1 files changed, 29 insertions, 0 deletions
diff --git a/demo/d3d/shaders/diffusePS.hlsl b/demo/d3d/shaders/diffusePS.hlsl
new file mode 100644
index 0000000..b548b49
--- /dev/null
+++ b/demo/d3d/shaders/diffusePS.hlsl
@@ -0,0 +1,29 @@
+#include "shaderCommon.h"
+
+cbuffer constBuf : register(b0)
+{
+	DiffuseShaderConst gParams;
+};
+
+float sqr(float x) { return x * x; }
+
+float4 diffusePS(DiffuseGeometryOut input) : SV_TARGET
+{
+	float attenuation = 1.0f;
+	float lifeTime = input.worldPos.w;
+	float lifeFade = min(1.0, lifeTime*0.125);
+	float velocityFade = input.viewVel.w;
+
+    // calculate normal from texture coordinates
+    float3 normal = float3(input.uv * 2.0 + float2(-1.0, -1.0), 0.0);
+    float mag = dot(normal.xy, normal.xy);
+    
+	// kill pixels outside circle
+	if (mag > 1.0)
+		discard;   
+
+   	normal.z = 1.0-mag;
+
+	float alpha = lifeFade*velocityFade*sqr(normal.z);
+	return float4(alpha, alpha, alpha, alpha);
+}