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
  14   const
  15     ValPerVertex = 2;
  16     ValPerColor = 4;
  17     ValPerCoord = 2;
  18
  19   type
  20     TArrayFloat = array of GLfloat;
  21
  22     TCmds = record
  23       mode: GLenum;
  24       v, c, t: TArrayFloat;
  25     end;
  26
  27   var
  28     cmds: TCmds;
  29
  30   var
  31     extList: string = '';
  32
  33   var
  34     es_glVertexPointer: procedure (size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); cdecl;
  35     es_glColorPointer: procedure (size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); cdecl;
  36     es_glTexCoordPointer: procedure (size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); cdecl;
  37     es_glEnableClientState: procedure (arr: GLenum); cdecl;
  38     es_glDisableClientState: procedure (arr: GLenum); cdecl;
  39     es_glDrawArrays: procedure (mode: GLenum; first: GLint; count: GLsizei); cdecl;
  40 //    es_glActiveTexture: procedure(texture: GLenum); cdecl;
  41 //    es_glClientActiveTexture: procedure(texture: GLenum); cdecl;
  42     es_glColor4f: procedure(red, green, blue, alpha: GLfloat); cdecl;
  43
  44     es_glEnable: procedure (cap: GLenum); cdecl;
  45     es_glDisable: procedure (cap: GLenum); cdecl;
  46     es_glIsEnabled: function (cap: GLenum): GLBoolean; cdecl;
  47     es_glGetString: function (name: GLenum): PChar; cdecl;
  48     es_glGetError: function (): GLenum; cdecl;
  49     es_glClearColor: procedure (red, green, blue, alpha: GLclampf); cdecl;
  50     es_glClear: procedure (mask: GLbitfield); cdecl;
  51     es_glAlphaFunc: procedure (func: GLenum; ref: GLclampf); cdecl;
  52     es_glBlendFunc: procedure (sfactor, dfactor: GLenum); cdecl;
  53     es_glPointSize: procedure (size: GLfloat); cdecl;
  54     es_glLineWidth: procedure (width: GLfloat); cdecl;
  55     es_glGetIntegerv: procedure (pname: GLenum; params: PGLint); cdecl;
  56     es_glFlush: procedure; cdecl;
  57     es_glFinish: procedure; cdecl;
  58
  59     es_glMultMatrixf: procedure (m: PGLfloat); cdecl;
  60     es_glOrthof: procedure (left, right, bottom, top, near, far: GLfloat); cdecl;
  61     es_glLoadIdentity: procedure; cdecl;
  62     es_glMatrixMode: procedure (mode: GLenum); cdecl;
  63     es_glLoadMatrixf: procedure (m: PGLfloat); cdecl;
  64     es_glPushMatrix: procedure; cdecl;
  65     es_glPopMatrix: procedure; cdecl;
  66     es_glTranslatef: procedure (x, y, z: GLfloat); cdecl;
  67     es_glRotatef: procedure (angle, x, y, z: GLfloat); cdecl;
  68     es_glScalef: procedure (x, y, z: GLfloat); cdecl;
  69
  70     es_glReadPixels: procedure (x, y: GLint; width, height: GLsizei; format,_type: GLenum; pixels: PGLvoid); cdecl;
  71
  72     es_glViewport: procedure (x, y: GLint; width, height: GLsizei); cdecl;
  73     es_glScissor: procedure (x, y: GLint; width, height: GLsizei); cdecl;
  74     es_glStencilMask: procedure (mask: GLuint); cdecl;
  75     es_glStencilFunc: procedure (func: GLenum; ref: GLint; mask: GLuint); cdecl;
  76     es_glStencilOp: procedure (fail, zfail, zpass: GLenum); cdecl;
  77     es_glColorMask: procedure (red: GLboolean; green: GLboolean; blue: GLboolean; alpha: GLboolean); cdecl;
  78
  79     es_glBindTexture: procedure (target: GLenum; texture: GLuint); cdecl;
  80     es_glGenTextures: procedure (n: GLsizei; textures: PGLuint); cdecl;
  81     es_glTexEnvi: procedure (target: GLenum; pname: GLenum; param: GLint); cdecl;
  82     es_glTexParameterf: procedure (target: GLenum; pname: GLenum; param: GLfloat); cdecl;
  83     es_glTexParameteri: procedure (target: GLenum; pname: GLenum; param: GLint); cdecl;
  84     es_glTexImage2D: procedure (target: GLenum; level, internalformat: GLint; width, height: GLsizei; border: GLint; format, _type:GLenum; pixels: PGLvoid); cdecl;
  85     es_glTexSubImage2D: procedure (target: GLenum; level: GLint; xoffset, yoffset: GLint; width, height: GLsizei; format, _type: GLenum; pixels: PGLvoid); cdecl;
  86     es_glDeleteTextures: procedure (n: GLsizei; textures: PGLuint); cdecl;
  87
  88     es_glGenFramebuffers: procedure (n: GLsizei; framebuffers: PGLuint); cdecl;
  89     es_glBindFramebuffer: procedure (target: GLenum; framebuffer: GLuint); cdecl;
  90     es_glFramebufferTexture2D: procedure (target, attachment, textarget: GLenum; texture: GLuint; level: GLint); cdecl;
  91     es_glFramebufferRenderbuffer: procedure (target, attachment, rbotarget: GLenum; rbo: GLuint); cdecl;
  92     es_glCheckFramebufferStatus: function (framebuffer: GLuint): GLenum; cdecl;
  93     es_glDeleteFramebuffers: procedure (n: GLsizei; const framebuffers: PGLuint); cdecl;
  94
  95     es_glGenRenderbuffers: procedure (n: GLsizei; framebuffers: PGLuint); cdecl;
  96     es_glBindRenderbuffer: procedure (target: GLenum; renderbuffer: GLuint); cdecl;
  97     es_glRenderbufferStorage: procedure (target, internalformat: GLenum; w, h: GLsizei); cdecl;
  98     es_glDeleteRenderbuffers: procedure (n: GLsizei; const renderbuffers: PGLuint); cdecl;
  99
 100   procedure glEnable(cap: GLenum);
 101   begin
 102     es_glEnable(cap);
 103   end;
 104
 105   procedure glDisable(cap: GLenum);
 106   begin
 107     es_glDisable(cap);
 108   end;
 109
 110   function glIsEnabled(cap: GLenum): GLboolean;
 111   begin
 112     result := es_glIsEnabled(cap);
 113   end;
 114
 115   function glGetString(name: GLenum): PChar;
 116   begin
 117     result := es_glGetString(name);
 118   end;
 119
 120   function glGetError: GLenum;
 121   begin
 122     result := es_glGetError
 123   end;
 124
 125   procedure glClearColor(red, green, blue, alpha: GLclampf);
 126   begin
 127     es_glClearColor(red, green, blue, alpha);
 128   end;
 129
 130   procedure glClear(mask: GLbitfield);
 131   begin
 132     es_glClear(mask);
 133   end;
 134
 135   procedure glAlphaFunc(func: GLenum; ref: GLclampf);
 136   begin
 137     es_glAlphaFunc(func, ref);
 138   end;
 139
 140   procedure glBlendFunc(sfactor, dfactor: GLenum);
 141   begin
 142     es_glBlendFunc(sfactor, dfactor);
 143   end;
 144
 145   procedure glPointSize(size: GLfloat);
 146   begin
 147     es_glPointSize(size);
 148   end;
 149
 150   procedure glLineWidth(width: GLfloat);
 151   begin
 152     es_glLineWidth(width);
 153   end;
 154
 155   procedure glGetIntegerv(pname: GLenum; params: PGLint);
 156   begin
 157     es_glGetIntegerv(pname, params);
 158   end;
 159
 160   procedure glFlush;
 161   begin
 162     es_glFlush;
 163   end;
 164
 165   procedure glFinish;
 166   begin
 167     es_glFinish;
 168   end;
 169
 170
 171
 172
 173
 174   procedure glBegin(mode: GLenum);
 175   begin
 176     assert(cmds.mode = GL_INVALID_ENUM);
 177     assert((mode = GL_POINTS) or (mode = GL_LINES) or (mode = GL_QUADS) or (mode = GL_LINE_LOOP));
 178     cmds.mode := mode;
 179     SetLength(cmds.v, 0);
 180     SetLength(cmds.c, 0);
 181     SetLength(cmds.t, 0);
 182   end;
 183
 184   procedure glEnd;
 185   begin
 186     assert(cmds.mode <> GL_INVALID_ENUM);
 187     assert(Length(cmds.v) mod ValPerVertex = 0);
 188     assert(Length(cmds.c) mod ValPerColor = 0);
 189     assert(Length(cmds.t) mod ValPerCoord = 0);
 190     if Length(cmds.c) <> 0 then
 191       assert(Length(cmds.v) div ValPerVertex = Length(cmds.c) div ValPerColor);
 192     if Length(cmds.t) <> 0 then
 193       assert(Length(cmds.v) div ValPerVertex = Length(cmds.t) div ValPerCoord);
 194
 195     es_glVertexPointer(ValPerVertex, GL_FLOAT, 0, @cmds.v[0]);
 196     es_glColorPointer(ValPerColor, GL_FLOAT, 0, @cmds.c[0]);
 197     es_glTexCoordPointer(ValPerCoord, GL_FLOAT, 0, @cmds.t[0]);
 198     es_glEnableClientState(GL_VERTEX_ARRAY);
 199     es_glEnableClientState(GL_COLOR_ARRAY);
 200     es_glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 201     es_glDisableClientState(GL_NORMAL_ARRAY);
 202
 203     if Length(cmds.c) = 0 then
 204       es_glDisableClientState(GL_COLOR_ARRAY);
 205     if Length(cmds.t) = 0 then
 206       es_glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 207
 208     if cmds.mode = GL_QUADS then
 209       es_glDrawArrays(GL_TRIANGLES, 0, Length(cmds.v) div ValPerVertex)
 210     else
 211       es_glDrawArrays(cmds.mode, 0, Length(cmds.v) div ValPerVertex);
 212
 213     SetLength(cmds.v, 0);
 214     SetLength(cmds.c, 0);
 215     SetLength(cmds.t, 0);
 216     cmds.mode := GL_INVALID_ENUM;
 217   end;
 218
 219 (* ---------- begin internals ---------- *)
 220
 221   procedure AddFloatRaw (var x: TArrayFloat; f: GLfloat);
 222     var i: Integer;
 223   begin
 224     i := Length(x);
 225     SetLength(x, i + 1);
 226     x[i] := f;
 227   end;
 228
 229   procedure AddFloatX (var x: TArrayFloat; v: array of GLfloat); inline;
 230     var i, j, vpx: Integer;
 231   begin
 232     i := Length(x);
 233     vpx := Length(v);
 234     if (cmds.mode = GL_QUADS) and (i div vpx mod 6 = 3) then
 235     begin
 236       for j := 0 to vpx - 1 do AddFloatRaw(x, x[i - 1*vpx + j]);
 237       for j := 0 to vpx - 1 do AddFloatRaw(x, v[j]);
 238       for j := 0 to vpx - 1 do AddFloatRaw(x, x[i - 3*vpx + j]);
 239     end
 240     else
 241     begin
 242       for j := 0 to vpx - 1 do AddFloatRaw(x, v[j]);
 243     end;
 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     if assigned(es_glOrthof) then
 305     begin
 306       es_glOrthof(left, right, bottom, top, near, far);
 307     end
 308     else
 309     begin
 310       m[0] := 2 / (right - left);
 311       m[1] := 0;
 312       m[2] := 0;
 313       m[3] := 0;
 314       m[4] := 0;
 315       m[5] := 2 / (top - bottom);
 316       m[6] := 0;
 317       m[7] := 0;
 318       m[8] := 0;
 319       m[9] := 0;
 320       m[10] := -2 / (far - near);
 321       m[11] := 0;
 322       m[12] := -((right + left) / (right - left));
 323       m[13] := -((top + bottom) / (top - bottom));
 324       m[14] := -((far + near) / (far - near));
 325       m[15] := 1;
 326       es_glMultMatrixf(@m[0]);
 327     end;
 328   end;
 329
 330   procedure glLoadIdentity;
 331   begin
 332     es_glLoadIdentity;
 333   end;
 334
 335   procedure glMatrixMode(mode: GLenum);
 336   begin
 337     es_glMatrixMode(mode);
 338   end;
 339
 340   procedure glLoadMatrixd(const m: PGLdouble);
 341     var
 342       i: Integer;
 343       n: array [0..15] of GLfloat;
 344   begin
 345     for i := 0 to 15 do
 346       n[i] := m[i];
 347     es_glLoadMatrixf(@n[0]);
 348   end;
 349
 350   procedure glPushMatrix;
 351   begin
 352     es_glPushMatrix;
 353   end;
 354
 355   procedure glPopMatrix;
 356   begin
 357     es_glPopMatrix;
 358   end;
 359
 360   procedure glTranslatef(x, y, z: GLfloat);
 361   begin
 362     es_glTranslatef(x, y, z);
 363   end;
 364
 365   procedure glRotatef(angle, x, y, z: GLfloat);
 366   begin
 367     es_glRotatef(angle, x, y, z);
 368   end;
 369
 370   procedure glScalef(x, y, z: GLfloat);
 371   begin
 372     es_glScalef(x, y, z);
 373   end;
 374
 375
 376
 377
 378
 379
 380   procedure glViewport(x, y: GLint; width, height: GLsizei);
 381   begin
 382     es_glViewport(x, y, width, height);
 383   end;
 384
 385   procedure glScissor(x, y: GLint; width, height: GLsizei);
 386   begin
 387     es_glScissor(x, y, width, height);
 388   end;
 389
 390   procedure glStencilMask(mask: GLuint);
 391   begin
 392     es_glStencilMask(mask);
 393   end;
 394
 395   procedure glStencilFunc(func: GLenum; ref: GLint; mask: GLuint);
 396   begin
 397     es_glStencilFunc(func, ref, mask);
 398   end;
 399
 400   procedure glStencilOp(fail, zfail, zpass: GLenum);
 401   begin
 402     es_glStencilOp(fail, zfail, zpass);
 403   end;
 404
 405   procedure glColorMask(red, green, blue, alpha: GLboolean);
 406   begin
 407     es_glColorMask(red, green, blue, alpha);
 408   end;
 409
 410
 411
 412
 413
 414
 415   procedure glBindTexture(target: GLenum; texture: GLuint);
 416   begin
 417     es_glBindTexture(target, texture);
 418   end;
 419
 420   procedure glGenTextures(n: GLsizei; textures: PGLuint);
 421   begin
 422     es_glGenTextures(n, textures);
 423   end;
 424
 425   procedure glTexEnvi(target: GLenum; pname: GLenum; param: GLint);
 426   begin
 427     es_glTexEnvi(target, pname, param);
 428   end;
 429
 430   procedure glTexParameterf(target: GLenum; pname: GLenum; param: GLfloat);
 431   begin
 432     es_glTexParameterf(target, pname, param);
 433   end;
 434
 435   procedure glTexParameteri(target: GLenum; pname: GLenum; param: GLint);
 436   begin
 437     es_glTexParameteri(target, pname, param);
 438   end;
 439
 440   procedure glTexImage2D(target: GLenum; level, internalformat: GLint; width, height: GLsizei; border: GLint; format, atype: GLenum; const pixels: Pointer);
 441   begin
 442     es_glTexImage2D(target, level, internalformat, width, height, border, format, atype, pixels);
 443   end;
 444
 445   procedure glTexSubImage2D(target: GLenum; level, xoffset, yoffset: GLint; width, height: GLsizei; format, atype: GLenum; const pixels: Pointer);
 446   begin
 447     es_glTexSubImage2D(target, level, xoffset, yoffset, width, height, format, atype, pixels);
 448   end;
 449
 450   procedure glDeleteTextures(n: GLsizei; const textures: PGLuint);
 451   begin
 452     es_glDeleteTextures(n, textures);
 453   end;
 454
 455
 456
 457
 458
 459
 460   procedure glGenFramebuffers(n: GLsizei; framebuffers: PGLuint);
 461   begin
 462     es_glGenFramebuffers(n, framebuffers);
 463   end;
 464
 465   procedure glBindFramebuffer(target: GLenum; framebuffer: GLuint);
 466   begin
 467     es_glBindFramebuffer(target, framebuffer);
 468   end;
 469
 470   procedure glFramebufferTexture2D(target, attachment, textarget: GLenum; texture: GLuint; level: GLint);
 471   begin
 472     es_glFramebufferTexture2D(target, attachment, textarget, texture, level);
 473   end;
 474
 475   procedure glFramebufferRenderbuffer(target, attachment, rbotarget: GLenum; rbo: GLuint);
 476   begin
 477     es_glFramebufferRenderbuffer(target, attachment, rbotarget, rbo);
 478   end;
 479
 480   function glCheckFramebufferStatus(framebuffer: GLuint): GLenum;
 481   begin
 482     result := es_glCheckFramebufferStatus(framebuffer);
 483   end;
 484
 485   procedure glDeleteFramebuffers(n: GLsizei; const framebuffers: PGLuint);
 486   begin
 487     es_glDeleteFramebuffers(n, framebuffers);
 488   end;
 489
 490   procedure glGenRenderbuffers(n: GLsizei; renderbuffers: PGLuint);
 491   begin
 492     es_glGenRenderbuffers(n, renderbuffers);
 493   end;
 494
 495   procedure glBindRenderbuffer(target: GLenum; renderbuffer: GLuint);
 496   begin
 497     es_glBindRenderbuffer(target, renderbuffer);
 498   end;
 499
 500   procedure glRenderbufferStorage(target, internalformat: GLenum; w, h: GLsizei);
 501   begin
 502     es_glRenderbufferStorage(target, internalformat, w, h);
 503   end;
 504
 505   procedure glDeleteRenderbuffers(n: GLsizei; const renderbuffers: PGLuint);
 506   begin
 507     es_glDeleteRenderbuffers(n, renderbuffers);
 508   end;
 509
 510
 511
 512
 513
 514
 515   procedure nogl_Init;
 516   begin
 517     es_glVertexPointer := SDL_GL_GetProcAddress('glVertexPointer');
 518     es_glColorPointer := SDL_GL_GetProcAddress('glColorPointer');
 519     es_glTexCoordPointer := SDL_GL_GetProcAddress('glTexCoordPointer');
 520     es_glEnableClientState := SDL_GL_GetProcAddress('glEnableClientState');
 521     es_glDisableClientState := SDL_GL_GetProcAddress('glDisableClientState');
 522     es_glDrawArrays := SDL_GL_GetProcAddress('glDrawArrays');
 523 //    es_glActiveTexture := SDL_GL_GetProcAddress('glActiveTexture');
 524 //    es_glClientActiveTexture := SDL_GL_GetProcAddress('glClientActiveTexture');
 525     es_glColor4f := SDL_GL_GetProcAddress('glColor4f');
 526
 527     es_glEnable := SDL_GL_GetProcAddress('glEnable');
 528     es_glDisable := SDL_GL_GetProcAddress('glDisable');
 529     es_glIsEnabled := SDL_GL_GetProcAddress('glIsEnabled');
 530     es_glGetString := SDL_GL_GetProcAddress('glGetString');
 531     es_glGetError := SDL_GL_GetProcAddress('glGetError');
 532     es_glClearColor := SDL_GL_GetProcAddress('glClearColor');
 533     es_glClear := SDL_GL_GetProcAddress('glClear');
 534     es_glAlphaFunc := SDL_GL_GetProcAddress('glAlphaFunc');
 535     es_glBlendFunc := SDL_GL_GetProcAddress('glBlendFunc');
 536     es_glPointSize := SDL_GL_GetProcAddress('glPointSize');
 537     es_glLineWidth := SDL_GL_GetProcAddress('glLineWidth');
 538     es_glGetIntegerv := SDL_GL_GetProcAddress('glGetIntegerv');
 539     es_glFlush := SDL_GL_GetProcAddress('glFlush');
 540     es_glFinish := SDL_GL_GetProcAddress('glFinish');
 541
 542     es_glMultMatrixf := SDL_GL_GetProcAddress('glMultMatrixf');
 543     es_glOrthof := SDL_GL_GetProcAddress('glOrthof');
 544     es_glLoadIdentity := SDL_GL_GetProcAddress('glLoadIdentity');
 545     es_glMatrixMode := SDL_GL_GetProcAddress('glMatrixMode');
 546     es_glLoadMatrixf := SDL_GL_GetProcAddress('glLoadMatrixf');
 547     es_glPushMatrix := SDL_GL_GetProcAddress('glPushMatrix');
 548     es_glPopMatrix := SDL_GL_GetProcAddress('glPopMatrix');
 549     es_glTranslatef := SDL_GL_GetProcAddress('glTranslatef');
 550     es_glRotatef := SDL_GL_GetProcAddress('glRotatef');
 551     es_glScalef := SDL_GL_GetProcAddress('glScalef');
 552
 553     es_glReadPixels := SDL_GL_GetProcAddress('glReadPixels');
 554
 555     es_glViewport := SDL_GL_GetProcAddress('glViewport');
 556     es_glScissor := SDL_GL_GetProcAddress('glScissor');
 557     es_glStencilMask := SDL_GL_GetProcAddress('glStencilMask');
 558     es_glStencilFunc := SDL_GL_GetProcAddress('glStencilFunc');
 559     es_glStencilOp := SDL_GL_GetProcAddress('glStencilOp');
 560     es_glColorMask := SDL_GL_GetProcAddress('glColorMask');
 561
 562     es_glBindTexture := SDL_GL_GetProcAddress('glBindTexture');
 563     es_glGenTextures := SDL_GL_GetProcAddress('glGenTextures');
 564     es_glTexEnvi := SDL_GL_GetProcAddress('glTexEnvi');
 565     es_glTexParameterf := SDL_GL_GetProcAddress('glTexParameterf');
 566     es_glTexParameteri := SDL_GL_GetProcAddress('glTexParameteri');
 567     es_glTexImage2D := SDL_GL_GetProcAddress('glTexImage2D');
 568     es_glTexSubImage2D := SDL_GL_GetProcAddress('glTexSubImage2D');
 569     es_glDeleteTextures := SDL_GL_GetProcAddress('glDeleteTextures');
 570
 571     es_glGenFramebuffers := SDL_GL_GetProcAddress('glGenFramebuffersOES');
 572     es_glBindFramebuffer := SDL_GL_GetProcAddress('glBindFramebufferOES');
 573     es_glFramebufferTexture2D := SDL_GL_GetProcAddress('glFramebufferTexture2DOES');;
 574     es_glFramebufferRenderbuffer := SDL_GL_GetProcAddress('glFramebufferRenderbufferOES');
 575     es_glCheckFramebufferStatus := SDL_GL_GetProcAddress('glCheckFramebufferStatusOES');
 576     es_glDeleteFramebuffers := SDL_GL_GetProcAddress('glDeleteFramebuffersOES');
 577
 578     es_glGenRenderbuffers := SDL_GL_GetProcAddress('glGenRenderbuffersOES');
 579     es_glBindRenderbuffer := SDL_GL_GetProcAddress('glBindRenderbufferOES');
 580     es_glRenderbufferStorage := SDL_GL_GetProcAddress('glRenderbufferStorageOES');
 581     es_glDeleteRenderbuffers := SDL_GL_GetProcAddress('glDeleteRenderbuffersOES');
 582
 583     cmds.mode := GL_INVALID_ENUM
 584   end;
 585
 586   procedure nogl_Quit;
 587   begin
 588     es_glVertexPointer := nil;
 589     es_glColorPointer := nil;
 590     es_glTexCoordPointer := nil;
 591     es_glEnableClientState := nil;
 592     es_glDisableClientState := nil;
 593     es_glDrawArrays := nil;
 594 //    es_glActiveTexture := nil;
 595 //    es_glClientActiveTexture := nil;
 596     es_glColor4f := nil;
 597
 598     es_glEnable := nil;
 599     es_glDisable := nil;
 600     es_glIsEnabled := nil;
 601     es_glGetString := nil;
 602     es_glClearColor := nil;
 603     es_glClear := nil;
 604     es_glAlphaFunc := nil;
 605     es_glBlendFunc := nil;
 606     es_glPointSize := nil;
 607     es_glLineWidth := nil;
 608     es_glGetIntegerv := nil;
 609     es_glFlush := nil;
 610     es_glFinish := nil;
 611
 612     es_glMultMatrixf := nil;
 613     es_glOrthof := nil;
 614     es_glLoadIdentity := nil;
 615     es_glMatrixMode := nil;
 616     es_glLoadMatrixf := nil;
 617     es_glPushMatrix := nil;
 618     es_glPopMatrix := nil;
 619     es_glTranslatef := nil;
 620     es_glRotatef := nil;
 621     es_glScalef := nil;
 622
 623     es_glReadPixels := nil;
 624
 625     es_glViewport := nil;
 626     es_glScissor := nil;
 627     es_glStencilMask := nil;
 628     es_glStencilFunc := nil;
 629     es_glStencilOp := nil;
 630     es_glColorMask := nil;
 631
 632     es_glBindTexture := nil;
 633     es_glGenTextures := nil;
 634     es_glTexEnvi := nil;
 635     es_glTexParameterf := nil;
 636     es_glTexParameteri := nil;
 637     es_glTexImage2D := nil;
 638     es_glTexSubImage2D := nil;
 639     es_glDeleteTextures := nil;
 640
 641     es_glGenFramebuffers := nil;
 642     es_glBindFramebuffer := nil;
 643     es_glFramebufferTexture2D := nil;
 644     es_glFramebufferRenderbuffer := nil;
 645     es_glCheckFramebufferStatus := nil;
 646     es_glDeleteFramebuffers := nil;
 647
 648     es_glGenRenderbuffers := nil;
 649     es_glBindRenderbuffer := nil;
 650     es_glRenderbufferStorage := nil;
 651     es_glDeleteRenderbuffers := nil;
 652   end;
 653
 654   function nogl_ExtensionSupported(ext: string): Boolean;
 655   begin
 656     if (extList = '') and Assigned(es_glGetString) then
 657       extList := glGetString(GL_EXTENSIONS);
 658     result := pos(ext, extList) <> 0;
 659   end;
 660
 661 initialization