Fast sqrt functions ambiguity

[rwypior]

Hello.

I encountered difficulties using fast sqrt functions (GLM_GTX_fast_square_root extension).
The problem is ambiguity between the functions, that only differ in returning type, which (the returning type) is genType or genType::value_type.

The example:

glm::mediump_float32 dist = glm::fastDistance(glm::mediump_f32vec2(destination.x, destination.z), glm::mediump_f32vec2(loc.x, loc.z));

Above line generates error:

more than one instance of overloaded function "glm::fastDistance" matches the argument list:
function template "genType::value_type glm::fastDistance(const genType &x, const genType &y)"
function template "genType glm::fastDistance(const genType &x, const genType &y)"
argument types are: (glm::mediump_f32vec2, glm::mediump_f32vec2)

I believe it is a GLM bug. Is there any known workaround solution for this?

[Groovounet]

Hi,

With GLM 0.9.5, if you use glm::lowp_float32 dist = glm::distance(glm::lowp_f32vec2(destination.x, destination.z), glm::lowp_f32vec2(loc.x, loc.z)); you will access the same fast path.

glm::fastDistance should probably be fixed as well.

Thanks,
Christophe

[rwypior]

It's good to know.

Thank you for help!

[Groovounet]

This issue is fixed in GLM 0.9.5 branch and for GLM 0.9.5.4 release.

Thanks for contributing,
Christophe