kc3-lang/angle/src/tests/gl_tests/ShaderNonConstGlobalInitializerTest.cpp

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• Author : Mohan Maiya
  Date : 2020-03-19 16:30:21
  Hash : ca2b6e1f
  Message : Vulkan: Implement EXT_shader_non_constant_global_initializers Enables the translator to handle non-constant global initializers in all essl versions iff the shader enables the extension to do so. Bug: angleproject:4468 Test: angle_end2end_tests --gtest_filter=ShaderNonConstGlobalInitializerTest.* Change-Id: I8f138c12fc83d2f38ff8f45ca9133222b01e4087 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2102959 Reviewed-by: Tobin Ehlis <tobine@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Mohan Maiya <m.maiya@samsung.com>

• src/tests/gl_tests/ShaderNonConstGlobalInitializerTest.cpp

• //
  // Copyright 2020 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.
  //
  // Tests for GL_EXT_shader_non_constant_global_initializers
  //
  
  #include "common/mathutil.h"
  #include "test_utils/ANGLETest.h"
  #include "test_utils/gl_raii.h"
  
  using namespace angle;
  
  class ShaderNonConstGlobalInitializerTest : public ANGLETest
  {
    protected:
      ShaderNonConstGlobalInitializerTest() : ANGLETest()
      {
          setWindowWidth(128);
          setWindowHeight(128);
      }
  
      void draw(GLuint program)
      {
          std::array<Vector4, 3> vertices;
          vertices[0] = {-1.0, -1.0, 0.0, 1.0};
          vertices[1] = {1.0, -1.0, 0.0, 1.0};
          vertices[2] = {0.0, 1.0, 0.0, 2.0};
  
          GLint positionLocation = glGetAttribLocation(program, "a_position");
  
          glVertexAttribPointer(positionLocation, 4, GL_FLOAT, GL_FALSE, 0, vertices.data());
  
          glEnableVertexAttribArray(positionLocation);
  
          glDrawArrays(GL_TRIANGLES, 0, 3);
      }
  };
  
  // Tests that the extension is disabled if not explicitly enabled- non constant initializers should
  // be forbidden in all cases unless this extension is explicitly requested
  TEST_P(ShaderNonConstGlobalInitializerTest, Disabled)
  {
      const char *fragSrc = R"(#version 100
  
  precision lowp float;
  
  uniform float nondeterministic_uniform;
  
  float nonConstInitializer();
  
  float nonConstGlobal = nonConstInitializer();
  float sideEffectGlobal = 0.0;
  
  float nonConstInitializer() {
      sideEffectGlobal = 1.0;
      return nondeterministic_uniform;
  }
  
  void main()
  {
      gl_FragColor = vec4(nondeterministic_uniform, nonConstGlobal, sideEffectGlobal, 1.0);
  }
  )";
  
      GLShader badFragment(GL_FRAGMENT_SHADER);
      glShaderSource(badFragment, 1, &fragSrc, nullptr);
      glCompileShader(badFragment);
  
      GLint compileResult;
      glGetShaderiv(badFragment, GL_COMPILE_STATUS, &compileResult);
      EXPECT_EQ(compileResult, 0);
  
      EXPECT_GL_NO_ERROR();
  }
  
  // Test that non constant initializers are evaluated correctly in ESSL 100
  TEST_P(ShaderNonConstGlobalInitializerTest, v100)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_shader_non_constant_global_initializers"));
  
      const char *fragSrc = R"(#version 100
  #extension GL_EXT_shader_non_constant_global_initializers : require
  
  precision lowp float;
  
  #ifndef GL_EXT_shader_non_constant_global_initializers
  #error GL_EXT_shader_non_constant_global_initializers is not defined
  #endif
  
  uniform float nondeterministic_uniform;
  
  float nonConstInitializer();
  
  float nonConstGlobal = nonConstInitializer();
  float sideEffectGlobal = 0.0;
  
  float nonConstInitializer() {
      sideEffectGlobal = 1.0;
      return nondeterministic_uniform;
  }
  
  void main()
  {
      gl_FragColor = vec4(nondeterministic_uniform, nonConstGlobal, sideEffectGlobal, 1.0);
  }
  )";
  
      ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), fragSrc);
      EXPECT_GL_NO_ERROR();
  
      glUseProgram(program);
      glUniform1f(glGetUniformLocation(program, "nondeterministic_uniform"), 1.0f);
      ASSERT_GL_NO_ERROR();
  
      draw(program);
      EXPECT_GL_NO_ERROR();
  
      EXPECT_PIXEL_COLOR_EQ(64, 64, GLColor::white);
  }
  
  // Test that non constant initializers are evaluated correctly in ESSL 300
  TEST_P(ShaderNonConstGlobalInitializerTest, v300es)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_shader_non_constant_global_initializers"));
  
      const char *fragSrc = R"(#version 300 es
  #extension GL_EXT_shader_non_constant_global_initializers : require
  
  precision highp float;
  out vec4 fragColor;
  
  #ifndef GL_EXT_shader_non_constant_global_initializers
  #error GL_EXT_shader_non_constant_global_initializers is not defined
  #endif
  
  uniform float nondeterministic_uniform;
  
  float nonConstInitializer();
  
  float nonConstGlobal = nonConstInitializer();
  float sideEffectGlobal = 0.0;
  
  float nonConstInitializer() {
      sideEffectGlobal = 1.0;
      return nondeterministic_uniform;
  }
  
  void main()
  {
      fragColor = vec4(nondeterministic_uniform, nonConstGlobal, sideEffectGlobal, 1.0);
  }
  )";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), fragSrc);
      EXPECT_GL_NO_ERROR();
  
      glUseProgram(program);
      glUniform1f(glGetUniformLocation(program, "nondeterministic_uniform"), 1.0f);
      ASSERT_GL_NO_ERROR();
  
      draw(program);
      EXPECT_GL_NO_ERROR();
  
      EXPECT_PIXEL_COLOR_EQ(64, 64, GLColor::white);
  }
  
  ANGLE_INSTANTIATE_TEST_ES3(ShaderNonConstGlobalInitializerTest);