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OpenGL Vertex Array Object + Direct State Access

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As a disclaimer I am really not versed in OpenGL. I am trying to convert the following to use DSA:

glBindVertexArray(vao);
 
glBindBuffer(GL_ARRAY_BUFFER, vertex_attrib_buffers[0]);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
 
glBindBuffer(GL_ARRAY_BUFFER, vertex_attrib_buffers[1]);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, NULL);

glBindBuffer(GL_ARRAY_BUFFER, vertex_attrib_buffers[2]);
glVertexAttribPointer(2, 3, GL_UNSIGNED_BYTE, GL_TRUE, 0, NULL);

glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glEnableVertexAttribArray(2);

I have found the following functions:

glVertexArrayBindVertexBufferEXT()
glVertexArrayVertexAttribBindingEXT()
glVertexArrayVertexAttribFormatEXT()
glEnableVertexArrayAttribEXT()

but I am unsure of how to use them. I can find almost nothing about them online.

Edited by Chris_F

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These are described in the actual DSA extension: http://www.opengl.org/registry/specs/EXT/direct_state_access.txt

You can get arguments and their names from that site.

 

If you are unsure, the usual approach is that whatever you call in a Bind function (BindVertexArray, BindTexture) becomes the first parameters of the DSA call. The other parameters are then the exact same parameters that you would use in a non-DSA function. 

 

Also take a look at this: http://www.g-truc.net/post-0363.html

 

Keep in mind that when working with vertex array objects, there is one thing you cannot do with DSA and must use the old way: http://stackoverflow.com/questions/3776726/how-to-bind-a-element-buffer-array-to-vertex-array-object-using-direct-state-a

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Keep in mind that when working with vertex array objects, there is one thing you cannot do with DSA and must use the old way: http://stackoverflow.com/questions/3776726/how-to-bind-a-element-buffer-array-to-vertex-array-object-using-direct-state-a

 

Wow, that is strange. I take it they accidentally left something like this out of the spec for some reason?

void glVertexArrayBindElementArrayBufferEXT(GLuint vao, GLuint buffer)

I guess it would be easy enough to implement on your own...

 

 

 


Move back to VBO’s.

 

OK, I'm confused now. I thought that VAOs were not optional in modern OpenGL. By "don't use VAOs," do you mean only use a single VAO and just keep modifying that one? Also, is it "vertex attribute object" or "vertex array object," or are those actually two distinct things?

Edited by Chris_F

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I'm confused as well.

I have 300 VBOs, give or take, that all have the same attributes. Hence why I chose VAOs because they remember my attribute bindings.

 

My reasoning is that I only end up with 2 calls to render something:

glBindVertexArray(vao);

glDraw...();

 

What is the correct course of action here?

Edited by Kaptein

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do you mean only use a single VAO and just keep modifying that one?

I definitely don’t mean that; that would be the worst-case scenario possible.

And they are not required as far as I know; the very fact that they appear in your list of functions as extensions means in any case you definitely are not strictly required to use them, and since they build on top of basic VBO functionality I doubt they will ever be strictly required.


Also, is it "vertex attribute object" or "vertex array object,"

Vertex Array Objects.

 

Hence why I chose VAOs because they remember my attribute bindings.

Or you could just set the attribute states once manually and render all of your VBO’s; that would be faster, especially if you are re-binding the VAO for each draw.

 

What is the correct course of action here?

Until VAO performance meets standards, the generally accepted course is to use raw VBO’s.
And if you emulate VAO functionality manually with a layer to remove redundant state changes (something you should be doing no matter what) a VAO will likely never be as fast as your manual setup calls.


L. Spiro Edited by L. Spiro

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I definitely don’t mean that; that would be the worst-case scenario possible.

 

And they are not required as far as I know;

 

I am even more confused now. Can you point me to an example of how to render with just VBOs and no VAO?

 

Edit: Are you talking about using functions like glVertexPointer in conjunction with VBOs? If so I should point out that all of that has been deprecated and is not even available in core profile as far as I know.

 

 


the very fact that they appear in your list of functions as extensions means in any case you definitely are not strictly required to use them, and since they build on top of basic VBO functionality I doubt they will ever be strictly required.

 

DSA is an extension, not VAOs. VAOs are core functionality.

Edited by Chris_F

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VAOs are certainly NOT a requirement for OpenGL... god, if it was, the horror... something you HAD to use with a bind-to-edit model... sweet jesus.

The commands you'd be after, based on the GL4.4 reference card, are those such as glVertexAttribPointer and friends ( http://www.opengl.org/wiki/Category:Core_API_Ref_Vertex_Arrays ) which allow you to setup buffer input via attributes on the shaders.

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VAOs are certainly NOT a requirement for OpenGL... god, if it was, the horror... something you HAD to use with a bind-to-edit model... sweet jesus.

The commands you'd be after, based on the GL4.4 reference card, are those such as glVertexAttribPointer and friends ( http://www.opengl.org/wiki/Category:Core_API_Ref_Vertex_Arrays ) which allow you to setup buffer input via attributes on the shaders.

 

Then how do you render in GL 3.3/4.x core profile without a VAO? I was under the impression that glVertexAttribPointer was only for VAOs.

 

EDIT: Just removed my VAO, bound my buffers, called glVertexAttribPointer and all I have is a black screen.

Edited by Chris_F

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I also tried using glVertexAttribPointer without VAOs and it simply didn't work.

How about a simple pseudo code example? :)

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To go one wiki page further, under glVertexAttribPointer: "GL_INVALID_OPERATION? is generated if no vertex array object is bound."

 

The following thread is also relevant, but nobody explicitly says anything like "yes, I've fallen back to older GLSL and non-generic attributes":

http://www.gamedev.net/topic/649916-valve-opengl-tips-and-tricks/

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To go one wiki page further, under glVertexAttribPointer: "GL_INVALID_OPERATION? is generated if no vertex array object is bound."

 

The following thread is also relevant, but nobody explicitly says anything like "yes, I've fallen back to older GLSL and non-generic attributes":

http://www.gamedev.net/topic/649916-valve-opengl-tips-and-tricks/

 

Also, here http://www.opengl.org/wiki_132/index.php/Vertex_Rendering#Prerequisites

 

VAO is mandatory. Just not for people who are using compatibility mode with deprecated functionality apparently.

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Upon slightly more careful reading of the Red Book it seems this is the case... well played GL, well played.

I guess this will make sense once the ARB_multi_bind extension is common as you can use VAOs for VB attributes (types, stride etc) and use multi-bind to replace all the buffer bindings in one shot... either based on the performance and usage case issues I'd pretty much only use it for that right now; bind the attributes to a VAO (probably drag it around with my materials/shaders) and just over write the buffer bindings as required.

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ARB_vertex_attrib_binding also helps make VAOs make more sense - you can set up your formats, layouts, strides, etc in a VAO and then just bind the VAO and replace the buffers as required.  This is a better match to the common usage pattern of having the same vertex format but different buffers.

 

Unfortunately vertex attrib binding is not commonly supported either (thanks a lot, AMD and Intel).

 

The first 3 functions mentioned in the OP are part of ARB_vertex_attrib_binding and are documented with that extension.

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ARB_vertex_attrib_binding also helps make VAOs make more sense - you can set up your formats, layouts, strides, etc in a VAO and then just bind the VAO and replace the buffers as required.  This is a better match to the common usage pattern of having the same vertex format but different buffers.

 

Unfortunately vertex attrib binding is not commonly supported either (thanks a lot, AMD and Intel).

 

The first 3 functions mentioned in the OP are part of ARB_vertex_attrib_binding and are documented with that extension.

 

Luckily I'm targeting OpenGL 4.3+ so I have access to ARB_vertex_attrib_binding as a core feature.

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So, it turns out that you might want to be using VAOs after all....

http://www.openglsuperbible.com/2013/12/09/vertex-array-performance/

Which makes me wonder what Valve were doing to come to their conclusion, or maybe NV's Linux drivers just suck more than the Windows ones in this respect (NV benchmark pretty poorly in the above link too compared to AMD)

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The linux drivers for both AMD and Nvidia aren't as mature as their windows counterparts. It might be that it's just a collection of performance tips relating specially to linux. There is no viable alternative to VAOs though, which is why we are all so confused. You can't skip VAOs because you often have 300 VBOs with the same attribs, and attribs aren't remembered for VBOs, or anything else, except VAOs.

Note: I have had better performance on Linux overall though!

 

OpenGL is a bit ...-backwards sometimes.

You ideally just "enable" your 5 attribs, and then proceed to render 300 VBOs. You can't. It sucks. sad.png

Instead I have to create 300 VAOs, with 5 "enabled" attribs each. Then render 300 VAOs.

 

The madness stops at GL 4.x (from superbible):

"However, these functions were introduced in OpenGL 4.3 and so may not have widespread support just yet, whereas VAO has been in core OpenGL since version 3.0"

 

What were they thinking?

Edited by Kaptein

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So, it turns out that you might want to be using VAOs after all....

http://www.openglsuperbible.com/2013/12/09/vertex-array-performance/

Which makes me wonder what Valve were doing to come to their conclusion, or maybe NV's Linux drivers just suck more than the Windows ones in this respect (NV benchmark pretty poorly in the above link too compared to AMD)

I would like to see his benchmarks when he is not redundantly calling glEnableVertexAttribArray() and glDisableVertexAttribArray().

 

 

L. Spiro

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There is no viable alternative to VAOs though, which is why we are all so confused.

Cross-platform, no. But on NVidia, bindless can easily exceed the performance you get from VAOs, and the reason is intuitive.

You ideally just "enable" your 5 attribs, and then proceed to render 300 VBOs. You can't. It sucks.

Instead I have to create 300 VAOs, with 5 "enabled" attribs each. Then render 300 VAOs.

No you don't. Having a bazillion little VAOs floating around with all the cache misses that go with them isn't necessarily the best approach. Best case, use bindless (does an end-run around the cache issues, but is NV-only) or a streaming VBO approach with reuse (which keeps the bind count down, and works cross-platform).

If you have a number of separate, preloaded VBOs, you absolutely can't/refuse to make them large enough to keep you from being CPU bound for some reason, and you can't/won't use bindless, then fall back on (in the order of the performance I've observed on NVidia) 1) VBOs with VAOs, one per batch state combination, 2) client arrays, or 3) VBOs without VAOs or with one VAO for all.

In case it's not obvious, I do what gives me the best performance. I'm not a core purist.

Its really unfortunate AMD hasn't stepped up and supported bindless in their OpenGL drivers, at least for launching batches (vertex attribute and index list specification).

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I unfortunately don't have that luxury. The world is fully 3D and i employ a large number of optimizations..

If there was any way at all to get even 20 ns i would rewrite everything in a heartbeat. The only caveat is that it has to work on any opengl 3.x implementation.

 

Also 300 VBOs was just a number. It's more like 300 to 5000, depending on config.ini settings.

Ideally I could draw 5000 per frame at 60 fps. But that wouldn't be right, now would it. smile.png

It's usually around 2000, going down to 1000 after occlusion culling. (A frame behind)

 

The terrain is dynamic and is produced on the fly. When the player moves, so the world "revolves." Trying to combine VBOs is definitely possible. I just wonder if it won't severely affect the GPU in the end. Combining all terrain data of the same (sectoral) x,z (internally known as columns) is something I'm already doing. The world just isn't a plane.

Edited by Kaptein

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