define(`FRAGMENT_SHADER_USE_TEX_COORD',`
#ifdef NEED_TEX_COORD
varying vec2   vTexCoord;
#endif //TEX_COORD')

define(`FRAGMENT_SHADER_USE_TEXTURE', `
#ifdef $1_TEXTURE
uniform sampler2D  uTexture$2`0';
#endif //$1_TEXTURE
#ifdef $1_TEXTURE_BLEND
uniform sampler2D  uTexture$2`1';
uniform float      uTexture$2Weight;
#endif //$1_TEXTURE_BLEND')

define(`FRAGMENT_SHADER_USE_FOG', `
#ifdef FOG_ENABLED
uniform float uFogFactor;
uniform vec4  uFogColor;
#endif //FOG_ENABLED')

define(`FRAGMENT_SHADER_USE_SHADOWS', `
#ifdef  SHADOWED
varying vec4 vLightPosition;
uniform sampler2D uShadowMap;
float shadow;
float pcf(vec4 lpos, float size)
  {
     vec3 smcoord = lpos.xyz / lpos.w * 0.5 + 0.5;
     float i, j, randx, randy, shadow;
     shadow = 0.0;
     for (i = -4.0; i < 4.0; i++)
       for (j = -4.0; j < 4.0; j++)
         shadow += float(smcoord.z <= texture2D(uShadowMap, smcoord.xy + vec2(i / 8.0, j / 8.0)*size).x);
     return shadow / 64.0;
}
#endif //SHADOWED')

define(`FRAGMENT_SHADER_FOG_APPLY', `
#ifdef FOG_ENABLED
   float z = gl_FragCoord.z / gl_FragCoord.w;
   float fogFactor = exp2(-uFogFactor * uFogFactor * z * z * 1.44);
   fogFactor = clamp(fogFactor, 0.0, 1.0);
   gl_FragColor = mix(uFogColor, gl_FragColor, fogFactor);
#endif //FOG_ENABLED')

define(`FRAGMENT_SHADER_USE_LIGHT', `
#ifdef LIGHT_SPOT
uniform   vec3  uLightSpotDir;
uniform   float uLightSpotExp;
uniform   float uLightSpotCutoffCos;
#endif //LIGHT_SPOT
#ifdef LIGHT_ATTENUATION
varying   float    vLightDist;
#endif //LIGHT_ATTENUATION')

define(`FRAGMENT_SHADER_TEXTURE_BLEND', `
#ifdef  $1_TEXTURE_BLEND
   color = texture2D(uTexture$2`0', vTexCoord) * uTexture$2Weight +
   texture2D(uTexture$2`1', vTexCoord) * (1.0 - uTexture$2Weight);
#else
#ifdef  $1_TEXTURE
   color = texture2D(uTexture$2`0', vTexCoord);
#else
   color = uMaterial$2;
#endif //$1_TEXTURE
#endif //$1_TEXTURE_BLEND')

define(`FRAGMENT_SHADER_USE_EMISSION_TERM',
`#ifdef EMISSION'
uniform vec4       uMaterialEmission;
FRAGMENT_SHADER_USE_TEXTURE(EMISSION, Emission)
`#endif //EMISSION')

define(`FRAGMENT_SHADER_USE_SPECULAR_TERM',
`#ifdef SPECULAR'
uniform   vec4     uLightSpecular;
uniform   float    uMaterialShininess;
uniform   vec4     uMaterialSpecular;
FRAGMENT_SHADER_USE_TEXTURE(SPECULAR, Specular)
`#endif //SPECULAR')

define(`FRAGMENT_SHADER_USE_AMBIENT_TERM',
`#ifdef AMBIENT'
uniform  vec4       uMaterialAmbient;
uniform  vec4       uLightAmbient;
FRAGMENT_SHADER_USE_TEXTURE(AMBIENT, Ambient)
`#endif //AMBIENT')

define(`FRAGMENT_SHADER_USE_DIFFUSE_TERM',
`#ifdef DIFFUSE'
uniform   vec4        uMaterialDiffuse;
uniform   vec4        uLightDiffuse;
FRAGMENT_SHADER_USE_TEXTURE(DIFFUSE, Diffuse)
`#endif //DIFFUSE')

define(`VERTEX_SHADER_NEED_TEX_COORD',
`#ifdef NEED_TEX_COORD'
varying vec2 vTexCoord;
`#endif //NEED_TEX_COORD')

define(`VERTEX_SHADER_USE_LIGHT_ATTENUATION',
`#ifdef LIGHT_ATTENUATION'
varying  float vLightDist;
`#endif //LIGHT_ATTENUATION')

define(`VERTEX_SHADER_USE_SHADOWS',
`#ifdef SHADOWED'
uniform mat4 uMatrixLight;
varying vec4 vLightPosition;
`#endif //SHADOWED')

define(`VERTEX_SHADER_USE_POSITION',
`#ifdef VERTEX_POSITION'
attribute   vec4  aPosition0;
`#endif //VERTEX_POSITION'

`#ifdef VERTEX_POSITION_BLEND'
attribute   vec4  aPosition1;
uniform     float uPositionWeight;
`#endif //VERTEX_POSITION_BLEND')

define(`VERTEX_SHADER_USE_NORMALS',
`#ifdef VERTEX_NORMAL'
attribute   vec4  aNormal0;
`#endif //VERTEX_NORMAL'

`#ifdef VERTEX_NORMAL_BLEND'
attribute   vec4  aNormal1;
uniform     float uNormalWeight;
`#endif //VERTEX_NORMAL_BLEND'
)

define(`VERTEX_SHADER_USE_TEXCOORD',
`#ifdef VERTEX_TEXCOORD'
attribute   vec4  aTexCoord0;
`#endif //VERTEX_TEXCOORD'

`#ifdef VERTEX_TEXCOORD_BLEND'
attribute   vec4  aTexCoord1;
uniform     float uTexCoordWeight;
`#endif //VERTEX_TEXCOORD_BLEND'
)

define(`VERTEX_SHADER_POSITION',
`#ifdef VERTEX_POSITION_BLEND'
   vec4 position = aPosition0 * uPositionWeight +
   aPosition1 * (1.0 - uPositionWeight);
   position = vec4(position.xyz, 1.0);
`#else'

`#ifdef VERTEX_POSITION'
   vec4 position = vec4(aPosition0.xyz, 1.0);
`#endif // VERTEX_POSITION'

`#endif //VERTEX_POSITION_BLEND')

define(`VERTEX_SHADER_NORMAL',
`#ifdef VERTEX_NORMAL_BLEND'
   vec3 normal = aNormal0.xyz * uNormalWeight +
   aNormal1.xyz * (1.0 - uNormalWeight);
`#else'

`#ifdef VERTEX_NORMAL'
   vec3 normal = aNormal0.xyz;
`#endif //VERTEX_NORMAL'
`#endif //VERTEX_NORMAL_BLEND')

define(`VERTEX_SHADER_TEXCOORD',
`#ifdef VERTEX_TEXCOORD_BLEND'
   vTexCoord = aTexCoord0.st * uTexCoordWeight +
   aTexCoord1.st * (1.0 - uTexCoordWeight);
`#else'

`#ifdef VERTEX_TEXCOORD'
   vTexCoord = aTexCoord0.st;
`#endif //VERTEX_TEXCOORD'

`#endif //VERTEX_TEXCOORD_BLEND')

define(`VERTEX_SHADER_SHADOWED',
`#ifdef SHADOWED'
   vLightPosition = uMatrixLight * position;
`#endif //SHADOWED')