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[Unity] Creating my own shader with shadows for LightWeightRenderPipeline(LWRP)
sampler2D _ScreenSpaceShadowMap;
#define SHADOW_COORDS(idx1) float4 shadowCoord : TEXCOORD##idx1;
#define TRANSFER_SHADOW(a) a.shadowCoord = CustomCalculateScreenPos(a.pos)
#define SHADOW_ATTENUATION(i) tex2D(_ScreenSpaceShadowMap, i.shadowCoord.xy/i.shadowCoord.w).x
inline float4 CustomCalculateScreenPos(float4 pos) {
float4 o = pos * 0.5f;
o.xy = float2(o.x, o.y*_ProjectionParams.x) + o.w;
o.zw = pos.zw;
return o;
}
Shader "App/ShadowTest"
{
Properties
{
[NoScaleOffset] _MainTex("Texture", 2D) = "white" {}
}
SubShader
{
Pass
{
Tags{ "LightMode" = "LightweightForward" }
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#include "CustomAutoLight.cginc"
struct v2f
{
float2 uv : TEXCOORD0;
float4 shadowCoord : TEXCOORD1;
float4 pos : SV_POSITION;
};
inline float4 CalculateScreenPos(float4 pos) {
float4 o = pos * 0.5f;
o.xy = float2(o.x, o.y*_ProjectionParams.x) + o.w;
o.zw = pos.zw;
return o;
}
v2f vert(appdata_base v)
{
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv = v.texcoord;
// compute shadows data
TRANSFER_SHADOW(o);
return o;
}
sampler2D _MainTex;
fixed4 frag(v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.uv);
fixed shadow = SHADOW_ATTENUATION(i);
col.rgb *= clamp(shadow + 0.5, 0.0,1.0);
return col;
}
ENDCG
}
Pass{
Tags{ "LightMode" = "DepthOnly" }
ZWrite On
ColorMask 0
Cull[_Cull]
CGPROGRAM
#pragma vertex depthVert
#pragma fragment depthFrag
#include "UnityCG.cginc"
struct v2f
{
float4 pos : SV_POSITION;
};
v2f depthVert(appdata_base v)
{
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
return o;
}
fixed4 depthFrag(v2f i) : SV_Target
{
return 0;
}
ENDCG
}
Pass
{
Tags{"LightMode" = "ShadowCaster"}
ZWrite On
ZTest LEqual
Cull[_Cull]
HLSLPROGRAM
// Required to compile gles 2.0 with standard srp library
#pragma prefer_hlslcc gles
#pragma exclude_renderers d3d11_9x
#pragma target 2.0
// -------------------------------------
// Material Keywords
#pragma shader_feature _ALPHATEST_ON
//--------------------------------------
// GPU Instancing
#pragma multi_compile_instancing
#pragma shader_feature _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
#pragma vertex ShadowPassVertex
#pragma fragment ShadowPassFragment
#include "LWRP/ShaderLibrary/InputSurfacePBR.hlsl"
#include "LWRP/ShaderLibrary/LightweightPassShadow.hlsl"
ENDHLSL
}
}
}
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