kc3-lang/angle/samples/torus_lighting/TorusLightingES1.cpp

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• Author : Lubosz Sarnecki
  Date : 2021-04-28 14:23:48
  Hash : d1da88ee
  Message : samples: Add TorusLighting sample. Add a vertex buffer example for GLES1 and 2. Bug: angleproject:5751 Change-Id: If039451ff85dfffd8915497e9aaaab6e4ff71181 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2859827 Commit-Queue: Cody Northrop <cnorthrop@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• samples/torus_lighting/TorusLightingES1.cpp

• //
  // Copyright 2021 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 CubeMapActivity.java from The Android Open Source Project ApiDemos
  // https://android.googlesource.com/platform/development/+/refs/heads/master/samples/ApiDemos/src/com/example/android/apis/graphics/CubeMapActivity.java
  
  #include "SampleApplication.h"
  #include "torus.h"
  
  class GLES1TorusLightingSample : public SampleApplication
  {
    public:
      GLES1TorusLightingSample(int argc, char **argv)
          : SampleApplication("GLES1 Torus Lighting", argc, argv, 1, 0)
      {}
  
      bool initialize() override
      {
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  
          glShadeModel(GL_SMOOTH);
  
          GLfloat light_model_ambient[] = {1.0f, 1.0f, 1.0f, 1.0f};
          glLightModelfv(GL_LIGHT_MODEL_AMBIENT, light_model_ambient);
          glEnable(GL_LIGHTING);
          glEnable(GL_LIGHT0);
  
          GenerateTorus(&mVertexBuffer, &mIndexBuffer, &mIndexCount);
  
          return true;
      }
  
      void destroy() override
      {
          glDeleteBuffers(1, &mVertexBuffer);
          glDeleteBuffers(1, &mIndexBuffer);
      }
  
      void draw() override
      {
          glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
          glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
          float ratio = (float)getWindow()->getWidth() / (float)getWindow()->getHeight();
          glMatrixMode(GL_PROJECTION);
          glLoadIdentity();
          glFrustumf(-ratio, ratio, -1, 1, 1.0f, 20.0f);
  
          glEnable(GL_DEPTH_TEST);
          glMatrixMode(GL_MODELVIEW);
          glLoadIdentity();
  
          glPushMatrix();
  
          GLfloat lightDir[] = {0.0f, 0.0f, 1.0f, 0.0f};
          glLightfv(GL_LIGHT0, GL_POSITION, lightDir);
          glPopMatrix();
  
          glTranslatef(0, 0, -5);
  
          glRotatef(mAngle, 0, 1, 0);
          glRotatef(mAngle * 0.25f, 1, 0, 0);
  
          glEnableClientState(GL_VERTEX_ARRAY);
  
          glBindBuffer(GL_ARRAY_BUFFER, mVertexBuffer);
          glVertexPointer(3, GL_FLOAT, 6 * sizeof(GLfloat), nullptr);
  
          glEnableClientState(GL_NORMAL_ARRAY);
          glNormalPointer(GL_FLOAT, 6 * sizeof(GLfloat),
                          reinterpret_cast<const void *>(3 * sizeof(GLfloat)));
  
          glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer);
          glDrawElements(GL_TRIANGLES, mIndexCount, GL_UNSIGNED_SHORT, 0);
          glDisableClientState(GL_VERTEX_ARRAY);
          glDisableClientState(GL_NORMAL_ARRAY);
          glBindBuffer(GL_ARRAY_BUFFER, 0);
          glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
  
          mAngle++;
      }
  
    private:
      GLuint mVertexBuffer;
      GLuint mIndexBuffer;
      GLsizei mIndexCount;
      float mAngle = 0;
  };
  
  int main(int argc, char **argv)
  {
      GLES1TorusLightingSample app(argc, argv);
      return app.run();
  }