mirror of
https://port.numenaute.org/aleajactaest/khanat-opennel-code.git
synced 2024-11-28 10:06:33 +00:00
4e33e5cf2f
--HG-- branch : multipass-stereo
168 lines
7.6 KiB
C++
168 lines
7.6 KiB
C++
// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
|
|
// Copyright (C) 2010 Winch Gate Property Limited
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#ifndef CL_LANDSCAPE_POLY_DRAWER_H
|
|
#define CL_LANDSCAPE_POLY_DRAWER_H
|
|
|
|
// Misc
|
|
#include "nel/misc/aabbox.h"
|
|
#include "nel/misc/polygon.h"
|
|
#include "nel/misc/singleton.h"
|
|
|
|
// 3D
|
|
#include "nel/3d/index_buffer.h"
|
|
#include "nel/3d/vertex_buffer.h"
|
|
|
|
|
|
//-----------------------------------------------------------------------------------------------------------
|
|
//---------------------------------------- CInitStencil -----------------------------------------------------
|
|
//-----------------------------------------------------------------------------------------------------------
|
|
// CInitStencil inherits from the abstract NEL class ILandscapePolyDrawingCallback, attribut of UScene.
|
|
// An instance of CInitStencil is initialized at the time of CLandscapePolyDrawer initialization
|
|
// and passed to current scene. Thus, when stencil operation must be modified in a NEL class,
|
|
// this instance is used with its callbacks without any NEL class knows CLandscapePolyDrawer class.
|
|
//-----------------------------------------------------------------------------------------------------------
|
|
class CInitStencil : public NL3D::ILandscapePolyDrawingCallback
|
|
{
|
|
|
|
public:
|
|
|
|
// This instance is passed to current scene as its ILandscapePolyDrawingCallback instance.
|
|
// (UScene::setLandscapePolyDrawingCallback is called)
|
|
void init();
|
|
|
|
private:
|
|
// from NL3D::ILandscapePolyDrawingCallback
|
|
// This method is called before landscape render to modify stencil operation.
|
|
// The eighth bit will be written with a 1 during next render. Thus we will differentiate stencil buffer parts
|
|
// which will support Shadow Volume algorithm (landscape) and the other parts (veget...)
|
|
virtual void beginPolyDrawing();
|
|
|
|
// from NL3D::ILandscapePolyDrawingCallback
|
|
// This method is called after landscape render and before veget render to modify back stencil operation.
|
|
// The eighth bit will be again written with a 0 during next render.
|
|
virtual void endPolyDrawing();
|
|
};
|
|
|
|
|
|
//-----------------------------------------------------------------------------------------------------------
|
|
//---------------------------------- CLandscapePolyDrawer ---------------------------------------------------
|
|
//-----------------------------------------------------------------------------------------------------------
|
|
// CLandscapePolyDrawer class manages display of a polygonal zones group, thanks to a Robust Shadow Volume algorithm.
|
|
// To avoid intersection between a shadow volume and the frustum, the "Far" plane of this one is pushed back
|
|
// to infinity during shadow volume display.
|
|
// To a best robustness and to join depth range [depthMin, depthMax] used in display of main scene, an epsilon
|
|
// factor is calculated to transpose Z buffer values from [depthMin, 1] to [depthMin, depthMax]
|
|
// while in [depthMin, 1] depth range is used during shadow volume display.
|
|
//-----------------------------------------------------------------------------------------------------------
|
|
class CLandscapePolyDrawer : public NLMISC::CSingleton<CLandscapePolyDrawer>
|
|
{
|
|
|
|
public:
|
|
|
|
// Constructor
|
|
CLandscapePolyDrawer();
|
|
|
|
// Destructor
|
|
~CLandscapePolyDrawer();
|
|
|
|
// At every frame, polygons list is intialized and filled with addPloy calls.
|
|
void addPoly(const NLMISC::CPolygon2D &poly, const NLMISC::CRGBA & color, const NLMISC::CAABBox & bBox);
|
|
|
|
// At every frame end, polygons list is released. This allows an easy management to dynamic destructions,
|
|
// addition or modifications of polygons.
|
|
void deletePolygons();
|
|
|
|
// Compute bbox of enclosed patch of a landscape from a delimiting 2D polygon.
|
|
static void computeBBoxFromPolygon(const NLMISC::CPolygon2D &poly2D, NLMISC::CAABBox &destBBox);
|
|
|
|
// Called to initialize ILandscapePolyDrawingCallback instance of current scene with _InitStencil attribut.
|
|
void initLandscapePolyDrawingCallback();
|
|
|
|
|
|
private:
|
|
|
|
// renderScene is called in main loop. It can called beginRenderLandscapePolyPart and renderLandscapePolyPart
|
|
// methods.
|
|
friend void beginRenderScene();
|
|
friend void drawRenderScene(bool wantTraversals, bool keepTraversals);
|
|
friend void endRenderScene(bool keepTraversals);
|
|
|
|
// Enable stencil test and initialize function and operation of stencil at the beginning of renderScene method,
|
|
// before opaque render of canopy and main scene parts.
|
|
// The eighth bit will be written with a 0 during next render to mark stencil buffer parts which will
|
|
// support Shadow Volume algorithm.
|
|
void beginRenderLandscapePolyPart();
|
|
|
|
// Render polygons after opaque render of canopy and main scene parts and before transparency parts render.
|
|
// ZFail algorithm is only applied to stencil buffer parts whose eighth bit is equal to 1
|
|
// (avoid to color vegetation)
|
|
void renderLandscapePolyPart();
|
|
|
|
// Build vertex and index buffer of the associated polygon when addPloy is called.
|
|
// Vertices coordinates aren't calculated immediately but in drawShadowVolume method,
|
|
// because they are calculated in camera location.
|
|
void buildShadowVolume(uint poly);
|
|
|
|
// Render shadow volume of a polygon (color and depth buffers updates are disable).
|
|
// This method is called twice durong the both passes of ZFail algorithm.
|
|
// Coordinates of shadow volume vertex buffer are calculated in first pass.
|
|
void drawShadowVolume(uint poly, bool firstPass);
|
|
|
|
// Render polygon by displaying a quad which covers all zone delimited by scissor test.
|
|
// This quad is applied only to stencil buffer parts whose 7 last bits aren't equal to 0,
|
|
// thus the polygon projection on lanscape is delimited.
|
|
void drawPolygon(uint poly);
|
|
|
|
// Setup an infinite frustum and a [0, 1] depth range in a way Z Buffer values coincide
|
|
// with those of main scene with the depth range of main scene.
|
|
void infiniteFrustum();
|
|
|
|
// Setup initial projection matrix and depth range
|
|
void finiteFrustum();
|
|
|
|
// Setup scissor delimitation for polygon
|
|
void setScissor(uint polyId);
|
|
|
|
|
|
// This callback allows to setup stencil operation before and after vegetables and shadow render,
|
|
// in order to separate them of landscape stencil buffer values.
|
|
CInitStencil * _InitStencil;
|
|
|
|
// Vectors of polygons and their respective barycenters, colors, bounding boxes,
|
|
// vertex and index buffers.
|
|
std::vector<NLMISC::CPolygon2D> _Polygons;
|
|
std::vector<NLMISC::CVector2f> _Barycenters;
|
|
std::vector<NLMISC::CRGBA> _PolyColor;
|
|
std::vector<NLMISC::CAABBox> _BBoxes;
|
|
|
|
std::vector<NL3D::CVertexBuffer> _PolyVB;
|
|
std::vector<NL3D::CIndexBuffer> _PolyIB;
|
|
|
|
// Quad used to display polygons on marked parts of stencil buffer.
|
|
NLMISC::CQuad _Shadow;
|
|
|
|
// Initial frustum used before shadow volumes display and stored to reset old values at the end of this display.
|
|
NL3D::CFrustum _FiniteFrustum;
|
|
|
|
// Max depth range used before shadow volumes display and stored to reset old values back at the end of this display.
|
|
float _MaxDepthRange;
|
|
|
|
// View matrix used before shadow volumes display and stored to reset old values at the end of this display.
|
|
NLMISC::CMatrix _OldViewMatrix;
|
|
};
|
|
|
|
#endif
|