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

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• Hash : 2a63b3f8
  Author :
  Date : 2016-02-08T12:29:08
  

  Re-land "Implement EGL_experimental_present_path_angle"
  
  - Re-land with clang fix.
  
  This allows ANGLE to render directly onto a D3D swapchain in the correct
  orientation when using the D3D11 renderer.
  
  The trick is to add an extra uniform to each shader which takes either
  the value +1.0 or -1.0. When rendering to a texture, ANGLE sets this
  value to -1.0. When rendering to the default framebuffer, ANGLE sets
  this value to +1.0. ANGLE multiplies vertex positions by this value in
  the VS to invert rendering when appropriate. It also corrects other
  state (e.g. viewport/scissor rect) and shader built-in values
  (e.g. gl_FragCoord).
  
  This saves a substantial amount of GPU time and lowers power
  consumption. For example, the old method (where ANGLE renders all
  content onto an offscreen texture, and then copies/inverts this onto the
  swapchain at eglSwapBuffers() time) uses about 20% of the GPU each frame
  on a Lumia 630.
  
  Verification:
  + dEQP GL ES2 tests pass when "present path fast" is enabled
  + all ANGLE_end2end_tests pass when "present path fast" is enabled
  
  BUG=angleproject:1219
  
  Change-Id: I56b339897828753a616d7bae837a2f354dba9c63
  Reviewed-on: https://chromium-review.googlesource.com/326730
  Tryjob-Request: Austin Kinross <aukinros@microsoft.com>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/tests/gl_tests/ViewportTest.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"
  
  using namespace angle;
  
  namespace
  {
  
  class ViewportTest : public ANGLETest
  {
    protected:
      ViewportTest()
      {
          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);
          }
      }
  
      void SetUp() override
      {
          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 and glScissor with default parameters.
          glScissor(0, 0, getWindowWidth(), getWindowHeight());
          glViewport(0, 0, getWindowWidth(), getWindowHeight());
  
          glDisable(GL_DEPTH_TEST);
      }
  
      void TearDown() override
      {
          glDeleteProgram(mProgram);
  
          ANGLETest::TearDown();
      }
  
      GLuint mProgram;
  };
  
  TEST_P(ViewportTest, QuarterWindow)
  {
      glViewport(0, 0, getWindowWidth() / 4, getWindowHeight() / 4);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, QuarterWindowCentered)
  {
      glViewport(getWindowWidth() * 3 / 8, getWindowHeight() * 3 / 8, getWindowWidth() / 4, getWindowHeight() / 4);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, FullWindow)
  {
      glViewport(0, 0, getWindowWidth(), getWindowHeight());
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, FullWindowOffCenter)
  {
      glViewport(-getWindowWidth() / 2, getWindowHeight() / 2, getWindowWidth(), getWindowHeight());
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, DoubleWindow)
  {
      glViewport(0, 0, getWindowWidth() * 2, getWindowHeight() * 2);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, DoubleWindowCentered)
  {
      glViewport(-getWindowWidth() / 2, -getWindowHeight() / 2, getWindowWidth() * 2, getWindowHeight() * 2);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, DoubleWindowOffCenter)
  {
      glViewport(-getWindowWidth() * 3 / 4, getWindowHeight() * 3 / 4, getWindowWidth(), getWindowHeight());
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, TripleWindow)
  {
      glViewport(0, 0, getWindowWidth() * 3, getWindowHeight() * 3);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, TripleWindowCentered)
  {
      glViewport(-getWindowWidth(), -getWindowHeight(), getWindowWidth() * 3, getWindowHeight() * 3);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  TEST_P(ViewportTest, TripleWindowOffCenter)
  {
      glViewport(-getWindowWidth() * 3 / 2, -getWindowHeight() * 3 / 2, getWindowWidth() * 3, getWindowHeight() * 3);
  
      runNonScissoredTest();
  
      runScissoredTest();
  }
  
  // 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_INSTANTIATE_TEST(ViewportTest,
                         ES2_D3D9(),
                         ES2_D3D11(EGL_EXPERIMENTAL_PRESENT_PATH_COPY_ANGLE),
                         ES2_D3D11(EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE),
                         ES2_D3D11_FL9_3(),
                         ES2_OPENGLES(),
                         ES3_OPENGLES());
  
  } // namespace
  

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