diff options
| author | yum <yum.food.vr@gmail.com> | 2025-11-30 16:59:17 -0800 |
|---|---|---|
| committer | yum <yum.food.vr@gmail.com> | 2025-11-30 16:59:17 -0800 |
| commit | 4ea532113a421501145481fe11b798b358cce6d1 (patch) | |
| tree | 7282be7908115ece8a05338f257b8deaa60b2fcd | |
| parent | 91d811eef69146248c4fbacda64f4eb206b90468 (diff) | |
move sdf code into function
| -rw-r--r-- | decals.cginc | 48 |
1 files changed, 26 insertions, 22 deletions
diff --git a/decals.cginc b/decals.cginc index 694e48d..4161b2c 100644 --- a/decals.cginc +++ b/decals.cginc @@ -156,6 +156,31 @@ float4 getCmykWarpingPlanesColor(DecalParams params, float2 uv) { return float4(final_rgb, saturate(decal_color0.a + decal_color1.a + decal_color2.a + decal_color3.a));
}
+// Calculate normal vector from an SDF using screen-space derivatives.
+float3 applyDecalSdfSsn(DecalParams params, float2 decal_uv, float4 decal_albedo) {
+ float sdf_val = params.mainTex.SampleBias(trilinear_aniso4_repeat_s, decal_uv, params.mip_bias).r;
+ sdf_val = params.sdf_invert ? 1 - sdf_val : sdf_val;
+
+ float sdf_dx = ddx(sdf_val);
+ float sdf_dy = ddy(sdf_val);
+
+ float2 uv_dx = ddx(decal_uv);
+ float2 uv_dy = ddy(decal_uv);
+
+ float det = uv_dx.x * uv_dy.y - uv_dx.y * uv_dy.x;
+ float2 sdf_grad_uv;
+ if (abs(det) < 1e-6) {
+ sdf_grad_uv = float2(0,0);
+ } else {
+ sdf_grad_uv.x = (sdf_dx * uv_dy.y - sdf_dy * uv_dx.y) / det;
+ sdf_grad_uv.y = (sdf_dy * uv_dx.x - sdf_dx * uv_dy.x) / det;
+ }
+
+ float2 scaled_grad = sdf_grad_uv * params.sdf_ssn_strength * decal_albedo.a * params.opacity;
+
+ return normalize(float3(-scaled_grad.xy, 1.0));
+}
+
#define APPLY_DECAL_GENERIC(i, albedo, normal_tangent, metallic, smoothness, emission, params) \
float2x2 decal_rot = float2x2( \
cos(params.angle * TAU), -sin(params.angle * TAU), \
@@ -242,28 +267,7 @@ float4 getCmykWarpingPlanesColor(DecalParams params, float2 uv) { #define APPLY_DECAL_SDF_SSN_ON(i, albedo, normal_tangent, metallic, smoothness, emission, params) \
{ \
- float sdf_val = params.mainTex.SampleBias(trilinear_aniso4_repeat_s, decal_uv, params.mip_bias).r; \
- sdf_val = params.sdf_invert ? 1 - sdf_val : sdf_val; \
- \
- float sdf_dx = ddx(sdf_val); \
- float sdf_dy = ddy(sdf_val); \
- \
- float2 uv_dx = ddx(decal_uv); \
- float2 uv_dy = ddy(decal_uv); \
- \
- float det = uv_dx.x * uv_dy.y - uv_dx.y * uv_dy.x; \
- float2 sdf_grad_uv; \
- if (abs(det) < 1e-6) { \
- sdf_grad_uv = float2(0,0); \
- } else { \
- sdf_grad_uv.x = (sdf_dx * uv_dy.y - sdf_dy * uv_dx.y) / det; \
- sdf_grad_uv.y = (sdf_dy * uv_dx.x - sdf_dx * uv_dy.x) / det; \
- } \
- \
- float2 scaled_grad = sdf_grad_uv * params.sdf_ssn_strength * decal_albedo.a * params.opacity; \
- \
- float3 sdf_normal_ts = normalize(float3(-scaled_grad.xy, 1.0)); \
- \
+ float3 sdf_normal_ts = applyDecalSdfSsn(params, decal_uv, decal_albedo); \
normal_tangent = blendNormalsHill12(normal_tangent, sdf_normal_ts); \
}
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