kc3-lang/angle/samples/multi_window/MultiWindow.cpp

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• Hash : 9d737966
  Author :
  Date : 2019-08-14T12:25:12
  

  Standardize copyright notices to project style
  
  For all "ANGLE Project" copyrights, standardize to the format specified
  by the style guide. Changes:
  - "Copyright (c)" and "Copyright(c)" changed to just "Copyright".
  - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1").
  - Fixed a small number of files that had no copyright date using the
    initial commit year from the version control history.
  - Fixed one instance of copyright being "The ANGLE Project" rather than
    "The ANGLE Project Authors"
  
  These changes are applied both to the copyright of source file, and
  where applicable to copyright statements that are generated by
  templates.
  
  BUG=angleproject:3811
  
  Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• samples/multi_window/MultiWindow.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 "SampleApplication.h"
  
  #include <algorithm>
  #include <cmath>
  #include <vector>
  
  #include "util/Matrix.h"
  #include "util/random_utils.h"
  #include "util/shader_utils.h"
  
  using namespace angle;
  
  class MultiWindowSample : public SampleApplication
  {
    public:
      MultiWindowSample(int argc, char **argv)
          : SampleApplication("MultiWindow", argc, argv, 2, 0, 256, 256)
      {}
  
      bool initialize() override
      {
          constexpr char kVS[] = R"(attribute vec4 vPosition;
  void main()
  {
      gl_Position = vPosition;
  })";
  
          constexpr char kFS[] = R"(precision mediump float;
  void main()
  {
      gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
  })";
  
          mProgram = CompileProgram(kVS, kFS);
          if (!mProgram)
          {
              return false;
          }
  
          // Set an initial rotation
          mRotation = 45.0f;
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  
          window rootWindow;
          rootWindow.osWindow = getWindow();
          rootWindow.surface  = getSurface();
          mWindows.push_back(rootWindow);
  
          const size_t numWindows = 5;
          for (size_t i = 1; i < numWindows; i++)
          {
              window window;
  
              window.osWindow = OSWindow::New();
              if (!window.osWindow->initialize("MultiWindow", 256, 256))
              {
                  return false;
              }
  
              window.surface = eglCreateWindowSurface(getDisplay(), getConfig(),
                                                      window.osWindow->getNativeWindow(), nullptr);
              if (window.surface == EGL_NO_SURFACE)
              {
                  return false;
              }
  
              window.osWindow->setVisible(true);
  
              mWindows.push_back(window);
          }
  
          int baseX = rootWindow.osWindow->getX();
          int baseY = rootWindow.osWindow->getY();
          for (auto &window : mWindows)
          {
              int x      = baseX + mRNG.randomIntBetween(0, 512);
              int y      = baseY + mRNG.randomIntBetween(0, 512);
              int width  = mRNG.randomIntBetween(128, 512);
              int height = mRNG.randomIntBetween(128, 512);
              window.osWindow->setPosition(x, y);
              window.osWindow->resize(width, height);
          }
  
          return true;
      }
  
      void destroy() override { glDeleteProgram(mProgram); }
  
      void step(float dt, double totalTime) override
      {
          mRotation = fmod(mRotation + (dt * 40.0f), 360.0f);
  
          for (auto &window : mWindows)
          {
              window.osWindow->messageLoop();
          }
      }
  
      void draw() override
      {
          OSWindow *rootWindow = mWindows[0].osWindow;
          int left             = rootWindow->getX();
          int right            = rootWindow->getX() + rootWindow->getWidth();
          int top              = rootWindow->getY();
          int bottom           = rootWindow->getY() + rootWindow->getHeight();
  
          for (auto &windowRecord : mWindows)
          {
              OSWindow *window = windowRecord.osWindow;
              left             = std::min(left, window->getX());
              right            = std::max(right, window->getX() + window->getWidth());
              top              = std::min(top, window->getY());
              bottom           = std::max(bottom, window->getY() + window->getHeight());
          }
  
          float midX = (left + right) * 0.5f;
          float midY = (top + bottom) * 0.5f;
  
          Matrix4 modelMatrix = Matrix4::translate(Vector3(midX, midY, 0.0f)) *
                                Matrix4::rotate(mRotation, Vector3(0.0f, 0.0f, 1.0f)) *
                                Matrix4::translate(Vector3(-midX, -midY, 0.0f));
          Matrix4 viewMatrix = Matrix4::identity();
  
          for (auto &windowRecord : mWindows)
          {
              OSWindow *window   = windowRecord.osWindow;
              EGLSurface surface = windowRecord.surface;
  
              eglMakeCurrent(getDisplay(), surface, surface, getContext());
  
              Matrix4 orthoMatrix =
                  Matrix4::ortho(static_cast<float>(window->getX()),
                                 static_cast<float>(window->getX() + window->getWidth()),
                                 static_cast<float>(window->getY() + window->getHeight()),
                                 static_cast<float>(window->getY()), 0.0f, 1.0f);
              Matrix4 mvpMatrix = orthoMatrix * viewMatrix * modelMatrix;
  
              Vector3 vertices[] = {
                  Matrix4::transform(mvpMatrix, Vector4(midX, static_cast<float>(top), 0.0f, 1.0f)),
                  Matrix4::transform(mvpMatrix, Vector4(static_cast<float>(left),
                                                        static_cast<float>(bottom), 0.0f, 1.0f)),
                  Matrix4::transform(mvpMatrix, Vector4(static_cast<float>(right),
                                                        static_cast<float>(bottom), 0.0f, 1.0f)),
              };
  
              // Set the viewport
              glViewport(0, 0, window->getWidth(), window->getHeight());
  
              // Clear the color buffer
              glClear(GL_COLOR_BUFFER_BIT);
  
              // Use the program object
              glUseProgram(mProgram);
  
              // Load the vertex data
              glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, vertices[0].data());
              glEnableVertexAttribArray(0);
  
              glDrawArrays(GL_TRIANGLES, 0, 3);
  
              eglSwapBuffers(getDisplay(), surface);
          }
      }
  
      // Override swap to do nothing as we already swapped the root
      // window in draw() and swapping another time would invalidate
      // the content of the default framebuffer.
      void swap() override {}
  
    private:
      // Handle to a program object
      GLuint mProgram;
  
      // Current rotation
      float mRotation;
  
      // Window and surface data
      struct window
      {
          OSWindow *osWindow;
          EGLSurface surface;
      };
      std::vector<window> mWindows;
  
      RNG mRNG;
  };
  
  int main(int argc, char **argv)
  {
      MultiWindowSample app(argc, argv);
      return app.run();
  }
  

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