Initial commit

Win32.DX11.Release/data/shaders/hlsl/rain_snow.fragment.hlsl

@@ -0,0 +1,56 @@
+#include "ShaderConstants.fxh"
+
+struct PS_Input {
+	float4 position : SV_Position;
+	float2 uv : TEXCOORD_0;
+	float4 color : COLOR;
+	float4 worldPosition : TEXCOORD_1;
+	float4 fogColor : FOG_COLOR;
+};
+
+struct PS_Output {
+	float4 color : SV_Target;
+};
+
+void main( in PS_Input PSInput, out PS_Output PSOutput ) {
+	
+	PSOutput.color = TEXTURE_0.Sample(TextureSampler0, PSInput.uv);
+
+	PSOutput.color.a *= PSInput.color.a;
+
+	float2 uv = PSInput.worldPosition.xz;
+	float4 occlusionTexture = TEXTURE_1.Sample(TextureSampler1, uv);
+
+#ifndef FLIP_OCCLUSION
+#define OCCLUSION_OPERATOR <
+#else
+#define OCCLUSION_OPERATOR >
+#endif
+
+#ifdef SNOW
+#define OCCLUSION_HEIGHT occlusionTexture.g
+#define OCCLUSION_LUMINANCE occlusionTexture.r
+#else
+#define OCCLUSION_HEIGHT occlusionTexture.a
+#define OCCLUSION_LUMINANCE occlusionTexture.b
+#endif
+
+	// clamp the uvs
+	if (uv.x >= 0.0f && uv.x <= 1.0f && 
+		uv.y >= 0.0f && uv.y <= 1.0f && 
+		PSInput.worldPosition.y OCCLUSION_OPERATOR OCCLUSION_HEIGHT) {
+		PSOutput.color.a = 0.0f;
+	}
+
+	float mixAmount = (PSInput.worldPosition.y - OCCLUSION_HEIGHT)*25.0f;
+	float2 lightingUVs = float2(OCCLUSION_LUMINANCE, 1.0f);
+	lightingUVs.x = lerp(lightingUVs.x, 0.0f, mixAmount);
+
+	float3 lighting = TEXTURE_2.Sample(TextureSampler2, lightingUVs);
+	PSOutput.color.rgb *= lighting.rgb;
+
+	//apply fog
+	PSOutput.color.rgb = lerp(PSOutput.color.rgb, PSInput.fogColor.rgb, PSInput.fogColor.a);
+}
+
+