1 files changed, 106 insertions, 0 deletions
diff --git a/samples/resources/shaders/pointsprite.hlsl b/samples/resources/shaders/pointsprite.hlsl
new file mode 100644
index 0000000..2bff194
--- /dev/null
+++ b/samples/resources/shaders/pointsprite.hlsl
@@ -0,0 +1,106 @@
+#include "common_buffers.hlsl"
+#include "lighting.hlsl"
+
+SamplerState linearSampler : register(s0);
+SamplerState pointSampler : register(s1);
+Texture2D diffuseTexture : register(t0);
+Texture2D<float> depthTexture   : register(t1);
+
+static const float POINT_SIZE = 1.00f;
+static const float FADE_DISTANCE = 1.0f;
+
+struct VS_INPUT
+{
+	float3 position : POSITION0;
+	float4 color : COLOR0;
+	float2 scale : TANGENT;
+};
+
+struct VS_OUTPUT
+{
+	float4 position : SV_POSITION;
+	float4 color : COLOR0;
+	float2 uv : TEXCOORD0;
+	float2 screenPos : TEXCOORD1;
+	float2 depth : TEXCOORD2;
+	float2  pointSize  : PSIZE;
+};
+
+VS_OUTPUT VS(VS_INPUT iV)
+{
+	VS_OUTPUT oV;
+
+	float4 worldSpacePos = mul(float4(iV.position, 1.0f), model);
+	oV.position = mul(worldSpacePos, viewProjection);
+
+	oV.color = iV.color;
+	oV.uv = float2(0, 0);
+	
+	// uncomment to use scale
+	//oV.pointSize = iV.scale * POINT_SIZE;
+	oV.pointSize = float2(1, 1) * POINT_SIZE;
+
+	return oV;
+}
+
+static const float4 SPRITE_VERTEX_POSITIONS[4] = 
+{
+    float4(  0.5, -0.5, 0, 0),
+    float4(  0.5,  0.5, 0, 0),
+    float4( -0.5, -0.5, 0, 0),
+    float4( -0.5,  0.5, 0, 0),
+};
+
+static const float2 SPRITE_VERTEX_TEXCOORDS[4] = 
+{ 
+	float2(1, 0), 
+	float2(1, 1),
+	float2(0, 0),
+	float2(0, 1),
+};
+
+[maxvertexcount(4)]
+void GS( point VS_OUTPUT sprite[1], inout TriangleStream<VS_OUTPUT> triStream )
+{
+    VS_OUTPUT v;
+
+	v.color = sprite[0].color;
+	v.pointSize = sprite[0].pointSize;                      
+    
+	float4 aspectFactor = float4((projection[0][0] / projection[1][1]) * v.pointSize.x, 1.0 * v.pointSize.y, 0, 0);
+	
+	[unroll] for(int i = 0; i < 4; ++i)
+	{
+		v.position = sprite[0].position + SPRITE_VERTEX_POSITIONS[i] * aspectFactor;
+		v.screenPos = v.position.xy / v.position.w;
+		v.depth = v.position.zw;
+		v.uv = SPRITE_VERTEX_TEXCOORDS[i];
+		triStream.Append(v);
+	}
+	
+    triStream.RestartStrip();	
+}
+
+float4 PS(VS_OUTPUT input) : SV_Target0
+{
+	// soft particles fade:
+    float2 screenPos = 0.5*( (input.screenPos) + float2(1,1));
+    screenPos.y = 1 - screenPos.y;
+	
+    float particleDepth = input.depth.x / input.depth.y;
+
+	float depthSample = depthTexture.Sample(pointSampler, screenPos);
+        
+	float4 depthViewSample = mul(float4(input.screenPos, depthSample, 1), projectionInv );
+	float4 depthViewParticle = mul(float4(input.screenPos, particleDepth, 1), projectionInv);
+
+	float depthDiff = depthViewSample.z / depthViewSample.w - depthViewParticle.z / depthViewParticle.w;
+	if( depthDiff < 0 )
+		discard;
+            
+    float depthFade = saturate( depthDiff / FADE_DISTANCE );
+	
+	float4 textureColor = diffuseTexture.Sample(linearSampler, input.uv) * input.color;
+	textureColor.a *= depthFade;
+	return textureColor;
+}
+\ No newline at end of file