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/*!****************************************************************************
@file PVRTShadowVol.h
@copyright Copyright (c) Imagination Technologies Limited.
@brief Declarations of functions relating to shadow volume generation.
******************************************************************************/
#ifndef _PVRTSHADOWVOL_H_
#define _PVRTSHADOWVOL_H_
#include "PVRTContext.h"
#include "PVRTVector.h"
/****************************************************************************
** Defines
****************************************************************************/
#define PVRTSHADOWVOLUME_VISIBLE 0x00000001
#define PVRTSHADOWVOLUME_NEED_CAP_FRONT 0x00000002
#define PVRTSHADOWVOLUME_NEED_CAP_BACK 0x00000004
#define PVRTSHADOWVOLUME_NEED_ZFAIL 0x00000008
/****************************************************************************
** Structures
****************************************************************************/
/*!***********************************************************************
@brief Edge to form part of a shadow volume mesh.
*************************************************************************/
struct PVRTShadowVolMEdge {
unsigned short wV0, wV1; /*!< Indices of the vertices of the edge */
int nVis; /*!< Bit0 = Visible, Bit1 = Hidden, Bit2 = Reverse Winding */
};
/*!***********************************************************************
@brief Triangle to form part of a shadow volume mesh.
*************************************************************************/
struct PVRTShadowVolMTriangle {
unsigned short w[3]; /*!< Source indices of the triangle */
unsigned int wE0, wE1, wE2; /*!< Indices of the edges of the triangle */
PVRTVECTOR3 vNormal; /*!< Triangle normal */
int nWinding; /*!< BitN = Correct winding for edge N */
};
/*!***********************************************************************
@brief Shadow volume mesh.
*************************************************************************/
struct PVRTShadowVolShadowMesh {
PVRTVECTOR3 *pV; /*!< Unique vertices in object space */
PVRTShadowVolMEdge *pE; /*!< Unique edges in object space */
PVRTShadowVolMTriangle *pT; /*!< Unique triangles in object space */
unsigned int nV; /*!< Vertex count */
unsigned int nE; /*!< Edge count */
unsigned int nT; /*!< Triangle count */
#ifdef BUILD_DX11
ID3D11Buffer *pivb; /*!< Two copies of the vertices */
#endif
#if defined(BUILD_OGL)
unsigned int pivb; /*!< Two copies of the vertices */
#endif
#if defined(BUILD_OGLES) || defined(BUILD_OGLES2) || defined(BUILD_OGLES3)
void *pivb; /*!< Two copies of the vertices */
#endif
};
/*!***********************************************************************
@brief Renderable shadow-volume information.
*************************************************************************/
struct PVRTShadowVolShadowVol {
#ifdef BUILD_DX11
ID3D11Buffer *piib; /*!< Two copies of the vertices */
#endif
#if defined(BUILD_OGL)
unsigned int piib;
#endif
#if defined(BUILD_OGLES) || defined(BUILD_OGLES2) || defined(BUILD_OGLES3)
unsigned short *piib; /*!< Indices to render the volume */
#endif
unsigned int nIdxCnt; /*!< Number of indices in piib */
#ifdef _DEBUG
unsigned int nIdxCntMax; /*!< Number of indices which can fit in piib */
#endif
};
/****************************************************************************
** Declarations
****************************************************************************/
/*!***********************************************************************
@fn PVRTShadowVolMeshCreateMesh
@param[in,out] psMesh The shadow volume mesh to populate
@param[in] pVertex A list of vertices
@param[in] nNumVertex The number of vertices
@param[in] pFaces A list of faces
@param[in] nNumFaces The number of faces
@brief Creates a mesh format suitable for generating shadow volumes
*************************************************************************/
void PVRTShadowVolMeshCreateMesh(
PVRTShadowVolShadowMesh * const psMesh,
const float * const pVertex,
const unsigned int nNumVertex,
const unsigned short * const pFaces,
const unsigned int nNumFaces);
/*!***********************************************************************
@fn PVRTShadowVolMeshInitMesh
@param[in] psMesh The shadow volume mesh
@param[in] pContext A struct for API specific data
@return True on success
@brief Init the mesh
*************************************************************************/
bool PVRTShadowVolMeshInitMesh(
PVRTShadowVolShadowMesh * const psMesh,
const SPVRTContext * const pContext);
/*!***********************************************************************
@fn PVRTShadowVolMeshInitVol
@param[in,out] psVol The shadow volume struct
@param[in] psMesh The shadow volume mesh
@param[in] pContext A struct for API specific data
@return True on success
@brief Init the renderable shadow volume information.
*************************************************************************/
bool PVRTShadowVolMeshInitVol(
PVRTShadowVolShadowVol * const psVol,
const PVRTShadowVolShadowMesh * const psMesh,
const SPVRTContext * const pContext);
/*!***********************************************************************
@fn PVRTShadowVolMeshDestroyMesh
@param[in] psMesh The shadow volume mesh to destroy
@brief Destroys all shadow volume mesh data created by PVRTShadowVolMeshCreateMesh
*************************************************************************/
void PVRTShadowVolMeshDestroyMesh(
PVRTShadowVolShadowMesh * const psMesh);
/*!***********************************************************************
@fn PVRTShadowVolMeshReleaseMesh
@param[in] psMesh The shadow volume mesh to release
@brief Releases all shadow volume mesh data created by PVRTShadowVolMeshInitMesh
*************************************************************************/
void PVRTShadowVolMeshReleaseMesh(
PVRTShadowVolShadowMesh * const psMesh,
SPVRTContext * const psContext=NULL);
/*!***********************************************************************
@fn PVRTShadowVolMeshReleaseVol
@param[in] psVol The shadow volume information to release
@brief Releases all data create by PVRTShadowVolMeshInitVol
*************************************************************************/
void PVRTShadowVolMeshReleaseVol(
PVRTShadowVolShadowVol * const psVol,
SPVRTContext * const psContext=NULL);
/*!***********************************************************************
@fn PVRTShadowVolSilhouetteProjectedBuild
@param[in,out] psVol The shadow volume information
@param[in] dwVisFlags Shadow volume creation flags
@param[in] psMesh The shadow volume mesh
@param[in] pvLightModel The light position/direction
@param[in] bPointLight Is the light a point light
@param[in] pContext A struct for passing in API specific data
@brief Using the light set up the shadow volume so it can be extruded.
*************************************************************************/
void PVRTShadowVolSilhouetteProjectedBuild(
PVRTShadowVolShadowVol * const psVol,
const unsigned int dwVisFlags,
const PVRTShadowVolShadowMesh * const psMesh,
const PVRTVECTOR3 * const pvLightModel,
const bool bPointLight,
const SPVRTContext * const pContext = 0);
/*!***********************************************************************
@fn PVRTShadowVolSilhouetteProjectedBuild
@param[in,out] psVol The shadow volume information
@param[in] dwVisFlags Shadow volume creation flags
@param[in] psMesh The shadow volume mesh
@param[in] pvLightModel The light position/direction
@param[in] bPointLight Is the light a point light
@param[in] pContext A struct for passing in API specific data
@brief Using the light set up the shadow volume so it can be extruded.
*************************************************************************/
void PVRTShadowVolSilhouetteProjectedBuild(
PVRTShadowVolShadowVol * const psVol,
const unsigned int dwVisFlags,
const PVRTShadowVolShadowMesh * const psMesh,
const PVRTVec3 * const pvLightModel,
const bool bPointLight,
const SPVRTContext * const pContext = 0);
/*!***********************************************************************
@fn PVRTShadowVolBoundingBoxExtrude
@param[in,out] pvExtrudedCube 8 Vertices to represent the extruded box
@param[in] pBoundingBox The bounding box to extrude
@param[in] pvLightMdl The light position/direction
@param[in] bPointLight Is the light a point light
@param[in] fVolLength The length the volume has been extruded by
@brief Extrudes the bounding box of the volume
*************************************************************************/
void PVRTShadowVolBoundingBoxExtrude(
PVRTVECTOR3 * const pvExtrudedCube,
const PVRTBOUNDINGBOX * const pBoundingBox,
const PVRTVECTOR3 * const pvLightMdl,
const bool bPointLight,
const float fVolLength);
/*!***********************************************************************
@fn PVRTShadowVolBoundingBoxIsVisible
@param[in,out] pdwVisFlags Visibility flags
@param[in] bObVisible Is the object visible? Unused set to true
@param[in] bNeedsZClipping Does the object require Z clipping? Unused set to true
@param[in] pBoundingBox The volumes bounding box
@param[in] pmTrans The projection matrix
@param[in] pvLightMdl The light position/direction
@param[in] bPointLight Is the light a point light
@param[in] fCamZProj The camera's z projection value
@param[in] fVolLength The length the volume is extruded by
@brief Determines if the volume is visible and if it needs caps
*************************************************************************/
void PVRTShadowVolBoundingBoxIsVisible(
unsigned int * const pdwVisFlags,
const bool bObVisible,
const bool bNeedsZClipping,
const PVRTBOUNDINGBOX * const pBoundingBox,
const PVRTMATRIX * const pmTrans,
const PVRTVECTOR3 * const pvLightMdl,
const bool bPointLight,
const float fCamZProj,
const float fVolLength);
/*!***********************************************************************
@fn PVRTShadowVolSilhouetteProjectedRender
@param[in] psMesh Shadow volume mesh
@param[in] psVol Renderable shadow volume information
@param[in] pContext A struct for passing in API specific data
@brief Draws the shadow volume
*************************************************************************/
int PVRTShadowVolSilhouetteProjectedRender(
const PVRTShadowVolShadowMesh * const psMesh,
const PVRTShadowVolShadowVol * const psVol,
const SPVRTContext * const pContext);
#endif /* _PVRTSHADOWVOL_H_ */
/*****************************************************************************
End of file (PVRTShadowVol.h)
*****************************************************************************/