整数integer 纹理送入到glsl中

wwwanghao

之前发了个贴，说是render to texture的时候，读不出来float数，现在的想把整数纹理送进glsl的fragment shading代码段，却送不进去
读送入的纹理数据代码如下：
ivec3 color=texture2D(texture1,0);
读到的结果竟然是 0.
纹理送入部分的代码如下，只用了一个纹理进行测试
unsigned int imgdata[1];
imgdata[0]=2;
img->setImage(1,1,1,GL_INTENSITY32UI_EXT,GL_INTENSITY,GL_UNSIGNED_INT,(unsigned char*)imgdata,osg::Image::USE_NEW_DELETE);
osg::Texture2D *tex2d=new osg::Texture2D;
tex2d->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::NEAREST);
tex2d->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::NEAREST);
tex2d->setWrap(osg::Texture2D::WRAP_R,osg::Texture2D::REPEAT);
tex2d->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::REPEAT);
tex2d->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::REPEAT);
tex2d->setImage(img);
试了下面的表达式，进行替换也不行，结果仍为0
img->setImage(1,1,1,GL_LUMINANCE,GL_LUMINANCE,GL_UNSIGNED_INT,(unsigned char*)imgdata,osg::Image::USE_NEW_DELETE);
img->setImage(1,1,1,GL_RED,GL_RED,GL_UNSIGNED_INT,(unsigned char*)imgdata,osg::Image::USE_NEW_DELETE);
但是发现，浮点数据却可以送进去呀，浮点纹理的代码如下。
osg::Image* img = new osg::Image();
float imgdata[1];
imgdata[0]=2;
img->setImage(1,1,1,GL_LUMINANCE32F_ARB,GL_LUMINANCE,GL_FLOAT,(unsigned char*)imgdata,osg::Image::USE_NEW_DELETE);
这是为什么呀，我这一周都被这送进送出的问题烦死了，谢谢大神指点。

array

setInternalTextureFormat要给定一个与之对应的值

wwwanghao

谢谢array
实际上，下面这句话已经涵盖了setInternalTextureFormat所要表达的意思，即第四个参数。
img->setImage(1,1,1,GL_INTENSITY32UI_EXT,GL_INTENSITY,GL_UNSIGNED_INT,(unsigned char*)imgdata,osg::Image::USE_NEW_DELETE);