Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Robert Osfield]

Hi Remo,

On 14 March 2017 at 18:16, Remo Eichenberger  wrote:
> The env variable doesn't help. I see such errors:
>
> With subloading enabled i see this:
>
> before Glyph::subload(): detected OpenGL error: invalid enumerant
> Glyph::subload(): texture sub-image width and/or height of 0, ignoring 
> operation.

I can't investigate these OSX specific issues.  There is a limit to
the amount of free support I can do on this, the rewrite of osgText
has already cost me three weeks work, all unpaid.  It's time that OSX
users stood up to the plate and started resolving OSX specific issues.
There are other pressing things I need to get on with.

Robert.
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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

The env variable doesn't help. I see such errors:

With subloading enabled i see this:

before Glyph::subload(): detected OpenGL error: invalid enumerant
Glyph::subload(): texture sub-image width and/or height of 0, ignoring 
operation.

I've posted the log on the github issue.

Remo

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Robert Osfield]

On 14 March 2017 at 17:38, Remo Eichenberger  wrote:
> Without this setting I see only a blue screen/window without any text.

Do you get any GL errors reported on the console?

Could you try disabling the incremental subloading of the glyph
texture by setting the env var OSG_TEXT_INCREMENTAL_SUBLOADING to OFF

i.e.

setenv OSG_TEXT_INCREMENTAL_SUBLOADING OFF
osgtext

Also have you tried OSG+GL3 on other platforms?  Knowing whether this
is a OSX specific bug or not will help us look for what the cause
might be.

Robert.
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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Without this setting I see only a blue screen/window without any text.

Remo

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Robert Osfield]

On 14 March 2017 at 17:01, Remo Eichenberger  wrote:
> Update: Stock sample "examples_osgtext" partial works with:
>
> font->setMinFilterHint(osg::Texture::LINEAR);
>
> on MacOSX GL3 Core Profile

This will be disabling mipmapping.  Surely OSX GL3 core profile
supports mipmapping. this is a fundamental feature of texturing.
Perhaps the driver is broken.

Disabling mipmapping on text is not desirable as you'll end up with
aliasing artefacts when the text on screen size results in the texel
to pixel ratio less than one.

What happens you don't use the
font->setMinFilterHint(osg::Texture::LINEAR); hack?  A screenshot
would be useful.

Robert.
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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Update: Stock sample "examples_osgtext" partial works with:

font->setMinFilterHint(osg::Texture::LINEAR);

on MacOSX GL3 Core Profile

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Hi Robert

I've tested the latest branch on MacOSX 10.11.6:
https://github.com/openscenegraph/OpenSceneGraph/commit/f1f6d23eebda16a9d4560a0a130580d65edf7401

Non of the stock samples works because of not applied shader. MacOSX needs a 
default shader.

But simple text works when i add a shader on my sample code. 

Then i've added the Statshandler. It doesn't show the statistics.

Cheers,
Remo

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Robert Osfield]

Hi Remo,

As a first step to resolving the osgText issues with VAO I have
created a text_refactor branch off OSG master.

All I have done so far is add the ability of osgText::TextBase to have
NodeList _children that it traverses automatically, this _children
list is intended for the Text and Text3D classes to populate with
standard scene graph elements such as osg::Geometry/osg::StateSet to
render the text in conventional ways rather the the custom render code
that these classes currently have.

The next step will be to adapt osgText::Text to create the appropriate
subgraph to render the text and add this into the _children list.
osgText::Text is not a straight forward class so I expect we'll need
to slow fill in all the functionality bit by bit.  I welcome efforts
from the community in this effort.

Cheers,
Robert.
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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Robert Osfield]

HI Remo,

On 27 January 2017 at 14:29, Remo Eichenberger  wrote:
> OSG_VERTEX_BUFFER_HINT=VAO
> OSG_GEOMETRY_IMPLEMENTATION=VAO

Oh well, that exhausts one possibility of a fix.

I don't really know if it's worth trying to fix osgText::Text, when I
made the changes to support VAO I got things working under Linux, or
at least it appeared to be working, but osgText::Text implementation
is a real mess internally due to several early design decisions based
on limitations of hardware 15 years back then a series of contribution
that added extra features to Text but also with lots of complexities.

To properly fix it I feel that it might even be worth making
osgText::Text and full node and have it generate a subgraph (made with
standard osg::Geometry etc.) to do the actual rendering rather than
embed it all in a custom Drawable as is done now.  The problem would
be backwards compatibility.

I have too much other work on right now to dive into topic, but have a
think about  the issues when I do have time.

Robert.
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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

yes,

OSG_VERTEX_BUFFER_HINT=VAO
OSG_GEOMETRY_IMPLEMENTATION=VAO

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Robert Osfield]

On 27 January 2017 at 14:15, Remo Eichenberger  wrote:
> I use OSG master 255a86cbe22ba436ab162bd2a2e7cc0341140050

Have you enabled the new VAO support?

The env var OSG_VERTEX_BUFFER_HINT should be used and set to VAO.

Robert.
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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Hi Robert

I use OSG master 255a86cbe22ba436ab162bd2a2e7cc0341140050

Cheers,
Remo

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Robert Osfield]

Hi Remo,

On 27 January 2017 at 13:59, Remo Eichenberger  wrote:
> I've tried a lot of things to get osgText working on MacOSX with VAO. GL3 on 
> OSX Core Profile requires VAOs.

I don't have an OSX system so can't comment on the specifics of VAO
support on MacOSX, I have rely upon OSX users to provide testing and
guidance on it.

The only thing I can add is to ask which version of the OSG you are
using, and whether you've tested the new VAO support in OSG master.

Robert.
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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Hi (Robert :)

I've tried a lot of things to get osgText working on MacOSX with VAO. GL3 on 
OSX Core Profile requires VAOs.

osgText doesn't setup the VAO path correctly on MacOSX. I can show glyphs when 
I use a osg::Geometry as a Wrapper to draw geometries from text glyphs like so:


Code:

class ExtText : public Text {
friend class VAOText;
};

class VAOText : public osg::Geometry
{
private:
osg::ref_ptr _t;

...
void redraw()
{
unsigned int contextID = 0; // renderInfo.getState()->getContextID();

if ( !_t->_textureGlyphQuadMap.empty() )
{
const ExtText::GlyphQuads& glyphquad = 
(_t->_textureGlyphQuadMap.begin())->second;
if (!glyphquad._transformedCoords[contextID].valid() || 
glyphquad._transformedCoords[contextID]->empty() )
{
_t->computePositions(contextID);
}
}

for(ExtText::TextureGlyphQuadMap::iterator 
titr=_t->_textureGlyphQuadMap.begin();
titr!=_t->_textureGlyphQuadMap.end();
++titr)
{
const ExtText::GlyphQuads& glyphquad = titr->second;
const ExtText::GlyphQuads::Coords3& transformedCoords = 
glyphquad._transformedCoords[contextID];
if (transformedCoords.valid() && !transformedCoords->empty())
{

setVertexArray(transformedCoords.get());
setTexCoordArray(0, glyphquad._texcoords.get());

getOrCreateStateSet()->setTextureAttributeAndModes(0, 
titr->first.get(),osg::StateAttribute::ON);
addPrimitiveSet(glyphquad._quadIndices);
}
}
}




But it doesn't work with plain osgText. So something is wrong in osgText / VAO.

Cheers,
Remo

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Sebastian Messerschmidt]

Hi Remo

Hi Sebastian

I'm wondering if you have a running osgText on MacOSX Core Profile. Your 
shader-code is not compatible with it. I've written a partial working version 
of this shader. I also found that the Glyph Texture is created with red. But i 
think something is wrong with the texturecoordinates. I don't see any glyph.
I'm not using MacOSX, but I'm running on core profile under Windows and 
the shader seems to work for osgText there.



Code:
uniform sampler2D glyphTexture;
in vec2 texCoord;
out vec4 color;
void main()
{
  color = vertexColor * texture(glyphTexture, texCoord).r;
}


Basically the font should be white and modulated by the vertex color. I 
would have to dive into the implementation to see, why your information 
is in the red-channel. It might very well be, that the osgText is using 
GL_RED or something else which I can access via the .a swizzle in my 
driver.







I'm not sure the code of "Text::drawForegroundText" can work with VAO (It's 
required on MacOSX)
I'm not sure if the VAO path is used on my side. So I can't help you 
with this one.


Cheers
Sebastian


Here you find a draw dump from MacOSX:

[Image: http://forum.openscenegraph.org/files/dump_202.png ]

Cheers,
Remo[/img]

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Hi Sebastian,

Sorry, please ignore my post. The code is wrong. I need to test it first :)


Cheers,
Remo

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Hi Sebastian

Thank you for your help. Yes i don't see the glyphs. I use osgEarth, but this 
should not be a problem :)

I've tried the following according your sample:


Code:

ControlCanvas* canvas = ControlCanvas::getOrCreate( view );

view->getCamera()->getGraphicsContext()->getState()->setUseModelViewAndProjectionUniforms(true);

view->getCamera()->getGraphicsContext()->getState()->setUseVertexAttributeAliasing(true);

osg::ref_ptr texture = new osg::Texture2D;
osg::ref_ptr image = new osg::Image();
image->allocateImage(512, 512, 1, GL_RGBA, GL_UNSIGNED_BYTE);

texture->setImage(image);

view->getCamera()->getOrCreateStateSet()->setTextureAttributeAndModes(0, 
texture, osg::StateAttribute::ON);

LabelControl* label = new LabelControl();
osg::Program* textProgramObject = new osg::Program;
osg::Shader* textVertexObject =
new osg::Shader( osg::Shader::VERTEX );
osg::Shader* textFragmentObject =
new osg::Shader( osg::Shader::FRAGMENT );
textProgramObject->addShader( textFragmentObject );
textProgramObject->addShader( textVertexObject );
textFragmentObject->setShaderSource(frag);
textVertexObject->setShaderSource(vert);
label->getOrCreateStateSet()->setAttributeAndModes(textProgramObject, 
osg::StateAttribute::ON);

label->setTextBackdropType(osgText::Text::BackdropType::NONE);

label->setTextBackdropImplementation(osgText::Text::BackdropImplementation::DELAYED_DEPTH_WRITES);

label->setBackColor( Color( Color::Black, 0.8 ) );
label->setHorizAlign( Control::ALIGN_RIGHT );
label->setVertAlign( Control::ALIGN_BOTTOM );
label->setVisible( true );





But i don't see any glyphs.

Cheers,
Remo[/code]

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Re: [osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Sebastian Messerschmidt]

Hi Remo,

A more detailed description on how it fails would be helpful.
If you're seeing non-textures quads instead of your glyphs you need to 
adapt your shader as the text-rendering isn't using a normal blending.
I've attached my default core-profile shader which uses pre-multiplied 
alpha.
Additionally I add a default sampler at camera root for the osg_Texture 
and I do:


for (auto index = 0u; index < mMainViewer->getNumViews(); ++index )
{
getCamera(index)->getGraphicsContext()->getState()->setUseModelViewAndProjectionUniforms(true);
getCamera(index)->getGraphicsContext()->getState()->setUseVertexAttributeAliasing(true);
}

nsRenderer::Helpers::addTexture( 
stats_handler->getCamera()->getOrCreateStateSet(), "osg_Texture",new 
osg::Texture2D(nsRenderer::Helpers::getDefaultImage(false)), 0);


Hope that helps
Sebastian

Hi,

I can't render osgText on MacOSX Core Profile:

text->setTextBackdropType(osgText::Text::BackdropType::NONE);
text->setTextBackdropImplementation(osgText::Text::BackdropImplementation::DELAYED_DEPTH_WRITES);
 
text->setBackColor( Color( Color::Black, 0.8 ) );

text->setHorizAlign( Control::ALIGN_RIGHT );
text->setVertAlign( Control::ALIGN_BOTTOM );
text->setVisible( true );

I've also tried to apply a default shader. But it doesn't work at all.
  
Cheers,

Remo

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#version 440
#extension GL_ARB_enhanced_layouts : enable
#extension GL_ARB_separate_shader_objects : enable

layout (location=0) out vec4 FragmentData;

layout(location=1) in block
{
mediump vec2 tex_coord;
mediump vec4 color;
} In;

uniform sampler2D osg_Texture;

void main()
{
vec4 diffuse_color = In.color;
diffuse_color *=  texture2D(osg_Texture, In.tex_coord).a;

FragmentData = diffuse_color;
}#version 440
#extension GL_ARB_enhanced_layouts : enable
#extension GL_ARB_separate_shader_objects : enable

layout (location=0) in vec4 osg_Vertex;
layout (location=1) in vec3 osg_Normal;
layout (location=2) in vec4 osg_Color;
layout (location=3) in vec4 osg_MultiTexCoord0;
#ifdef HUD_CLIP_PLANES
layout(shared) uniform instanceData
{
vec4 clipPlane[6];
};
#endif

uniform mat4 osg_ModelViewMatrix;
uniform mat4 osg_ModelViewProjectionMatrix;
uniform mat4 TextureMatrix;

out gl_PerVertex
{
vec4 gl_Position;
};

layout(location=1) out block
{
mediump vec2 tex_coord;
mediump vec4 color;
} Out;

void main()
{
Out.color = osg_Color;
Out.tex_coord = vec4(osg_MultiTexCoord0).xy;
gl_Position = osg_ModelViewProjectionMatrix * osg_Vertex;

}
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[osg-users] bug: osgText doesn't work on MacOSX GL4.x with VAO

[Remo Eichenberger]

Hi,

I can't render osgText on MacOSX Core Profile:

text->setTextBackdropType(osgText::Text::BackdropType::NONE);
text->setTextBackdropImplementation(osgText::Text::BackdropImplementation::DELAYED_DEPTH_WRITES);

text->setBackColor( Color( Color::Black, 0.8 ) );
text->setHorizAlign( Control::ALIGN_RIGHT );
text->setVertAlign( Control::ALIGN_BOTTOM );
text->setVisible( true );

I've also tried to apply a default shader. But it doesn't work at all.
 
Cheers,
Remo

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