init

shaders/sky_cols.comp

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+#version 450
+#extension GL_GOOGLE_include_directive : require
+layout(local_size_x = 64) in;
+#include "common.glsl"
+
+// The sky is visible in a window column above its first solid cell (static or powder); this finds that cell for every column (the sky buffer: words 64 ...).
+layout(std430, set = 0, binding = 44) buffer Sky { uint sky[]; };
+
+void main() {
+    int x = int(gl_GlobalInvocationID.x);
+    if (x >= pc.gw) return;
+    int top = pc.gh;
+    for (int y = 0; y < pc.gh; ++y) {
+        uint m = cell_mat(cells[y * pc.gw + x]);
+        if (m != 0u && (mflags(m) & (F_STATIC | F_SAND)) != 0u) { top = y; break; }
+    }
+    sky[64 + x] = uint(top);
+}