[Problem] Loading image with OpenGL orthogonal view pixel-to-pixel

Nibbie

Posts: 2
Joined: 2009.08

Post: #1

Aug 19, 2009 — 12:49 PM

Hi!
I'm trying to load an image onto my opengl scene.
i've created a shape, and used texture to load the image on to that shape.

Here is my setupView function (which is called by initWithCode

Code:

- (void)setupView {

    const GLfloat zNear = 0.01, zFar = 10000.0;

    GLfloat size;

    glEnable(GL_DEPTH_TEST);

    glMatrixMode(GL_PROJECTION);

    size=1.0;

    // This give us the size of the iPhone display

    CGRect rect = self.bounds;

    glOrthof(-size, size, -size / (rect.size.width / rect.size.height), size / (rect.size.width / rect.size.height), zNear, zFar);

    glViewport(0, 0, rect.size.width, rect.size.height);

    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

}

The problem is, when i load my texture, i have to guess the size of the shape (for my 256x256, so it will be a power-of-2 size) image, i use the size: 1.58.

Anyone knows how could i do this pixel-to-pixel, meaning: 2.56 (256 pixels) would be the size i would have to enter?

thanks.

arekkusu

Sage

Posts: 1,231
Joined: 2002.10

Post: #2

Aug 19, 2009 — 07:21 PM

glOrthof(0, rect.size.width, 0, rect.size.height, zNear, zFar);

Lexis

Nibbie

Posts: 2
Joined: 2009.08

Post: #3

Aug 21, 2009 — 01:35 AM

Thanks it works.

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