);
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// 3D orthographic projection from frustum
-//////////////////////////////////////////////////////////////////////////////
-
-/** Build a matrix representing an orthographic projection, specified by
- * frustum bounds in l,r,b,t,n,f form, and with the given handedness and z
- * clipping range
- */
-
-template < typename E, class A, class B, class L > void
-matrix_orthographic(matrix<E,A,B,L>& m, E left, E right, E bottom, E top,
- E n, E f, Handedness handedness,
- ZClip z_clip)
-{
- typedef matrix<E,A,B,L> matrix_type;
- typedef typename matrix_type::value_type value_type;
-
- /* Checking */
- detail::CheckMatHomogeneous3D(m);
-
- identity_transform(m);
-
- value_type inv_width = value_type(1) / (right - left);
- value_type inv_height = value_type(1) / (top - bottom);
- value_type inv_depth = value_type(1) / (f - n);
- value_type s = handedness == left_handed ? 1 : -1;
-
- if (z_clip == z_clip_neg_one) {
- m.set_basis_element(2,2,s * value_type(2) * inv_depth);
- m.set_basis_element(3,2,-(f + n) * inv_depth);
- } else { // z_clip.z_clip() == 0
- m.set_basis_element(2,2,s * inv_depth);
- m.set_basis_element(3,2,-n * inv_depth);
- }
-
- m.set_basis_element(0,0,value_type(2) * inv_width );
- m.set_basis_element(1,1,value_type(2) * inv_height );
- m.set_basis_element(3,0,-(right + left) * inv_width );
- m.set_basis_element(3,1,-(top + bottom) * inv_height);
-}
-
-/** Build an orthographic projection matrix */
-template < typename E, class A, class B, class L > void
-matrix_orthographic(matrix<E,A,B,L>& m, E width, E height, E n, E f,
- Handedness handedness, ZClip z_clip)
-{
- typedef matrix<E,A,B,L> matrix_type;
- typedef typename matrix_type::value_type value_type;
-
- value_type half_width = width * value_type(.5);
- value_type half_height = height * value_type(.5);
- matrix_orthographic(m, -half_width, half_width,
- -half_height, half_height, n, f, handedness, z_clip);
-}
-
-/** Build a left-handedness orthographic projection matrix */
-template < typename E, class A, class B, class L > void
-matrix_orthographic_LH(matrix<E,A,B,L>& m, E left, E right, E bottom,
- E top, E n, E f, ZClip z_clip)
-{
- matrix_orthographic(m, left, right, bottom, top, n, f,
- left_handed, z_clip);
-}
-
-/** Build a right-handedness orthographic projection matrix */
-template < typename E, class A, class B, class L > void
-matrix_orthographic_RH(matrix<E,A,B,L>& m, E left, E right, E bottom,
- E top, E n, E f, ZClip z_clip)
-{
- matrix_orthographic(m, left, right, bottom, top, n, f,
- right_handed, z_clip);
-}
-
-/** Build a left-handedness orthographic projection matrix */
-template < typename E, class A, class B, class L > void
-matrix_orthographic_LH(matrix<E,A,B,L>& m, E width, E height, E n,
- E f, ZClip z_clip)
-{
- matrix_orthographic(m, width, height, n, f, left_handed,
- z_clip);
-}
-
-/** Build a right-handedness orthographic projection matrix */
-template < typename E, class A, class B, class L > void
-matrix_orthographic_RH(matrix<E,A,B,L>& m, E width, E height, E n,
- E f, ZClip z_clip)
-{
- matrix_orthographic(m, width, height, n, f, right_handed,
- z_clip);
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// 3D viewport
-//////////////////////////////////////////////////////////////////////////////
-
-/* Build a viewport matrix
- *
- * Note: A viewport matrix is in a sense the opposite of an orthographics
- * projection matrix, and can be build by constructing and inverting the
- * latter.
- *
- * @todo: Need to look into D3D viewport conventions and see if this needs to
- * be adapted accordingly.
- */
-
-template < typename E, class A, class B, class L > void
-matrix_viewport(matrix<E,A,B,L>& m, E left, E right, E bottom,
- E top, ZClip z_clip, E n = E(0), E f = E(1))
-{
- matrix_orthographic_LH(m, left, right, bottom, top, n, f, z_clip);
- /* @todo: invert(m), when available */
- m = inverse(m);
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// 3D picking volume
-//////////////////////////////////////////////////////////////////////////////
-
-/* Build a pick volume matrix
- *
- * When post-concatenated with a projection matrix, the pick matrix modifies
- * the view volume to create a 'picking volume'. This volume corresponds to
- * a screen rectangle centered at (pick_x, pick_y) and with dimensions
- * pick_widthXpick_height.
- *
- * @todo: Representation of viewport between this function and
- * matrix_viewport() is inconsistent (position and dimensions vs. bounds).
- * Should this be addressed?
- */
-
-template < typename E, class A, class B, class L > void
-matrix_pick(
- matrix<E,A,B,L>& m, E pick_x, E pick_y, E pick_width, E pick_height,
- E viewport_x, E viewport_y, E viewport_width, E viewport_height)
-{
- typedef matrix<E,A,B,L> matrix_type;
- typedef typename matrix_type::value_type value_type;
-
- /* Checking */
- detail::CheckMatHomogeneous3D(m);
-
- identity_transform(m);
-
- value_type inv_width = value_type(1) / pick_width;
- value_type inv_height = value_type(1) / pick_height;
-
- m.set_basis_element(0,0,viewport_width*inv_width);
- m.set_basis_element(1,1,viewport_height*inv_height);
- m.set_basis_element(3,0,
- (viewport_width+value_type(2)*(viewport_x-pick_x))*inv_width);
- m.set_basis_element(3,1,
- (viewport_height+value_type(2)*(viewport_y-pick_y))*inv_height);
-}
-
-} // namespace cml
-
-#endif
projects / chaz / yoink / blobdiff