#ifndef SPRITE_LIGHTING_INCLUDED
|
#define SPRITE_LIGHTING_INCLUDED
|
|
//Check for using mesh normals
|
#if !defined(_FIXED_NORMALS) && !defined(_FIXED_NORMALS_BACK_RENDERING)
|
#define MESH_NORMALS
|
#endif // _FIXED_NORMALS || _FIXED_NORMALS_BACK_RENDERING
|
|
////////////////////////////////////////
|
// Vertex structs
|
//
|
|
struct VertexInput
|
{
|
float4 vertex : POSITION;
|
float4 texcoord : TEXCOORD0;
|
float4 color : COLOR;
|
#if defined(MESH_NORMALS)
|
float3 normal : NORMAL;
|
#endif // MESH_NORMALS
|
#if defined(_NORMALMAP)
|
float4 tangent : TANGENT;
|
#endif // _NORMALMAP
|
|
};
|
|
////////////////////////////////////////
|
// Normal functions
|
//
|
|
//Fixed Normal defined in view space
|
uniform float4 _FixedNormal = float4(0, 0, -1, 1);
|
|
inline half3 calculateSpriteWorldNormal(VertexInput vertex)
|
{
|
#if defined(MESH_NORMALS)
|
return calculateWorldNormal(vertex.normal);
|
#else //MESH_NORMALS
|
//Rotate fixed normal by inverse camera matrix to convert the fixed normal into world space
|
float3x3 invView = transpose((float3x3)UNITY_MATRIX_VP);
|
float3 normal = _FixedNormal.xyz;
|
#if UNITY_REVERSED_Z
|
normal.z = -normal.z;
|
#endif
|
return normalize(mul(invView, normal));
|
#endif // !MESH_NORMALS
|
}
|
|
inline half3 calculateSpriteViewNormal(VertexInput vertex)
|
{
|
#if defined(MESH_NORMALS)
|
return normalize(mul((float3x3)UNITY_MATRIX_IT_MV, vertex.normal));
|
#else // !MESH_NORMALS
|
float3 normal = _FixedNormal.xyz;
|
#if UNITY_REVERSED_Z
|
normal.z = -normal.z;
|
#endif
|
return normal;
|
#endif // !MESH_NORMALS
|
}
|
|
////////////////////////////////////////
|
// Normal map functions
|
//
|
|
#if defined(_NORMALMAP)
|
|
inline half3 calculateSpriteWorldBinormal(half3 normalWorld, half3 tangentWorld, float tangentW)
|
{
|
#if defined(_FIXED_NORMALS_BACK_RENDERING)
|
//If we're using fixed normals and sprite is facing away from camera, flip tangentW
|
float3 zAxis = float3(0.0, 0.0, 1.0);
|
float3 modelForward = mul((float3x3)unity_ObjectToWorld, zAxis);
|
float3 cameraForward = mul((float3x3)UNITY_MATRIX_VP, zAxis);
|
float directionDot = dot(modelForward, cameraForward);
|
//Don't worry if directionDot is zero, sprite will be side on to camera so invisible meaning it doesnt matter that tangentW will be zero too
|
tangentW *= sign(directionDot);
|
#endif // _FIXED_NORMALS_BACK_RENDERING
|
|
return calculateWorldBinormal(normalWorld, tangentWorld, tangentW);
|
}
|
|
#endif // _NORMALMAP
|
|
#if defined(_DIFFUSE_RAMP)
|
|
|
////////////////////////////////////////
|
// Diffuse ramp functions
|
//
|
|
//Disable for softer, more traditional diffuse ramping
|
#define HARD_DIFFUSE_RAMP
|
|
uniform sampler2D _DiffuseRamp;
|
|
inline fixed3 calculateDiffuseRamp(float ramp)
|
{
|
return tex2D(_DiffuseRamp, float2(ramp, ramp)).rgb;
|
}
|
|
inline fixed3 calculateRampedDiffuse(fixed3 lightColor, float attenuation, float angleDot)
|
{
|
float d = angleDot * 0.5 + 0.5;
|
#if defined(HARD_DIFFUSE_RAMP)
|
half3 ramp = calculateDiffuseRamp(d * attenuation * 2);
|
return lightColor * ramp;
|
#else
|
half3 ramp = calculateDiffuseRamp(d);
|
return lightColor * ramp * (attenuation * 2);
|
#endif
|
}
|
#endif // _DIFFUSE_RAMP
|
|
////////////////////////////////////////
|
// Rim Lighting functions
|
//
|
|
#ifdef _RIM_LIGHTING
|
|
uniform float _RimPower;
|
uniform fixed4 _RimColor;
|
|
inline fixed3 applyRimLighting(fixed3 posWorld, fixed3 normalWorld, fixed4 pixel) : SV_Target
|
{
|
fixed3 viewDir = normalize(_WorldSpaceCameraPos - posWorld);
|
float invDot = 1.0 - saturate(dot(normalWorld, viewDir));
|
float rimPower = pow(invDot, _RimPower);
|
float rim = saturate(rimPower * _RimColor.a);
|
|
#if defined(_DIFFUSE_RAMP)
|
rim = calculateDiffuseRamp(rim).r;
|
#endif
|
|
return lerp(pixel.rgb, _RimColor.xyz * pixel.a, rim);
|
}
|
|
#endif //_RIM_LIGHTING
|
|
////////////////////////////////////////
|
// Emission functions
|
//
|
|
#ifdef _EMISSION
|
|
uniform sampler2D _EmissionMap;
|
uniform fixed4 _EmissionColor;
|
uniform float _EmissionPower;
|
|
|
#define APPLY_EMISSION(diffuse, uv) \
|
{ \
|
diffuse += tex2D(_EmissionMap, uv).rgb * _EmissionColor.rgb * _EmissionPower; \
|
}
|
|
#else //!_EMISSION
|
|
#define APPLY_EMISSION(diffuse, uv)
|
|
#endif //!_EMISSION
|
|
#endif // SPRITE_LIGHTING_INCLUDED
|
