1 /*!**************************************************************************** 2 3 @file PVRTShadowVol.h 4 @copyright Copyright (c) Imagination Technologies Limited. 5 @brief Declarations of functions relating to shadow volume generation. 6 7 ******************************************************************************/ 8 #ifndef _PVRTSHADOWVOL_H_ 9 #define _PVRTSHADOWVOL_H_ 10 11 #include "PVRTContext.h" 12 #include "PVRTVector.h" 13 14 /**************************************************************************** 15 ** Defines 16 ****************************************************************************/ 17 #define PVRTSHADOWVOLUME_VISIBLE 0x00000001 18 #define PVRTSHADOWVOLUME_NEED_CAP_FRONT 0x00000002 19 #define PVRTSHADOWVOLUME_NEED_CAP_BACK 0x00000004 20 #define PVRTSHADOWVOLUME_NEED_ZFAIL 0x00000008 21 22 /**************************************************************************** 23 ** Structures 24 ****************************************************************************/ 25 26 /*!*********************************************************************** 27 @brief Edge to form part of a shadow volume mesh. 28 *************************************************************************/ 29 struct PVRTShadowVolMEdge { 30 unsigned short wV0, wV1; /*!< Indices of the vertices of the edge */ 31 int nVis; /*!< Bit0 = Visible, Bit1 = Hidden, Bit2 = Reverse Winding */ 32 }; 33 34 /*!*********************************************************************** 35 @brief Triangle to form part of a shadow volume mesh. 36 *************************************************************************/ 37 struct PVRTShadowVolMTriangle { 38 unsigned short w[3]; /*!< Source indices of the triangle */ 39 unsigned int wE0, wE1, wE2; /*!< Indices of the edges of the triangle */ 40 PVRTVECTOR3 vNormal; /*!< Triangle normal */ 41 int nWinding; /*!< BitN = Correct winding for edge N */ 42 }; 43 44 /*!*********************************************************************** 45 @brief Shadow volume mesh. 46 *************************************************************************/ 47 struct PVRTShadowVolShadowMesh { 48 PVRTVECTOR3 *pV; /*!< Unique vertices in object space */ 49 PVRTShadowVolMEdge *pE; /*!< Unique edges in object space */ 50 PVRTShadowVolMTriangle *pT; /*!< Unique triangles in object space */ 51 unsigned int nV; /*!< Vertex count */ 52 unsigned int nE; /*!< Edge count */ 53 unsigned int nT; /*!< Triangle count */ 54 55 #ifdef BUILD_DX11 56 ID3D11Buffer *pivb; /*!< Two copies of the vertices */ 57 #endif 58 #if defined(BUILD_OGL) 59 unsigned int pivb; /*!< Two copies of the vertices */ 60 #endif 61 #if defined(BUILD_OGLES) || defined(BUILD_OGLES2) || defined(BUILD_OGLES3) 62 void *pivb; /*!< Two copies of the vertices */ 63 #endif 64 }; 65 66 /*!*********************************************************************** 67 @brief Renderable shadow-volume information. 68 *************************************************************************/ 69 struct PVRTShadowVolShadowVol { 70 #ifdef BUILD_DX11 71 ID3D11Buffer *piib; /*!< Two copies of the vertices */ 72 #endif 73 #if defined(BUILD_OGL) 74 unsigned int piib; 75 #endif 76 #if defined(BUILD_OGLES) || defined(BUILD_OGLES2) || defined(BUILD_OGLES3) 77 unsigned short *piib; /*!< Indices to render the volume */ 78 #endif 79 unsigned int nIdxCnt; /*!< Number of indices in piib */ 80 81 #ifdef _DEBUG 82 unsigned int nIdxCntMax; /*!< Number of indices which can fit in piib */ 83 #endif 84 }; 85 86 /**************************************************************************** 87 ** Declarations 88 ****************************************************************************/ 89 90 /*!*********************************************************************** 91 @fn PVRTShadowVolMeshCreateMesh 92 @param[in,out] psMesh The shadow volume mesh to populate 93 @param[in] pVertex A list of vertices 94 @param[in] nNumVertex The number of vertices 95 @param[in] pFaces A list of faces 96 @param[in] nNumFaces The number of faces 97 @brief Creates a mesh format suitable for generating shadow volumes 98 *************************************************************************/ 99 void PVRTShadowVolMeshCreateMesh( 100 PVRTShadowVolShadowMesh * const psMesh, 101 const float * const pVertex, 102 const unsigned int nNumVertex, 103 const unsigned short * const pFaces, 104 const unsigned int nNumFaces); 105 106 /*!*********************************************************************** 107 @fn PVRTShadowVolMeshInitMesh 108 @param[in] psMesh The shadow volume mesh 109 @param[in] pContext A struct for API specific data 110 @return True on success 111 @brief Init the mesh 112 *************************************************************************/ 113 bool PVRTShadowVolMeshInitMesh( 114 PVRTShadowVolShadowMesh * const psMesh, 115 const SPVRTContext * const pContext); 116 117 /*!*********************************************************************** 118 @fn PVRTShadowVolMeshInitVol 119 @param[in,out] psVol The shadow volume struct 120 @param[in] psMesh The shadow volume mesh 121 @param[in] pContext A struct for API specific data 122 @return True on success 123 @brief Init the renderable shadow volume information. 124 *************************************************************************/ 125 bool PVRTShadowVolMeshInitVol( 126 PVRTShadowVolShadowVol * const psVol, 127 const PVRTShadowVolShadowMesh * const psMesh, 128 const SPVRTContext * const pContext); 129 130 /*!*********************************************************************** 131 @fn PVRTShadowVolMeshDestroyMesh 132 @param[in] psMesh The shadow volume mesh to destroy 133 @brief Destroys all shadow volume mesh data created by PVRTShadowVolMeshCreateMesh 134 *************************************************************************/ 135 void PVRTShadowVolMeshDestroyMesh( 136 PVRTShadowVolShadowMesh * const psMesh); 137 138 /*!*********************************************************************** 139 @fn PVRTShadowVolMeshReleaseMesh 140 @param[in] psMesh The shadow volume mesh to release 141 @brief Releases all shadow volume mesh data created by PVRTShadowVolMeshInitMesh 142 *************************************************************************/ 143 void PVRTShadowVolMeshReleaseMesh( 144 PVRTShadowVolShadowMesh * const psMesh, 145 SPVRTContext * const psContext=NULL); 146 147 /*!*********************************************************************** 148 @fn PVRTShadowVolMeshReleaseVol 149 @param[in] psVol The shadow volume information to release 150 @brief Releases all data create by PVRTShadowVolMeshInitVol 151 *************************************************************************/ 152 void PVRTShadowVolMeshReleaseVol( 153 PVRTShadowVolShadowVol * const psVol, 154 SPVRTContext * const psContext=NULL); 155 156 /*!*********************************************************************** 157 @fn PVRTShadowVolSilhouetteProjectedBuild 158 @param[in,out] psVol The shadow volume information 159 @param[in] dwVisFlags Shadow volume creation flags 160 @param[in] psMesh The shadow volume mesh 161 @param[in] pvLightModel The light position/direction 162 @param[in] bPointLight Is the light a point light 163 @param[in] pContext A struct for passing in API specific data 164 @brief Using the light set up the shadow volume so it can be extruded. 165 *************************************************************************/ 166 void PVRTShadowVolSilhouetteProjectedBuild( 167 PVRTShadowVolShadowVol * const psVol, 168 const unsigned int dwVisFlags, 169 const PVRTShadowVolShadowMesh * const psMesh, 170 const PVRTVECTOR3 * const pvLightModel, 171 const bool bPointLight, 172 const SPVRTContext * const pContext = 0); 173 174 /*!*********************************************************************** 175 @fn PVRTShadowVolSilhouetteProjectedBuild 176 @param[in,out] psVol The shadow volume information 177 @param[in] dwVisFlags Shadow volume creation flags 178 @param[in] psMesh The shadow volume mesh 179 @param[in] pvLightModel The light position/direction 180 @param[in] bPointLight Is the light a point light 181 @param[in] pContext A struct for passing in API specific data 182 @brief Using the light set up the shadow volume so it can be extruded. 183 *************************************************************************/ 184 void PVRTShadowVolSilhouetteProjectedBuild( 185 PVRTShadowVolShadowVol * const psVol, 186 const unsigned int dwVisFlags, 187 const PVRTShadowVolShadowMesh * const psMesh, 188 const PVRTVec3 * const pvLightModel, 189 const bool bPointLight, 190 const SPVRTContext * const pContext = 0); 191 192 /*!*********************************************************************** 193 @fn PVRTShadowVolBoundingBoxExtrude 194 @param[in,out] pvExtrudedCube 8 Vertices to represent the extruded box 195 @param[in] pBoundingBox The bounding box to extrude 196 @param[in] pvLightMdl The light position/direction 197 @param[in] bPointLight Is the light a point light 198 @param[in] fVolLength The length the volume has been extruded by 199 @brief Extrudes the bounding box of the volume 200 *************************************************************************/ 201 void PVRTShadowVolBoundingBoxExtrude( 202 PVRTVECTOR3 * const pvExtrudedCube, 203 const PVRTBOUNDINGBOX * const pBoundingBox, 204 const PVRTVECTOR3 * const pvLightMdl, 205 const bool bPointLight, 206 const float fVolLength); 207 208 /*!*********************************************************************** 209 @fn PVRTShadowVolBoundingBoxIsVisible 210 @param[in,out] pdwVisFlags Visibility flags 211 @param[in] bObVisible Is the object visible? Unused set to true 212 @param[in] bNeedsZClipping Does the object require Z clipping? Unused set to true 213 @param[in] pBoundingBox The volumes bounding box 214 @param[in] pmTrans The projection matrix 215 @param[in] pvLightMdl The light position/direction 216 @param[in] bPointLight Is the light a point light 217 @param[in] fCamZProj The camera's z projection value 218 @param[in] fVolLength The length the volume is extruded by 219 @brief Determines if the volume is visible and if it needs caps 220 *************************************************************************/ 221 void PVRTShadowVolBoundingBoxIsVisible( 222 unsigned int * const pdwVisFlags, 223 const bool bObVisible, 224 const bool bNeedsZClipping, 225 const PVRTBOUNDINGBOX * const pBoundingBox, 226 const PVRTMATRIX * const pmTrans, 227 const PVRTVECTOR3 * const pvLightMdl, 228 const bool bPointLight, 229 const float fCamZProj, 230 const float fVolLength); 231 232 /*!*********************************************************************** 233 @fn PVRTShadowVolSilhouetteProjectedRender 234 @param[in] psMesh Shadow volume mesh 235 @param[in] psVol Renderable shadow volume information 236 @param[in] pContext A struct for passing in API specific data 237 @brief Draws the shadow volume 238 *************************************************************************/ 239 int PVRTShadowVolSilhouetteProjectedRender( 240 const PVRTShadowVolShadowMesh * const psMesh, 241 const PVRTShadowVolShadowVol * const psVol, 242 const SPVRTContext * const pContext); 243 244 245 #endif /* _PVRTSHADOWVOL_H_ */ 246 247 /***************************************************************************** 248 End of file (PVRTShadowVol.h) 249 *****************************************************************************/ 250 251
