Full Template for ticket #1

Templates/Full/game/shaders/common/gl/lighting.glsl

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+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+// These are the uniforms used by most lighting shaders.
+
+uniform vec3 inLightPos[4];
+uniform vec4 inLightInvRadiusSq;
+uniform vec4 inLightColor[4];
+uniform vec4 ambient;
+uniform float specularPower;
+uniform vec4 specularColor;
+
+
+// This is used to limit the maximum processed
+// lights in the compute4Lights down for really
+// low end GPUs.
+//
+// NOTE: If you want to support 10.5.x, this needs to be changed to 2.
+#define C4L_MAX_LIGHTS 4
+
+
+void compute4Lights( vec3 wsView, 
+                     vec3 wsPosition, 
+                     vec3 wsNormal, 
+                     out vec4 outDiffuse,
+                     out vec4 outSpecular )
+{
+   #ifdef PHONG_SPECULAR 
+      // (R.V)^c
+      float reflected = reflect( wsView, wsNormal );
+   #endif
+
+   vec4 nDotL = vec4( 0.0 );
+   vec4 rDotL = vec4( 0.0 );
+   vec4 sqDists = vec4( 0.0 );
+   int i;
+
+   for ( i = 0; i < C4L_MAX_LIGHTS; ++i )
+   {
+      vec3 lightVector = inLightPos[i] - wsPosition;
+      vec3 lightDirection = normalize( lightVector );
+
+      nDotL[i] = max( dot( lightDirection, wsNormal ), 0.0 );
+
+      #ifdef PHONG_SPECULAR
+         rDotL[i] = saturate( dot( lightDirection, reflected ) );
+      #else
+         // (N.H)^c [Blinn-Phong, TGEA style, default]
+         rDotL[i] = dot( wsNormal, normalize( lightDirection + wsView ) );
+      #endif
+
+      sqDists[i] = dot( lightVector, lightVector );
+   }
+
+   // Attenuation
+   vec4 atten = vec4( 1.0 ) - ( sqDists * inLightInvRadiusSq );
+
+   // Combine the light colors for output.
+   vec4 diffuse = clamp( nDotL * atten, vec4( 0.0 ), vec4( 1.0 ) );
+   outDiffuse = vec4( 0.0 );
+   for ( i = 0; i < C4L_MAX_LIGHTS; ++i )
+      outDiffuse += vec4( diffuse[i] ) * inLightColor[i];
+
+   // Output the specular power.
+   rDotL = max( rDotL, vec4( 0.00001 ) );
+   outSpecular = pow( rDotL, vec4( specularPower ) );
+}
+
+
+/// The standard specular calculation.
+///
+///   @param toLight    Normalized vector representing direction from the pixel 
+///                     being lit, to the light source, in world space.
+///
+///   @param normal  Normalized surface normal.
+///   
+///   @param toEye   The normalized vector representing direction from the pixel 
+///                  being lit to the camera.
+///
+///   @param specPwr    The specular exponent.
+///
+///   @param specScale  A scalar on the specular output used in RGB accumulation.
+///
+float calcSpecular( vec3 toLight, vec3 normal, vec3 toEye, float specPwr )
+{
+   #ifdef PHONG_SPECULAR 
+      // (R.V)^c
+      float specVal = dot( normalize( -reflect( toLight, normal ) ), toEye );
+   #else
+      // (N.H)^c [Blinn-Phong, TGEA style, default]
+      float specVal = dot( normal, normalize( toLight + toEye ) );
+   #endif
+
+   // Return the specular factor.
+   return pow( max( specVal, 0.00001f ), specPwr );
+}