gl4es ==== This is a library providing OpenGL 1.x functionality for OpenGL ES accelerated hardware. This is a fork a glshim (https://github.com/lunixbochs/glshim). Go check this lib if you need things like RemoteGL or if need support for TinyGLES (for 100% software rendering). The focusse is on compatibility with a wide selection of game and software, as well as speed. It has been tested successfully of a large selection of games and software, including: Mincraft, OpenMW, SeriousSam, RVGL, TSMC, TORCS, SpeedDreams, GL-117, Blender 2.68 and many more. Most function of OpenGL up to 1.5 are supported, with some notable exceptions: * Reading of Depth or Stencil buffer will not work * GL_FEEDBACK mode is not implemented Some know limitations: * GL_SELECT as some limitation in its implementation (for exemple, current Depth buffer or binded texture are not taken into account) * NPOT texture are supported, but not with GL_REPEAT / GL_MIRRORED, only GL_CLAMP will work properly (unless the GLES Hardware support NPOT) * Framebuffer use FRAMEBUFFER_OES extension (that must be present in the GLES 1.1 stack) * Multiple Color attachment on Framebuffer are not supported * OcclusionQuery is implemented, but with a 0 bits precision * Probably many other things ---- Compiling ---- *for Pandora* cmake . -DPANDORA=1; make GL *or for the Raspberry Pi* cmake . -DBCMHOST=1; make GL *or for the ODroid* cmake . -DODROID=1; make GL *or for CHIP machines* cmake . -DCHIP=1; make GL *or for Android* An Android.mk is provided that should compile with an NDK *or use ccmake* Alternatively, you can use the curses-bases ccmake (or any other gui frontend for cmake) to select wich platform to use interactively. ---- GLU ---- Standard GLU do works without any issues. ---- Installation ---- Put lib/libGL.so.1 in your `LD_LIBRARY_PATH`. ---- Usage ---- There are many environnement variable to control gl4es behavour. All are numeric, except LIBGL_VERSION that take a string. ##### LIBGL_FB Controls the Framebuffer output * 0 : Default, using standard x11 rendering * 1 : Use Framebuffer output (x11 bypassed, only fullscreen) * 2 : Use Framebuffer, but also an intermediary FBO * 3 : Use PBuffer, allowing x11 (and windowed) rendering even if driver doesn't support it ##### LIBGL_XREFRESH Debug helper in specific cases * 0 : Default, nothing special * 1 : xrefresh will be called on cleanup ##### LIBGL_STACKTRACE Automatic Backtrace log * 0 : Default, nothing special * 1 : stacktrace will be printed on crash ##### LIBGL_VSYNC VSync control * 0 : Default, nothing special * 1 : vsync enabled ##### LIBGL_RECYCLEFBO Recycling FBO special case (don't delete a created FBO, but recycle it if needed) * 0 : Default, nothing special * 1 : Recycling of FBO enabled ##### LIBGL_MIPMAP Handling of Manual and Automatic MIPMAP * 0 : Default, nothing special * 1 : AutoMipMap forced * 2 : guess AutoMipMap (based on manual mipmaping on textures) * 3 : ignore MipMap (mipmap creation / use entirely disabled) * 4 : ignore AutoMipMap on non-squared textures ##### LIBGL_TEXCOPY Make a local copy of every texture for easy glGetTexImage2D * 0 : Default, nothing special * 1 : Texture copy enabled ##### LIBGL_SHRINK Texture shrinking control * 0 : Default, nothing special * 1 : everything / 2 (using original algorithm for size reduction, all other shink mode use a refined algorithm) * 2 : only textures wich one size > 512 are / 2 * 3 : only textures wich one size > 256 are / 2 * 4 : only textures wich one size > 256 are / 2, and the one > 1024 are / 4 * 5 : only textures wich one size > 256 are resized to 256 (if possible, because only /2 and /4 exists), but empty texture are not shrinked * 6 : only textures wich one size > 128 are / 2, thoses >= 512 are resized to 256 (if possible, because only /2 and /4 exists), but empty texture are not shrinked * 7 : only textures wich one size > 512 are / 2, but empty texture are not shrinked * 8 : advertise a max texture size of 8192, but every texture wich one size > 2048 are shrinked to 2048 * 9 : advertise a max texture size of 8192, but every texture wich one size > 4096 are / 4 and the one > 512 are / 2, but empty texture are not shrinked * 10: advertise a max texture size of 8192, but every texture wich one size > 2048 are / 4 and the one > 512 are / 2, but empty texture are not shrinked ##### LIBGL_TEXDUMP Texture dump * 0 : Default, nothing special * 1 : Texture dump enabled ##### LIBGL_ALPHAHACK Experimental: enable Alpha test only when using texture that contains an alpha channel * 0 : Default, nothing special * 1 : Alpha Hack enabled ##### LIBGL_NODOWNSAMPLING Texture downsampling control * 0 : Default, DXTc texture are downsampled to 16bits * 1 : DXTc texture are left as 32bits RGBA ##### LIBGL_STREAM PANDORA only: enable Texture Streaming (works only on RGB textures) * 0 : Default, nothing special * 1 : Enabled on empty RGB textures * 2 : Enabled on all RGB textures ##### LIBGL_COPY Control the glCopyTex(Sub)Image2D hack (they are buggy on pandora and don't work most of the time) * 0 : Don't use native glCopyTex(Sub)Image2D, but a workaround function using FBO * 1 : No glCopyTexImage2D / glCopyTexSubImage2D hack, use native ones ##### LIBGL_NOLUMALPHA Control the availability of the LUMUNANCE_ALPHA format (can be buggy on Pandora model CC) * 0 : Default,GL_LUMINANCE_ALPHA is available and used if needed * 1 : GL_LUMINANCE_ALPHA hardware support disabled (a GL_RGBA texture will be used instead) ##### LIBGL_BLENDHACK Experimental: Change Blend GL_SRC_ALPHA, GL_ONE to GL_ONE, GL_ONE * 0 : Default, nothing special * 1 : Change Blend GL_SRC_ALPHA, GL_ONE to GL_ONE, GL_ONE (can be usefull for Xash3D engine) ##### LIBGL_BLENDCOLOR Hack: Export a (faked) glBlendColor * 0 : Default, don't expose gBlendColor * 1 : Exposed the function (if no hadware support, faked function willbe used) ##### LIBGL_VERSION Hack: Control the glGetString version. Overide version string (should be in the form of "1.x") ##### LIBGL_BATCH Experimental: Batch mode (fuse of contigous Display list, to limit Draw calls) * 0 : Default, only Draw list created during a glList are fused (i.e. contigous glBegin / glEnd inside a List) * 1 : Force a maximum of call to be batched (like if all was inside a big glList) * 2 : Disable Batch mode completly, no fuse of draw list ##### LIBGL_NOERROR Hack: glGetError() always return GL_NOERROR * 0 : Default, glGetError behave as it should * 1 : glGetError never fail. ##### LIBGL_GAMMA Pandora Hack: Set a Gamma value (in decimal formal, 1.0 means no gamma boost) * X.Y : Use X.Y as gamma when creating context (typical value can be 1.6 or 2.0) ##### LIBGL_SRGB ODROID Hack: Enable sRGB Surface (so Gamma corrected), if Hardware support it * 0 : Default, don't try to use sRGB surface * 1 : Enable sRGB Surface (but support will be tested first, must have EGL_KHR_gl_colorspace extension) ##### LIBGL_FASTMATH Hack: Activate some Fast Math in processor/coprocessor * 0 : Default, nothing special * 1 : On OpenPandora, activate "RunFast" on Cortex-A8 (mode default NaN, flush-to-zero) : Not implemented on other platforms (will do nothing) ##### LIBGL_SILENTSTUB Debug: Hide or Show the Sub / Not found message * 0 : Default, the messages are shown * 1 : Silent, don't print the STUB or glXGetProcAddress glXXXXX not found message ##### LIBGL_NOBANNER Show/Hide initial text * 0 : Default, print starting message * 1 : Silent: no LIBGL message at start (combile with LIBGL_SILENTSTUB for more silence) ##### LIBGL_NPOT Expose NPOT (Non Power of Two) Support * 0 : Default, don't expose the extension (but npot are still supported) * 1 : Expose limited NPOT extension * 2 : Expose GL_ARB_texture_non_power_of_two extension ##### LIBGL_GLQUERIES Expose glQueries functions * 0 : Don't expose the function (fake one will be used if called) * 1 : Default, expose fake functions (always answer 0) ##### LIBGL_NOTEXMAT Handling of Texture Matrix * 0 : Default, perform handling internaly (better handling of NPOT texture on all hardware) * 1 : Let the driver handle texmat (can be faster in some cases, but NPOT texture may be broken) ##### LIBGL_NOTEST Initial Hardware test * 0 : Default, perform intial hardware testing (using a PBuffer) * 1 : Do not perform test (no extensions tested or used) ##### LIBGL_NOVAOCACHE VAO Caching * 0 : Default, tr to cache vao to avoid memcpy in render list * 1 : Don't cache VAO ---- Version history ---- ##### 0.9.4 * Fixed some extended functions (like glBlendFuncSeparate) not working inside list (fixing some issues with Batch mode) * Added back GL_TEXTURE_RECTANGLE_ARB handling (and using npot texture, even limited, if available) * Added tracking of Lights and Materials * Fixed (Added in fact) support for Multisampling on the GLX Context creation (a bit hacky, but seems to works) * Added LIBGL_NODOWNSAMPLING and associated Hint * Try to implement some caching on VAO to avoid some memcpy in renderlist (with a way to disable it just in case) ##### 0.9.3 * Added support for Cube Mapping (with hardware support) * Improved Texture state tracking * Added LIBGL_NOTEXMAT env. var. switch for Texture Matrix handling * Added GL_EXT_vertex_array_bgra (and NEONinzed some loop) * Finished GL_EXT_direct_state_access extension * Mangled glX function (to be abble to use apitrace to capture GL frames) * Return some values in glXQueryServerString, coherent with glXGetClientString ##### 0.9.2 * All matrix are tracked now * Texture Matrix are 100% handled by gl4es. GLES Hardware keep an Identity matrix (TexCoord are transformed if needed). This allows a better handling of NPOT texture on hadware that doesn't support Full NPOT (fixed movies beiing horizontaly shifted in openmw with LIBGL_NPOT=1 for example) ##### 0.9.1 * Added gl4es specifics glHint capabilities. If the extension GL_GL4ES_hint is present, than a few Hint are accessible. Look in include/gl4eshint.h for the list. ##### 0.9.0 * New name: gl4es