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Register.lua: Throw error if node 'light_source' > core.LIGHT_MAX

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Add 'core.LIGHT_MAX = 14' to builtin/game/constants.lua with the intention
to replace misplaced 'default.LIGHT_MAX = 14' in Minetest Game.
Add comment in light.h requiring the constant be changed in both places.
Add lighting bug warning to note in lua_api.txt.
There are hundreds of mod uses of 15 which causes a lighting bug.
This commit is contained in:
paramat 2016-09-15 22:40:19 +01:00
parent 297546af3d
commit 3aefa5d3ce
4 changed files with 16 additions and 3 deletions
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6
src/light.h
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@ -27,8 +27,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
*/
// This directly sets the range of light.
// Actually this is not the real maximum, and this is not the
// brightest. The brightest is LIGHT_SUN.
// Actually this is not the real maximum, and this is not the brightest, the
// brightest is LIGHT_SUN.
// If changed, this constant as defined in builtin/game/constants.lua must
// also be changed.
#define LIGHT_MAX 14
// Light is stored as 4 bits, thus 15 is the maximum.
// This brightness is reserved for sunlight