Added support for the CMake build system

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1550 4e206d99-4929-0410-ac5d-dfc041789085

examples/opengl/OpenGL.cpp

@@ -0,0 +1,156 @@
+
+////////////////////////////////////////////////////////////
+// Headers
+////////////////////////////////////////////////////////////
+#include <SFML/Graphics.hpp>
+#include <SFML/OpenGL.hpp>
+#include <iostream>
+
+////////////////////////////////////////////////////////////
+/// Entry point of application
+///
+/// \return Application exit code
+///
+////////////////////////////////////////////////////////////
+int main()
+{
+    // Create the main window
+    sf::RenderWindow window(sf::VideoMode(800, 600), "SFML OpenGL");
+
+    // Create a sprite for the background
+    sf::Image backgroundImage;
+    if (!backgroundImage.LoadFromFile("resources/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 from the image pixels
+    GLuint texture = 0;
+    {
+        sf::Image image;
+        if (!image.LoadFromFile("resources/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 (window.IsOpened())
+    {
+        // Process events
+        sf::Event event;
+        while (window.GetEvent(event))
+        {
+            // Close window : exit
+            if (event.Type == sf::Event::Closed)
+                window.Close();
+
+            // Escape key : exit
+            if ((event.Type == sf::Event::KeyPressed) && (event.Key.Code == sf::Key::Escape))
+                window.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 the background
+        window.SaveGLStates();
+        window.Draw(background);
+        window.RestoreGLStates();
+
+        // Activate the window before using OpenGL commands.
+        // This is useless here because we have only one window which is
+        // always the active one, but don't forget it if you use multiple windows
+        window.SetActive();
+
+        // Clear the depth buffer
+        glClear(GL_DEPTH_BUFFER_BIT);
+
+        // We get the position of the mouse cursor, so that we can move the box accordingly
+        float x =  window.GetInput().GetMouseX() * 200.f / window.GetWidth()  - 100.f;
+        float y = -window.GetInput().GetMouseY() * 200.f / window.GetHeight() + 100.f;
+
+        // Apply some transformations
+        glMatrixMode(GL_MODELVIEW);
+        glLoadIdentity();
+        glTranslatef(x, y, -100.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
+        float size = 20.f;
+        glBegin(GL_QUADS);
+
+            glTexCoord2f(0, 0); glVertex3f(-size, -size, -size);
+            glTexCoord2f(0, 1); glVertex3f(-size,  size, -size);
+            glTexCoord2f(1, 1); glVertex3f( size,  size, -size);
+            glTexCoord2f(1, 0); glVertex3f( size, -size, -size);
+
+            glTexCoord2f(0, 0); glVertex3f(-size, -size, size);
+            glTexCoord2f(0, 1); glVertex3f(-size,  size, size);
+            glTexCoord2f(1, 1); glVertex3f( size,  size, size);
+            glTexCoord2f(1, 0); glVertex3f( size, -size, size);
+
+            glTexCoord2f(0, 0); glVertex3f(-size, -size, -size);
+            glTexCoord2f(0, 1); glVertex3f(-size,  size, -size);
+            glTexCoord2f(1, 1); glVertex3f(-size,  size,  size);
+            glTexCoord2f(1, 0); glVertex3f(-size, -size,  size);
+
+            glTexCoord2f(0, 0); glVertex3f(size, -size, -size);
+            glTexCoord2f(0, 1); glVertex3f(size,  size, -size);
+            glTexCoord2f(1, 1); glVertex3f(size,  size,  size);
+            glTexCoord2f(1, 0); glVertex3f(size, -size,  size);
+
+            glTexCoord2f(0, 1); glVertex3f(-size, -size,  size);
+            glTexCoord2f(0, 0); glVertex3f(-size, -size, -size);
+            glTexCoord2f(1, 0); glVertex3f( size, -size, -size);
+            glTexCoord2f(1, 1); glVertex3f( size, -size,  size);
+
+            glTexCoord2f(0, 1); glVertex3f(-size, size,  size);
+            glTexCoord2f(0, 0); glVertex3f(-size, size, -size);
+            glTexCoord2f(1, 0); glVertex3f( size, size, -size);
+            glTexCoord2f(1, 1); glVertex3f( size, size,  size);
+
+        glEnd();
+
+        // Draw some text on top of our OpenGL object
+        window.SaveGLStates();
+        sf::Text text("SFML / OpenGL demo");
+        text.SetPosition(250.f, 450.f);
+        text.SetColor(sf::Color(255, 255, 255, 170));
+        window.Draw(text);
+        window.RestoreGLStates();
+
+        // Finally, display the rendered frame on screen
+        window.Display();
+    }
+
+    // Don't forget to destroy our texture
+    glDeleteTextures(1, &texture);
+
+    return EXIT_SUCCESS;
+}