accel(6) Svgalib User Manual accel(6)NAMEaccel - tests the new style svgalib accelerator interface
SYNOPSISaccelDESCRIPTION
Test new-style accelerated functions (As of this writing: Ark, Cirrus,
Chips & Technologies cards, and Mach32 only). For other cards the demo
will not work (well it will complain about missing accelerator sup‐
port). Don't worry about this.
During the development of the Mach32 new style driver for 1.2.12, this
demo was massively extended to check the Mach32 functions.
Upon startup it lists all supported SVGA modes and asks you to enter a
number identifying the mode to be tested. The supported subfunctions of
vga_accel(3) in this mode are listed and the demo instructs to press
<Return> to start the demos.
If supported, all drawing operations are performed in the background.
Then the following tests are performed:
Positioning tests
These tests were originally intended to check that the accelerator com‐
mands work on the proper screen locations. The screen shows 12 (4 x 3)
smaller areas with red crosses in the corners. When everything is ok,
the drawings should reach right in the corners of the crosses.
A given card may not support all operations listed here. In that case
the resp. test area just shows the red crosses. For tests performed,
the name of the test is printed below the area. The tests are (from
left to right, top to bottom):
1. A green box is drawn with vga_accel(ACCEL_FILLBOX).
2. A cross of green lines is drawn with vga_accel(ACCEL_DRAWLINE).
3. A linux pixmap just fitting into the crosses is drawn with
vga_accel(ACCEL_PUTIMAGE).
4. A pixmap just fitting into the crosses is drawn into the red
crosses (by vgagl(5) which may or may not use the accelerator).
The pixmap is then copied to a few lines/columns below. Green
crosses mark the intended destination position.
5. Works like 3. but copies to an area above the origin. The accel‐
erator must ensure that the overlapping areas are handled non
corrupting. Thus, watch that the copy operation is properly per‐
formed.
6. A green triangle is drawn above the top/left to bottom/right
diagonal by use of vga_accel(ACCEL_DRAWHLINELIST).
7. Certain bitmaps are copied to the screen. In the corners you'll
see the digits
0 top/left, green on red.
1 top/right, red on green.
2 bottom/left, black on white.
3 bottom/right, white on black. Note that some black bor‐
der, not the digit will be aligned to the red crosses.
Finally, a yellow wizard image is drawn into the center.
The bit ordering for bitmaps is a bit weird. Please check that
the digits are not mirrored or flipped.
8. This time bitmap transparency is tested by drawing wizard images
onto the aforementioned linux pixmap (left to right, top to bot‐
tom) in yellow, red, green, and cyan. The background of the yel‐
low wizard is masked out by a black border bitmap. Note that
the wizard will not reach into the red corners because the bit‐
map has some (transparent) border.
9. The text below this box is copied as a monochrome bitmap from
the screen into the corners listed under 7. in the same colors.
10. Two green rectangles with an edge cut out from the bottom is
drawn using vga_accel(ACCEL_POLYLINE).Thereisanintendedbugwhich‐
drawsthecenterofthe top line twice. If supported, the lower rec‐
tangle is drawn in cyan and with the xor raster operation s.t.
the buggy point is not drawn thus leaving a pin hole.
11. vga_accel(ACCEL_POLYHLINE)isusedtodrawsomegreenlineswhich‐
makesthisarealook like a green box with a cut out, black M-style
shape.
12. A weird green polygon is filled in red with
vga_accel(ACCEL_POLYFILLMODE) using the techniques given in
vga_accel(3). This needs some offscreen memory. If VGA memory
is tight in that resolution the test cannot be performed.
After this screen, you'll have to hit <Return> to continue.
Raster operations
Again, red cross bordered areas are drawn on the screen, this time for
each of the supported raster operations. For ROP_AND and ROP_XOR the
areas are filled in white first.
Three overlapping boxes A, B, C are drawn such that you see the follow‐
ing areas.
AAAAAAddddBBBBBB
AAAAAAddddBBBBBB
AAAAAAddddBBBBBB
AAAAeeggggffBBBB
AAAAeeggggffBBBB
AAAAeeggggffBBBB
CCCCCCCC
CCCCCCCC
CCCCCCCC
The pictures should show:
1. Replace mode. A, B, C are red, green, blue. They just overlap,
yielding d - green and e, f, g - blue.
2. The colors mix using ROP_OR (and a nice color table). The over‐
lapping areas become the additive color mix: d - yellow, e -
magenta, f - cyan, and g - white.
3. ROP_AND is used. The background is filled white first, s.t.
there is something in video memory to and with non trivially. We
have A, B, C in cyan, magenta, yellow and d, e, f, g in blue,
green, red, black.
4. ROP_XOR is used and the background filled white first too. A, B,
C are red, green, blue again, but the overlapping areas d, e, f,
g become blue, green, red, white.
5. ROP_INV is used, s.t. A, B, C are all white and d, e, f, g
become black, black, black, white. Note that this is not done
by using ROP_XOR and drawing A, B, C in white. Instead A, B, C
are drawn in the usual
red, green, blue. However, the accelerator just inverts the
memory contens.
If the accelerator supports raster operations for ACCEL_DRAWHLINELIST
actually disks (well, ellipses) are drawn instead of boxes.
After this screen, you'll have to hit <Return> to continue.
Replace QuixDemo
If ACCEL_DRAWLINE is supported, a Quix like bouncing series of lines in
varying colors is drawn. The lines are removed from the screen by over‐
drawing them in black, thus erasing the dots and text on the back‐
ground.
The test lasts about 5 seconds and some statistics are printed to std‐
out.
XOR Mode QuixDemo
As before, but this time all lines are drawn in ROP_XOR mode (if
ACCEL_DRAWLINE supports raster operations). Thus the background will
not be destroyed this time.
The test lasts about 5 seconds and some statistics are printed to std‐
out.
FillBox Demo
The screen is ACCEL_FILLBOX filled with a series of boxes of increasing
colors. In truei/high color modes you'll probably only see a series of
varying blue tones (because these are at the beginning of the color ta‐
ble and there are soo many of them).
The test lasts about 5 seconds and some statistics are printed to std‐
out.
ScreenCopy Demo
Some random dots are drawn on the screen and thirds of the screen con‐
tents are moved around using ACCEL_SCREENCOPY.
The test lasts about 5 seconds and some statistics are printed to std‐
out.
Scroll Demo
Some random dots are drawn on the screen and moved one line up with
ACCEL_SCREENCOPY. In offscreen memory a new line is prepared which
will be cleared by ACCEL_FILLBOXandmoveinfrombelow.Thistestrequires‐
someoffscreenandwillnot be performed if video memory is very tight.
The test lasts about 5 seconds and some statistics are printed to std‐
out.
FillBox with DrawHLineList Demo
Like the FillBox test, but no box fill is done but the screen is filled
with a list of horizontal lines drawn with ACCEL_DRAWHLINELIST.
The test lasts about 5 seconds and some statistics are printed to std‐
out.
FillBox XOR Mode Demo
Like the FillBox test, but the XOR raster operation is used.
The test lasts about 5 seconds and some statistics are printed to std‐
out.
PutBitmap Demo
The screen is filled with bitmasks consisting of tiny vertical lines
alternating in red and blue.
The test lasts about 5 seconds and some statistics are printed to std‐
out.
SOME DATAPOINTS
Here is a list of speed listings for some cards. Please keep in mind
that also the calling overhead for the program is measured. This seems
to be esp. true for the QuixDemo.
Results on a Cirrus GD5434-E with 2Mb:
640x480x256 60 Hz
FillBox: 200.3 Mpixels/s (200.3 Mbytes/s)
ScreenCopy: 51.0 Mpixels/s (51.0 Mbytes/s)
Scroll Demo: 50.5 Mpixels/s (50.5 Mbytes/s)
FillBox XOR: 83.2 Mpixels/s (83.2 Mbytes/s)
320x200x256 70 Hz
FillBox: 200.1 Mpixels/s (200.1 Mbytes/s)
ScreenCopy: 52.3 Mpixels/s (52.3 Mbytes/s)
Scroll Demo: 51.2 Mpixels/s (51.2 Mbytes/s)
FillBox XOR: 87.1 Mpixels/s (87.1 Mbytes/s)
640x480x32K 60 Hz
FillBox: 90.9 Mpixels/s (181.8 Mbytes/s)
ScreenCopy: 23.1 Mpixels/s (46.3 Mbytes/s)
Scroll Demo: 23.0 Mpixels/s (46.1 Mbytes/s)
FillBox XOR: 37.2 Mpixels/s (74.5 Mbytes/s)
640x480x16M (32-bit) 60 Hz
FillBox: 35.5 Mpixels/s (142.3 Mbytes/s)
ScreenCopy: 9.3 Mpixels/s (37.3 Mbytes/s)
Scroll Demo: 9.2 Mpixels/s (37.1 Mbytes/s)
FillBox XOR: 14.6 Mpixels/s (58.6 Mbytes/s)
On a Cirrus Logic 5426 VLB (50 MHz MCLK):
640x480x256 60 Hz
FillBox: 32.8 Mpixels/s (32.8 Mbytes/s)
ScreenCopy: 16.4 Mpixels/s (16.4 Mbytes/s)
Scroll Demo: 16.3 Mpixels/s (16.3 Mbytes/s)
FillBox XOR: 16.5 Mpixels/s (16.5 Mbytes/s)
640x480x32K 60 Hz
FillBox: 12.2 Mpixels/s (24.4 Mbytes/s)
ScreenCopy: 6.1 Mpixels/s (12.2 Mbytes/s)
Scroll Demo: 6.0 Mpixels/s (12.1 Mbytes/s)
FillBox XOR: 6.1 Mpixels/s (12.2 Mbytes/s)
Tweaked to 60 MHz MCLK:
640x480x256 60 Hz
FillBox: 42.1 Mpixels/s (42.1 Mbytes/s)
ScreenCopy: 21.0 Mpixels/s (21.0 Mbytes/s)
Scroll Demo: 20.9 Mpixels/s (20.9 Mbytes/s)
FillBox XOR: 21.1 Mpixels/s (21.1 Mbytes/s)
640x480x32K 60 Hz
FillBox: 16.7 Mpixels/s (33.5 Mbytes/s)
ScreenCopy: 8.3 Mpixels/s (16.7 Mbytes/s)
Scroll Demo: 8.3 Mpixels/s (16.7 Mbytes/s)
FillBox XOR: 8.3 Mpixels/s (16.7 Mbytes/s)
Results on a Mach32 EISA with 2Mb VRAM:
1280x1024x256 60 Hz
Replace QuixDemo: 12.1 Klines/s (6.7 Mpixels/s or 6.7 Mbytes/s)
Xor QuixDemo: 9.9 Klines/s (5.1 Mpixels/s or 5.1 Mbytes/s)
FillBox: 75.4 Mpixels/s (75.4 Mbytes/s)
ScreenCopy: 26.4 Mpixels/s (26.4 Mbytes/s)
Scroll Demo: 28.7 Mpixels/s (28.7 Mbytes/s)
FillBox with DrawHlineList: 73.1 Mpixels/s (73.1 Mbytes/s)
FillBox XOR: 37.9 Mpixels/s (37.9 Mbytes/s)
PutBitmap: 15.6 Mpixels/s (15.6 Mbytes/s)
1024x768x64K 72Hz
Replace QuixDemo: 12.3 Klines/s (5.2 Mpixels/s or 10.5 Mbytes/s)
Xor QuixDemo: 9.0 Klines/s (5.1 Mpixels/s or 10.3 Mbytes/s)
FillBox: 37.6 Mpixels/s (75.2 Mbytes/s)
ScreenCopy: 13.2 Mpixels/s (26.4 Mbytes/s)
Scroll Demo: 13.2 Mpixels/s (26.4 Mbytes/s)
FillBox with DrawHlineList: 37.0 Mpixels/s (74.0 Mbytes/s)
FillBox XOR: 18.9 Mpixels/s (37.8 Mbytes/s)
PutBitmap: 15.2 Mpixels/s (30.5 Mbytes/s)
You're encouraged to send in more data. This demo is part of svgalib
and can be found in the demos/ subdirectory of the original svgalib
distribution. However, it is not installed in the system by default,
s.t. it is unclear where you can find it if your svgalib was installed
by some linux distribution. Even then, when you have the demo on your
system, you probably won't have the sources s.t. it is only of limited
use for you.
In case of any such problem, simply get an svgalib distribution from
the net. You even don't need to install it. Just make in the demos/
subdirecty. As of this writing, svgalib-1.2.12.tar.gz is the latest
version and can be retrieved by ftp from sunsite.unc.edu at
/pub/Linux/libs/graphics and tsx-11.mit.edu at /pub/linux/sources/libs
which will most probably be mirrored by a site close to you.
SEE ALSOsvgalib(7), vgagl(7), libvga.config(5), vga_accel(3), threed(6),
bg_test(6), eventtest(6), forktest(6), fun(6), keytest(6),
mousetest(6), scrolltest(6), speedtest(6), spin(6), testaccel(6),
testgl(6), testlinear(6), vgatest(6), plane(6), wrapdemo(6)AUTHOR
This manual page was edited by Michael Weller <eowmob@exp-math.uni-
essen.de>. The demo and most of its documentation is due to Harm Hane‐
maayer <H.Hanemaayer@inter.nl.net>.
Svgalib (>= 1.2.11) 29 July 1997 accel(6)
