Add glitter and more masked stencil channels

1 files changed, 9 insertions, 0 deletions

diff --git a/math.cginc b/math.cginc
index f3af30a..85fe4ea 100644
--- a/math.cginc
+++ b/math.cginc
@@ -5,7 +5,9 @@
 

 #define PI 3.14159265358979323846264

 #define TAU (2 * PI)

+#define HALF_PI (PI * 0.5)

 #define PHI 1.618033989

+#define SQRT_2_RCP 0.707106781

 

 float pow5(float x)

 {

@@ -175,6 +177,13 @@ void domainWarp3Normals(inout float3 normal, inout float3 tangent, float3 basePo
     tangent = normalize(mul(J, tangent));

 }

 

+// Alpha blend `dst` onto `src`.

+// Imagine two transparent planes. We're rendering a situation where you're

+// looking through `front` at `behind`.

+float4 alphaBlend(float4 behind, float4 front) {

+  return float4(front.rgb * front.a + behind.rgb * (1 - front.a), front.a + behind.a * (1 - front.a));

+}

+

 #endif  // __MATH_INC