<html> <head> </head> <body class='hmmessage'><div dir='ltr'> <style></style> <div dir="ltr">Hello I have trouble drawing text in an OpenGL texture with Cairo It works with SDL and SDL_ttf with :     GLuint textureId;               SDL_Color Color = {150, 0, 240};         SDL_Surface *Message = TTF_RenderText_Blended(font, "Hello!", Color);         unsigned Texture = 0;         glGenTextures(1, &Texture);         glBindTexture(GL_TEXTURE_2D, Texture);         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Message->w, Message->h, 0, GL_BGRA, GL_UNSIGNED_BYTE, Message->pixels);                 glBegin(GL_QUADS);         glColor4f(1, 0, 0, 1);         glTexCoord2d(0, 0); glVertex3d(0, 0, 0);         glTexCoord2d(1, 0); glVertex3d(0.2, 0, 0);         glTexCoord2d(1, 1); glVertex3d(0.2, -0.2, 0);         glTexCoord2d(0, 1); glVertex3d(0,  -0.2, 0);         glEnd();                 glDeleteTextures(1, &Texture);                 SDL_FreeSurface(Message); Clearly, the Message->pixels argument in "glTexImage2D" seems important; if I replace it with NULL, I get random lines and points. If I do this with Cairo :         cairo_surface_t *surface;         cairo_t *cr;         GLuint textureId;         unsigned char* surfaceData;         surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 64, 64);         cr = cairo_create (surface);         cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL,  CAIRO_FONT_WEIGHT_BOLD);         cairo_set_font_size (cr, 32.0);         cairo_set_source_rgb (cr, 1.0, 1.0, 0.0);         cairo_show_text (cr, "HELLO");                 surfaceData = cairo_image_surface_get_data (surface);                 unsigned Texture = 0;         glGenTextures(1, &Texture);         glBindTexture(GL_TEXTURE_2D, Texture);         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, cairo_image_surface_get_width (surface), cairo_image_surface_get_height (surface), 0, GL_BGRA, GL_UNSIGNED_BYTE, surfaceData);                        glBegin(GL_QUADS);         glColor4f(1, 0, 0, 1);        glTexCoord2d(0, 0); glVertex3d(0, 0, 0);         glTexCoord2d(1, 0); glVertex3d(0.2, 0, 0);         glTexCoord2d(1, 1); glVertex3d(0.2, -0.2, 0);         glTexCoord2d(0, 1); glVertex3d(0,  -0.2, 0);         glEnd();                 glDeleteTextures(1, &Texture);         cairo_destroy (cr);         cairo_surface_destroy (surface); If I do that I get a few red points but not the text I want. I use the " cairo_image_surface_get_data (surface)" function to get the appropriate data and to give it to glTextImage2D but I suppose this is where it won't work. In some examples I have come across the "create_cairo_context" through which surfaceData can be taken. But this function seems completely unknown on my system... I am using Ubuntu Linux 11.10 (lateste version) Please could give me some help about this? Victor </div> </div></body> </html>