osgEarth纹理使用问题

hello!

我写的osgEarth的一个.earth文件如下：
<map name="Transportation" type="geocentric">
    <!--Add a base map of the blue marble data-->
    <image name="bluemarble" driver="gdal">
        <url>..data/world.tif</url>
    </image>

    <!--Add a high resolution inset of Washington, DC-->
    <image name="dc" driver="gdal">
        <url>../data/dc_high_res1.tif</url>
    </image>

    <!--Add a high resolution inset of Washington, DC-->
    <image name="dc" driver="gdal">
        <url>../data/dc_high_res2.tif</url>
    </image>

    <!--Add a high resolution inset of Washington, DC-->
    <image name="dc" driver="gdal">
        <url>../data/dc_high_res3.tif</url>
    </image>

    <!--Add a high resolution inset of Washington, DC-->
    <image name="dc" driver="gdal">
        <url>../data/dc_high_res4.tif</url>
    </image>

</map>
除了world.tif可以正常显示外，其他后面4个纹理只能够显示前三个纹理图片，不管我把哪些纹理放在前三，总是只是显示前三个纹理，请问这是怎么了呢？多谢。

hello!

现在明白了。是要对layering_technique进行设置，否则osgEarth会根据硬件情况自己读入有限数目的纹理图片。例如采用
  <engine_properties>
      <layering_technique>composite</layering_technique>
   </engine_properties>
或者
  <engine_properties>
      <layering_technique>multipass</layering_technique>
   </engine_properties>
但是采用multipass发现osgEarth运行效率很低，cpu占用率太高了。而composite需要图形卡支持GL_TEXTURE_2D_ARRAY_EXT 纹理扩展，请问大家对于什么显卡支持GL_TEXTURE_2D_ARRAY_EXT 纹理扩展有了解么？如何知道自己的显卡是否支持GL_TEXTURE_2D_ARRAY_EXT ？多谢

array

更新显卡驱动到OpenGL 2.0以上就可以支持texture array了

hello!

多谢

hello!

可是我查了一下我的opengl版本是2.1.2，
显卡为NVIDIA Quadro Fx1700/PCI/SSE2
不知道为何不支持您说的texture array

array

您是如何知道自己不支持GL_TEXTURE_2D_ARRAY_EXT的？

hello!

奥，我是不太清楚的。因为我之前看到osgEarth的composite需要图形卡支持GL_TEXTURE_2D_ARRAY_EXT 纹理扩展，而我实验composite效果不成功，所以以为自己显卡不支持GL_TEXTURE_2D_ARRAY_EXT，当然这样有些武断了。

array

有一个很简单的办法可以判断您的系统是否支持某一种扩展，在控制台下输入：
set OSG_NOTIFY_LEVEL=INFO
osgviewer cow.osg
然后切换到控制台下查看输出的信息，其中就包含了OSG检测到的所有可支持的扩展，搜索其中是否有GL_EXT_texture_array或者其他可能的字样就可以了。当然您也可以自己用OpenGL的方式来检测

hello!

您的方法我试验了。的确有效。我的显卡驱动支持的opengl是2.1.2，但是所支持的opengl格式中没有包括GL_TEXTURE_2D_ARRAY_EXT，请问这是显卡自身问题么？

array

请搜索GL_EXT_texture_array的字样，也不排除有这种可能

hello!

试验过了，但是没有找到GL_EXT_texture_array的字样

hello!

请问您显卡支持GL_TEXTURE_2D_ARRAY_EXT没有问题吧？

array

of course

hello!

多谢，我利用您的方法查到的我显卡支持opengl的情况列表如下，列表最后说的glVersion=2.01是指我的opengl是2.01版本的，但是是否由于我的glsl版本低了，所以不支持GL_TEXTURE_2D_ARRAY_EXT呢？
谢谢。


OpenGL extensions supported by installed OpenGL drivers are:
    GL_ARB_color_buffer_float
    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_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_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_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_EXT_Cg_shader
    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_depth_bounds_test
    GL_EXT_draw_range_elements
    GL_EXT_fog_coord
    GL_EXT_framebuffer_object
    GL_EXT_multi_draw_arrays
    GL_EXT_packed_depth_stencil
    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_clear_tag
    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_add
    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_timer_query
    GL_EXT_vertex_array
    GL_HP_occlusion_test
    GL_IBM_rasterpos_clip
    GL_IBM_texture_mirrored_repeat
    GL_KTX_buffer_region
    GL_NVX_conditional_render
    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_program2
    GL_NV_fragment_program_option
    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_NV_vertex_program3
    GL_S3_s3tc
    GL_SGIS_generate_mipmap
    GL_SGIS_texture_lod
    GL_SGIX_depth_texture
    GL_SGIX_shadow
    GL_SUN_slice_accum
    GL_WIN_swap_hint
    WGL_ARB_buffer_region
    WGL_ARB_extensions_string
    WGL_ARB_make_current_read
    WGL_ARB_multisample
    WGL_ARB_pbuffer
    WGL_ARB_pixel_format
    WGL_ARB_render_texture
    WGL_ATI_pixel_format_float
    WGL_EXT_extensions_string
    WGL_EXT_swap_control
    WGL_NV_float_buffer
    WGL_NV_render_depth_texture
    WGL_NV_render_texture_rectangle
OpenGL extension 'GL_ARB_vertex_program' is supported.
OpenGL extension 'GL_EXT_secondary_color' is supported.
OpenGL extension 'GL_EXT_fog_coord' is supported.
OpenGL extension 'GL_ARB_multitexture' is supported.
OpenGL extension 'GL_NV_occlusion_query' is supported.
OpenGL extension 'GL_ARB_occlusion_query' is supported.
OpenGL extension 'GL_EXT_timer_query' is supported.
OpenGL extension 'GL_EXT_secondary_color' is supported.
OpenGL extension 'GL_EXT_fog_coord' is supported.
OpenGL extension 'GL_ARB_multitexture' is supported.
OpenGL extension 'GL_EXT_texture_filter_anisotropic' is supported.
OpenGL extension 'GL_ARB_texture_compression' is supported.
OpenGL extension 'GL_EXT_texture_compression_s3tc' is supported.
OpenGL extension 'GL_IBM_texture_mirrored_repeat' is supported.
OpenGL extension 'GL_EXT_texture_edge_clamp' is supported.
OpenGL extension 'GL_ARB_texture_border_clamp' is supported.
OpenGL extension 'GL_SGIS_generate_mipmap' is supported.
OpenGL extension 'GL_ARB_shadow' is supported.
OpenGL extension 'GL_ARB_shadow_ambient' is not supported.
OpenGL extension 'GL_APPLE_client_storage' is not supported.
OpenGL extension 'GL_ARB_texture_non_power_of_two' is supported.
OpenGL extension 'GL_EXT_texture_integer' is not supported.
OpenGL extension '' is not supported.
OpenGL extension 'GL_ARB_pixel_buffer_object' is supported.
OpenGL extension 'GL_ARB_fragment_program' is supported.
OpenGL extension 'GL_EXT_framebuffer_object' is supported.
OpenGL extension 'GL_EXT_framebuffer_blit' is not supported.
OpenGL extension 'GL_ARB_shader_objects' is supported.
OpenGL extension 'GL_ARB_vertex_shader' is supported.
OpenGL extension 'GL_ARB_fragment_shader' is supported.
OpenGL extension 'GL_ARB_shading_language_100' is supported.
OpenGL extension 'GL_EXT_geometry_shader4' is not supported.
OpenGL extension 'GL_EXT_gpu_shader4' is not supported.
glVersion=2.01, isGlslSupported=YES, glslLanguageVersion=1.1
OpenGL extension 'GL_ARB_vertex_program' is supported.
Setting up osg::Camera::FRAME_BUFFER
OpenGL extension '' is not supported.
Setting up osg::Camera::FRAME_BUFFER

tianxiao888

glsl是oGL的一部分啊

hello!

glVersion=2.01, isGlslSupported=YES, glslLanguageVersion=1.1
可见上面是分开的

array

我不认为这两者有什么关系，至少我在OpenGL官方的标准说明上没有看到这样的字样