.gif image display using OpenGl - opengl

Question

Can I display *.gif image in openGL?
I want to use it like texture of glQuad display list.
glNewList(base+loop,GL_COMPILE); // Start Building A List
glBegin(GL_QUADS); // Use A Quad For Each Character
glTexCoord2f(cx,1-cy-0.0625f); // Texture Coord (Bottom Left)
glVertex2i(0,0); // Vertex Coord (Bottom Left)
glTexCoord2f(cx+0.0625f,1-cy-0.0625f); // Texture Coord (Bottom Right)
glVertex2i(16,0); // Vertex Coord (Bottom Right)
glTexCoord2f(cx+0.0625f,1-cy); // Texture Coord (Top Right)
glVertex2i(16,16); // Vertex Coord (Top Right)
glTexCoord2f(cx,1-cy); // Texture Coord (Top Left)
glVertex2i(0,16); // Vertex Coord (Top Left)
glEnd(); // Done Building Our Quad (Character)
glTranslated(10,0,0); // Move To The Right Of The Character
glEndList();
Thx
I m using yhis libraries
#include <windows.h> // Header File For Windows
#include <stdio.h> // Header File For Standard Input/Output
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <sstream>
//#include "glut.h"
#include <gl\gl.h> // Header File For The OpenGL32 Library
#include <gl\glu.h> // Header File For The GLu32 Library
#include <gl\glut.h>
#include <gl\glaux.h>

Answer 1

I recommend you to use SFML - it supports lot of image formats and image loading/processing is made simple with it. Here's an example application with textured cube using SFML:
#include <SFML/Graphics.hpp>
#include <iostream>
int main()
{
// Create main window
sf::RenderWindow App(sf::VideoMode(800, 600), "SFML OpenGL");
App.PreserveOpenGLStates(true);
// Create a sprite for the background
sf::Image BackgroundImage;
if (!BackgroundImage.LoadFromFile("datas/opengl/background.jpg"))
return EXIT_FAILURE;
sf::Sprite Background(BackgroundImage);
// Load an OpenGL texture.
// We could directly use a sf::Image as an OpenGL texture (with its Bind() member function),
// but here we want more control on it (generate mipmaps, ...) so we create a new one
GLuint Texture = 0;
{
sf::Image Image;
if (!Image.LoadFromFile("datas/opengl/texture.jpg"))
return EXIT_FAILURE;
glGenTextures(1, &Texture);
glBindTexture(GL_TEXTURE_2D, Texture);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, Image.GetWidth(), Image.GetHeight(), GL_RGBA, GL_UNSIGNED_BYTE, Image.GetPixelsPtr());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
}
// Enable Z-buffer read and write
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
glClearDepth(1.f);
// Setup a perspective projection
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90.f, 1.f, 1.f, 500.f);
// Bind our texture
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, Texture);
glColor4f(1.f, 1.f, 1.f, 1.f);
// Create a clock for measuring the time elapsed
sf::Clock Clock;
// Start game loop
while (App.IsOpened())
{
// Process events
sf::Event Event;
while (App.GetEvent(Event))
{
// Close window : exit
if (Event.Type == sf::Event::Closed)
App.Close();
// Escape key : exit
if ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape))
App.Close();
// Adjust the viewport when the window is resized
if (Event.Type == sf::Event::Resized)
glViewport(0, 0, Event.Size.Width, Event.Size.Height);
}
// Draw background
App.Draw(Background);
// Clear depth buffer
glClear(GL_DEPTH_BUFFER_BIT);
// Apply some transformations
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.f, 0.f, -200.f);
glRotatef(Clock.GetElapsedTime() * 50, 1.f, 0.f, 0.f);
glRotatef(Clock.GetElapsedTime() * 30, 0.f, 1.f, 0.f);
glRotatef(Clock.GetElapsedTime() * 90, 0.f, 0.f, 1.f);
// Draw a cube
glBegin(GL_QUADS);
glTexCoord2f(0, 0); glVertex3f(-50.f, -50.f, -50.f);
glTexCoord2f(0, 1); glVertex3f(-50.f, 50.f, -50.f);
glTexCoord2f(1, 1); glVertex3f( 50.f, 50.f, -50.f);
glTexCoord2f(1, 0); glVertex3f( 50.f, -50.f, -50.f);
glTexCoord2f(0, 0); glVertex3f(-50.f, -50.f, 50.f);
glTexCoord2f(0, 1); glVertex3f(-50.f, 50.f, 50.f);
glTexCoord2f(1, 1); glVertex3f( 50.f, 50.f, 50.f);
glTexCoord2f(1, 0); glVertex3f( 50.f, -50.f, 50.f);
glTexCoord2f(0, 0); glVertex3f(-50.f, -50.f, -50.f);
glTexCoord2f(0, 1); glVertex3f(-50.f, 50.f, -50.f);
glTexCoord2f(1, 1); glVertex3f(-50.f, 50.f, 50.f);
glTexCoord2f(1, 0); glVertex3f(-50.f, -50.f, 50.f);
glTexCoord2f(0, 0); glVertex3f(50.f, -50.f, -50.f);
glTexCoord2f(0, 1); glVertex3f(50.f, 50.f, -50.f);
glTexCoord2f(1, 1); glVertex3f(50.f, 50.f, 50.f);
glTexCoord2f(1, 0); glVertex3f(50.f, -50.f, 50.f);
glTexCoord2f(0, 1); glVertex3f(-50.f, -50.f, 50.f);
glTexCoord2f(0, 0); glVertex3f(-50.f, -50.f, -50.f);
glTexCoord2f(1, 0); glVertex3f( 50.f, -50.f, -50.f);
glTexCoord2f(1, 1); glVertex3f( 50.f, -50.f, 50.f);
glTexCoord2f(0, 1); glVertex3f(-50.f, 50.f, 50.f);
glTexCoord2f(0, 0); glVertex3f(-50.f, 50.f, -50.f);
glTexCoord2f(1, 0); glVertex3f( 50.f, 50.f, -50.f);
glTexCoord2f(1, 1); glVertex3f( 50.f, 50.f, 50.f);
glEnd();
// Draw some text on top of our OpenGL object
sf::String Text("This is a rotating cube");
Text.SetPosition(250.f, 300.f);
Text.SetColor(sf::Color(128, 0, 128));
App.Draw(Text);
// Finally, display the rendered frame on screen
App.Display();
}
// Don't forget to destroy our texture
glDeleteTextures(1, &Texture);
return EXIT_SUCCESS;
}
Note: And do not use glaux - it is terribly lost in time.
Note: demo uses .jpg image format. This one is better than .gif, because it is more lightweight and, afaik, widespreaded and easier to implement in application.

Answer 2

It's kind of overkill if you just want to support GIF, but DevIL supports GIF (among many others). There are lighter solutions around as well. Alternatively, you can get the GIF spec, and write it yourself (makes a nice, relaxing afternoon project as I recall).