CShaderFong.h
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1 //==============================================================================
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38  \author <http://www.chai3d.org>
39  \author Sonny Chan
40  \version 3.2.0 $Rev: 2015 $
41  */
42 //==============================================================================
43 
44 //---------------------------------------------------------------------------
45 #ifndef CShaderFong
46 #define CShaderFong
47 //---------------------------------------------------------------------------
48 #include "system/CGlobals.h"
49 //---------------------------------------------------------------------------
50 
51 //---------------------------------------------------------------------------
52 namespace chai3d {
53 //---------------------------------------------------------------------------
54 
55 const std::string C_SHADER_FONG_VERT =
56 " \n"
57 " attribute vec3 aPosition; \n"
58 " attribute vec3 aNormal; \n"
59 " attribute vec3 aTexCoord; \n"
60 " attribute vec4 aColor; \n"
61 " attribute vec3 aTangent; \n"
62 " attribute vec3 aBitangent; \n"
63 " \n"
64 " // vertex position and normal in eye coordinate space \n"
65 " varying vec4 vPosition; \n"
66 " varying vec3 vNormal; \n"
67 " \n"
68 " //---------------------------------------------------------------------- \n"
69 " // Main vertex shader code. \n"
70 " //---------------------------------------------------------------------- \n"
71 " \n"
72 " void main(void) \n"
73 " { \n"
74 " // pass along a transformed vertex position, normal, and texture \n"
75 " vPosition = gl_ModelViewMatrix * gl_Vertex; \n"
76 " vNormal = gl_NormalMatrix * aNormal; \n"
77 " gl_TexCoord[0] = gl_TextureMatrix[0] * vec4(aTexCoord, 1.0); \n"
78 " \n"
79 " // transform the vertex to get shadow map texture coordinates \n"
80 " float s = dot(gl_EyePlaneS[1], vPosition); \n"
81 " float t = dot(gl_EyePlaneT[1], vPosition); \n"
82 " float r = dot(gl_EyePlaneR[1], vPosition); \n"
83 " float q = dot(gl_EyePlaneQ[1], vPosition); \n"
84 " gl_TexCoord[1] = vec4(s, t, r, q); \n"
85 " \n"
86 " // fixed function vertex transform \n"
87 " gl_Position = ftransform(); \n"
88 " } \n"
89 " \n";
90 
91 const std::string C_SHADER_FONG_FRAG =
92 " \n"
93 "// interpolated vertex position in eye coordinate space (from vertex shader) \n"
94 " varying vec4 vPosition; \n"
95 " varying vec3 vNormal; \n"
96 " \n"
97 " // shadow (depth) map \n"
98 " uniform sampler2DShadow uShadowMap; \n"
99 " \n"
100 " //---------------------------------------------------------------------- \n"
101 " // Computes lighting power and attenuation (Section 2.14.1 of specification) \n"
102 " //---------------------------------------------------------------------- \n"
103 " \n"
104 " float attenuation(vec3 p, int i) \n"
105 " { \n"
106 " vec4 p_l = gl_LightSource[i].position; \n"
107 " if (p_l.w == 0.0) return 1.0; \n"
108 " \n"
109 " float d = distance(p, p_l.xyz); \n"
110 " float k0 = gl_LightSource[i].constantAttenuation; \n"
111 " float k1 = gl_LightSource[i].linearAttenuation; \n"
112 " float k2 = gl_LightSource[i].quadraticAttenuation; \n"
113 " \n"
114 " return 1.0 / (k0 + k1*d + k2*d*d); \n"
115 " } \n"
116 " \n"
117 " float spotlight(vec3 p, int i) \n"
118 " { \n"
119 " if (gl_LightSource[i].spotCosCutoff < 0.0) return 1.0; \n"
120 " \n"
121 " vec4 p_l = gl_LightSource[i].position; \n"
122 " if (p_l.w == 0.0) return 1.0; \n"
123 " \n"
124 " vec3 v = normalize(p - p_l.xyz); \n"
125 " vec3 s = normalize(gl_LightSource[i].spotDirection); \n"
126 " \n"
127 " float cosine = max(dot(v, s), 0.0); \n"
128 " if (cosine >= gl_LightSource[i].spotCosCutoff) \n"
129 " return pow(cosine, gl_LightSource[i].spotExponent); \n"
130 " else return 0.0; \n"
131 " } \n"
132 " \n"
133 " \n"
134 " //---------------------------------------------------------------------- \n"
135 " // Computes phong shading based on current light and material properties. \n"
136 " //---------------------------------------------------------------------- \n"
137 " \n"
138 " vec4 shade(vec3 p, vec3 v, vec3 n) \n"
139 " { \n"
140 " vec3 Ie = gl_FrontMaterial.emission.rgb; \n"
141 " vec3 Ia = gl_FrontLightModelProduct.sceneColor.rgb; \n"
142 " vec3 Il = vec3(0.0); \n"
143 " \n"
144 " for (int i = 0; i < gl_MaxLights; ++i) \n"
145 " { \n"
146 " vec4 p_l = gl_LightSource[i].position; \n"
147 " vec3 l = normalize(p_l.xyz - p * p_l.w); \n"
148 " vec3 h = normalize(l + v); \n"
149 " float s_m = gl_FrontMaterial.shininess; \n"
150 " \n"
151 " float cosNL = max(dot(n, l), 0.0); \n"
152 " float cosNH = max(dot(n, h), 0.0); \n"
153 " \n"
154 " vec3 phong = gl_FrontLightProduct[i].ambient.rgb \n"
155 " + cosNL * gl_FrontLightProduct[i].diffuse.rgb \n"
156 " + pow(cosNH, s_m) * gl_FrontLightProduct[i].specular.rgb; \n"
157 " Il += attenuation(p, i) * spotlight(p, i) * phong; \n"
158 " } \n"
159 " \n"
160 " float alpha = gl_FrontMaterial.diffuse.a; \n"
161 " return vec4(Ie + Ia + Il, alpha); \n"
162 " } \n"
163 " \n"
164 " \n"
165 " //---------------------------------------------------------------------- \n"
166 " // Main fragment shader code. \n"
167 " //---------------------------------------------------------------------- \n"
168 " \n"
169 " void main(void) \n"
170 " { \n"
171 " vec3 view = normalize(-vPosition.xyz); \n"
172 " vec3 normal = normalize(vNormal); \n"
173 " vec4 shadow = shadow2DProj(uShadowMap, gl_TexCoord[1]); \n"
174 " gl_FragColor = vec4(shade(vPosition.xyz, view, normal).rgb, shadow.a); \n"
175 " } \n";
176 
177 
178 //---------------------------------------------------------------------------
179 } // namespace chai3d
180 //---------------------------------------------------------------------------
181 
182 //---------------------------------------------------------------------------
183 #endif
184 //---------------------------------------------------------------------------
chai3d::C_SHADER_FONG_FRAG
const std::string C_SHADER_FONG_FRAG
Definition: CShaderFong.h:91
chai3d::C_SHADER_FONG_VERT
const std::string C_SHADER_FONG_VERT
Definition: CShaderFong.h:55
CGlobals.h
Implements option settings for CHAI3D.
chai3d
Definition: CAudioBuffer.cpp:56