Add decal slot

6 files changed, 109 insertions, 0 deletions

diff --git a/3ner.cginc b/3ner.cginc
index 8ddbce8..ea5ccfb 100755
--- a/3ner.cginc
+++ b/3ner.cginc
@@ -10,6 +10,7 @@
 
 #include "brdf.cginc"
 #include "cnlohr.cginc"
+#include "decal.cginc"
 #include "geometry.cginc"
 #include "pbr.cginc"
 #include "lighting.cginc"
@@ -301,6 +302,7 @@ float4 frag(v2f i, uint facing : SV_IsFrontFace
   i.normal *= facing ? 1 : -1;
 
   Pbr pbr = getPbr(i);
+  applyDecals(i, pbr);
 
 #if defined(_DEBUG_VIEW_UNLIT)
   return pbr.albedo;
diff --git a/3ner.shader b/3ner.shader
index 476a7f4..8cbbd09 100755
--- a/3ner.shader
+++ b/3ner.shader
@@ -65,6 +65,27 @@ Shader "yum_food/3ner"
         [HideInInspector] m_end_Ambient_Occlusion("Ambient Occlusion", Float) = 0
         //endex
 
+        [HideInInspector] m_start_Matcaps("Decals", Float) = 0
+          //ifex _Decal0_Enabled==0
+          [HideInInspector] m_start_Decal0("Decal 0", Float) = 0
+            [ThryToggle(_DECAL0)] _Decal0_Enabled("Enable", Float) = 0
+            _Decal0_MainTex("Base color", 2D) = "white" {}
+            _Decal0_Color("Tint", Color) = (1, 1, 1, 1)
+            _Decal0_Opacity("Opacity", Range(0, 1)) = 1
+            [ThryWideEnum(Repeat, 0, Mirror, 1, Clamp, 2)] _Decal0_UV_Mode("UV Mode", Int) = 0
+            [ThryWideEnum(AlphaBlend, 0, Multiply, 1)] _Decal0_Mix_Mode("Mix Mode", Int) = 0
+            [IntRange] _Decal0_UV_Channel("UV Channel", Range(0, 3)) = 0
+
+            //ifex _Decal0_Rotation_Enabled==0
+            [HideInInspector] m_start_Decal0_Rotation("Rotation", Float) = 0
+              [ThryToggle(_DECAL0_ROTATION)] _Decal0_Rotation_Enabled("Enable", Float) = 0
+              _Decal0_Rotation("Rotation", Range(-0.5, 0.5)) = 0
+            [HideInInspector] m_end_Decal0_Rotation("Rotation", Float) = 0
+            //endex
+          [HideInInspector] m_end_Decal0("Decal 0", Float) = 0
+          //endex
+        [HideInInspector] m_end_Decals("Decals", Float) = 0
+
         [HideInInspector] m_start_Matcaps("Matcaps", Float) = 0
           //ifex _Matcap0_Enabled==0
           [HideInInspector] m_start_Matcap0("Matcap 0", Float) = 0
diff --git a/decal.cginc b/decal.cginc
new file mode 100644
index 0000000..69fb9e5
--- /dev/null
+++ b/decal.cginc
@@ -0,0 +1,55 @@
+#ifndef __DECAL_INC
+#define __DECAL_INC
+
+#include "globals.cginc"
+#include "pbr.cginc"
+#include "interpolators.cginc"
+#include "texture_utils.cginc"
+
+float4 decal_sample(texture2D tex, float2 uv, int uv_mode) {
+  [forcecase]
+  switch (uv_mode) {
+    case DECAL_UV_MODE_REPEAT:
+      return tex.Sample(aniso4_trilinear_repeat_s, uv);
+    case DECAL_UV_MODE_MIRROR:
+      return tex.Sample(aniso4_trilinear_mirror_s, uv);
+    case DECAL_UV_MODE_CLAMP:
+      return tex.Sample(aniso4_trilinear_clamp_s, uv);
+    default:
+      return 0;
+  }
+}
+
+float2 decal_rotate(float2 uv, float rotation) {
+  float s, c;
+  sincos(rotation * TAU, s, c);
+  float2 d = uv - 0.5;
+  return float2(d.x * c - d.y * s, d.x * s + d.y * c) + 0.5;
+}
+
+void applyDecals(v2f i, inout Pbr pbr) {
+#if defined(_DECAL0)
+  {
+    float2 uv = get_uv_by_channel(i, _Decal0_UV_Channel);
+    uv -= _Decal0_MainTex_ST.zw;
+    uv *= _Decal0_MainTex_ST.xy;
+#if defined(_DECAL0_ROTATION)
+    uv = decal_rotate(uv, _Decal0_Rotation);
+#endif
+    float4 albedo = decal_sample(_Decal0_MainTex, uv, _Decal0_UV_Mode);
+    albedo *= _Decal0_Color;
+    albedo.a *= _Decal0_Opacity;
+    [forcecase]
+    switch (_Decal0_Mix_Mode) {
+      case DECAL_MIX_MODE_ALPHA_BLEND:
+        pbr.albedo = alpha_blend(albedo, pbr.albedo);
+        break;
+      case DECAL_MIX_MODE_MULTIPLY:
+        pbr.albedo.rgb *= lerp(1, albedo.rgb, albedo.a);
+        break;
+    }
+  }
+#endif
+}
+
+#endif  // __DECAL_INC
diff --git a/features.cginc b/features.cginc
index 2919950..8107e94 100755
--- a/features.cginc
+++ b/features.cginc
@@ -158,6 +158,11 @@
 #pragma shader_feature_local _RAY_MARCHING_HEXAGON
 //endex
 
+//ifex _Decal0_Enabled==0
+#pragma shader_feature_local _DECAL0
+#pragma shader_feature_local _DECAL0_ROTATION
+//endex
+
 //ifex _Matcap0_Enabled==0
 #pragma shader_feature_local _MATCAP0
 #pragma shader_feature_local _MATCAP0_QUANTIZATION
diff --git a/globals.cginc b/globals.cginc
index 2f4dc1e..df9552e 100755
--- a/globals.cginc
+++ b/globals.cginc
@@ -6,6 +6,8 @@
 SamplerState point_repeat_s;
 SamplerState linear_repeat_s;
 SamplerState aniso4_trilinear_repeat_s;
+SamplerState aniso4_trilinear_mirror_s;
+SamplerState aniso4_trilinear_clamp_s;
 SamplerState bilinear_repeat_s;
 SamplerState linear_clamp_s;
 SamplerState bilinear_clamp_s;
@@ -239,6 +241,26 @@ float _Parallax_Heightmap_Bias;
 float _Parallax_Heightmap_Ray_Marching_Steps;
 #endif  // _PARALLAX_HEIGHTMAP_RAY_MARCHING
 
+#define DECAL_UV_MODE_REPEAT     0
+#define DECAL_UV_MODE_MIRROR     1
+#define DECAL_UV_MODE_CLAMP      2
+
+#define DECAL_MIX_MODE_ALPHA_BLEND 0
+#define DECAL_MIX_MODE_MULTIPLY    1
+
+#if defined(_DECAL0)
+float4 _Decal0_Color;
+texture2D _Decal0_MainTex;
+float4 _Decal0_MainTex_ST;
+float _Decal0_Opacity;
+int _Decal0_UV_Mode;
+int _Decal0_UV_Channel;
+int _Decal0_Mix_Mode;
+#if defined(_DECAL0_ROTATION)
+float _Decal0_Rotation;
+#endif  // _DECAL0_ROTATION
+#endif  // _DECAL0
+
 #define MATCAP_MODE_REPLACE     0
 #define MATCAP_MODE_ADD         1
 #define MATCAP_MODE_MULTIPLY    2
diff --git a/math.cginc b/math.cginc
index e2d4169..5becd0e 100755
--- a/math.cginc
+++ b/math.cginc
@@ -105,5 +105,9 @@ float luminance(float3 rgb) {
   return dot(float3(0.2126, 0.7152, 0.0722), rgb);
 }
 
+float4 alpha_blend(float4 src, float4 dst) {
+  return float4(src.rgb * src.a + dst.rgb * (1 - src.a), src.a + dst.a * (1 - src.a));
+}
+
 #endif  // __MATH_INC