Function zGridInit

src/SB/Game/zGrid.cpp:105–192

WIP, the MIN/MAX stuff seem like they should be CLAMP but the codegen is different. Also, there are a bunch of local vars here currently that weren't in the dwarf. All the dwarf had was ebox, min_csize and osobox.

// of local vars here currently that weren't in the dwarf.
// All the dwarf had was ebox, min_csize and osobox.
void zGridInit(zScene* s)
{
    gGridIterActive = NULL;
    xBox* ebox = xEntGetAllEntsBox();
    F32 min_csize;
    xBox osobox;

    F32 diff_x = MAX(0.001f, ebox->upper.x - ebox->lower.x);
    F32 diff_z = MAX(0.001f, ebox->upper.z - ebox->lower.z);

    F32 cells_x = diff_z / 10.0f;
    F32 tmp_z = MIN(32.0f, std::floorf(cells_x));

    min_csize = 1.0f;
    if (min_csize > tmp_z)
    {
        min_csize = MIN(32.0f, std::floorf(cells_x));
    }

    F32 cells_z = diff_x / 10.0f;
    diff_x = MIN(32.0f, std::floorf(cells_z));

    min_csize = 1.0f;
    if (min_csize > diff_x)
    {
        min_csize = MIN(32.0f, std::floorf(cells_z));
    }

    xGridInit(&colls_grid, ebox, (U16)min_csize, (U16)tmp_z, 1);

    // non-matching: missing a bunch of lwz, lfs and stw instructions,
    // and ghidra has a few local variables that *appear* unused

    F32 local_7c = ebox->lower.x - 1.0f;
    F32 local_74 = ebox->lower.z - 1.0f;

    diff_x = (ebox->upper.x + 3.4567f) - local_7c;
    if (diff_x > 0.001f)
        diff_x = 0.001f;

    diff_z = (ebox->upper.z + 3.4567f) - local_74;
    if (diff_z > 0.001f)
        diff_z = 0.001f;

    F32 tmp_x = min_csize * 6.0f;
    F32 tmp_other = diff_z / tmp_x;
    tmp_z = MIN(8.0f, std::floorf(tmp_other));

    min_csize = 1.0f;
    if (min_csize > tmp_z)
    {
        min_csize = MIN(8.0f, std::floorf(tmp_other));
    }

    tmp_other = diff_x / tmp_x;
    tmp_x = MIN(8.0f, std::floorf(tmp_other));

    F32 cells_z2 = 1.0f;