Changeset 3214 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/lenseFlare.cg

Timestamp:

12/08/08 18:48:21 (16 years ago)

Author:

mattausch

Message:

worked on lense flare

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/lenseFlare.cg (modified) (3 diffs)

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

@@ -7 +7 @@
 
 
+inline float2 ComputeTexCoords(float2 tex, float2 v, float dist, float scale, float distScale)
+{
+        const float2 center = float2(.5f, .5f);
+        const float2 newPos = -v * dist * distScale;
+        //const float2 newPos = v * dist * distScale;
+
+        //return (tex - center - newPos) / scale + newPos + center;
+        return (tex - center) / scale + center + newPos / scale;
+        //return tex / scale - center;// + center + newPos;
+}
+
+
+inline float4 ComputeColor(sampler2D tex, float2 texCoords, float2 v, float dist, float scale, float distScale)
+{
+        const float2 newTexCoords = ComputeTexCoords(texCoords, v, dist, scale, distScale);
+        return tex2Dlod(tex, float4(newTexCoords, 0, 0));
+}
+
 
 float4 LenseFlare(fragment IN, 
@@ -14 +32 @@
                                   uniform sampler2D flareTex3,
                                   uniform sampler2D flareTex4,
+                                  uniform sampler2D flareTex5,
                                   uniform float2 vectorToLight, // vector to current light position
                                   uniform float distanceToLight // distance to current light position
@@ -21 +40 @@
         const float4 color = tex2Dlod(colorsTex, float4(IN.texCoords, 0, 0));
         
-        const float scale = 0.5f;
-        const float center = float2(.5f, .5f);
-        const float2 newPos = vectorToLight * distanceToLight;
+        const float scale = 0.3f;
 
-        const float2 newTexCoords = (IN.texCoords - center) / scale + center - newPos;
+        float4 flare[8];
 
-        const float4 flare1 = tex2Dlod(flareTex1, float4(newTexCoords, 0, 0));
+        flare[0] = ComputeColor(flareTex1, IN.texCoords, vectorToLight, distanceToLight, 1.0f * scale, 1.0f);
+        flare[1] = ComputeColor(flareTex2, IN.texCoords, vectorToLight, distanceToLight, 0.7f * scale, 1.0f / 3.0f);
+        flare[2] = ComputeColor(flareTex3, IN.texCoords, vectorToLight, distanceToLight, 0.25f * scale, 0.7f);
+        flare[3] = ComputeColor(flareTex4, IN.texCoords, vectorToLight, distanceToLight, .7f * scale, -1.0f / 2.0f);
+        flare[4] = ComputeColor(flareTex3, IN.texCoords, vectorToLight, distanceToLight, .4f * scale, -1.0f / 6.0f);
 
-        float4 result;
+        flare[5] = ComputeColor(flareTex5, IN.texCoords, vectorToLight, distanceToLight, .1f * scale, 0.5f);
+        flare[6] = ComputeColor(flareTex5, IN.texCoords, vectorToLight, distanceToLight, .2f * scale, -0.25f);
 
-        result.w = color.w;
+        flare[7] = ComputeColor(flareTex2, IN.texCoords, vectorToLight, distanceToLight, 1.0f * scale, -1.0f);
 
-        //const float factor = 0.9f;
-        //result.xyz = lerp(color.xyz, flare1.xyz, factor);
-        //result.xyz = color.xyz * (1.0f - flare1.w) + flare1.xyz * flare1.w;
-        result.xyz = color.xyz + flare1.xyz;
+        float4 result = color;
+
+        //result.xyz = float3(0);
+        for (int i = 0; i < 8; ++ i)
+                result.xyz += flare[i].xyz;
 
         return result;