modules/gles2/performance/es2pShaderControlStatementTests.cpp

   1 /*-------------------------------------------------------------------------
   2  * drawElements Quality Program OpenGL ES 2.0 Module
   3  * -------------------------------------------------
   4  *
   5  * Copyright 2014 The Android Open Source Project
   6  *
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  *
  19  *//*!
  20  * \file
  21  * \brief Shader control statement performance tests.
  22  *//*--------------------------------------------------------------------*/
  23
  24 #include "es2pShaderControlStatementTests.hpp"
  25 #include "glsShaderPerformanceCase.hpp"
  26 #include "tcuTestLog.hpp"
  27
  28 #include "glwEnums.hpp"
  29 #include "glwFunctions.hpp"
  30
  31 #include <string>
  32 #include <vector>
  33
  34 namespace deqp
  35 {
  36 namespace gles2
  37 {
  38 namespace Performance
  39 {
  40
  41 using namespace gls;
  42 using namespace glw; // GL types
  43 using tcu::Vec4;
  44 using tcu::TestLog;
  45 using std::string;
  46 using std::vector;
  47
  48 // Writes the workload expression used in conditional tests.
  49 static void writeConditionalWorkload (std::ostringstream& stream, const char* resultName, const char* operandName)
  50 {
  51         const int numMultiplications = 64;
  52
  53         stream << resultName << " = ";
  54
  55         for (int i = 0; i < numMultiplications; i++)
  56         {
  57                 if (i > 0)
  58                         stream << "*";
  59
  60                 stream << operandName;
  61         }
  62
  63         stream << ";";
  64 }
  65
  66 // Writes the workload expression used in loop tests (one iteration).
  67 static void writeLoopWorkload (std::ostringstream& stream, const char* resultName, const char* operandName)
  68 {
  69         const int numMultiplications = 8;
  70
  71         stream << resultName << " = ";
  72
  73         for (int i = 0; i < numMultiplications; i++)
  74         {
  75                 if (i > 0)
  76                         stream << " * ";
  77
  78                 stream << "(" << resultName << " + " << operandName << ")";
  79         }
  80
  81         stream << ";";
  82 }
  83
  84 // The type of decision to be made in a conditional expression.
  85 // \note In fragment cases with DECISION_ATTRIBUTE, the value in the expression will actually be a varying.
  86 enum DecisionType
  87 {
  88         DECISION_STATIC = 0,
  89         DECISION_UNIFORM,
  90         DECISION_ATTRIBUTE,
  91
  92         DECISION_LAST
  93 };
  94
  95 class ControlStatementCase :  public ShaderPerformanceCase
  96 {
  97 public:
  98         ControlStatementCase (tcu::TestContext& testCtx, glu::RenderContext& renderCtx, const char* name, const char* description, gls::PerfCaseType caseType)
  99                 : ShaderPerformanceCase(testCtx, renderCtx, name, description, caseType)
 100         {
 101         }
 102
 103         void init (void)
 104         {
 105                 m_testCtx.getLog() << TestLog::Message << "Using additive blending." << TestLog::EndMessage;
 106                 ShaderPerformanceCase::init();
 107         }
 108
 109         void setupRenderState (void)
 110         {
 111                 const glw::Functions& gl = m_renderCtx.getFunctions();
 112
 113                 gl.enable(GL_BLEND);
 114                 gl.blendEquation(GL_FUNC_ADD);
 115                 gl.blendFunc(GL_ONE, GL_ONE);
 116         }
 117 };
 118
 119 class ConditionalCase : public ControlStatementCase
 120 {
 121 public:
 122         enum BranchResult
 123         {
 124                 BRANCH_TRUE = 0,
 125                 BRANCH_FALSE,
 126                 BRANCH_MIXED,
 127
 128                 BRANCH_LAST
 129         };
 130
 131         enum WorkloadDivision
 132         {
 133                 WORKLOAD_DIVISION_EVEN = 0,             //! Both true and false branches contain same amount of computation.
 134                 WORKLOAD_DIVISION_TRUE_HEAVY,   //! True branch contains more computation.
 135                 WORKLOAD_DIVISION_FALSE_HEAVY,  //! False branch contains more computation.
 136
 137                 WORKLOAD_DIVISION_LAST
 138         };
 139
 140                                                 ConditionalCase         (Context& context, const char* name, const char* description, DecisionType decisionType, BranchResult branchType, WorkloadDivision workloadDivision, bool isVertex);
 141                                                 ~ConditionalCase        (void);
 142
 143         void                            init                            (void);
 144         void                            deinit                          (void);
 145         void                            setupProgram            (deUint32 program);
 146
 147 private:
 148         DecisionType            m_decisionType;
 149         BranchResult            m_branchType;
 150         WorkloadDivision        m_workloadDivision;
 151
 152         vector<float>           m_comparisonValueArray; // Will contain per-vertex comparison values if using mixed branch type in vertex case.
 153         deUint32                        m_arrayBuffer;
 154 };
 155
 156 ConditionalCase::ConditionalCase (Context& context, const char* name, const char* description, DecisionType decisionType, BranchResult branchType, WorkloadDivision workloadDivision, bool isVertex)
 157         : ControlStatementCase                  (context.getTestContext(), context.getRenderContext(), name, description, isVertex ? CASETYPE_VERTEX : CASETYPE_FRAGMENT)
 158         , m_decisionType                                (decisionType)
 159         , m_branchType                                  (branchType)
 160         , m_workloadDivision                    (workloadDivision)
 161         , m_arrayBuffer                                 (0)
 162 {
 163 }
 164
 165 void ConditionalCase::init (void)
 166 {
 167         bool                    isVertexCase            = m_caseType == CASETYPE_VERTEX;
 168
 169         bool                    isStaticCase            = m_decisionType == DECISION_STATIC;
 170         bool                    isUniformCase           = m_decisionType == DECISION_UNIFORM;
 171         bool                    isAttributeCase         = m_decisionType == DECISION_ATTRIBUTE;
 172
 173         DE_ASSERT(isStaticCase || isUniformCase || isAttributeCase);
 174
 175         bool                    isConditionTrue         = m_branchType == BRANCH_TRUE;
 176         bool                    isConditionFalse        = m_branchType == BRANCH_FALSE;
 177         bool                    isConditionMixed        = m_branchType == BRANCH_MIXED;
 178
 179         DE_ASSERT(isConditionTrue || isConditionFalse || isConditionMixed);
 180         DE_UNREF(isConditionFalse);
 181
 182         DE_ASSERT(isAttributeCase || !isConditionMixed); // The branch taken can vary between executions only if using attribute input.
 183
 184         const char*             staticCompareValueStr   = isConditionTrue       ? "1.0" : "-1.0";
 185         const char*             compareValueStr                 = isStaticCase          ? staticCompareValueStr :
 186                                                                                           isUniformCase         ? "u_compareValue" :
 187                                                                                           isVertexCase          ? "a_compareValue" :
 188                                                                                                                                   "v_compareValue";
 189
 190         std::ostringstream      vtx;
 191         std::ostringstream      frag;
 192         std::ostringstream&     op              = isVertexCase ? vtx : frag;
 193
 194         vtx << "attribute highp vec4 a_position;\n";    // Position attribute.
 195         vtx << "attribute mediump vec4 a_value0;\n";    // Input for workload calculations of "true" branch.
 196         vtx << "attribute mediump vec4 a_value1;\n";    // Input for workload calculations of "false" branch.
 197
 198         // Value to be used in the conditional expression.
 199         if (isAttributeCase)
 200                 vtx << "attribute mediump float a_compareValue;\n";
 201         else if (isUniformCase)
 202                 op << "uniform mediump float u_compareValue;\n";
 203
 204         // Varyings.
 205         if (isVertexCase)
 206         {
 207                 vtx << "varying mediump vec4 v_color;\n";
 208                 frag << "varying mediump vec4 v_color;\n";
 209         }
 210         else
 211         {
 212                 vtx << "varying mediump vec4 v_value0;\n";
 213                 vtx << "varying mediump vec4 v_value1;\n";
 214                 frag << "varying mediump vec4 v_value0;\n";
 215                 frag << "varying mediump vec4 v_value1;\n";
 216
 217                 if (isAttributeCase)
 218                 {
 219                         vtx << "varying mediump float v_compareValue;\n";
 220                         frag << "varying mediump float v_compareValue;\n";
 221                 }
 222         }
 223
 224         vtx << "\n";
 225         vtx << "void main()\n";
 226         vtx << "{\n";
 227         vtx << "        gl_Position = a_position;\n";
 228
 229         frag << "\n";
 230         frag << "void main()\n";
 231         frag << "{\n";
 232
 233         op << " mediump vec4 res;\n";
 234
 235         string condition;
 236
 237         if (isConditionMixed && !isVertexCase)
 238                 condition = string("") + "fract(" + compareValueStr + ") < 0.5"; // Comparison result varies with high frequency.
 239         else
 240                 condition = string("") + compareValueStr + " > 0.0";
 241
 242         op << " if (" << condition << ")\n";
 243         op << " {\n";
 244
 245         op << "\t\t";
 246         if (m_workloadDivision == WORKLOAD_DIVISION_EVEN || m_workloadDivision == WORKLOAD_DIVISION_TRUE_HEAVY)
 247                 writeConditionalWorkload(op, "res", isVertexCase ? "a_value0" : "v_value0"); // Workload calculation for the "true" branch.
 248         else
 249                 op << "res = " << (isVertexCase ? "a_value0" : "v_value0") << ";";
 250         op << "\n";
 251
 252         op << " }\n";
 253         op << " else\n";
 254         op << " {\n";
 255
 256         op << "\t\t";
 257         if (m_workloadDivision == WORKLOAD_DIVISION_EVEN || m_workloadDivision == WORKLOAD_DIVISION_FALSE_HEAVY)
 258                 writeConditionalWorkload(op, "res", isVertexCase ? "a_value1" : "v_value1"); // Workload calculations for the "false" branch.
 259         else
 260                 op << "res = " << (isVertexCase ? "a_value1" : "v_value1") << ";";
 261         op << "\n";
 262
 263         op << " }\n";
 264
 265         if (isVertexCase)
 266         {
 267                 // Put result to color variable.
 268                 vtx << "        v_color = res;\n";
 269                 frag << "       gl_FragColor = v_color;\n";
 270         }
 271         else
 272         {
 273                 // Transfer inputs to fragment shader through varyings.
 274                 if (isAttributeCase)
 275                         vtx << "        v_compareValue = a_compareValue;\n";
 276                 vtx << "        v_value0 = a_value0;\n";
 277                 vtx << "        v_value1 = a_value1;\n";
 278
 279                 frag << "       gl_FragColor = res;\n"; // Put result to color variable.
 280         }
 281
 282         vtx << "}\n";
 283         frag << "}\n";
 284
 285         m_vertShaderSource = vtx.str();
 286         m_fragShaderSource = frag.str();
 287
 288         if (isAttributeCase)
 289         {
 290                 if (!isConditionMixed)
 291                 {
 292                         // Every execution takes the same branch.
 293
 294                         float value = isConditionTrue ? +1.0f : -1.0f;
 295                         m_attributes.push_back(AttribSpec("a_compareValue",     Vec4(value, 0.0f, 0.0f, 0.0f),
 296                                                                                                                                 Vec4(value, 0.0f, 0.0f, 0.0f),
 297                                                                                                                                 Vec4(value, 0.0f, 0.0f, 0.0f),
 298                                                                                                                                 Vec4(value, 0.0f, 0.0f, 0.0f)));
 299                 }
 300                 else if (isVertexCase)
 301                 {
 302                         // Vertex case, not every execution takes the same branch.
 303
 304                         const int       numComponents   = 4;
 305                         int                     numVertices             = (getGridWidth() + 1) * (getGridHeight() + 1);
 306
 307                         // setupProgram() will later bind this array as an attribute.
 308                         m_comparisonValueArray.resize(numVertices * numComponents);
 309
 310                         // Make every second vertex take the true branch, and every second the false branch.
 311                         for (int i = 0; i < (int)m_comparisonValueArray.size(); i++)
 312                         {
 313                                 if (i % numComponents == 0)
 314                                         m_comparisonValueArray[i] = (i / numComponents) % 2 == 0 ? +1.0f : -1.0f;
 315                                 else
 316                                         m_comparisonValueArray[i] = 0.0f;
 317                         }
 318                 }
 319                 else // isConditionMixed && !isVertexCase
 320                 {
 321                         // Fragment case, not every execution takes the same branch.
 322                         // \note fract(a_compareValue) < 0.5 will be true for every second column of fragments.
 323
 324                         float minValue = 0.0f;
 325                         float maxValue = (float)getViewportWidth()*0.5f;
 326                         m_attributes.push_back(AttribSpec("a_compareValue",     Vec4(minValue, 0.0f, 0.0f, 0.0f),
 327                                                                                                                                 Vec4(maxValue, 0.0f, 0.0f, 0.0f),
 328                                                                                                                                 Vec4(minValue, 0.0f, 0.0f, 0.0f),
 329                                                                                                                                 Vec4(maxValue, 0.0f, 0.0f, 0.0f)));
 330                 }
 331         }
 332
 333         m_attributes.push_back(AttribSpec("a_value0",   Vec4(0.0f, 0.1f, 0.2f, 0.3f),
 334                                                                                                         Vec4(0.4f, 0.5f, 0.6f, 0.7f),
 335                                                                                                         Vec4(0.8f, 0.9f, 1.0f, 1.1f),
 336                                                                                                         Vec4(1.2f, 1.3f, 1.4f, 1.5f)));
 337
 338         m_attributes.push_back(AttribSpec("a_value1",   Vec4(0.0f, 0.1f, 0.2f, 0.3f),
 339                                                                                                         Vec4(0.4f, 0.5f, 0.6f, 0.7f),
 340                                                                                                         Vec4(0.8f, 0.9f, 1.0f, 1.1f),
 341                                                                                                         Vec4(1.2f, 1.3f, 1.4f, 1.5f)));
 342
 343         ControlStatementCase::init();
 344 }
 345
 346 void ConditionalCase::setupProgram (deUint32 program)
 347 {
 348         const glw::Functions& gl = m_renderCtx.getFunctions();
 349
 350         if (m_decisionType == DECISION_UNIFORM)
 351         {
 352                 int location = gl.getUniformLocation(program, "u_compareValue");
 353                 gl.uniform1f(location, m_branchType == BRANCH_TRUE ? +1.0f : -1.0f);
 354         }
 355         else if (m_decisionType == DECISION_ATTRIBUTE && m_branchType == BRANCH_MIXED && m_caseType == CASETYPE_VERTEX)
 356         {
 357                 // Setup per-vertex comparison values calculated in init().
 358
 359                 const int       numComponents                   = 4;
 360                 int                     compareAttribLocation   = gl.getAttribLocation(program, "a_compareValue");
 361
 362                 DE_ASSERT((int)m_comparisonValueArray.size() == numComponents * (getGridWidth() + 1) * (getGridHeight() + 1));
 363
 364                 gl.genBuffers(1, &m_arrayBuffer);
 365                 gl.bindBuffer(GL_ARRAY_BUFFER, m_arrayBuffer);
 366                 gl.bufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(m_comparisonValueArray.size()*sizeof(float)), &m_comparisonValueArray[0], GL_STATIC_DRAW);
 367                 gl.enableVertexAttribArray(compareAttribLocation);
 368                 gl.vertexAttribPointer(compareAttribLocation, (GLint)numComponents, GL_FLOAT, GL_FALSE, 0, DE_NULL);
 369         }
 370
 371         GLU_EXPECT_NO_ERROR(gl.getError(), "Setup program state");
 372 }
 373
 374 ConditionalCase::~ConditionalCase (void)
 375 {
 376         const glw::Functions& gl = m_renderCtx.getFunctions();
 377
 378         if (m_arrayBuffer != 0)
 379         {
 380                 gl.deleteBuffers(1, &m_arrayBuffer);
 381                 m_arrayBuffer = 0;
 382         }
 383 }
 384
 385 void ConditionalCase::deinit (void)
 386 {
 387         const glw::Functions& gl = m_renderCtx.getFunctions();
 388
 389         m_comparisonValueArray.clear();
 390
 391         if (m_arrayBuffer != 0)
 392         {
 393                 gl.deleteBuffers(1, &m_arrayBuffer);
 394                 m_arrayBuffer = 0;
 395         }
 396
 397         ShaderPerformanceCase::deinit();
 398 }
 399
 400 class LoopCase : public ControlStatementCase
 401 {
 402 public:
 403         enum LoopType
 404         {
 405                 LOOP_FOR = 0,
 406                 LOOP_WHILE,
 407                 LOOP_DO_WHILE,
 408
 409                 LOOP_LAST
 410         };
 411                                         LoopCase                        (Context& context, const char* name, const char* description, LoopType type, DecisionType decisionType, bool isLoopBoundStable, bool isVertex);
 412                                         ~LoopCase                       (void);
 413
 414         void                    init                            (void);
 415         void                    deinit                          (void);
 416         void                    setupProgram            (deUint32 program);
 417
 418 private:
 419         DecisionType    m_decisionType;
 420         LoopType                m_type;
 421
 422         bool                    m_isLoopBoundStable;    // Whether loop bound is same in all executions.
 423         vector<float>   m_boundArray;                   // Will contain per-vertex loop bounds if using non-stable attribute in vertex case.
 424         deUint32                m_arrayBuffer;
 425 };
 426
 427 LoopCase::LoopCase (Context& context, const char* name, const char* description, LoopType type, DecisionType decisionType, bool isLoopBoundStable, bool isVertex)
 428         : ControlStatementCase  (context.getTestContext(), context.getRenderContext(), name, description, isVertex ? CASETYPE_VERTEX : CASETYPE_FRAGMENT)
 429         , m_decisionType                (decisionType)
 430         , m_type                                (type)
 431         , m_isLoopBoundStable   (isLoopBoundStable)
 432         , m_arrayBuffer                 (0)
 433 {
 434 }
 435
 436 void LoopCase::init (void)
 437 {
 438         bool                            isVertexCase    = m_caseType == CASETYPE_VERTEX;
 439
 440         bool                            isStaticCase    = m_decisionType == DECISION_STATIC;
 441         bool                            isUniformCase   = m_decisionType == DECISION_UNIFORM;
 442         bool                            isAttributeCase = m_decisionType == DECISION_ATTRIBUTE;
 443
 444         DE_ASSERT(isStaticCase || isUniformCase || isAttributeCase);
 445
 446         DE_ASSERT(m_type == LOOP_FOR            ||
 447                           m_type == LOOP_WHILE          ||
 448                           m_type == LOOP_DO_WHILE);
 449
 450         DE_ASSERT(isAttributeCase || m_isLoopBoundStable); // The loop bound count can vary between executions only if using attribute input.
 451
 452         // \note The fractional part is .5 (instead of .0) so that these can be safely used as loop bounds.
 453         const float                     loopBound                               = 10.5f;
 454         const float                     unstableBoundLow                = 5.5f;
 455         const float                     unstableBoundHigh               = 15.5f;
 456         static const char*      loopBoundStr                    = "10.5";
 457         static const char*      unstableBoundLowStr             = "5.5";
 458         static const char*      unstableBoundHighStr    = "15.5";
 459
 460         const char*                     boundValueStr           = isStaticCase                  ? loopBoundStr :
 461                                                                                           isUniformCase                 ? "u_bound" :
 462                                                                                           isVertexCase                  ? "a_bound" :
 463                                                                                           m_isLoopBoundStable   ? "v_bound" :
 464                                                                                                                                           "loopBound";
 465
 466         std::ostringstream      vtx;
 467         std::ostringstream      frag;
 468         std::ostringstream&     op              = isVertexCase ? vtx : frag;
 469
 470         vtx << "attribute highp vec4 a_position;\n";    // Position attribute.
 471         vtx << "attribute mediump vec4 a_value;\n";             // Input for workload calculations.
 472
 473         // Value to be used as the loop iteration count.
 474         if (isAttributeCase)
 475                 vtx << "attribute mediump float a_bound;\n";
 476         else if (isUniformCase)
 477                 op << "uniform mediump float u_bound;\n";
 478
 479         // Varyings.
 480         if (isVertexCase)
 481         {
 482                 vtx << "varying mediump vec4 v_color;\n";
 483                 frag << "varying mediump vec4 v_color;\n";
 484         }
 485         else
 486         {
 487                 vtx << "varying mediump vec4 v_value;\n";
 488                 frag << "varying mediump vec4 v_value;\n";
 489
 490                 if (isAttributeCase)
 491                 {
 492                         vtx << "varying mediump float v_bound;\n";
 493                         frag << "varying mediump float v_bound;\n";
 494                 }
 495         }
 496
 497         vtx << "\n";
 498         vtx << "void main()\n";
 499         vtx << "{\n";
 500         vtx << "        gl_Position = a_position;\n";
 501
 502         frag << "\n";
 503         frag << "void main()\n";
 504         frag << "{\n";
 505
 506         op << " mediump vec4 res = vec4(0.0);\n";
 507
 508         if (!m_isLoopBoundStable && !isVertexCase)
 509         {
 510                 // Choose the actual loop bound based on v_bound.
 511                 // \note Loop bound will vary with high frequency between fragment columns, given appropriate range for v_bound.
 512                 op << " mediump float loopBound = fract(v_bound) < 0.5 ? " << unstableBoundLowStr << " : " << unstableBoundHighStr << ";\n";
 513         }
 514
 515         // Start a for, while or do-while loop.
 516         if (m_type == LOOP_FOR)
 517                 op << " for (mediump float i = 0.0; i < " << boundValueStr << "; i++)\n";
 518         else
 519         {
 520                 op << " mediump float i = 0.0;\n";
 521                 if (m_type == LOOP_WHILE)
 522                         op << " while (i < " << boundValueStr << ")\n";
 523                 else // LOOP_DO_WHILE
 524                         op << " do\n";
 525         }
 526         op << " {\n";
 527
 528         // Workload calculations inside the loop.
 529         op << "\t\t";
 530         writeLoopWorkload(op, "res", isVertexCase ? "a_value" : "v_value");
 531         op << "\n";
 532
 533         // Only "for" has counter increment in the loop head.
 534         if (m_type != LOOP_FOR)
 535                 op << "         i++;\n";
 536
 537         // End the loop.
 538         if (m_type == LOOP_DO_WHILE)
 539                 op << " } while (i < " << boundValueStr << ");\n";
 540         else
 541                 op << " }\n";
 542
 543         if (isVertexCase)
 544         {
 545                 // Put result to color variable.
 546                 vtx << "        v_color = res;\n";
 547                 frag << "       gl_FragColor = v_color;\n";
 548         }
 549         else
 550         {
 551                 // Transfer inputs to fragment shader through varyings.
 552                 if (isAttributeCase)
 553                         vtx << "        v_bound = a_bound;\n";
 554                 vtx << "        v_value = a_value;\n";
 555
 556                 frag << "       gl_FragColor = res;\n"; // Put result to color variable.
 557         }
 558
 559         vtx << "}\n";
 560         frag << "}\n";
 561
 562         m_vertShaderSource = vtx.str();
 563         m_fragShaderSource = frag.str();
 564
 565         if (isAttributeCase)
 566         {
 567                 if (m_isLoopBoundStable)
 568                 {
 569                         // Every execution has same number of iterations.
 570
 571                         m_attributes.push_back(AttribSpec("a_bound",    Vec4(loopBound, 0.0f, 0.0f, 0.0f),
 572                                                                                                                         Vec4(loopBound, 0.0f, 0.0f, 0.0f),
 573                                                                                                                         Vec4(loopBound, 0.0f, 0.0f, 0.0f),
 574                                                                                                                         Vec4(loopBound, 0.0f, 0.0f, 0.0f)));
 575                 }
 576                 else if (isVertexCase)
 577                 {
 578                         // Vertex case, with non-constant number of iterations.
 579
 580                         const int       numComponents   = 4;
 581                         int                     numVertices             = (getGridWidth() + 1) * (getGridHeight() + 1);
 582
 583                         // setupProgram() will later bind this array as an attribute.
 584                         m_boundArray.resize(numVertices * numComponents);
 585
 586                         // Vary between low and high loop bounds; they should average to loopBound however.
 587                         for (int i = 0; i < (int)m_boundArray.size(); i++)
 588                         {
 589                                 if (i % numComponents == 0)
 590                                         m_boundArray[i] = (i / numComponents) % 2 == 0 ? unstableBoundLow : unstableBoundHigh;
 591                                 else
 592                                         m_boundArray[i] = 0.0f;
 593                         }
 594                 }
 595                 else // !m_isLoopBoundStable && !isVertexCase
 596                 {
 597                         // Fragment case, with non-constant number of iterations.
 598                         // \note fract(a_bound) < 0.5 will be true for every second fragment.
 599
 600                         float minValue = 0.0f;
 601                         float maxValue = (float)getViewportWidth()*0.5f;
 602                         m_attributes.push_back(AttribSpec("a_bound",    Vec4(minValue, 0.0f, 0.0f, 0.0f),
 603                                                                                                                         Vec4(maxValue, 0.0f, 0.0f, 0.0f),
 604                                                                                                                         Vec4(minValue, 0.0f, 0.0f, 0.0f),
 605                                                                                                                         Vec4(maxValue, 0.0f, 0.0f, 0.0f)));
 606                 }
 607         }
 608
 609         m_attributes.push_back(AttribSpec("a_value",    Vec4(0.0f, 0.1f, 0.2f, 0.3f),
 610                                                                                                         Vec4(0.4f, 0.5f, 0.6f, 0.7f),
 611                                                                                                         Vec4(0.8f, 0.9f, 1.0f, 1.1f),
 612                                                                                                         Vec4(1.2f, 1.3f, 1.4f, 1.5f)));
 613
 614         ControlStatementCase::init();
 615 }
 616
 617 void LoopCase::setupProgram (deUint32 program)
 618 {
 619         const glw::Functions& gl = m_renderCtx.getFunctions();
 620
 621         if (m_decisionType == DECISION_UNIFORM)
 622         {
 623                 const float loopBound = 10.5f;
 624
 625                 int location = gl.getUniformLocation(program, "u_bound");
 626                 gl.uniform1f(location, loopBound);
 627         }
 628         else if (m_decisionType == DECISION_ATTRIBUTE && !m_isLoopBoundStable && m_caseType == CASETYPE_VERTEX)
 629         {
 630                 // Setup per-vertex loop bounds calculated in init().
 631
 632                 const int       numComponents           = 4;
 633                 int                     boundAttribLocation     = gl.getAttribLocation(program, "a_bound");
 634
 635                 DE_ASSERT((int)m_boundArray.size() == numComponents * (getGridWidth() + 1) * (getGridHeight() + 1));
 636
 637                 gl.genBuffers(1, &m_arrayBuffer);
 638                 gl.bindBuffer(GL_ARRAY_BUFFER, m_arrayBuffer);
 639                 gl.bufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(m_boundArray.size()*sizeof(float)), &m_boundArray[0], GL_STATIC_DRAW);
 640                 gl.enableVertexAttribArray(boundAttribLocation);
 641                 gl.vertexAttribPointer(boundAttribLocation, (GLint)numComponents, GL_FLOAT, GL_FALSE, 0, DE_NULL);
 642         }
 643
 644         GLU_EXPECT_NO_ERROR(gl.getError(), "Setup program state");
 645 }
 646
 647 LoopCase::~LoopCase (void)
 648 {
 649         const glw::Functions& gl = m_renderCtx.getFunctions();
 650
 651         if (m_arrayBuffer)
 652         {
 653                 gl.deleteBuffers(1, &m_arrayBuffer);
 654                 m_arrayBuffer = 0;
 655         }
 656 }
 657
 658 void LoopCase::deinit (void)
 659 {
 660         const glw::Functions& gl = m_renderCtx.getFunctions();
 661
 662         m_boundArray.clear();
 663
 664         if (m_arrayBuffer)
 665         {
 666                 gl.deleteBuffers(1, &m_arrayBuffer);
 667                 m_arrayBuffer = 0;
 668         }
 669
 670         ShaderPerformanceCase::deinit();
 671 }
 672
 673 // A reference case, same calculations as the actual tests but without control statements.
 674 class WorkloadReferenceCase : public ControlStatementCase
 675 {
 676 public:
 677                                                         WorkloadReferenceCase           (Context& context, const char* name, const char* description, bool isVertex);
 678
 679         void                                    init                                            (void);
 680
 681 protected:
 682         virtual void                    writeWorkload                           (std::ostringstream& dst, const char* resultVariableName, const char* inputVariableName) const = 0;
 683 };
 684
 685 WorkloadReferenceCase::WorkloadReferenceCase (Context& context, const char* name, const char* description, bool isVertex)
 686         : ControlStatementCase(context.getTestContext(), context.getRenderContext(), name, description, isVertex ? CASETYPE_VERTEX : CASETYPE_FRAGMENT)
 687 {
 688 }
 689
 690 void WorkloadReferenceCase::init (void)
 691 {
 692         bool isVertexCase = m_caseType == CASETYPE_VERTEX;
 693
 694         std::ostringstream      vtx;
 695         std::ostringstream      frag;
 696         std::ostringstream&     op                      = isVertexCase ? vtx : frag;
 697
 698         vtx << "attribute highp vec4 a_position;\n";    // Position attribute.
 699         vtx << "attribute mediump vec4 a_value;\n";             // Value for workload calculations.
 700
 701         // Varyings.
 702         if (isVertexCase)
 703         {
 704                 vtx << "varying mediump vec4 v_color;\n";
 705                 frag << "varying mediump vec4 v_color;\n";
 706         }
 707         else
 708         {
 709                 vtx << "varying mediump vec4 v_value;\n";
 710                 frag << "varying mediump vec4 v_value;\n";
 711         }
 712
 713         vtx << "\n";
 714         vtx << "void main()\n";
 715         vtx << "{\n";
 716         vtx << "        gl_Position = a_position;\n";
 717
 718         frag << "\n";
 719         frag << "void main()\n";
 720         frag << "{\n";
 721
 722         op << "\tmediump vec4 res;\n";
 723         writeWorkload(op, "res", isVertexCase ? "a_value" : "v_value");
 724
 725         if (isVertexCase)
 726         {
 727                 // Put result to color variable.
 728                 vtx << "        v_color = res;\n";
 729                 frag << "       gl_FragColor = v_color;\n";
 730         }
 731         else
 732         {
 733                 vtx << "        v_value = a_value;\n";  // Transfer input to fragment shader through varying.
 734                 frag << "       gl_FragColor = res;\n"; // Put result to color variable.
 735         }
 736
 737         vtx << "}\n";
 738         frag << "}\n";
 739
 740         m_vertShaderSource = vtx.str();
 741         m_fragShaderSource = frag.str();
 742
 743         m_attributes.push_back(AttribSpec("a_value",    Vec4(0.0f, 0.1f, 0.2f, 0.3f),
 744                                                                                                         Vec4(0.4f, 0.5f, 0.6f, 0.7f),
 745                                                                                                         Vec4(0.8f, 0.9f, 1.0f, 1.1f),
 746                                                                                                         Vec4(1.2f, 1.3f, 1.4f, 1.5f)));
 747
 748         ControlStatementCase::init();
 749 }
 750
 751 class LoopWorkloadReferenceCase : public WorkloadReferenceCase
 752 {
 753 public:
 754         LoopWorkloadReferenceCase (Context& context, const char* name, const char* description, bool isAttributeStable, bool isVertex)
 755                 : WorkloadReferenceCase         (context, name, description, isVertex)
 756                 , m_isAttributeStable           (isAttributeStable)
 757         {
 758         }
 759
 760 protected:
 761         void writeWorkload (std::ostringstream& dst, const char* resultVariableName, const char* inputVariableName) const;
 762
 763 private:
 764         bool m_isAttributeStable;
 765 };
 766
 767 void LoopWorkloadReferenceCase::writeWorkload (std::ostringstream& dst, const char* resultVariableName, const char* inputVariableName) const
 768 {
 769         const int       loopIterations  = 11;
 770         bool            isVertexCase    = m_caseType == CASETYPE_VERTEX;
 771
 772         dst << "\t" << resultVariableName << " = vec4(0.0);\n";
 773
 774         for (int i = 0; i < loopIterations; i++)
 775         {
 776                 dst << "\t";
 777                 writeLoopWorkload(dst, resultVariableName, inputVariableName);
 778                 dst << "\n";
 779         }
 780
 781         if (!isVertexCase && !m_isAttributeStable)
 782         {
 783                 // Corresponds to the fract() done in a real test's fragment case with non-stable attribute.
 784                 dst << "        res.x = fract(res.x);\n";
 785         }
 786 }
 787
 788 class ConditionalWorkloadReferenceCase : public WorkloadReferenceCase
 789 {
 790 public:
 791         ConditionalWorkloadReferenceCase (Context& context, const char* name, const char* description, bool isAttributeStable, bool isVertex)
 792                 : WorkloadReferenceCase         (context, name, description, isVertex)
 793                 , m_isAttributeStable           (isAttributeStable)
 794         {
 795         }
 796
 797 protected:
 798         void writeWorkload (std::ostringstream& dst, const char* resultVariableName, const char* inputVariableName) const;
 799
 800 private:
 801         bool m_isAttributeStable;
 802 };
 803
 804 void ConditionalWorkloadReferenceCase::writeWorkload (std::ostringstream& dst, const char* resultVariableName, const char* inputVariableName) const
 805 {
 806         bool isVertexCase = m_caseType == CASETYPE_VERTEX;
 807
 808         dst << "\t";
 809         writeConditionalWorkload(dst, resultVariableName, inputVariableName);
 810         dst << "\n";
 811
 812         if (!isVertexCase && !m_isAttributeStable)
 813         {
 814                 // Corresponds to the fract() done in a real test's fragment case with non-stable attribute.
 815                 dst << "        res.x = fract(res.x);\n";
 816         }
 817 }
 818
 819 // A workload reference case for e.g. a conditional case with a branch with no computation.
 820 class EmptyWorkloadReferenceCase : public WorkloadReferenceCase
 821 {
 822 public:
 823         EmptyWorkloadReferenceCase      (Context& context, const char* name, const char* description, bool isVertex)
 824                 : WorkloadReferenceCase (context, name, description, isVertex)
 825         {
 826         }
 827
 828 protected:
 829         void writeWorkload (std::ostringstream& dst, const char* resultVariableName, const char* inputVariableName) const
 830         {
 831                 dst << "\t" << resultVariableName << " = " << inputVariableName << ";\n";
 832         }
 833 };
 834
 835 ShaderControlStatementTests::ShaderControlStatementTests (Context& context)
 836         : TestCaseGroup(context, "control_statement", "Control Statement Performance Tests")
 837 {
 838 }
 839
 840 ShaderControlStatementTests::~ShaderControlStatementTests (void)
 841 {
 842 }
 843
 844 void ShaderControlStatementTests::init (void)
 845 {
 846         // Conditional cases (if-else).
 847
 848         tcu::TestCaseGroup* ifElseGroup = new tcu::TestCaseGroup(m_testCtx, "if_else", "if-else Conditional Performance Tests");
 849         addChild(ifElseGroup);
 850
 851         for (int isFrag = 0; isFrag <= 1; isFrag++)
 852         {
 853                 bool isVertex = isFrag == 0;
 854                 ShaderPerformanceCaseGroup* vertexOrFragmentGroup = new ShaderPerformanceCaseGroup(m_testCtx, isVertex ? "vertex" : "fragment", "");
 855                 ifElseGroup->addChild(vertexOrFragmentGroup);
 856
 857                 DE_STATIC_ASSERT(DECISION_STATIC == 0);
 858                 for (int decisionType = (int)DECISION_STATIC; decisionType < (int)DECISION_LAST; decisionType++)
 859                 {
 860                         const char* decisionName = decisionType == (int)DECISION_STATIC         ? "static" :
 861                                                                                 decisionType == (int)DECISION_UNIFORM   ? "uniform" :
 862                                                                                 decisionType == (int)DECISION_ATTRIBUTE ? (isVertex ? "attribute" : "varying") :
 863                                                                                                                                                                         DE_NULL;
 864                         DE_ASSERT(decisionName != DE_NULL);
 865
 866                         for (int workloadDivision = 0; workloadDivision < ConditionalCase::WORKLOAD_DIVISION_LAST; workloadDivision++)
 867                         {
 868                                 const char* workloadDivisionSuffix = workloadDivision == (int)ConditionalCase::WORKLOAD_DIVISION_EVEN                   ? "" :
 869                                                                                                          workloadDivision == (int)ConditionalCase::WORKLOAD_DIVISION_TRUE_HEAVY         ? "_with_heavier_true" :
 870                                                                                                          workloadDivision == (int)ConditionalCase::WORKLOAD_DIVISION_FALSE_HEAVY        ? "_with_heavier_false" :
 871                                                                                                                                                                                                                                                                   DE_NULL;
 872                                 DE_ASSERT(workloadDivisionSuffix != DE_NULL);
 873
 874                                 DE_STATIC_ASSERT(ConditionalCase::BRANCH_TRUE == 0);
 875                                 for (int branchResult = (int)ConditionalCase::BRANCH_TRUE; branchResult < (int)ConditionalCase::BRANCH_LAST; branchResult++)
 876                                 {
 877                                         if (decisionType != (int)DECISION_ATTRIBUTE && branchResult == (int)ConditionalCase::BRANCH_MIXED)
 878                                                 continue;
 879
 880                                         const char* branchResultName = branchResult == (int)ConditionalCase::BRANCH_TRUE        ? "true" :
 881                                                                                                    branchResult == (int)ConditionalCase::BRANCH_FALSE   ? "false" :
 882                                                                                                    branchResult == (int)ConditionalCase::BRANCH_MIXED   ? "mixed" :
 883                                                                                                                                                                                                                   DE_NULL;
 884                                         DE_ASSERT(branchResultName != DE_NULL);
 885
 886                                         string caseName = string("") + decisionName + "_" + branchResultName + workloadDivisionSuffix;
 887
 888                                         vertexOrFragmentGroup->addChild(new ConditionalCase(m_context, caseName.c_str(), "",
 889                                                                                                                                                 (DecisionType)decisionType, (ConditionalCase::BranchResult)branchResult,
 890                                                                                                                                                 (ConditionalCase::WorkloadDivision)workloadDivision, isVertex));
 891                                 }
 892                         }
 893                 }
 894
 895                 if (isVertex)
 896                         vertexOrFragmentGroup->addChild(new ConditionalWorkloadReferenceCase(m_context, "reference", "", true, isVertex));
 897                 else
 898                 {
 899                         // Only fragment case with BRANCH_MIXED has an additional fract() call.
 900                         vertexOrFragmentGroup->addChild(new ConditionalWorkloadReferenceCase(m_context, "reference_unmixed", "", true, isVertex));
 901                         vertexOrFragmentGroup->addChild(new ConditionalWorkloadReferenceCase(m_context, "reference_mixed", "", false, isVertex));
 902                 }
 903
 904                 vertexOrFragmentGroup->addChild(new EmptyWorkloadReferenceCase(m_context, "reference_empty", "", isVertex));
 905         }
 906
 907         // Loop cases.
 908
 909         static const struct
 910         {
 911                 LoopCase::LoopType      type;
 912                 const char*                     name;
 913                 const char*                     description;
 914         } loopGroups[] =
 915         {
 916                 {LoopCase::LOOP_FOR,            "for",          "for Loop Performance Tests"},
 917                 {LoopCase::LOOP_WHILE,          "while",        "while Loop Performance Tests"},
 918                 {LoopCase::LOOP_DO_WHILE,       "do_while",     "do-while Loop Performance Tests"}
 919         };
 920
 921         for (int groupNdx = 0; groupNdx < DE_LENGTH_OF_ARRAY(loopGroups); groupNdx++)
 922         {
 923                 tcu::TestCaseGroup* currentLoopGroup = new tcu::TestCaseGroup(m_testCtx, loopGroups[groupNdx].name, loopGroups[groupNdx].description);
 924                 addChild(currentLoopGroup);
 925
 926                 for (int isFrag = 0; isFrag <= 1; isFrag++)
 927                 {
 928                         bool isVertex = isFrag == 0;
 929                         ShaderPerformanceCaseGroup* vertexOrFragmentGroup = new ShaderPerformanceCaseGroup(m_testCtx, isVertex ? "vertex" : "fragment", "");
 930                         currentLoopGroup->addChild(vertexOrFragmentGroup);
 931
 932                         DE_STATIC_ASSERT(DECISION_STATIC == 0);
 933                         for (int decisionType = (int)DECISION_STATIC; decisionType < (int)DECISION_LAST; decisionType++)
 934                         {
 935                                 const char* decisionName = decisionType == (int)DECISION_STATIC         ? "static" :
 936                                                                                    decisionType == (int)DECISION_UNIFORM        ? "uniform" :
 937                                                                                    decisionType == (int)DECISION_ATTRIBUTE      ? (isVertex ? "attribute" : "varying") :
 938                                                                                                                                                                           DE_NULL;
 939                                 DE_ASSERT(decisionName != DE_NULL);
 940
 941                                 if (decisionType == (int)DECISION_ATTRIBUTE)
 942                                 {
 943                                         vertexOrFragmentGroup->addChild(new LoopCase(m_context, (string(decisionName) + "_stable").c_str(), "", loopGroups[groupNdx].type, (DecisionType)decisionType, true, isVertex));
 944                                         vertexOrFragmentGroup->addChild(new LoopCase(m_context, (string(decisionName) + "_unstable").c_str(), "", loopGroups[groupNdx].type, (DecisionType)decisionType, false, isVertex));
 945                                 }
 946                                 else
 947                                         vertexOrFragmentGroup->addChild(new LoopCase(m_context, decisionName, "", loopGroups[groupNdx].type, (DecisionType)decisionType, true, isVertex));
 948
 949                         }
 950
 951                         if (isVertex)
 952                                 vertexOrFragmentGroup->addChild(new LoopWorkloadReferenceCase(m_context, "reference", "", true, isVertex));
 953                         else
 954                         {
 955                                 // Only fragment case with unstable attribute has an additional fract() call.
 956                                 vertexOrFragmentGroup->addChild(new LoopWorkloadReferenceCase(m_context, "reference_stable", "", true, isVertex));
 957                                 vertexOrFragmentGroup->addChild(new LoopWorkloadReferenceCase(m_context, "reference_unstable", "", false, isVertex));
 958                         }
 959                 }
 960         }
 961 }
 962
 963 } // Performance
 964 } // gles2
 965 } // deqp