Document build dependencies and demos

BUILD.md

@@ -3,34 +3,66 @@ The XGL Sample Intel driver supports Linux.
 System Requirements
 ===================
 
-Ubuntu 13.10, Ubuntu 14.04 LTS
-gcc
-drm
+Ubuntu 14.04 LTS, (Ubuntu 14.10 needed for DRI 3 demos)
+
+sudo apt-get install git subversion cmake libgl1-mesa-dev freeglut3-dev libglm-dev libpng12-dev
+sudo apt-get build-dep mesa
 
 
 BUILD
 =====
 
-The sample driver users cmake and should work with the usual cmake options and utilities.
+The sample driver uses cmake and should work with the usual cmake options and utilities.
 The standard build process builds the icd, the icd loader and all the tests.
 
 Example debug build:
 cd xgl  # cd to the root of the xgl git repository
+export KHRONOS_ACCOUNT_NAME= <subversion login name for svn checkout of BIL>
+./update_external_sources.sh  # fetches and builds glslang, llvm, LunarGLASS, and BIL
 cmake -H. -Bdbuild -DCMAKE_BUILD_TYPE=Debug
 cd dbuild
 make
 
 To run XGL programs you must tell the icd loader where to find the libraries. Set the
 environment variable LIBXGL_DRIVERS_PATH to the driver path. For example:
-> export LIBXGL_DRIVERS_PATH=~/xgl/dbuild/icd/intel
+export LIBXGL_DRIVERS_PATH=$PWD/icd/intel
 
 TEST
 ====
 
-The test executibles can be found in the build/tests directory. The tests use the Google
+The test executibles can be found in the dbuild/tests directory. The tests use the Google
 gtest infrastructure. Tests avilable so far:
 - xglinfo: Report GPU properties
 - xglbase: Test basic entry points
+- xgl_blit_tests: Test XGL Blits (copy, clear, and resolve)
 - xgl_image_tests: Test XGL image related calls needed by render_test
 - xgl_render_tests: Render a single triangle with XGL. Triangle will be in a .ppm in
 the current directory at the end of the test.
+
+DEMOS
+=====
+
+The demos executibles can be found in the dbuild/demos directory. The demos use DRI 3
+to render directly onto window surfaces.
+- tri: a textured triangle
+- cube: a textured spinning cube
+
+RENDER NODES
+============
+
+The render tests depend on access to DRM render nodes.
+To make that available, a couple of config files need to be created to set a module option
+and make accessible device files.
+The system will need to be rebooted with these files in place to complete initialization.
+These commands will create the config files.
+
+sudo tee /etc/modprobe.d/drm.conf << EOF
+# Enable render nodes
+options drm rnodes=1
+EOF
+
+sudo tee /etc/udev/rules.d/drm.rules << EOF
+# Add permissions to render nodes
+SUBSYSTEM=="drm", ACTION=="add", DEVPATH=="/devices/*/renderD*", MODE="020666"
+EOF
+