src/cc/output/shader.cc

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/output/shader.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/basictypes.h"
  10 #include "base/logging.h"
  11 #include "cc/output/gl_renderer.h"  // For the GLC() macro.
  12 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
  13 #include "third_party/khronos/GLES2/gl2.h"
  14
  15 #define SHADER0(Src) #Src
  16 #define VERTEX_SHADER(Src) SetVertexTexCoordPrecision(SHADER0(Src))
  17 #define FRAGMENT_SHADER(Src) SetFragTexCoordPrecision(precision, SHADER0(Src))
  18
  19 using WebKit::WebGraphicsContext3D;
  20
  21 namespace cc {
  22
  23 namespace {
  24
  25 static void GetProgramUniformLocations(WebGraphicsContext3D* context,
  26                                        unsigned program,
  27                                        size_t count,
  28                                        const char** uniforms,
  29                                        int* locations,
  30                                        bool using_bind_uniform,
  31                                        int* base_uniform_index) {
  32   for (size_t i = 0; i < count; i++) {
  33     if (using_bind_uniform) {
  34       locations[i] = (*base_uniform_index)++;
  35       context->bindUniformLocationCHROMIUM(program, locations[i], uniforms[i]);
  36     } else {
  37       locations[i] = context->getUniformLocation(program, uniforms[i]);
  38       DCHECK_NE(locations[i], -1);
  39     }
  40   }
  41 }
  42
  43 static std::string SetFragTexCoordPrecision(
  44     TexCoordPrecision requested_precision, std::string shader_string) {
  45   switch (requested_precision) {
  46     case TexCoordPrecisionHigh:
  47       DCHECK_NE(shader_string.find("TexCoordPrecision"), std::string::npos);
  48       return
  49           "#ifdef GL_FRAGMENT_PRECISION_HIGH\n"
  50           "  #define TexCoordPrecision highp\n"
  51           "#else\n"
  52           "  #define TexCoordPrecision mediump\n"
  53           "#endif\n" +
  54           shader_string;
  55     case TexCoordPrecisionMedium:
  56       DCHECK_NE(shader_string.find("TexCoordPrecision"), std::string::npos);
  57       return "#define TexCoordPrecision mediump\n" +
  58           shader_string;
  59     case TexCoordPrecisionNA:
  60       DCHECK_EQ(shader_string.find("TexCoordPrecision"), std::string::npos);
  61       DCHECK_EQ(shader_string.find("texture2D"), std::string::npos);
  62       return shader_string;
  63   }
  64   return shader_string;
  65 }
  66
  67 static std::string SetVertexTexCoordPrecision(const char* shader_string) {
  68   // We unconditionally use highp in the vertex shader since
  69   // we are unlikely to be vertex shader bound when drawing large quads.
  70   // Also, some vertex shaders mutate the texture coordinate in such a
  71   // way that the effective precision might be lower than expected.
  72   return "#define TexCoordPrecision highp\n" +
  73       std::string(shader_string);
  74 }
  75
  76 TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
  77                                             int *highp_threshold_cache,
  78                                             int highp_threshold_min,
  79                                             int x, int y) {
  80   if (*highp_threshold_cache == 0) {
  81     // Initialize range and precision with minimum spec values for when
  82     // GetShaderPrecisionFormat is a test stub.
  83     // TODO(brianderson): Implement better stubs of GetShaderPrecisionFormat
  84     // everywhere.
  85     GLint range[2] = { 14, 14 };
  86     GLint precision = 10;
  87     GLC(context, context->getShaderPrecisionFormat(GL_FRAGMENT_SHADER,
  88                                                    GL_MEDIUM_FLOAT,
  89                                                    range, &precision));
  90     *highp_threshold_cache = 1 << precision;
  91   }
  92
  93   int highp_threshold = std::max(*highp_threshold_cache, highp_threshold_min);
  94   if (x > highp_threshold || y > highp_threshold)
  95     return TexCoordPrecisionHigh;
  96   return TexCoordPrecisionMedium;
  97 }
  98
  99 }  // namespace
 100
 101 TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
 102                                             int *highp_threshold_cache,
 103                                             int highp_threshold_min,
 104                                             gfx::Point max_coordinate) {
 105   return TexCoordPrecisionRequired(context,
 106                                    highp_threshold_cache, highp_threshold_min,
 107                                    max_coordinate.x(), max_coordinate.y());
 108 }
 109
 110 TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
 111                                             int *highp_threshold_cache,
 112                                             int highp_threshold_min,
 113                                             gfx::Size max_size) {
 114   return TexCoordPrecisionRequired(context,
 115                                    highp_threshold_cache, highp_threshold_min,
 116                                    max_size.width(), max_size.height());
 117 }
 118
 119 VertexShaderPosTex::VertexShaderPosTex()
 120       : matrix_location_(-1) {}
 121
 122 void VertexShaderPosTex::Init(WebGraphicsContext3D* context,
 123                               unsigned program,
 124                               bool using_bind_uniform,
 125                               int* base_uniform_index) {
 126   static const char* uniforms[] = {
 127       "matrix",
 128   };
 129   int locations[arraysize(uniforms)];
 130
 131   GetProgramUniformLocations(context,
 132                              program,
 133                              arraysize(uniforms),
 134                              uniforms,
 135                              locations,
 136                              using_bind_uniform,
 137                              base_uniform_index);
 138   matrix_location_ = locations[0];
 139 }
 140
 141 std::string VertexShaderPosTex::GetShaderString() const {
 142   return VERTEX_SHADER(
 143     attribute vec4 a_position;
 144     attribute TexCoordPrecision vec2 a_texCoord;
 145     uniform mat4 matrix;
 146     varying TexCoordPrecision vec2 v_texCoord;
 147     void main() {
 148       gl_Position = matrix * a_position;
 149       v_texCoord = a_texCoord;
 150     }
 151   );  // NOLINT(whitespace/parens)
 152 }
 153
 154 VertexShaderPosTexYUVStretch::VertexShaderPosTexYUVStretch()
 155     : matrix_location_(-1),
 156       tex_scale_location_(-1) {}
 157
 158 void VertexShaderPosTexYUVStretch::Init(WebGraphicsContext3D* context,
 159                                         unsigned program,
 160                                         bool using_bind_uniform,
 161                                         int* base_uniform_index) {
 162   static const char* uniforms[] = {
 163     "matrix",
 164     "texScale",
 165   };
 166   int locations[arraysize(uniforms)];
 167
 168   GetProgramUniformLocations(context,
 169                              program,
 170                              arraysize(uniforms),
 171                              uniforms,
 172                              locations,
 173                              using_bind_uniform,
 174                              base_uniform_index);
 175   matrix_location_ = locations[0];
 176   tex_scale_location_ = locations[1];
 177 }
 178
 179 std::string VertexShaderPosTexYUVStretch::GetShaderString() const {
 180   return VERTEX_SHADER(
 181     precision mediump float;
 182     attribute vec4 a_position;
 183     attribute TexCoordPrecision vec2 a_texCoord;
 184     uniform mat4 matrix;
 185     varying TexCoordPrecision vec2 v_texCoord;
 186     uniform TexCoordPrecision vec2 texScale;
 187     void main() {
 188         gl_Position = matrix * a_position;
 189         v_texCoord = a_texCoord * texScale;
 190     }
 191   );  // NOLINT(whitespace/parens)
 192 }
 193
 194 VertexShaderPos::VertexShaderPos()
 195     : matrix_location_(-1) {}
 196
 197 void VertexShaderPos::Init(WebGraphicsContext3D* context,
 198                            unsigned program,
 199                            bool using_bind_uniform,
 200                            int* base_uniform_index) {
 201   static const char* uniforms[] = {
 202       "matrix",
 203   };
 204   int locations[arraysize(uniforms)];
 205
 206   GetProgramUniformLocations(context,
 207                              program,
 208                              arraysize(uniforms),
 209                              uniforms,
 210                              locations,
 211                              using_bind_uniform,
 212                              base_uniform_index);
 213   matrix_location_ = locations[0];
 214 }
 215
 216 std::string VertexShaderPos::GetShaderString() const {
 217   return VERTEX_SHADER(
 218     attribute vec4 a_position;
 219     uniform mat4 matrix;
 220     void main() {
 221         gl_Position = matrix * a_position;
 222     }
 223   );  // NOLINT(whitespace/parens)
 224 }
 225
 226 VertexShaderPosTexTransform::VertexShaderPosTexTransform()
 227     : matrix_location_(-1),
 228       tex_transform_location_(-1),
 229       vertex_opacity_location_(-1) {}
 230
 231 void VertexShaderPosTexTransform::Init(WebGraphicsContext3D* context,
 232                                        unsigned program,
 233                                        bool using_bind_uniform,
 234                                        int* base_uniform_index) {
 235   static const char* uniforms[] = {
 236     "matrix",
 237     "texTransform",
 238     "opacity",
 239   };
 240   int locations[arraysize(uniforms)];
 241
 242   GetProgramUniformLocations(context,
 243                              program,
 244                              arraysize(uniforms),
 245                              uniforms,
 246                              locations,
 247                              using_bind_uniform,
 248                              base_uniform_index);
 249   matrix_location_ = locations[0];
 250   tex_transform_location_ = locations[1];
 251   vertex_opacity_location_ = locations[2];
 252 }
 253
 254 std::string VertexShaderPosTexTransform::GetShaderString() const {
 255   return VERTEX_SHADER(
 256     attribute vec4 a_position;
 257     attribute TexCoordPrecision vec2 a_texCoord;
 258     attribute float a_index;
 259     uniform mat4 matrix[8];
 260     uniform TexCoordPrecision vec4 texTransform[8];
 261     uniform float opacity[32];
 262     varying TexCoordPrecision vec2 v_texCoord;
 263     varying float v_alpha;
 264     void main() {
 265       int quad_index = int(a_index * 0.25);  // NOLINT
 266       gl_Position = matrix[quad_index] * a_position;
 267       TexCoordPrecision vec4 texTrans = texTransform[quad_index];
 268       v_texCoord = a_texCoord * texTrans.zw + texTrans.xy;
 269       v_alpha = opacity[int(a_index)]; // NOLINT
 270     }
 271   );  // NOLINT(whitespace/parens)
 272 }
 273
 274 std::string VertexShaderPosTexIdentity::GetShaderString() const {
 275   return VERTEX_SHADER(
 276     attribute vec4 a_position;
 277     varying TexCoordPrecision vec2 v_texCoord;
 278     void main() {
 279       gl_Position = a_position;
 280       v_texCoord = (a_position.xy + vec2(1.0)) * 0.5;
 281     }
 282   );  // NOLINT(whitespace/parens)
 283 }
 284
 285 VertexShaderQuad::VertexShaderQuad()
 286     : matrix_location_(-1),
 287       quad_location_(-1) {}
 288
 289 void VertexShaderQuad::Init(WebGraphicsContext3D* context,
 290                             unsigned program,
 291                             bool using_bind_uniform,
 292                             int* base_uniform_index) {
 293   static const char* uniforms[] = {
 294     "matrix",
 295     "quad",
 296   };
 297   int locations[arraysize(uniforms)];
 298
 299   GetProgramUniformLocations(context,
 300                              program,
 301                              arraysize(uniforms),
 302                              uniforms,
 303                              locations,
 304                              using_bind_uniform,
 305                              base_uniform_index);
 306   matrix_location_ = locations[0];
 307   quad_location_ = locations[1];
 308 }
 309
 310 std::string VertexShaderQuad::GetShaderString() const {
 311 #if defined(OS_ANDROID)
 312 // TODO(epenner): Find the cause of this 'quad' uniform
 313 // being missing if we don't add dummy variables.
 314 // http://crbug.com/240602
 315   return VERTEX_SHADER(
 316     attribute TexCoordPrecision vec4 a_position;
 317     attribute float a_index;
 318     uniform mat4 matrix;
 319     uniform TexCoordPrecision vec2 quad[4];
 320     uniform TexCoordPrecision vec2 dummy_uniform;
 321     varying TexCoordPrecision vec2 dummy_varying;
 322     void main() {
 323       vec2 pos = quad[int(a_index)];  // NOLINT
 324       gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
 325       dummy_varying = dummy_uniform;
 326     }
 327   );  // NOLINT(whitespace/parens)
 328 #else
 329   return VERTEX_SHADER(
 330     attribute TexCoordPrecision vec4 a_position;
 331     attribute float a_index;
 332     uniform mat4 matrix;
 333     uniform TexCoordPrecision vec2 quad[4];
 334     void main() {
 335       vec2 pos = quad[int(a_index)];  // NOLINT
 336       gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
 337     }
 338   );  // NOLINT(whitespace/parens)
 339 #endif
 340 }
 341
 342 VertexShaderQuadAA::VertexShaderQuadAA()
 343     : matrix_location_(-1),
 344       viewport_location_(-1),
 345       quad_location_(-1),
 346       edge_location_(-1) {}
 347
 348 void VertexShaderQuadAA::Init(WebGraphicsContext3D* context,
 349                             unsigned program,
 350                             bool using_bind_uniform,
 351                             int* base_uniform_index) {
 352   static const char* uniforms[] = {
 353     "matrix",
 354     "viewport",
 355     "quad",
 356     "edge",
 357   };
 358   int locations[arraysize(uniforms)];
 359
 360   GetProgramUniformLocations(context,
 361                              program,
 362                              arraysize(uniforms),
 363                              uniforms,
 364                              locations,
 365                              using_bind_uniform,
 366                              base_uniform_index);
 367   matrix_location_ = locations[0];
 368   viewport_location_ = locations[1];
 369   quad_location_ = locations[2];
 370   edge_location_ = locations[3];
 371 }
 372
 373 std::string VertexShaderQuadAA::GetShaderString() const {
 374   return VERTEX_SHADER(
 375     attribute TexCoordPrecision vec4 a_position;
 376     attribute float a_index;
 377     uniform mat4 matrix;
 378     uniform vec4 viewport;
 379     uniform TexCoordPrecision vec2 quad[4];
 380     uniform TexCoordPrecision vec3 edge[8];
 381     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
 382
 383     void main() {
 384       vec2 pos = quad[int(a_index)];  // NOLINT
 385       gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
 386       vec2 ndc_pos = 0.5 * (1.0 + gl_Position.xy / gl_Position.w);
 387       vec3 screen_pos = vec3(viewport.xy + viewport.zw * ndc_pos, 1.0);
 388       edge_dist[0] = vec4(dot(edge[0], screen_pos),
 389                           dot(edge[1], screen_pos),
 390                           dot(edge[2], screen_pos),
 391                           dot(edge[3], screen_pos)) * gl_Position.w;
 392       edge_dist[1] = vec4(dot(edge[4], screen_pos),
 393                           dot(edge[5], screen_pos),
 394                           dot(edge[6], screen_pos),
 395                           dot(edge[7], screen_pos)) * gl_Position.w;
 396     }
 397   );  // NOLINT(whitespace/parens)
 398 }
 399
 400 VertexShaderQuadTexTransformAA::VertexShaderQuadTexTransformAA()
 401     : matrix_location_(-1),
 402       viewport_location_(-1),
 403       quad_location_(-1),
 404       edge_location_(-1),
 405       tex_transform_location_(-1) {}
 406
 407 void VertexShaderQuadTexTransformAA::Init(WebGraphicsContext3D* context,
 408                                         unsigned program,
 409                                         bool using_bind_uniform,
 410                                         int* base_uniform_index) {
 411   static const char* uniforms[] = {
 412     "matrix",
 413     "viewport",
 414     "quad",
 415     "edge",
 416     "texTrans",
 417   };
 418   int locations[arraysize(uniforms)];
 419
 420   GetProgramUniformLocations(context,
 421                              program,
 422                              arraysize(uniforms),
 423                              uniforms,
 424                              locations,
 425                              using_bind_uniform,
 426                              base_uniform_index);
 427   matrix_location_ = locations[0];
 428   viewport_location_ = locations[1];
 429   quad_location_ = locations[2];
 430   edge_location_ = locations[3];
 431   tex_transform_location_ = locations[4];
 432 }
 433
 434 std::string VertexShaderQuadTexTransformAA::GetShaderString() const {
 435   return VERTEX_SHADER(
 436     attribute TexCoordPrecision vec4 a_position;
 437     attribute float a_index;
 438     uniform mat4 matrix;
 439     uniform vec4 viewport;
 440     uniform TexCoordPrecision vec2 quad[4];
 441     uniform TexCoordPrecision vec3 edge[8];
 442     uniform TexCoordPrecision vec4 texTrans;
 443     varying TexCoordPrecision vec2 v_texCoord;
 444     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
 445
 446     void main() {
 447       vec2 pos = quad[int(a_index)];  // NOLINT
 448       gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
 449       vec2 ndc_pos = 0.5 * (1.0 + gl_Position.xy / gl_Position.w);
 450       vec3 screen_pos = vec3(viewport.xy + viewport.zw * ndc_pos, 1.0);
 451       edge_dist[0] = vec4(dot(edge[0], screen_pos),
 452                           dot(edge[1], screen_pos),
 453                           dot(edge[2], screen_pos),
 454                           dot(edge[3], screen_pos)) * gl_Position.w;
 455       edge_dist[1] = vec4(dot(edge[4], screen_pos),
 456                           dot(edge[5], screen_pos),
 457                           dot(edge[6], screen_pos),
 458                           dot(edge[7], screen_pos)) * gl_Position.w;
 459       v_texCoord = (pos.xy + vec2(0.5)) * texTrans.zw + texTrans.xy;
 460     }
 461   );  // NOLINT(whitespace/parens)
 462 }
 463
 464 VertexShaderTile::VertexShaderTile()
 465     : matrix_location_(-1),
 466       quad_location_(-1),
 467       vertex_tex_transform_location_(-1) {}
 468
 469 void VertexShaderTile::Init(WebGraphicsContext3D* context,
 470                             unsigned program,
 471                             bool using_bind_uniform,
 472                             int* base_uniform_index) {
 473   static const char* uniforms[] = {
 474     "matrix",
 475     "quad",
 476     "vertexTexTransform",
 477   };
 478   int locations[arraysize(uniforms)];
 479
 480   GetProgramUniformLocations(context,
 481                              program,
 482                              arraysize(uniforms),
 483                              uniforms,
 484                              locations,
 485                              using_bind_uniform,
 486                              base_uniform_index);
 487   matrix_location_ = locations[0];
 488   quad_location_ = locations[1];
 489   vertex_tex_transform_location_ = locations[2];
 490 }
 491
 492 std::string VertexShaderTile::GetShaderString() const {
 493   return VERTEX_SHADER(
 494     attribute TexCoordPrecision vec4 a_position;
 495     attribute float a_index;
 496     uniform mat4 matrix;
 497     uniform TexCoordPrecision vec2 quad[4];
 498     uniform TexCoordPrecision vec4 vertexTexTransform;
 499     varying TexCoordPrecision vec2 v_texCoord;
 500     void main() {
 501       vec2 pos = quad[int(a_index)];  // NOLINT
 502       gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
 503       v_texCoord = pos.xy * vertexTexTransform.zw + vertexTexTransform.xy;
 504     }
 505   );  // NOLINT(whitespace/parens)
 506 }
 507
 508 VertexShaderTileAA::VertexShaderTileAA()
 509     : matrix_location_(-1),
 510       viewport_location_(-1),
 511       quad_location_(-1),
 512       edge_location_(-1),
 513       vertex_tex_transform_location_(-1) {}
 514
 515 void VertexShaderTileAA::Init(WebGraphicsContext3D* context,
 516                               unsigned program,
 517                               bool using_bind_uniform,
 518                               int* base_uniform_index) {
 519   static const char* uniforms[] = {
 520     "matrix",
 521     "viewport",
 522     "quad",
 523     "edge",
 524     "vertexTexTransform",
 525   };
 526   int locations[arraysize(uniforms)];
 527
 528   GetProgramUniformLocations(context,
 529                              program,
 530                              arraysize(uniforms),
 531                              uniforms,
 532                              locations,
 533                              using_bind_uniform,
 534                              base_uniform_index);
 535   matrix_location_ = locations[0];
 536   viewport_location_ = locations[1];
 537   quad_location_ = locations[2];
 538   edge_location_ = locations[3];
 539   vertex_tex_transform_location_ = locations[4];
 540 }
 541
 542 std::string VertexShaderTileAA::GetShaderString() const {
 543   return VERTEX_SHADER(
 544     attribute TexCoordPrecision vec4 a_position;
 545     attribute float a_index;
 546     uniform mat4 matrix;
 547     uniform vec4 viewport;
 548     uniform TexCoordPrecision vec2 quad[4];
 549     uniform TexCoordPrecision vec3 edge[8];
 550     uniform TexCoordPrecision vec4 vertexTexTransform;
 551     varying TexCoordPrecision vec2 v_texCoord;
 552     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
 553
 554     void main() {
 555       vec2 pos = quad[int(a_index)];  // NOLINT
 556       gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
 557       vec2 ndc_pos = 0.5 * (1.0 + gl_Position.xy / gl_Position.w);
 558       vec3 screen_pos = vec3(viewport.xy + viewport.zw * ndc_pos, 1.0);
 559       edge_dist[0] = vec4(dot(edge[0], screen_pos),
 560                           dot(edge[1], screen_pos),
 561                           dot(edge[2], screen_pos),
 562                           dot(edge[3], screen_pos)) * gl_Position.w;
 563       edge_dist[1] = vec4(dot(edge[4], screen_pos),
 564                           dot(edge[5], screen_pos),
 565                           dot(edge[6], screen_pos),
 566                           dot(edge[7], screen_pos)) * gl_Position.w;
 567       v_texCoord = pos.xy * vertexTexTransform.zw + vertexTexTransform.xy;
 568     }
 569   );  // NOLINT(whitespace/parens)
 570 }
 571
 572 VertexShaderVideoTransform::VertexShaderVideoTransform()
 573     : matrix_location_(-1),
 574       tex_matrix_location_(-1) {}
 575
 576 void VertexShaderVideoTransform::Init(WebGraphicsContext3D* context,
 577                                       unsigned program,
 578                                       bool using_bind_uniform,
 579                                       int* base_uniform_index) {
 580   static const char* uniforms[] = {
 581     "matrix",
 582     "texMatrix",
 583   };
 584   int locations[arraysize(uniforms)];
 585
 586   GetProgramUniformLocations(context,
 587                              program,
 588                              arraysize(uniforms),
 589                              uniforms,
 590                              locations,
 591                              using_bind_uniform,
 592                              base_uniform_index);
 593   matrix_location_ = locations[0];
 594   tex_matrix_location_ = locations[1];
 595 }
 596
 597 std::string VertexShaderVideoTransform::GetShaderString() const {
 598   return VERTEX_SHADER(
 599     attribute vec4 a_position;
 600     attribute TexCoordPrecision vec2 a_texCoord;
 601     uniform mat4 matrix;
 602     uniform TexCoordPrecision mat4 texMatrix;
 603     varying TexCoordPrecision vec2 v_texCoord;
 604     void main() {
 605         gl_Position = matrix * a_position;
 606         v_texCoord =
 607             vec2(texMatrix * vec4(a_texCoord.x, 1.0 - a_texCoord.y, 0.0, 1.0));
 608     }
 609   );  // NOLINT(whitespace/parens)
 610 }
 611
 612 FragmentTexAlphaBinding::FragmentTexAlphaBinding()
 613     : sampler_location_(-1),
 614       alpha_location_(-1) {}
 615
 616 void FragmentTexAlphaBinding::Init(WebGraphicsContext3D* context,
 617                                    unsigned program,
 618                                    bool using_bind_uniform,
 619                                    int* base_uniform_index) {
 620   static const char* uniforms[] = {
 621     "s_texture",
 622     "alpha",
 623   };
 624   int locations[arraysize(uniforms)];
 625
 626   GetProgramUniformLocations(context,
 627                              program,
 628                              arraysize(uniforms),
 629                              uniforms,
 630                              locations,
 631                              using_bind_uniform,
 632                              base_uniform_index);
 633   sampler_location_ = locations[0];
 634   alpha_location_ = locations[1];
 635 }
 636
 637 FragmentTexColorMatrixAlphaBinding::FragmentTexColorMatrixAlphaBinding()
 638     : sampler_location_(-1),
 639       alpha_location_(-1),
 640       color_matrix_location_(-1),
 641       color_offset_location_(-1) {}
 642
 643 void FragmentTexColorMatrixAlphaBinding::Init(WebGraphicsContext3D* context,
 644                                               unsigned program,
 645                                               bool using_bind_uniform,
 646                                               int* base_uniform_index) {
 647   static const char* uniforms[] = {
 648     "s_texture",
 649     "alpha",
 650     "colorMatrix",
 651     "colorOffset",
 652   };
 653   int locations[arraysize(uniforms)];
 654
 655   GetProgramUniformLocations(context,
 656                              program,
 657                              arraysize(uniforms),
 658                              uniforms,
 659                              locations,
 660                              using_bind_uniform,
 661                              base_uniform_index);
 662   sampler_location_ = locations[0];
 663   alpha_location_ = locations[1];
 664   color_matrix_location_ = locations[2];
 665   color_offset_location_ = locations[3];
 666 }
 667
 668 FragmentTexOpaqueBinding::FragmentTexOpaqueBinding()
 669     : sampler_location_(-1) {}
 670
 671 void FragmentTexOpaqueBinding::Init(WebGraphicsContext3D* context,
 672                                     unsigned program,
 673                                     bool using_bind_uniform,
 674                                     int* base_uniform_index) {
 675   static const char* uniforms[] = {
 676     "s_texture",
 677   };
 678   int locations[arraysize(uniforms)];
 679
 680   GetProgramUniformLocations(context,
 681                              program,
 682                              arraysize(uniforms),
 683                              uniforms,
 684                              locations,
 685                              using_bind_uniform,
 686                              base_uniform_index);
 687   sampler_location_ = locations[0];
 688 }
 689
 690 FragmentShaderOESImageExternal::FragmentShaderOESImageExternal()
 691     : sampler_location_(-1) {}
 692
 693 void FragmentShaderOESImageExternal::Init(WebGraphicsContext3D* context,
 694                                           unsigned program,
 695                                           bool using_bind_uniform,
 696                                           int* base_uniform_index) {
 697   static const char* uniforms[] = {
 698     "s_texture",
 699   };
 700   int locations[arraysize(uniforms)];
 701
 702   GetProgramUniformLocations(context,
 703                              program,
 704                              arraysize(uniforms),
 705                              uniforms,
 706                              locations,
 707                              using_bind_uniform,
 708                              base_uniform_index);
 709   sampler_location_ = locations[0];
 710 }
 711
 712 std::string FragmentShaderOESImageExternal::GetShaderString(
 713     TexCoordPrecision precision) const {
 714   // Cannot use the SHADER() macro because of the '#' char
 715   return "#extension GL_OES_EGL_image_external : require\n" +
 716       FRAGMENT_SHADER(
 717          precision mediump float;
 718          varying TexCoordPrecision vec2 v_texCoord;
 719          uniform samplerExternalOES s_texture;
 720          void main() {
 721            vec4 texColor = texture2D(s_texture, v_texCoord);
 722            gl_FragColor = texColor;
 723          }
 724       );  // NOLINT(whitespace/parens)
 725 }
 726
 727 std::string FragmentShaderRGBATexAlpha::GetShaderString(
 728     TexCoordPrecision precision) const {
 729   return FRAGMENT_SHADER(
 730     precision mediump float;
 731     varying TexCoordPrecision vec2 v_texCoord;
 732     uniform sampler2D s_texture;
 733     uniform float alpha;
 734     void main() {
 735       vec4 texColor = texture2D(s_texture, v_texCoord);
 736       gl_FragColor = texColor * alpha;
 737     }
 738   );  // NOLINT(whitespace/parens)
 739 }
 740
 741 std::string FragmentShaderRGBATexColorMatrixAlpha::GetShaderString(
 742     TexCoordPrecision precision) const {
 743   return FRAGMENT_SHADER(
 744     precision mediump float;
 745     varying TexCoordPrecision vec2 v_texCoord;
 746     uniform sampler2D s_texture;
 747     uniform float alpha;
 748     uniform mat4 colorMatrix;
 749     uniform vec4 colorOffset;
 750     void main() {
 751       vec4 texColor = texture2D(s_texture, v_texCoord);
 752       float nonZeroAlpha = max(texColor.a, 0.00001);
 753       texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
 754       texColor = colorMatrix * texColor + colorOffset;
 755       texColor.rgb *= texColor.a;
 756       texColor = clamp(texColor, 0.0, 1.0);
 757       gl_FragColor = texColor * alpha;
 758     }
 759   );  // NOLINT(whitespace/parens)
 760 }
 761
 762 std::string FragmentShaderRGBATexVaryingAlpha::GetShaderString(
 763     TexCoordPrecision precision) const {
 764   return FRAGMENT_SHADER(
 765     precision mediump float;
 766     varying TexCoordPrecision vec2 v_texCoord;
 767     varying float v_alpha;
 768     uniform sampler2D s_texture;
 769     void main() {
 770       vec4 texColor = texture2D(s_texture, v_texCoord);
 771       gl_FragColor = texColor * v_alpha;
 772     }
 773   );  // NOLINT(whitespace/parens)
 774 }
 775
 776 std::string FragmentShaderRGBATexPremultiplyAlpha::GetShaderString(
 777     TexCoordPrecision precision) const {
 778   return FRAGMENT_SHADER(
 779     precision mediump float;
 780     varying TexCoordPrecision vec2 v_texCoord;
 781     varying float v_alpha;
 782     uniform sampler2D s_texture;
 783     void main() {
 784       vec4 texColor = texture2D(s_texture, v_texCoord);
 785       texColor.rgb *= texColor.a;
 786       gl_FragColor = texColor * v_alpha;
 787     }
 788   );  // NOLINT(whitespace/parens)
 789 }
 790
 791 FragmentTexBackgroundBinding::FragmentTexBackgroundBinding()
 792     : background_color_location_(-1),
 793       sampler_location_(-1) {
 794 }
 795
 796 void FragmentTexBackgroundBinding::Init(WebGraphicsContext3D* context,
 797                                         unsigned program,
 798                                         bool using_bind_uniform,
 799                                         int* base_uniform_index) {
 800   static const char* uniforms[] = {
 801     "s_texture",
 802     "background_color",
 803   };
 804   int locations[arraysize(uniforms)];
 805
 806   GetProgramUniformLocations(context,
 807                              program,
 808                              arraysize(uniforms),
 809                              uniforms,
 810                              locations,
 811                              using_bind_uniform,
 812                              base_uniform_index);
 813
 814   sampler_location_ = locations[0];
 815   DCHECK_NE(sampler_location_, -1);
 816
 817   background_color_location_ = locations[1];
 818   DCHECK_NE(background_color_location_, -1);
 819 }
 820
 821 std::string FragmentShaderTexBackgroundVaryingAlpha::GetShaderString(
 822     TexCoordPrecision precision) const {
 823   return FRAGMENT_SHADER(
 824     precision mediump float;
 825     varying TexCoordPrecision vec2 v_texCoord;
 826     varying float v_alpha;
 827     uniform vec4 background_color;
 828     uniform sampler2D s_texture;
 829     void main() {
 830       vec4 texColor = texture2D(s_texture, v_texCoord);
 831       texColor += background_color * (1.0 - texColor.a);
 832       gl_FragColor = texColor * v_alpha;
 833     }
 834   );  // NOLINT(whitespace/parens)
 835 }
 836
 837 std::string FragmentShaderTexBackgroundPremultiplyAlpha::GetShaderString(
 838     TexCoordPrecision precision) const {
 839   return FRAGMENT_SHADER(
 840     precision mediump float;
 841     varying TexCoordPrecision vec2 v_texCoord;
 842     varying float v_alpha;
 843     uniform vec4 background_color;
 844     uniform sampler2D s_texture;
 845     void main() {
 846       vec4 texColor = texture2D(s_texture, v_texCoord);
 847       texColor.rgb *= texColor.a;
 848       texColor += background_color * (1.0 - texColor.a);
 849       gl_FragColor = texColor * v_alpha;
 850     }
 851   );  // NOLINT(whitespace/parens)
 852 }
 853
 854 std::string FragmentShaderRGBATexRectVaryingAlpha::GetShaderString(
 855     TexCoordPrecision precision) const {
 856   return "#extension GL_ARB_texture_rectangle : require\n" +
 857       FRAGMENT_SHADER(
 858         precision mediump float;
 859         varying TexCoordPrecision vec2 v_texCoord;
 860         varying float v_alpha;
 861         uniform sampler2DRect s_texture;
 862         void main() {
 863           vec4 texColor = texture2DRect(s_texture, v_texCoord);
 864           gl_FragColor = texColor * v_alpha;
 865         }
 866       );  // NOLINT(whitespace/parens)
 867 }
 868
 869 std::string FragmentShaderRGBATexOpaque::GetShaderString(
 870     TexCoordPrecision precision) const {
 871   return FRAGMENT_SHADER(
 872     precision mediump float;
 873     varying TexCoordPrecision vec2 v_texCoord;
 874     uniform sampler2D s_texture;
 875     void main() {
 876       vec4 texColor = texture2D(s_texture, v_texCoord);
 877       gl_FragColor = vec4(texColor.rgb, 1.0);
 878     }
 879   );  // NOLINT(whitespace/parens)
 880 }
 881
 882 std::string FragmentShaderRGBATex::GetShaderString(
 883     TexCoordPrecision precision) const {
 884   return FRAGMENT_SHADER(
 885     precision mediump float;
 886     varying TexCoordPrecision vec2 v_texCoord;
 887     uniform sampler2D s_texture;
 888     void main() {
 889       gl_FragColor = texture2D(s_texture, v_texCoord);
 890     }
 891   );  // NOLINT(whitespace/parens)
 892 }
 893
 894 std::string FragmentShaderRGBATexSwizzleAlpha::GetShaderString(
 895     TexCoordPrecision precision) const {
 896   return FRAGMENT_SHADER(
 897     precision mediump float;
 898     varying TexCoordPrecision vec2 v_texCoord;
 899     uniform sampler2D s_texture;
 900     uniform float alpha;
 901     void main() {
 902         vec4 texColor = texture2D(s_texture, v_texCoord);
 903         gl_FragColor =
 904             vec4(texColor.z, texColor.y, texColor.x, texColor.w) * alpha;
 905     }
 906   );  // NOLINT(whitespace/parens)
 907 }
 908
 909 std::string FragmentShaderRGBATexSwizzleOpaque::GetShaderString(
 910     TexCoordPrecision precision) const {
 911   return FRAGMENT_SHADER(
 912     precision mediump float;
 913     varying TexCoordPrecision vec2 v_texCoord;
 914     uniform sampler2D s_texture;
 915     void main() {
 916       vec4 texColor = texture2D(s_texture, v_texCoord);
 917       gl_FragColor = vec4(texColor.z, texColor.y, texColor.x, 1.0);
 918     }
 919   );  // NOLINT(whitespace/parens)
 920 }
 921
 922 FragmentShaderRGBATexAlphaAA::FragmentShaderRGBATexAlphaAA()
 923     : sampler_location_(-1),
 924       alpha_location_(-1) {}
 925
 926 void FragmentShaderRGBATexAlphaAA::Init(WebGraphicsContext3D* context,
 927                                         unsigned program,
 928                                         bool using_bind_uniform,
 929                                         int* base_uniform_index) {
 930   static const char* uniforms[] = {
 931     "s_texture",
 932     "alpha",
 933   };
 934   int locations[arraysize(uniforms)];
 935
 936   GetProgramUniformLocations(context,
 937                              program,
 938                              arraysize(uniforms),
 939                              uniforms,
 940                              locations,
 941                              using_bind_uniform,
 942                              base_uniform_index);
 943   sampler_location_ = locations[0];
 944   alpha_location_ = locations[1];
 945 }
 946
 947 std::string FragmentShaderRGBATexAlphaAA::GetShaderString(
 948     TexCoordPrecision precision) const {
 949   return FRAGMENT_SHADER(
 950     precision mediump float;
 951     uniform sampler2D s_texture;
 952     uniform float alpha;
 953     varying TexCoordPrecision vec2 v_texCoord;
 954     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
 955
 956     void main() {
 957       vec4 texColor = texture2D(s_texture, v_texCoord);
 958       vec4 d4 = min(edge_dist[0], edge_dist[1]);
 959       vec2 d2 = min(d4.xz, d4.yw);
 960       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
 961       gl_FragColor = texColor * alpha * aa;
 962     }
 963   );  // NOLINT(whitespace/parens)
 964 }
 965
 966 FragmentTexClampAlphaAABinding::FragmentTexClampAlphaAABinding()
 967     : sampler_location_(-1),
 968       alpha_location_(-1),
 969       fragment_tex_transform_location_(-1) {}
 970
 971 void FragmentTexClampAlphaAABinding::Init(WebGraphicsContext3D* context,
 972                                           unsigned program,
 973                                           bool using_bind_uniform,
 974                                           int* base_uniform_index) {
 975   static const char* uniforms[] = {
 976     "s_texture",
 977     "alpha",
 978     "fragmentTexTransform",
 979   };
 980   int locations[arraysize(uniforms)];
 981
 982   GetProgramUniformLocations(context,
 983                              program,
 984                              arraysize(uniforms),
 985                              uniforms,
 986                              locations,
 987                              using_bind_uniform,
 988                              base_uniform_index);
 989   sampler_location_ = locations[0];
 990   alpha_location_ = locations[1];
 991   fragment_tex_transform_location_ = locations[2];
 992 }
 993
 994 std::string FragmentShaderRGBATexClampAlphaAA::GetShaderString(
 995     TexCoordPrecision precision) const {
 996   return FRAGMENT_SHADER(
 997     precision mediump float;
 998     uniform sampler2D s_texture;
 999     uniform float alpha;
1000     uniform TexCoordPrecision vec4 fragmentTexTransform;
1001     varying TexCoordPrecision vec2 v_texCoord;
1002     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
1003
1004     void main() {
1005       TexCoordPrecision vec2 texCoord =
1006           clamp(v_texCoord, 0.0, 1.0) * fragmentTexTransform.zw +
1007           fragmentTexTransform.xy;
1008       vec4 texColor = texture2D(s_texture, texCoord);
1009       vec4 d4 = min(edge_dist[0], edge_dist[1]);
1010       vec2 d2 = min(d4.xz, d4.yw);
1011       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
1012       gl_FragColor = texColor * alpha * aa;
1013     }
1014   );  // NOLINT(whitespace/parens)
1015 }
1016
1017 std::string FragmentShaderRGBATexClampSwizzleAlphaAA::GetShaderString(
1018     TexCoordPrecision precision) const {
1019   return FRAGMENT_SHADER(
1020     precision mediump float;
1021     uniform sampler2D s_texture;
1022     uniform float alpha;
1023     uniform TexCoordPrecision vec4 fragmentTexTransform;
1024     varying TexCoordPrecision vec2 v_texCoord;
1025     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
1026
1027     void main() {
1028       TexCoordPrecision vec2 texCoord =
1029           clamp(v_texCoord, 0.0, 1.0) * fragmentTexTransform.zw +
1030           fragmentTexTransform.xy;
1031       vec4 texColor = texture2D(s_texture, texCoord);
1032       vec4 d4 = min(edge_dist[0], edge_dist[1]);
1033       vec2 d2 = min(d4.xz, d4.yw);
1034       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
1035       gl_FragColor = vec4(texColor.z, texColor.y, texColor.x, texColor.w) *
1036           alpha * aa;
1037     }
1038   );  // NOLINT(whitespace/parens)
1039 }
1040
1041 FragmentShaderRGBATexAlphaMask::FragmentShaderRGBATexAlphaMask()
1042     : sampler_location_(-1),
1043       mask_sampler_location_(-1),
1044       alpha_location_(-1),
1045       mask_tex_coord_scale_location_(-1) {}
1046
1047 void FragmentShaderRGBATexAlphaMask::Init(WebGraphicsContext3D* context,
1048                                           unsigned program,
1049                                           bool using_bind_uniform,
1050                                           int* base_uniform_index) {
1051   static const char* uniforms[] = {
1052     "s_texture",
1053     "s_mask",
1054     "alpha",
1055     "maskTexCoordScale",
1056     "maskTexCoordOffset",
1057   };
1058   int locations[arraysize(uniforms)];
1059
1060   GetProgramUniformLocations(context,
1061                              program,
1062                              arraysize(uniforms),
1063                              uniforms,
1064                              locations,
1065                              using_bind_uniform,
1066                              base_uniform_index);
1067   sampler_location_ = locations[0];
1068   mask_sampler_location_ = locations[1];
1069   alpha_location_ = locations[2];
1070   mask_tex_coord_scale_location_ = locations[3];
1071   mask_tex_coord_offset_location_ = locations[4];
1072 }
1073
1074 std::string FragmentShaderRGBATexAlphaMask::GetShaderString(
1075     TexCoordPrecision precision) const {
1076   return FRAGMENT_SHADER(
1077     precision mediump float;
1078     varying TexCoordPrecision vec2 v_texCoord;
1079     uniform sampler2D s_texture;
1080     uniform sampler2D s_mask;
1081     uniform TexCoordPrecision vec2 maskTexCoordScale;
1082     uniform TexCoordPrecision vec2 maskTexCoordOffset;
1083     uniform float alpha;
1084     void main() {
1085       vec4 texColor = texture2D(s_texture, v_texCoord);
1086       TexCoordPrecision vec2 maskTexCoord =
1087           vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
1088                maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
1089       vec4 maskColor = texture2D(s_mask, maskTexCoord);
1090       gl_FragColor = texColor * alpha * maskColor.w;
1091     }
1092   );  // NOLINT(whitespace/parens)
1093 }
1094
1095 FragmentShaderRGBATexAlphaMaskAA::FragmentShaderRGBATexAlphaMaskAA()
1096     : sampler_location_(-1),
1097       mask_sampler_location_(-1),
1098       alpha_location_(-1),
1099       mask_tex_coord_scale_location_(-1),
1100       mask_tex_coord_offset_location_(-1) {}
1101
1102 void FragmentShaderRGBATexAlphaMaskAA::Init(WebGraphicsContext3D* context,
1103                                             unsigned program,
1104                                             bool using_bind_uniform,
1105                                             int* base_uniform_index) {
1106   static const char* uniforms[] = {
1107     "s_texture",
1108     "s_mask",
1109     "alpha",
1110     "maskTexCoordScale",
1111     "maskTexCoordOffset",
1112   };
1113   int locations[arraysize(uniforms)];
1114
1115   GetProgramUniformLocations(context,
1116                              program,
1117                              arraysize(uniforms),
1118                              uniforms,
1119                              locations,
1120                              using_bind_uniform,
1121                              base_uniform_index);
1122   sampler_location_ = locations[0];
1123   mask_sampler_location_ = locations[1];
1124   alpha_location_ = locations[2];
1125   mask_tex_coord_scale_location_ = locations[3];
1126   mask_tex_coord_offset_location_ = locations[4];
1127 }
1128
1129 std::string FragmentShaderRGBATexAlphaMaskAA::GetShaderString(
1130     TexCoordPrecision precision) const {
1131   return FRAGMENT_SHADER(
1132     precision mediump float;
1133     uniform sampler2D s_texture;
1134     uniform sampler2D s_mask;
1135     uniform TexCoordPrecision vec2 maskTexCoordScale;
1136     uniform TexCoordPrecision vec2 maskTexCoordOffset;
1137     uniform float alpha;
1138     varying TexCoordPrecision vec2 v_texCoord;
1139     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
1140
1141     void main() {
1142       vec4 texColor = texture2D(s_texture, v_texCoord);
1143       TexCoordPrecision vec2 maskTexCoord =
1144           vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
1145                maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
1146       vec4 maskColor = texture2D(s_mask, maskTexCoord);
1147       vec4 d4 = min(edge_dist[0], edge_dist[1]);
1148       vec2 d2 = min(d4.xz, d4.yw);
1149       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
1150       gl_FragColor = texColor * alpha * maskColor.w * aa;
1151     }
1152   );  // NOLINT(whitespace/parens)
1153 }
1154
1155 FragmentShaderRGBATexAlphaMaskColorMatrixAA::
1156     FragmentShaderRGBATexAlphaMaskColorMatrixAA()
1157         : sampler_location_(-1),
1158           mask_sampler_location_(-1),
1159           alpha_location_(-1),
1160           mask_tex_coord_scale_location_(-1),
1161           color_matrix_location_(-1),
1162           color_offset_location_(-1) {}
1163
1164 void FragmentShaderRGBATexAlphaMaskColorMatrixAA::Init(
1165     WebGraphicsContext3D* context,
1166     unsigned program,
1167     bool using_bind_uniform,
1168     int* base_uniform_index) {
1169   static const char* uniforms[] = {
1170     "s_texture",
1171     "s_mask",
1172     "alpha",
1173     "maskTexCoordScale",
1174     "maskTexCoordOffset",
1175     "colorMatrix",
1176     "colorOffset",
1177   };
1178   int locations[arraysize(uniforms)];
1179
1180   GetProgramUniformLocations(context,
1181                              program,
1182                              arraysize(uniforms),
1183                              uniforms,
1184                              locations,
1185                              using_bind_uniform,
1186                              base_uniform_index);
1187   sampler_location_ = locations[0];
1188   mask_sampler_location_ = locations[1];
1189   alpha_location_ = locations[2];
1190   mask_tex_coord_scale_location_ = locations[3];
1191   mask_tex_coord_offset_location_ = locations[4];
1192   color_matrix_location_ = locations[5];
1193   color_offset_location_ = locations[6];
1194 }
1195
1196 std::string FragmentShaderRGBATexAlphaMaskColorMatrixAA::GetShaderString(
1197     TexCoordPrecision precision) const {
1198   return FRAGMENT_SHADER(
1199     precision mediump float;
1200     uniform sampler2D s_texture;
1201     uniform sampler2D s_mask;
1202     uniform vec2 maskTexCoordScale;
1203     uniform vec2 maskTexCoordOffset;
1204     uniform mat4 colorMatrix;
1205     uniform vec4 colorOffset;
1206     uniform float alpha;
1207     varying TexCoordPrecision vec2 v_texCoord;
1208     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
1209
1210     void main() {
1211       vec4 texColor = texture2D(s_texture, v_texCoord);
1212       float nonZeroAlpha = max(texColor.a, 0.00001);
1213       texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
1214       texColor = colorMatrix * texColor + colorOffset;
1215       texColor.rgb *= texColor.a;
1216       texColor = clamp(texColor, 0.0, 1.0);
1217       TexCoordPrecision vec2 maskTexCoord =
1218           vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
1219                maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
1220       vec4 maskColor = texture2D(s_mask, maskTexCoord);
1221       vec4 d4 = min(edge_dist[0], edge_dist[1]);
1222       vec2 d2 = min(d4.xz, d4.yw);
1223       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
1224       gl_FragColor = texColor * alpha * maskColor.w * aa;
1225     }
1226   );  // NOLINT(whitespace/parens)
1227 }
1228
1229 FragmentShaderRGBATexAlphaColorMatrixAA::
1230     FragmentShaderRGBATexAlphaColorMatrixAA()
1231         : sampler_location_(-1),
1232           alpha_location_(-1),
1233           color_matrix_location_(-1),
1234           color_offset_location_(-1) {}
1235
1236 void FragmentShaderRGBATexAlphaColorMatrixAA::Init(
1237       WebGraphicsContext3D* context,
1238       unsigned program,
1239       bool using_bind_uniform,
1240       int* base_uniform_index) {
1241   static const char* uniforms[] = {
1242     "s_texture",
1243     "alpha",
1244     "colorMatrix",
1245     "colorOffset",
1246   };
1247   int locations[arraysize(uniforms)];
1248
1249   GetProgramUniformLocations(context,
1250                              program,
1251                              arraysize(uniforms),
1252                              uniforms,
1253                              locations,
1254                              using_bind_uniform,
1255                              base_uniform_index);
1256   sampler_location_ = locations[0];
1257   alpha_location_ = locations[1];
1258   color_matrix_location_ = locations[2];
1259   color_offset_location_ = locations[3];
1260 }
1261
1262 std::string FragmentShaderRGBATexAlphaColorMatrixAA::GetShaderString(
1263     TexCoordPrecision precision) const {
1264   return FRAGMENT_SHADER(
1265     precision mediump float;
1266     uniform sampler2D s_texture;
1267     uniform float alpha;
1268     uniform mat4 colorMatrix;
1269     uniform vec4 colorOffset;
1270     varying TexCoordPrecision vec2 v_texCoord;
1271     varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
1272
1273     void main() {
1274       vec4 texColor = texture2D(s_texture, v_texCoord);
1275       float nonZeroAlpha = max(texColor.a, 0.00001);
1276       texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
1277       texColor = colorMatrix * texColor + colorOffset;
1278       texColor.rgb *= texColor.a;
1279       texColor = clamp(texColor, 0.0, 1.0);
1280       vec4 d4 = min(edge_dist[0], edge_dist[1]);
1281       vec2 d2 = min(d4.xz, d4.yw);
1282       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
1283       gl_FragColor = texColor * alpha * aa;
1284     }
1285   );  // NOLINT(whitespace/parens)
1286 }
1287
1288 FragmentShaderRGBATexAlphaMaskColorMatrix::
1289     FragmentShaderRGBATexAlphaMaskColorMatrix()
1290         : sampler_location_(-1),
1291           mask_sampler_location_(-1),
1292           alpha_location_(-1),
1293           mask_tex_coord_scale_location_(-1) {}
1294
1295 void FragmentShaderRGBATexAlphaMaskColorMatrix::Init(
1296     WebGraphicsContext3D* context,
1297     unsigned program,
1298     bool using_bind_uniform,
1299     int* base_uniform_index) {
1300   static const char* uniforms[] = {
1301     "s_texture",
1302     "s_mask",
1303     "alpha",
1304     "maskTexCoordScale",
1305     "maskTexCoordOffset",
1306     "colorMatrix",
1307     "colorOffset",
1308   };
1309   int locations[arraysize(uniforms)];
1310
1311   GetProgramUniformLocations(context,
1312                              program,
1313                              arraysize(uniforms),
1314                              uniforms,
1315                              locations,
1316                              using_bind_uniform,
1317                              base_uniform_index);
1318   sampler_location_ = locations[0];
1319   mask_sampler_location_ = locations[1];
1320   alpha_location_ = locations[2];
1321   mask_tex_coord_scale_location_ = locations[3];
1322   mask_tex_coord_offset_location_ = locations[4];
1323   color_matrix_location_ = locations[5];
1324   color_offset_location_ = locations[6];
1325 }
1326
1327 std::string FragmentShaderRGBATexAlphaMaskColorMatrix::GetShaderString(
1328     TexCoordPrecision precision) const {
1329   return FRAGMENT_SHADER(
1330     precision mediump float;
1331     varying TexCoordPrecision vec2 v_texCoord;
1332     uniform sampler2D s_texture;
1333     uniform sampler2D s_mask;
1334     uniform vec2 maskTexCoordScale;
1335     uniform vec2 maskTexCoordOffset;
1336     uniform mat4 colorMatrix;
1337     uniform vec4 colorOffset;
1338     uniform float alpha;
1339     void main() {
1340       vec4 texColor = texture2D(s_texture, v_texCoord);
1341       float nonZeroAlpha = max(texColor.a, 0.00001);
1342       texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
1343       texColor = colorMatrix * texColor + colorOffset;
1344       texColor.rgb *= texColor.a;
1345       texColor = clamp(texColor, 0.0, 1.0);
1346       TexCoordPrecision vec2 maskTexCoord =
1347           vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
1348                maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
1349       vec4 maskColor = texture2D(s_mask, maskTexCoord);
1350       gl_FragColor = texColor * alpha * maskColor.w;
1351     }
1352   );  // NOLINT(whitespace/parens)
1353 }
1354
1355 FragmentShaderYUVVideo::FragmentShaderYUVVideo()
1356     : y_texture_location_(-1),
1357       u_texture_location_(-1),
1358       v_texture_location_(-1),
1359       alpha_location_(-1),
1360       yuv_matrix_location_(-1),
1361       yuv_adj_location_(-1) {}
1362
1363 void FragmentShaderYUVVideo::Init(WebGraphicsContext3D* context,
1364                                   unsigned program,
1365                                   bool using_bind_uniform,
1366                                   int* base_uniform_index) {
1367   static const char* uniforms[] = {
1368     "y_texture",
1369     "u_texture",
1370     "v_texture",
1371     "alpha",
1372     "yuv_matrix",
1373     "yuv_adj",
1374   };
1375   int locations[arraysize(uniforms)];
1376
1377   GetProgramUniformLocations(context,
1378                              program,
1379                              arraysize(uniforms),
1380                              uniforms,
1381                              locations,
1382                              using_bind_uniform,
1383                              base_uniform_index);
1384   y_texture_location_ = locations[0];
1385   u_texture_location_ = locations[1];
1386   v_texture_location_ = locations[2];
1387   alpha_location_ = locations[3];
1388   yuv_matrix_location_ = locations[4];
1389   yuv_adj_location_ = locations[5];
1390 }
1391
1392 std::string FragmentShaderYUVVideo::GetShaderString(
1393     TexCoordPrecision precision) const {
1394   return FRAGMENT_SHADER(
1395     precision mediump float;
1396     precision mediump int;
1397     varying TexCoordPrecision vec2 v_texCoord;
1398     uniform sampler2D y_texture;
1399     uniform sampler2D u_texture;
1400     uniform sampler2D v_texture;
1401     uniform float alpha;
1402     uniform vec3 yuv_adj;
1403     uniform mat3 yuv_matrix;
1404     void main() {
1405       float y_raw = texture2D(y_texture, v_texCoord).x;
1406       float u_unsigned = texture2D(u_texture, v_texCoord).x;
1407       float v_unsigned = texture2D(v_texture, v_texCoord).x;
1408       vec3 yuv = vec3(y_raw, u_unsigned, v_unsigned) + yuv_adj;
1409       vec3 rgb = yuv_matrix * yuv;
1410       gl_FragColor = vec4(rgb, 1.0) * alpha;
1411     }
1412   );  // NOLINT(whitespace/parens)
1413 }
1414
1415 FragmentShaderYUVAVideo::FragmentShaderYUVAVideo()
1416     : y_texture_location_(-1),
1417       u_texture_location_(-1),
1418       v_texture_location_(-1),
1419       a_texture_location_(-1),
1420       alpha_location_(-1),
1421       yuv_matrix_location_(-1),
1422       yuv_adj_location_(-1) {
1423 }
1424
1425 void FragmentShaderYUVAVideo::Init(WebGraphicsContext3D* context,
1426                                    unsigned program,
1427                                    bool using_bind_uniform,
1428                                    int* base_uniform_index) {
1429   static const char* uniforms[] = {
1430       "y_texture",
1431       "u_texture",
1432       "v_texture",
1433       "a_texture",
1434       "alpha",
1435       "cc_matrix",
1436       "yuv_adj",
1437   };
1438   int locations[arraysize(uniforms)];
1439
1440   GetProgramUniformLocations(context,
1441                              program,
1442                              arraysize(uniforms),
1443                              uniforms,
1444                              locations,
1445                              using_bind_uniform,
1446                              base_uniform_index);
1447   y_texture_location_ = locations[0];
1448   u_texture_location_ = locations[1];
1449   v_texture_location_ = locations[2];
1450   a_texture_location_ = locations[3];
1451   alpha_location_ = locations[4];
1452   yuv_matrix_location_ = locations[5];
1453   yuv_adj_location_ = locations[6];
1454 }
1455
1456 std::string FragmentShaderYUVAVideo::GetShaderString(
1457     TexCoordPrecision precision) const {
1458   return FRAGMENT_SHADER(
1459     precision mediump float;
1460     precision mediump int;
1461     varying TexCoordPrecision vec2 v_texCoord;
1462     uniform sampler2D y_texture;
1463     uniform sampler2D u_texture;
1464     uniform sampler2D v_texture;
1465     uniform sampler2D a_texture;
1466     uniform float alpha;
1467     uniform vec3 yuv_adj;
1468     uniform mat3 yuv_matrix;
1469     void main() {
1470       float y_raw = texture2D(y_texture, v_texCoord).x;
1471       float u_unsigned = texture2D(u_texture, v_texCoord).x;
1472       float v_unsigned = texture2D(v_texture, v_texCoord).x;
1473       float a_raw = texture2D(a_texture, v_texCoord).x;
1474       vec3 yuv = vec3(y_raw, u_unsigned, v_unsigned) + yuv_adj;
1475       vec3 rgb = yuv_matrix * yuv;
1476       gl_FragColor = vec4(rgb, 1.0) * (alpha * a_raw);
1477     }
1478   );  // NOLINT(whitespace/parens)
1479 }
1480
1481 FragmentShaderColor::FragmentShaderColor()
1482     : color_location_(-1) {}
1483
1484 void FragmentShaderColor::Init(WebGraphicsContext3D* context,
1485                                unsigned program,
1486                                bool using_bind_uniform,
1487                                int* base_uniform_index) {
1488   static const char* uniforms[] = {
1489     "color",
1490   };
1491   int locations[arraysize(uniforms)];
1492
1493   GetProgramUniformLocations(context,
1494                              program,
1495                              arraysize(uniforms),
1496                              uniforms,
1497                              locations,
1498                              using_bind_uniform,
1499                              base_uniform_index);
1500   color_location_ = locations[0];
1501 }
1502
1503 std::string FragmentShaderColor::GetShaderString(
1504     TexCoordPrecision precision) const {
1505   return FRAGMENT_SHADER(
1506     precision mediump float;
1507     uniform vec4 color;
1508     void main() {
1509       gl_FragColor = color;
1510     }
1511   );  // NOLINT(whitespace/parens)
1512 }
1513
1514 FragmentShaderColorAA::FragmentShaderColorAA()
1515     : color_location_(-1) {}
1516
1517 void FragmentShaderColorAA::Init(WebGraphicsContext3D* context,
1518                                  unsigned program,
1519                                  bool using_bind_uniform,
1520                                  int* base_uniform_index) {
1521   static const char* uniforms[] = {
1522     "color",
1523   };
1524   int locations[arraysize(uniforms)];
1525
1526   GetProgramUniformLocations(context,
1527                              program,
1528                              arraysize(uniforms),
1529                              uniforms,
1530                              locations,
1531                              using_bind_uniform,
1532                              base_uniform_index);
1533   color_location_ = locations[0];
1534 }
1535
1536 std::string FragmentShaderColorAA::GetShaderString(
1537     TexCoordPrecision precision) const {
1538   return FRAGMENT_SHADER(
1539     precision mediump float;
1540     uniform vec4 color;
1541     varying vec4 edge_dist[2];  // 8 edge distances.
1542
1543     void main() {
1544       vec4 d4 = min(edge_dist[0], edge_dist[1]);
1545       vec2 d2 = min(d4.xz, d4.yw);
1546       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
1547       gl_FragColor = color * aa;
1548     }
1549   );  // NOLINT(whitespace/parens)
1550 }
1551
1552 FragmentShaderCheckerboard::FragmentShaderCheckerboard()
1553     : alpha_location_(-1),
1554       tex_transform_location_(-1),
1555       frequency_location_(-1) {}
1556
1557 void FragmentShaderCheckerboard::Init(WebGraphicsContext3D* context,
1558                                       unsigned program,
1559                                       bool using_bind_uniform,
1560                                       int* base_uniform_index) {
1561   static const char* uniforms[] = {
1562     "alpha",
1563     "texTransform",
1564     "frequency",
1565     "color",
1566   };
1567   int locations[arraysize(uniforms)];
1568
1569   GetProgramUniformLocations(context,
1570                              program,
1571                              arraysize(uniforms),
1572                              uniforms,
1573                              locations,
1574                              using_bind_uniform,
1575                              base_uniform_index);
1576   alpha_location_ = locations[0];
1577   tex_transform_location_ = locations[1];
1578   frequency_location_ = locations[2];
1579   color_location_ = locations[3];
1580 }
1581
1582 std::string FragmentShaderCheckerboard::GetShaderString(
1583     TexCoordPrecision precision) const {
1584   // Shader based on Example 13-17 of "OpenGL ES 2.0 Programming Guide"
1585   // by Munshi, Ginsburg, Shreiner.
1586   return FRAGMENT_SHADER(
1587     precision mediump float;
1588     precision mediump int;
1589     varying vec2 v_texCoord;
1590     uniform float alpha;
1591     uniform float frequency;
1592     uniform vec4 texTransform;
1593     uniform vec4 color;
1594     void main() {
1595       vec4 color1 = vec4(1.0, 1.0, 1.0, 1.0);
1596       vec4 color2 = color;
1597       vec2 texCoord =
1598           clamp(v_texCoord, 0.0, 1.0) * texTransform.zw + texTransform.xy;
1599       vec2 coord = mod(floor(texCoord * frequency * 2.0), 2.0);
1600       float picker = abs(coord.x - coord.y);  // NOLINT
1601       gl_FragColor = mix(color1, color2, picker) * alpha;
1602     }
1603   );  // NOLINT(whitespace/parens)
1604 }
1605
1606 }  // namespace cc