[driver bug] Material not passed to GLSL shader?

[egrath]

Hello,
i am currently playing around with Irrlicht and Shaders and got a little problem with my Materials. First of all i use the following shader to do simple Diffuse based Lighting:

Vertex:

Code: Select all

void main()
{
	vec3 normal, lightDir;
	vec4 diffuse;
	float NdotL;

	normal = normalize( gl_NormalMatrix * gl_Normal );
	lightDir = normalize( vec3( gl_LightSource[0].position ));
	
	NdotL = max( dot( normal, lightDir ), 0.0 );
	diffuse = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
	
	gl_FrontColor = NdotL * diffuse;
	gl_Position = ftransform();
}

Fragment:

Code: Select all

void main()
{
	gl_FragColor = gl_Color;
}

The code is taken from the tutorial over at Lighthouse3D and works in my Shader IDE as expected. Problem is that when this shader is used in Irrlicht, the gl_FrontMaterial does not contain the proper color values.

The Model has a Diffuse Color of [255 0 0] and should be showed as a simple lighted red Teapot, but it's just white (in Irrlicht, in the IDE everyhtings OK). I am not passing anything in to the shader, just using the built-in GLSL variables.

The Model definitly has the correct Diffuse Term set cause when using the Fixed Function Pipeline it shows up correct.

Any ideas?

Thanks,
Egon

[BlindSide]

This is strange because gl_FrontMaterial.diffuse should in theory take the value from wherever the fixed function pipeline is getting it.

We may be overlooking something so I'm gonna move this to the bug forum to be investigated more closely. What video card do you have? OpenGL implementations are generally driver-specific, so ATI would generally display different behavior (And bugs) from NVidia drivers.

For now please set the value via the shader callbacks until this is fixed.

[egrath]

Hello,

maybe you can reproduce the problem with the following sample code which produces the problem:

http://rapidshare.de/files/47896815/it10.tar.bz2.html

I am using the following configuration:

Code: Select all

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_create_context, GLX_ARB_multisample, 
    GLX_NV_float_buffer, GLX_ARB_fbconfig_float, GLX_EXT_framebuffer_sRGB
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_ARB_create_context, 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_NV_multisample_coverage
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_create_context, GLX_ARB_multisample, 
    GLX_NV_float_buffer, GLX_ARB_fbconfig_float, GLX_EXT_framebuffer_sRGB, 
    GLX_ARB_get_proc_address
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce 8600 GT/PCI/SSE2
OpenGL version string: 3.0.0 NVIDIA 180.44
OpenGL shading language version string: 1.30 NVIDIA via Cg compiler
OpenGL extensions:
    GL_ARB_color_buffer_float, GL_ARB_depth_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_map_buffer_range, 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_texture_rg, 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_swizzle, 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

Thanks,
Egon

[egrath]

Hello again,
seems to me like it's a driver issue. I've just tested my posted example on a Windows Vista Host and the Shader works as expected...

Egon

[offtopic]
God, i hate those buggy Linux Drivers. Why can't they (ATI|Nvidia) provide the same quality drives as they do for Windows? Don't they see if they produce crap drivers that we are forced to buy Hardware from minor vendors which provide good working drivers for our os?

Previously i thought that only ATI is providing crap drivers and that Nvidia is currently the only way to go with Linux. Seems that i have to change my mind and give ATI a try again...
[/offtopic]

[BlindSide]

Hmmm well since it's a driver issue the only way is a workaround and the simplest workaround is to just use the shader callbacks for these values and not rely on the OpenGL constants. You may also wanna make sure your linux drivers are up to date, they still fix things I hear.

Let's call this bug closed. Thanks for your effort btw.