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I need vertex buffers
brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Thu Jan 26, 2017 7:22 pm
I need vertex buffer objects but I HATE opengl. Will SDL ever get this feature? Or is there some way to draw 15,000 lines per frame at 60fps with SDL?
I need vertex buffers
Jonny D


Joined: 12 Sep 2009
Posts: 932
Post Posted: Thu Jan 26, 2017 7:27 pm
If you don't actually need VBO access, but just want the perf benefit, SDL_gpu can draw plenty of lines (because it does use VBOs to do batching).

https://github.com/grimfang4/sdl-gpu



Jonny D




On Thu, Jan 26, 2017 at 2:22 PM, brianhj wrote:
Quote:
I need vertex buffer objects but I HATE opengl. Will SDL ever get this feature? Or is there some way to draw 15,000 lines per frame at 60fps with SDL?


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Re: I need vertex buffers
brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Thu Jan 26, 2017 7:31 pm
Does this work with SDL2? Does it match the performance of OpenGL VBO? If so then yes this is exactly what i need

Thanks!!!


Jonny D wrote:
If you don't actually need VBO access, but just want the perf benefit, SDL_gpu can draw plenty of lines (because it does use VBOs to do batching).

https://github.com/grimfang4/sdl-gpu



Jonny D




On Thu, Jan 26, 2017 at 2:22 PM, brianhj wrote:
Quote:
I need vertex buffer objects but I HATE opengl. Will SDL ever get this feature? Or is there some way to draw 15,000 lines per frame at 60fps with SDL?


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brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Fri Jan 27, 2017 2:43 am
Unfortunately I can't even get a simple program to work:

Code:
#include "SDL.h"
#include "SDL_gpu.h"

void main_loop(GPU_Target* screen) {
   while (true) {
      GPU_Clear(screen);
      GPU_Line(screen, 0.f, 0.f, 123.f, 123.f, SDL_Color({ 123,255,255 }));
      GPU_Flip(screen);
   }
}

int main(int argc, char* argv[])
{
   GPU_Target* screen;

   screen = GPU_Init(800, 600, GPU_DEFAULT_INIT_FLAGS);
   if (screen == NULL)
      return -1;

   main_loop(screen);

   GPU_Quit();

   return 0;
}



Any ideas??? It's just a black screen. I used strange coords and colors to make sure I was sane.
I need vertex buffers
Daniel Gibson
Guest
Post Posted: Fri Jan 27, 2017 2:56 am
Your color only has 3 components, the 4th (alpha) might be set to 0
because of this, making the line totally translucent (invisible)?
try something like SDL_Color c = {123, 255, 255, 255}; and use that in
the GPU_Line() call.

Cheers,
Daniel

Quote:


Any ideas??? It's just a black screen. I used strange coords and colors
to make sure I was sane.


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Re: I need vertex buffers
brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Fri Jan 27, 2017 3:08 am
If i could buy you a beer i would, i added 255 in there and it worked fine. Thanks buddy :D

Daniel Gibson wrote:
Your color only has 3 components, the 4th (alpha) might be set to 0
because of this, making the line totally translucent (invisible)?
try something like SDL_Color c = {123, 255, 255, 255}; and use that in
the GPU_Line() call.

Cheers,
Daniel

Quote:


Any ideas??? It's just a black screen. I used strange coords and colors
to make sure I was sane.


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I need vertex buffers
Daniel Gibson
Guest
Post Posted: Fri Jan 27, 2017 3:16 am
Cool, glad I could help (despite never having used SDL_GPU) :-)

On 27.01.2017 04:08, brianhj wrote:
Quote:
If i could buy you a beer i would, i added 255 in there and it worked
fine. Thanks buddy Very Happy

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Re: I need vertex buffers
brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Fri Jan 27, 2017 3:17 am
If i could buy you a beer i would, i added 255 in there and it worked fine. Thanks buddy :D

Unfortunately performance with line drawing isn't any better than play ol' SDL Sad Sad Sad Very disappointed

Daniel Gibson wrote:
Your color only has 3 components, the 4th (alpha) might be set to 0
because of this, making the line totally translucent (invisible)?
try something like SDL_Color c = {123, 255, 255, 255}; and use that in
the GPU_Line() call.

Cheers,
Daniel

Quote:


Any ideas??? It's just a black screen. I used strange coords and colors
to make sure I was sane.


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I need vertex buffers
Jonny D


Joined: 12 Sep 2009
Posts: 932
Post Posted: Fri Jan 27, 2017 3:23 am
What numbers are you getting?

Jonny D


On Thu, Jan 26, 2017 at 10:17 PM, brianhj wrote:
Quote:
If i could buy you a beer i would, i added 255 in there and it worked fine. Thanks buddy

Unfortunately performance with line drawing isn't any better than play ol' SDL Very disappointed




Daniel Gibson wrote:

Your color only has 3 components, the 4th (alpha) might be set to 0
because of this, making the line totally translucent (invisible)?
try something like SDL_Color c = {123, 255, 255, 255}; and use that in
the GPU_Line() call.

Cheers,
Daniel




Quote:



Any ideas??? It's just a black screen. I used strange coords and colors
to make sure I was sane.


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Re: I need vertex buffers
brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Fri Jan 27, 2017 3:40 am
Well I have 25 sets of lines, each with 466 lines. That's 11650 lines per frame or 699000 lines per second at 60fps.

SDL + SDL_gpu using GPU_line i get 17 FPS
SDL + OpenGL + VBO i get 60 FPS, capped by monitor i think

I just fucking hate programming in OpenGL. Every little think you need to do is a fucking science project Evil or Very Mad


Jonny D wrote:
What numbers are you getting?

Jonny D


On Thu, Jan 26, 2017 at 10:17 PM, brianhj wrote:
Quote:
If i could buy you a beer i would, i added 255 in there and it worked fine. Thanks buddy

Unfortunately performance with line drawing isn't any better than play ol' SDL Very disappointed




Daniel Gibson wrote:

Your color only has 3 components, the 4th (alpha) might be set to 0
because of this, making the line totally translucent (invisible)?
try something like SDL_Color c = {123, 255, 255, 255}; and use that in
the GPU_Line() call.

Cheers,
Daniel




Quote:



Any ideas??? It's just a black screen. I used strange coords and colors
to make sure I was sane.


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I need vertex buffers
Jonny D


Joined: 12 Sep 2009
Posts: 932
Post Posted: Fri Jan 27, 2017 4:44 am
If you want to troubleshoot this, we can take it off-list.  On a Macbook Pro, I'm getting 30fps rendering 10x that number of lines (>100,000) each frame.

Jonny D




On Thu, Jan 26, 2017 at 10:40 PM, brianhj wrote:
Quote:
Well I have 25 sets of lines, each with 466 lines. That's 11650 lines per frame or 699000 lines per second at 60fps.

SDL + SDL_gpu using GPU_line i get 17 FPS
SDL + OpenGL + VBO i get 60 FPS, capped by monitor i think

I just fucking hate programming in OpenGL. Every little think you need to do is a fucking science project





Jonny D wrote:

What numbers are you getting?

Jonny D


On Thu, Jan 26, 2017 at 10:17 PM, brianhj <> wrote:



Quote:

If i could buy you a beer i would, i added 255 in there and it worked fine. Thanks buddy

Unfortunately performance with line drawing isn't any better than play ol' SDL Very disappointed




Daniel Gibson wrote:

Your color only has 3 components, the 4th (alpha) might be set to 0
because of this, making the line totally translucent (invisible)?
try something like SDL_Color c = {123, 255, 255, 255}; and use that in
the GPU_Line() call.

Cheers,
Daniel




Quote:



Any ideas??? It's just a black screen. I used strange coords and colors
to make sure I was sane.


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Re: I need vertex buffers
brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Fri Jan 27, 2017 4:55 am
Ok that would be great!!!

Jonny D wrote:
If you want to troubleshoot this, we can take it off-list.  On a Macbook Pro, I'm getting 30fps rendering 10x that number of lines (>100,000) each frame.

Jonny D




On Thu, Jan 26, 2017 at 10:40 PM, brianhj wrote:
Quote:
Well I have 25 sets of lines, each with 466 lines. That's 11650 lines per frame or 699000 lines per second at 60fps.

SDL + SDL_gpu using GPU_line i get 17 FPS
SDL + OpenGL + VBO i get 60 FPS, capped by monitor i think

I just fucking hate programming in OpenGL. Every little think you need to do is a fucking science project





Jonny D wrote:

What numbers are you getting?

Jonny D


On Thu, Jan 26, 2017 at 10:17 PM, brianhj <> wrote:



Quote:

If i could buy you a beer i would, i added 255 in there and it worked fine. Thanks buddy

Unfortunately performance with line drawing isn't any better than play ol' SDL Very disappointed




Daniel Gibson wrote:

Your color only has 3 components, the 4th (alpha) might be set to 0
because of this, making the line totally translucent (invisible)?
try something like SDL_Color c = {123, 255, 255, 255}; and use that in
the GPU_Line() call.

Cheers,
Daniel




Quote:



Any ideas??? It's just a black screen. I used strange coords and colors
to make sure I was sane.


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brianhj


Joined: 17 Jan 2010
Posts: 14
Post Posted: Fri Jan 27, 2017 10:47 am
I just set up a simple test program. I looped through 50000 random lines and i'm only getting 33 fps Sad
I need vertex buffers
Jonny D


Joined: 12 Sep 2009
Posts: 932
Post Posted: Fri Jan 27, 2017 12:01 pm
That could be a hardware bottleneck?  I'll follow up off-list and we can report back when settled.

Jonny D


On Friday, January 27, 2017, brianhj wrote:
Quote:
I just set up a simple test program. I looped through 50000 random lines and i'm only getting 33 fps

I need vertex buffers
Ed Phillips
Guest
Post Posted: Fri Jan 27, 2017 4:13 pm
On Fri, 27 Jan 2017, Jonathan Dearborn wrote:

Quote:
That could be a hardware bottleneck?  I'll follow up off-list and we can report back when settled.
Jonny D

That would be great... these kinds of performance cases are interesting to
me.

Thanks,

Ed
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