git.sesse.net Git - casparcg/blob - accelerator/ogl/image/image_shader.cpp

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG 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 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG 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 CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../../StdAfx.h"
  23
  24 #include "image_shader.h"
  25
  26 #include "../util/shader.h"
  27 #include "../util/device.h"
  28
  29 #include "blending_glsl.h"
  30
  31 #include <common/gl/gl_check.h>
  32 #include <common/env.h>
  33
  34 #include <tbb/mutex.h>
  35
  36 namespace caspar { namespace accelerator { namespace ogl {
  37
  38 std::weak_ptr<shader>   g_shader;
  39 tbb::mutex                              g_shader_mutex;
  40 bool                                    g_blend_modes           = false;
  41 bool                                    g_post_processing       = false;
  42
  43 std::string get_blend_color_func()
  44 {
  45         return
  46
  47                 get_adjustement_glsl()
  48
  49                 +
  50
  51                 get_blend_glsl()
  52
  53                 +
  54
  55                 R"shader(
  56                                 vec3 get_blend_color(vec3 back, vec3 fore)
  57                                 {
  58                                         switch(blend_mode)
  59                                         {
  60                                         case  0: return BlendNormal(back, fore);
  61                                         case  1: return BlendLighten(back, fore);
  62                                         case  2: return BlendDarken(back, fore);
  63                                         case  3: return BlendMultiply(back, fore);
  64                                         case  4: return BlendAverage(back, fore);
  65                                         case  5: return BlendAdd(back, fore);
  66                                         case  6: return BlendSubstract(back, fore);
  67                                         case  7: return BlendDifference(back, fore);
  68                                         case  8: return BlendNegation(back, fore);
  69                                         case  9: return BlendExclusion(back, fore);
  70                                         case 10: return BlendScreen(back, fore);
  71                                         case 11: return BlendOverlay(back, fore);
  72                                 //      case 12: return BlendSoftLight(back, fore);
  73                                         case 13: return BlendHardLight(back, fore);
  74                                         case 14: return BlendColorDodge(back, fore);
  75                                         case 15: return BlendColorBurn(back, fore);
  76                                         case 16: return BlendLinearDodge(back, fore);
  77                                         case 17: return BlendLinearBurn(back, fore);
  78                                         case 18: return BlendLinearLight(back, fore);
  79                                         case 19: return BlendVividLight(back, fore);
  80                                         case 20: return BlendPinLight(back, fore);
  81                                         case 21: return BlendHardMix(back, fore);
  82                                         case 22: return BlendReflect(back, fore);
  83                                         case 23: return BlendGlow(back, fore);
  84                                         case 24: return BlendPhoenix(back, fore);
  85                                         case 25: return BlendHue(back, fore);
  86                                         case 26: return BlendSaturation(back, fore);
  87                                         case 27: return BlendColor(back, fore);
  88                                         case 28: return BlendLuminosity(back, fore);
  89                                         }
  90                                         return BlendNormal(back, fore);
  91                                 }
  92
  93                                 vec4 blend(vec4 fore)
  94                                 {
  95                                    vec4 back = texture2D(background, gl_TexCoord[1].st).bgra;
  96                                    if(blend_mode != 0)
  97                                                 fore.rgb = get_blend_color(back.rgb/(back.a+0.0000001), fore.rgb/(fore.a+0.0000001))*fore.a;
  98                                         switch(keyer)
  99                                         {
 100                                                 case 1:  return fore + back; // additive
 101                                                 default: return fore + (1.0-fore.a)*back; // linear
 102                                         }
 103                                 }
 104                 )shader";
 105 }
 106
 107 std::string get_simple_blend_color_func()
 108 {
 109         return
 110
 111                 get_adjustement_glsl()
 112
 113                 +
 114
 115                 R"shader(
 116                                 vec4 blend(vec4 fore)
 117                                 {
 118                                         return fore;
 119                                 }
 120                 )shader";
 121 }
 122
 123 std::string get_chroma_func()
 124 {
 125         return
 126
 127                 get_chroma_glsl()
 128
 129                 +
 130
 131                 R"shader(
 132                                 vec4 chroma_key(vec4 c)
 133                                 {
 134                                         switch (chroma_mode)
 135                                         {
 136                                         case 0: return c;
 137                                         case 1: return ChromaOnGreen(c.bgra).bgra;
 138                                         case 2: return ChromaOnBlue(c.bgra).bgra;
 139                                         }
 140
 141                                         return c;
 142                                 }
 143                 )shader";
 144 }
 145
 146 std::string get_post_process()
 147 {
 148         return R"shader(
 149                 if (post_processing)
 150                 {
 151                         gl_FragColor = post_process().bgra;
 152                 }
 153                 else
 154         )shader";
 155 }
 156
 157 std::string get_no_post_process()
 158 {
 159         return "";
 160 }
 161
 162 std::string get_vertex()
 163 {
 164         return R"shader(
 165                         void main()
 166                         {
 167                                 gl_TexCoord[0] = gl_MultiTexCoord0;
 168                         //      gl_TexCoord[1] = gl_MultiTexCoord1;
 169                                 vec4 pos = ftransform();
 170                                 gl_TexCoord[1] = vec4(pos.xy, 0.0, 0.0);
 171                                 pos.x = pos.x*2.0 - 1.0;
 172                                 pos.y = pos.y*2.0 - 1.0;
 173                                 gl_Position    = pos;
 174                         }
 175         )shader";
 176 }
 177
 178 std::string get_fragment(bool blend_modes, bool post_processing)
 179 {
 180         return R"shader(
 181
 182                         #version 130
 183                         uniform sampler2D       background;
 184                         uniform sampler2D       plane[4];
 185                         uniform vec2            plane_size[4];
 186                         uniform sampler2D       local_key;
 187                         uniform sampler2D       layer_key;
 188
 189                         uniform bool            is_hd;
 190                         uniform bool            has_local_key;
 191                         uniform bool            has_layer_key;
 192                         uniform int                     blend_mode;
 193                         uniform int                     keyer;
 194                         uniform int                     pixel_format;
 195                         uniform int                     deinterlace;
 196
 197                         uniform float           opacity;
 198                         uniform bool            levels;
 199                         uniform float           min_input;
 200                         uniform float           max_input;
 201                         uniform float           gamma;
 202                         uniform float           min_output;
 203                         uniform float           max_output;
 204
 205                         uniform bool            csb;
 206                         uniform float           brt;
 207                         uniform float           sat;
 208                         uniform float           con;
 209
 210                         uniform bool            post_processing;
 211                         uniform bool            straighten_alpha;
 212
 213                         uniform bool            chroma;
 214                         uniform int                     chroma_mode;
 215                         uniform vec2            chroma_blend;
 216                         uniform float           chroma_spill;
 217         )shader"
 218
 219         +
 220
 221         (blend_modes ? get_blend_color_func() : get_simple_blend_color_func())
 222
 223         +
 224
 225         get_chroma_func()
 226
 227         +
 228
 229         R"shader(
 230
 231                         vec4 ycbcra_to_rgba_sd(float Y, float Cb, float Cr, float A)
 232                         {
 233                                 vec4 rgba;
 234                                 rgba.b = (1.164*(Y*255 - 16) + 1.596*(Cr*255 - 128))/255;
 235                                 rgba.g = (1.164*(Y*255 - 16) - 0.813*(Cr*255 - 128) - 0.391*(Cb*255 - 128))/255;
 236                                 rgba.r = (1.164*(Y*255 - 16) + 2.018*(Cb*255 - 128))/255;
 237                                 rgba.a = A;
 238                                 return rgba;
 239                         }
 240
 241                         vec4 ycbcra_to_rgba_hd(float Y, float Cb, float Cr, float A)
 242                         {
 243                                 vec4 rgba;
 244                                 rgba.b = (1.164*(Y*255 - 16) + 1.793*(Cr*255 - 128))/255;
 245                                 rgba.g = (1.164*(Y*255 - 16) - 0.534*(Cr*255 - 128) - 0.213*(Cb*255 - 128))/255;
 246                                 rgba.r = (1.164*(Y*255 - 16) + 2.115*(Cb*255 - 128))/255;
 247                                 rgba.a = A;
 248                                 return rgba;
 249                         }
 250
 251                         vec4 ycbcra_to_rgba(float y, float cb, float cr, float a)
 252                         {
 253                                 if(is_hd)
 254                                         return ycbcra_to_rgba_hd(y, cb, cr, a);
 255                                 else
 256                                         return ycbcra_to_rgba_sd(y, cb, cr, a);
 257                         }
 258
 259                         vec4 get_sample(sampler2D sampler, vec2 coords, vec2 size)
 260                         {
 261                                 switch(deinterlace)
 262                                 {
 263                                 case 1: // upper
 264                                         return texture2D(sampler, coords);
 265                                 case 2: // lower
 266                                         return texture2D(sampler, coords);
 267                                 default:
 268                                         return texture2D(sampler, coords);
 269                                 }
 270                         }
 271
 272                         vec4 get_rgba_color()
 273                         {
 274                                 switch(pixel_format)
 275                                 {
 276                                 case 0:         //gray
 277                                         return vec4(get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).rrr, 1.0);
 278                                 case 1:         //bgra,
 279                                         return get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).bgra;
 280                                 case 2:         //rgba,
 281                                         return get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).rgba;
 282                                 case 3:         //argb,
 283                                         return get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).argb;
 284                                 case 4:         //abgr,
 285                                         return get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).gbar;
 286                                 case 5:         //ycbcr,
 287                                         {
 288                                                 float y  = get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).r;
 289                                                 float cb = get_sample(plane[1], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).r;
 290                                                 float cr = get_sample(plane[2], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).r;
 291                                                 return ycbcra_to_rgba(y, cb, cr, 1.0);
 292                                         }
 293                                 case 6:         //ycbcra
 294                                         {
 295                                                 float y  = get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).r;
 296                                                 float cb = get_sample(plane[1], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).r;
 297                                                 float cr = get_sample(plane[2], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).r;
 298                                                 float a  = get_sample(plane[3], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).r;
 299                                                 return ycbcra_to_rgba(y, cb, cr, a);
 300                                         }
 301                                 case 7:         //luma
 302                                         {
 303                                                 vec3 y3 = get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).rrr;
 304                                                 return vec4((y3-0.065)/0.859, 1.0);
 305                                         }
 306                                 case 8:         //bgr,
 307                                         return vec4(get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).bgr, 1.0);
 308                                 case 9:         //rgb,
 309                                         return vec4(get_sample(plane[0], gl_TexCoord[0].st / gl_TexCoord[0].q, plane_size[0]).rgb, 1.0);
 310                                 }
 311                                 return vec4(0.0, 0.0, 0.0, 0.0);
 312                         }
 313
 314                         vec4 post_process()
 315                         {
 316                                 vec4 color = texture2D(background, gl_TexCoord[0].st).bgra;
 317
 318                                 if (straighten_alpha)
 319                                         color.rgb /= color.a + 0.0000001;
 320
 321                                 return color;
 322                         }
 323
 324                         void main()
 325                         {
 326         )shader"
 327
 328         +
 329
 330         (post_processing ? get_post_process() : get_no_post_process())
 331
 332         +
 333
 334         R"shader(
 335                                 {
 336                                         vec4 color = get_rgba_color();
 337                                         if (chroma)
 338                                                 color = chroma_key(color);
 339                                         if(levels)
 340                                                 color.rgb = LevelsControl(color.rgb, min_input, gamma, max_input, min_output, max_output);
 341                                         if(csb)
 342                                                 color.rgb = ContrastSaturationBrightness(color.rgb, brt, sat, con);
 343                                         if(has_local_key)
 344                                                 color *= texture2D(local_key, gl_TexCoord[1].st).r;
 345                                         if(has_layer_key)
 346                                                 color *= texture2D(layer_key, gl_TexCoord[1].st).r;
 347                                         color *= opacity;
 348                                         color = blend(color);
 349                                         gl_FragColor = color.bgra;
 350                                 }
 351                         }
 352         )shader";
 353 }
 354
 355 std::shared_ptr<shader> get_image_shader(
 356                 const spl::shared_ptr<device>& ogl,
 357                 bool& blend_modes,
 358                 bool blend_modes_wanted,
 359                 bool& post_processing,
 360                 bool straight_alpha_wanted)
 361 {
 362         tbb::mutex::scoped_lock lock(g_shader_mutex);
 363         auto existing_shader = g_shader.lock();
 364
 365         if(existing_shader)
 366         {
 367                 blend_modes = g_blend_modes;
 368                 post_processing = g_post_processing;
 369                 return existing_shader;
 370         }
 371
 372         // The deleter is alive until the weak pointer is destroyed, so we have
 373         // to weakly reference ogl, to not keep it alive until atexit
 374         std::weak_ptr<device> weak_ogl = ogl;
 375
 376         auto deleter = [weak_ogl](shader* p)
 377         {
 378                 auto ogl = weak_ogl.lock();
 379
 380                 if (ogl)
 381                         ogl->invoke([=]
 382                         {
 383                                 delete p;
 384                         });
 385         };
 386
 387         try
 388         {
 389                 g_blend_modes  = glTextureBarrierNV ? blend_modes_wanted : false;
 390                 g_post_processing = straight_alpha_wanted;
 391                 existing_shader.reset(new shader(get_vertex(), get_fragment(g_blend_modes, g_post_processing)), deleter);
 392         }
 393         catch(...)
 394         {
 395                 CASPAR_LOG_CURRENT_EXCEPTION();
 396                 CASPAR_LOG(warning) << "Failed to compile shader. Trying to compile without blend-modes.";
 397
 398                 g_blend_modes = false;
 399                 existing_shader.reset(new shader(get_vertex(), get_fragment(g_blend_modes, g_post_processing)), deleter);
 400         }
 401
 402         //if(!g_blend_modes)
 403         //{
 404         //      ogl.blend_func(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
 405         //      CASPAR_LOG(info) << L"[shader] Blend-modes are disabled.";
 406         //}
 407
 408
 409         blend_modes = g_blend_modes;
 410         post_processing = g_post_processing;
 411         g_shader = existing_shader;
 412         return existing_shader;
 413 }
 414
 415 }}}