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

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• Hash : 25390156
  Author :
  Date : 2025-08-21T00:13:19
  

  Suppress unsafe buffers on a file-by-file basis in src/ [1 of N]
  
  In this CL, we suppress many files but stop short of actually
  enabling the warning by not removing the line from the
  unsafe_buffers_paths.txt file. That will happen in a follow-on
  CL, along with resolving any stragglers missed here.
  
  This is mostly a manual change so as to familiarize myself with
  the kinds of issues faced by the Angle codebase when applying buffer
  safety warnings.
  
  -- Re-generate affected hashes.
  -- Clang-format applied to all changed files.
  -- Add a few missing .reserve() calls to vectors as noticed.
  -- Fix some mismatches between file names and header comments.
  -- Be more consistent with header comment format (blank lines and
     trailing //-only lines when a filename comment adjoins license
     boilerplate).
  
  Bug: b/436880895
  Change-Id: I3bde5cc2059acbe8345057289214f1a26f1c34aa
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6869022
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/tests/gl_tests/BlendMinMaxTest.cpp

• //
  // Copyright 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.
  //
  
  #include "test_utils/ANGLETest.h"
  
  #ifdef UNSAFE_BUFFERS_BUILD
  #    pragma allow_unsafe_buffers
  #endif
  
  using namespace angle;
  
  class BlendMinMaxTest : public ANGLETest<>
  {
    protected:
      BlendMinMaxTest()
      {
          setWindowWidth(128);
          setWindowHeight(128);
          setConfigRedBits(8);
          setConfigGreenBits(8);
          setConfigBlueBits(8);
          setConfigAlphaBits(8);
          setConfigDepthBits(24);
  
          mProgram           = 0;
          mColorLocation     = -1;
          mFramebuffer       = 0;
          mColorRenderbuffer = 0;
      }
  
      struct Color
      {
          float values[4];
      };
  
      static float getExpected(bool blendMin, float curColor, float prevColor)
      {
          return blendMin ? std::min(curColor, prevColor) : std::max(curColor, prevColor);
      }
  
      void runTest(GLenum colorFormat, GLenum type)
      {
          ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                             !IsGLExtensionEnabled("GL_EXT_blend_minmax"));
  
          SetUpFramebuffer(colorFormat);
  
          int minValue = 0;
          int maxValue = 1;
          if (type == GL_FLOAT)
          {
              minValue = -1024;
              maxValue = 1024;
          }
  
          const size_t colorCount = 128;
          Color colors[colorCount];
          for (size_t i = 0; i < colorCount; i++)
          {
              for (size_t j = 0; j < 4; j++)
              {
                  colors[i].values[j] =
                      static_cast<float>(minValue + (rand() % (maxValue - minValue)));
              }
          }
  
          float prevColor[4];
          for (size_t i = 0; i < colorCount; i++)
          {
              const Color &color = colors[i];
              glUseProgram(mProgram);
              glUniform4f(mColorLocation, color.values[0], color.values[1], color.values[2],
                          color.values[3]);
  
              bool blendMin = (rand() % 2 == 0);
              glBlendEquation(blendMin ? GL_MIN : GL_MAX);
  
              drawQuad(mProgram, essl1_shaders::PositionAttrib(), 0.5f);
  
              float pixel[4];
              if (type == GL_UNSIGNED_BYTE)
              {
                  GLubyte ubytePixel[4];
                  glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, ubytePixel);
                  for (size_t componentIdx = 0; componentIdx < ArraySize(pixel); componentIdx++)
                  {
                      pixel[componentIdx] = ubytePixel[componentIdx] / 255.0f;
                  }
              }
              else if (type == GL_FLOAT)
              {
                  glReadPixels(0, 0, 1, 1, GL_RGBA, GL_FLOAT, pixel);
              }
              else
              {
                  FAIL() << "Unexpected pixel type";
              }
  
              if (i > 0)
              {
                  const float errorRange = 1.0f / 255.0f;
                  for (size_t componentIdx = 0; componentIdx < ArraySize(pixel); componentIdx++)
                  {
                      EXPECT_NEAR(
                          getExpected(blendMin, color.values[componentIdx], prevColor[componentIdx]),
                          pixel[componentIdx], errorRange)
                          << " blendMin=" << blendMin << " componentIdx=" << componentIdx << std::endl
                          << " color.values[0]=" << color.values[0]
                          << " prevColor[0]=" << prevColor[0] << std::endl
                          << " color.values[1]=" << color.values[1]
                          << " prevColor[1]=" << prevColor[1] << std::endl
                          << " color.values[2]=" << color.values[2]
                          << " prevColor[2]=" << prevColor[2] << std::endl
                          << " color.values[3]=" << color.values[3]
                          << " prevColor[3]=" << prevColor[3];
                  }
              }
  
              memcpy(prevColor, pixel, sizeof(pixel));
          }
      }
  
      void testSetUp() override
      {
          mProgram = CompileProgram(essl1_shaders::vs::Simple(), essl1_shaders::fs::UniformColor());
          if (mProgram == 0)
          {
              FAIL() << "shader compilation failed.";
          }
  
          mColorLocation = glGetUniformLocation(mProgram, essl1_shaders::ColorUniform());
  
          glUseProgram(mProgram);
  
          glClearColor(0, 0, 0, 0);
          glClearDepthf(0.0);
          glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
          glEnable(GL_BLEND);
          glDisable(GL_DEPTH_TEST);
      }
  
      void SetUpFramebuffer(GLenum colorFormat)
      {
          glGenFramebuffers(1, &mFramebuffer);
          glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer);
  
          glGenRenderbuffers(1, &mColorRenderbuffer);
          glBindRenderbuffer(GL_RENDERBUFFER, mColorRenderbuffer);
          glRenderbufferStorage(GL_RENDERBUFFER, colorFormat, getWindowWidth(), getWindowHeight());
          glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
                                    mColorRenderbuffer);
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
          glClear(GL_COLOR_BUFFER_BIT);
  
          ASSERT_GL_NO_ERROR();
      }
  
      void testTearDown() override
      {
          glDeleteProgram(mProgram);
          glDeleteFramebuffers(1, &mFramebuffer);
          glDeleteRenderbuffers(1, &mColorRenderbuffer);
      }
  
      GLuint mProgram;
      GLint mColorLocation;
  
      GLuint mFramebuffer;
      GLuint mColorRenderbuffer;
  };
  
  TEST_P(BlendMinMaxTest, RGBA8)
  {
      runTest(GL_RGBA8, GL_UNSIGNED_BYTE);
  }
  
  TEST_P(BlendMinMaxTest, RGBA32F)
  {
      ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 || !IsGLExtensionEnabled("GL_EXT_float_blend") ||
                         !IsGLExtensionEnabled("GL_EXT_color_buffer_float"));
  
      runTest(GL_RGBA32F, GL_FLOAT);
  }
  
  TEST_P(BlendMinMaxTest, RGBA16F)
  {
      ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                         !IsGLExtensionEnabled("GL_EXT_color_buffer_half_float"));
  
      runTest(GL_RGBA16F, GL_FLOAT);
  }
  
  // Use this to select which configurations (e.g. which renderer, which GLES major version) these
  // tests should be run against.
  ANGLE_INSTANTIATE_TEST_ES2_AND_ES3(BlendMinMaxTest);
  

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