[Qt-interest] View JPEG in QGLWidget

[Constantin Makshin]

Video cards that support NPOT textures with regular addressing scheme (i.e. with texture coordinates lying in range 0...1) must have "GL_ARB_texture_non_power_of_two" in the list of supported OpenGL extensions. Your card doesn't have that extension, so invalid texture size is likely to be the cause.

However, your card supports the "GL_ARB_texture_rectangle" extension which allows using NPOT textures, but in a bit different way. Take a look at the extension documentation at
http://www.opengl.org/registry/specs/ARB/texture_rectangle.txt
for more detailed information.

On Wednesday, July 27, 2011 09:36:16 AM Brilliantov Kirill Vladimirovich wrote:
> Hello Constantin and thank you for your reply!
> 
> 1. How can I check video card capabilities?
> $ glxinfo
> name of display: :0.0
> display: :0  screen: 0
> direct rendering: Yes
> server glx vendor string: NVIDIA Corporation
> server glx version string: 1.4
> server glx extensions:
>      GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
>      GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
>      GLX_EXT_texture_from_pixmap, GLX_ARB_multisample, GLX_NV_float_buffer
> client glx vendor string: NVIDIA Corporation
> client glx version string: 1.4
> client glx extensions:
>      GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_visual_info,
>      GLX_EXT_visual_rating, GLX_EXT_import_context, GLX_SGI_video_sync,
>      GLX_NV_swap_group, GLX_NV_video_out, GLX_SGIX_fbconfig, 
> GLX_SGIX_pbuffer,
>      GLX_SGI_swap_control, GLX_NV_float_buffer, GLX_ARB_fbconfig_float,
>      GLX_EXT_fbconfig_packed_float, GLX_EXT_texture_from_pixmap,
>      GLX_EXT_framebuffer_sRGB, GLX_NV_present_video
> GLX version: 1.3
> GLX extensions:
>      GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
>      GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
>      GLX_EXT_texture_from_pixmap, GLX_ARB_multisample, GLX_NV_float_buffer,
>      GLX_ARB_get_proc_address
> OpenGL vendor string: NVIDIA Corporation
> OpenGL renderer string: GeForce FX 5500/AGP/SSE2
> OpenGL version string: 2.1.2 NVIDIA 173.14.27
> OpenGL shading language version string: 1.20 NVIDIA via Cg compiler
> OpenGL extensions:
> GL_ARB_depth_texture, GL_ARB_fragment_program,
>      GL_ARB_fragment_program_shadow, GL_ARB_fragment_shader,
>      GL_ARB_half_float_pixel, 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_compression,
>      GL_ARB_texture_cube_map, GL_ARB_texture_env_add,
>      GL_ARB_texture_env_combine, GL_ARB_texture_env_dot3,
>      GL_ARB_texture_mirrored_repeat, GL_ARB_texture_rectangle,
>      GL_ARB_transpose_matrix, GL_ARB_vertex_buffer_object,
>      GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ARB_window_pos,
>      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_compiled_vertex_array, GL_EXT_Cg_shader,
>      GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit,
>      GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_object,
>      GL_EXT_gpu_program_parameters, GL_EXT_multi_draw_arrays,
>      GL_EXT_packed_depth_stencil, GL_EXT_packed_pixels,
>      GL_EXT_paletted_texture, 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_shared_texture_palette, GL_EXT_stencil_two_side,
>      GL_EXT_stencil_wrap, GL_EXT_texture3D, 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_object, GL_EXT_texture_sRGB,
>      GL_EXT_timer_query, GL_EXT_vertex_array, 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_fence,
>      GL_NV_float_buffer, GL_NV_fog_distance, GL_NV_fragment_program,
>      GL_NV_fragment_program_option, GL_NV_framebuffer_multisample_coverage,
>      GL_NV_half_float, GL_NV_light_max_exponent, 
> GL_NV_multisample_filter_hint,
>      GL_NV_occlusion_query, GL_NV_packed_depth_stencil, 
> 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_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_SGIS_generate_mipmap,
>      GL_SGIS_texture_lod, GL_SGIX_depth_texture, GL_SGIX_shadow,
>      GL_SUN_slice_accum
> 
> qDebug() << "OpenGL version" << (char *)glGetString(GL_VERSION) output:
> OpenGL version 2.1.2 NVIDIA 173.14.27
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