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Fix integer underflow when rounding up in VoxelGI 

The code wanted to divide and round up:
 - 0 / 64 = 0
 - 63 / 64 = 1
 - 64 / 64 = 1
 - 65 / 64 = 2

However when the dividend was exactly 0 it would underflow and produce
67108864 instead.

This caused TDRs on empty scenes or extremely slow performance

Fix #80286

(cherry picked from commit e783e32108)
This commit is contained in:
Matias N. Goldberg 2023-08-06 23:21:58 -03:00 committed by Yuri Sizov
parent a90aac5415
commit efbe9237cc
1 changed files with 2 additions and 2 deletions
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4
servers/rendering/renderer_rd/environment/gi.cpp
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@ -2966,7 +2966,7 @@ void GI::VoxelGIInstance::update(bool p_update_light_instances, const Vector<RID
push_constant.cell_offset = mipmaps[i].cell_offset;
push_constant.cell_count = mipmaps[i].cell_count;
int64_t wg_todo = (mipmaps[i].cell_count - 1) / wg_size + 1;
int64_t wg_todo = (mipmaps[i].cell_count + wg_size - 1) / wg_size;
while (wg_todo) {
int64_t wg_count = MIN(wg_todo, wg_limit_x);
RD::get_singleton()->compute_list_set_push_constant(compute_list, &push_constant, sizeof(VoxelGIPushConstant));
@ -2987,7 +2987,7 @@ void GI::VoxelGIInstance::update(bool p_update_light_instances, const Vector<RID
push_constant.cell_offset = mipmaps[i].cell_offset;
push_constant.cell_count = mipmaps[i].cell_count;
int64_t wg_todo = (mipmaps[i].cell_count - 1) / wg_size + 1;
int64_t wg_todo = (mipmaps[i].cell_count + wg_size - 1) / wg_size;
while (wg_todo) {
int64_t wg_count = MIN(wg_todo, wg_limit_x);
RD::get_singleton()->compute_list_set_push_constant(compute_list, &push_constant, sizeof(VoxelGIPushConstant));