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gpu: panic on z-buffer overflow

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Drawing more than 65k objects is reasonable, but not today.

Updates gio#127

Signed-off-by: Elias Naur <mail@eliasnaur.com>
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Elias Naur
2020-06-08 15:51:29 +02:00
parent 700d8d8c2c
commit 52864950f1
1 changed files with 4 additions and 0 deletions
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gpu/gpu.go
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@@ -750,6 +750,10 @@ loop:
continue continue
} }
state.z++ state.z++
if state.z != int(uint16(state.z)) {
// TODO(eliasnaur) gioui.org/issue/127.
panic("more than 65k paint objects not supported")
}
// Assume 16-bit depth buffer. // Assume 16-bit depth buffer.
const zdepth = 1 << 16 const zdepth = 1 << 16
// Convert z to window-space, assuming depth range [0;1]. // Convert z to window-space, assuming depth range [0;1].