kc3-lang/angle/samples/hello_triangle

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• Author : Luc Ferron
  Date : 2018-06-18 08:28:50
  Hash : 17cee572
  Message : SampleApps: Refactor to use cli args the same way Bug: angleproject:2669 Change-Id: Ica5b49e63e8af69595cdde3737b0aa1808d7d841 Reviewed-on: https://chromium-review.googlesource.com/1104377 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Luc Ferron <lucferron@chromium.org>

• HelloTriangle.cpp

• //
  // Copyright (c) 2014 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.
  //
  
  //            Based on Hello_Triangle.c from
  // Book:      OpenGL(R) ES 2.0 Programming Guide
  // Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
  // ISBN-10:   0321502795
  // ISBN-13:   9780321502797
  // Publisher: Addison-Wesley Professional
  // URLs:      http://safari.informit.com/9780321563835
  //            http://www.opengles-book.com
  
  #include "SampleApplication.h"
  #include "shader_utils.h"
  
  class HelloTriangleSample : public SampleApplication
  {
    public:
      HelloTriangleSample(int argc, char **argv)
          : SampleApplication("HelloTriangle", argc, argv, 2, 0)
      {
      }
  
      virtual bool initialize()
      {
          const std::string vs =
              R"(attribute vec4 vPosition;
              void main()
              {
                  gl_Position = vPosition;
              })";
  
          const std::string fs =
              R"(precision mediump float;
              void main()
              {
                  gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
              })";
  
          mProgram = CompileProgram(vs, fs);
          if (!mProgram)
          {
              return false;
          }
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  
          return true;
      }
  
      virtual void destroy()
      {
          glDeleteProgram(mProgram);
      }
  
      virtual void draw()
      {
          GLfloat vertices[] =
          {
               0.0f,  0.5f, 0.0f,
              -0.5f, -0.5f, 0.0f,
               0.5f, -0.5f, 0.0f,
          };
  
          // Set the viewport
          glViewport(0, 0, getWindow()->getWidth(), getWindow()->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);
          glEnableVertexAttribArray(0);
  
          glDrawArrays(GL_TRIANGLES, 0, 3);
      }
  
    private:
      GLuint mProgram;
  };
  
  int main(int argc, char **argv)
  {
      HelloTriangleSample app(argc, argv);
      return app.run();
  }