How to use bit operations in GLSL 1.3 with OpenGL 2.1 -



How to use bit operations in GLSL 1.3 with OpenGL 2.1 -

i'm trying write shader uses many bit operations. in fact supported since glsl 1.30, i'm on opengl 2.1.

is there way utilize bit operations opengl version?

all sm3 compatible (~opengl 2.1) hardware supports limited integer functionality. done emulating integers floats , not include bit operations.

for bit operations, need either glsl 1.3 or ext_gpu_shader4.

if reason have opengl 2.1 driver outdated, may lucky still have ext_gpu_shader4 (updating drivers might thought though, in case).

if reason graphics card not back upwards better, out of luck.

if have ext_gpu_shader4 (check extension string), can add:

#extension ext_gpu_shader4 : require

to glsl 1.2 shaders, , should work.

opengl glsl bitwise-operators

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