CODEWITHSUNDEEP
imageopenglimportsizetextures
Martin Rezyne
Martin Rezyne

Reputation: 445

OpenGL standard unit measure

I am tring to import an image in an OpenGl project as background for a scene.

loadTGA("Textures\\greenhill_positive_x.tga",skyboxTexture[1]); 
sizeX = 20.0; sizeY = 20.0; sizeZ = 3.0;
glBindTexture(GL_TEXTURE_2D, skyboxTexture[1]);
glBegin(GL_QUADS);
    glTexCoord2f(1, 1);glVertex3f(sizeX, -sizeY, -sizeZ);
    glTexCoord2f(0, 1);glVertex3f(-sizeX, -sizeY, -sizeZ);
    glTexCoord2f(0, 0);glVertex3f(-sizeX, -sizeY, sizeZ);
    glTexCoord2f(1, 0);glVertex3f(sizeX, -sizeY, sizeZ);
glEnd();

The code works well but the texture is resized to fit sizeX, sizeY, sizeZ values. The size of tga file is 250x250 px. What values should I pass to sizeX, sizeY, sizeZ to match the image size?

Upvotes: 0

Views: 45

Answers (1)

ratchet freak
ratchet freak

Reputation: 48226

if you load identity matrices for all modes then it's just:

glBegin(GL_QUADS);
    glTexCoord2f(1, 1);glVertex3f(1, 1, 0);
    glTexCoord2f(0, 1);glVertex3f(-1, 1, 0);
    glTexCoord2f(0, 0);glVertex3f(-1, -1, 0);
    glTexCoord2f(1, 0);glVertex3f(1, -1, 0);
glEnd();

you should disable depth writing and testing.

Upvotes: 2

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