well, i've got the hd5770 with catalys 10.8 (from the driver download section) and when carring the gl_extensions i could see that GL_arb_texture_buffer_object_rgb32 is missing. I'm creating an vertex shader to carry 3 components vertices and triangle indices, but since this extension is not supported i just can't make it, it still behave as an 4 components texture, even if i use GL_RGB32F/GL_RGB32UI in the texture buffer. As a matter of fact, the glsl builder give me an warning saying that this extension is not supported. I'm using GLEW 1.5.5 as for wrapping the openGL functions (i'm on windows vista 64bits os), and GLEW does have GL_ARB_texture_buffer_object_rgb32 but not the GL_EXT_texture_buffer_object_rgb32 which is present in the extention list of the card! There exist any way i can have either GL_ARB_texture_buffer_object_rgb32 or GL_EXT_texture_buffer_object_rgb32 enabled in my shader? Otherwise, i can't create my shader at all :/
thx for your attention and help.