Rearrange graphics projects into subdirectory

cpp/graphics/opengl-cmake/src/lib-opengl-test.cpp

@@ -0,0 +1,144 @@
+
+#include <lib-opengl-test.hpp>
+
+#include <GL/freeglut.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+#include <cstdio>
+
+//Screen constants
+const int SCREEN_WIDTH = 640;
+const int SCREEN_HEIGHT = 480;
+const int SCREEN_FPS = 60;
+
+//Color modes
+const int COLOR_MODE_CYAN = 0;
+const int COLOR_MODE_MULTI = 1;
+
+//The current color rendering mode
+int gColorMode = 0;
+
+//The projection scale
+GLfloat gProjectionScale = 1.f;
+
+void runMainLoop( int val )
+{
+  //Frame logic
+  update();
+  render();
+
+  //Run frame one more time
+  glutTimerFunc( 1000 / SCREEN_FPS, runMainLoop, val );
+}
+
+bool initGL()
+{
+  //Initialize Projection Matrix
+  glMatrixMode( GL_PROJECTION );
+  glLoadIdentity();
+  glOrtho( 0.0, SCREEN_WIDTH, SCREEN_HEIGHT, 0.0, 1.0, -1.0 );
+
+  //Initialize Modelview Matrix
+  glMatrixMode( GL_MODELVIEW );
+  glLoadIdentity();
+
+  //Initialize clear color
+  glClearColor( 0.f, 0.f, 0.f, 1.f );
+
+  //Check for error
+  GLenum error = glGetError();
+  if( error != GL_NO_ERROR )
+  {
+    printf( "Error initializing OpenGL! %s\n", gluErrorString( error ) );
+    return false;
+  }
+
+  return true;
+}
+
+void update()
+{
+
+}
+
+void render()
+{
+  //Clear color buffer
+  glClear( GL_COLOR_BUFFER_BIT );
+
+  //Reset modelview matrix
+  glMatrixMode( GL_MODELVIEW );
+  glLoadIdentity();
+
+  //Move to center of the screen
+  glTranslatef( SCREEN_WIDTH / 2.f, SCREEN_HEIGHT / 2.f, 0.f );
+
+  //Render quad
+  if( gColorMode == COLOR_MODE_CYAN )
+  {
+    //Solid Cyan
+    glBegin( GL_QUADS );
+    glColor3f( 0.f, 1.f, 1.f );
+    glVertex2f( -50.f, -50.f );
+    glVertex2f(  50.f, -50.f );
+    glVertex2f(  50.f,  50.f );
+    glVertex2f( -50.f,  50.f );
+    glEnd();
+  }
+  else
+  {
+    //RYGB Mix
+    glBegin( GL_QUADS );
+    glColor3f( 1.f, 0.f, 0.f ); glVertex2f( -50.f, -50.f );
+    glColor3f( 1.f, 1.f, 0.f ); glVertex2f(  50.f, -50.f );
+    glColor3f( 0.f, 1.f, 0.f ); glVertex2f(  50.f,  50.f );
+    glColor3f( 0.f, 0.f, 1.f ); glVertex2f( -50.f,  50.f );
+    glEnd();
+  }
+
+  //Update screen
+  glutSwapBuffers();
+}
+
+void handleKeys( unsigned char key, int x, int y )
+{
+  //If the user presses q
+  if( key == 'q' )
+  {
+    //Toggle color mode
+    if( gColorMode == COLOR_MODE_CYAN )
+    {
+      gColorMode = COLOR_MODE_MULTI;
+    }
+    else
+    {
+      gColorMode = COLOR_MODE_CYAN;
+    }
+  }
+  else if( key == 'e' )
+  {
+    //Cycle through projection scales
+    if( gProjectionScale == 1.f )
+    {
+      //Zoom out
+      gProjectionScale = 2.f;
+    }
+    else if( gProjectionScale == 2.f )
+    {
+      //Zoom in
+      gProjectionScale = 0.5f;
+    }
+    else if( gProjectionScale == 0.5f )
+    {
+      //Regular zoom
+      gProjectionScale = 1.f;
+    }
+
+    //Update projection matrix
+    glMatrixMode( GL_PROJECTION );
+    glLoadIdentity();
+    glOrtho( 0.0, SCREEN_WIDTH * gProjectionScale, SCREEN_HEIGHT * gProjectionScale, 0.0, 1.0, -1.0 );
+  }
+}
+

cpp/graphics/opengl-cmake/src/lib-opengl-test.hpp

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+
+#ifndef LIB_OPENGL_TEST_HPP
+#define LIB_OPENGL_TEST_HPP
+
+#include <GL/freeglut.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+void runMainLoop( int val );
+/*
+Pre Condition:
+ -Initialized freeGLUT
+Post Condition:
+ -Calls the main loop functions and sets itself to be called back in 1000 / SCREEN_FPS milliseconds
+Side Effects:
+ -Sets glutTimerFunc
+*/
+
+bool initGL();
+void update();
+void render();
+
+void handleKeys( unsigned char key, int x, int y );
+
+#endif // LIB_OPENGL_TEST_HPP