added rotate cube example

Makefile

@@ -1,6 +1,9 @@
 CC=gcc
 
-all: fps_counter
+all: fps_counter rotate_cube
 
 fps_counter:
 	$(CC) fps_counter.c -lglfw -lGL -o fps_counter
+
+rotate_cube:
+	$(CC) rotate_cube.c -lglfw -lGL -o rotate_cube.exe

Makefile.win32

@@ -1,11 +1,14 @@
 CC=tcc
 CFLAGS= -I./win32/include -L./win32/lib
 
-all: fps_counter windows_icon
+all: fps_counter rotate_cube windows_icon
 
 fps_counter:
 	$(CC) $(CFLAGS) fps_counter.c -lglfw3 -lopengl32 -o fps_counter.exe
 
+rotate_cube:
+	$(CC) $(CFLAGS) rotate_cube.c -lglfw3 -lopengl32 -o rotate_cube.exe
+
 windows_icon: icon.o
 	$(CC) $(CFLAGS) windows_icon.c icon.o -lglfw3 -lopengl32 -o windows_icon.exe
 

rotate_cube.c

@@ -0,0 +1,125 @@
+/*
+  GLFW3 rotate cube
+  Source: https://github.com/IIIypuk/glfw-examples
+*/
+
+#include <stdio.h>
+#ifndef __WIN32
+  #include <windows.h>
+#endif
+#include <GLFW/glfw3.h>
+
+void keyboard_callback(GLFWwindow *window, int key, int scancode,
+  int action, int mods);
+
+int rotate_y = 0;
+int rotate_x = 0;
+
+#ifndef __WIN32
+int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInst,
+  LPSTR lpszCmdLine, int nShowCmd)
+#else
+int main(int argc, char const *argv[])
+#endif
+{
+  GLFWwindow *window;
+
+  if (!glfwInit())
+    return -1;
+
+  glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+  window = glfwCreateWindow(320, 320, "Rorate Cube", NULL, NULL);
+  
+  if (!window)
+  {
+    glfwTerminate();
+    return -1;
+  }
+
+  glfwMakeContextCurrent(window);
+
+  glEnable(GL_DEPTH_TEST);
+
+  while (!glfwWindowShouldClose(window))
+  {
+    glfwSetKeyCallback(window, keyboard_callback);
+
+    glClearColor(0, 0, 0, 0);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glLoadIdentity();
+ 
+    glRotatef(rotate_x, 1.0, 0.0, 0.0);
+    glRotatef(rotate_y, 0.0, 1.0, 0.0);
+    
+    glBegin(GL_POLYGON); // Yellow side - FRONT
+      glColor3f(1.0,  1.0,  0.0);
+      glVertex3f( 0.5, -0.5, -0.5);
+      glVertex3f( 0.5,  0.5, -0.5);
+      glVertex3f(-0.5,  0.5, -0.5);
+      glVertex3f(-0.5, -0.5, -0.5);
+    glEnd();
+   
+    glBegin(GL_POLYGON); // White side - BACK
+      glColor3f(1.0,  1.0, 1.0);
+      glVertex3f( 0.5, -0.5, 0.5);
+      glVertex3f( 0.5,  0.5, 0.5);
+      glVertex3f(-0.5,  0.5, 0.5);
+      glVertex3f(-0.5, -0.5, 0.5);
+    glEnd();
+    
+    glBegin(GL_POLYGON); // Purple side - RIGHT
+      glColor3f(1.0,  0.0,  1.0);
+      glVertex3f(0.5, -0.5, -0.5);
+      glVertex3f(0.5,  0.5, -0.5);
+      glVertex3f(0.5,  0.5,  0.5);
+      glVertex3f(0.5, -0.5,  0.5);
+    glEnd();
+   
+    glBegin(GL_POLYGON); // Green side - LEFT
+      glColor3f(0.0,  1.0,  0.0);
+      glVertex3f(-0.5, -0.5,  0.5);
+      glVertex3f(-0.5,  0.5,  0.5);
+      glVertex3f(-0.5,  0.5, -0.5);
+      glVertex3f(-0.5, -0.5, -0.5);
+    glEnd();
+   
+    glBegin(GL_POLYGON); // Blue side - TOP
+      glColor3f(0.0,  0.0,  1.0);
+      glVertex3f( 0.5,  0.5,  0.5);
+      glVertex3f( 0.5,  0.5, -0.5);
+      glVertex3f(-0.5,  0.5, -0.5);
+      glVertex3f(-0.5,  0.5,  0.5);
+    glEnd();
+   
+    glBegin(GL_POLYGON); // Red side - BOTTOM
+      glColor3f(1.0,  0.0,  0.0);
+      glVertex3f( 0.5, -0.5, -0.5);
+      glVertex3f( 0.5, -0.5,  0.5);
+      glVertex3f(-0.5, -0.5,  0.5);
+      glVertex3f(-0.5, -0.5, -0.5);
+    glEnd();
+   
+    glfwSwapBuffers(window);
+    glfwPollEvents();
+  }
+
+  glfwTerminate();
+  return 0;
+}
+
+void keyboard_callback(GLFWwindow* window, int key, int scancode,
+  int action, int mods)
+{
+  if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+    glfwSetWindowShouldClose(window, GL_TRUE);
+
+  if (key == GLFW_KEY_UP && action == GLFW_PRESS)
+    rotate_x += 5;
+  if (key == GLFW_KEY_DOWN && action == GLFW_PRESS)
+    rotate_x -= 5;
+  if (key == GLFW_KEY_RIGHT && action == GLFW_PRESS)
+    rotate_y -= 5;
+  if (key == GLFW_KEY_LEFT && action == GLFW_PRESS)
+    rotate_y += 5;
+}