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source: downloads/OgreMain/include/OgreShadowVolumeExtrudeProgram.h @ 3

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