Re: [osg-users] Post Processing Effect - Vertex Shader not working
Hi Guy,
Have you enabled the tracking of model,view and projection matrices as well
as the vertex attribute aliasing?
I use this in my own code:
// switch on the uniforms that track the modelview and projection matrices
mViewer->getCamera()->getGraphicsContext()->getState()->setUseModelViewAndProjectionUniforms(true);
//proper initialization of vertex attribute
mViewer->getCamera()->getGraphicsContext()->getState()->setUseVertexAttributeAliasing(true);
As vertex shader I use (untested after removing irrelevant parts, but
should work):
#version 330 core
layout(location = 0) in vec4 position;
layout(location = 1) in vec3 normal;
layout(location = 2) in vec4 color;
layout(location = 3) in vec4 texCoords;
out vec2 TexCoords;
uniform mat4 osg_ModelViewProjectionMatrix;
void main()
{
gl_Position = osg_ModelViewProjectionMatrix * position;
TexCoords = texCoords.st;
}
you can then pick up the texture coordinates again in the fragment shader
using:
in vec2 TexCoords;
Goodluck!
Antiro
On Sat, Sep 16, 2017 at 12:35 AM, Volckaert, Guy (CA - MTS) <
guy.volcka...@meggitt.com> wrote:
> Hi,
>
>
>
> Sorry to bother you guys... but I was wondering if you can help identify
> why my pass through vertex shader isn't working. In essence, if I enable
> the vertex shader, then the scene disappears (I only see that blue
> background color). If I disable it then the scene appears correctly. No
> errors are generated by OSG after linking the vertex shader. I know that my
> fragment shader is working because if I set the gl_FragColor to red then
> the scene is completely red.
>
>
>
> Here are my pass-thru shaders:
>
>
>
> [code]
>
> VERTEX SHADER
>
> =
>
> attribute vec4 osg_Vertex;
>
> void main( void )
>
> {
>
> gl_Position = osg_Vertex;
>
> }
>
>
>
> FRAGMENT SHADER
>
> ===
>
> uniform sampler2D tRttTexture;
>
>
>
> void main( void )
>
> {
>
> vec3 vColor = texture2D( tRttTexture, gl_TexCoord[0].st ).rgb;
>
> // Output color.
>
> gl_FragColor = vec4( vColor, 1.0 );
>
> }
>
> [/code]
>
>
>
>
>
> The shader is applied on a fullscreen quad using typical Ortho2D
> projection. Here is the code that loads the shader which is applied to the
> post process geode containing a single geometry quad:
>
>
>
> [code]
>
> void loadShaders( )
>
> {
>
> osg::StateSet* pStateSet = g_pPolyGeode->getOrCreateStateSet( );
>
>
>
> osg::ref_ptr pProgram = new osg::Program;
>
> pProgram->setName( "PostProcessProgram" );
>
>
>
> osg::ref_ptr pVertShader = osg::Shader::readShaderFile(
> osg::Shader::VERTEX, osgDB::findDataFile( "shaders/osgprerender.vert" ) );
>
> if( pVertShader )
>
> {
>
> pVertShader->setName( "osgprerender.vert" );
>
> pProgram->addShader( pVertShader );
>
> pProgram->addBindAttribLocation( "osg_Vertex", 0 );
>
> }
>
>
>
> osg::ref_ptr pFragShader = osg::Shader::readShaderFile(
> osg::Shader::FRAGMENT, osgDB::findDataFile( "shaders/osgprerender.frag" ) );
>
> if( pFragShader )
>
> {
>
> pFragShader->setName( "osgprerender.frag" );
>
> pProgram->addShader( pFragShader );
>
> }
>
>
>
> // RTT texture.
>
> pStateSet->addUniform( new osg::Uniform( "tRttTexture", 0 ) );
>
> pStateSet->setAttributeAndModes( pProgram, osg::StateAttribute::ON );
>
> }
>
> [/code]
>
>
>
>
>
> What am I doing wrong? I tried different variation of the shader but
> nothing works. Here are the variations that I tried:
>
>
>
> [code]
>
> VARIATION #1
>
> ===
>
> void main( void )
>
> {
>
> gl_Position = gl_Vertex;
>
> }
>
>
>
> VARIATION #2
>
> ===
>
> void main( void )
>
> {
>
> gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
>
> }
>
>
>
> VARIATION #3
>
> ===
>
> attribute vec4 osg_Vertex;
>
> void main( void )
>
> {
>
> gl_Position = gl_ModelViewProjectionMatrix * osg_Vertex;
>
> }
>
>
>
> VARIATION #4
>
> ===
>
> void main( void )
>
> {
>
> gl_Position = ftransform();
>
> }
>
> [/code]
>
>
>
> Any help would be really appreciated... The full source code is attached.
>
>
>
> Thank you!
>
>
>
> Cheers,
>
> Guy
>
>
>
> *Guy Volckaert**, ing.*
> Snr Software Engineer
>
> *Meggitt Training Systems (Quebec) Inc.*
> *Systèmes d’entraînement Meggitt (Québec) Inc.*
> 6140 Henri Bourassa West
> Montreal, Quebec, H4R 3A6
> Canada
>
> Tel: 1 (514) 339 9938 Ext 617 <(514)%20339-9938>
> Fax: 1 (514) 339 2641 <(514)%20339-2641>
> Cell: 1 (514) 928-5641 <(514)%20928-5641>
> email: guy.volcka...@meggitt.com
> url; www.meggitt.com
> skype: guy.volckaert
>
> *Svp. Considérez l’environnement avant d’imprimer*
> *Please consider the environment before printing this e-mail.*
>
>
>
> --
>
>
> This e-mail may contain proprietary information and/or copyright material.
> This e-mail is intended for the use of the addressee only. Any unauthorized
> use may be unlawful. If you receive this e-mail by mistake, please advise
> the sender immediately
[osg-users] Post Processing Effect - Vertex Shader not working
Hi,
Sorry to bother you guys... but I was wondering if you can help identify why my
pass through vertex shader isn't working. In essence, if I enable the vertex
shader, then the scene disappears (I only see that blue background color). If I
disable it then the scene appears correctly. No errors are generated by OSG
after linking the vertex shader. I know that my fragment shader is working
because if I set the gl_FragColor to red then the scene is completely red.
Here are my pass-thru shaders:
[code]
VERTEX SHADER
=
attribute vec4 osg_Vertex;
void main( void )
{
gl_Position = osg_Vertex;
}
FRAGMENT SHADER
===
uniform sampler2D tRttTexture;
void main( void )
{
vec3 vColor = texture2D( tRttTexture, gl_TexCoord[0].st ).rgb;
// Output color.
gl_FragColor = vec4( vColor, 1.0 );
}
[/code]
The shader is applied on a fullscreen quad using typical Ortho2D projection.
Here is the code that loads the shader which is applied to the post process
geode containing a single geometry quad:
[code]
void loadShaders( )
{
osg::StateSet* pStateSet = g_pPolyGeode->getOrCreateStateSet( );
osg::ref_ptr pProgram = new osg::Program;
pProgram->setName( "PostProcessProgram" );
osg::ref_ptr pVertShader = osg::Shader::readShaderFile(
osg::Shader::VERTEX, osgDB::findDataFile( "shaders/osgprerender.vert" ) );
if( pVertShader )
{
pVertShader->setName( "osgprerender.vert" );
pProgram->addShader( pVertShader );
pProgram->addBindAttribLocation( "osg_Vertex", 0 );
}
osg::ref_ptr pFragShader = osg::Shader::readShaderFile(
osg::Shader::FRAGMENT, osgDB::findDataFile( "shaders/osgprerender.frag" ) );
if( pFragShader )
{
pFragShader->setName( "osgprerender.frag" );
pProgram->addShader( pFragShader );
}
// RTT texture.
pStateSet->addUniform( new osg::Uniform( "tRttTexture", 0 ) );
pStateSet->setAttributeAndModes( pProgram, osg::StateAttribute::ON );
}
[/code]
What am I doing wrong? I tried different variation of the shader but nothing
works. Here are the variations that I tried:
[code]
VARIATION #1
===
void main( void )
{
gl_Position = gl_Vertex;
}
VARIATION #2
===
void main( void )
{
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
VARIATION #3
===
attribute vec4 osg_Vertex;
void main( void )
{
gl_Position = gl_ModelViewProjectionMatrix * osg_Vertex;
}
VARIATION #4
===
void main( void )
{
gl_Position = ftransform();
}
[/code]
Any help would be really appreciated... The full source code is attached.
Thank you!
Cheers,
Guy
Guy Volckaert, ing.
Snr Software Engineer
Meggitt Training Systems (Quebec) Inc.
Systèmes d'entraînement Meggitt (Québec) Inc.
6140 Henri Bourassa West
Montreal, Quebec, H4R 3A6
Canada
Tel: 1 (514) 339 9938 Ext 617
Fax: 1 (514) 339 2641
Cell: 1 (514) 928-5641
email: guy.volcka...@meggitt.com
url; www.meggitt.com
skype: guy.volckaert
Svp. Considérez l'environnement avant d'imprimer
Please consider the environment before printing this e-mail.
This e-mail may contain proprietary information and/or copyright material. This
e-mail is intended for the use of the addressee only. Any unauthorized use may
be unlawful. If you receive this e-mail by mistake, please advise the sender
immediately by using the reply facility in your e-mail software.
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