kc3-lang/angle/samples/hello_triangle_gl

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• Author : Eddie Hatfield
  Date : 2022-07-21 10:38:47
  Hash : c54ed790
  Message : Get desktop GL conformance tests to build The target for these tests is angle_deqp_gl_tests. Bug: angleproject:7533 Change-Id: I290822671d99da020f9a6a1f02bee43987644bf9 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3766435 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Eddie Hatfield <eddiehatfield@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>

• HelloTriangleGL.cpp

• //
  // Copyright 2022 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 "util/shader_utils.h"
  
  // Practically identical to the normal HelloTrianglesSample, but uses desktop GL instead.
  class HelloTriangleGLSample : public SampleApplication
  {
    public:
      HelloTriangleGLSample(int argc, char **argv)
          : SampleApplication("HelloTriangle", argc, argv, ClientType::GL3_3_CORE)
      {}
  
      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;
          }
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  
          return true;
      }
  
      void destroy() override { glDeleteProgram(mProgram); }
  
      void draw() override
      {
          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)
  {
      HelloTriangleGLSample app(argc, argv);
      return app.run();
  }