mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Matthew Stanley
30 lines
1.1 KiB
C
30 lines
1.1 KiB
C
#ifndef PSX_WS_VIEW_ANCHOR_H
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#define PSX_WS_VIEW_ANCHOR_H
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/* Host presentation geometry. Camera bounds describe the native view's left
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* edge; the room's right edge is camera_max + native_width. */
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typedef struct WsViewAnchor {
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int left, right;
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int shift;
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int pad_left, pad_right;
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} WsViewAnchor;
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static inline WsViewAnchor ws_view_anchor(int extra, int camera,
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int camera_min, int camera_max) {
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WsViewAnchor v = {extra, extra, 0, 0, 0};
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if (extra <= 0 || camera_min > camera_max ||
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camera < camera_min || camera > camera_max) return v;
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int avail_left = camera - camera_min;
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int avail_right = camera_max - camera;
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int total = 2 * extra;
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v.left = avail_left < extra ? avail_left : extra;
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v.right = avail_right < total - v.left ? avail_right : total - v.left;
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v.left = avail_left < total - v.right ? avail_left : total - v.right;
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int padding = total - v.left - v.right;
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v.pad_left = padding / 2;
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v.pad_right = padding - v.pad_left;
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v.shift = v.left + v.pad_left - extra;
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return v;
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}
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#endif
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