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gobj: support clearing half-float textures

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Fixes #374
This commit is contained in:
rdb 2018-09-02 10:58:02 +02:00
parent c670cd45d9
commit 3495537bf9
1 changed files with 15 additions and 0 deletions
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15
panda/src/gobj/texture.cxx
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@ -5678,6 +5678,21 @@ do_get_clear_data(const CData *cdata, unsigned char *into) const {
break;
}
case T_half_float:
for (int i = 0; i < num_components; ++i) {
union {
uint32_t ui;
float uf;
} v;
v.uf = clear_value[i];
uint16_t sign = ((v.ui & 0x80000000u) >> 16u);
uint32_t mantissa = (v.ui & 0x007fffffu);
uint16_t exponent = (uint16_t)std::min(std::max((int)((v.ui & 0x7f800000u) >> 23u) - 112, 0), 31);
mantissa += (mantissa & 0x00001000u) << 1u;
((uint16_t *)into)[i] = (uint16_t)(sign | ((exponent << 10u) | (mantissa >> 13u)));
}
break;
case T_unsigned_int:
// Note: there are no 32-bit UNORM textures. Therefore, we don't do any
// normalization here, either.