fishBMC

idefixs · 2011-01-16 01:00

Hi all!

I have started porting my sound visualisation program "fische" to XBMC. There's a first screenshot at http://26elf.at.
However, there's one question that immediately arises: how can I get a higher framerate?
CPU is at 12 percent, framerate around 10 per second, no (intentional) delays in my code

**topfs2** · 2011-01-16 01:18

Impossible to answer that without the code and the hardware and OS you are developing it on/for.

I'd suggest reading up on optmization tricks for OpenGL / DirectX / OpenGLES

jme · 2011-01-16 12:20

Looks nice!

Do you have a multicore cpu? 12% might not seem like much but if you have 8 cores or 4 cores with hyper threading enabled your actually maxing your cpu in a single threaded application. So you need to do cpu optimization or add support for multithreading.

If cpu doesnt seem to be a problem. Try disabling your blending. Does that have a high impact on the frame rate. Blending is very slow so it might and you seem to do a lot of it. Then you can try to disable other parts of the visualizer one at a time and see how the frame rate changes to pinpoint the cause. But looking though some GPU optimization guides is a good idea since there can be a lot of different bottlenecks (pixelshader, vertexshader, fillrate, texture bandwidth to name just a few). Nvidia has some good tools for it if you have a nvidia card. Not sure how well they work in XBMC though.

idefixs · 2011-01-16 13:43

Thanks you for your advice. All CPU intensive operations are multi-threaded (i.e. 4 threads on my 4-core CPU). I will be looking into OpenGL optimisations.
Here's the code that matters:

Code:

    glEnable (GL_BLEND);

    glEnable (GL_TEXTURE_2D);

    glDisable (GL_DEPTH_TEST);

    glMatrixMode (GL_PROJECTION);

    glPushMatrix();

    glLoadIdentity();

    glOrtho (-1, 1, -1, 1, -1, 1);

    glMatrixMode (GL_MODELVIEW);

    glPushMatrix();

    glLoadIdentity();

    glPolygonMode (GL_FRONT, GL_FILL);

    glBindTexture (GL_TEXTURE_2D, fishbmc_texture);

    // get a lock on the texture pixels

    while (!screenbuffer->lock())

        usleep (1);

    // update texture

    glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, configuration->width(), configuration->height(), GL_RGBA, GL_UNSIGNED_BYTE, pixels);

    screenbuffer->unlock();

    glBegin (GL_QUADS);

    glTexCoord2f (fishbmc_left, 0.0f);     glVertex3f (-1.0f, -1.0f, 1.0f);

    glTexCoord2f (fishbmc_right, 0.0f);    glVertex3f (1.0f, -1.0f, 1.0f);

    glTexCoord2f (fishbmc_right, 1.0f);    glVertex3f (1.0f, 1.0f, 1.0f);

    glTexCoord2f (fishbmc_left, 1.0f);    glVertex3f (-1.0f, 1.0f, 1.0f);

    glEnd();

    glPopMatrix();

    glMatrixMode (GL_PROJECTION);

    glPopMatrix();

idefixs · 2011-01-16 13:47

Disregard all after good morning...

The bad frame rates were caused by pulseaudio running. Works flawlessly without.

crash123 · 2011-01-17 03:19

Looks good. Keep up the good work, i'm looking forward to it.

**spiff** · 2011-01-17 10:28

neat. looks like it's just a quad so maybe some helpful chaps in here can port to dx as well..

idefixs · 2011-01-17 15:02

spiff Wrote:neat. looks like it's just a quad so maybe some helpful chaps in here can port to dx as well..

Shouldn't be any problem at all. Just a textured rectangle, nothing else.

idefixs · 2011-01-17 15:03

I noticed the "SetSetting" function never gets called - is this normal (and if so, what do I do instead to let the user choose parameters) or have I missed something?

idefixs · 2011-01-17 17:17

I have posted some more screenshots at 26elf.at

idefixs Junior Member Posts: 33 Joined: Jan 2011 Reputation: 0 Location: Austria	2011-01-16 01:00 Post: #1 Hi all! I have started porting my sound visualisation program "fische" to XBMC. There's a first screenshot at http://26elf.at. However, there's one question that immediately arises: how can I get a higher framerate? CPU is at 12 percent, framerate around 10 per second, no (intentional) delays in my code
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idefixs Junior Member Posts: 33 Joined: Jan 2011 Reputation: 0 Location: Austria	2011-01-16 13:47 Post: #5 Disregard all after good morning... The bad frame rates were caused by pulseaudio running. Works flawlessly without.
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crash123 Senior Member Posts: 258 Joined: Oct 2008 Reputation: 0 Location: New Plymouth, New Zealand	2011-01-17 03:19 Post: #6 Looks good. Keep up the good work, i'm looking forward to it.
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spiff Grumpy Bastard Developer Posts: 12,179 Joined: Nov 2003 Reputation: 82	2011-01-17 10:28 Post: #7 neat. looks like it's just a quad so maybe some helpful chaps in here can port to dx as well.. Always read the XBMC online-manual, FAQ and search the forum before posting. Do not e-mail XBMC-Team members directly asking for support. Read/follow the forum rules. For troubleshooting and bug reporting please make sure you read this first.
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idefixs Junior Member Posts: 33 Joined: Jan 2011 Reputation: 0 Location: Austria	2011-01-17 15:02 Post: #8 spiff Wrote:neat. looks like it's just a quad so maybe some helpful chaps in here can port to dx as well.. Shouldn't be any problem at all. Just a textured rectangle, nothing else.
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idefixs Junior Member Posts: 33 Joined: Jan 2011 Reputation: 0 Location: Austria	2011-01-17 15:03 Post: #9 I noticed the "SetSetting" function never gets called - is this normal (and if so, what do I do instead to let the user choose parameters) or have I missed something?
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idefixs Junior Member Posts: 33 Joined: Jan 2011 Reputation: 0 Location: Austria	2011-01-17 17:17 Post: #10 I have posted some more screenshots at 26elf.at
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