kc3-lang/angle/tests/angle_tests/ViewportTest.cpp

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• Hash : 4fd18b1b
  Author :
  Date : 2014-12-22T12:32:05
  

  Emulate large and negative viewports on D3D11 Feature Level 9_3
  
  Like D3D9, D3D11 Feature Level 9_3 doesn't support large or negative
  viewports. We have to emulate these in the vertex shader.
  
  BUG=angle:858
  
  Change-Id: I2bd53e3921dc3590cc7193164d73596deafca9ea
  Reviewed-on: https://chromium-review.googlesource.com/236040
  Tested-by: Austin Kinross <aukinros@microsoft.com>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• tests/angle_tests/ViewportTest.cpp

• #include "ANGLETest.h"
  
  // Use this to select which configurations (e.g. which renderer, which GLES major version) these tests should be run against.
  // D3D11 Feature Level 9 and D3D9 emulate large and negative viewports in the vertex shader. We should test both of these as well as D3D11 Feature Level 10_0+.
  ANGLE_TYPED_TEST_CASE(ViewportTest, ES2_D3D9, ES2_D3D11, ES2_D3D11_FL9_3);
  
  template<typename T>
  class ViewportTest : public ANGLETest
  {
    protected:
      ViewportTest() : ANGLETest(T::GetGlesMajorVersion(), T::GetPlatform())
      {
          setWindowWidth(512);
          setWindowHeight(512);
          setConfigRedBits(8);
          setConfigGreenBits(8);
          setConfigBlueBits(8);
          setConfigAlphaBits(8);
          setConfigDepthBits(24);
  
          mProgram = 0;
      }
  
      void runNonScissoredTest()
      {
          glClearColor(0, 0, 0, 1);
          glClear(GL_COLOR_BUFFER_BIT);
  
          runTest();
      }
  
      void runScissoredTest()
      {
          glClearColor(0, 0, 0, 1);
          glClear(GL_COLOR_BUFFER_BIT);
  
          glEnable(GL_SCISSOR_TEST);
          glScissor(0, getWindowHeight() / 2, getWindowWidth(), getWindowHeight() / 2);
  
          runTest();
      }
  
      void runTest()
      {
          // Firstly ensure that no errors have been hit.
          EXPECT_GL_NO_ERROR();
  
          GLint viewportSize[4];
          glGetIntegerv(GL_VIEWPORT, viewportSize);
  
          // Clear to green. Might be a scissored clear, if scissorSize != window size
          glClearColor(0, 1, 0, 1);
          glClear(GL_COLOR_BUFFER_BIT);
  
          // Draw a red quad centered in the middle of the viewport, with dimensions 25% of the size of the viewport.
          drawQuad(mProgram, "position", 0.5f, 0.25f);
  
          GLint centerViewportX = viewportSize[0] + (viewportSize[2] / 2);
          GLint centerViewportY = viewportSize[1] + (viewportSize[3] / 2);
  
          GLint redQuadLeftSideX   = viewportSize[0] + viewportSize[2] * 3 / 8;
          GLint redQuadRightSideX  = viewportSize[0] + viewportSize[2] * 5 / 8;
          GLint redQuadTopSideY    = viewportSize[1] + viewportSize[3] * 3 / 8;
          GLint redQuadBottomSideY = viewportSize[1] + viewportSize[3] * 5 / 8;
  
          // The midpoint of the viewport should be red.
          checkPixel(centerViewportX, centerViewportY, true);
  
          // Pixels just inside the red quad should be red.
          checkPixel(redQuadLeftSideX,      redQuadTopSideY,        true);
          checkPixel(redQuadLeftSideX,      redQuadBottomSideY - 1, true);
          checkPixel(redQuadRightSideX - 1, redQuadTopSideY,        true);
          checkPixel(redQuadRightSideX - 1, redQuadBottomSideY - 1, true);
  
          // Pixels just outside the red quad shouldn't be red.
          checkPixel(redQuadLeftSideX - 1,  redQuadTopSideY - 1, false);
          checkPixel(redQuadLeftSideX - 1,  redQuadBottomSideY,  false);
          checkPixel(redQuadRightSideX,     redQuadTopSideY - 1, false);
          checkPixel(redQuadRightSideX,     redQuadBottomSideY,  false);
  
          // Pixels just within the viewport shouldn't be red.
          checkPixel(viewportSize[0],                        viewportSize[1],                       false);
          checkPixel(viewportSize[0],                        viewportSize[1] + viewportSize[3] - 1, false);
          checkPixel(viewportSize[0] + viewportSize[2] - 1,  viewportSize[1],                       false);
          checkPixel(viewportSize[0] + viewportSize[2] - 1,  viewportSize[1] + viewportSize[3] - 1, false);
      }
  
      void checkPixel(GLint x, GLint y, GLboolean renderedRed)
      {
          // By default, expect the pixel to be black.
          GLint expectedRedChannel = 0;
          GLint expectedGreenChannel = 0;
  
          GLint scissorSize[4];
          glGetIntegerv(GL_SCISSOR_BOX, scissorSize);
  
          EXPECT_GL_NO_ERROR();
  
          if (scissorSize[0] <= x && x < scissorSize[0] + scissorSize[2]
              && scissorSize[1] <= y && y < scissorSize[1] + scissorSize[3])
          {
              // If the pixel lies within the scissor rect, then it should have been cleared to green.
              // If we rendered a red square on top of it, then the pixel should be red (the green channel will have been reset to 0).
              expectedRedChannel = renderedRed ? 255 : 0;
              expectedGreenChannel = renderedRed ? 0 : 255;
          }
  
          // If the pixel is within the bounds of the window, then we check it. Otherwise we skip it.
          if (0 <= x && x < getWindowWidth() && 0 <= y && y < getWindowHeight())
          {
              EXPECT_PIXEL_EQ(x, y, expectedRedChannel, expectedGreenChannel, 0, 255);
          }
      }
  
      virtual void SetUp()
      {
          ANGLETest::SetUp();
  
          const std::string testVertexShaderSource = SHADER_SOURCE
          (
              attribute highp vec4 position;
  
              void main(void)
              {
                  gl_Position = position;
              }
          );
  
          const std::string testFragmentShaderSource = SHADER_SOURCE
          (
              void main(void)
              {
                  gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
              }
          );
  
          mProgram = CompileProgram(testVertexShaderSource, testFragmentShaderSource);
          if (mProgram == 0)
          {
              FAIL() << "shader compilation failed.";
          }
  
          glUseProgram(mProgram);
  
          glClearColor(0, 0, 0, 1);
          glClearDepthf(0.0);
          glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
          // Call glViewport with default parameters.
          glViewport(0, 0, getWindowWidth(), getWindowHeight());
  
          glDisable(GL_DEPTH_TEST);
      }
  
      virtual void TearDown()
      {
          glDeleteProgram(mProgram);
  
          ANGLETest::TearDown();
      }
  
      GLuint mProgram;
  };
  
  TYPED_TEST(ViewportTest, QuarterWindow)
  {
      glViewport(0, 0, getWindowWidth() / 4, getWindowHeight() / 4);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, QuarterWindowCentered)
  {
      glViewport(getWindowWidth() * 3 / 8, getWindowHeight() * 3 / 8, getWindowWidth() / 4, getWindowHeight() / 4);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, FullWindow)
  {
      glViewport(0, 0, getWindowWidth(), getWindowHeight());
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, FullWindowOffCenter)
  {
      glViewport(-getWindowWidth() / 2, getWindowHeight() / 2, getWindowWidth(), getWindowHeight());
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, DoubleWindow)
  {
      glViewport(0, 0, getWindowWidth() * 2, getWindowHeight() * 2);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, DoubleWindowCentered)
  {
      glViewport(-getWindowWidth() / 2, -getWindowHeight() / 2, getWindowWidth() * 2, getWindowHeight() * 2);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, DoubleWindowOffCenter)
  {
      glViewport(-getWindowWidth() * 3 / 4, getWindowHeight() * 3 / 4, getWindowWidth(), getWindowHeight());
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, TripleWindow)
  {
      glViewport(0, 0, getWindowWidth() * 3, getWindowHeight() * 3);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, TripleWindowCentered)
  {
      glViewport(-getWindowWidth(), -getWindowHeight(), getWindowWidth() * 3, getWindowHeight() * 3);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TYPED_TEST(ViewportTest, TripleWindowOffCenter)
  {
      glViewport(-getWindowWidth() * 3 / 2, -getWindowHeight() * 3 / 2, getWindowWidth() * 3, getWindowHeight() * 3);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }

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