QImage get data... transfer from basic C++

glararan

Hello, i need help.
I'm switching from basic C++ opengl to Qt framework opengl. What i am doing? Rendering terrain from heightmap png.

This is basic c++ source code: http://pastebin.com/Hhg2ph5w
vec3f is just xyz... bitmap = ImageLoader.h = http://www.gamedev.net/page/resources/_/technical/game-programming/how-to-load-a-bitmap-r1966

In basic c++ i render from bitmap = .bmp, but for better heightmaps details i using grayscale png 16 bit and its little difficult in basic c++ so i switch on qt. And here im trying to render terrain but when i open program i just see background :(

Qt sources:
Terrain.h http://pastebin.com/r1xhHneN
Terrain.cpp http://pastebin.com/6eQhPu7i
widget.h http://pastebin.com/xxR9mXf3
widget.cpp http://pastebin.com/m945uhMG

All is same until: loadTerrain

basic:
@Terrain* loadTerrain(const char* fileName, float height)
{
Bitmap* image = new Bitmap();
image->loadBMP(fileName);

Terrain* t = new Terrain(image->width, image->height);

for(int y = 0; y < image->height; y++)
{
for(int x = 0; x < image->width; x++)
{
unsigned char color = (unsigned char)image->data[3 * (y * image->width + x)];
float h = height * ((color / 255.0f) - 0.5f);

t->setHeight(x, y, h);
}
}

delete image;
t->computeNormals();

return t;
}@

qt:
@Terrain* loadTerrain(QString fileName, float height)
{
QImage* image = new QImage(fileName);

Terrain* t = new Terrain(image->width(), image->height());

char* data;
data = new char[image->width() * image->height() * 3];

for(int y = 0; y < image->height(); y++)
{
    for(int x = 0; x < image->width(); x++)
    {
        unsigned char color = data[3 * (y * image->width() + x)];
        float h = height * ((color / 255.0f) - 0.5f);

        t->setHeight(x, y, h);
    }
}

delete image;
t->computeNormals();

return t;

}@

It must be problem here. I think its problem about char* data ...
And what is format type for grayscale 16 bit?

matti-

To access the bitmap data within QImage, take a look at QImage::bits(). In your code youre just allocating a new buffer and accessing it.

To load image data, do something such as:

@QImage image(imageName);
if ( !image.isNull() )
{
const char* data = (const char*)image.bits();
// TODO your stuff here :)
}
@