Backdrop Path + Cybersteel (#23)

Co-authored-by: Zachary Levy <zachary@sunforge.is> Reviewed-on: #23
2026-05-01 05:43:10 +00:00
parent e36229a3ef
commit 5317b8f142
66 changed files with 5806 additions and 2427 deletions
@@ -0,0 +1,47 @@
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+struct Uniforms
+{
+    float2 inv_source_size;
+    uint downsample_factor;
+    uint _pad0;
+};
+
+struct main0_out
+{
+    float4 out_color [[color(0)]];
+};
+
+fragment main0_out main0(constant Uniforms& _18 [[buffer(0)]], texture2d<float> source_tex [[texture(0)]], sampler source_texSmplr [[sampler(0)]], float4 gl_FragCoord [[position]])
+{
+    main0_out out = {};
+    float2 src_block_center = gl_FragCoord.xy * float(_18.downsample_factor);
+    if (_18.downsample_factor == 1u)
+    {
+        float2 uv = src_block_center * _18.inv_source_size;
+        out.out_color = source_tex.sample(source_texSmplr, uv);
+    }
+    else
+    {
+        if (_18.downsample_factor == 2u)
+        {
+            float2 uv_1 = src_block_center * _18.inv_source_size;
+            out.out_color = source_tex.sample(source_texSmplr, uv_1);
+        }
+        else
+        {
+            float off = float(_18.downsample_factor) * 0.25;
+            float2 uv_tl = (src_block_center + float2(-off, -off)) * _18.inv_source_size;
+            float2 uv_tr = (src_block_center + float2(off, -off)) * _18.inv_source_size;
+            float2 uv_bl = (src_block_center + float2(-off, off)) * _18.inv_source_size;
+            float2 uv_br = (src_block_center + float2(off)) * _18.inv_source_size;
+            float4 c = ((source_tex.sample(source_texSmplr, uv_tl) + source_tex.sample(source_texSmplr, uv_tr)) + source_tex.sample(source_texSmplr, uv_bl)) + source_tex.sample(source_texSmplr, uv_br);
+            out.out_color = c * 0.25;
+        }
+    }
+    return out;
+}
+