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#ifndef __DECALS
#define __DECALS
#include "features.cginc"
#include "globals.cginc"
#include "math.cginc"
// Struct to hold all decal parameters
struct DecalParams {
float4 color;
float opacity;
float angle;
float uv_channel;
float4 mainTex_ST;
int tiling_mode;
int alpha_blend_mode;
Texture2D mainTex;
bool sdf_enabled;
bool sdf_invert;
float sdf_threshold;
bool mask_enabled;
Texture2D mask;
bool normal_enabled;
Texture2D normalTex;
float normal_scale;
bool reflections_enabled;
Texture2D metallicGlossMap;
float metallic_value;
float smoothness_value;
};
// Macro to initialize decal parameters
#define INIT_DECAL_PARAMS(params, prefix) \
params.color = prefix##Color; \
params.opacity = prefix##Opacity; \
params.angle = prefix##Angle; \
params.uv_channel = prefix##UV_Channel; \
params.mainTex_ST = prefix##MainTex_ST; \
params.tiling_mode = prefix##Tiling_Mode; \
params.alpha_blend_mode = prefix##Alpha_Blend_Mode; \
params.mainTex = prefix##MainTex; \
params.sdf_enabled = prefix##SDF_Enabled; \
params.sdf_invert = prefix##SDF_Invert; \
params.sdf_threshold = prefix##SDF_Threshold; \
params.mask_enabled = prefix##Mask_Enabled; \
params.mask = prefix##Mask; \
params.normal_enabled = prefix##Normal_Enabled; \
params.normalTex = prefix##Normal; \
params.normal_scale = prefix##Normal_Scale; \
params.reflections_enabled = prefix##Reflections_Enabled; \
params.metallicGlossMap = prefix##MetallicGlossMap; \
params.metallic_value = prefix##Metallic; \
params.smoothness_value = prefix##Smoothness
#define APPLY_DECAL_SEC00_GENERIC(i, albedo, normal_tangent, metallic, smoothness, params) \
float2x2 decal_rot = float2x2( \
cos(params.angle * TAU), -sin(params.angle * TAU), \
sin(params.angle * TAU), cos(params.angle * TAU) \
); \
\
float2 raw_decal_uv = (params.uv_channel == 0) ? i.uv01.xy : i.uv01.zw; \
float2 decal_uv = (raw_decal_uv * params.mainTex_ST.xy + params.mainTex_ST.zw); \
decal_uv = mul(decal_rot, decal_uv); \
decal_uv = (params.tiling_mode == DECAL_TILING_MODE_CLAMP ? saturate(decal_uv) : decal_uv);
#define APPLY_DECAL_SEC01_SDF_ON(i, albedo, normal_tangent, metallic, smoothness, params) \
float4 decal_albedo; \
{ \
float4 sdf_sample = params.mainTex.SampleLevel(linear_repeat_s, decal_uv, 0); \
float sd = sdf_sample.r; \
sd = params.sdf_invert ? 1 - sd : sd; \
sd = (sd > params.sdf_threshold ? 1 : 0); \
decal_albedo = params.color * sd; \
decal_albedo.a *= params.opacity; \
}
#define APPLY_DECAL_SEC01_SDF_OFF(i, albedo, normal_tangent, metallic, smoothness, params) \
float4 decal_albedo; \
{ \
decal_albedo = params.mainTex.Sample(linear_repeat_s, decal_uv); \
decal_albedo *= params.color; \
decal_albedo.a *= params.opacity; \
}
#define APPLY_DECAL_SEC02_CLAMP_ON(i, albedo, normal_tangent, metallic, smoothness, params) \
{ \
float eps = 1e-4; \
float2 uv_clamped = step(eps, decal_uv) * step(decal_uv, 1 - eps); \
decal_albedo.a *= uv_clamped.x * uv_clamped.y; \
}
#define APPLY_DECAL_SEC02_CLAMP_OFF(i, albedo, normal_tangent, metallic, smoothness, params) {}
#define APPLY_DECAL_SEC03_MASK_ON(i, albedo, normal_tangent, metallic, smoothness, params) \
float decal_mask = params.mask.Sample(linear_repeat_s, raw_decal_uv); \
decal_albedo.a *= decal_mask;
#define APPLY_DECAL_SEC03_MASK_OFF(i, albedo, normal_tangent, metallic, smoothness, params) \
float decal_mask = 1;
#define APPLY_DECAL_SEC04_BLEND_MODE_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, params) \
albedo = alphaBlend(albedo, decal_albedo);
#define APPLY_DECAL_SEC04_BLEND_MODE_REPLACE(i, albedo, normal_tangent, metallic, smoothness, params) \
albedo = lerp(albedo, decal_albedo, decal_mask);
#define APPLY_DECAL_SEC05_NORMAL_ON(i, albedo, normal_tangent, metallic, smoothness, params) \
float3 decal_normal = UnpackScaleNormal( \
params.normalTex.Sample(linear_repeat_s, decal_uv), \
params.normal_scale * decal_albedo.a); \
normal_tangent = lerp(normal_tangent, decal_normal, decal_albedo.a);
#define APPLY_DECAL_SEC05_NORMAL_OFF(i, albedo, normal_tangent, metallic, smoothness, params) {}
#define APPLY_DECAL_SEC06_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, params) \
float4 metallic_gloss = params.metallicGlossMap.Sample(linear_repeat_s, decal_uv); \
metallic = lerp(metallic, metallic_gloss.r * params.metallic_value, decal_albedo.a); \
smoothness = lerp(smoothness, metallic_gloss.a * params.smoothness_value, decal_albedo.a);
#define APPLY_DECAL_SEC06_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, params) {}
void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, inout float metallic, inout float smoothness) {
DecalParams decal;
#if defined(_DECAL0)
{
INIT_DECAL_PARAMS(decal, _Decal0_);
APPLY_DECAL_SEC00_GENERIC(i, albedo, normal_tangent, metallic, smoothness, decal);
#if defined(_DECAL0_SDF)
APPLY_DECAL_SEC01_SDF_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC01_SDF_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL0_TILING_MODE)
APPLY_DECAL_SEC02_CLAMP_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC02_CLAMP_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL0_MASK)
APPLY_DECAL_SEC03_MASK_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC03_MASK_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL0_REPLACE_ALPHA)
APPLY_DECAL_SEC04_BLEND_MODE_REPLACE(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC04_BLEND_MODE_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL0_NORMAL)
APPLY_DECAL_SEC05_NORMAL_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC05_NORMAL_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL0_REFLECTIONS)
APPLY_DECAL_SEC06_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC06_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
}
#endif // _DECAL0
#if defined(_DECAL1)
{
INIT_DECAL_PARAMS(decal, _Decal1_);
APPLY_DECAL_SEC00_GENERIC(i, albedo, normal_tangent, metallic, smoothness, decal);
#if defined(_DECAL1_SDF)
APPLY_DECAL_SEC01_SDF_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC01_SDF_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL1_TILING_MODE)
APPLY_DECAL_SEC02_CLAMP_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC02_CLAMP_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL1_MASK)
APPLY_DECAL_SEC03_MASK_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC03_MASK_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL1_REPLACE_ALPHA)
APPLY_DECAL_SEC04_BLEND_MODE_REPLACE(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC04_BLEND_MODE_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL1_NORMAL)
APPLY_DECAL_SEC05_NORMAL_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC05_NORMAL_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL1_REFLECTIONS)
APPLY_DECAL_SEC06_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC06_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
}
#endif // _DECAL1
#if defined(_DECAL2)
{
INIT_DECAL_PARAMS(decal, _Decal2_);
APPLY_DECAL_SEC00_GENERIC(i, albedo, normal_tangent, metallic, smoothness, decal);
#if defined(_DECAL2_SDF)
APPLY_DECAL_SEC01_SDF_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC01_SDF_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL2_TILING_MODE)
APPLY_DECAL_SEC02_CLAMP_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC02_CLAMP_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL2_MASK)
APPLY_DECAL_SEC03_MASK_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC03_MASK_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL2_REPLACE_ALPHA)
APPLY_DECAL_SEC04_BLEND_MODE_REPLACE(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC04_BLEND_MODE_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL2_NORMAL)
APPLY_DECAL_SEC05_NORMAL_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC05_NORMAL_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL2_REFLECTIONS)
APPLY_DECAL_SEC06_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC06_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
}
#endif // _DECAL2
#if defined(_DECAL3)
{
INIT_DECAL_PARAMS(decal, _Decal3_);
APPLY_DECAL_SEC00_GENERIC(i, albedo, normal_tangent, metallic, smoothness, decal);
#if defined(_DECAL3_SDF)
APPLY_DECAL_SEC01_SDF_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC01_SDF_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL3_TILING_MODE)
APPLY_DECAL_SEC02_CLAMP_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC02_CLAMP_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL3_MASK)
APPLY_DECAL_SEC03_MASK_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC03_MASK_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL3_REPLACE_ALPHA)
APPLY_DECAL_SEC04_BLEND_MODE_REPLACE(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC04_BLEND_MODE_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL3_NORMAL)
APPLY_DECAL_SEC05_NORMAL_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC05_NORMAL_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
#if defined(_DECAL3_REFLECTIONS)
APPLY_DECAL_SEC06_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, decal);
#else
APPLY_DECAL_SEC06_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, decal);
#endif
}
#endif // _DECAL3
}
#endif // __DECALS
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