Ykkrosh
6c7b82130c
Add shift+wheel (and Q/E, and ctrl+arrows, and ctrl+WASD) to rotate the camera. Restrict the rotation and zoom to narrow ranges. (Constraints can be disabled in the dev overlay). Smooth the movement and rotation. Fix some stupid whitespace. Fix some const correctness. This was SVN commit r7930.
390 lines
11 KiB
C++
390 lines
11 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* CCamera holds a view and a projection matrix. It also has a frustum
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* which can be used to cull objects for rendering.
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*/
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#include "precompiled.h"
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#include "Camera.h"
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#include "graphics/HFTracer.h"
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#include "graphics/Terrain.h"
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#include "lib/ogl.h"
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#include "maths/MathUtil.h"
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#include "ps/Game.h"
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#include "ps/World.h"
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#include "renderer/Renderer.h"
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#include "renderer/WaterManager.h"
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CCamera::CCamera ()
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{
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// set viewport to something anything should handle, but should be initialised
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// to window size before use
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m_ViewPort.m_X = 0;
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m_ViewPort.m_Y = 0;
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m_ViewPort.m_Width = 800;
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m_ViewPort.m_Height = 600;
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}
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CCamera::~CCamera ()
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{
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}
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void CCamera::SetProjection (float nearp, float farp, float fov)
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{
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m_NearPlane = nearp;
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m_FarPlane = farp;
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m_FOV = fov;
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float Aspect = (float)m_ViewPort.m_Width/(float)m_ViewPort.m_Height;
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float w = tanf (m_FOV*0.5f*Aspect);
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float h = tanf (m_FOV*0.5f);
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m_ProjMat.SetZero ();
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m_ProjMat._11 = 1/w;
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m_ProjMat._22 = 1/h;
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m_ProjMat._33 = (m_FarPlane+m_NearPlane)/(m_FarPlane-m_NearPlane);
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m_ProjMat._34 = -2*m_FarPlane*m_NearPlane/(m_FarPlane-m_NearPlane);
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m_ProjMat._43 = 1.0f;
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}
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void CCamera::SetProjectionTile (int tiles, int tile_x, int tile_y)
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{
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float Aspect = (float)m_ViewPort.m_Width/(float)m_ViewPort.m_Height;
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float w = tanf (m_FOV*0.5f*Aspect) / tiles;
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float h = tanf (m_FOV*0.5f) / tiles;
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m_ProjMat._11 = 1/w;
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m_ProjMat._22 = 1/h;
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m_ProjMat._13 = -(1-tiles + 2*tile_x);
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m_ProjMat._23 = -(1-tiles + 2*tile_y);
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}
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//Updates the frustum planes. Should be called
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//everytime the view or projection matrices are
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//altered.
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void CCamera::UpdateFrustum ()
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{
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CMatrix3D MatFinal;
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CMatrix3D MatView;
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m_Orientation.GetInverse(MatView);
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MatFinal = m_ProjMat * MatView;
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//get the RIGHT plane
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m_ViewFrustum.SetNumPlanes (6);
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m_ViewFrustum.m_aPlanes[0].m_Norm.X = MatFinal._41-MatFinal._11;
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m_ViewFrustum.m_aPlanes[0].m_Norm.Y = MatFinal._42-MatFinal._12;
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m_ViewFrustum.m_aPlanes[0].m_Norm.Z = MatFinal._43-MatFinal._13;
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m_ViewFrustum.m_aPlanes[0].m_Dist = MatFinal._44-MatFinal._14;
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//get the LEFT plane
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m_ViewFrustum.m_aPlanes[1].m_Norm.X = MatFinal._41+MatFinal._11;
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m_ViewFrustum.m_aPlanes[1].m_Norm.Y = MatFinal._42+MatFinal._12;
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m_ViewFrustum.m_aPlanes[1].m_Norm.Z = MatFinal._43+MatFinal._13;
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m_ViewFrustum.m_aPlanes[1].m_Dist = MatFinal._44+MatFinal._14;
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//get the BOTTOM plane
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m_ViewFrustum.m_aPlanes[2].m_Norm.X = MatFinal._41+MatFinal._21;
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m_ViewFrustum.m_aPlanes[2].m_Norm.Y = MatFinal._42+MatFinal._22;
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m_ViewFrustum.m_aPlanes[2].m_Norm.Z = MatFinal._43+MatFinal._23;
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m_ViewFrustum.m_aPlanes[2].m_Dist = MatFinal._44+MatFinal._24;
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//get the TOP plane
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m_ViewFrustum.m_aPlanes[3].m_Norm.X = MatFinal._41-MatFinal._21;
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m_ViewFrustum.m_aPlanes[3].m_Norm.Y = MatFinal._42-MatFinal._22;
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m_ViewFrustum.m_aPlanes[3].m_Norm.Z = MatFinal._43-MatFinal._23;
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m_ViewFrustum.m_aPlanes[3].m_Dist = MatFinal._44-MatFinal._24;
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//get the FAR plane
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m_ViewFrustum.m_aPlanes[4].m_Norm.X = MatFinal._41-MatFinal._31;
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m_ViewFrustum.m_aPlanes[4].m_Norm.Y = MatFinal._42-MatFinal._32;
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m_ViewFrustum.m_aPlanes[4].m_Norm.Z = MatFinal._43-MatFinal._33;
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m_ViewFrustum.m_aPlanes[4].m_Dist = MatFinal._44-MatFinal._34;
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//get the NEAR plane
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m_ViewFrustum.m_aPlanes[5].m_Norm.X = MatFinal._41+MatFinal._31;
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m_ViewFrustum.m_aPlanes[5].m_Norm.Y = MatFinal._42+MatFinal._32;
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m_ViewFrustum.m_aPlanes[5].m_Norm.Z = MatFinal._43+MatFinal._33;
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m_ViewFrustum.m_aPlanes[5].m_Dist = MatFinal._44+MatFinal._34;
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}
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void CCamera::SetViewPort (const SViewPort& viewport)
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{
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m_ViewPort.m_X = viewport.m_X;
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m_ViewPort.m_Y = viewport.m_Y;
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m_ViewPort.m_Width = viewport.m_Width;
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m_ViewPort.m_Height = viewport.m_Height;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// GetCameraPlanePoints: return four points in camera space at given distance from camera
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void CCamera::GetCameraPlanePoints(float dist,CVector3D pts[4]) const
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{
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float aspect=float(m_ViewPort.m_Width)/float(m_ViewPort.m_Height);
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float x=dist*float(tan(GetFOV()*aspect*0.5));
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float y=dist*float(tan(GetFOV()*0.5));
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pts[0].X=-x;
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pts[0].Y=-y;
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pts[0].Z=dist;
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pts[1].X=x;
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pts[1].Y=-y;
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pts[1].Z=dist;
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pts[2].X=x;
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pts[2].Y=y;
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pts[2].Z=dist;
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pts[3].X=-x;
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pts[3].Y=y;
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pts[3].Z=dist;
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}
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void CCamera::BuildCameraRay(int px, int py, CVector3D& origin, CVector3D& dir) const
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{
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CVector3D cPts[4];
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GetCameraPlanePoints(m_FarPlane, cPts);
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// transform to world space
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CVector3D wPts[4];
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for (int i = 0; i < 4; i++)
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wPts[i] = m_Orientation.Transform(cPts[i]);
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// get world space position of mouse point
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float dx = (float)px / (float)g_Renderer.GetWidth();
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float dz = 1 - (float)py / (float)g_Renderer.GetHeight();
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CVector3D vdx = wPts[1] - wPts[0];
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CVector3D vdz = wPts[3] - wPts[0];
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CVector3D pt = wPts[0] + (vdx * dx) + (vdz * dz);
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// copy origin
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origin = m_Orientation.GetTranslation();
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// build direction
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dir = pt - origin;
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dir.Normalize();
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}
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void CCamera::GetScreenCoordinates(const CVector3D& world, float& x, float& y) const
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{
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CMatrix3D transform;
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m_Orientation.GetInverse(transform);
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transform.Concatenate(m_ProjMat);
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CVector3D screenspace = transform.Transform(world);
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x = screenspace.X / screenspace.Z;
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y = screenspace.Y / screenspace.Z;
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x = (x + 1) * 0.5f * g_Renderer.GetWidth();
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y = (1 - y) * 0.5f * g_Renderer.GetHeight();
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}
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CVector3D CCamera::GetWorldCoordinates(int px, int py, bool aboveWater) const
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{
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CHFTracer tracer(g_Game->GetWorld()->GetTerrain());
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int x, z;
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CVector3D origin, dir, delta, terrainPoint, waterPoint;
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BuildCameraRay(px, py, origin, dir);
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bool gotTerrain = tracer.RayIntersect(origin, dir, x, z, terrainPoint);
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if (!aboveWater)
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{
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if (gotTerrain)
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return terrainPoint;
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// Off the edge of the world?
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// Work out where it /would/ hit, if the map were extended out to infinity with average height.
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return GetWorldCoordinates(px, py, 50.0f);
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}
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CPlane plane;
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plane.Set(CVector3D(0.f, 1.f, 0.f), // upwards normal
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CVector3D(0.f, g_Renderer.GetWaterManager()->m_WaterHeight, 0.f)); // passes through water plane
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bool gotWater = plane.FindRayIntersection( origin, dir, &waterPoint );
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// Clamp the water intersection to within the map's bounds, so that
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// we'll always return a valid position on the map
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ssize_t mapSize = g_Game->GetWorld()->GetTerrain()->GetVerticesPerSide();
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if (gotWater)
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{
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waterPoint.X = clamp(waterPoint.X, 0.f, (float)((mapSize-1)*CELL_SIZE));
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waterPoint.Z = clamp(waterPoint.Z, 0.f, (float)((mapSize-1)*CELL_SIZE));
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}
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if (gotTerrain)
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{
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if (gotWater)
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{
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// Intersecting both heightmap and water plane; choose the closest of those
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if ((origin - terrainPoint).LengthSquared() < (origin - waterPoint).LengthSquared())
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return terrainPoint;
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else
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return waterPoint;
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}
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else
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{
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// Intersecting heightmap but parallel to water plane
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return terrainPoint;
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}
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}
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else
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{
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if (gotWater)
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{
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// Only intersecting water plane
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return waterPoint;
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}
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else
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{
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// Not intersecting terrain or water; just return 0,0,0.
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return CVector3D(0.f, 0.f, 0.f);
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}
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}
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}
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CVector3D CCamera::GetWorldCoordinates(int px, int py, float h) const
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{
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CPlane plane;
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plane.Set(CVector3D(0.f, 1.f, 0.f), CVector3D(0.f, h, 0.f)); // upwards normal, passes through h
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CVector3D origin, dir, delta, currentTarget;
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BuildCameraRay(px, py, origin, dir);
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if (plane.FindRayIntersection(origin, dir, ¤tTarget))
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return currentTarget;
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// No intersection with the infinite plane - nothing sensible can be returned,
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// so just choose an arbitrary point on the plane
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return CVector3D(0.f, h, 0.f);
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}
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CVector3D CCamera::GetFocus()
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{
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// Basically the same as GetWorldCoordinates
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CHFTracer tracer(g_Game->GetWorld()->GetTerrain());
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int x, z;
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CVector3D origin, dir, delta, currentTarget;
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origin = m_Orientation.GetTranslation();
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dir = m_Orientation.GetIn();
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if (tracer.RayIntersect(origin, dir, x, z, currentTarget))
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return (currentTarget);
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// Off the edge of the world?
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// Work out where it /would/ hit, if the map were extended out to infinity with average height.
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return (origin + dir * ((50.0f - origin.Y) / dir.Y));
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}
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void CCamera::LookAt(const CVector3D& camera, const CVector3D& target, const CVector3D& up)
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{
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CVector3D delta = target - camera;
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LookAlong(camera, delta, up);
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}
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void CCamera::LookAlong(CVector3D camera, CVector3D orientation, CVector3D up)
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{
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orientation.Normalize();
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up.Normalize();
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CVector3D s = orientation.Cross(up);
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m_Orientation._11 = -s.X; m_Orientation._12 = up.X; m_Orientation._13 = orientation.X; m_Orientation._14 = camera.X;
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m_Orientation._21 = -s.Y; m_Orientation._22 = up.Y; m_Orientation._23 = orientation.Y; m_Orientation._24 = camera.Y;
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m_Orientation._31 = -s.Z; m_Orientation._32 = up.Z; m_Orientation._33 = orientation.Z; m_Orientation._34 = camera.Z;
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m_Orientation._41 = 0.0f; m_Orientation._42 = 0.0f; m_Orientation._43 = 0.0f; m_Orientation._44 = 1.0f;
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}
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///////////////////////////////////////////////////////////////////////////////////
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// Render the camera's frustum
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void CCamera::Render(int intermediates) const
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{
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CVector3D nearPoints[4];
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CVector3D farPoints[4];
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GetCameraPlanePoints(m_NearPlane, nearPoints);
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GetCameraPlanePoints(m_FarPlane, farPoints);
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for(int i = 0; i < 4; i++)
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{
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nearPoints[i] = m_Orientation.Transform(nearPoints[i]);
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farPoints[i] = m_Orientation.Transform(farPoints[i]);
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}
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// near plane
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glBegin(GL_POLYGON);
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glVertex3fv(&nearPoints[0].X);
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glVertex3fv(&nearPoints[1].X);
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glVertex3fv(&nearPoints[2].X);
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glVertex3fv(&nearPoints[3].X);
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glEnd();
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// far plane
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glBegin(GL_POLYGON);
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glVertex3fv(&farPoints[0].X);
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glVertex3fv(&farPoints[1].X);
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glVertex3fv(&farPoints[2].X);
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glVertex3fv(&farPoints[3].X);
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glEnd();
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// connection lines
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glBegin(GL_QUAD_STRIP);
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glVertex3fv(&nearPoints[0].X);
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glVertex3fv(&farPoints[0].X);
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glVertex3fv(&nearPoints[1].X);
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glVertex3fv(&farPoints[1].X);
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glVertex3fv(&nearPoints[2].X);
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glVertex3fv(&farPoints[2].X);
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glVertex3fv(&nearPoints[3].X);
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glVertex3fv(&farPoints[3].X);
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glVertex3fv(&nearPoints[0].X);
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glVertex3fv(&farPoints[0].X);
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glEnd();
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// intermediate planes
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CVector3D intermediatePoints[4];
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for(int i = 0; i < intermediates; ++i)
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{
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float t = (i+1.0)/(intermediates+1.0);
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for(int j = 0; j < 4; ++j)
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intermediatePoints[j] = nearPoints[j]*t + farPoints[j]*(1.0-t);
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glBegin(GL_POLYGON);
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glVertex3fv(&intermediatePoints[0].X);
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glVertex3fv(&intermediatePoints[1].X);
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glVertex3fv(&intermediatePoints[2].X);
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glVertex3fv(&intermediatePoints[3].X);
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glEnd();
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}
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}
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