// (c) Mahesh Venkitachalam 1997 http://home.att.net/~bighesh
unit frmMain;
interface
uses
Windows, Messages, Classes, Graphics, Forms, ExtCtrls, Controls,
OpenGL;
type
TfrmGL = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormResize(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure FormKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
private
DC: HDC;
hrc: HGLRC;
qobj : GLUquadricObj ;
sphere, mol, cyl : GLInt;
procedure MakeSphere;
procedure MakeCylinder;
procedure MakeMol;
procedure SetDCPixelFormat;
protected
procedure WMPaint(var Msg: TWMPaint); message WM_PAINT;
end;
const
cyl_amb_dif : Array [0..3] of GLFloat = (0.0,1.0,0.0,1.0);
cyl_spec : Array [0..3] of GLFloat = (1.0,1.0,1.0,1.0);
sph_amb_dif : Array [0..3] of GLFloat = (0.8,0.2,0.5,1.0);
sph_spec : Array [0..3] of GLFloat = (1.0,1.0,1.0,1.0);
var
frmGL: TfrmGL;
implementation
uses mmSystem;
{$R *.DFM}
procedure TfrmGL.MakeSphere;
begin
sphere := glGenLists(1);
glNewList(sphere,GL_COMPILE);
glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,@sph_amb_dif);
glMaterialfv(GL_FRONT,GL_SPECULAR,@sph_spec);
glMaterialf(GL_FRONT,GL_SHININESS,100.0);
gluSphere(qobj,2.5,20,20);
glEndList;
end;
procedure TfrmGL.MakeCylinder;
begin
cyl := glGenLists(1);
glNewList(cyl,GL_COMPILE);
glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,@cyl_amb_dif);
glMaterialfv(GL_FRONT,GL_SPECULAR,@cyl_spec);
glMaterialf(GL_FRONT,GL_SHININESS,100.0);
gluCylinder(qobj,0.5,0.5,10.0,20,20);
glEndList;
end;
procedure TfrmGL.MakeMol;
var
i : Integer;
begin
mol := glGenLists(1);
glNewList(mol,GL_COMPILE);
glCallList(sphere);
glCallList(cyl);
glPushMatrix;
glRotatef(270.0,1.0,0.0,0.0);
For i := 0 to 3 do begin
glPushMatrix;
glRotatef(120.0*i,0.0,1.0,0.0);
glCallList(cyl);
glTranslatef(0.0,0.0,10.0);
glCallList(sphere);
glPopMatrix;
end;
glPopMatrix;
glTranslatef(0.0,0.0,10.0);
glPushMatrix;
glRotatef(270.0,1.0,0.0,0.0);
For i := 0 to 3 do begin
glPushMatrix;
glRotatef(60.0+120.0*i,0.0,1.0,0.0);
glCallList(cyl);
glTranslatef(0.0,0.0,10.0);
glCallList(sphere);
glPopMatrix;
end;
glPopMatrix;
glEndList;
end;
procedure TfrmGL.WMPaint(var Msg: TWMPaint);
var
ps : TPaintStruct;
aspect : GLFloat;
begin
BeginPaint(Handle, ps);
aspect := Width / Height;
glEnable(GL_SCISSOR_TEST);
glScissor(0,0,round(Width/2),Height);
glClearColor(0.55,0.7,0.7,0.0);
glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glMatrixMode(GL_PROJECTION);
glLoadIdentity;
gluPerspective(60.0, aspect, 5.0, 70.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity;
glViewport(0,0,round(Width/2),Height);
glPushMatrix;
gluLookAt(25.0,25.0,50.0,25.0,25.0,20.0,0.0,1.0,0.0);
glTranslatef(25.0,25.0,10.0);
glCallList(mol);
glPopMatrix;
// View 2
glEnable(GL_SCISSOR_TEST);
glScissor(round(Width/2) + 1,round(Height/2) +1,
round(Width/2), round(Height/2));
glClearColor(0.77,0.7,0.7,0.0);
glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glMatrixMode(GL_PROJECTION);
glLoadIdentity;
gluPerspective(60.0, aspect, 5.0, 70.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity;
glViewport(round(Width/2) + 1,round(Height/2) +1,round(Width/2),
round(Height/2));
glPushMatrix;
gluLookAt(25.0,50.0,50.0,25.0,25.0,20.0,0.0,1.0,0.0);
glTranslatef(25.0,25.0,10.0);
glCallList(mol);
glPopMatrix;
// View 3
glEnable(GL_SCISSOR_TEST);
glScissor(round(Width/2) +1,0,round(Width/2),round(Height/2));
glClearColor(0.0,0.6,0.7,0.0);
glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glMatrixMode(GL_PROJECTION);
glLoadIdentity;
gluPerspective (60.0, aspect, 5.0, 70.0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity;
glViewport(round(Width/2) +1,0,round(Width/2),round(Height/2));
glPushMatrix;
gluLookAt(0.0,25.0,50.0,25.0,25.0,20.0,0.0,1.0,0.0);
glTranslatef(25.0,25.0,10.0);
glCallList(mol);
glPopMatrix;
SwapBuffers(DC);
EndPaint(Handle, ps);
end;
procedure TfrmGL.FormCreate(Sender: TObject);
begin
DC := GetDC(Handle);
SetDCPixelFormat;
hrc := wglCreateContext(DC);
wglMakeCurrent(DC, hrc);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_DEPTH_TEST);
qObj := gluNewQuadric;
gluQuadricDrawStyle(qobj,GLU_FILL);
gluQuadricNormals(qobj,GLU_SMOOTH);
MakeSphere;
MakeCylinder;
MakeMol;
end;
procedure TfrmGL.FormKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
If Key = VK_ESCAPE then Close;
end;
procedure TfrmGL.SetDCPixelFormat;
var
nPixelFormat: Integer;
pfd: TPixelFormatDescriptor;
begin
FillChar(pfd, SizeOf(pfd), 0);
with pfd do begin
nSize := sizeof(pfd);
nVersion := 1;
dwFlags := PFD_DRAW_TO_WINDOW or
PFD_SUPPORT_OPENGL or
PFD_DOUBLEBUFFER;
iPixelType:= PFD_TYPE_RGBA;
cColorBits:= 24;
cDepthBits:= 32;
iLayerType:= PFD_MAIN_PLANE;
end;
nPixelFormat := ChoosePixelFormat(DC, @pfd);
SetPixelFormat(DC, nPixelFormat, @pfd);
DescribePixelFormat(DC, nPixelFormat, sizeof(TPixelFormatDescriptor), pfd);
end;
procedure TfrmGL.FormResize(Sender: TObject);
begin
InvalidateRect(Handle, nil, False);
end;
procedure TfrmGL.FormDestroy(Sender: TObject);
begin
wglMakeCurrent(0, 0);
wglDeleteContext(hrc);
ReleaseDC(Handle, DC);
gluDeleteQuadric (qObj);
glDeleteLists (sphere, 1);
glDeleteLists (mol, 1);
glDeleteLists (cyl, 1);
end;
end.