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multi-touch demo: if an index 64 would come in, this would be written in the wrong place in the cursor buffer. Supporting 64 IDs means writing to slots 0--63

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This commit is contained in:
Diederick C. Niehorster 2017-06-05 20:50:44 +02:00
parent f04be0c4f2
commit bef94a71b1
1 changed files with 4 additions and 4 deletions
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8
freeglut/freeglut/progs/demos/multi-touch/multi-touch.c
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@ -109,8 +109,8 @@ void onMotion(int x, int y) {
/* Using FG2.8 (reversed) prototype for now */ /* Using FG2.8 (reversed) prototype for now */
/* void onMultiButton(int cursor_id, int button, int state, int x, int y) { */ /* void onMultiButton(int cursor_id, int button, int state, int x, int y) { */
void onMultiButton(int cursor_id, int x, int y, int button, int state) { void onMultiButton(int cursor_id, int x, int y, int button, int state) {
if (cursor_id > NUM_CURSORS) { if (cursor_id >= NUM_CURSORS) {
fprintf(stderr, "cursor_id (%d) > NUM_CURSORS (%d)\n", cursor_id, NUM_CURSORS); fprintf(stderr, "cursor_id (%d) >= NUM_CURSORS (%d), out of slots\n", cursor_id, NUM_CURSORS);
return; return;
} }
if (button == 0) { if (button == 0) {
@ -122,8 +122,8 @@ void onMultiButton(int cursor_id, int x, int y, int button, int state) {
} }
void onMultiMotion(int cursor_id, int x, int y) { void onMultiMotion(int cursor_id, int x, int y) {
if (cursor_id > NUM_CURSORS) { if (cursor_id >= NUM_CURSORS) {
fprintf(stderr, "cursor_id (%d) > NUM_CURSORS (%d)\n", cursor_id, NUM_CURSORS); fprintf(stderr, "cursor_id (%d) >= NUM_CURSORS (%d), out of slots\n", cursor_id, NUM_CURSORS);
return; return;
} }
cursors[0][cursor_id].x = (float)x; cursors[0][cursor_id].x = (float)x;