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uSkyBox.pas
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uSkyBox.pas
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unit uSkyBox;
interface
uses OpenGL, uConst{, uOpenGL}, uCamera, u3DTypes;
const
// de skybox
texLeft = 0;
texRight = 1;
texBottom = 2;
texTop = 3;
texNear = 4;
texFar = 5;
planeLeftT = 0;
planeLeftB = 1;
planeRightT = 2;
planeRightB = 3;
planeBottom = 4;
planeTop = 5;
planeNearT = 6;
planeNearB = 7;
planeFarT = 8;
planeFarB = 9;
type
(*
TTexture = record
Name: string; // bestandsnaam van de texture
Handle: word; // OpenGL texture handle (GLuint)
Blend: Single; // De dekking van de texture op het object
end;
*)
PSkyBox = ^TSkyBox;
TSkyBox = class(TObject)
private
OGL: Pointer; //POGL; // het OGL parent object
// tbv. de properties
local_Active, // actief
local_Paused, // gepauzeerd
local_FakeFog: boolean; // mist
//-- /properties
Texture: array[texLeft..texFar] of TTexture; // Left,Right,Bottom,Top,Near,Far, clouds
DisplayList: GLuint;
// tbv. de properties
procedure SetActive(const Value: boolean);
procedure SetPaused(const Value: boolean);
procedure SetFakeFog(const Value: boolean);
function TextureHandleForPlane(PlaneNr: integer): GLuint;
//
procedure CreateDisplayList;
procedure DeleteDisplayList;
published
property Active: boolean read local_Active write SetActive;
property Paused: boolean read local_Paused write SetPaused;
property FakeFog: boolean read local_FakeFog write SetFakeFog;
public
WireFrame: boolean;
// object
constructor Create(OGL_parent: Pointer); //POGL
destructor Destroy; override;
//
procedure ToggleActive;
procedure TogglePaused;
// kan alleen als OpenGL actief is (geldige RC nodig)
function InitTextures(FilenameLeft, FilenameRight, FilenameBottom, FilenameTop, FilenameNear, FilenameFar: string) : boolean; overload;
function InitTextures(FilenamePrefix: string) : boolean; overload;
procedure FreeTextures; //kan alleen als OpenGL actief is (geldige RC nodig)
//
procedure Render(const Camera: TCamera);
end;
(*
var SkyBox: TSkyBox;
*)
implementation
uses uCalc, uOpenGL, uTexture;
{ TSkyBox }
//-- properties lezen en aanpassen/schijven
procedure TSkyBox.SetActive(const Value: boolean);
begin
if Value <> local_Active then
local_Active := Value;
end;
procedure TSkyBox.SetPaused(const Value: boolean);
begin
if Value <> local_Paused then
local_Paused := Value;
end;
procedure TSkyBox.SetFakeFog(const Value: boolean);
begin
if Value <> local_FakeFog then
local_FakeFog := Value;
end;
//--
procedure TSkyBox.ToggleActive;
begin
local_Active := not local_Active;
end;
procedure TSkyBox.TogglePaused;
begin
local_Paused := not local_Paused;
end;
//-- /properties
constructor TSkyBox.Create(OGL_parent: Pointer); //POGL
var i: integer;
begin
// Object initiëren
inherited Create;
OGL := OGL_parent;
local_Active := false;
local_Paused := false;
// Data initialiseren
for i:=texLeft to texFar do Texture[i].Handle := 0;
DisplayList := 0;
end;
destructor TSkyBox.Destroy;
begin
// Data finaliseren
FreeTextures;
// Object finaliseren
inherited;
end;
function TSkyBox.InitTextures(FilenameLeft, FilenameRight, FilenameBottom, FilenameTop, FilenameNear, FilenameFar: string) : boolean;
var i: integer;
begin
if not POGL(OGL)^.Active then begin
Result := false;
Exit;
end;
// de huidige displaylist verwijderen
DeleteDisplayList;
// de textures van de skybox
Texture[texLeft].Name := FilenameLeft;
Texture[texRight].Name := FilenameRight;
Texture[texBottom].Name := FilenameBottom;
Texture[texTop].Name := FilenameTop;
Texture[texNear].Name := FilenameNear;
Texture[texFar].Name := FilenameFar;
// textures laden en aanmaken
for i:=texLeft to texFar do
if Texture[i].Name <> '' then begin
Texture[i].Handle := POGL(OGL)^.Textures.LoadTexture(Texture[i].Name, 1.0);
if Texture[i].Handle = 0 then begin
Texture[i].Name := '';
Result := false;
Active := false;
FreeTextures;
Exit;
end;
end;
// Een nieuwe displaylist comipleren
CreateDisplayList;
//
Result := true;
end;
function TSkyBox.InitTextures(FilenamePrefix: string): boolean;
var i: integer;
begin
if not POGL(OGL)^.Active then begin
Result := false;
Exit;
end;
// de huidige displaylist verwijderen
DeleteDisplayList;
// de textures van de skybox
Texture[texLeft].Name := FilenamePrefix +'Left'; {.bmp}
Texture[texRight].Name := FilenamePrefix +'Right';
Texture[texBottom].Name := FilenamePrefix +'Bottom';
Texture[texTop].Name := FilenamePrefix +'Top';
Texture[texNear].Name := FilenamePrefix +'Front';
Texture[texFar].Name := FilenamePrefix +'Back';
// textures laden en aanmaken
for i:=texLeft to texFar do
if Texture[i].Name <> '' then begin
Texture[i].Handle := POGL(OGL)^.Textures.LoadTexture(Texture[i].Name, 1.0);
if Texture[i].Handle = 0 then begin
Texture[i].Name := '';
FreeTextures;
Result := false;
Active := false;
Exit;
end;
end;
// Een nieuwe displaylist comipleren
CreateDisplayList;
//
Result := true;
end;
procedure TSkyBox.FreeTextures;
var i: integer;
begin
// de OpenGL-displaylist verwijderen
DeleteDisplayList;
// de textures wissen
for i:=texLeft to texFar do begin
POGL(OGL)^.Textures.DeleteTexture(Texture[i].Handle);
Texture[i].Name := '';
end;
end;
procedure TSkyBox.Render(const Camera: TCamera);
begin
if (not Active) or Paused then Exit;
glDisable(GL_FOG);
glPushMatrix;
// Alleen op de positie van de camera.Eye verschuiven..niet roteren
with Camera.Position do glTranslatef(X, Y, Z);
// de displaylist uitvoeren
if DisplayList<>0 then glCallList(DisplayList);
glPopMatrix;
if POGL(OGL)^.Fog then glEnable(GL_FOG);
end;
function TSkyBox.TextureHandleForPlane(PlaneNr: integer): GLuint;
begin
case PlaneNr of
(*
planeLeftT : Result := Texture[texLeft].Handle;
planeLeftB : Result := 0{Texture[texLeft].Handle};
planeRightT : Result := Texture[texRight].Handle;
planeRightB : Result := 0{Texture[texRight].Handle};
planeBottom : Result := 0{Texture[texBottom].Handle};
planeTop : Result := Texture[texTop].Handle;
planeNearT : Result := Texture[texNear].Handle;
planeNearB : Result := 0{Texture[texNear].Handle};
planeFarT : Result := Texture[texFar].Handle;
planeFarB : Result := 0{Texture[texFar].Handle};
*)
planeLeftT : Result := Texture[texLeft].Handle;
planeLeftB : Result := Texture[texLeft].Handle;
planeRightT : Result := Texture[texRight].Handle;
planeRightB : Result := Texture[texRight].Handle;
planeBottom : Result := Texture[texBottom].Handle;
planeTop : Result := Texture[texTop].Handle;
planeNearT : Result := Texture[texNear].Handle;
planeNearB : Result := Texture[texNear].Handle;
planeFarT : Result := Texture[texFar].Handle;
planeFarB : Result := Texture[texFar].Handle;
else
Result := Texture[texTop].Handle;
end;
end;
procedure TSkyBox.CreateDisplayList;
const NLen = -1.0; //normalen met richting naar binnen
//de vertices // 7---------6
VertexArray: array[0..11,0..2] of single = ((-SkyBoxSize, 0, SkyBoxSize), // /| /| y
( SkyBoxSize, 0, SkyBoxSize), // / | / | |
( SkyBoxSize, 0.5*SkyBoxSize, SkyBoxSize), // 3---------2 | |___x
(-SkyBoxSize, 0.5*SkyBoxSize, SkyBoxSize), // | | | | /
(-SkyBoxSize, 0, -SkyBoxSize), // | 4------|--5 z
( SkyBoxSize, 0, -SkyBoxSize), // | /| | /|
( SkyBoxSize, 0.5*SkyBoxSize, -SkyBoxSize), // |/ | |/ |
(-SkyBoxSize, 0.5*SkyBoxSize, -SkyBoxSize), // 0---------1 |
(-SkyBoxSize, -0.5*SkyBoxSize, SkyBoxSize), // | | | |
( SkyBoxSize, -0.5*SkyBoxSize, SkyBoxSize), // | 10-----|--11
(-SkyBoxSize, -0.5*SkyBoxSize, -SkyBoxSize), // | / | /
( SkyBoxSize, -0.5*SkyBoxSize, -SkyBoxSize)); // |/ |/
// 8---------9
//index voor 6 zijden met elk 4 punten (quad)
IndexArray: array[0..39] of byte = (0,4,7,3, //links
8,10,4,0,
5,1,2,6, //rechts
11,9,1,5,
// 4,0,1,5, //onder
10,8,9,11,
6,2,3,7, //boven
1,0,3,2, //achter
9,8,0,1,
4,5,6,7, //voor
10,11,5,4);
NormalArray: array[0..9,0..2] of single = ((1,0,0), //links
(1,0,0),
(-1,0,0), //rechts
(-1,0,0),
(0,1,0), //onder
(0,-1,0), //boven
(0,0,1), //achter
(0,0,1),
(0,0,-1), //voor
(0,0,-1));
FogCoordArray: array[0..11] of single = (1.0, //
1.0,
0.0,
0.0,
1.0, //
1.0,
0.0,
0.0,
1.0, //
1.0,
1.0,
1.0);
TexCoordArray: array[0..39,0..1] of single = ((0,0.5), //links 0,4,7,3
{ 7---------6 } (1,0.5),
{ /| /| y } (1,1),
{ / | / | | } (0,1),
{ 3---------2 | |___x } (0,0), // 8,10,4,0
{ | | | | / } (1,0),
{ | 4------|--5 z } (1,0.5),
{ | /| | /| } (0,0.5),
{ |/ | |/ | } (0,0.5), //rechts 5,1,2,6
{ 0---------1 | } (1,0.5),
{ | | | | } (1,1),
{ | 10-----|--11 } (0,1),
{ | / | / } (0,0), // 11,9,1,5
{ |/ |/ } (1,0),
{ 8---------9 } (1,0.5),
{ } (0,0.5),
(0,0), //onder 10,8,9,11
(1,0),
(1,1),
(0,1),
(0,0), //boven 6,2,3,7
(1,0),
(1,1),
(0,1),
(0,0.5), //achter 1,0,3,2
(1,0.5),
(1,1),
(0,1),
(0,0), // 9,8,0,1
(1,0),
(1,0.5),
(0,0.5),
(0,0.5), //voor 4,5,6,7
(1,0.5),
(1,1),
(0,1),
(0,0), // 10,11,5,4
(1,0),
(1,0.5),
(0,0.5));
var i,j, Index: integer;
TexHandle: GLuint;
begin
(*
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, @VertexArray[0]);
glEnableClientState(GL_NORMAL_ARRAY);
glNormalPointer(GL_FLOAT, 0, @NormalArray[0,0]);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, @TexCoordArray[0,0]);
*)
DisplayList := glGenLists(1);
if DisplayList <> 0 then begin
glNewList(DisplayList, GL_COMPILE);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
//glDisable(GL_DEPTH_TEST);
{glDepthRange(0.0, 12.0);}
{glDepthMask(GL_FALSE);}
glFrontFace(GL_CCW);
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);
glPolygonMode(GL_FRONT, GL_FILL);
//! glDisable(GL_FOG); // gaat niet in een displaylist
glDisable(GL_LIGHTING); // belichting tijdelijk uitschakelen
glDisable(GL_BLEND); // blending uit
glEnable(GL_TEXTURE_2D); // texturing inschakelen
//
glColor3f(1.0,1.0,1.0);
for i:=planeLeftT to planeFarB do begin
// Eerst een texture binden
TexHandle := TextureHandleForPlane(i);
glBindTexture(GL_TEXTURE_2D, TexHandle);
// geen texture aanwezig??
if TexHandle = 0 then begin
// teken een face met kleur(RGB)
glBegin(GL_QUADS);
for j:=0 to 3 do begin
Index := IndexArray[i*4+j];
glVertex3fv( @VertexArray[Index] );
end;
glEnd;
end else begin
// dan de texture instellingen
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
//belangrijk te "plakken" aan de randen, anders naadjes.
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); // OpenGL 1.2
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// teken een face met kleur(RGB) & texture(TexHandle)
glBegin(GL_QUADS);
glNormal3f(NormalArray[i,0], NormalArray[i,1], NormalArray[i,2]);
for j:=0 to 3 do begin
Index := IndexArray[i*4+j];
(*
if FogCoordArray[Index]=1.0 then glColor4f(1,1,1,1)
else glColor4f(0,0,0,0);
*)
glTexCoord2f(TexCoordArray[i*4+j,0], TexCoordArray[i*4+j,1]);
glVertex3fv( @VertexArray[Index] );
end;
glEnd;
(*
glDrawArrays(GL_QUADS, IndexArray[i*4], 4);
glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, @IndexArray[i*4]);
*)
end;
end;
//
glEndList;
(*
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
*)
{glDepthFunc(GL_LESS);}
{glDepthRange(0.0, 1.0);}
{glDepthMask(GL_TRUE);}
//! if POGL(OGL)^.Fog then glEnable(GL_FOG); // gaat niet in een displaylist
end;
end;
procedure TSkyBox.DeleteDisplayList;
begin
if DisplayList <> 0 then
if glIsList(DisplayList) then
glDeleteLists(DisplayList, 1);
DisplayList := 0;
end;
(*
initialization
SkyBox := TSkyBox.Create;
finalization
SkyBox.Free;
*)
end.