40 lines
1.4 KiB
Text
40 lines
1.4 KiB
Text
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#version 460
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#extension GL_EXT_buffer_reference : enable
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#extension GL_EXT_scalar_block_layout : enable
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// Issue #37: GPU-resident procedural AABBs. This compute shader is the
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// "producer" — it writes the per-box bounding boxes straight into a device
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// buffer that Mesh::BuildProcedural / RefitProcedural then consume by device
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// address, with no host copy. Here it emits a single unit box [-1,1]^3 (the
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// bounding volume the intersection shader turns into a sphere); `time` lets
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// the box breathe so a per-frame refit has something to track. A real
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// particle system would write one box per particle from simulation state.
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//
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// The buffer is reached via a buffer_reference (its device address pushed in
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// `pc`), so this dispatch needs no descriptor-heap binding for the output.
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layout(buffer_reference, scalar) buffer AabbRef {
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float data[]; // 6 floats per box: min.xyz, max.xyz (RTAabb layout)
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};
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layout(push_constant) uniform PC {
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AabbRef boxes;
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uint count;
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float time;
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} pc;
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layout(local_size_x = 64) in;
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void main() {
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uint i = gl_GlobalInvocationID.x;
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if (i >= pc.count) return;
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float r = 1.0 + 0.15 * sin(pc.time); // gently pulsing radius
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uint b = i * 6u;
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pc.boxes.data[b + 0u] = -r;
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pc.boxes.data[b + 1u] = -r;
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pc.boxes.data[b + 2u] = -r;
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pc.boxes.data[b + 3u] = r;
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pc.boxes.data[b + 4u] = r;
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pc.boxes.data[b + 5u] = r;
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}
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