View Full Version : bitmap as a raster pic

06-13-2004, 12:15 AM
How can I display a 24 bit rgba bitmap (using alpha channel) on the screen using raster coordinates?
I already got a code like that:

GLubyte A[1][13] = { {0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xff, 0xc3, 0xc3, 0xc3, 0x66, 0x3c, 0x18}};

glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

glRasterPos2i(x_pos, y_pos);
glColor3f(1, 1, 1);
glBitmap(8, 13, 0.0, 0.0, 0.0, 0.0, A[0]);

but I'm not sure how to use a 24 bit bitmap instead of a b/w bitmap...
Can anyone help me?

06-13-2004, 08:59 AM
A bitmap is a rectangular array of 0's and 1's. OpenGL doesn't support pixmaps. Either look at texturing or copying image data directly into the frame buffer.

06-13-2004, 01:13 PM
Didn't mention this, but, for copying pixels to frame buffer use glRasterPos*() to set location for glDrawPixels().