cinelerra-5.1/plugins/framefield/framefield.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "bcdisplayinfo.h"
  23 #include "bcsignals.h"
  24 #include "bchash.h"
  25 #include "filexml.h"
  26 #include "guicast.h"
  27 #include "keyframe.h"
  28 #include "language.h"
  29 #include "pluginvclient.h"
  30 #include "transportque.inc"
  31 #include "vframe.h"
  32
  33 #include <string.h>
  34 #include <stdint.h>
  35
  36
  37 #define TOP_FIELD_FIRST 0
  38 #define BOTTOM_FIELD_FIRST 1
  39
  40 class FrameField;
  41 class FrameFieldWindow;
  42
  43
  44
  45
  46 class FrameFieldConfig
  47 {
  48 public:
  49         FrameFieldConfig();
  50         int equivalent(FrameFieldConfig &src);
  51         int field_dominance;
  52 };
  53
  54
  55
  56
  57 class FrameFieldTop : public BC_Radial
  58 {
  59 public:
  60         FrameFieldTop(FrameField *plugin, FrameFieldWindow *gui, int x, int y);
  61         int handle_event();
  62         FrameField *plugin;
  63         FrameFieldWindow *gui;
  64 };
  65
  66
  67 class FrameFieldBottom : public BC_Radial
  68 {
  69 public:
  70         FrameFieldBottom(FrameField *plugin, FrameFieldWindow *gui, int x, int y);
  71         int handle_event();
  72         FrameField *plugin;
  73         FrameFieldWindow *gui;
  74 };
  75
  76
  77 class FrameFieldDouble : public BC_CheckBox
  78 {
  79 public:
  80         FrameFieldDouble(FrameField *plugin, FrameFieldWindow *gui, int x, int y);
  81         int handle_event();
  82         FrameField *plugin;
  83         FrameFieldWindow *gui;
  84 };
  85
  86 class FrameFieldShift : public BC_CheckBox
  87 {
  88 public:
  89         FrameFieldShift(FrameField *plugin, FrameFieldWindow *gui, int x, int y);
  90         int handle_event();
  91         FrameField *plugin;
  92         FrameFieldWindow *gui;
  93 };
  94
  95 class FrameFieldAvg : public BC_CheckBox
  96 {
  97 public:
  98         FrameFieldAvg(FrameField *plugin, FrameFieldWindow *gui, int x, int y);
  99         int handle_event();
 100         FrameField *plugin;
 101         FrameFieldWindow *gui;
 102 };
 103
 104 class FrameFieldWindow : public PluginClientWindow
 105 {
 106 public:
 107         FrameFieldWindow(FrameField *plugin);
 108         void create_objects();
 109         FrameField *plugin;
 110         FrameFieldTop *top;
 111         FrameFieldBottom *bottom;
 112 };
 113
 114
 115
 116
 117
 118 class FrameField : public PluginVClient
 119 {
 120 public:
 121         FrameField(PluginServer *server);
 122         ~FrameField();
 123
 124         PLUGIN_CLASS_MEMBERS(FrameFieldConfig);
 125
 126         int process_buffer(VFrame *frame,
 127                 int64_t start_position,
 128                 double frame_rate);
 129         int is_realtime();
 130         void save_data(KeyFrame *keyframe);
 131         void read_data(KeyFrame *keyframe);
 132         void update_gui();
 133
 134 // Constructs odd or even rows from the average of the surrounding rows.
 135         void average_rows(int offset, VFrame *frame);
 136
 137         int handle_opengl();
 138
 139 // Last frame requested
 140         int64_t last_frame;
 141 // Field needed
 142         int64_t field_number;
 143 // Frame needed
 144         int64_t current_frame_number;
 145 // Frame stored
 146         int64_t src_frame_number;
 147         VFrame *src_frame;
 148
 149 // Temporary storage of input frame for OpenGL
 150         BC_Texture *src_texture;
 151 // Signal OpenGL handler a new frame was read.
 152         int new_frame;
 153 // Reading frames at a different rate requires us to store the aggregation
 154 // state when the frame isn't read.
 155         int aggregate_rgb601;
 156         int rgb601_direction;
 157 };
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167 REGISTER_PLUGIN(FrameField)
 168
 169
 170
 171 FrameFieldConfig::FrameFieldConfig()
 172 {
 173         field_dominance = TOP_FIELD_FIRST;
 174 }
 175
 176 int FrameFieldConfig::equivalent(FrameFieldConfig &src)
 177 {
 178         return src.field_dominance == field_dominance;
 179 }
 180
 181
 182
 183
 184
 185
 186
 187
 188 FrameFieldWindow::FrameFieldWindow(FrameField *plugin)
 189  : PluginClientWindow(plugin,
 190         210,
 191         160,
 192         200,
 193         160,
 194         0)
 195 {
 196         this->plugin = plugin;
 197 }
 198
 199 void FrameFieldWindow::create_objects()
 200 {
 201         int x = 10, y = 10;
 202         add_subwindow(top = new FrameFieldTop(plugin, this, x, y));
 203         y += top->get_h() + 5;
 204         add_subwindow(bottom = new FrameFieldBottom(plugin, this, x, y));
 205         y += bottom->get_h() + 5;
 206         show_window();
 207         flush();
 208 }
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221 FrameFieldTop::FrameFieldTop(FrameField *plugin,
 222         FrameFieldWindow *gui,
 223         int x,
 224         int y)
 225  : BC_Radial(x,
 226         y,
 227         plugin->config.field_dominance == TOP_FIELD_FIRST,
 228         _("Top field first"))
 229 {
 230         this->plugin = plugin;
 231         this->gui = gui;
 232 }
 233
 234 int FrameFieldTop::handle_event()
 235 {
 236         plugin->config.field_dominance = TOP_FIELD_FIRST;
 237         gui->bottom->update(0);
 238         plugin->send_configure_change();
 239         return 1;
 240 }
 241
 242
 243
 244
 245
 246 FrameFieldBottom::FrameFieldBottom(FrameField *plugin,
 247         FrameFieldWindow *gui,
 248         int x,
 249         int y)
 250  : BC_Radial(x,
 251         y,
 252         plugin->config.field_dominance == BOTTOM_FIELD_FIRST,
 253         _("Bottom field first"))
 254 {
 255         this->plugin = plugin;
 256         this->gui = gui;
 257 }
 258
 259 int FrameFieldBottom::handle_event()
 260 {
 261         plugin->config.field_dominance = BOTTOM_FIELD_FIRST;
 262         gui->top->update(0);
 263         plugin->send_configure_change();
 264         return 1;
 265 }
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289 FrameField::FrameField(PluginServer *server)
 290  : PluginVClient(server)
 291 {
 292
 293         field_number = 0;
 294         src_frame = 0;
 295         src_frame_number = -1;
 296         last_frame = -1;
 297         src_texture = 0;
 298         aggregate_rgb601 = 0;
 299         rgb601_direction = 0;
 300 }
 301
 302
 303 FrameField::~FrameField()
 304 {
 305
 306
 307         if(src_frame) delete src_frame;
 308         if(src_texture) delete src_texture;
 309 }
 310
 311
 312 // 0 - current frame field 0, prev frame field 1
 313 // 1 - current frame field 0, current frame field 1, copy current to prev
 314 // 2 - current frame field 0, prev frame field 1
 315
 316 int FrameField::process_buffer(VFrame *frame,
 317         int64_t start_position,
 318         double frame_rate)
 319 {
 320         load_configuration();
 321
 322         new_frame = 0;
 323
 324 // Calculate current field based on absolute position so the algorithm isn't
 325 // relative to where playback started.
 326         field_number = get_source_position() % 2;
 327
 328         if (get_direction() == PLAY_REVERSE)
 329         {
 330                 start_position++;
 331                 field_number = (field_number + 1) % 2;
 332         }
 333
 334
 335         current_frame_number = start_position / 2;
 336
 337         VFrame *ptr = frame;
 338         if(get_use_opengl())
 339         {
 340 // Read new frames directly into output frame for hardware
 341         }
 342         else
 343         {
 344 // Read into temporary for software
 345                 if(src_frame &&
 346                         src_frame->get_color_model() != frame->get_color_model())
 347                 {
 348                         delete src_frame;
 349                         src_frame = 0;
 350                 }
 351
 352                 if(!src_frame)
 353                 {
 354                         src_frame = new VFrame(0,
 355                                 -1,
 356                                 frame->get_w(),
 357                                 frame->get_h(),
 358                                 frame->get_color_model(),
 359                                 -1);
 360                 }
 361                 ptr = src_frame;
 362         }
 363
 364
 365 // Import source frame at half frame rate
 366         if(current_frame_number != src_frame_number ||
 367 // If same frame was requested, assume it was a configuration change and reprocess.
 368                 start_position == last_frame)
 369         {
 370                 read_frame(ptr,
 371                         0,
 372                         current_frame_number,
 373                         frame_rate / 2,
 374                         get_use_opengl());
 375                 src_frame_number = current_frame_number;
 376                 new_frame = 1;
 377         }
 378
 379
 380         if(get_use_opengl())
 381         {
 382                 run_opengl();
 383                 return 0;
 384         }
 385
 386         int row_size = VFrame::calculate_bytes_per_pixel(frame->get_color_model()) *
 387                 frame->get_w();
 388
 389         unsigned char **src_rows = src_frame->get_rows();
 390         unsigned char **output_rows = frame->get_rows();
 391
 392
 393 // Even field
 394         if(field_number == 0)
 395         {
 396                 if(config.field_dominance == TOP_FIELD_FIRST)
 397                 {
 398                         for(int i = 0; i < frame->get_h() - 1; i += 2)
 399                         {
 400 // Copy even lines of src to both lines of output
 401                                 memcpy(output_rows[i],
 402                                         src_rows[i],
 403                                         row_size);
 404                         }
 405
 406 // Average empty rows
 407                         /* if(config.avg) */ average_rows(0, frame);
 408                 }
 409                 else
 410                 {
 411                         for(int i = 0; i < frame->get_h() - 1; i += 2)
 412                         {
 413 // Copy odd lines of current to both lines of output with shift up.
 414                                 memcpy(output_rows[i + 1],
 415                                         src_rows[i + 1],
 416                                         row_size);
 417                         }
 418
 419 // Average empty rows
 420                         /* if(config.avg) */ average_rows(1, frame);
 421                 }
 422         }
 423         else
 424 // Odd field
 425         {
 426                 if(config.field_dominance == TOP_FIELD_FIRST)
 427                 {
 428                         for(int i = 0; i < frame->get_h() - 1; i += 2)
 429                         {
 430 // Copy odd lines of src to both lines of output
 431                                 memcpy(output_rows[i + 1],
 432                                         src_rows[i + 1],
 433                                         row_size);
 434                         }
 435
 436 // Average empty rows
 437                         /* if(config.avg) */ average_rows(1, frame);
 438                 }
 439                 else
 440                 {
 441                         for(int i = 0; i < frame->get_h() - 1; i += 2)
 442                         {
 443 // Copy even lines of src to both lines of output.
 444                                 memcpy(output_rows[i],
 445                                         src_rows[i],
 446                                         row_size);
 447                         }
 448
 449 // Average empty rows
 450                         /* if(config.avg) */ average_rows(0, frame);
 451                 }
 452         }
 453
 454         last_frame = start_position;
 455         return 0;
 456 }
 457
 458
 459 // Averaging 2 pixels
 460 #define AVERAGE(type, temp_type, components, offset) \
 461 { \
 462         type **rows = (type**)frame->get_rows(); \
 463         int w = frame->get_w(); \
 464         int h = frame->get_h(); \
 465         int row_size = components * w; \
 466         for(int i = offset; i < h - 3; i += 2) \
 467         { \
 468                 type *row1 = rows[i]; \
 469                 type *row2 = rows[i + 1]; \
 470                 type *row3 = rows[i + 2]; \
 471                 for(int j = 0; j < row_size; j++) \
 472                 { \
 473                         temp_type sum = (temp_type)*row1++ + (temp_type)*row3++; \
 474                         *row2++ = (sum / 2); \
 475                 } \
 476         } \
 477 }
 478
 479 // Averaging 6 pixels
 480 #define AVERAGE_BAK(type, components, offset) \
 481 { \
 482         type **rows = (type**)frame->get_rows(); \
 483         int w = frame->get_w(); \
 484         int h = frame->get_h(); \
 485         int row_size = w; \
 486         for(int i = offset; i < h - 3; i += 2) \
 487         { \
 488                 type *row1 = rows[i]; \
 489                 type *row2 = rows[i + 1]; \
 490                 type *row3 = rows[i + 2]; \
 491                 int64_t sum; \
 492                 int64_t pixel1[4], pixel2[4], pixel3[4]; \
 493                 int64_t pixel4[4], pixel5[4], pixel6[4]; \
 494  \
 495 /* First pixel */ \
 496                 for(int j = 0; j < components; j++) \
 497                 { \
 498                         pixel1[j] = *row1++; \
 499                         pixel4[j] = *row3++; \
 500                         *row2++ = (pixel1[j] + pixel4[j]) >> 1; \
 501                 } \
 502  \
 503                 for(int j = 2; j < row_size; j++) \
 504                 { \
 505                         for(int k = 0; k < components; k++) \
 506                         { \
 507                                 pixel2[k] = *row1++; \
 508                                 pixel5[k] = *row3++; \
 509                         } \
 510  \
 511                         for(int k = 0; k < components; k++) \
 512                         { \
 513                                 pixel3[k] = *row1; \
 514                                 pixel6[k] = *row3; \
 515                                 *row2++ = (pixel1[k] + \
 516                                         pixel2[k] + \
 517                                         pixel3[k] + \
 518                                         pixel4[k] + \
 519                                         pixel5[k] + \
 520                                         pixel6[k]) / 6; \
 521                                 pixel1[k] = pixel2[k]; \
 522                                 pixel4[k] = pixel5[k]; \
 523                         } \
 524                 } \
 525  \
 526 /* Last pixel */ \
 527                 for(int j = 0; j < components; j++) \
 528                 { \
 529                         *row2++ = (pixel3[j] + pixel6[j]) >> 1; \
 530                 } \
 531         } \
 532 }
 533
 534 void FrameField::average_rows(int offset, VFrame *frame)
 535 {
 536 //printf("FrameField::average_rows 1 %d\n", offset);
 537         switch(frame->get_color_model())
 538         {
 539                 case BC_RGB888:
 540                 case BC_YUV888:
 541                         AVERAGE(unsigned char, int64_t, 3, offset);
 542                         break;
 543                 case BC_RGB_FLOAT:
 544                         AVERAGE(float, float, 3, offset);
 545                         break;
 546                 case BC_RGBA8888:
 547                 case BC_YUVA8888:
 548                         AVERAGE(unsigned char, int64_t, 4, offset);
 549                         break;
 550                 case BC_RGBA_FLOAT:
 551                         AVERAGE(float, float, 4, offset);
 552                         break;
 553                 case BC_RGB161616:
 554                 case BC_YUV161616:
 555                         AVERAGE(uint16_t, int64_t, 3, offset);
 556                         break;
 557                 case BC_RGBA16161616:
 558                 case BC_YUVA16161616:
 559                         AVERAGE(uint16_t, int64_t, 4, offset);
 560                         break;
 561         }
 562 }
 563
 564
 565
 566 const char* FrameField::plugin_title() { return _("Frames to fields"); }
 567 int FrameField::is_realtime() { return 1; }
 568
 569 NEW_WINDOW_MACRO(FrameField, FrameFieldWindow)
 570
 571 int FrameField::load_configuration()
 572 {
 573         KeyFrame *prev_keyframe;
 574         FrameFieldConfig old_config = config;
 575
 576         prev_keyframe = get_prev_keyframe(get_source_position());
 577         read_data(prev_keyframe);
 578
 579         return !old_config.equivalent(config);
 580 }
 581
 582
 583 void FrameField::save_data(KeyFrame *keyframe)
 584 {
 585         FileXML output;
 586
 587 // cause data to be stored directly in text
 588         output.set_shared_output(keyframe->get_data(), MESSAGESIZE);
 589         output.tag.set_title("FRAME_FIELD");
 590         output.tag.set_property("DOMINANCE", config.field_dominance);
 591         output.append_tag();
 592         output.tag.set_title("/FRAME_FIELD");
 593         output.append_tag();
 594         output.append_newline();
 595         output.terminate_string();
 596 }
 597
 598 void FrameField::read_data(KeyFrame *keyframe)
 599 {
 600         FileXML input;
 601
 602         input.set_shared_input(keyframe->get_data(), strlen(keyframe->get_data()));
 603
 604         while(!input.read_tag())
 605         {
 606                 if(input.tag.title_is("FRAME_FIELD"))
 607                 {
 608                         config.field_dominance = input.tag.get_property("DOMINANCE", config.field_dominance);
 609                 }
 610         }
 611 }
 612
 613 void FrameField::update_gui()
 614 {
 615         if(thread)
 616         {
 617                 if(load_configuration())
 618                 {
 619                         thread->window->lock_window();
 620                         ((FrameFieldWindow*)thread->window)->top->update(config.field_dominance == TOP_FIELD_FIRST);
 621                         ((FrameFieldWindow*)thread->window)->bottom->update(config.field_dominance == BOTTOM_FIELD_FIRST);
 622                         thread->window->unlock_window();
 623                 }
 624         }
 625 }
 626
 627 int FrameField::handle_opengl()
 628 {
 629 #ifdef HAVE_GL
 630         static const char *field_frag =
 631                 "uniform sampler2D tex;\n"
 632                 "uniform float double_line_h;\n"
 633                 "uniform float y_offset;\n"
 634                 "void main()\n"
 635                 "{\n"
 636                 "       vec2 coord = gl_TexCoord[0].st;\n"
 637 /* Number of double lines + fraction of current double line */
 638                 "       float half_y = (coord.y - y_offset) / double_line_h;\n"
 639 /* Lines comprising current double line */
 640                 "       float line1 = floor(half_y) * double_line_h + y_offset;\n"
 641                 "       float line2 = line1 + double_line_h;\n"
 642 /* Distance from line1 to line2 */
 643                 "       float frac = fract(half_y);\n"
 644                 "       gl_FragColor =  mix(\n"
 645                 "               texture2D(tex, vec2(coord.x, line1)), \n"
 646                 "               texture2D(tex, vec2(coord.x, line2)), \n"
 647                 "               frac);\n"
 648                 "}\n";
 649
 650         static const char *_601_to_rgb_frag =
 651                 "void main()\n"
 652                 "{\n"
 653                 "       gl_FragColor.rgb = gl_FragColor.rgb * vec3(1.1644, 1.1644, 1.1644) - vec3(0.0627, 0.0627, 0.0627);\n"
 654                 "}\n";
 655
 656         static const char *_601_to_yuv_frag =
 657                 "void main()\n"
 658                 "{\n"
 659                 "       gl_FragColor.r = gl_FragColor.r * 1.1644 - 0.0627;\n"
 660                 "}\n";
 661
 662         static const char *rgb_to_601_frag =
 663                 "void main()\n"
 664                 "{\n"
 665                 "       gl_FragColor.rgb = gl_FragColor.rgb * vec3(0.8588, 0.8588, 0.8588) + vec3(0.0627, 0.0627, 0.0627);\n"
 666                 "}\n";
 667
 668         static const char *yuv_to_601_frag =
 669                 "void main()\n"
 670                 "{\n"
 671                 "       gl_FragColor.r = gl_FragColor.r * 0.8588 + 0.0627;\n"
 672                 "}\n";
 673
 674
 675         if(new_frame)
 676         {
 677                 if(get_output()->get_opengl_state() != VFrame::SCREEN)
 678                 {
 679 // Copy new frame to temporary texture
 680                         get_output()->to_texture();
 681
 682 // Draw it only to copy it to the temporary.
 683                         get_output()->enable_opengl();
 684                         VFrame::init_screen(get_output()->get_w(), get_output()->get_h());
 685                         get_output()->bind_texture(0);
 686                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 687                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 688                         get_output()->draw_texture();
 689                 }
 690
 691                 get_output()->enable_opengl();
 692                 VFrame::init_screen(get_output()->get_w(), get_output()->get_h());
 693                 glActiveTexture(GL_TEXTURE0);
 694                 BC_Texture::new_texture(&src_texture,
 695                         get_output()->get_w(),
 696                         get_output()->get_h(),
 697                         get_output()->get_color_model());
 698                 src_texture->bind(0);
 699                 glCopyTexSubImage2D(GL_TEXTURE_2D,
 700                         0,
 701                         0,
 702                         0,
 703                         0,
 704                         0,
 705                         get_output()->get_w(),
 706                         get_output()->get_h());
 707
 708 // Store aggregation state only when reading a frame
 709 //printf("FrameField::handle_opengl %p\n", get_output());
 710 //get_output()->dump_stacks();
 711                 if(prev_effect_is(_("RGB - 601")) ||
 712                         next_effect_is(_("RGB - 601")))
 713                 {
 714                         aggregate_rgb601 = 1;
 715                         rgb601_direction = get_output()->get_params()->get("RGB601_DIRECTION", 0);
 716                 }
 717                 else
 718                         aggregate_rgb601 = 0;
 719         }
 720         else
 721         {
 722                 get_output()->enable_opengl();
 723         }
 724
 725         unsigned int frag = 0;
 726         float y_offset = 0.0;
 727         if(field_number == 0)
 728         {
 729                 if(config.field_dominance == BOTTOM_FIELD_FIRST)
 730                         y_offset = 1.0;
 731         }
 732         else
 733         {
 734                 if(config.field_dominance == TOP_FIELD_FIRST)
 735                         y_offset = 1.0;
 736         }
 737
 738         VFrame::init_screen(get_output()->get_w(), get_output()->get_h());
 739         glActiveTexture(GL_TEXTURE0);
 740         BC_Texture::new_texture(&src_texture,
 741                 get_output()->get_w(),
 742                 get_output()->get_h(),
 743                 get_output()->get_color_model());
 744
 745
 746         const char *shaders[3] = { 0, 0, 0 };
 747         shaders[0] = field_frag;
 748
 749
 750 // Aggregate with other effect
 751 //printf("FrameField::handle_opengl %s\n", get_output()->get_next_effect());
 752         if(aggregate_rgb601)
 753         {
 754                 if(rgb601_direction == 1)
 755                 {
 756                         if(BC_CModels::is_yuv(get_output()->get_color_model()))
 757                                 shaders[1] = yuv_to_601_frag;
 758                         else
 759                                 shaders[1] = rgb_to_601_frag;
 760                 }
 761                 else
 762                 if(rgb601_direction == 2)
 763                 {
 764                         if(BC_CModels::is_yuv(get_output()->get_color_model()))
 765                                 shaders[1] = _601_to_yuv_frag;
 766                         else
 767                                 shaders[1] = _601_to_rgb_frag;
 768                 }
 769         }
 770
 771
 772
 773         frag = VFrame::make_shader(0, shaders[0], shaders[1], shaders[2], 0);
 774
 775
 776         if(frag)
 777         {
 778                 glUseProgram(frag);
 779                 glUniform1i(glGetUniformLocation(frag, "tex"), 0);
 780                 glUniform1f(glGetUniformLocation(frag, "double_line_h"),
 781                         2.0 / src_texture->get_texture_h());
 782                 glUniform1f(glGetUniformLocation(frag, "y_offset"),
 783                         y_offset / src_texture->get_texture_h());
 784         }
 785
 786
 787
 788         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 789         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 790         get_output()->draw_texture();
 791
 792         glUseProgram(0);
 793         get_output()->set_opengl_state(VFrame::SCREEN);
 794
 795 // Reset for other operations
 796         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 797         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 798
 799 #endif
 800         return 0;
 801 }
 802
 803