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#ifndef LIGHTWEIGHT_PARTICLES_INCLUDED
#define LIGHTWEIGHT_PARTICLES_INCLUDED
#include "Core.hlsl"
#include "CoreRP/ShaderLibrary/Color.hlsl"
#include "InputSurfaceCommon.hlsl"
CBUFFER_START(UnityPerMaterial)
float4 _SoftParticleFadeParams;
float4 _CameraFadeParams;
float4 _MainTex_ST;
half4 _Color;
half4 _EmissionColor;
half4 _SpecColor;
#if defined (_COLORADDSUBDIFF_ON)
half4 _ColorAddSubDiff;
#endif
half _Cutoff;
half _Shininess;
half _Metallic;
half _Glossiness;
half _BumpScale;
CBUFFER_END
TEXTURE2D(_CameraDepthTexture); SAMPLER(sampler_CameraDepthTexture);
TEXTURE2D(_SpecGlossMap); SAMPLER(sampler_SpecGlossMap);
#define SOFT_PARTICLE_NEAR_FADE _SoftParticleFadeParams.x
#define SOFT_PARTICLE_INV_FADE_DISTANCE _SoftParticleFadeParams.y
#define CAMERA_NEAR_FADE _CameraFadeParams.x
#define CAMERA_INV_FADE_DISTANCE _CameraFadeParams.y
// Color function
#if defined(UNITY_PARTICLE_INSTANCING_ENABLED)
#define vertColor(c) \
vertInstancingColor(c);
#else
#define vertColor(c)
#endif
// Flipbook vertex function
#if defined(UNITY_PARTICLE_INSTANCING_ENABLED)
#if defined(_FLIPBOOK_BLENDING)
#define vertTexcoord(v, o) \
vertInstancingUVs(v.texcoords.xy, o.texcoord, o.texcoord2AndBlend);
#else
#define vertTexcoord(v, o) \
vertInstancingUVs(v.texcoords.xy, o.texcoord); \
o.texcoord = TRANSFORM_TEX(o.texcoord, _MainTex);
#endif
#else
#if defined(_FLIPBOOK_BLENDING)
#define vertTexcoord(v, o) \
o.texcoord = v.texcoords.xy; \
o.texcoord2AndBlend.xy = v.texcoords.zw; \
o.texcoord2AndBlend.z = v.texcoordBlend;
#else
#define vertTexcoord(v, o) \
o.texcoord = TRANSFORM_TEX(v.texcoords.xy, _MainTex);
#endif
#endif
// Fading vertex function
#if defined(SOFTPARTICLES_ON) || defined(_FADING_ON)
#define vertFading(o, positionWS, positionCS) \
o.projectedPosition.xy = positionCS.xy * 0.5 + positionCS.w; \
o.projectedPosition.y *= _ProjectionParams.x; \
o.projectedPosition.w = positionCS.w; \
o.projectedPosition.z = -TransformWorldToView(positionWS.xyz).z
#else
#define vertFading(o, positionWS, positionCS)
#endif
// Color blending fragment function
#if defined(_COLOROVERLAY_ON)
#define fragColorMode(i) \
albedo.rgb = lerp(1 - 2 * (1 - albedo.rgb) * (1 - i.color.rgb), 2 * albedo.rgb * i.color.rgb, step(albedo.rgb, 0.5)); \
albedo.a *= i.color.a;
#elif defined(_COLORCOLOR_ON)
#define fragColorMode(i) \
half3 aHSL = RgbToHsv(albedo.rgb); \
half3 bHSL = RgbToHsv(i.color.rgb); \
half3 rHSL = half3(bHSL.x, bHSL.y, aHSL.z); \
albedo = half4(HsvToRgb(rHSL), albedo.a * i.color.a);
#elif defined(_COLORADDSUBDIFF_ON)
#define fragColorMode(i) \
albedo.rgb = albedo.rgb + i.color.rgb * _ColorAddSubDiff.x; \
albedo.rgb = lerp(albedo.rgb, abs(albedo.rgb), _ColorAddSubDiff.y); \
albedo.a *= i.color.a;
#else
#define fragColorMode(i) \
albedo *= i.color;
#endif
// Pre-multiplied alpha helper
#if defined(_ALPHAPREMULTIPLY_ON)
#define ALBEDO_MUL albedo
#else
#define ALBEDO_MUL albedo.a
#endif
// Soft particles fragment function
#if defined(SOFTPARTICLES_ON) && defined(_FADING_ON)
#define fragSoftParticles(i) \
if (SOFT_PARTICLE_NEAR_FADE > 0.0 || SOFT_PARTICLE_INV_FADE_DISTANCE > 0.0) \
{ \
float sceneZ = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, sampler_CameraDepthTexture, i.projectedPosition.xy / i.projectedPosition.w), _ZBufferParams); \
float fade = saturate (SOFT_PARTICLE_INV_FADE_DISTANCE * ((sceneZ - SOFT_PARTICLE_NEAR_FADE) - i.projectedPosition.z)); \
ALBEDO_MUL *= fade; \
}
#else
#define fragSoftParticles(i)
#endif
// Camera fading fragment function
#if defined(_FADING_ON)
#define fragCameraFading(i) \
float cameraFade = saturate((i.projectedPosition.z - CAMERA_NEAR_FADE) * CAMERA_INV_FADE_DISTANCE); \
ALBEDO_MUL *= cameraFade;
#else
#define fragCameraFading(i)
#endif
// Vertex shader input
struct appdata_particles
{
float4 vertex : POSITION;
float3 normal : NORMAL;
half4 color : COLOR;
#if defined(_FLIPBOOK_BLENDING) && !defined(UNITY_PARTICLE_INSTANCING_ENABLED)
float4 texcoords : TEXCOORD0;
float texcoordBlend : TEXCOORD1;
#else
float2 texcoords : TEXCOORD0;
#endif
#if defined(_NORMALMAP)
float4 tangent : TANGENT;
#endif
};
struct VertexOutputLit
{
half4 color : COLOR;
float2 texcoord : TEXCOORD0;
#if _NORMALMAP
half3 tangent : TEXCOORD1;
half3 binormal : TEXCOORD2;
half3 normal : TEXCOORD3;
#else
half3 normal : TEXCOORD1;
#endif
#if defined(_FLIPBOOK_BLENDING)
float3 texcoord2AndBlend : TEXCOORD4;
#endif
#if defined(SOFTPARTICLES_ON) || defined(_FADING_ON)
float4 projectedPosition : TEXCOORD5;
#endif
float4 posWS : TEXCOORD6; // xyz: position; w = fogFactor;
half4 viewDirShininess : TEXCOORD7; // xyz: viewDir; w = shininess
float4 clipPos : SV_POSITION;
};
half4 readTexture(TEXTURE2D_ARGS(_Texture, sampler_Texture), VertexOutputLit IN)
{
half4 color = SAMPLE_TEXTURE2D(_Texture, sampler_Texture, IN.texcoord);
#ifdef _FLIPBOOK_BLENDING
half4 color2 = SAMPLE_TEXTURE2D(_Texture, sampler_Texture, IN.texcoord2AndBlend.xy);
color = lerp(color, color2, IN.texcoord2AndBlend.z);
#endif
return color;
}
half3 SampleNormalTS(VertexOutputLit IN, TEXTURE2D_ARGS(bumpMap, sampler_bumpMap), half scale = 1.0h)
{
#if defined(_NORMALMAP)
half4 n = readTexture(TEXTURE2D_PARAM(bumpMap, sampler_bumpMap), IN);
#if BUMP_SCALE_NOT_SUPPORTED
return UnpackNormal(n);
#else
return UnpackNormalScale(n, scale);
#endif
#else
return half3(0.0h, 0.0h, 1.0h);
#endif
}
half3 SampleEmission(VertexOutputLit IN, half3 emissionColor, TEXTURE2D_ARGS(emissionMap, sampler_emissionMap))
{
#if defined(_EMISSION)
return readTexture(TEXTURE2D_PARAM(emissionMap, sampler_emissionMap), IN).rgb * emissionColor.rgb;
#else
return half3(0.0h, 0.0h, 0.0h);
#endif
}
half4 SampleAlbedo(VertexOutputLit IN, TEXTURE2D_ARGS(albedoMap, sampler_albedoMap))
{
half4 albedo = readTexture(TEXTURE2D_PARAM(albedoMap, sampler_albedoMap), IN) * IN.color;
// No distortion Support
fragColorMode(IN);
fragSoftParticles(IN);
fragCameraFading(IN);
return albedo;
}
half4 SampleSpecularGloss(VertexOutputLit IN, half alpha, half4 specColor, TEXTURE2D_ARGS(specGlossMap, sampler_specGlossMap))
{
half4 specularGloss = half4(0.0h, 0.0h, 0.0h, 1.0h);
#ifdef _SPECGLOSSMAP
specularGloss = readTexture(TEXTURE2D_PARAM(specGlossMap, sampler_specGlossMap), IN);
#elif defined(_SPECULAR_COLOR)
specularGloss = specColor;
#endif
#ifdef _GLOSSINESS_FROM_BASE_ALPHA
specularGloss.a = alpha;
#endif
return specularGloss;
}
half AlphaBlendAndTest(half alpha, half cutoff)
{
#if defined(_ALPHABLEND_ON) || defined(_ALPHAPREMULTIPLY_ON) || defined(_ALPHAOVERLAY_ON)
half result = alpha;
#else
half result = 1.0h;
#endif
AlphaDiscard(result, cutoff, 0.0001h);
return result;
}
half3 AlphaModulate(half3 albedo, half alpha)
{
#if defined(_ALPHAMODULATE_ON)
return lerp(half3(1.0h, 1.0h, 1.0h), albedo, alpha);
#else
return albedo;
#endif
}
void InitializeInputData(VertexOutputLit IN, half3 normalTS, out InputData input)
{
input.positionWS = IN.posWS.xyz;
#if _NORMALMAP
input.normalWS = TangentToWorldNormal(normalTS, IN.tangent, IN.binormal, IN.normal);
#else
input.normalWS = FragmentNormalWS(IN.normal);
#endif
input.viewDirectionWS = FragmentViewDirWS(IN.viewDirShininess.xyz);
input.shadowCoord = float4(0, 0, 0, 0);
input.fogCoord = (half)IN.posWS.w;
input.vertexLighting = half3(0.0h, 0.0h, 0.0h);
input.bakedGI = half3(0.0h, 0.0h, 0.0h);
}
#endif // LIGHTWEIGHT_PARTICLES_INCLUDED