Open source GLES1/2 driver for Vivante GPU hardware.

This is being maintained as a set of patches on top of the Mesa main repository. Expect frequent rebases while in this phase of development.

To be written.

My configure script for cubox:

#!/bin/bash
DIR=... # path to target headers and libraries
ETNAVIV_BASE="${HOME}/projects/etna_viv"
ETNAVIV_LIB="${ETNAVIV_BASE}/native/etnaviv"
ETNAVIV_INC="${ETNAVIV_BASE}/native"

export TARGET="arm-linux-gnueabihf"
export CFLAGS="-I${DIR}/cubox/include -I${ETNAVIV_INC}"
export CXXFLAGS="-I${DIR}/cubox/include -I${ETNAVIV_INC}"
export LDFLAGS="-L${DIR}/cubox/lib -L${ETNAVIV_LIB}"
export LIBDRM_LIBS="-L${DIR}/cubox/lib -ldrm"

export ETNA_LIBS="-letnaviv" # important!
export LIBTOOL_FOR_BUILD="/usr/bin/libtool" # important!

./configure --target=${TARGET} --host=${TARGET} \
    --enable-gles2 --enable-gles1 --disable-glx --enable-egl --enable-dri \
    --with-gallium-drivers=swrast,etna --with-egl-platforms=fbdev \
    --enable-gallium-egl --enable-debug --with-dri-drivers=

• The etna gallium driver uses libetnaviv.a and its headers from the etna_viv project (https://github.com/laanwj/etna_viv) for access to the kernel driver and register descriptions. You only need to build libetnaviv by running make in native/etnaviv. The rest is part of the test and reverse engineering framework, and not needed for the driver.

export GCABI=v2/v4/dove/imx6/...
# rest of cross-compile target settings
cd native/etnaviv
make

• libexpat and libdrm need to be available on the target (neither is used at the moment, but they are dependencies for Mesa). In many cases these can be copied from the device, after installing the appropriate development package.

I use this script to set up the framebuffer console for (double or single buffered) rendering, as well as prevent blanking and avoid screen corruption by hiding the cursor.

#!/bin/bash
# Set to usable resolution (double buffered)
fbset 1280x1024-60 -vyres 2048 -depth 32
# Set to usable resolution (single buffered)
#fbset 1280x1024-60 -vyres 1024 -depth 32

# Disable automatic blanking
echo -e '\033[9;0]' > /dev/tty1
echo 0 > /sys/class/graphics/fb0/blank

# Disable blinking cursor
echo -e '\033[?17;0;0c' > /dev/tty1

Frequently it is useful to compare the rendering from etna to the software rasterizer; this can be done with the environment variable EGL_FBDEV_DRIVER, i.e.

# Run with etna driver
export EGL_FBDEV_DRIVER=etna
(run EGL demo...)

# Run with software rasterizer
export EGL_FBDEV_DRIVER=swrast
(run EGL demo...)

To force single buffering (without wait for vsync) use the following:

export EGL_FBDEV_BUFFERS=1

This can be useful for testing or benchmarking.

This section lists some tests and demos that can be used to exercise the driver.

A few testcases that I made especially for this driver, based on the samples from the OpenGL ES 2.0 programming guide (http://www.opengles-book.com/) can be found here:

https://github.com/laanwj/mesatest_gles

Some of the Glmark2 demos already run with this driver, but this is a work in progress.

Need a special glmark2 with fbdev support, which can be got here:

https://code.launchpad.net/~laanwj/glmark2/fbdev

Fetch:

bzr branch lp:~laanwj/glmark2/fbdev

Build:

./waf configure --with-flavors=fbdev-glesv2 --data-path=${PWD}/data
./waf

Run:

cd build/src
./glmark2-es2 -b shading -s 1280x1024 --visual-config alpha=0

Support matrix (cubox, v2, gc600):

OK:
[Scene] build    -> renders
[Scene] shading  -> renders
[Scene] texture  -> renders
[Scene] effect2d -> renders
[Scene] bump     -> renders
[Scene] desktop  -> renders
[Scene] clear    -> shows nothing (is not supposed to, either)
[Scene] pulsar   -> renders
[Scene] conditionals -> renders
[Scene] function -> renders
[Scene] jellyfish -> renders on GPUs with SQRT_TRIG

Corrupted:
[Scene] shadow   -> rendering corrupted
[Scene] buffer   -> renders, but lines are not right

Shader assertion:
[Scene] ideas    -> missing instruction KILP
[Scene] loop      -> missing loops support

Crash:
[Scene] refract   -> memory full
[Scene] terrain   -> memory full / shader too long

Mesa also comes with a few OpenGL ES 1 and 2 demos. These can be found in the following repository:

git://anongit.freedesktop.org/mesa/demos

All the demos in src/egl/opengles1 and src/egl/opengles2 with fbdev and screen backend work.

OpenGL ES 1:

• eglfbdev
• drawtex_screen
• gears_screen
• torus_screen
• tri_screen

OpenGL ES 2:

• es2gears_screen