Hello Community! I have some good news regarding running and building OpenSCAD on Raspberry Pi 3 with Raspbian stretch and QtOpenGL. Yes - finally I have hacked a working example - as in working (not feature complete though) - and the code is on Github https://github.com/henwist/hacky_openscad_2018 <https://github.com/henwist/hacky_openscad_2018> on branch opengles2. The code is not in production state yet and will not be for some time to come. Bear in mind that this is a hack and I have commented code and added code on top of functions, added classes to existing ones, left code that don't do anything useful and probably done some bad looking solutions that would not pass any code reviews at all. That said - I have built this version natively on a Raspberry Pi 3 with 2GB swap partition and standard Qt5.7.1 as delivered by Raspbian. GLEW is not in the way anymore and compilation works beautifully natively as expected. Now to functionality of OpenSCAD: F6 render works as expected and will output a model that can be zoomed and rotated in a rudimentary way, but F5 preview will not function as expected. F5 will just output models without knowing if it is a hole or a solid object, so there will just be solids on top on each other. *And* there may be leftovers from a earlier render or preview - the vertices are not deleted between runs. So I think we have some options to discuss on the armhf platform (or any other platform that only have OpenGL ES2): 1. Disable F5 preview (the easiest one). 2. Rewrite OpenCSG to use OpenGL ES2 functions instead of the ones used now and not use GLEW. 3. The one you think of... Regardless of the outcome of the OpenCSG matter, I think it is of interest to be able to use OpenSCAD on armhf platforms than not being able to use it at all. I am ready to code the full solution (not OpenCSG though) with OpenGL ES2 so that all GUI functions using OpenGL under the hood will be usable in F6 render mode - if the Community thinks this is viable. What do you think the solution is to the matter of F5 preview on platforms with OpenGL ES2 renderer? //Best regards Henrik -- Sent from: http://forum.openscad.org/

Hi Henrik, This sounds great! Regarding Preview support, I would suggest: 1. Make it possible to turn off (probably at compile time), with reasonable GUI behavior (e.g. warning popup or greyed out menu entries) 2. Port OpenCSG to OpenGLES. Since 2. will take some time, starting on 1. would make sense. For 2., this is perfectly doable; there is nothing in OpenCSG that inherently requires OpenGL proper. Before embarking on that, touching base with the OpenCSG author would make sense. I can also be of assistance as I'm quite familiar with the underlying algorithm used in OpenCSG. -Marius

kintel wrote > Regarding Preview support, I would suggest: > > 1. Make it possible to turn off (probably at compile time), with > reasonable GUI behavior (e.g. warning popup or greyed out menu entries) > 2. Port OpenCSG to OpenGLES. > > Since 2. will take some time, starting on 1. would make sense. > For 2., this is perfectly doable; there is nothing in OpenCSG that > inherently requires OpenGL proper. Before embarking on that, touching base > with the OpenCSG author would make sense. I can also be of assistance as > I'm quite familiar with the underlying algorithm used in OpenCSG. > > -Marius Hi Marius, This sounds ok to me... I think I'll start with 1. and a compile time #ifdef could prohibit F5 preview from working on OpenGL ES2-only platforms in addition to greyed out menu entries. Regarding 2., which I don't have the knowledge of to be able to port yet - but someone may find it an adventourus journey: I have researched which OpenGL functions that are needed in OpenCSG and which are in Raspbian stretch: *OpenCSG OpenGL functions in use vs libGLESv2 OpenGL ES2 functions in Raspbian stretch: * / 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBindFramebuffer 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBindRenderbuffer 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBindTexture 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glCheckFramebufferStatus 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glClearColor 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glClearDepth 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glClearStencil 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glCullFace 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteFramebuffers 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteRenderbuffers 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteTextures 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDepthFunc 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDepthMask 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDepthRange 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glFramebufferRenderbuffer 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glFramebufferTexture2D 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glFrontFace 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenFramebuffers 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenRenderbuffers 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenTextures 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGetFloatv 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGetIntegerv 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glPixelStorei 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glReadPixels 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glScissor 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glTexImage2D 1 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glViewport 2 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glColorMask 2 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glIsEnabled 2 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glRenderbufferStorage 2 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glStencilFunc 2 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glStencilMask 2 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glStencilOp 2 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glTexParameteri 3 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDisable 3 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDrawArrays 3 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glEnable 8 in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glClear no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glAlphaFunc no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBeginOcclusionQueryNV no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBeginQueryARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBindFramebufferEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBindProgramARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glBindRenderbufferEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glCheckFramebufferStatusEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glColor3f no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glColor4ub no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glColor4ubv no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteFramebuffersEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteOcclusionQueriesNV no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteProgramsARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteQueriesARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDeleteRenderbuffersEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDepthBoundsEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDisableClientState no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glDrawPixels no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glEnableClientState no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glEndOcclusionQueryNV no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glEndQueryARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glFramebufferRenderbufferEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glFramebufferTexture2DEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenFramebuffersEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenOcclusionQueriesNV no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenProgramsARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenQueriesARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGenRenderbuffersEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGetOcclusionQueryuivNV no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glGetQueryObjectuivARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glLoadIdentity no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glLoadMatrixf no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glMatrixMode no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glMultMatrixf no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glPopAttrib no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glPopMatrix no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glProgramStringARB no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glPushAttrib no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glPushMatrix no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glRasterPos2i no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glRenderbufferStorageEXT no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glTexEnvi no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glTexGenfv no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glTexGeni no match in file: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 for: glVertexPointer / //Henrik -- Sent from: http://forum.openscad.org/

> On Mar 11, 2019, at 10:14, grit <henwist@gmail.com> wrote: > > > Regarding 2., which I don't have the knowledge of to be able to port yet - > but someone may find it an adventourus journey: > I have researched which OpenGL functions that are needed in OpenCSG and > which are in Raspbian stretch: > > *OpenCSG OpenGL functions in use vs libGLESv2 OpenGL ES2 functions in > Raspbian stretch: * OpenCSG implements multiple variants of algorithms for different generations of GPU hardware. Focusing on the most modern algorithm and ifdef'ing out the rest would also be a good start. -Marius