src/engine/e_textures.pas

   1 (* Copyright (C)  DooM 2D:Forever Developers
   2  *
   3  * This program is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 3 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *)
  16 {$INCLUDE ../shared/a_modes.inc}
  17 unit e_textures;
  18
  19 { This unit provides interface to load 24-bit and 32-bit uncompressed images
  20   from Truevision Targa (TGA) graphic files, and create OpenGL textures
  21   from it's data. }
  22
  23 interface
  24
  25 uses
  26   GL, GLExt, SysUtils, e_log,
  27   ImagingTypes, Imaging, ImagingUtility;
  28
  29 type
  30   GLTexture = record
  31     id: GLuint;
  32     width, height: Word; // real
  33     glwidth, glheight: Word; // powerof2
  34     u, v: Single; // usually 1.0
  35     fmt: GLuint;
  36   end;
  37
  38 var
  39   e_DummyTextures: Boolean = False;
  40   e_glLegacyNPOT: Boolean = False;
  41   TEXTUREFILTER: Integer = GL_NEAREST;
  42
  43 function CreateTexture (var tex: GLTexture; Width, Height, aFormat: Word; pData: Pointer): Boolean;
  44
  45 // Standard set of images loading functions
  46 function LoadTexture (Filename: String; var Texture: GLTexture; var pWidth, pHeight: Word; Fmt: PWord=nil): Boolean;
  47 function LoadTextureEx (Filename: String; var Texture: GLTexture; fX, fY, fWidth, fHeight: Word; Fmt: PWord=nil): Boolean;
  48 function LoadTextureMem (pData: Pointer; dataSize: LongInt; var Texture: GLTexture; var pWidth, pHeight: Word; Fmt: PWord=nil): Boolean;
  49 function LoadTextureMemEx (pData: Pointer; dataSize: LongInt; var Texture: GLTexture; fX, fY, fWidth, fHeight: Word; Fmt: PWord=nil): Boolean;
  50
  51 // `img` must be valid!
  52 function LoadTextureImg (var img: TImageData; var Texture: GLTexture; var pWidth, pHeight: Word; Fmt: PWord=nil): Boolean;
  53
  54
  55 implementation
  56
  57 uses
  58   Classes, BinEditor, utils;
  59
  60
  61 function AlignP2 (n: Word): Word;
  62 begin
  63   Dec(n);
  64   n := n or (n shr 1);
  65   n := n or (n shr 2);
  66   n := n or (n shr 4);
  67   n := n or (n shr 8);
  68   n := n or (n shr 16);
  69   Inc(n);
  70   Result := n;
  71 end;
  72
  73
  74 // This is auxiliary function that creates OpenGL texture from raw image data
  75 function CreateTexture (var tex: GLTexture; Width, Height, aFormat: Word; pData: Pointer): Boolean;
  76 var
  77   Texture: GLuint;
  78   fmt: GLenum;
  79 begin
  80   tex.width := Width;
  81   tex.height := Height;
  82   tex.glwidth := Width;
  83   tex.glheight := Height;
  84   tex.u := 1;
  85   tex.v := 1;
  86
  87   if e_glLegacyNPOT then
  88   begin
  89     tex.glwidth := AlignP2(Width);
  90     tex.glheight := AlignP2(Height);
  91     if tex.glwidth <> tex.width then tex.u := (tex.width+0.0)/(tex.glwidth+0.0);
  92     if tex.glheight <> tex.height then tex.v := (tex.height+0.0)/(tex.glheight+0.0);
  93   end;
  94
  95   //if (tex.glwidth <> tex.width) or (tex.glheight <> tex.height) then
  96   //  e_WriteLog(Format('NPOT: orig is %ux%u; gl is %ux%u; u=%f; v=%f', [Width, Height, tex.glwidth, tex.glheight, tex.u, tex.v]), MSG_NOTIFY);
  97
  98   if e_DummyTextures then
  99   begin
 100     tex.id := GLuint(-1);
 101     Result := True;
 102     Exit;
 103   end;
 104
 105   glGenTextures(1, @Texture);
 106   tex.id := Texture;
 107   glBindTexture(GL_TEXTURE_2D, Texture);
 108
 109   if (tex.glwidth <> tex.width) or (tex.glheight <> tex.height) then
 110     e_WriteLog(Format('NPOT: %u is %ux%u; gl is %ux%u; u=%f; v=%f', [tex.id, Width, Height, tex.glwidth, tex.glheight, tex.u, tex.v]), MSG_NOTIFY);
 111
 112   // texture blends with object background
 113   glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 114   // texture does NOT blend with object background
 115   //glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
 116
 117   {
 118     Select a filtering type.
 119     BiLinear filtering produces very good results with little performance impact
 120
 121     GL_NEAREST               - Basic texture (grainy looking texture)
 122     GL_LINEAR                - BiLinear filtering
 123     GL_LINEAR_MIPMAP_NEAREST - Basic mipmapped texture
 124     GL_LINEAR_MIPMAP_LINEAR  - BiLinear Mipmapped texture
 125   }
 126
 127   // for GL_TEXTURE_MAG_FILTER only first two can be used
 128   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, TEXTUREFILTER);
 129   // for GL_TEXTURE_MIN_FILTER all of the above can be used
 130   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, TEXTUREFILTER);
 131
 132   // create empty texture
 133   if aFormat = GL_RGBA then fmt := GL_RGBA else fmt := GL_RGB; // silly, yeah?
 134   glTexImage2D(GL_TEXTURE_2D, 0, fmt, tex.glwidth, tex.glheight, 0, GL_RGBA, GL_UNSIGNED_BYTE, nil);
 135
 136   (*
 137   GetMem(buf, tex.glwidth*4*tex.glheight);
 138   try
 139     FillChar(buf^, tex.glwidth*4*tex.glheight, 255);
 140     glTexSubImage2D(GL_TEXTURE_2D, 0,  0, 0, tex.glwidth, tex.glheight, fmt, GL_UNSIGNED_BYTE, buf);
 141     if (tex.glheight = 128) and (tex.height = 80) then
 142     begin
 143       for f := 0 to tex.glheight-1 do
 144       begin
 145         for c := 0 to tex.glwidth-1 do
 146         begin
 147           buf[f*(tex.glwidth*4)+c*4+0] := 255;
 148           buf[f*(tex.glwidth*4)+c*4+1] := 127;
 149           buf[f*(tex.glwidth*4)+c*4+2] := 0;
 150         end;
 151       end;
 152       glTexSubImage2D(GL_TEXTURE_2D, 0,  0, 82, tex.glwidth, {tex.glheight}1, fmt, GL_UNSIGNED_BYTE, buf);
 153     end;
 154   finally
 155     FreeMem(buf);
 156   end;
 157   *)
 158
 159   glTexSubImage2D(GL_TEXTURE_2D, 0,  0, 0, Width, Height, fmt, GL_UNSIGNED_BYTE, pData);
 160   //glTexSubImage2D(GL_TEXTURE_2D, 0,  0, tex.glheight-tex.height, Width, Height, fmt, GL_UNSIGNED_BYTE, pData);
 161
 162   glBindTexture(GL_TEXTURE_2D, 0);
 163
 164   Result := true;
 165 end;
 166
 167 // `img` must be valid!
 168 function LoadTextureImg (var img: TImageData; var Texture: GLTexture; var pWidth, pHeight: Word; Fmt: PWord=nil): Boolean;
 169 var
 170   image, ii: PByte;
 171   width, height: Integer;
 172   imageSize: Integer;
 173   x, y: Integer;
 174   clr: TColor32Rec;
 175 begin
 176   result := false;
 177   pWidth := 0;
 178   pHeight := 0;
 179   if Fmt <> nil then Fmt^ := GL_RGBA; // anyway
 180
 181   if (img.width < 1) or (img.width > 32768) or (img.height < 1) or (img.height > 32768) then
 182   begin
 183     e_WriteLog('Error loading texture: invalid image dimensions', MSG_WARNING);
 184     exit;
 185   end;
 186   //ConvertImage(img, ifA8R8G8B8);
 187   width := img.width;
 188   height := img.height;
 189   pWidth := width;
 190   pHeight := height;
 191   imageSize := Width*Height*4;
 192   GetMem(image, imageSize);
 193   try
 194     // it's slow, but i don't care for now
 195     ii := image;
 196     for y := height-1 downto 0 do
 197     begin
 198       for x := 0 to width-1 do
 199       begin
 200         clr := GetPixel32(img, x, y);
 201         ii^ := clr.r; Inc(ii);
 202         ii^ := clr.g; Inc(ii);
 203         ii^ := clr.b; Inc(ii);
 204         ii^ := clr.a; Inc(ii);
 205       end;
 206     end;
 207     CreateTexture(Texture, width, height, GL_RGBA, image);
 208     result := true;
 209   finally
 210     FreeMem(image);
 211   end;
 212 end;
 213
 214
 215 function LoadTextureMem (pData: Pointer; dataSize: LongInt; var Texture: GLTexture; var pWidth, pHeight: Word; Fmt: PWord=nil): Boolean;
 216 var
 217   img: TImageData;
 218 begin
 219   result := false;
 220   pWidth := 0;
 221   pHeight := 0;
 222   if Fmt <> nil then Fmt^ := GL_RGBA; // anyway
 223
 224   InitImage(img);
 225   if not LoadImageFromMemory(pData, dataSize, img) then
 226   begin
 227     e_WriteLog('Error loading texture: unknown image format', MSG_WARNING);
 228     exit;
 229   end;
 230   try
 231     result := LoadTextureImg(img, Texture, pWidth, pHeight, Fmt);
 232   finally
 233     FreeImage(img);
 234   end;
 235 end;
 236
 237
 238 function LoadTextureMemEx (pData: Pointer; dataSize: LongInt; var Texture: GLTexture; fX, fY, fWidth, fHeight: Word; Fmt: PWord=nil): Boolean;
 239 var
 240   image, ii: PByte;
 241   imageSize: Integer;
 242   img: TImageData;
 243   x, y: Integer;
 244   clr: TColor32Rec;
 245 begin
 246   result := false;
 247   if Fmt <> nil then Fmt^ := GL_RGBA; // anyway
 248
 249   InitImage(img);
 250   if not LoadImageFromMemory(pData, dataSize, img) then
 251   begin
 252     e_WriteLog('Error loading texture: unknown image format', MSG_WARNING);
 253     exit;
 254   end;
 255   try
 256     if (img.width < 1) or (img.width > 32768) or (img.height < 1) or (img.height > 32768) then
 257     begin
 258       e_WriteLog('Error loading texture: invalid image dimensions', MSG_WARNING);
 259       exit;
 260     end;
 261     //ConvertImage(img, ifA8R8G8B8);
 262     if fX > img.width then exit;
 263     if fY > img.height then exit;
 264     if fX+fWidth > img.width then exit;
 265     if fY+fHeight > img.height then exit;
 266     //writeln('fX=', fX, '; fY=', fY, '; fWidth=', fWidth, '; fHeight=', fHeight);
 267     imageSize := img.width*img.height*4;
 268     GetMem(image, imageSize);
 269     try
 270       // it's slow, but i don't care for now
 271       ii := image;
 272       for y := fY+fHeight-1 downto fY do
 273       begin
 274         for x := fX to fX+fWidth-1 do
 275         begin
 276           clr := GetPixel32(img, x, y);
 277           ii^ := clr.r; Inc(ii);
 278           ii^ := clr.g; Inc(ii);
 279           ii^ := clr.b; Inc(ii);
 280           ii^ := clr.a; Inc(ii);
 281         end;
 282       end;
 283       CreateTexture(Texture, fWidth, fHeight, GL_RGBA, image);
 284       result := true;
 285     finally
 286       FreeMem(image);
 287     end;
 288   finally
 289     FreeImage(img);
 290   end;
 291 end;
 292
 293
 294 function LoadTexture (filename: AnsiString; var Texture: GLTexture; var pWidth, pHeight: Word; Fmt: PWord=nil): Boolean;
 295 var
 296   fs: TStream;
 297   img: Pointer;
 298   imageSize: LongInt;
 299 begin
 300   result := False;
 301   pWidth := 0;
 302   pHeight := 0;
 303   if Fmt <> nil then Fmt^ := GL_RGBA; // anyway
 304   fs := nil;
 305
 306   try
 307     fs := openDiskFileRO(filename);
 308   except
 309     fs := nil;
 310   end;
 311   if fs = nil then
 312   begin
 313     e_WriteLog('Texture "'+filename+'" not found', MSG_WARNING);
 314     exit;
 315   end;
 316
 317   try
 318     imageSize := fs.size;
 319     GetMem(img, imageSize);
 320     try
 321       fs.readBuffer(img^, imageSize);
 322       result := LoadTextureMem(img, imageSize, Texture, pWidth, pHeight, Fmt);
 323     finally
 324       FreeMem(img);
 325     end;
 326   finally
 327     fs.Free();
 328   end;
 329 end;
 330
 331
 332 function LoadTextureEx (filename: AnsiString; var Texture: GLTexture; fX, fY, fWidth, fHeight: Word; Fmt: PWord=nil): Boolean;
 333 var
 334   fs: TStream;
 335   img: Pointer;
 336   imageSize: LongInt;
 337 begin
 338   result := False;
 339   if Fmt <> nil then Fmt^ := GL_RGBA; // anyway
 340   fs := nil;
 341
 342   try
 343     fs := openDiskFileRO(filename);
 344   except
 345     fs := nil;
 346   end;
 347   if fs = nil then
 348   begin
 349     e_WriteLog('Texture "'+filename+'" not found', MSG_WARNING);
 350     exit;
 351   end;
 352
 353   try
 354     imageSize := fs.size;
 355     GetMem(img, imageSize);
 356     try
 357       fs.readBuffer(img^, imageSize);
 358       result := LoadTextureMemEx(img, imageSize, Texture, fX, fY, fWidth, fHeight, Fmt);
 359     finally
 360       FreeMem(img);
 361     end;
 362   finally
 363     fs.Free();
 364   end;
 365 end;
 366
 367 end.