kc3-lang/angle/src/tests/compiler_tests/RecordConstantPrecision_test.cpp

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• Author : Jamie Madill
  Date : 2016-11-07 13:58:48
  Hash : 45bcc784
  Message : translator: Scope all classes with "sh". I was seeing an odd problem with our PoolAlloc conflicting with the glslang/Vulkan TIntermNode, so the fix was to move everything to a separate namespace. The bison grammars are also regenerated. No functional changes. BUG=angleproject:1576 Change-Id: I959c7afe4c092f0d458432c07b4dcee4d39513f3 Reviewed-on: https://chromium-review.googlesource.com/408267 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• src/tests/compiler_tests/RecordConstantPrecision_test.cpp

• //
  // Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // RecordConstantPrecision_test.cpp:
  //   Test for recording constant variable precision when it affects consuming expression.
  //
  
  #include "angle_gl.h"
  #include "gtest/gtest.h"
  #include "GLSLANG/ShaderLang.h"
  #include "tests/test_utils/compiler_test.h"
  
  using namespace sh;
  
  class RecordConstantPrecisionTest : public MatchOutputCodeTest
  {
    public:
      RecordConstantPrecisionTest() : MatchOutputCodeTest(GL_FRAGMENT_SHADER, 0, SH_ESSL_OUTPUT) {}
  };
  
  // The constant cannot be folded if its precision is higher than the other operands, since it
  // increases the precision of the consuming expression.
  TEST_F(RecordConstantPrecisionTest, HigherPrecisionConstantAsParameter)
  {
      const std::string &shaderString =
          "uniform mediump float u;"
          "void main()\n"
          "{\n"
          "    const highp float a = 4096.5;\n"
          "    mediump float b = fract(a + u);\n"
          "    gl_FragColor = vec4(b);\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(foundInCode("const highp float webgl_angle_s"));
      ASSERT_FALSE(foundInCode("fract(4096.5"));
      ASSERT_FALSE(foundInCode("fract((4096.5"));
  }
  
  // The constant can be folded if its precision is equal to the other operands, as it does not
  // increase the precision of the consuming expression.
  TEST_F(RecordConstantPrecisionTest, EqualPrecisionConstantAsParameter)
  {
      const std::string &shaderString =
          "uniform mediump float u;"
          "void main()\n"
          "{\n"
          "    const mediump float a = 4096.5;\n"
          "    mediump float b = fract(a + u);\n"
          "    gl_FragColor = vec4(b);\n"
          "}\n";
      compile(shaderString);
      ASSERT_FALSE(foundInCode("const mediump float webgl_angle_s"));
      ASSERT_TRUE(foundInCode("fract((4096.5"));
  }
  
  // The constant cannot be folded if its precision is higher than the other operands, since it
  // increases the precision of the consuming expression. This applies also when the constant is
  // part of a constant expression that can be folded.
  TEST_F(RecordConstantPrecisionTest, FoldedBinaryConstantPrecisionIsHigher)
  {
      const std::string &shaderString =
          "uniform mediump float u;"
          "void main()\n"
          "{\n"
          "    const highp float a = 4095.5;\n"
          "    mediump float b = fract((a + 1.0) + u);\n"
          "    gl_FragColor = vec4(b);\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(foundInCode("const highp float webgl_angle_s"));
      ASSERT_FALSE(foundInCode("fract(4096.5"));
      ASSERT_FALSE(foundInCode("fract((4096.5"));
  }
  
  
  // The constant cannot be folded if its precision is higher than the other operands, since it
  // increases the precision of the consuming expression. This applies also when the constant is
  // part of a constant expression that can be folded.
  TEST_F(RecordConstantPrecisionTest, FoldedUnaryConstantPrecisionIsHigher)
  {
      const std::string &shaderString =
          "uniform mediump float u;"
          "void main()\n"
          "{\n"
          "    const highp float a = 0.5;\n"
          "    mediump float b = sin(fract(a) + u);\n"
          "    gl_FragColor = vec4(b);\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(foundInCode("const highp float webgl_angle_s"));
      ASSERT_FALSE(foundInCode("sin(0.5"));
      ASSERT_FALSE(foundInCode("sin((0.5"));
  }