Previously posted at mesa-users. TL;DR: GL_EXTENSIONS string does not contain "GL_OES_mapbuffer", but the mapbuffer extension functions are still available through eglGetProcAddress().
I am using Mesa GLESv2 with Linaro's glmark2 benchmark. The benchmark uses the functions "glMapBufferOES" and "glUnmapBufferOES" from the "GL_OES_mapbuffer" extension, as seen in this function: http://git.linaro.org/gitweb?p=people/afrantzis/glmark2.git;a=blob;f=src/canvas-x11-egl.cpp;h=f69e6f40a32832c5cb12eafc94afc8d5d320887e;hb=HEAD#l256 What this function does: 1. Call glGetString(GL_EXTENSIONS), to get a string containing all the extensions. 2. Checks for "GL_OES_mapbuffer" in the extension list string from Step #1. 3. If "GL_OES_mapbuffer" is found in Step #2, it proceeds to get the functions gl[Map|UnMap]BufferOES. 4. If it is not found, the function takes no action, and the benchmark later fails because it was not given the map/unmap functions. However, I was able to get the map/unmap functions by bypassing the check in Step #2 and calling eglGetProcAddress() regardless of whether the string contained the mapbuffer extension. And then the benchmark runs successfully, meaning that the mapbuffer extension actually does exist, it is just not being exported in by glGetString(GL_EXTENSIONS). For reference, I am building Mesa with the following configuration: ./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=i686-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-option-checking --with-driver=dri --disable-glut --without-demos --enable-xcb --enable-egl --enable-gles1 --enable-gles2 --enable-shared-glapi --enable-gallium --disable-debug --enable-glx-tls --disable-glw --disable-motif --enable-asm --with-dri-drivers=,i915,i965 --with-gallium-drivers=,swrast,i915 --with-egl-platforms=drm The only GL_OES extensions contained in the GL_EXTENSIONS string are: GL_OES_read_format GL_OES_EGL_image Thanks, Simon _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
