content: /*
   * Copyright (C) 2009 The Android Open Source Project
   * 
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
   * License. You may obtain a copy of the License at
   * 
   * http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
   * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language
   * governing permissions and limitations under the License.
   */
  
  package com.badlogic.gdx.backends.android.surfaceview;
  
  /*
   * Copyright (C) 2008 The Android Open Source Project
   * 
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
   * License. You may obtain a copy of the License at
   * 
   * http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
   * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language
   * governing permissions and limitations under the License.
   */
  
  import android.content.Context;
  import android.graphics.PixelFormat;
  import android.opengl.GLSurfaceView;
  import android.util.Log;
  
  import javax.microedition.khronos.egl.EGL10;
  import javax.microedition.khronos.egl.EGLConfig;
  import javax.microedition.khronos.egl.EGLContext;
  import javax.microedition.khronos.egl.EGLDisplay;
  
  /**
   * A simple GLSurfaceView sub-class that demonstrate how to perform OpenGL ES 2.0 rendering into a GL Surface. Note the following
   * important details:
   * <p/>
   * - The class must use a custom context factory to enable 2.0 rendering. See ContextFactory class definition below.
   * <p/>
   * - The class must use a custom EGLConfigChooser to be able to select an EGLConfig that supports 2.0. This is done by providing a
   * config specification to eglChooseConfig() that has the attribute EGL10.ELG_RENDERABLE_TYPE containing the EGL_OPENGL_ES2_BIT
   * flag set. See ConfigChooser class definition below.
   * <p/>
   * - The class must select the surface's format, then choose an EGLConfig that matches it exactly (with regards to
   * red/green/blue/alpha channels bit depths). Failure to do so would result in an EGL_BAD_MATCH error.
   */
  public class GLSurfaceView20 extends GLSurfaceView {
      static String TAG = "GL2JNIView";
      private static final boolean DEBUG = false;
  
      final ResolutionStrategy resolutionStrategy;
  
      public GLSurfaceView20(Context context, ResolutionStrategy resolutionStrategy) {
          super(context);
           this.resolutionStrategy = resolutionStrategy;
          init(false, 16, 0);
      }
  
      public GLSurfaceView20(Context context, boolean translucent, int depth, int stencil, ResolutionStrategy resolutionStrategy) {
          super(context);
          this.resolutionStrategy = resolutionStrategy;
          init(translucent, depth, stencil);
  
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          ResolutionStrategy.MeasuredDimension measures = resolutionStrategy.calcMeasures(widthMeasureSpec, heightMeasureSpec);
          setMeasuredDimension(measures.width, measures.height);
      }
  
      private void init(boolean translucent, int depth, int stencil) {
  
          /*
             * By default, GLSurfaceView() creates a RGB_565 opaque surface. If we want a translucent one, we should change the
             * surface's format here, using PixelFormat.TRANSLUCENT for GL Surfaces is interpreted as any 32-bit surface with alpha by
             * SurfaceFlinger.
             */
          if (translucent) {
              this.getHolder().setFormat(PixelFormat.TRANSLUCENT);
          }
  
          /*
             * Setup the context factory for 2.0 rendering. See ContextFactory class definition below
             */
          setEGLContextFactory(new ContextFactory());
  
          /*
             * We need to choose an EGLConfig that matches the format of our surface exactly. This is going to be done in our custom
             * config chooser. See ConfigChooser class definition below.
             */
          setEGLConfigChooser(translucent ? new ConfigChooser(8, 8, 8, 8, depth, stencil) : new ConfigChooser(5, 6, 5, 0, depth,
                  stencil));
  
          /* Set the renderer responsible for frame rendering */
      }
  
  
      static class ContextFactory implements GLSurfaceView.EGLContextFactory {
          private static int EGL_CONTEXT_CLIENT_VERSION = 0x3098;
  
          public EGLContext createContext(EGL10 egl, EGLDisplay display, EGLConfig eglConfig) {
              Log.w(TAG, "creating OpenGL ES 2.0 context");
              checkEglError("Before eglCreateContext", egl);
              int[] attrib_list = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL10.EGL_NONE};
              EGLContext context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list);
              checkEglError("After eglCreateContext", egl);
              return context;
          }
  
          public void destroyContext(EGL10 egl, EGLDisplay display, EGLContext context) {
              egl.eglDestroyContext(display, context);
          }
      }
  
      static void checkEglError(String prompt, EGL10 egl) {
          int error;
          while ((error = egl.eglGetError()) != EGL10.EGL_SUCCESS) {
              Log.e(TAG, String.format("%s: EGL error: 0x%x", prompt, error));
          }
      }
  
      private static class ConfigChooser implements GLSurfaceView.EGLConfigChooser {
  
          public ConfigChooser(int r, int g, int b, int a, int depth, int stencil) {
              mRedSize = r;
              mGreenSize = g;
              mBlueSize = b;
              mAlphaSize = a;
              mDepthSize = depth;
              mStencilSize = stencil;
          }
  
          /*
             * This EGL config specification is used to specify 2.0 rendering. We use a minimum size of 4 bits for red/green/blue, but
             * will perform actual matching in chooseConfig() below.
             */
          private static int EGL_OPENGL_ES2_BIT = 4;
          private static int[] s_configAttribs2 = {EGL10.EGL_RED_SIZE, 4, EGL10.EGL_GREEN_SIZE, 4, EGL10.EGL_BLUE_SIZE, 4,
                  EGL10.EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, EGL10.EGL_NONE};
  
          public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) {
  
              /*
                  * Get the number of minimally matching EGL configurations
                  */
              int[] num_config = new int[1];
              egl.eglChooseConfig(display, s_configAttribs2, null, 0, num_config);
  
              int numConfigs = num_config[0];
  
              if (numConfigs <= 0) {
                  throw new IllegalArgumentException("No configs match configSpec");
              }
  
              /*
                  * Allocate then read the array of minimally matching EGL configs
                  */
              EGLConfig[] configs = new EGLConfig[numConfigs];
              egl.eglChooseConfig(display, s_configAttribs2, configs, numConfigs, num_config);
  
              if (DEBUG) {
                  printConfigs(egl, display, configs);
              }
              /*
                  * Now return the "best" one
                  */
              return chooseConfig(egl, display, configs);
          }
  
          public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display, EGLConfig[] configs) {
              for (EGLConfig config : configs) {
                  int d = findConfigAttrib(egl, display, config, EGL10.EGL_DEPTH_SIZE, 0);
                  int s = findConfigAttrib(egl, display, config, EGL10.EGL_STENCIL_SIZE, 0);
  
                  // We need at least mDepthSize and mStencilSize bits
                  if (d < mDepthSize || s < mStencilSize) continue;
  
                  // We want an *exact* match for red/green/blue/alpha
                  int r = findConfigAttrib(egl, display, config, EGL10.EGL_RED_SIZE, 0);
                  int g = findConfigAttrib(egl, display, config, EGL10.EGL_GREEN_SIZE, 0);
                  int b = findConfigAttrib(egl, display, config, EGL10.EGL_BLUE_SIZE, 0);
                  int a = findConfigAttrib(egl, display, config, EGL10.EGL_ALPHA_SIZE, 0);
  
                  if (r == mRedSize && g == mGreenSize && b == mBlueSize && a == mAlphaSize) return config;
              }
              return null;
          }
  
          private int findConfigAttrib(EGL10 egl, EGLDisplay display, EGLConfig config, int attribute, int defaultValue) {
  
              if (egl.eglGetConfigAttrib(display, config, attribute, mValue)) {
                  return mValue[0];
              }
              return defaultValue;
          }
  
          private void printConfigs(EGL10 egl, EGLDisplay display, EGLConfig[] configs) {
              int numConfigs = configs.length;
              Log.w(TAG, String.format("%d configurations", numConfigs));
              for (int i = 0; i < numConfigs; i++) {
                  Log.w(TAG, String.format("Configuration %d:\n", i));
                  printConfig(egl, display, configs[i]);
              }
          }
  
          private void printConfig(EGL10 egl, EGLDisplay display, EGLConfig config) {
              int[] attributes = {EGL10.EGL_BUFFER_SIZE, EGL10.EGL_ALPHA_SIZE, EGL10.EGL_BLUE_SIZE, EGL10.EGL_GREEN_SIZE,
                      EGL10.EGL_RED_SIZE, EGL10.EGL_DEPTH_SIZE, EGL10.EGL_STENCIL_SIZE, EGL10.EGL_CONFIG_CAVEAT, EGL10.EGL_CONFIG_ID,
                      EGL10.EGL_LEVEL, EGL10.EGL_MAX_PBUFFER_HEIGHT, EGL10.EGL_MAX_PBUFFER_PIXELS, EGL10.EGL_MAX_PBUFFER_WIDTH,
                      EGL10.EGL_NATIVE_RENDERABLE, EGL10.EGL_NATIVE_VISUAL_ID, EGL10.EGL_NATIVE_VISUAL_TYPE,
                      0x3030, // EGL10.EGL_PRESERVED_RESOURCES,
                      EGL10.EGL_SAMPLES, EGL10.EGL_SAMPLE_BUFFERS, EGL10.EGL_SURFACE_TYPE, EGL10.EGL_TRANSPARENT_TYPE,
                      EGL10.EGL_TRANSPARENT_RED_VALUE, EGL10.EGL_TRANSPARENT_GREEN_VALUE, EGL10.EGL_TRANSPARENT_BLUE_VALUE, 0x3039, // EGL10.EGL_BIND_TO_TEXTURE_RGB,
                      0x303A, // EGL10.EGL_BIND_TO_TEXTURE_RGBA,
                      0x303B, // EGL10.EGL_MIN_SWAP_INTERVAL,
                      0x303C, // EGL10.EGL_MAX_SWAP_INTERVAL,
                      EGL10.EGL_LUMINANCE_SIZE, EGL10.EGL_ALPHA_MASK_SIZE, EGL10.EGL_COLOR_BUFFER_TYPE, EGL10.EGL_RENDERABLE_TYPE, 0x3042 // EGL10.EGL_CONFORMANT
              };
              String[] names = {"EGL_BUFFER_SIZE", "EGL_ALPHA_SIZE", "EGL_BLUE_SIZE", "EGL_GREEN_SIZE", "EGL_RED_SIZE",
                      "EGL_DEPTH_SIZE", "EGL_STENCIL_SIZE", "EGL_CONFIG_CAVEAT", "EGL_CONFIG_ID", "EGL_LEVEL", "EGL_MAX_PBUFFER_HEIGHT",
                      "EGL_MAX_PBUFFER_PIXELS", "EGL_MAX_PBUFFER_WIDTH", "EGL_NATIVE_RENDERABLE", "EGL_NATIVE_VISUAL_ID",
                      "EGL_NATIVE_VISUAL_TYPE", "EGL_PRESERVED_RESOURCES", "EGL_SAMPLES", "EGL_SAMPLE_BUFFERS", "EGL_SURFACE_TYPE",
                      "EGL_TRANSPARENT_TYPE", "EGL_TRANSPARENT_RED_VALUE", "EGL_TRANSPARENT_GREEN_VALUE", "EGL_TRANSPARENT_BLUE_VALUE",
                      "EGL_BIND_TO_TEXTURE_RGB", "EGL_BIND_TO_TEXTURE_RGBA", "EGL_MIN_SWAP_INTERVAL", "EGL_MAX_SWAP_INTERVAL",
                      "EGL_LUMINANCE_SIZE", "EGL_ALPHA_MASK_SIZE", "EGL_COLOR_BUFFER_TYPE", "EGL_RENDERABLE_TYPE", "EGL_CONFORMANT"};
              int[] value = new int[1];
              for (int i = 0; i < attributes.length; i++) {
                  int attribute = attributes[i];
                  String name = names[i];
                  if (egl.eglGetConfigAttrib(display, config, attribute, value)) {
                      Log.w(TAG, String.format("  %s: %d\n", name, value[0]));
                  } else {
                      // Log.w(TAG, String.format("  %s: failed\n", name));
                      while (egl.eglGetError() != EGL10.EGL_SUCCESS)
                          ;
                  }
              }
          }
  
          // Subclasses can adjust these values:
          protected int mRedSize;
          protected int mGreenSize;
          protected int mBlueSize;
          protected int mAlphaSize;
          protected int mDepthSize;
          protected int mStencilSize;
          private int[] mValue = new int[1];
      }
  }
  