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| {$DEFINE BILINEAR} unit Textures;
interface
uses Windows, Types, OpenGL, ActiveX;
const IID_IPicture : TGUID = '{7BF80980-BF32-101A-8BBB-00AA00300CAB}';
function LoadTexture(filename: string): Cardinal;
implementation
function gluBuild2DMipmaps(Target: GLenum; Components, Width, Height: GLint; Format, atype: GLenum; Data: Pointer): GLint; stdcall; external glu32; procedure glGenTextures(n: GLsizei; var textures: GLuint); stdcall; external opengl32; procedure glBindTexture(target: GLenum; texture: GLuint); stdcall; external opengl32;
procedure SwapRGB(data : Pointer; Size : Integer); asm mov ebx, eax mov ecx, size @@loop: mov al, [ebx+0] mov ah, [ebx+2] mov [ebx+2], al mov [ebx+0], ah add ebx, 3 dec ecx jnz @@loop end;
function FileExists(fn: string): boolean; var fd: TWIN32FindData; fh: THandle; begin fh := FindFirstFile(pchar(fn), fd); result := fh <> INVALID_HANDLE_VALUE; FindClose(fh); end;
function CreateTexture(Width, Height, Format: Word; pData: Pointer) : GluInt; begin glGenTextures(1, Result); glBindTexture(GL_TEXTURE_2D, Result); glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, {$IFDEF BILINEAR}GL_LINEAR{$ELSE}GL_NEAREST{$ENDIF}); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, {$IFDEF BILINEAR}GL_LINEAR_MIPMAP_LINEAR{$ELSE}GL_NEAREST{$ENDIF}); if Format = GL_RGBA then gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, pData) else gluBuild2DMipmaps(GL_TEXTURE_2D, 3, Width, Height, GL_RGB, GL_UNSIGNED_BYTE, pData); end;
procedure InitializeBitmapInfoHeader(Bitmap: HBITMAP; var BI: TBitmapInfoHeader); var bmp: Windows.TBitmap; begin GetObject(Bitmap, SizeOf(bmp), @bmp); FillChar(BI, sizeof(TBitmapInfoHeader), #0); with BI do begin biSize := SizeOf(BI); biWidth := bmp.bmWidth; biHeight := bmp.bmHeight; biPlanes := 1; biCompression := BI_RGB; biBitCount := 24; biSizeImage := (((biWidth * biBitCount) + 31) div 32) * 4 * biHeight; end; end;
function LoadPicture(Filename: string; var pPicture: IPicture):Boolean; var hFile, hMem: DWORD; dwFileSize,dwBytesRead: DWORD; pData: pointer; bRead: boolean; hRes: HRESULT; pStream: IStream; begin Result := false; hFile := CreateFile(PChar(Filename), GENERIC_READ, 0 ,nil, OPEN_EXISTING, 0, 0); if (hFile <> INVALID_HANDLE_VALUE) then try dwFileSize := GetFileSize(hFile, nil); if (dwFileSize < INVALID_FILE_SIZE) then begin hMem := GlobalAlloc(GMEM_MOVEABLE or GMEM_NODISCARD, dwFileSize); if hMem > 0 then try pData := GlobalLock(hMem); if pData <> nil then begin bRead:=ReadFile(hFile, pData^ , dwFileSize, dwBytesRead, nil); if bRead then begin pStream := nil; hRes := CreateStreamOnHGlobal(hMem, true, pStream); if not FAILED(hRes) and (pStream <> nil) then begin hRes := OleLoadPicture(pStream, dwFileSize, false, IID_IPicture, pPicture); Result := (hRes=S_OK) and (pPicture <> nil); end; end; end; finally GlobalUnlock(hMem); end; end; finally CloseHandle(hFile); end; pStream := nil; end;
function LoadSTDTexture(filename: string): GLUint; var hDC: windows.HDC; pPicture: IPicture; hmWidth,hmHeight: longint; nWidth, nHeight: integer; rc: TRect; data: pointer;
bmp: HBITMAP; info: TBitmapInfo; begin result := 0; try hDC := CreateCompatibleDC(0); if LoadPicture(filename, pPicture) then begin pPicture.get_Width(hmWidth); pPicture.get_Height(hmHeight); nWidth := MulDiv(hmWidth, GetDeviceCaps(hDC, LOGPIXELSX), 2540); nHeight := MulDiv(hmHeight, GetDeviceCaps(hDC, LOGPIXELSY), 2540); rc := rect(0,0,nWidth,nHeight); bmp := CreateBitmap(nWidth,nHeight,1,GetDeviceCaps(hDC, BITSPIXEL),nil); if bmp <> 0 then try SelectObject(hDC, bmp); pPicture.Render(hDC, 0, 0, nWidth, nHeight, 0, hmHeight, hmWidth, -hmHeight, rc); InitializeBitmapInfoHeader(bmp, info.bmiHeader); getmem(data, info.bmiHeader.biSizeImage); try if GetDIBits(hDC, bmp, 0, info.bmiHeader.biHeight, data, Info, DIB_RGB_COLORS)=0 then exit; SwapRGB(data, info.bmiHeader.biWidth * info.bmiHeader.biHeight); result := CreateTexture(nWidth, nHeight, GL_RGB, data) finally freemem(data); end; finally DeleteObject(bmp); end; end; finally pPicture := nil; end; end;
function LoadTGATexture(Filename: String): GLUInt; var TGAHeader : packed record FileType : Byte; ColorMapType : Byte; ImageType : Byte; ColorMapSpec : array[0..4] of Byte; OrigX : array[0..1] of Byte; OrigY : array[0..1] of Byte; Width : array[0..1] of Byte; Height : array[0..1] of Byte; BPP : Byte; imageinfo : Byte; end; TGAFile: file; bytesRead: integer; image, CompImage: pointer; Width, Height: integer; ImageSize: integer; BufferIndex: integer; CurrentByte, CurrentPixel: integer; i: integer; Front, Back: ^Byte; Temp: byte;
procedure CopySwapPixel(const Source, Destination : Pointer); asm push ebx mov bl,[eax+0] mov bh,[eax+1] mov [edx+2],bl mov [edx+1],bh mov bl,[eax+2] mov bh,[eax+3] mov [edx+0],bl mov [edx+3],bh pop ebx end;
begin result := 0; if FileExists(Filename) then begin AssignFile(TGAFile, Filename); Reset(TGAFile, 1); BlockRead(TGAFile, TGAHeader, SizeOf(TGAHeader)); end else begin MessageBox(0, PChar('File not found - ' + Filename), PChar('TGA Texture'), MB_OK); exit; end;
if (not TGAHeader.ImageType in [2, 10]) or (TGAHeader.ColorMapType <> 0) or (not TGAHeader.BPP in [24,32]) then begin CloseFile(tgaFile); MessageBox(0, PChar('Couldn''t load "'+ Filename +'". Only 24 and 32 bit TGA files supported.'), PChar('TGA File Error'), MB_OK); exit; end;
Width := TGAHeader.Width[0] + TGAHeader.Width[1] shl 8; Height := TGAHeader.Height[0] + TGAHeader.Height[1] shl 8; TGAHeader.BPP := TGAHeader.BPP div 8; ImageSize := Width*Height*(TGAHeader.BPP);
GetMem(Image, ImageSize); try case TGAHeader.ImageType of 2: begin BlockRead(TGAFile, image^, ImageSize, bytesRead); if bytesRead <> ImageSize then begin CloseFile(TGAFile); MessageBox(0, PChar('Couldn''t read file "'+ Filename +'".'), PChar('TGA File Error'), MB_OK); exit; end; Front := pointer(integer(image)-TGAHeader.BPP); Back := pointer(integer(image)-TGAHeader.BPP+2); for i := 0 to Width*Height-1 do begin inc(Front, TGAHeader.BPP); inc(Back, TGAHeader.BPP); Temp := Front^; Front^ := Back^; Back^ := Temp; end; Result := CreateTexture(Width, Height, GL_RGBA - byte(TGAHeader.BPP=3), Image); end; 10: begin CurrentByte := 0; CurrentPixel := 0; BufferIndex := 0; GetMem(CompImage, FileSize(TGAFile)-sizeOf(TGAHeader)); try BlockRead(TGAFile, CompImage^, FileSize(TGAFile)-sizeOf(TGAHeader), BytesRead); if bytesRead <> FileSize(TGAFile)-sizeOf(TGAHeader) then begin CloseFile(TGAFile); MessageBox(0, PChar('Couldn''t read file "'+ Filename +'".'), PChar('TGA File Error'), MB_OK); exit; end; repeat Front := Pointer(integer(CompImage) + BufferIndex); inc(BufferIndex); case Front^ of 0..127: begin for i := 0 to Front^ do begin CopySwapPixel(Pointer(integer(CompImage)+BufferIndex+i*TGAHeader.BPP), Pointer(integer(image)+CurrentByte)); inc(CurrentByte, TGAHeader.BPP); inc(CurrentPixel); end; inc(BufferIndex, (Front^+1)*TGAHeader.BPP); end else begin for I := 0 to Front^-128 do begin CopySwapPixel(Pointer(Integer(CompImage)+BufferIndex), Pointer(Integer(image)+CurrentByte)); inc(CurrentByte, TGAHeader.BPP); inc(CurrentPixel); end; inc(BufferIndex, TGAHeader.BPP); end; end; until CurrentPixel >= Width*Height; Result := CreateTexture(Width, Height, GL_RGBA - byte(TGAHeader.BPP = 3), Image); finally freemem(CompImage); end; end; end; finally FreeMem(Image); end; end;
function LoadTexture(Filename: string): GLUint; begin if copy(AnsiUpper(pchar(filename)), length(filename)-3, 4) = '.TGA' then result := LoadTGATexture(Filename) else result := LoadSTDTexture(filename); end;
end. |