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Initial commit of Command & Conquer Renegade source code.

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/*
** Command & Conquer Renegade(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/***********************************************************************************************
*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
***********************************************************************************************
* *
* Project Name : WWMath *
* *
* $Archive:: /Commando/Code/wwmath/frustum.cpp $*
* *
* Author:: Greg Hjelstrom *
* *
* $Modtime:: 4/01/01 12:47p $*
* *
* $Revision:: 5 $*
* *
*---------------------------------------------------------------------------------------------*
* Functions: *
* FrustumClass::Init -- Initialize a frustum object *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "frustum.h"
/***********************************************************************************************
* FrustumClass::Init -- Initialize a frustum object *
* *
* This function initializes a frustum from the description of a camera *
* *
* INPUT: *
* camera - camera transform, note that the camera looks down the -Z axis *
* vpmin - min corner of the z=-1.0 view plane (not necessarily the near clip plane) *
* vpmax - max corner of the z=-1.0 view plane (not necessarily the near clip plane) *
* znear - near clip plane (should be negative, negated if it is not) *
* zfar - far clip plane (should be negative, negated if it is not) *
* *
* OUTPUT: *
* *
* WARNINGS: *
* The vpmin and vpmax variables are the min and max of a view-plane at z=-1.0 *
* *
* *
* HISTORY: *
* 2/17/2000 gth : Created. *
*=============================================================================================*/
void FrustumClass::Init
(
const Matrix3D & camera,
const Vector2 & vpmin,
const Vector2 & vpmax,
float znear,
float zfar
)
{
int i;
// Store the camera transform
CameraTransform = camera;
// Forward is negative Z in our viewspace coordinate system.
// Just flip the sign if the user passed in positive values.
if ((znear > 0.0f) && (zfar > 0.0f)) {
znear = -znear;
zfar = -zfar;
}
// Calculate the corners of the camera frustum.
// Generate the camera-space frustum corners by linearly
// extrapolating the viewplane to the near and far z clipping planes.
// The camera frustum corners are defined in the following order:
// When looking at the frustum from the position of the camera, the near four corners are
// numbered: upper left 0, upper right 1, lower left 2, lower right 3. The far plane's
// Frustum corners are numbered from 4 to 7 in an analogous fashion.
// (remember: the camera space has x going to the right, y up and z backwards).
Corners[0].Set(vpmin.X, vpmax.Y, 1.0);
Corners[4] = Corners[0];
Corners[0] *= znear;
Corners[4] *= zfar;
Corners[1].Set(vpmax.X, vpmax.Y, 1.0);
Corners[5] = Corners[1];
Corners[1] *= znear;
Corners[5] *= zfar;
Corners[2].Set(vpmin.X, vpmin.Y, 1.0);
Corners[6] = Corners[2];
Corners[2] *= znear;
Corners[6] *= zfar;
Corners[3].Set(vpmax.X, vpmin.Y, 1.0);
Corners[7] = Corners[3];
Corners[3] *= znear;
Corners[7] *= zfar;
// Transform the eight corners of the view frustum from camera space to world space.
for (i = 0; i < 8; i++) {
Matrix3D::Transform_Vector(CameraTransform, Corners[i], &(Corners[i]));
}
// Create the six frustum bounding planes from the eight corner Corners.
// The bounding planes are oriented so that their normals point outward
PlaneClass frustum_planes[6];
Planes[0].Set(Corners[0], Corners[3], Corners[1]); // near
Planes[1].Set(Corners[0], Corners[5], Corners[4]); // bottom
Planes[2].Set(Corners[0], Corners[6], Corners[2]); // right
Planes[3].Set(Corners[2], Corners[7], Corners[3]); // top
Planes[4].Set(Corners[1], Corners[7], Corners[5]); // left
Planes[5].Set(Corners[4], Corners[7], Corners[6]); // far
// find the bounding box of the entire frustum (may be used for sloppy quick rejection)
BoundMin = BoundMax = Corners[0];
for (i=1; i<8;i++) {
if (Corners[i].X < BoundMin.X) BoundMin.X = Corners[i].X;
if (Corners[i].X > BoundMax.X) BoundMax.X = Corners[i].X;
if (Corners[i].Y < BoundMin.Y) BoundMin.Y = Corners[i].Y;
if (Corners[i].Y > BoundMax.Y) BoundMax.Y = Corners[i].Y;
if (Corners[i].Z < BoundMin.Z) BoundMin.Z = Corners[i].Z;
if (Corners[i].Z > BoundMax.Z) BoundMax.Z = Corners[i].Z;
}
}