lib/mnit/opengles1.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2011-2013 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # OpenGL ES1 general support (most of it)
  18 module opengles1
  19
  20 import display
  21
  22 in "C header" `{
  23         #include <EGL/egl.h>
  24         #include <GLES/gl.h>
  25         #define GL_GLEXT_PROTOTYPES 1
  26         #include <GLES/glext.h>
  27         #include <errno.h>
  28
  29         #define LOGW(...) ((void)fprintf(stderr, "# warn: %s", __VA_ARGS__))
  30         #ifdef DEBUG
  31                 #define LOGI(...) ((void)fprintf(stderr, "# info: %s", __VA_ARGS__))
  32         #else
  33                 #define LOGI(...) (void)0
  34         #endif
  35
  36         EGLDisplay mnit_display;
  37         EGLSurface mnit_surface;
  38         EGLContext mnit_context;
  39         EGLConfig mnit_config;
  40         int32_t mnit_width;
  41         int32_t mnit_height;
  42         float mnit_zoom;
  43
  44         struct mnit_opengles_Texture {
  45                 GLuint texture;
  46
  47                 /* offsets on source texture */
  48                 float src_xo, src_yo, src_xi, src_yi;
  49
  50                 /* destination width and height */
  51                 int width, height;
  52
  53                 /* may vary depending on scaling */
  54                 int center_x, center_y;
  55
  56                 float scale;
  57                 int blended;
  58         };
  59
  60         struct mnit_opengles_DrawableTexture {
  61                 struct mnit_opengles_Texture super;
  62                 GLuint fbo;
  63                 GLuint depth;
  64                 GLuint color;
  65         };
  66
  67         GLenum mnit_opengles_error_code;
  68
  69         struct mnit_opengles_Texture *mnit_opengles_load_image( const uint_least32_t *pixels, int width, int height, int has_alpha );
  70 `}
  71
  72 in "C" `{
  73         extern NativeWindowType mnit_window;
  74         extern EGLNativeDisplayType mnit_native_display;
  75
  76         GLfloat mnit_opengles_vertices[6][3] =
  77         {
  78                 {0.0f, 1.0f, 0.0f},
  79                 {1.0f, 1.0f, 0.0f},
  80                 {0.0f, 0.0f, 0.0f},
  81                 {1.0f, 0.0f, 0.0f},
  82         };
  83         GLfloat mnit_opengles_texture[6][2] =
  84         {
  85                 {0.0f, 0.0f},
  86                 {0.0f, 1.0f},
  87                 {1.0f, 1.0f},
  88                 {0.0f, 0.0f},
  89                 {1.0f, 1.0f},
  90                 {1.0f, 0.0f}
  91         };
  92
  93         struct mnit_opengles_Texture *mnit_opengles_load_image( const uint_least32_t *pixels, int width, int height, int has_alpha )
  94         {
  95                 struct mnit_opengles_Texture *image = malloc(sizeof(struct mnit_opengles_Texture));
  96                 int format = has_alpha? GL_RGBA: GL_RGB;
  97
  98                 image->width = width;
  99                 image->height = height;
 100                 image->center_x = width/2;
 101                 image->center_y = height/2;
 102                 image->scale = 1.0f;
 103                 image->blended = has_alpha;
 104
 105                 image->src_xo = 0;
 106                 image->src_yo = 0;
 107                 image->src_xi = 1.0;
 108                 image->src_yi = 1.0;
 109
 110
 111                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 112                         LOGW ("a error loading image: %i\n", mnit_opengles_error_code);
 113                         printf( "%i\n", mnit_opengles_error_code );
 114                 }
 115                 glGenTextures(1, &image->texture);
 116
 117                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 118                         LOGW ("b error loading image: %i\n", mnit_opengles_error_code);
 119                         printf( "%i\n", mnit_opengles_error_code );
 120                 }
 121                 glBindTexture(GL_TEXTURE_2D, image->texture);
 122
 123                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 124                         LOGW ("c error loading image: %i\n", mnit_opengles_error_code);
 125                         printf( "%i\n", mnit_opengles_error_code );
 126                 }
 127                 glTexImage2D(   GL_TEXTURE_2D, 0, format, width, height,
 128                                                 0, format, GL_UNSIGNED_BYTE, (GLvoid*)pixels);
 129
 130                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 131                         LOGW ("d error loading image: %i\n", mnit_opengles_error_code);
 132                         printf( "%i\n", mnit_opengles_error_code );
 133                 }
 134                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 135
 136                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 137                         LOGW ("e error loading image: %i\n", mnit_opengles_error_code);
 138                         printf( "%i\n", mnit_opengles_error_code );
 139                 }
 140
 141                 return image;
 142         }
 143 `}
 144
 145 # OpenGL ES1 display
 146 # Uses 3d hardware optimization
 147 class Opengles1Display
 148         super Display
 149
 150         redef type I: Opengles1Image
 151
 152         init do extern_init
 153         fun midway_init( format: Int ) do end
 154         fun extern_init: Bool is extern import midway_init `{
 155                 /* initialize OpenGL ES and EGL */
 156                 const EGLint attribs[] = {
 157                                 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 158                                 EGL_BLUE_SIZE, 8,
 159                                 EGL_GREEN_SIZE, 8,
 160                                 EGL_RED_SIZE, 8,
 161                                 EGL_NONE
 162                 };
 163                 EGLint w, h, dummy, format;
 164                 EGLint numConfigs;
 165                 EGLConfig config;
 166                 EGLSurface surface;
 167                 EGLContext context;
 168
 169                 EGLDisplay display = eglGetDisplay(mnit_native_display);
 170                 if ( display == EGL_NO_DISPLAY) {
 171                         LOGW("Unable to eglGetDisplay");
 172                         return -1;
 173                 }
 174
 175                 if ( eglInitialize(display, 0, 0) == EGL_FALSE) {
 176                         LOGW("Unable to eglInitialize");
 177                         return -1;
 178                 }
 179
 180                 if ( eglChooseConfig(display, attribs, &config, 1, &numConfigs) == EGL_FALSE) {
 181                         LOGW("Unable to eglChooseConfig");
 182                         return -1;
 183                 }
 184
 185                 if ( numConfigs == 0 ) {
 186                         LOGW("No configs available for egl");
 187                         return -1;
 188                 }
 189
 190                 if ( eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format) == EGL_FALSE) {
 191                         LOGW("Unable to eglGetConfigAttrib");
 192                         return -1;
 193                 }
 194
 195                 /* Used by Android to set buffer geometry */
 196                 Opengles1Display_midway_init(recv, format);
 197
 198                 surface = eglCreateWindowSurface(display, config, mnit_window, NULL);
 199                 context = eglCreateContext(display, config, NULL, NULL);
 200
 201                 if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
 202                         LOGW("Unable to eglMakeCurrent");
 203                         return -1;
 204                 }
 205
 206                 eglQuerySurface(display, surface, EGL_WIDTH, &w);
 207                 eglQuerySurface(display, surface, EGL_HEIGHT, &h);
 208
 209                 mnit_display = display;
 210                 mnit_context = context;
 211                 mnit_surface = surface;
 212                 mnit_config = config;
 213                 mnit_width = w;
 214                 mnit_height = h;
 215                 mnit_zoom = 1.0f;
 216
 217                 LOGI( "surface: %i, display: %i, w %i, h %i", (int)surface, (int)display, w, h );
 218
 219                 glViewport(0, 0, mnit_width, mnit_height);
 220                 glMatrixMode(GL_PROJECTION);
 221                 glLoadIdentity();
 222                 glOrthof(0.0f, w, h, 0.0f, 0.0f, 1.0f);
 223                 glMatrixMode(GL_MODELVIEW);
 224
 225                 glFrontFace( GL_CW );
 226
 227                 return 0;
 228         `}
 229
 230         fun close is extern `{
 231                 if ( mnit_display != EGL_NO_DISPLAY) {
 232                         eglMakeCurrent( mnit_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 233                         if ( mnit_context != EGL_NO_CONTEXT) {
 234                                 eglDestroyContext( mnit_display,  mnit_context );
 235                         }
 236                         if ( mnit_surface != EGL_NO_SURFACE) {
 237                                 eglDestroySurface( mnit_display,  mnit_surface );
 238                         }
 239                         eglTerminate( mnit_display);
 240                 }
 241                  mnit_display = EGL_NO_DISPLAY;
 242                  mnit_context = EGL_NO_CONTEXT;
 243                  mnit_surface = EGL_NO_SURFACE;
 244         `}
 245
 246         redef fun begin is extern `{
 247                 glClear(GL_COLOR_BUFFER_BIT);
 248                 glLoadIdentity();
 249         `}
 250
 251         redef fun width: Int is extern `{
 252                 return mnit_width;
 253         `}
 254         redef fun height: Int is extern `{
 255                 return mnit_height;
 256         `}
 257
 258         redef fun finish is extern `{
 259                 eglSwapBuffers( mnit_display, mnit_surface );
 260         `}
 261
 262         fun set_as_target is extern `{
 263                 glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
 264         `}
 265
 266         redef fun set_viewport( x, y, w, h ) is extern `{
 267                 glLoadIdentity();
 268                 glViewport(0,0, mnit_width, mnit_height );
 269                 glMatrixMode(GL_PROJECTION);
 270                 glLoadIdentity();
 271                 glOrthof(x, x+w, y+h, y, 0.0f, 1.0f);
 272                 mnit_zoom = ((float)w)/mnit_width;
 273                 glMatrixMode(GL_MODELVIEW);
 274                 glFrontFace( GL_CW );
 275         `}
 276
 277         redef fun blit( image, x, y ) is extern  `{
 278                 GLfloat texture_coord[4][2] =
 279                 {
 280                         {image->src_xo, image->src_yi},
 281                         {image->src_xi, image->src_yi},
 282                         {image->src_xo, image->src_yo},
 283                         {image->src_xi, image->src_yo}
 284                 };
 285
 286                 glLoadIdentity();
 287
 288                 glBindTexture(GL_TEXTURE_2D, image->texture);
 289
 290                 glEnableClientState(GL_VERTEX_ARRAY);
 291                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 292                 glTranslatef( x, y, 0.0f );
 293                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 294
 295                 if ( image->blended ) {
 296                         glEnable(GL_BLEND);
 297                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 298                 }
 299
 300                 glEnable(GL_TEXTURE_2D);
 301                 glDisable(GL_DEPTH_TEST);
 302
 303                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 304                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 305
 306                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 307
 308                 glDisableClientState(GL_VERTEX_ARRAY);
 309                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 310                 if ( image->blended ) glDisable(GL_BLEND);
 311                 glDisable(GL_TEXTURE_2D);
 312
 313                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 314                    LOGW ("error drawing: %i", mnit_opengles_error_code);
 315                 }
 316         `}
 317
 318     redef fun blit_centered( img, x, y )
 319     do
 320                 x = x - img.center_x
 321                 y = y - img.center_y
 322                 blit( img, x, y )
 323     end
 324
 325         redef fun blit_rotated( image, x, y, angle ) is extern  `{
 326                 GLfloat texture_coord[4][2] =
 327                 {
 328                         {image->src_xo, image->src_yi},
 329                         {image->src_xi, image->src_yi},
 330                         {image->src_xo, image->src_yo},
 331                         {image->src_xi, image->src_yo}
 332                 };
 333
 334                 glLoadIdentity();
 335
 336                 glBindTexture(GL_TEXTURE_2D, image->texture);
 337
 338                 glEnableClientState(GL_VERTEX_ARRAY);
 339                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 340                 glTranslatef( x, y, 0.0f );
 341                 glRotatef( angle*180.0f/3.14156f, 0, 0, 1.0f );
 342                 glTranslatef( image->width*image->scale/-2, image->height*image->scale/-2, 0.0f );
 343                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 344                 if ( image->blended ) {
 345                         glEnable(GL_BLEND);
 346                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 347                 }
 348                 glEnable(GL_TEXTURE_2D);
 349                 glDisable(GL_DEPTH_TEST);
 350
 351                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 352                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 353
 354                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 355
 356                 glDisableClientState(GL_VERTEX_ARRAY);
 357                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 358                 if ( image->blended ) glDisable(GL_BLEND);
 359                 glDisable(GL_TEXTURE_2D);
 360
 361                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 362                    LOGW ("error drawing: %i", mnit_opengles_error_code);
 363                 }
 364         `}
 365
 366         # a = top left, b = bottom left, c = bottom right, d = top right
 367         redef fun blit_stretched( image, ax, ay, bx, by, cx, cy, dx, dy ) is extern  `{
 368                 GLfloat texture_coord[4][2] =
 369                 {
 370                         {image->src_xo, image->src_yi},
 371                         {image->src_xi, image->src_yi},
 372                         {image->src_xo, image->src_yo},
 373                         {image->src_xi, image->src_yo}
 374                 };
 375
 376                 GLfloat mnit_opengles_vertices_stretched[6][3] =
 377                 {
 378                         {bx, by, 0.0f},
 379                         {cx, cy, 0.0f},
 380                         {ax, ay, 0.0f},
 381                         {dx, dy, 0.0f},
 382                 };
 383
 384                 glLoadIdentity();
 385
 386                 glBindTexture(GL_TEXTURE_2D, image->texture);
 387
 388                 glEnableClientState(GL_VERTEX_ARRAY);
 389                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 390
 391                 if ( image->blended ) {
 392                         glEnable(GL_BLEND);
 393                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 394                 }
 395
 396                 glEnable(GL_TEXTURE_2D);
 397                 glDisable(GL_DEPTH_TEST);
 398
 399                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices_stretched);
 400                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 401
 402                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 403
 404                 glDisableClientState(GL_VERTEX_ARRAY);
 405                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 406                 if ( image->blended ) glDisable(GL_BLEND);
 407                 glDisable(GL_TEXTURE_2D);
 408
 409                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 410                    LOGW ("error drawing: %i", mnit_opengles_error_code);
 411                 }
 412         `}
 413
 414         redef fun clear( r, g, b: Float ) is extern `{
 415                 glClearColor( r, g, b, 1.0 );
 416                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 417         `}
 418
 419         fun clear_alpha( r, g, b, a: Float ) is extern `{
 420                 glClearColor( r, g, b, a );
 421                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 422         `}
 423 end
 424
 425 extern Opengles1Image in "C" `{struct mnit_opengles_Texture *`}
 426         super Image
 427
 428     redef fun destroy is extern `{ free( recv ); `}
 429
 430     redef fun width: Int is extern `{ return recv->width; `}
 431     redef fun height: Int is extern `{ return recv->height; `}
 432
 433         fun center_x: Int `{ return recv->center_x; `}
 434         fun center_y: Int `{ return recv->center_y; `}
 435
 436     redef fun scale=( v: Float ) is extern `{
 437                 recv->scale = v;
 438                 recv->center_x = v*recv->width/2;
 439                 recv->center_y = v*recv->height/2;
 440     `}
 441     redef fun scale: Float is extern `{ return recv->scale; `}
 442
 443     redef fun blended=( v: Bool ) is extern `{ recv->blended = v; `}
 444     redef fun blended: Bool is extern `{ return recv->blended; `}
 445
 446     # inherits scale and blend from source
 447     redef fun subimage( x, y, w, h: Int ): Image is extern import Opengles1Image.as( Image ) `{
 448                 struct mnit_opengles_Texture* image =
 449                         malloc( sizeof( struct mnit_opengles_Texture ) );
 450
 451                 image->texture = recv->texture;
 452                 image->width = w;
 453                 image->height = h;
 454                 image->center_x = recv->scale*w/2;
 455                 image->center_y = recv->scale*h/2;
 456                 image->scale = recv->scale;
 457                 image->blended = recv->blended;
 458
 459                 image->src_xo = ((float)x)/recv->width;
 460                 image->src_yo = ((float)y)/recv->height;
 461                 image->src_xi = ((float)x+w)/recv->width;
 462                 image->src_yi = ((float)y+h)/recv->height;
 463
 464                 return Opengles1Image_as_Image( image );
 465     `}
 466 end
 467
 468 # FIXME this class is broken
 469 extern Opengles1DrawableImage in "C" `{struct mnit_opengles_DrawableTexture*`}
 470         super DrawableImage
 471     new ( w, h: Int ) is extern `{
 472                 struct mnit_opengles_DrawableTexture *image =
 473                         malloc( sizeof(struct mnit_opengles_DrawableTexture) );
 474
 475                 /* texture */
 476                 glGenTextures(1, &image->super.texture);
 477                 glBindTexture(GL_TEXTURE_2D, image->super.texture);
 478                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 479                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 480                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
 481                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 482                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 483                 /* glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE); // automatic mipmap generation included in OpenGL v1.4c */
 484                 glBindTexture(GL_TEXTURE_2D, 0);
 485
 486                 /* fbo */
 487                 glGenFramebuffersOES( 1, &image->fbo );
 488                 glBindFramebufferOES( GL_FRAMEBUFFER_OES, image->fbo );
 489                 glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
 490                                 GL_COLOR_ATTACHMENT0_OES,
 491                                 GL_TEXTURE_2D,
 492                                 image->super.texture,
 493                                 0 );
 494
 495                 /* depth */
 496                 glGenRenderbuffersOES(1, &image->depth);
 497                 glBindRenderbufferOES(GL_RENDERBUFFER_OES, image->depth);
 498                 glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES,
 499                                          w, h);
 500                 glBindRenderbufferOES(GL_RENDERBUFFER_OES, 0);
 501                 glFramebufferRenderbufferOES( GL_FRAMEBUFFER_OES,
 502                         GL_DEPTH_ATTACHMENT_OES,
 503                         GL_RENDERBUFFER_OES,
 504                         image->depth );
 505
 506                 /* tex framebuffer */
 507                 glGenRenderbuffersOES(1, &image->color);
 508                 glBindRenderbufferOES(GL_RENDERBUFFER_OES, image->color);
 509                 glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_RGBA8_OES, w, h);
 510                 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, image->color );
 511
 512                 if ( glCheckFramebufferStatusOES( GL_FRAMEBUFFER_OES ) != GL_FRAMEBUFFER_COMPLETE_OES )
 513                 {
 514                         LOGW( "framebuffer not set" );
 515                         if ( glCheckFramebufferStatusOES( GL_FRAMEBUFFER_OES ) == GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_OES )
 516                                 LOGW( "framebuffer not set a" );
 517                         else if ( glCheckFramebufferStatusOES( GL_FRAMEBUFFER_OES ) == GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_OES )
 518                                 LOGW( "framebuffer not set b" );
 519                         else if ( glCheckFramebufferStatusOES( GL_FRAMEBUFFER_OES ) == GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_OES )
 520                                 LOGW( "framebuffer not set c" );
 521                         else if ( glCheckFramebufferStatusOES( GL_FRAMEBUFFER_OES ) == GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_OES )
 522                                 LOGW( "framebuffer not set d" );
 523                 }
 524
 525                 image->super.width = w;
 526                 image->super.height = h;
 527                 image->super.center_x = w/2;
 528                 image->super.center_y = h/2;
 529                 image->super.scale = 1.0f;
 530                 image->super.blended = 0;
 531
 532                 if (glGetError() != GL_NO_ERROR) LOGW( "gl error");
 533
 534                 return image;
 535         `}
 536
 537     fun set_as_target is extern `{
 538                 LOGI( "sat %i", recv->fbo );
 539                 glBindFramebufferOES(GL_FRAMEBUFFER_OES, recv->fbo);
 540                 if (glGetError() != GL_NO_ERROR) LOGW( "gl error 0");
 541                 /*glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES,&recv->fbo);
 542                 if (glGetError() != GL_NO_ERROR) LOGW( "gl error a");*/
 543                 glViewport(0, 0, recv->super.width, recv->super.height);
 544
 545                 glMatrixMode(GL_PROJECTION);
 546                 glLoadIdentity();
 547                 glOrthof(0.0f, recv->super.width, recv->super.height, 0.0f, 0.0f, 1.0f);
 548                 glMatrixMode(GL_MODELVIEW);
 549                 glFrontFace( GL_CW );
 550
 551                 glClearColor( 0.0f, 1.0f, 1.0f, 1.0f );
 552                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 553         `}
 554
 555     fun unset_as_target is extern `{
 556                 glFlush();
 557                 /*glBindTexture(GL_TEXTURE_2D, recv->super.texture);
 558                 glGenerateMipmapOES(GL_TEXTURE_2D);
 559                 glBindTexture(GL_TEXTURE_2D, 0);*/
 560                 glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
 561                 if (glGetError() != GL_NO_ERROR) LOGW( "gl error");
 562         `}
 563 end
 564