Elysian Shadows

Ginto8 wrote:I don't believe there is one; texture coordinates are provided in a [0,1] range. However, if you really want the original width and height, you can store it before you call glTexImage2D (you need the width and height to call it anyway), and then use it later.

Ginto8 wrote:well... it would probably actually be faster to store that data locally, rather than having to call an OpenGL function, which would then ask the GPU for the data, and then wait for the GPU to send it back. If you want, here's a semi-general template for a Texture class:

Code: Select all

class Texture {
    unsigned id;
    int w,h;

public:

    Texture([texture data]);
    ~Texture();

    void Bind() const;
    unsigned ID() const { return this->id; }
    int W() const { return this->w; }
    int H() const { return this->h; }
};

qpHalcy0n wrote:You can indeed query the texture's dimensions straight from OpenGL.

Bind the texture.
Call glGetTexLevelParameteriv(target, level, paramName, data);

Where target is likely to be GL_TEXTURE_2D, unless it's a cubemap, 3D texture, or 1D texture.
where level is an integer for the texture level you wish to retrieve. This is 0 for the topmost level (original size). If the texture is mipmapped, then the additional levels represent mip levels.
where paramName is GL_TEXTURE_WIDTH or GL_TEXTURE_HEIGHT
where data is a pointer to an int or an int array. In your case, this will be a pointer to an int since GL_TEXTURE_WIDTH and GL_TEXTURE_HEIGHT are integer fields.

texture->getWidth()

qpHalcy0n wrote:I'm being objective in answering the question that was asked :] (I'll bet you two will do just horribly on college tests )

If the question were asking for opinions about how to structure a proper image processing lib...well I can yapp your head off about that one :P