heaps

More flexible rules to compare texts with previous references

Prevent driver crash using compressed textures with dimensions not divisible by 4 because of MIPMAP_MAX_SIZE parameter.

Revert normalize when reading normals as artifacts are only visible on perfect planes and the fix introduced NaN on some drivers.

Normalize normals after reading.

Compile define -D heaps_no_error_trap to suppress trapping exceptions… (#1121)