[vtkusers] Bug in font rendering if shadow == true ?
Antoine Rosset
rossetantoine at bluewin.ch
Sun Apr 6 12:33:21 EDT 2008
It's a vtkTextActor, using the vtkOpenGLFreeTypeTextMapper.
It's not related to the OpenGL extensions in my opinion, but it's
related to the creation of this RGBA texture, before sending it to the
OpenGL pipeline.
Here are the OpenGL extensions:
ATI Radeon X1900 OpenGL Engine
Vendor Name ATI Technologies Inc.
Version 2.0 ATI-1.5.24
GL Shading Language Version 1.20
Renderer Name ATI Radeon X1900 OpenGL Engine
OpenGL Extensions
GL_APPLE_aux_depth_stencil
GL_APPLE_client_storage
GL_APPLE_element_array
GL_APPLE_fence
GL_APPLE_float_pixels
GL_APPLE_flush_buffer_range
GL_APPLE_flush_render
GL_APPLE_object_purgeable
GL_APPLE_packed_pixels
GL_APPLE_pixel_buffer
GL_APPLE_specular_vector
GL_APPLE_texture_range
GL_APPLE_transform_hint
GL_APPLE_vertex_array_object
GL_APPLE_vertex_array_range
GL_APPLE_vertex_program_evaluators
GL_APPLE_ycbcr_422
GL_ARB_depth_texture
GL_ARB_draw_buffers
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_shader_objects
GL_ARB_shader_texture_lod
GL_ARB_shading_language_100
GL_ARB_shadow
GL_ARB_shadow_ambient
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_crossbar
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_blend
GL_ARB_vertex_buffer_object
GL_ARB_vertex_program
GL_ARB_vertex_shader
GL_ARB_window_pos
GL_ATI_blend_equation_separate
GL_ATI_blend_weighted_minmax
GL_ATI_separate_stencil
GL_ATI_text_fragment_shader
GL_ATI_texture_compression_3dc
GL_ATI_texture_env_combine3
GL_ATI_texture_float
GL_ATI_texture_mirror_once
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_clip_volume_hint
GL_EXT_compiled_vertex_array
GL_EXT_draw_range_elements
GL_EXT_fog_coord
GL_EXT_framebuffer_blit
GL_EXT_framebuffer_multisample
GL_EXT_framebuffer_object
GL_EXT_geometry_shader4
GL_EXT_gpu_program_parameters
GL_EXT_multi_draw_arrays
GL_EXT_packed_depth_stencil
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_texture_compression_dxt1
GL_EXT_texture_compression_s3tc
GL_EXT_texture_env_add
GL_EXT_texture_filter_anisotropic
GL_EXT_texture_lod_bias
GL_EXT_texture_mirror_clamp
GL_EXT_texture_rectangle
GL_EXT_texture_sRGB
GL_EXT_transform_feedback
GL_IBM_rasterpos_clip
GL_NV_blend_square
GL_NV_fog_distance
GL_NV_light_max_exponent
GL_NV_texgen_reflection
GL_SGIS_generate_mipmap
GL_SGIS_texture_edge_clamp
GL_SGIS_texture_lod
GL_SGI_color_matrix
OpenGL Limits
Display Mask 1 (0x00000001)
Renderer ID 137476 (0x00021904)
Off Screen No
Full Screen Yes
Hardware Accelerated Yes
Robust No
Backing Store Yes
MP Safe Yes
Window Yes
Multi Screen No
Compliant Yes
Buffer Modes 15 (0x0000000f)
Color Buffer Modes 176194560 (0x0a808400)
Accum Buffer Modes 8421376 (0x00808000)
Depth Buffer Modes 7169 (0x00001c01)
Stencil Buffer Modes 129 (0x00000081)
Max Aux Buffers 2 (0x00000002)
Max Sample Buffers 1 (0x00000001)
Max Samples 6 (0x00000006)
Sample Modes 3 (0x00000003)
Alpha Sampling Yes
GPU Vertex Processing Capable Yes
GPU Fragment Processing Capable Yes
Total Video Memory 536870912 (0x20000000)
Total Texture Memory 519766016 (0x1efb0000)
Apple Software Renderer
On 6 avr. 08, at 18:00, vtkusers-request at vtk.org wrote:
> Message: 8
> Date: Sun, 6 Apr 2008 09:11:35 -0400
> From: "Francois Bertel" <francois.bertel at kitware.com>
> Subject: Re: [vtkusers] Bug in font rendering if shadow == true ?
> To: vtkusers at vtk.org
> Message-ID:
> <d9819a910804060611t1aab2a3cwd10d008c400cd15d at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi Antoine,
>
> Which class are you using to display the text given by your
> screenshot? In other words, which class is using vtkFreeTypeUtilities
> underneath in your case?
> There are several of them using vtkFreeTypeUtilities:
> vtkOpenGLFreeTypeTextMapper, vtkTextActor, vtkTextActor3D,
> vtkTextRepresentation, vtkCaptionRepresentation.
>
> It sounds like an issue with pre-multiplied rgb with an associated
> alpha vs rgb which an unassociated alpha.
>
> Can you send your OpenGL version and set of extensions, either by
> sending the output of:
> $ ctest -R LoadOpenGLExtension -V &> output.txt
>
> or by using a platform specific method:
> http://www.vtk.org/Wiki/VTK_FAQ#How_do_I_check_which_OpenGL_versions_or_extensions_are_supported_by_my_graphic_card_or_OpenGL_implementation.3F
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