1 /*
2 -----------------------------------------------------------------------------
3 This source file is part of OGRE
4 (Object-oriented Graphics Rendering Engine)
5 For the latest info, see http://www.ogre3d.org
6 
7 Copyright (c) 2000-2014 Torus Knot Software Ltd
8 Permission is hereby granted, free of charge, to any person obtaining a copy
9 of this software and associated documentation files (the "Software"), to deal
10 in the Software without restriction, including without limitation the rights
11 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 copies of the Software, and to permit persons to whom the Software is
13 furnished to do so, subject to the following conditions:
14 
15 The above copyright notice and this permission notice shall be included in
16 all copies or substantial portions of the Software.
17 
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 THE SOFTWARE.
25 -----------------------------------------------------------------------------
26 */
27 #ifndef _ShaderExPerPixelLighting_
28 #define _ShaderExPerPixelLighting_
29 
30 #include "OgreShaderPrerequisites.h"
31 #ifdef RTSHADER_SYSTEM_BUILD_EXT_SHADERS
32 #include "OgreShaderFFPLighting.h"
33 #include "OgreLight.h"
34 #include "OgreCommon.h"
35 
36 namespace Ogre {
37 namespace RTShader {
38 
39 /** \addtogroup Optional
40 *  @{
41 */
42 /** \addtogroup RTShader
43 *  @{
44 */
45 
46 #define SGX_LIB_PERPIXELLIGHTING                    "SGXLib_PerPixelLighting"
47 #define SGX_FUNC_TRANSFORMNORMAL                    "SGX_TransformNormal"
48 #define SGX_FUNC_TRANSFORMPOSITION                  "SGX_TransformPosition"
49 #define SGX_FUNC_LIGHT_DIRECTIONAL_DIFFUSE          "SGX_Light_Directional_Diffuse"
50 #define SGX_FUNC_LIGHT_DIRECTIONAL_DIFFUSESPECULAR  "SGX_Light_Directional_DiffuseSpecular"
51 #define SGX_FUNC_LIGHT_POINT_DIFFUSE                "SGX_Light_Point_Diffuse"
52 #define SGX_FUNC_LIGHT_POINT_DIFFUSESPECULAR        "SGX_Light_Point_DiffuseSpecular"
53 #define SGX_FUNC_LIGHT_SPOT_DIFFUSE                 "SGX_Light_Spot_Diffuse"
54 #define SGX_FUNC_LIGHT_SPOT_DIFFUSESPECULAR         "SGX_Light_Spot_DiffuseSpecular"
55 
56 /** Per pixel Lighting extension sub render state implementation.
57 Derives from SubRenderState class.
58 */
59 class _OgreRTSSExport PerPixelLighting : public FFPLighting
60 {
61 
62 // Interface.
63 public:
64     /**
65     @see SubRenderState::getType.
66     */
67     virtual const String& getType() const;
68 
69     static String Type;
70 
71 // Protected methods
72 protected:
73     /**
74     @see SubRenderState::resolveParameters.
75     */
76     virtual bool resolveParameters(ProgramSet* programSet);
77 
78     /** Resolve global lighting parameters */
79     virtual bool resolveGlobalParameters(ProgramSet* programSet);
80 
81     /** Resolve per light parameters */
82     virtual bool resolvePerLightParameters(ProgramSet* programSet);
83 
84     /**
85     @see SubRenderState::resolveDependencies.
86     */
87     virtual bool resolveDependencies(ProgramSet* programSet);
88 
89     /**
90     @see SubRenderState::addFunctionInvocations.
91     */
92     virtual bool addFunctionInvocations(ProgramSet* programSet);
93 
94 
95     /**
96     Internal method that adds related vertex shader functions invocations.
97     */
98     bool addVSInvocation(Function* vsMain, const int groupOrder);
99 
100 
101     /**
102     Internal method that adds global illumination component functions invocations.
103     */
104     bool addPSGlobalIlluminationInvocation(Function* psMain, const int groupOrder);
105 
106     /**
107     Internal method that adds the final colour assignments.
108     */
109     bool addPSFinalAssignmentInvocation(Function* psMain, const int groupOrder);
110 
111 
112 // Attributes.
113 protected:
114     // Vertex shader output view position (position in camera space) parameter.
115     ParameterPtr mVSOutViewPos;
116     // Vertex shader output normal.
117     ParameterPtr mVSOutNormal;
118     // Pixel shader input/local specular parameter.
119     ParameterPtr mPSSpecular;
120 };
121 
122 
123 /**
124 A factory that enables creation of PerPixelLighting instances.
125 @remarks Sub class of SubRenderStateFactory
126 */
127 class _OgreRTSSExport PerPixelLightingFactory : public SubRenderStateFactory
128 {
129 public:
130 
131     /**
132     @see SubRenderStateFactory::getType.
133     */
134     virtual const String& getType() const;
135 
136     /**
137     @see SubRenderStateFactory::createInstance.
138     */
139     virtual SubRenderState* createInstance(ScriptCompiler* compiler, PropertyAbstractNode* prop, Pass* pass, SGScriptTranslator* translator);
140 
141     /**
142     @see SubRenderStateFactory::writeInstance.
143     */
144     virtual void writeInstance(MaterialSerializer* ser, SubRenderState* subRenderState, Pass* srcPass, Pass* dstPass);
145 
146 
147 protected:
148 
149     /**
150     @see SubRenderStateFactory::createInstanceImpl.
151     */
152     virtual SubRenderState* createInstanceImpl();
153 
154 
155 };
156 
157 /** @} */
158 /** @} */
159 
160 }
161 }
162 
163 #endif
164 #endif
165 
166