X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;ds=sidebyside;f=README;h=f0b8bf2f1df8e710003aca3c26917127f66e6f7a;hb=a3adde5b296a124ea93f7c404e591b629dd05586;hp=b923a9c65f02e1482457cff42d19bf877c58b253;hpb=50854194400c3a9920454a7c5fe4080879daa974;p=apitrace

diff --git a/README b/README
index b923a9c..f0b8bf2 100644
--- a/README
+++ b/README
@@ -60,6 +60,12 @@ Build as:
  cmake -H. -Bbuild
  make -C build
 
+You can also build the 32bit GL wrapper on 64bit distro with a multilib gcc by
+doing:
+
+ cmake -H. -Bbuild32 -DCMAKE_C_FLAGS=-m32 -DCMAKE_CXX_FLAGS=-m32 -DCMAKE_LINK_FLAGS=-m32
+ make -C build32 glxtrace
+
 
 == Windows ==
 
@@ -83,19 +89,40 @@ http://www.cmake.org/Wiki/CmakeMingw for detailed instructions.
 
 == Linux ==
 
-* Run the application you want to trace as
+Run the application you want to trace as
 
- LD_PRELOAD=/path/to/libglxtrace.so /path/to/application
+ LD_PRELOAD=/path/to/glxtrace.so /path/to/application
 
-* View the trace with
+and it will generate a trace named "application.trace" in the current
+directory.  You can specify the written trace filename by setting the
+TRACE_FILE envirnment variable before running.
 
- /path/to/dump application.trace
+View the trace with
 
-* Replay the trace with
+ /path/to/tracedump application.trace | less -R
+
+Replay the trace with
 
  /path/to/glretrace application.trace
 
 
+The LD_PRELOAD mechanism should work with most applications.  There are some
+applications, e.g., Unigine Heaven, which global function pointers with the
+same name as GL entrypoints, living in a shared object that wasn't linked with
+-Bsymbolic flag, so relocations to those globals function pointers get
+overwritten with the address to our wrapper library, and the application will
+segfault when trying to write to them.  For these applications it is possible
+to trace by using glxtrace.so as an ordinary libGL.so and injecting into
+LD_LIBRARY_PATH:
+
+  ln -s glxtrace.so libGL.so
+  ln -s glxtrace.so libGL.so.1
+  ln -s glxtrace.so libGL.so.1.2
+  export LD_LIBRARY_PATH=/path/to/directory/where/glxtrace/is:$LD_LIBRARY_PATH
+  export TRACE_LIBGL=/path/to/real/libGL.so.1
+  /path/to/application
+
+
 == Windows ==
 
 * Copy opengl32.dll, d3d8.dll, or d3d9.dll from build/wrappers directory to the
@@ -105,7 +132,7 @@ http://www.cmake.org/Wiki/CmakeMingw for detailed instructions.
 
 * View the trace with
 
- /path/to/dump application.trace
+ /path/to/tracedump application.trace
 
 * Replay the trace with