Changeset 3017 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/mrt.cg

Timestamp:

10/09/08 11:19:33 (16 years ago)

Author:

mattausch

Message:

 

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/mrt.cg (modified) (8 diffs)

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

@@ -17 +17 @@
   float4 worldPos: TEXCOORD1; // world position
   float3 normal: TEXCOORD2;
-  float4 mypos: TEXCOORD3;
+  float4 projPos: TEXCOORD3;
 };
 
@@ -28 +28 @@
         float4 texCoord: TEXCOORD0;    
 
-        float4 projPos: WPOS;
+        float4 winPos: WPOS;
         float4 worldPos: TEXCOORD1; // world position
         float3 normal: TEXCOORD2;
-        float4 mypos: TEXCOORD3;
+        float4 projPos: TEXCOORD3;
 };
 
@@ -38 +38 @@
 {
         float4 col: COLOR0;
-        float4 norm: COLOR1;
+        float3 norm: COLOR1;
         float3 pos: COLOR2;
 };
@@ -59 +59 @@
 
         OUT.normal = IN.normal;
-        OUT.mypos = OUT.position;
+        OUT.projPos = OUT.position;
 
         return OUT;
@@ -75 +75 @@
 }
 
+//#pragma position_invariant fragtex
 
 pixel fragtex(fragin IN, 
@@ -96 +97 @@
         // hack: use combination of emmisive + diffuse (emmisive used as constant ambient term)
         pix.col = (glstate.material.emission + glstate.material.diffuse) * texColor; 
-        // save world space normal in third rt
-        pix.norm.xyz = IN.normal;
-        // store projection coordinates with positions (used for ssao)
-        pix.norm.w = IN.projPos.w;
+        // save world space normal in rt
+        pix.norm = IN.normal;
 
-        const float4 projPos = IN.mypos / IN.mypos.w;
-        
         // hack: squeeze some information about ambient into the texture
         //pix.col.w = glstate.material.emission.x;
 
         // compute eye linear depth
-        const float2 screenCoord = projPos.xy * 0.5f + 0.5f;
-        const float magView = length(Interpol(screenCoord, bl, br, tl, tr));
-        pix.col.w = length(eyePos - IN.worldPos.xyz) / magView;
-
-#if 0
-        // save world position in second render target
-        pix.pos = IN.worldPos.xyz * maxDepth;
-#endif
+        const float4 projPos = IN.projPos / IN.projPos.w;
+        
+        float2 screenCoord = projPos.xy * 0.5f + 0.5f;
+        
+        const float3 viewVec = Interpol(screenCoord, bl, br, tl, tr);
+        const float invMagView = 1.0f / length(viewVec);
+        // note: has to done in this order, otherwise strange precision problems!
+        pix.col.w = invMagView * length(eyePos - IN.worldPos.xyz);
 
         return pix;
@@ -132 +129 @@
         pix.col = glstate.material.diffuse + glstate.material.emission;
 
-        pix.norm.xyz = IN.normal;
-        
-        // store projection coordinates with positions (used for ssao)
-        pix.norm.w = IN.mypos.w;
-
-        const float4 projPos = IN.mypos / IN.mypos.w;
+        pix.norm = IN.normal;
 
         // hack: squeeze some information about the ambient term into the target
@@ -143 +135 @@
         
         // compute eye linear depth and scale with lenght to avoid sqr root in pixel shader
+        const float4 projPos = IN.projPos / IN.projPos.w;
+        
         float2 screenCoord = projPos.xy * 0.5f + 0.5f;
         const float magView = length(Interpol(screenCoord, bl, br, tl, tr));
-        pix.col.w = length(eyePos - IN.worldPos.xyz)  / magView;
-
-#if 0
-        pix.pos = IN.worldPos.xyz * maxDepth;
-#endif
+        pix.col.w = length(eyePos - IN.worldPos.xyz) / magView;
 
         return pix;