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C-/C++-Quelltext

HRESULT LoadTextureFromBMP(char *pFilename,int ResX,int ResY,GLuint *pTex)
{
    HBITMAP Bmp;
    HDC     BmpDC;

    Bmp=(HBITMAP)LoadImage(GetModuleHandle(NULL), pFilename, 0,ResX, ResY, LR_LOADFROMFILE);
    if (!Bmp) return E_FAIL;

    BmpDC=CreateCompatibleDC(GetDC(HWND_DESKTOP));
    if (!BmpDC)
    {
        DeleteObject(Bmp);
        return E_FAIL;
    }

    SelectObject(BmpDC, Bmp);

    struct color
    {
        float r,g,b;
        color() {}
        color(float _r,float _g,float _b):r(_r),g(_g),b(_b) {}
        ~color() {}
    };

    color *pData=new color[ResX*ResY];

    for (int x=0; x<ResX; x++)
    for (int y=0; y<ResY; y++)
    {
        COLORREF ref=GetPixel(BmpDC,x,y);
        pData[y * ResY + x]=color((float)(GetRValue(ref))/255.0f,
                                  (float)(GetGValue(ref))/255.0f,
                                  (float)(GetBValue(ref))/255.0f);
    }

    DeleteObject(Bmp);
    DeleteDC(BmpDC);
    
    glGenTextures(1,pTex);

    glBindTexture(GL_TEXTURE_2D, *pTex);

    glTexImage2D(GL_TEXTURE_2D, 0, 3, ResX, ResY, 
                    0, GL_RGB, GL_FLOAT, pData);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

    delete[] pData;

    return S_OK;
}