Changeset 2991 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/tonemap.cg

Timestamp:

10/02/08 16:34:58 (16 years ago)

Author:

mattausch

Message:

what todo with tone mapping: manually donwsample??
or manually downsample ssao?? or use smaller rendertarget for ssao solution??

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/tonemap.cg (modified) (1 diff)

GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/tonemap.cg

@@ -105 +105 @@
         return OUT;
 }
+
+
+pixel CalcAvgLogLum(frag IN, uniform sampler2D colors)
+{
+        ////////////
+        //-- write out logaritmic luminance for tone mapping
+
+        pixel OUT;
+
+        // the old loglum is stored in the hightest mipmap-level
+        float4 color = tex2Dlod(colors, float4(IN.texCoord.xy, 0, 0));
+        float oldLogLum = tex2Dlod(colors, float4(IN.texCoord.xy, 0, MAX_LOD_LEVEL)).w;
+
+        // the intensity weights
+        const float3 w = float3(0.299f, 0.587f, 0.114f);
+
+        float lum = dot(color.rgb, w);
+        float logLum = log(1e-5f + lum);
+
+        float logLumOffset = MINLOGLUM * INV_LOGLUM_RANGE;
+        float logLumScaled = logLum * INV_LOGLUM_RANGE - logLumOffset;
+
+        OUT.color = color;
+
+        if (oldLogLum > 0)
+                OUT.color.w = lerp(oldLogLum, logLumScaled, 0.1f);
+        else
+                OUT.color.w = logLumScaled;
+}