Hi Daniel, I already filed it: https://bugs.freedesktop.org/show_bug.cgi?id=49996 Thanks and best regards Mark -----Urspr?ngliche Nachricht----- Von: Daniel Vetter [mailto:daniel.vetter at ffwll.ch] Im Auftrag von Daniel Vetter Gesendet: Samstag, 19. Mai 2012 22:43 An: Mark Newiger Cc: intel-gfx at lists.freedesktop.org Betreff: Re: OpenGL sampler objects on sandybridge with Ubuntu Linux 12.04 Hi, Please file a bug report with the below details on bugs.freedesktop.org against "Mesa" -> "DRI/Intel(i965)". Thanks, Daniel On Wed, May 16, 2012 at 09:58:45AM +0000, Mark Newiger wrote: > Hello, > > We are using an MiniPC with the following configuration: > > - Intel SandyBridge PC Mainboard DH61AG and integrated Intel HD Graphics 3000 > > - Dual OS: Windows 7 32bit and Ubuntu 12.04 32bit > > When using OpenGL sampler objects for configuring textures, on Ubuntu I have to create a mipmap chain by calling "glGenerateMipmap()". Otherwise the texture sampling will not work (e.g. returns black). > Take the following example: > // Init > int texture; > glGenTextures(1, &texture); > glBindTexture(GL_TEXTURE_2D, texture); glTexImage2D(...); > > int sampler; > glGenSamplers(1, &sampler); > glSamplerParameteri(sampler, GL_TEXTURE_MIN_FILTER, GL_LINEAR); > glSamplerParameteri(sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR); > > // Render loop > glActiveTexture(GL_TEXTURE0); > glBindTexture(GL_TEXTURE_2D, texture); glBindSampler(0, sampler); ... > > This works perfectly on Windows but not on Ubuntu. For Ubuntu Linux I have to add the following: > //Init > ... > glTexImage2D(...); > glGenerateMipmap(GL_TEXTURE_2D); > > Without the mipmap the texture sampling does not work, although I am not using any mipmaps. > When using the traditional texture filter configuration, this problem does not occur and the code behaves the same on Windows and Linux: > // Render loop > glActiveTexture(GL_TEXTURE0); > glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri(GL_TEXTURE_2D, > GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, > GL_TEXTURE_MAG_FILTER, GL_LINEAR); > > Seems to be a driver bug for me. Or did I oversee something ? > > Thanks and best regards > Mark > > > Best regards, > Mark Newiger | Senior Software Engineer SeeFront GmbH Esplanade 41 | > D-20354 Hamburg, Germany > Office: +49 40 416 22 64-83 > mark.newiger at seefront.com<mailto:mark.newiger at seefront.com> | > www.seefront.com<http://www.seefront.com> > > Managing Director: Christoph Grossmann Registered seat of the company: > Hamburg Register Court: Amtsgericht Hamburg HRB 98205 VAT-ID-No. > DE248406189 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
