Changeset 2999 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/mrt.cg

Timestamp:

10/03/08 14:35:07 (16 years ago)

Author:

mattausch

Message:

trying to use smaller fbo

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/mrt.cg (modified) (6 diffs)

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

@@ -38 +38 @@
 {
   float4 col: COLOR0;
-  float4 pos: COLOR1;
+  //float4 pos: COLOR1;
+  float2 pos: COLOR1;
   float4 norm: COLOR2;
 };
@@ -65 +66 @@
 
 
+// bilinear interpolation
+inline float3 Interpol(float2 w, float3 bl, float3 br, float3 tl, float3 tr)
+{
+        float3 x1 = lerp(bl, tl, w.y);
+        float3 x2 = lerp(br, tr, w.y); 
+        float3 v = lerp(x1, x2, w.x); 
+
+        return v;
+}
+
+
 pixel fragtex(fragin IN, 
                           uniform sampler2D dirtTex,
                           uniform float maxDepth,
                           uniform sampler2D tex,
-                          uniform float3 currentPos)
+                          uniform float3 eyePos,
+                          uniform float3 bl,
+                          uniform float3 br,
+                          uniform float3 tl,
+                          uniform float3 tr)
 {
+        float4 texColor = tex2D(tex, IN.texCoord.xy);
+
+        // account for alpha blending
+        if (texColor.w < 0.5f) discard;
+
         pixel pix;
-
-        float4 texColor = tex2D(tex, IN.texCoord.xy);
 
         // save color in first render target
         // hack: use combination of emmisive + diffuse (emmisive used as constant ambient term)
         pix.col = (glstate.material.emission + glstate.material.diffuse) * texColor; 
-        
+
         // save world position in second render target
-        pix.pos = IN.worldPos * maxDepth;
+        //pix.pos = IN.worldPos * maxDepth;
         // save world space normal in third rt
         pix.norm.xyz = IN.normal;
@@ -86 +105 @@
         // store projection coordinates with positions (used for ssao)
         pix.norm.w = IN.projPos.w;
-        // write the depth
-        pix.pos.w = IN.mypos.z / IN.mypos.w;
 
-        // account for alpha blending
-        if (pix.col.w < 0.5f)
-                discard;
+        const float4 projPos = IN.mypos / IN.mypos.w;
+        // store the projected depth
+        pix.pos.y = projPos.z;
+
+        float2 screenCoord = projPos.xy * 0.5f + 0.5f;
+        const float magView = length(Interpol(screenCoord, bl, br, tl, tr));
 
         // hack: squeeze some information about ambient into the texture
         //pix.col.w = glstate.material.emission.x;
-        pix.col.w = length(currentPos - IN.worldPos) * maxDepth;
+
+        // eye linear depth
+        pix.col.w = (length(eyePos - IN.worldPos.xyz) * maxDepth) / magView;
+        pix.pos.x = pix.col.x;
 
         return pix;
@@ -101 +124 @@
 
 
-pixel frag(fragin IN, uniform float maxDepth, uniform float3 currentPos)
+pixel frag(fragin IN, 
+                   uniform float maxDepth, 
+                   uniform float3 eyePos,
+                   uniform float3 bl,
+                   uniform float3 br,
+                   uniform float3 tl,
+                   uniform float3 tr)
 {
         pixel pix;
@@ -107 +136 @@
         // hack: use comination of emmisive + diffuse (emmisive used as constant ambient term)
         pix.col = glstate.material.diffuse + glstate.material.emission;
-        pix.pos = IN.worldPos * maxDepth;
+        //pix.pos = IN.worldPos * maxDepth;
 
         pix.norm.xyz = IN.normal;
@@ -113 +142 @@
         // store projection coordinates with positions (used for ssao)
         pix.norm.w = IN.mypos.w;
-        // the projected depth
-        pix.pos.w = IN.mypos.z / IN.mypos.w;
-        
+
+        const float4 projPos = IN.mypos / IN.mypos.w;
+        // store the projected depth
+        pix.pos.y = projPos.z;
+
+        float2 screenCoord = projPos.xy * 0.5f + 0.5f;
+        const float magView = length(Interpol(screenCoord, bl, br, tl, tr));
+
         // hack: squeeze some information about the ambient term into the target
         //pix.col.w = glstate.material.emission.x;
-        pix.col.w = length(currentPos - IN.worldPos) * maxDepth;
+        pix.col.w = (length(eyePos - IN.worldPos.xyz) * maxDepth) / magView;
+        pix.pos.x = pix.col.x;
 
         return pix;