this code works fine in legacy opengl 3.0, fails in forward compatible mode (4.1 , 3.3 on setup). i’ve tested on hardware , sofware implementations. use sdl opengl context, , glew find functions. adding line below code make problem.
sdl_gl_setattribute(sdl_gl_context_flags, sdl_gl_context_forward_compatible_flag); the problematic part of code call glvertexattribpointer
glbindbuffer(gl_array_buffer, glb.vbo); glbufferdata( gl_array_buffer, size * sizeof(glfloat), input, gl_dynamic_draw ); test_gl_errors(); /* gl_no_error */ gluseprogram(glb.program); glenablevertexattribarray(glb.vert_array); glenablevertexattribarray(glb.colour_array); /* use later. */ test_gl_errors(); /* gl_no_error */ glvertexattribpointer( glb.vert_array, 2, gl_float, gl_false, 5 * sizeof(glfloat), 0 ); test_gl_errors(); /* gl_invalid_operation */ i add more code, there lot of stuff. reading information link below didn’t me. suggestions?
https://www.opengl.org/sdk/docs/man/html/glvertexattribpointer.xhtml
my opengl setup:
- gallium 0.4 on amd cape verde (drm 2.45.0 / 4.7.2-1-ck, llvm 3.8.1)
- gallium 0.4 on llvmpipe (llvm 3.8, 128 bits)
- mesa3d: 12.0.1
the working code, based on comments reto koradi.
glbindvertexarray(gl_array_buffer, glb.vao); /* <-- new !!! */ glbindbuffer(gl_array_buffer, glb.vbo); glbufferdata( gl_array_buffer, size * sizeof(glfloat), input, gl_dynamic_draw ); gluseprogram(glb.program); glenablevertexattribarray(glb.vert_array); glvertexattribpointer( glb.vert_array, 2, gl_float, gl_false, 5 * sizeof(glfloat), 0 ); test_gl_errors(); /* gl_no_error */ 
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