I need vertex buffers

brianhj · January 26, 2017, 7:22pm

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?

JonnyD · January 26, 2017, 7:27pm

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).

Jonny DOn Thu, Jan 26, 2017 at 2:22 PM, brianhj wrote:

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?

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

brianhj · January 26, 2017, 7:31pm

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

Jonny D

On Thu, Jan 26, 2017 at 2:22 PM, brianhj <@brianhj (@brianhj)> wrote:
  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?
SDL mailing list
SDL at lists.libsdl.org (SDL at lists.libsdl.org)
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

brianhj · January 27, 2017, 2:43am

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.

Daniel_Gibson · January 27, 2017, 2:56am

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>

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

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

brianhj · January 27, 2017, 3:08am

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

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

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

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

Daniel_Gibson · January 27, 2017, 3:16am

Cool, glad I could help (despite never having used SDL_GPU) :-)On 27.01.2017 04:08, brianhj wrote:

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

brianhj · January 27, 2017, 3:17am

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

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

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

JonnyD · January 27, 2017, 3:23am

What numbers are you getting?

Jonny DOn Thu, Jan 26, 2017 at 10:17 PM, brianhj wrote:

If i could buy you a beer i would, i added 255 in there and it worked
fine. Thanks buddy [image: Very Happy]

Unfortunately performance with line drawing isn’t any better than play ol’
SDL [image: Sad] [image: Sad] [image: 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.

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

brianhj · January 27, 2017, 3:40am

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 <@brianhj (@brianhj)> wrote:
  If i could buy you a beer i would, i added 255 in there and it worked fine. Thanks buddy [Image: http://forums.libsdl.org/images/smiles/icon_biggrin.gif ]
Unfortunately performance with line drawing isn’t any better than play ol’ SDL [Image: http://forums.libsdl.org/images/smiles/icon_sad.gif ] [Image: http://forums.libsdl.org/images/smiles/icon_sad.gif ] [Image: http://forums.libsdl.org/images/smiles/icon_sad.gif ] 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.

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

SDL mailing list
SDL at lists.libsdl.org (SDL at lists.libsdl.org)
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

JonnyD · January 27, 2017, 4:44am

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 DOn Thu, Jan 26, 2017 at 10:40 PM, brianhj wrote:

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 [image: 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.

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

brianhj · January 27, 2017, 4:56am

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 <@brianhj (@brianhj)> wrote:
  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 [Image: http://forums.libsdl.org/images/smiles/icon_evil.gif ]
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 [Image: http://forums.libsdl.org/images/smiles/icon_biggrin.gif ]
Unfortunately performance with line drawing isn’t any better than play ol’ SDL [Image: http://forums.libsdl.org/images/smiles/icon_sad.gif ] [Image: http://forums.libsdl.org/images/smiles/icon_sad.gif ] [Image: http://forums.libsdl.org/images/smiles/icon_sad.gif ] 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.

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

SDL mailing list

http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

SDL mailing list
SDL at lists.libsdl.org (SDL at lists.libsdl.org)
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org (http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org)

brianhj · January 27, 2017, 10:47am

I just set up a simple test program. I looped through 50000 random lines and i’m only getting 33 fps

JonnyD · January 27, 2017, 12:01pm

That could be a hardware bottleneck? I’ll follow up off-list and we can
report back when settled.

Jonny DOn Friday, January 27, 2017, brianhj wrote:

I just set up a simple test program. I looped through 50000 random lines
and i’m only getting 33 fps [image: Sad]

Ed_Phillips · January 27, 2017, 4:13pm

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,

EdOn Fri, 27 Jan 2017, Jonathan Dearborn wrote: