src/nogl/noGLES1.inc

   1 implementation
   2
   3   uses SDL2;
   4
   5   const
   6     GL_FLOAT = $1406;
   7     GL_VERTEX_ARRAY = $8074;
   8     GL_NORMAL_ARRAY = $8075;
   9     GL_COLOR_ARRAY = $8076;
  10     GL_TEXTURE_COORD_ARRAY = $8078;
  11     GL_TRIANGLES = $0004;
  12     GL_TEXTURE0 = $84C0;
  13     GL_INVALID_ENUM = $0500;
  14
  15   const
  16     ValPerVertex = 2;
  17     ValPerColor = 4;
  18     ValPerCoord = 2;
  19
  20   type
  21     TArrayFloat = array of GLfloat;
  22
  23     TCmds = record
  24       mode: GLenum;
  25       v, c, t: TArrayFloat;
  26     end;
  27
  28   var
  29     cmds: TCmds;
  30
  31   var
  32     extList: string = '';
  33
  34   var
  35     es_glVertexPointer: procedure (size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); cdecl;
  36     es_glColorPointer: procedure (size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); cdecl;
  37     es_glTexCoordPointer: procedure (size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); cdecl;
  38     es_glEnableClientState: procedure (arr: GLenum); cdecl;
  39     es_glDisableClientState: procedure (arr: GLenum); cdecl;
  40     es_glDrawArrays: procedure (mode: GLenum; first: GLint; count: GLsizei); cdecl;
  41 //    es_glActiveTexture: procedure(texture: GLenum); cdecl;
  42 //    es_glClientActiveTexture: procedure(texture: GLenum); cdecl;
  43     es_glColor4f: procedure(red, green, blue, alpha: GLfloat); cdecl;
  44
  45     es_glEnable: procedure (cap: GLenum); cdecl;
  46     es_glDisable: procedure (cap: GLenum); cdecl;
  47     es_glIsEnabled: function (cap: GLenum): GLBoolean; cdecl;
  48     es_glGetString: function (name: GLenum): PChar; cdecl;
  49     es_glGetError: function (): GLenum; cdecl;
  50     es_glClearColor: procedure (red, green, blue, alpha: GLclampf); cdecl;
  51     es_glClear: procedure (mask: GLbitfield); cdecl;
  52     es_glAlphaFunc: procedure (func: GLenum; ref: GLclampf); cdecl;
  53     es_glBlendFunc: procedure (sfactor, dfactor: GLenum); cdecl;
  54     es_glPointSize: procedure (size: GLfloat); cdecl;
  55     es_glLineWidth: procedure (width: GLfloat); cdecl;
  56     es_glGetIntegerv: procedure (pname: GLenum; params: PGLint); cdecl;
  57     es_glFlush: procedure; cdecl;
  58     es_glFinish: procedure; cdecl;
  59
  60     es_glMultMatrixf: procedure (m: PGLfloat); cdecl;
  61     //es_glOrthof: procedure (left, right, bottom, top, near, far: GLfloat); cdecl;
  62     es_glLoadIdentity: procedure; cdecl;
  63     es_glMatrixMode: procedure (mode: GLenum); cdecl;
  64     es_glLoadMatrixf: procedure (m: PGLfloat); cdecl;
  65     es_glPushMatrix: procedure; cdecl;
  66     es_glPopMatrix: procedure; cdecl;
  67     es_glTranslatef: procedure (x, y, z: GLfloat); cdecl;
  68     es_glRotatef: procedure (angle, x, y, z: GLfloat); cdecl;
  69     es_glScalef: procedure (x, y, z: GLfloat); cdecl;
  70
  71     es_glReadPixels: procedure (x, y: GLint; width, height: GLsizei; format,_type: GLenum; pixels: PGLvoid); cdecl;
  72
  73     es_glViewport: procedure (x, y: GLint; width, height: GLsizei); cdecl;
  74     es_glScissor: procedure (x, y: GLint; width, height: GLsizei); cdecl;
  75     es_glStencilMask: procedure (mask: GLuint); cdecl;
  76     es_glStencilFunc: procedure (func: GLenum; ref: GLint; mask: GLuint); cdecl;
  77     es_glStencilOp: procedure (fail, zfail, zpass: GLenum); cdecl;
  78     es_glColorMask: procedure (red: GLboolean; green: GLboolean; blue: GLboolean; alpha: GLboolean); cdecl;
  79
  80     es_glBindTexture: procedure (target: GLenum; texture: GLuint); cdecl;
  81     es_glGenTextures: procedure (n: GLsizei; textures: PGLuint); cdecl;
  82     es_glTexEnvi: procedure (target: GLenum; pname: GLenum; param: GLint); cdecl;
  83     es_glTexParameterf: procedure (target: GLenum; pname: GLenum; param: GLfloat); cdecl;
  84     es_glTexParameteri: procedure (target: GLenum; pname: GLenum; param: GLint); cdecl;
  85     es_glTexImage2D: procedure (target: GLenum; level, internalformat: GLint; width, height: GLsizei; border: GLint; format, _type:GLenum; pixels: PGLvoid); cdecl;
  86     es_glTexSubImage2D: procedure (target: GLenum; level: GLint; xoffset, yoffset: GLint; width, height: GLsizei; format, _type: GLenum; pixels: PGLvoid); cdecl;
  87     es_glDeleteTextures: procedure (n: GLsizei; textures: PGLuint); cdecl;
  88
  89     es_glGenFramebuffers: procedure (n: GLsizei; framebuffers: PGLuint); cdecl;
  90     es_glBindFramebuffer: procedure (target: GLenum; framebuffer: GLuint); cdecl;
  91     es_glFramebufferTexture2D: procedure (target, attachment, textarget: GLenum; texture: GLuint; level: GLint); cdecl;
  92     es_glFramebufferRenderbuffer: procedure (target, attachment, rbotarget: GLenum; rbo: GLuint); cdecl;
  93     es_glCheckFramebufferStatus: function (framebuffer: GLuint): GLenum; cdecl;
  94     es_glDeleteFramebuffers: procedure (n: GLsizei; const framebuffers: PGLuint); cdecl;
  95
  96     es_glGenRenderbuffers: procedure (n: GLsizei; framebuffers: PGLuint); cdecl;
  97     es_glBindRenderbuffer: procedure (target: GLenum; renderbuffer: GLuint); cdecl;
  98     es_glRenderbufferStorage: procedure (target, internalformat: GLenum; w, h: GLsizei); cdecl;
  99     es_glDeleteRenderbuffers: procedure (n: GLsizei; const renderbuffers: PGLuint); cdecl;
 100
 101   procedure glEnable(cap: GLenum);
 102   begin
 103     es_glEnable(cap);
 104   end;
 105
 106   procedure glDisable(cap: GLenum);
 107   begin
 108     es_glDisable(cap);
 109   end;
 110
 111   function glIsEnabled(cap: GLenum): GLboolean;
 112   begin
 113     result := es_glIsEnabled(cap);
 114   end;
 115
 116   function glGetString(name: GLenum): PChar;
 117   begin
 118     result := es_glGetString(name);
 119   end;
 120
 121   function glGetError: GLenum;
 122   begin
 123     result := es_glGetError
 124   end;
 125
 126   procedure glClearColor(red, green, blue, alpha: GLclampf);
 127   begin
 128     es_glClearColor(red, green, blue, alpha);
 129   end;
 130
 131   procedure glClear(mask: GLbitfield);
 132   begin
 133     es_glClear(mask);
 134   end;
 135
 136   procedure glAlphaFunc(func: GLenum; ref: GLclampf);
 137   begin
 138     es_glAlphaFunc(func, ref);
 139   end;
 140
 141   procedure glBlendFunc(sfactor, dfactor: GLenum);
 142   begin
 143     es_glBlendFunc(sfactor, dfactor);
 144   end;
 145
 146   procedure glPointSize(size: GLfloat);
 147   begin
 148     es_glPointSize(size);
 149   end;
 150
 151   procedure glLineWidth(width: GLfloat);
 152   begin
 153     es_glLineWidth(width);
 154   end;
 155
 156   procedure glGetIntegerv(pname: GLenum; params: PGLint);
 157   begin
 158     es_glGetIntegerv(pname, params);
 159   end;
 160
 161   procedure glFlush;
 162   begin
 163     es_glFlush;
 164   end;
 165
 166   procedure glFinish;
 167   begin
 168     es_glFinish;
 169   end;
 170
 171
 172
 173
 174
 175   procedure glBegin(mode: GLenum);
 176   begin
 177     assert(cmds.mode = GL_INVALID_ENUM);
 178     assert((mode = GL_POINTS) or (mode = GL_LINES) or (mode = GL_QUADS) or (mode = GL_LINE_LOOP));
 179     cmds.mode := mode;
 180     SetLength(cmds.v, 0);
 181     SetLength(cmds.c, 0);
 182     SetLength(cmds.t, 0);
 183   end;
 184
 185   procedure glEnd;
 186   begin
 187     assert(cmds.mode <> GL_INVALID_ENUM);
 188     assert(Length(cmds.v) mod ValPerVertex = 0);
 189     assert(Length(cmds.c) mod ValPerColor = 0);
 190     assert(Length(cmds.t) mod ValPerCoord = 0);
 191     if Length(cmds.c) <> 0 then
 192       assert(Length(cmds.v) div ValPerVertex = Length(cmds.c) div ValPerColor);
 193     if Length(cmds.t) <> 0 then
 194       assert(Length(cmds.v) div ValPerVertex = Length(cmds.t) div ValPerCoord);
 195
 196     es_glVertexPointer(ValPerVertex, GL_FLOAT, 0, @cmds.v[0]);
 197     es_glColorPointer(ValPerColor, GL_FLOAT, 0, @cmds.c[0]);
 198     es_glTexCoordPointer(ValPerCoord, GL_FLOAT, 0, @cmds.t[0]);
 199     es_glEnableClientState(GL_VERTEX_ARRAY);
 200     es_glEnableClientState(GL_COLOR_ARRAY);
 201     es_glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 202     es_glDisableClientState(GL_NORMAL_ARRAY);
 203
 204     if Length(cmds.c) = 0 then
 205       es_glDisableClientState(GL_COLOR_ARRAY);
 206     if Length(cmds.t) = 0 then
 207       es_glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 208
 209     if cmds.mode = GL_QUADS then
 210       es_glDrawArrays(GL_TRIANGLES, 0, Length(cmds.v) div ValPerVertex)
 211     else
 212       es_glDrawArrays(cmds.mode, 0, Length(cmds.v) div ValPerVertex);
 213
 214     SetLength(cmds.v, 0);
 215     SetLength(cmds.c, 0);
 216     SetLength(cmds.t, 0);
 217     cmds.mode := GL_INVALID_ENUM;
 218   end;
 219
 220 (* ---------- begin internals ---------- *)
 221
 222   procedure AddFloatRaw (var x: TArrayFloat; f: GLfloat);
 223     var i: Integer;
 224   begin
 225     i := Length(x);
 226     SetLength(x, i + 1);
 227     x[i] := f;
 228   end;
 229
 230   procedure AddFloatX (var x: TArrayFloat; v: array of GLfloat); inline;
 231     var i, j, vpx: Integer;
 232   begin
 233     i := Length(x);
 234     vpx := Length(v);
 235     if (cmds.mode = GL_QUADS) and (i div vpx mod 4 = 3) then
 236     begin
 237       for j := 0 to vpx - 1 do
 238         AddFloatRaw(x, x[i - 3*vpx + j]);
 239       for j := 0 to vpx - 1 do
 240         AddFloatRaw(x, x[i - 1*vpx + j]);
 241     end;
 242     for j := 0 to vpx - 1 do
 243       AddFloatRaw(x, v[j]);
 244   end;
 245
 246 (* ---------- end internals ---------- *)
 247
 248   procedure glVertex2f(x, y: GLfloat);
 249   begin
 250     AddFloatX(cmds.v, [x, y]);
 251   end;
 252
 253   procedure glVertex2i(x, y: GLint);
 254   begin
 255     AddFloatX(cmds.v, [x, y]);
 256   end;
 257
 258   procedure glColor4f(red, green, blue, alpha: GLfloat);
 259   begin
 260     if cmds.mode = GL_INVALID_ENUM then
 261       es_glColor4f(red, green, blue, alpha)
 262     else
 263       AddFloatX(cmds.c, [red, green, blue, alpha])
 264   end;
 265
 266   procedure glColor4ub(red, green, blue, alpha: GLubyte);
 267   begin
 268     glColor4f(red / 255, green / 255, blue / 255, alpha / 255)
 269   end;
 270
 271   procedure glColor3ub(red, green, blue: GLubyte);
 272   begin
 273     glColor4f(red / 255, green / 255, blue / 255, 255)
 274   end;
 275
 276   procedure glTexCoord2f(s, t: GLfloat);
 277   begin
 278     AddFloatX(cmds.t, [s, t]);
 279   end;
 280
 281   procedure glTexCoord2i(s, t: GLint);
 282   begin
 283     AddFloatX(cmds.t, [s, t]);
 284   end;
 285
 286
 287
 288
 289
 290
 291
 292   procedure glReadPixels(x, y: GLint; width, height: GLsizei; format, atype: GLenum; pixels: Pointer);
 293   begin
 294     es_glReadPixels(x, y, width, height, format, atype, pixels);
 295   end;
 296
 297
 298
 299
 300
 301   procedure glOrtho (left, right, bottom, top, near, far: GLdouble);
 302     var m: array [0..15] of GLfloat;
 303   begin
 304     {es_glOrthof(left, right, bottom, top, near, far);}
 305     m[0] := 2 / (right - left);
 306     m[1] := 0;
 307     m[2] := 0;
 308     m[3] := 0;
 309     m[4] := 0;
 310     m[5] := 2 / (top - bottom);
 311     m[6] := 0;
 312     m[7] := 0;
 313     m[8] := 0;
 314     m[9] := 0;
 315     m[10] := -2 / (far - near);
 316     m[11] := 0;
 317     m[12] := -((right + left) / (right - left));
 318     m[13] := -((top + bottom) / (top - bottom));
 319     m[14] := -((far + near) / (far - near));
 320     m[15] := 1;
 321     es_glMultMatrixf(@m[0]);
 322   end;
 323
 324   procedure glLoadIdentity;
 325   begin
 326     es_glLoadIdentity;
 327   end;
 328
 329   procedure glMatrixMode(mode: GLenum);
 330   begin
 331     es_glMatrixMode(mode);
 332   end;
 333
 334   procedure glLoadMatrixd(const m: PGLdouble);
 335     var
 336       i: Integer;
 337       n: array [0..15] of GLfloat;
 338   begin
 339     for i := 0 to 15 do
 340       n[i] := m[i];
 341     es_glLoadMatrixf(@n[0]);
 342   end;
 343
 344   procedure glPushMatrix;
 345   begin
 346     es_glPushMatrix;
 347   end;
 348
 349   procedure glPopMatrix;
 350   begin
 351     es_glPopMatrix;
 352   end;
 353
 354   procedure glTranslatef(x, y, z: GLfloat);
 355   begin
 356     es_glTranslatef(x, y, z);
 357   end;
 358
 359   procedure glRotatef(angle, x, y, z: GLfloat);
 360   begin
 361     es_glRotatef(angle, x, y, z);
 362   end;
 363
 364   procedure glScalef(x, y, z: GLfloat);
 365   begin
 366     es_glScalef(x, y, z);
 367   end;
 368
 369
 370
 371
 372
 373
 374   procedure glViewport(x, y: GLint; width, height: GLsizei);
 375   begin
 376     es_glViewport(x, y, width, height);
 377   end;
 378
 379   procedure glScissor(x, y: GLint; width, height: GLsizei);
 380   begin
 381     es_glScissor(x, y, width, height);
 382   end;
 383
 384   procedure glStencilMask(mask: GLuint);
 385   begin
 386     es_glStencilMask(mask);
 387   end;
 388
 389   procedure glStencilFunc(func: GLenum; ref: GLint; mask: GLuint);
 390   begin
 391     es_glStencilFunc(func, ref, mask);
 392   end;
 393
 394   procedure glStencilOp(fail, zfail, zpass: GLenum);
 395   begin
 396     es_glStencilOp(fail, zfail, zpass);
 397   end;
 398
 399   procedure glColorMask(red, green, blue, alpha: GLboolean);
 400   begin
 401     es_glColorMask(red, green, blue, alpha);
 402   end;
 403
 404
 405
 406
 407
 408
 409   procedure glBindTexture(target: GLenum; texture: GLuint);
 410   begin
 411     es_glBindTexture(target, texture);
 412   end;
 413
 414   procedure glGenTextures(n: GLsizei; textures: PGLuint);
 415   begin
 416     es_glGenTextures(n, textures);
 417   end;
 418
 419   procedure glTexEnvi(target: GLenum; pname: GLenum; param: GLint);
 420   begin
 421     es_glTexEnvi(target, pname, param);
 422   end;
 423
 424   procedure glTexParameterf(target: GLenum; pname: GLenum; param: GLfloat);
 425   begin
 426     es_glTexParameterf(target, pname, param);
 427   end;
 428
 429   procedure glTexParameteri(target: GLenum; pname: GLenum; param: GLint);
 430   begin
 431     es_glTexParameteri(target, pname, param);
 432   end;
 433
 434   procedure glTexImage2D(target: GLenum; level, internalformat: GLint; width, height: GLsizei; border: GLint; format, atype: GLenum; const pixels: Pointer);
 435   begin
 436     es_glTexImage2D(target, level, internalformat, width, height, border, format, atype, pixels);
 437   end;
 438
 439   procedure glTexSubImage2D(target: GLenum; level, xoffset, yoffset: GLint; width, height: GLsizei; format, atype: GLenum; const pixels: Pointer);
 440   begin
 441     es_glTexSubImage2D(target, level, xoffset, yoffset, width, height, format, atype, pixels);
 442   end;
 443
 444   procedure glDeleteTextures(n: GLsizei; const textures: PGLuint);
 445   begin
 446     es_glDeleteTextures(n, textures);
 447   end;
 448
 449
 450
 451
 452
 453
 454   procedure glGenFramebuffers(n: GLsizei; framebuffers: PGLuint);
 455   begin
 456     es_glGenFramebuffers(n, framebuffers);
 457   end;
 458
 459   procedure glBindFramebuffer(target: GLenum; framebuffer: GLuint);
 460   begin
 461     es_glBindFramebuffer(target, framebuffer);
 462   end;
 463
 464   procedure glFramebufferTexture2D(target, attachment, textarget: GLenum; texture: GLuint; level: GLint);
 465   begin
 466     es_glFramebufferTexture2D(target, attachment, textarget, texture, level);
 467   end;
 468
 469   procedure glFramebufferRenderbuffer(target, attachment, rbotarget: GLenum; rbo: GLuint);
 470   begin
 471     es_glFramebufferRenderbuffer(target, attachment, rbotarget, rbo);
 472   end;
 473
 474   function glCheckFramebufferStatus(framebuffer: GLuint): GLenum;
 475   begin
 476     result := es_glCheckFramebufferStatus(framebuffer);
 477   end;
 478
 479   procedure glDeleteFramebuffers(n: GLsizei; const framebuffers: PGLuint);
 480   begin
 481     es_glDeleteFramebuffers(n, framebuffers);
 482   end;
 483
 484   procedure glGenRenderbuffers(n: GLsizei; renderbuffers: PGLuint);
 485   begin
 486     es_glGenRenderbuffers(n, renderbuffers);
 487   end;
 488
 489   procedure glBindRenderbuffer(target: GLenum; renderbuffer: GLuint);
 490   begin
 491     es_glBindRenderbuffer(target, renderbuffer);
 492   end;
 493
 494   procedure glRenderbufferStorage(target, internalformat: GLenum; w, h: GLsizei);
 495   begin
 496     es_glRenderbufferStorage(target, internalformat, w, h);
 497   end;
 498
 499   procedure glDeleteRenderbuffers(n: GLsizei; const renderbuffers: PGLuint);
 500   begin
 501     es_glDeleteRenderbuffers(n, renderbuffers);
 502   end;
 503
 504
 505
 506
 507
 508
 509   procedure nogl_Init;
 510   begin
 511     es_glVertexPointer := SDL_GL_GetProcAddress('glVertexPointer');
 512     es_glColorPointer := SDL_GL_GetProcAddress('glColorPointer');
 513     es_glTexCoordPointer := SDL_GL_GetProcAddress('glTexCoordPointer');
 514     es_glEnableClientState := SDL_GL_GetProcAddress('glEnableClientState');
 515     es_glDisableClientState := SDL_GL_GetProcAddress('glDisableClientState');
 516     es_glDrawArrays := SDL_GL_GetProcAddress('glDrawArrays');
 517 //    es_glActiveTexture := SDL_GL_GetProcAddress('glActiveTexture');
 518 //    es_glClientActiveTexture := SDL_GL_GetProcAddress('glClientActiveTexture');
 519     es_glColor4f := SDL_GL_GetProcAddress('glColor4f');
 520
 521     es_glEnable := SDL_GL_GetProcAddress('glEnable');
 522     es_glDisable := SDL_GL_GetProcAddress('glDisable');
 523     es_glIsEnabled := SDL_GL_GetProcAddress('glIsEnabled');
 524     es_glGetString := SDL_GL_GetProcAddress('glGetString');
 525     es_glGetError := SDL_GL_GetProcAddress('glGetError');
 526     es_glClearColor := SDL_GL_GetProcAddress('glClearColor');
 527     es_glClear := SDL_GL_GetProcAddress('glClear');
 528     es_glAlphaFunc := SDL_GL_GetProcAddress('glAlphaFunc');
 529     es_glBlendFunc := SDL_GL_GetProcAddress('glBlendFunc');
 530     es_glPointSize := SDL_GL_GetProcAddress('glPointSize');
 531     es_glLineWidth := SDL_GL_GetProcAddress('glLineWidth');
 532     es_glGetIntegerv := SDL_GL_GetProcAddress('glGetIntegerv');
 533     es_glFlush := SDL_GL_GetProcAddress('glFlush');
 534     es_glFinish := SDL_GL_GetProcAddress('glFinish');
 535
 536     es_glMultMatrixf := SDL_GL_GetProcAddress('glMultMatrixf');
 537     //es_glOrthof := SDL_GL_GetProcAddress('glOrthof');
 538     es_glLoadIdentity := SDL_GL_GetProcAddress('glLoadIdentity');
 539     es_glMatrixMode := SDL_GL_GetProcAddress('glMatrixMode');
 540     es_glLoadMatrixf := SDL_GL_GetProcAddress('glLoadMatrixf');
 541     es_glPushMatrix := SDL_GL_GetProcAddress('glPushMatrix');
 542     es_glPopMatrix := SDL_GL_GetProcAddress('glPopMatrix');
 543     es_glTranslatef := SDL_GL_GetProcAddress('glTranslatef');
 544     es_glRotatef := SDL_GL_GetProcAddress('glRotatef');
 545     es_glScalef := SDL_GL_GetProcAddress('glScalef');
 546
 547     es_glReadPixels := SDL_GL_GetProcAddress('glReadPixels');
 548
 549     es_glViewport := SDL_GL_GetProcAddress('glViewport');
 550     es_glScissor := SDL_GL_GetProcAddress('glScissor');
 551     es_glStencilMask := SDL_GL_GetProcAddress('glStencilMask');
 552     es_glStencilFunc := SDL_GL_GetProcAddress('glStencilFunc');
 553     es_glStencilOp := SDL_GL_GetProcAddress('glStencilOp');
 554     es_glColorMask := SDL_GL_GetProcAddress('glColorMask');
 555
 556     es_glBindTexture := SDL_GL_GetProcAddress('glBindTexture');
 557     es_glGenTextures := SDL_GL_GetProcAddress('glGenTextures');
 558     es_glTexEnvi := SDL_GL_GetProcAddress('glTexEnvi');
 559     es_glTexParameterf := SDL_GL_GetProcAddress('glTexParameterf');
 560     es_glTexParameteri := SDL_GL_GetProcAddress('glTexParameteri');
 561     es_glTexImage2D := SDL_GL_GetProcAddress('glTexImage2D');
 562     es_glTexSubImage2D := SDL_GL_GetProcAddress('glTexSubImage2D');
 563     es_glDeleteTextures := SDL_GL_GetProcAddress('glDeleteTextures');
 564
 565     es_glGenFramebuffers := SDL_GL_GetProcAddress('glGenFramebuffersOES');
 566     es_glBindFramebuffer := SDL_GL_GetProcAddress('glBindFramebufferOES');
 567     es_glFramebufferTexture2D := SDL_GL_GetProcAddress('glFramebufferTexture2DOES');;
 568     es_glFramebufferRenderbuffer := SDL_GL_GetProcAddress('glFramebufferRenderbufferOES');
 569     es_glCheckFramebufferStatus := SDL_GL_GetProcAddress('glCheckFramebufferStatusOES');
 570     es_glDeleteFramebuffers := SDL_GL_GetProcAddress('glDeleteFramebuffersOES');
 571
 572     es_glGenRenderbuffers := SDL_GL_GetProcAddress('glGenRenderbuffersOES');
 573     es_glBindRenderbuffer := SDL_GL_GetProcAddress('glBindRenderbufferOES');
 574     es_glRenderbufferStorage := SDL_GL_GetProcAddress('glRenderbufferStorageOES');
 575     es_glDeleteRenderbuffers := SDL_GL_GetProcAddress('glDeleteRenderbuffersOES');
 576
 577     cmds.mode := GL_INVALID_ENUM
 578   end;
 579
 580   procedure nogl_Quit;
 581   begin
 582     es_glVertexPointer := nil;
 583     es_glColorPointer := nil;
 584     es_glTexCoordPointer := nil;
 585     es_glEnableClientState := nil;
 586     es_glDisableClientState := nil;
 587     es_glDrawArrays := nil;
 588 //    es_glActiveTexture := nil;
 589 //    es_glClientActiveTexture := nil;
 590     es_glColor4f := nil;
 591
 592     es_glEnable := nil;
 593     es_glDisable := nil;
 594     es_glIsEnabled := nil;
 595     es_glGetString := nil;
 596     es_glClearColor := nil;
 597     es_glClear := nil;
 598     es_glAlphaFunc := nil;
 599     es_glBlendFunc := nil;
 600     es_glPointSize := nil;
 601     es_glLineWidth := nil;
 602     es_glGetIntegerv := nil;
 603     es_glFlush := nil;
 604     es_glFinish := nil;
 605
 606     es_glMultMatrixf := nil;
 607     //es_glOrthof := nil;
 608     es_glLoadIdentity := nil;
 609     es_glMatrixMode := nil;
 610     es_glLoadMatrixf := nil;
 611     es_glPushMatrix := nil;
 612     es_glPopMatrix := nil;
 613     es_glTranslatef := nil;
 614     es_glRotatef := nil;
 615     es_glScalef := nil;
 616
 617     es_glReadPixels := nil;
 618
 619     es_glViewport := nil;
 620     es_glScissor := nil;
 621     es_glStencilMask := nil;
 622     es_glStencilFunc := nil;
 623     es_glStencilOp := nil;
 624     es_glColorMask := nil;
 625
 626     es_glBindTexture := nil;
 627     es_glGenTextures := nil;
 628     es_glTexEnvi := nil;
 629     es_glTexParameterf := nil;
 630     es_glTexParameteri := nil;
 631     es_glTexImage2D := nil;
 632     es_glTexSubImage2D := nil;
 633     es_glDeleteTextures := nil;
 634
 635     es_glGenFramebuffers := nil;
 636     es_glBindFramebuffer := nil;
 637     es_glFramebufferTexture2D := nil;
 638     es_glFramebufferRenderbuffer := nil;
 639     es_glCheckFramebufferStatus := nil;
 640     es_glDeleteFramebuffers := nil;
 641
 642     es_glGenRenderbuffers := nil;
 643     es_glBindRenderbuffer := nil;
 644     es_glRenderbufferStorage := nil;
 645     es_glDeleteRenderbuffers := nil;
 646   end;
 647
 648   function nogl_ExtensionSupported(ext: string): Boolean;
 649   begin
 650     if (extList = '') and Assigned(es_glGetString) then
 651       extList := glGetString(GL_EXTENSIONS);
 652     result := pos(ext, extList) <> 0;
 653   end;
 654
 655 initialization