GEM-dev February 2008

gem-dev@lists.iem.at

5 participants
6 discussions

Gem vs ATi fglrx vs GLEW vs OpenGL 2.0
by Claude Heiland-Allen 03 Mar '08

03 Mar '08

Hi all, I found this: http://ati.cchtml.com/show_bug.cgi?id=193 I ran the test program attached to that bug report, it reported success. But Gem (without "--with-glversion=1.5") still fails to load with glUniform2i undefined. Then I tried some semi-random hacking of code: #include <GL/glew.h> // just before #include <GL/gl.h> in Base/GemGL.h and adding -lGLEW to the Make.config (iirc). Gem now compiles without error and loads without error, but segfaults in numerous situations, including plain texturing (gdb indicates jumping to a null pointer). The key function in the OpenGL 2.0 tester seems to be: typedef void (*__GLXextFuncPtr)(void); extern "C" __GLXextFuncPtr glXGetProcAddressARB (const GLubyte *); which is only referenced in: pd-gem/Gem/src/Base/glxew.h pd-gem/Gem/src/Base/glew.cpp I noticed glewInit() is only called on Windows: pd-gem/Gem/src/Base/GemWinCreateNT.cpp: GLenum err = glewInit(); So I hacked something in GemWinCreateXWin.cpp: #ifdef USE_GLEW GLenum err = glewInit(); if (GLEW_OK != err) error("failed to init GLEW"); else post("GLEW version %s",glewGetString(GLEW_VERSION)); #endif and added #include <GL/glew.h> in GemWinCreate.h, and I got a Gem that compiled and loaded without errors, no segfaults so far either, but also no working shaders: Direct Rendering enabled! GLEW version 1.3.4 GEM: Start rendering linking: link 1.07374e+09 0 linking: link 1.07374e+09 5.36871e+08 [glsl_program]: Info_log: [glsl_program]: Link successful. There are no attached shader objects. [pix_image]: GEM: thread loaded image: /home/claude/src/pd-gem/Gem/examples/10.glsl/img3.jpg GL: invalid value With 02_primitive_distortion.pd I get an undistorted textured sphere, similarly the other examples (everything looks like no special shaders are running). The large numbers for the shader ids look a bit suspicious to me, as does the "no attached shader objects". Would be useful if "GL: invalid value" could be made more verbose, too. So, any clues? Some more info from Pd: [glsl_vertex]: Vertex_shader Hardware Info [glsl_vertex]: ============================ [glsl_vertex]: MAX_VERTEX_ATTRIBS: 32 [glsl_vertex]: MAX_VERTEX_UNIFORM_COMPONENTS_ARB: 4096 [glsl_vertex]: MAX_VARYING_FLOATS: 44 [glsl_vertex]: MAX_COMBINED_TEXTURE_IMAGE_UNITS: 16 [glsl_vertex]: MAX_VERTEX_TEXTURE_IMAGE_UNITS: 0 [glsl_vertex]: MAX_TEXTURE_IMAGE_UNITS: 16 [glsl_vertex]: MAX_TEXTURE_COORDS: 8 [glsl_fragment]: glsl_fragment Hardware Info [glsl_fragment]: ============================ [glsl_fragment]: MAX_FRAGMENT_UNIFORM_COMPONENTS: 4096 [glsl_fragment]: MAX_TEXTURE_COORDS: 8 [glsl_fragment]: MAX_TEXTURE_IMAGE_UNITS: 16 [glsl_program]: glsl_Program Hardware Info [glsl_program]: ============================ [glsl_program]: I'm running Debian Stable with ATi proprietary fglrx driver for a Mobility Radeon 9700 card. Thanks, Claude -- http://claudiusmaximus.goto10.org

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[ pd-gem-Feature Requests-1901418 ] pix_write to a PPM stream
by SourceForge.net 25 Feb '08

25 Feb '08

Feature Requests item #1901418, was opened at 2008-02-25 14:46 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=507082&aid=1901418&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Priority: 5 Private: No Submitted By: ClaudiusMaximus (claudiusmaximus) Assigned to: Nobody/Anonymous (nobody) Summary: pix_write to a PPM stream Initial Comment: I would very much like if pix_write could write successive frames to a PPM stream. This would let me to do things like: mkfifo stream.ppm && pd -nogui -lib Gem -open my-rendering-patch.pd & cat stream.ppm | ppmtoy4m ... | y4mscaler ... | mpeg2enc ... At the moment I'm rendering to multiple TIFF files, which takes a vast amount of temporary disk space, and is more complicated to encode later. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=507082&aid=1901418&group_…

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[ pd-gem-Bugs-1897134 ] getFramerate method in GemMan needed for VideoIO
by SourceForge.net 19 Feb '08

19 Feb '08

Bugs item #1897134, was opened at 2008-02-19 18:30 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=507079&aid=1897134&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Georg Holzmann (grholzi) Assigned to: Nobody/Anonymous (nobody) Summary: getFramerate method in GemMan needed for VideoIO Initial Comment: To get last years google summer of code project, the videoIO framework, finally working as a Gem external I need the getFramerate method in GemMan. This was already discussed on the mailinglist last year, however, nobody commited it so far. The code is in the videoIO branch in the files: GemMan.h: line 128 GemMan.cpp: line 1506 - 1509 It would be nice if that could be integrated in main gem, then the videoIO framework would be useable as an external to GEM ! Thanks, LG Georg ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=507079&aid=1897134&group_…

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tv distortion pix_
by Jozef Henzl 14 Feb '08

14 Feb '08

Hello, I'd like to simulate the analog tv distortion with a gem. It should include: * pixel shifts (for each r-g-b-a channel) * ghosting * image shift (like when you have a bad sync on a tv and image is sweeping up-down the screen) It seems I'll need to code some of the effects by myself, but if you have a solution how to achieve a good result with a current pix objects, it'll save me a bit of work. and by the way, i've coded something what i call "jpeg fooker". It encodes current pix data to a jpeg data, and does some changes in it (DQT value rewriting). Then the jpeg data are decoded back to rgba. It causes various funky image distortions and glitches. But the drawback is high cpu usage during the re/encoding - but i'm using it for live productions. -- Jozef Henzl http://popcorp.org http://chan.cz

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create a .obj from gem
by cyrille henry 08 Feb '08

08 Feb '08

hello, i've made a "cube2obj" object that get a gemlist and output 3d position of a cube. the syntax is similar than in a .obj file. this mean that if you only draw only cube, you can easilly create a obj file of your scene. (basically, i just get the transformation matrix, and compute the position of the 8 cubes points) this export is very slow, and i also have a small problem with number (1 should be written 1.0 in obj file.) so, i'm wondering if your interested to add this object to the cvs. (i will probably not have time to extend it to other primitives) cyrille

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filmFFMPEG: img_convert -> sws_scale?
by Jim McCann 01 Feb '08

01 Feb '08

Hello, I was compiling Gem against a recent ffmpeg and noticed that it still uses the img_convert call, along with, perhaps, some other deprecated functionality. I patched it [img_convert] out thusly: (filmFFMPEG.cpp @ 314) // was: if (img_convert(&rgba,dstfmt,&m_Picture,fmt,width,height)<0) //Patched to use swsscale instead of img_convert: static SwsContext *sws_context = NULL; sws_context = sws_getCachedContext(sws_context, width, height, fmt, width, height, dstfmt, 0, NULL, NULL, NULL); if (!sws_context) error("ffmpeg-conversion failed (%d->%d)", fmt, dstfmt); else if (sws_scale(sws_context, m_Picture.data, m_Picture.linesize, 0, height, rgba.data, rgba.linesize)<0) error("ffmpeg-conversion failed (%d->%d)", fmt, dstfmt); (also added swscale.h to the header; added -lswscale with PKG_CONFIG_FFMPEG) However, (a) I'm not sure this is a great option, since sws_getCachedContext will de- and re- allocate contexts repeatedly, e.g. if decoding multiple streams of different sizes. If there is there a way to make that SwsContext per-object, it would work better. (b) haven't found a test video that actually works yet (I have mostly .mkv's and ffmpeg gives a decode error on 'em). (c) From all the #defines in the code, it seems like multiple- version compatibility is really important, and -- of course -- this also breaks that. (d) there is other deprecated stuff yet to patch out, but see (c). Anyway, figured I'd email this list and see if anyone was working on it or had suggestions. Good day, --Jim

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GEM-dev February 2008