@@ -1 +1,2 @@
+*.data
 *.png
@@ -1,6 +1,15 @@
 /*
 Framebuffer device /dev/fb0
 
+Adapted from:
+http://stackoverflow.com/questions/4996777/paint-pixels-to-screen-via-linux-framebuffer
+
+More examples:
+
+- https://github.com/prpplague/fb-test-app
+- https://gist.github.com/robmint/4753401
+- http://stackoverflow.com/a/14809058/895245
+
 https://en.wikipedia.org/wiki/Linux_framebuffer
 
 To run this, you must:
@@ -13,10 +22,9 @@ To run this, you must:
 
 Expected outcome: pink square is printed on screen.
 If any terminal text scrolls over it, those square get overwritten.
-Get rid of terminal for good: http://stackoverflow.com/questions/32620019/c-linux-how-to-takeover-the-framebuffer
-
-Adapted from:
-http://stackoverflow.com/questions/4996777/paint-pixels-to-screen-via-linux-framebuffer
+Get rid of terminal for good:
+- http://stackoverflow.com/questions/32620019/c-linux-how-to-takeover-the-framebuffer
+- http://stackoverflow.com/questions/14805294/using-linux-framebuffer-for-graphics-but-disabling-console-text
 
 Other things to try:
 
 
@@ -9,15 +9,6 @@ There is a certain "installable client driver loader (ICD loader)" which forward
 <http://www.x.org/wiki/XorgEVoC/GalliumCompute/>
 
 Looks like the major open source implementation.
-
-## pocl
-
-Portable OpenCL implementation.
-
-<https://github.com/pocl/pocl>
-
-<http://portablecl.org/>
-
 MIT and LLVM based.
 
 ## NVIDIA
@@ -44,15 +35,36 @@ Threads:
 
 ## Intel
 
+<http://stackoverflow.com/questions/19141272/opencl-implementation-for-intel-core-i5-linux>
+
 No official Linux packages.
 
 - <http://askubuntu.com/questions/545763/installation-of-intel-opencl>
 - <http://askubuntu.com/questions/629456/intel-opencl-on-14-04>
 
+Beignet looks like an open source implementation for Intel's embedded GPU: <https://www.freedesktop.org/wiki/Software/Beignet/> TODO reversed or documented?
+
 ## Altera FPGA
 
 <https://www.altera.com/products/design-software/embedded-software-developers/opencl/overview.html>
 
 ## Transpiler
 
 - <http://repo.or.cz/w/ppcg.git> C99 to OpenCL.
+
+## CPU implementations
+
+Slow but portable, and a sanity check that OpenCL is actually making anything faster:
+
+### Clover
+
+- <https://people.freedesktop.org/~steckdenis/clover/>
+
+### pocl
+
+Portable OpenCL implementation.
+
+<https://github.com/pocl/pocl>
+
+<http://portablecl.org/>
+
@@ -6,6 +6,8 @@
         1.  [GLUT](glut.md)
     1.  [Lightning](lightning.md)
         1. [Ray tracing](ray-tracing.md)
+    1.  [Benchmarks](benchmarks.md)
+    1.  [Drivers](drivers.md)
 1.  Examples
     1.  [GLUT hello world](hello_world.c)
     1.  [info](info.c)
@@ -46,8 +48,7 @@
             1.  [Infinite loop shader](glfw_infinite_loop_shader.c.off)
             1.  [Memory overflow shader](glfw_memory_overflow_shader.c.off)
     1.  [GLX](glx.c)
-    1.  Performance
-        1.  [Many triangles](many_triangles.c)
+    1.  Benchmarks
         1.  [Many triangles animation](many_triangles_animation.c)
 1.  [main](main.cpp)
 1.  Mini projects
 
@@ -0,0 +1,15 @@
+# Benchmarks
+
+Since the raison d'etre of OpenGL is to have high performance, you will want to know how your application performs compared to some standardized benchmarks.
+
+- <http://askubuntu.com/questions/31913/how-to-perform-a-detailed-and-quick-3d-performance-test>
+
+Free:
+
+- `glxgears`. `es2gears` from Ubuntu 16.04 `mesa-utils-extra` is an GLES2 implementation.
+- `glmark2`. Maintained by Linaro.
+- `phoronix`
+
+Non free:
+
+- GFXBench: <https://gfxbench.com/result.jsp>
@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+# Tested on Ubuntu 16.04.
 sudo aptitude update
 # Ubuntu 14.04: glfw3 not present in repos, only glfw 2.
+# Must compile yourself, good luck: http://stackoverflow.com/questions/17768008/how-to-build-install-glfw-3-and-use-it-in-a-linux-project
 sudo aptitude install -y freeglut3-dev libglfw3-dev libglew-dev libopencv-dev