Optimize tessellation code - vectorizing and frustrum culling

1 files changed, 24 insertions, 15 deletions

diff --git a/shatter_wave.cginc b/shatter_wave.cginc
index 8636df6..f86a6ac 100644
--- a/shatter_wave.cginc
+++ b/shatter_wave.cginc
@@ -15,11 +15,22 @@ void shatterWaveVert(inout float3 objPos, float3 objNormal, float3 objTangent) {
   float3 wave_axis2 = normalize(_Shatter_Wave_Direction2);

   float3 wave_axis3 = normalize(_Shatter_Wave_Direction3);

   float4x3 wave_axes = float4x3(wave_axis0, wave_axis1, wave_axis2, wave_axis3);

-  float4x3 objPos_proj;

-  objPos_proj[0] = dot(objPos, wave_axis0) * normalize(wave_axis0);

-  objPos_proj[1] = dot(objPos, wave_axis1) * normalize(wave_axis1);

-  objPos_proj[2] = dot(objPos, wave_axis2) * normalize(wave_axis2);

-  objPos_proj[3] = dot(objPos, wave_axis3) * normalize(wave_axis3);

+  

+  float4 projDots = mul(wave_axes, objPos);

+  // Equivalent code:

+  // float4 projDots = float4(

+  //   dot(objPos, wave_axis0),

+  //   dot(objPos, wave_axis1),

+  //   dot(objPos, wave_axis2),

+  //   dot(objPos, wave_axis3)

+  // );

+  

+  float4x3 objPos_proj = float4x3(

+    projDots.x * wave_axis0,

+    projDots.y * wave_axis1,

+    projDots.z * wave_axis2,

+    projDots.w * wave_axis3

+  );

 

 #if defined(_SHATTER_WAVE_AUDIOLINK)

   float4 wave_t;

@@ -64,25 +75,23 @@ void shatterWaveVert(inout float3 objPos, float3 objNormal, float3 objTangent) {
 

   float4 wave_center = wave_t;

 

-  // TODO calculate signed distance from wave center

-  float4 distance_signed;

-  for (uint i = 0; i < 4; i++) {

-    float3 dist_to_center = objPos_proj[i] - wave_center[i] * wave_axes[i];

-    distance_signed[i] = dot(dist_to_center, wave_axes[i]);

-  }

+  float4 distance_signed = float4(

+    dot(objPos_proj[0] - wave_center.x * wave_axes[0], wave_axes[0]),

+    dot(objPos_proj[1] - wave_center.y * wave_axes[1], wave_axes[1]),

+    dot(objPos_proj[2] - wave_center.z * wave_axes[2], wave_axes[2]),

+    dot(objPos_proj[3] - wave_center.w * wave_axes[3], wave_axes[3])

+  );

 

 #if defined(_SHATTER_WAVE_ROTATION)

   float4 thetas = clamp(distance_signed * _Shatter_Wave_Rotation_Strength, -1, 1) * TAU;

+  [unroll]

   for (uint i = 0; i < 4; i++) {

     objPos = rotate_vector(objPos, get_quaternion(wave_axes[i], thetas[i]));

   }

 #endif

 

   float4 offset = exp(-abs(distance_signed) * _Shatter_Wave_Power) * _Shatter_Wave_Amplitude;

-  objPos += objNormal * offset[0];

-  objPos += objNormal * offset[1];

-  objPos += objNormal * offset[2];

-  objPos += objNormal * offset[3];

+  objPos += objNormal * (offset.x + offset.y + offset.z + offset.w);

 }

 

 void shatterWaveFrag(inout float3 normal, float3 objPos) {