[1] | 1 | /* |
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| 2 | ----------------------------------------------------------------------------- |
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| 3 | This source file is part of OGRE |
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| 4 | (Object-oriented Graphics Rendering Engine) |
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| 5 | For the latest info, see http://www.ogre3d.org/ |
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| 6 | |
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| 7 | Copyright (c) 2000-2006 Torus Knot Software Ltd |
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| 8 | Also see acknowledgements in Readme.html |
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| 9 | |
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| 10 | This program is free software; you can redistribute it and/or modify it under |
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| 11 | the terms of the GNU Lesser General Public License as published by the Free Software |
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| 12 | Foundation; either version 2 of the License, or (at your option) any later |
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| 13 | version. |
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| 14 | |
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| 15 | This program is distributed in the hope that it will be useful, but WITHOUT |
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| 16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
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| 18 | |
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| 19 | You should have received a copy of the GNU Lesser General Public License along with |
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| 20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
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| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to |
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| 22 | http://www.gnu.org/copyleft/lesser.txt. |
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| 23 | |
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| 24 | You may alternatively use this source under the terms of a specific version of |
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| 25 | the OGRE Unrestricted License provided you have obtained such a license from |
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| 26 | Torus Knot Software Ltd. |
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| 27 | ----------------------------------------------------------------------------- |
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| 28 | */ |
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| 29 | |
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| 30 | #ifndef __SHADOWVOLUMEEXTRUDEPROGRAM_H__ |
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| 31 | #define __SHADOWVOLUMEEXTRUDEPROGRAM_H__ |
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| 32 | |
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| 33 | #include "OgrePrerequisites.h" |
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| 34 | #include "OgreLight.h" |
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| 35 | |
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| 36 | namespace Ogre { |
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| 37 | /** Static class containing source for vertex programs for extruding shadow volumes |
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| 38 | @remarks |
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| 39 | This exists so we don't have to be dependent on an external media files. |
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| 40 | Assembler is used so we don't have to rely on particular plugins. |
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| 41 | The assembler contents of this file were generated from the following Cg: |
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| 42 | @code |
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| 43 | // Point light shadow volume extrude |
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| 44 | void shadowVolumeExtrudePointLight_vp ( |
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| 45 | float4 position : POSITION, |
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| 46 | float wcoord : TEXCOORD0, |
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| 47 | |
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| 48 | out float4 oPosition : POSITION, |
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| 49 | |
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| 50 | uniform float4x4 worldViewProjMatrix, |
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| 51 | uniform float4 lightPos // homogenous, object space |
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| 52 | ) |
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| 53 | { |
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| 54 | // extrusion in object space |
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| 55 | // vertex unmodified if w==1, extruded if w==0 |
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| 56 | float4 newpos = |
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| 57 | (wcoord.xxxx * lightPos) + |
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| 58 | float4(position.xyz - lightPos.xyz, 0); |
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| 59 | |
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| 60 | oPosition = mul(worldViewProjMatrix, newpos); |
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| 61 | |
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| 62 | } |
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| 63 | |
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| 64 | // Directional light extrude |
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| 65 | void shadowVolumeExtrudeDirLight_vp ( |
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| 66 | float4 position : POSITION, |
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| 67 | float wcoord : TEXCOORD0, |
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| 68 | |
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| 69 | out float4 oPosition : POSITION, |
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| 70 | |
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| 71 | uniform float4x4 worldViewProjMatrix, |
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| 72 | uniform float4 lightPos // homogenous, object space |
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| 73 | ) |
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| 74 | { |
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| 75 | // extrusion in object space |
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| 76 | // vertex unmodified if w==1, extruded if w==0 |
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| 77 | float4 newpos = |
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| 78 | (wcoord.xxxx * (position + lightPos)) - lightPos; |
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| 79 | |
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| 80 | oPosition = mul(worldViewProjMatrix, newpos); |
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| 81 | |
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| 82 | } |
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| 83 | // Point light shadow volume extrude - FINITE |
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| 84 | void shadowVolumeExtrudePointLightFinite_vp ( |
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| 85 | float4 position : POSITION, |
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| 86 | float wcoord : TEXCOORD0, |
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| 87 | |
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| 88 | out float4 oPosition : POSITION, |
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| 89 | |
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| 90 | uniform float4x4 worldViewProjMatrix, |
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| 91 | uniform float4 lightPos, // homogenous, object space |
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| 92 | uniform float extrusionDistance // how far to extrude |
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| 93 | ) |
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| 94 | { |
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| 95 | // extrusion in object space |
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| 96 | // vertex unmodified if w==1, extruded if w==0 |
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| 97 | float3 extrusionDir = position.xyz - lightPos.xyz; |
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| 98 | extrusionDir = normalize(extrusionDir); |
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| 99 | |
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| 100 | float4 newpos = float4(position.xyz + |
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| 101 | ((1 - wcoord.x) * extrusionDistance * extrusionDir), 1); |
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| 102 | |
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| 103 | oPosition = mul(worldViewProjMatrix, newpos); |
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| 104 | |
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| 105 | } |
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| 106 | |
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| 107 | // Directional light extrude - FINITE |
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| 108 | void shadowVolumeExtrudeDirLightFinite_vp ( |
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| 109 | float4 position : POSITION, |
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| 110 | float wcoord : TEXCOORD0, |
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| 111 | |
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| 112 | out float4 oPosition : POSITION, |
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| 113 | |
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| 114 | uniform float4x4 worldViewProjMatrix, |
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| 115 | uniform float4 lightPos, // homogenous, object space |
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| 116 | uniform float extrusionDistance // how far to extrude |
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| 117 | ) |
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| 118 | { |
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| 119 | // extrusion in object space |
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| 120 | // vertex unmodified if w==1, extruded if w==0 |
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| 121 | // -ve lightPos is direction |
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| 122 | float4 newpos = float4(position.xyz - |
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| 123 | (wcoord.x * extrusionDistance * lightPos.xyz), 1); |
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| 124 | |
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| 125 | oPosition = mul(worldViewProjMatrix, newpos); |
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| 126 | |
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| 127 | } |
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| 128 | @endcode |
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| 129 | */ |
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| 130 | class _OgreExport ShadowVolumeExtrudeProgram |
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| 131 | { |
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| 132 | private: |
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| 133 | static String mPointArbvp1; |
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| 134 | static String mPointVs_1_1; |
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| 135 | static String mDirArbvp1; |
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| 136 | static String mDirVs_1_1; |
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| 137 | // same as above, except the color is set to 1 to enable debug volumes to be seen |
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| 138 | static String mPointArbvp1Debug; |
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| 139 | static String mPointVs_1_1Debug; |
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| 140 | static String mDirArbvp1Debug; |
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| 141 | static String mDirVs_1_1Debug; |
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| 142 | |
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| 143 | static String mPointArbvp1Finite; |
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| 144 | static String mPointVs_1_1Finite; |
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| 145 | static String mDirArbvp1Finite; |
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| 146 | static String mDirVs_1_1Finite; |
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| 147 | // same as above, except the color is set to 1 to enable debug volumes to be seen |
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| 148 | static String mPointArbvp1FiniteDebug; |
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| 149 | static String mPointVs_1_1FiniteDebug; |
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| 150 | static String mDirArbvp1FiniteDebug; |
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| 151 | static String mDirVs_1_1FiniteDebug; |
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| 152 | |
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| 153 | static bool mInitialised; |
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| 154 | |
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| 155 | public: |
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| 156 | #define OGRE_NUM_SHADOW_EXTRUDER_PROGRAMS 8 |
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| 157 | enum Programs |
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| 158 | { |
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| 159 | // Point light extruder, infinite distance |
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| 160 | POINT_LIGHT = 0, |
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| 161 | // Point light extruder, infinite distance, debug mode |
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| 162 | POINT_LIGHT_DEBUG = 1, |
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| 163 | // Directional light extruder, infinite distance |
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| 164 | DIRECTIONAL_LIGHT = 2, |
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| 165 | // Directional light extruder, infinite distance, debug mode |
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| 166 | DIRECTIONAL_LIGHT_DEBUG = 3, |
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| 167 | // Point light extruder, finite distance |
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| 168 | POINT_LIGHT_FINITE = 4, |
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| 169 | // Point light extruder, finite distance, debug mode |
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| 170 | POINT_LIGHT_FINITE_DEBUG = 5, |
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| 171 | // Directional light extruder, finite distance |
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| 172 | DIRECTIONAL_LIGHT_FINITE = 6, |
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| 173 | // Directional light extruder, finite distance, debug mode |
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| 174 | DIRECTIONAL_LIGHT_FINITE_DEBUG = 7 |
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| 175 | |
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| 176 | }; |
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| 177 | static const String programNames[OGRE_NUM_SHADOW_EXTRUDER_PROGRAMS]; |
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| 178 | |
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| 179 | /// Initialise the creation of these vertex programs |
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| 180 | static void initialise(void); |
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| 181 | /// Shutdown & destroy the vertex programs |
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| 182 | static void shutdown(void); |
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| 183 | /// Get extruder program source for point lights, compatible with arbvp1 |
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| 184 | static const String& getPointLightExtruderArbvp1(void) { return mPointArbvp1; } |
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| 185 | /// Get extruder program source for point lights, compatible with vs_1_1 |
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| 186 | static const String& getPointLightExtruderVs_1_1(void) { return mPointVs_1_1; } |
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| 187 | /// Get extruder program source for directional lights, compatible with arbvp1 |
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| 188 | static const String& getDirectionalLightExtruderArbvp1(void) { return mDirArbvp1; } |
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| 189 | /// Get extruder program source for directional lights, compatible with vs_1_1 |
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| 190 | static const String& getDirectionalLightExtruderVs_1_1(void) { return mDirVs_1_1; } |
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| 191 | |
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| 192 | /// Get extruder program source for debug point lights, compatible with arbvp1 |
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| 193 | static const String& getPointLightExtruderArbvp1Debug(void) { return mPointArbvp1Debug; } |
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| 194 | /// Get extruder program source for debug point lights, compatible with vs_1_1 |
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| 195 | static const String& getPointLightExtruderVs_1_1Debug(void) { return mPointVs_1_1Debug; } |
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| 196 | /// Get extruder program source for debug directional lights, compatible with arbvp1 |
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| 197 | static const String& getDirectionalLightExtruderArbvp1Debug(void) { return mDirArbvp1Debug; } |
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| 198 | /// Get extruder program source for debug directional lights, compatible with vs_1_1 |
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| 199 | static const String& getDirectionalLightExtruderVs_1_1Debug(void) { return mDirVs_1_1Debug; } |
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| 200 | /// General purpose method to get any of the program sources |
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| 201 | static const String& getProgramSource(Light::LightTypes lightType, const String syntax, |
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| 202 | bool finite, bool debug); |
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| 203 | |
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| 204 | static const String& getProgramName(Light::LightTypes lightType, bool finite, bool debug); |
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| 205 | |
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| 206 | |
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| 207 | |
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| 208 | |
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| 209 | |
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| 210 | /// Get FINITE extruder program source for point lights, compatible with arbvp1 |
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| 211 | static const String& getPointLightExtruderArbvp1Finite(void) { return mPointArbvp1Finite; } |
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| 212 | /// Get FINITE extruder program source for point lights, compatible with vs_1_1 |
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| 213 | static const String& getPointLightExtruderVs_1_1Finite(void) { return mPointVs_1_1Finite; } |
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| 214 | /// Get FINITE extruder program source for directional lights, compatible with arbvp1 |
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| 215 | static const String& getDirectionalLightExtruderArbvp1Finite(void) { return mDirArbvp1Finite; } |
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| 216 | /// Get FINITE extruder program source for directional lights, compatible with vs_1_1 |
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| 217 | static const String& getDirectionalLightExtruderVs_1_1Finite(void) { return mDirVs_1_1Finite; } |
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| 218 | |
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| 219 | /// Get FINITE extruder program source for debug point lights, compatible with arbvp1 |
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| 220 | static const String& getPointLightExtruderArbvp1FiniteDebug(void) { return mPointArbvp1FiniteDebug; } |
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| 221 | /// Get extruder program source for debug point lights, compatible with vs_1_1 |
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| 222 | static const String& getPointLightExtruderVs_1_1FiniteDebug(void) { return mPointVs_1_1FiniteDebug; } |
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| 223 | /// Get FINITE extruder program source for debug directional lights, compatible with arbvp1 |
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| 224 | static const String& getDirectionalLightExtruderArbvp1FiniteDebug(void) { return mDirArbvp1FiniteDebug; } |
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| 225 | /// Get FINITE extruder program source for debug directional lights, compatible with vs_1_1 |
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| 226 | static const String& getDirectionalLightExtruderVs_1_1FiniteDebug(void) { return mDirVs_1_1FiniteDebug; } |
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| 227 | |
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| 228 | |
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| 229 | |
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| 230 | |
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| 231 | }; |
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| 232 | } |
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| 233 | #endif |
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