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kmonsoor / pyglet

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text clipping when OpenGL depth test enabled #273

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. run the following example code on Mac OS 10.5.2
2. notice that there's strange clipping between some adjacent glyphs (WV, for 
example)

The problem is different depending on the exact font and font size, but never 
seems to go away 
completely.  This code is a condensed snippet; the problem happens in more 
"normal" OpenGL 
programs as well (for instance, turning blending on or changing the Z-buffer 
range doesn't make 
any difference).

pyglet 1.1 with Python 2.5: Paste in the output of `python -m pyglet.info`

Python
--------------------------------------------------------------------------
----
sys.version: 2.5.1 (r251:54863, Jan 17 2008, 19:35:17) 
[GCC 4.0.1 (Apple Inc. build 5465)]
sys.platform: darwin
os.getcwd(): 
/Volumes/Content_on_Mikes_DT_G4/Users/halazar/development/pyglet/processinglike

pyglet
--------------------------------------------------------------------------
----
pyglet.version: 1.1alpha2
pyglet.__file__: /Library/Python/2.5/site-packages/pyglet/__init__.pyc
pyglet.options['debug_trace_depth'] = 1
pyglet.options['audio'] = ('directsound', 'openal', 'alsa', 'silent')
pyglet.options['xsync'] = True
pyglet.options['shadow_window'] = True
pyglet.options['debug_win32'] = False
pyglet.options['debug_gl_trace'] = False
pyglet.options['debug_x11'] = False
pyglet.options['debug_font'] = False
pyglet.options['debug_media'] = False
pyglet.options['debug_trace'] = False
pyglet.options['debug_lib'] = False
pyglet.options['graphics_vbo'] = True
pyglet.options['vsync'] = None
pyglet.options['debug_trace_args'] = False
pyglet.options['debug_gl'] = True
pyglet.options['debug_graphics_batch'] = False
pyglet.options['font'] = ('gdiplus', 'win32')
pyglet.options['debug_gl_trace_args'] = False

pyglet.window
--------------------------------------------------------------------------
----
platform: <pyglet.window.carbon.CarbonPlatform object at 0x5ca2b0>
display: <pyglet.window.carbon.CarbonDisplay object at 0x5bef70>
screens[0]: CarbonScreen(x=0, y=0, width=1920, height=1200)
config['double_buffer'] = 1
config['stereo'] = 0
config['buffer_size'] = 32
config['aux_buffers'] = 0
config['sample_buffers'] = 0
config['samples'] = 0
config['red_size'] = 8
config['green_size'] = 8
config['blue_size'] = 8
config['alpha_size'] = 8
config['depth_size'] = 24
config['stencil_size'] = 0
config['accum_red_size'] = 0
config['accum_green_size'] = 0
config['accum_blue_size'] = 0
config['accum_alpha_size'] = 0
context: CarbonGLContext()

pyglet.gl.gl_info
--------------------------------------------------------------------------
----
gl_info.get_version(): 2.0 NVIDIA-1.5.24
gl_info.get_vendor(): NVIDIA Corporation
gl_info.get_renderer(): NVIDIA GeForce 7300 GT OpenGL Engine
gl_info.get_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_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_separate_stencil
   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_depth_bounds_test
   GL_EXT_draw_range_elements
   GL_EXT_fog_coord
   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_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_depth_clamp
   GL_NV_fog_distance
   GL_NV_fragment_program2
   GL_NV_fragment_program_option
   GL_NV_light_max_exponent
   GL_NV_multisample_filter_hint
   GL_NV_point_sprite
   GL_NV_register_combiners
   GL_NV_register_combiners2
   GL_NV_texgen_reflection
   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_edge_clamp
   GL_SGIS_texture_lod

pyglet.gl.glu_info
--------------------------------------------------------------------------
----
glu_info.get_version(): 1.3 MacOSX
glu_info.get_extensions():

pyglet.gl.glx_info
--------------------------------------------------------------------------
----
GLX not available.

pyglet.media
--------------------------------------------------------------------------
----
driver: pyglet.media.drivers.openal

pyglet.media.avbin
--------------------------------------------------------------------------
----
Library: <CDLL '/usr/local/lib/libavbin.dylib', handle d51dd50 at d44f510>
AVbin version: 2
FFmpeg revision: 10112

pyglet.media.drivers.openal
--------------------------------------------------------------------------
----
Library: <CDLL '/System/Library/Frameworks/OpenAL.framework/OpenAL', handle 
3f3460 at 
d43e5f0>
Version: (1, 1)
Extensions:
   ALC_EXT_CAPTURE
   ALC_ENUMERATION_EXT
   ALC_EXT_MAC_OSX
   ALC_EXT_ASA
   ALC_EXT_ASA_DISTORTION
   ALC_EXT_ASA_ROGER_BEEP

Other: Paste in the output of tools/gl_info.py (included in source distro):

Platform instance is <pyglet.window.carbon.CarbonPlatform object at 0x5c6b30>
Display instance is <pyglet.window.carbon.CarbonDisplay object at 0x5c0830>
Screens:
  CarbonScreen(x=0, y=0, width=1920, height=1200)
Creating default context...
GL attributes:
double_buffer=1 stereo=0 buffer_size=32 aux_buffers=0 sample_buffers=0
samples=0 red_size=8 green_size=8 blue_size=8 alpha_size=8
depth_size=24 stencil_size=0 accum_red_size=0 accum_green_size=0
accum_blue_size=0 accum_alpha_size=0
GL version: 2.0 NVIDIA-1.5.24
GL vendor: NVIDIA Corporation
GL renderer: NVIDIA GeForce 7300 GT OpenGL Engine
GL extensions:
  GL_ARB_texture_compression GL_NV_point_sprite GL_APPLE_element_array
  GL_APPLE_aux_depth_stencil GL_NV_fragment_program_option
  GL_EXT_blend_color GL_EXT_blend_subtract GL_EXT_stencil_wrap
  GL_EXT_texture_compression_s3tc GL_APPLE_transform_hint
  GL_ATI_separate_stencil GL_NV_vertex_program2_option
  GL_ARB_depth_texture GL_ARB_vertex_blend GL_APPLE_texture_range
  GL_APPLE_pixel_buffer GL_NV_texture_shader3 GL_NV_texture_shader2
  GL_EXT_blend_func_separate GL_APPLE_object_purgeable GL_APPLE_fence
  GL_APPLE_vertex_program_evaluators GL_ARB_occlusion_query
  GL_ARB_transpose_matrix GL_ARB_texture_border_clamp GL_EXT_fog_coord
  GL_NV_depth_clamp GL_ARB_texture_cube_map
  GL_EXT_blend_equation_separate GL_ARB_point_parameters
  GL_ATI_texture_env_combine3 GL_EXT_multi_draw_arrays
  GL_ARB_shader_texture_lod GL_EXT_texture_compression_dxt1
  GL_EXT_transform_feedback GL_ARB_vertex_program
  GL_ARB_texture_env_dot3 GL_EXT_bgra GL_SGIS_texture_edge_clamp
  GL_ARB_texture_env_combine GL_ARB_vertex_buffer_object
  GL_EXT_shadow_funcs GL_EXT_texture_env_add GL_EXT_packed_depth_stencil
  GL_EXT_texture_mirror_clamp GL_NV_multisample_filter_hint
  GL_APPLE_float_pixels GL_EXT_geometry_shader4 GL_ARB_point_sprite
  GL_EXT_framebuffer_object GL_ARB_texture_float GL_ARB_half_float_pixel
  GL_APPLE_vertex_array_range GL_NV_register_combiners
  GL_ARB_draw_buffers GL_ARB_fragment_program_shadow
  GL_ATI_texture_mirror_once GL_IBM_rasterpos_clip GL_EXT_texture_sRGB
  GL_EXT_stencil_two_side GL_NV_texgen_reflection
  GL_EXT_clip_volume_hint GL_EXT_compiled_vertex_array
  GL_NV_fragment_program2 GL_APPLE_vertex_array_object
  GL_ARB_vertex_shader GL_APPLE_flush_buffer_range
  GL_ARB_fragment_shader GL_ATI_texture_float GL_NV_texture_shader
  GL_ARB_imaging GL_APPLE_client_storage GL_ARB_fragment_program
  GL_ARB_shader_objects GL_ARB_shading_language_100 GL_APPLE_ycbcr_422
  GL_NV_blend_square GL_EXT_secondary_color
  GL_ARB_texture_non_power_of_two GL_EXT_texture_lod_bias
  GL_NV_fog_distance GL_EXT_abgr GL_ARB_texture_rectangle
  GL_ARB_multisample GL_SGIS_generate_mipmap
  GL_EXT_texture_filter_anisotropic GL_NV_light_max_exponent
  GL_EXT_blend_minmax GL_ARB_texture_env_crossbar GL_SGIS_texture_lod
  GL_NV_vertex_program3 GL_EXT_texture_rectangle GL_ARB_window_pos
  GL_APPLE_packed_pixels GL_ARB_shadow GL_ARB_texture_mirrored_repeat
  GL_EXT_gpu_program_parameters GL_NV_register_combiners2
  GL_ARB_multitexture GL_EXT_depth_bounds_test
  GL_EXT_draw_range_elements GL_APPLE_specular_vector
  GL_ARB_texture_env_add GL_APPLE_flush_render GL_EXT_rescale_normal
  GL_ARB_pixel_buffer_object
GLU version: 1.3 MacOSX
GLU extensions:

Context is CarbonGLContext()

Any additional info (platform/language/hardware) that may be relevant?

Pyglet version is current SVN.

Original issue reported on code.google.com by m...@halle.us on 17 Apr 2008 at 5:15

Attachments:

GoogleCodeExporter commented 9 years ago 
Yes, the adjacent glyphs are colliding in the depth buffer.

You need to either turn off depth-testing completely during text rendering or 
temporarily alter the depth testing function to GL_LEQUAL, GL_EQUAL or 
GL_ALWAYS.

Original comment by r1chardj0n3s on 17 Apr 2008 at 9:28

GoogleCodeExporter commented 9 years ago 
You can still composite text in a 3D scene by leaving depth testing enabled but 
disabling depth writes while 
drawing text.

Original comment by Alex.Hol...@gmail.com on 18 Apr 2008 at 12:27