Hello Michael, On 06/08/2012 03:51 AM, Michael Raab wrote: > we have a problem with the OpenSG Blendchunk implementation. We are trying to > render a geometry that has blend equation set to FUNC_ADD. The graphic chip > is either onBoard Intel or ATI. It seems that GL extension glBlendEquationEXT > is not supported by these chips. OpenSG throws a warning that indicates that > the extension is not supported. However I'm not sure if this extension is > necessary when using FUNC_ADD.
as far as I can tell glBlendEquationEXT is introduced by http://www.opengl.org/registry/specs/EXT/blend_minmax.txt With subsequent extensions - http://www.opengl.org/registry/specs/EXT/blend_subtract.txt - http://www.opengl.org/registry/specs/EXT/blend_logic_op.txt adding additional blending equations (GL_FUNC_ADD is just the OpenGL default blending equation: C' = clamp((Cs * S) + (Cd * D), 0.0, 1.0). If you need additive blending you can leave _sfBlendEquation set to GL_NONE (which is functionally equivalent to GL_FUNC_ADD anyway) and set _sfSrcFactor = GL_ONE and _sfDestFactor = GL_ONE. Cheers, Carsten ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
