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James_Bond
11-04-2009, 01:36 AM
Hi all.
I'm kinda stuck on this issue. I'm using VNC for remote access. In order to have a good OpenGL rendering I'm doing remote rendering using a pbuffer which "recieve" the OpenGL calls and then send back the result. Almost everything works except the shaders and I don't know why. Could that be the attributes used to configure the pbuffer? Something else?
Thanks in advance.

ZbuffeR
11-04-2009, 03:23 AM
For true hardware accelereated remote rendering you should use VirtualGL :
http://www.virtualgl.org/About/Introduction

James_Bond
11-04-2009, 03:27 AM
I've taken a look to it. But my remote rendering system is already integrated in the framework we developed. It works but without the shaders. So I don't think it's relevant (yet?) to use/integrate a third party solution as it seems something's missing.

ZbuffeR
11-04-2009, 04:41 AM
Then you will have to be more specific besides "everything works except the shaders".
Error messages, glGetError() ? Compile, link steps works ?
What do you mean by pbuffer ? The obsolete windows pbuffers or FBO ? Something else ?
What is the list of GL extensions available at runtime within your program ?
Can you describe how works the framework you developed ?
More details about your hardware/OS platform setup ?

James_Bond
11-05-2009, 12:03 AM
Error messages, glGetError() ? Compile, link steps works ?
Everything's fine.



What do you mean by pbuffer ? The obsolete windows pbuffers or FBO ? Something else ?
GLXPBuffer (FBO is for the next version).



What is the list of GL extensions available at runtime within your program ?
local context extensions (used to detect the availability of pbuffer):

GL_ARB_color_buffer_float GL_ARB_depth_texture GL_ARB_draw_buffers GL_ARB_draw_instanced GL_ARB_fragment_program GL_ARB_fragment_program_shadow
GL_ARB_fragment_shader GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_framebuffer_object GL_ARB_geometry_shader4 GL_ARB_imaging GL_ARB_multisample
GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_shadow GL_ARB_shader_objects
GL_ARB_shading_language_100 GL_ARB_texture_border_clamp GL_ARB_texture_buffer_object GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add
GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_texture_rectangle
GL_ARB_transpose_matrix GL_ARB_vertex_array_object GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_ATI_draw_buffers
GL_ATI_texture_float GL_ATI_texture_mirror_once GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_equation_separate
GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_Cg_shader GL_EXT_bindable_uniform GL_EXT_depth_bounds_test
GL_EXT_direct_state_access GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit
GL_EXT_framebuffer_multisample GL_EXT_framebuffer_object GL_EXTX_framebuffer_mixed_formats GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4
GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_packed_pixels
GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs
GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture3D GL_EXT_texture_array GL_EXT_texture_buffer_object GL_EXT_texture_compression_latc
GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine
GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp
GL_EXT_texture_object GL_EXT_texture_sRGB GL_EXT_texture_shared_exponent GL_EXT_timer_query GL_EXT_vertex_array GL_EXT_vertex_array_bgra
GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_KTX_buffer_region GL_NV_blend_square GL_NV_copy_depth_to_color GL_NV_depth_buffer_float
GL_NV_conditional_render GL_NV_depth_clamp GL_NV_explicit_multisample GL_NV_fence GL_NV_float_buffer GL_NV_fog_distance GL_NV_fragment_program
GL_NV_fragment_program_option GL_NV_fragment_program2 GL_NV_framebuffer_multisample_coverage GL_NV_geometry_shader4 GL_NV_gpu_program4 GL_NV_half_float
GL_NV_light_max_exponent GL_NV_multisample_coverage GL_NV_multisample_filter_hint GL_NV_occlusion_query GL_NV_packed_depth_stencil GL_NV_parameter_buffer_object
GL_NV_pixel_data_range GL_NV_point_sprite GL_NV_primitive_restart GL_NV_register_combiners GL_NV_register_combiners2 GL_NV_texgen_reflection
GL_NV_texture_compression_vtc GL_NV_texture_env_combine4 GL_NV_texture_expand_normal GL_NV_texture_rectangle GL_NV_texture_shader GL_NV_texture_shader2
GL_NV_texture_shader3 GL_NV_transform_feedback GL_NV_vertex_array_range GL_NV_vertex_array_range2 GL_NV_vertex_program GL_NV_vertex_program1_1 GL_NV_vertex_program2
GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_NVX_conditional_render GL_SGIS_generate_mipmap GL_SGIS_texture_lod GL_SGIX_depth_texture GL_SGIX_shadow
GL_SUN_slice_accum


pbuffer context extensions:

GL_ARB_color_buffer_float GL_ARB_depth_texture GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_half_float_pixel GL_ARB_half_float_vertex
GL_ARB_framebuffer_object GL_ARB_imaging GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite
GL_ARB_shadow GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine
GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_texture_rectangle GL_ARB_vertex_array_object
GL_ARB_vertex_program GL_ARB_window_pos GL_ATI_texture_float GL_ATI_texture_mirror_once GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color
GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_object
GL_EXTX_framebuffer_mixed_formats GL_EXT_framebuffer_sRGB GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_packed_pixels
GL_EXT_pixel_buffer_object GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_EXT_texture3D
GL_EXT_texture_array GL_EXT_texture_compression_latc GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map
GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod GL_EXT_texture_lod_bias
GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_sRGB GL_EXT_texture_shared_exponent GL_EXT_timer_query GL_EXT_vertex_array
GL_EXT_vertex_array_bgra GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_KTX_buffer_region GL_NV_blend_square GL_NV_copy_depth_to_color
GL_NV_depth_clamp GL_NV_float_buffer GL_NV_fog_distance GL_NV_fragment_program_option GL_NV_fragment_program2 GL_NV_geometry_shader4 GL_NV_light_max_exponent
GL_NV_multisample_coverage GL_NV_multisample_filter_hint GL_NV_packed_depth_stencil GL_NV_texgen_reflection GL_NV_texture_compression_vtc
GL_NV_texture_env_combine4 GL_NV_texture_expand_normal GL_NV_texture_rectangle GL_NV_texture_shader GL_NV_texture_shader2 GL_NV_texture_shader3
GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_SGIS_generate_mipmap GL_SGIS_texture_lod GL_SGIX_depth_texture GL_SGIX_shadow GL_SUN_slice_accum




Can you describe how works the framework you developed?
It's based on OpenInventor by SGI.



More details about your hardware/OS platform setup ?
Core 2 duo on RHEL 4 x86_64

James_Bond
11-05-2009, 02:13 AM
I found the problem. It had nothing to do with the pbuffer itself. I was creating the context of the pbuffer with a shared one which didn't have the shaders extensions.
My bad.