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/* PROGRAMMER: VG4
 * DATE: 08.06.2011
 * PURPOSE: OpenGL initializing in
 *          animation system.
 *
 * Автор: Виталий Галинский.
 * Дата:  08.06.2011
 * Летняя учебно-исследовательская практика ФМЛ № 30, 2011 год.
 * Группа компьютерной графики.
 * Copyright © 2011
 *   Computer Graphics Support Group of 30 Phys-Math Lyceum
 * © 2011 Физико-математический лицей № 30, Санкт-Петербург.
 */

/* FILE NAME: VG4ANIM.H */
. . .
 
#pragma warning(disable: 4244 4996)
#include <windows.h>
 
#include <gl/gl.h>
#include <gl/glu.h>
#pragma comment(lib, "opengl32")
#pragma comment(lib, "glu32")

. . .
/* Animation parameters representation type */
typedef struct tagvg4ANIM
{
  HWND hWnd;         /* Window handle */
  HDC hDC;           /* Window device context handle */
  HGLRC hRC;         /* Rendering context */
  . . .
} vg4ANIM;

/* FILE NAME: VG4ANIM.C */
. . .
BOOL VG4_Init( HWND hWnd )
{
  INT i;
  PIXELFORMATDESCRIPTOR pfd = {0};
 
  . . .
  /* Setup frame buffer */
  VG4_Anim.hDC = GetDC(hWnd);
 
  /*** OpenGL initialization ***/
 
  /* Setup pixel format */
  pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
  pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_SUPPORT_GDI |
                PFD_DOUBLEBUFFER;
  pfd.iPixelType = PFD_TYPE_RGBA;
  pfd.cColorBits = 32;
  // pfd.cDepthBits = 24;
  // pfd.cStencilBits = 8;

  /* Set pixel format to window DC */
  i = ChoosePixelFormat(VG4_Anim.hDC, &pfd);
  DescribePixelFormat(VG4_Anim.hDC, i,
    sizeof(PIXELFORMATDESCRIPTOR), &pfd);
 
  SetPixelFormat(VG4_Anim.hDC, i, &pfd);
 
  /*** Setup OpenGL ***/
  VG4_Anim.hRC = wglCreateContext(VG4_Anim.hDC);
  wglMakeCurrent(VG4_Anim.hDC, VG4_Anim.hRC);
  . . .
} /* End of 'VG4_Init' function */
 
/* Close animation system function */
VOID VG4_Close( VOID )
{
  /* Remove contexts */
  wglMakeCurrent(NULL, NULL);
  wglDeleteContext(VG4_Anim.hRC);
  ReleaseDC(VG4_Anim.hWnd, VG4_Anim.hDC);
  . . .
} /* End of 'VG4_Close' function */
 
/* Handle resize event function */
VOID VG4_Resize( INT Width, INT Height )
{
  . . .
  /* Setup output frame rectangle */
  glViewport(0, 0, Width, Height);
 
  /* Setup projection */
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(-1.0 * Width / Height, 1.0 * Width / Height, -1, 1, -1, 1);
  glMatrixMode(GL_MODELVIEW);
} /* End of 'VG4_Resize' function */
 
/* Handle render frame function */
VOID VG4_Render( VOID )
{
  if (!VG4_IsInit)
    return;
 
  /* Handle OpenGL frame */
  glClear(GL_COLOR_BUFFER_BIT);
 
  /* Call user render function */
  if (VG4_RenderFunc != NULL)
    VG4_RenderFunc(&VG4_Anim);
  glFinish();
} /* End of 'VG4_Render' function */
 
/* Copy current frame to specified device context function */
VOID VG4_CopyFrame( HDC hDC )
{
  /* Copy OpenGL frame to screen */
  SwapBuffers(hDC);
 
  /* Increase frame count */
  VG4_FrameCount++;
} /* End of 'VG4_CopyFrame' function */

/* FILE NAME: VG4FOGL.C */
. . .
static VOID Render( vg4ANIM *Ani )
{
  static CHAR Buf[100];
 
  sprintf(Buf, "FPS: %.3f ", Ani->FPS);
  SetWindowText(Ani->hWnd, Buf);
 
  glLoadIdentity();
 
  glRotated(Ani->JAxisX * 90, 1, 0, 0);
  glRotated(Ani->JAxisY * 90, 0, 1, 0);
  glRotated(Ani->JAxisZ * 90, 0, 0, 1);
  glColor3d(1, 0, 0);
  glRectd(0, 0, 0.5, 0.5);
 
  glLoadIdentity();
  glColor3d(1, 1, 0);
  glRectd(0, 0, -0.5, -0.5);
} /* End of 'Render' function */