Hi Hesicong,
You could try seting Image::internalTextureFormat to GL_RGBA32F_ARB. When you
attach image to RTT camera its FBO Renderbuffer format is selected based on
this parameter. If your image had not set internalTextureFormat Render buffer
should be standard 32bit RGBA.
There was also a fix two days ago which preserved internalTextureFormat from
being reset in Image::readPixels called at the end of RTT render to read FBO
contents. So just to be safe I suggest you use OSG in latest SVN version.
Cheers,
Wojtek
----- Original Message -----
From: hesicong2006
To: OpenSceneGraph Users
Sent: Thursday, July 03, 2008 10:05 AM
Subject: Re: [osg-users] Render To Texture attached Image do not support
RGBA32 format, value clamped to 1!
I found out the tricky code!
YOU MUST ATTACH the texture and your image~, see the code segment of
osgmultiplerendertargets.cpp from line 343 to 360:
for (int i=0; i<NUM_TEXTURES; i++) {
camera->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0+i),
textureRect[i]);
}
// we can also read back any of the targets as an image, modify this
image and push it back
if (useImage) {
// which texture to get the image from
const int tex_to_get = 0;
osg::Image* image = new osg::Image;
if (useHDR) {
image->allocateImage(tex_width, tex_height, 1, GL_RGBA,
GL_FLOAT);
} else {
image->allocateImage(tex_width, tex_height, 1, GL_RGBA,
GL_UNSIGNED_BYTE);
}
// attach the image so its copied on each frame.
camera->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0 +
tex_to_get), image);
That's OK!
hesicong2006 wrote:
Hi, Delport:
I tried your method, that's OK, I see the output. I'll check what's
wrong with my code or if there's some tricky code I ignore. Thanks!
J.P. Delport wrote:
Hi,
I have just edited osgmultiplerendertargets example and can confirm you
can get values > 1.
In the example, search for e-12 and change to e12 in the shader.
Run with:
osgmultiplerendertargets --hdr --image.
You will see that it prints values > 1.
jp
hesicong2006 wrote:
Hi, Robert:
I'm now writing shader to compute world coordinate of the scene and
save them as image. The value output by shader will exceed 1 and require float
values, so I use GL_RGBA32F_ARB for RTT texture. Since I must save them to an
image, I must allocate a Image and attach it to the texture. My texture setup
code is :
osg::ref_ptr<osg::Texture2D> texture=new osg::Texture2D();
osg::ref_ptr<osg::Image> image=new osg::Image;
image->allocateImage(1024,768 , 1, GL_RGBA, GL_FLOAT);
texture->setTextureSize(1024,768);
texture->setInternalFormat(GL_RGBA32F_ARB);
texture->setSourceFormat(GL_RGBA);
texture->setSourceType(GL_FLOAT);
texture->setResizeNonPowerOfTwoHint(false);
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture->setImage(0, image.get());
And then I attach the image to camera:
camera=viewer->getCamera();
camera->setGraphicsContext(gc.get());
camera->setViewport(0,0,wWidth,wHeight);
camera->attach(osg::Camera::COLOR_BUFFER, texture->getImage());
camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
But after I ran the program and saved the image, I found out the shader
output value which exceed 1 is clamped to 1! In order to check the problem, I
wrote a small callback to check it:
class VoxlizationPreDrawCallback : public osg::Camera::DrawCallback
{
public:
virtual void operator () (osg::RenderInfo& ) const
{
for(int y=0;y<768;y++)
{
for(int x=0;x<1024;x++)
{
float value=*(float*)imageToSave->data(x,y);
if(value>1)
{
std::cout<<"x="<<x<<" y="<<y<<std::endl;
}
}
}
}
osg::Image* imageToSave;
};
But no value exceed 1. I changed the value>1 to value==1, it will give
me a lot of values.
I also tried if my shader can't output values above 1, I changed the
camera setting from
camera->attach(osg::Camera::COLOR_BUFFER, texture->getImage());
to
camera->attach(osg::Camera::COLOR_BUFFER, texture->get());
And I can see in GDebugger 4.2 frame buffer object, some values
actually above 1.
So I guess the process of camera writing values to osg::Image does not
support RGBA32 float format or it clamp the value to 1, float value should not
clamp to 1, it buggy!
Please check it! Thanks! And I also attached my little code and a box
model which size is (2*2*2) to help reproduce the problem.
Hesicong
2008-7-3
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