RetroArch/gfx/drivers_context/androidegl_ctx.c

/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2015 - Daniel De Matteis
 * 
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include "../../driver.h"
#include "../../general.h"
#include "../../runloop.h"
#include "../video_monitor.h"
#include "../drivers/gl_common.h"

#include <EGL/egl.h>

#include "../../frontend/drivers/platform_android.h"
#include <formats/image.h>

#include <stdint.h>

typedef struct gfx_ctx_android_data
{
   bool g_use_hw_ctx;
   EGLContext g_egl_hw_ctx;
   EGLContext g_egl_ctx;
   EGLSurface g_egl_surf;
   EGLDisplay g_egl_dpy;
   EGLConfig g_egl_config;
} gfx_ctx_android_data_t;

static bool g_es3;

static void android_gfx_ctx_set_swap_interval(void *data, unsigned interval)
{
   driver_t *driver = driver_get_ptr();
   gfx_ctx_android_data_t *android = NULL;
   
   android = (gfx_ctx_android_data_t*)driver->video_context_data;

   (void)data;
   if (!android)
      return;

   eglSwapInterval(android->g_egl_dpy, interval);
}

static void android_gfx_ctx_destroy_resources(gfx_ctx_android_data_t *android)
{
   if (!android)
      return;

   if (android->g_egl_dpy)
   {
      if (android->g_egl_ctx)
      {
         eglMakeCurrent(android->g_egl_dpy,
               EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
         eglDestroyContext(android->g_egl_dpy, android->g_egl_ctx);
      }

      if (android->g_egl_hw_ctx)
         eglDestroyContext(android->g_egl_dpy, android->g_egl_hw_ctx);

      if (android->g_egl_surf)
         eglDestroySurface(android->g_egl_dpy, android->g_egl_surf);
      eglTerminate(android->g_egl_dpy);
   }

   /* Be as careful as possible in deinit. */

   android->g_egl_ctx     = NULL;
   android->g_egl_hw_ctx  = NULL;
   android->g_egl_surf    = NULL;
   android->g_egl_dpy     = NULL;
   android->g_egl_config  = 0;
}

static void android_gfx_ctx_destroy(void *data)
{
   driver_t *driver = driver_get_ptr();
   gfx_ctx_android_data_t *android = NULL;
   
   android = (gfx_ctx_android_data_t*)driver->video_context_data;
   (void)data;

   if (!android)
      return;

   android_gfx_ctx_destroy_resources(android);

   if (driver->video_context_data)
      free(driver->video_context_data);
   driver->video_context_data = NULL;
}

static void android_gfx_ctx_get_video_size(void *data,
      unsigned *width, unsigned *height)
{
   EGLint gl_width, gl_height;
   driver_t *driver = driver_get_ptr();
   gfx_ctx_android_data_t *android = NULL;
   
   android = (gfx_ctx_android_data_t*)
      driver->video_context_data;

   *width  = 0;
   *height = 0;

   if (!android)
      return;
   if (!android->g_egl_dpy)
      return;

   eglQuerySurface(android->g_egl_dpy,
         android->g_egl_surf, EGL_WIDTH, &gl_width);
   eglQuerySurface(android->g_egl_dpy,
         android->g_egl_surf, EGL_HEIGHT, &gl_height);
   *width  = gl_width;
   *height = gl_height;
}

static bool android_gfx_ctx_init(void *data)
{
   int var;
   EGLint num_config, egl_version_major, egl_version_minor;
   EGLint format;
   EGLint context_attributes[] = {
      EGL_CONTEXT_CLIENT_VERSION, g_es3 ? 3 : 2,
      EGL_NONE
   };
   const EGLint attribs[] = {
      EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
      EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
      EGL_BLUE_SIZE, 8,
      EGL_GREEN_SIZE, 8,
      EGL_RED_SIZE, 8,
      EGL_ALPHA_SIZE, 8,
      EGL_NONE
   };
   driver_t *driver = driver_get_ptr();
   gfx_ctx_android_data_t *android = NULL;
   struct android_app *android_app = (struct android_app*)g_android;
   
   if (!android_app)
      return false;

   android = (gfx_ctx_android_data_t*)
      calloc(1, sizeof(gfx_ctx_android_data_t));

   if (!android)
      return false;

   RARCH_LOG("Android EGL: GLES version = %d.\n", g_es3 ? 3 : 2);

   android->g_egl_dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);

   if (!android->g_egl_dpy)
   {
      RARCH_ERR("[Android/EGL]: Couldn't get EGL display.\n");
      goto error;
   }

   if (!eglInitialize(android->g_egl_dpy,
            &egl_version_major, &egl_version_minor))
      goto error;

   RARCH_LOG("[ANDROID/EGL]: EGL version: %d.%d\n",
         egl_version_major, egl_version_minor);

   if (!eglChooseConfig(android->g_egl_dpy,
            attribs, &android->g_egl_config, 1, &num_config))
      goto error;

   var = eglGetConfigAttrib(android->g_egl_dpy, android->g_egl_config,
         EGL_NATIVE_VISUAL_ID, &format);

   if (!var)
   {
      RARCH_ERR("eglGetConfigAttrib failed: %d.\n", var);
      goto error;
   }

   ANativeWindow_setBuffersGeometry(android_app->window, 0, 0, format);

   android->g_egl_ctx = eglCreateContext(android->g_egl_dpy,
         android->g_egl_config, EGL_NO_CONTEXT, context_attributes);

   if (android->g_egl_ctx == EGL_NO_CONTEXT)
      goto error;

   if (android->g_use_hw_ctx)
   {
      android->g_egl_hw_ctx = eglCreateContext(android->g_egl_dpy,
           android->g_egl_config, android->g_egl_ctx,
            context_attributes);
      RARCH_LOG("[Android/EGL]: Created shared context: %p.\n",
            (void*)android->g_egl_hw_ctx);

      if (android->g_egl_hw_ctx == EGL_NO_CONTEXT)
         goto error;
   }

   android->g_egl_surf = eglCreateWindowSurface(android->g_egl_dpy,
         android->g_egl_config, android_app->window, 0);
   if (!android->g_egl_surf)
      goto error;

   if (!eglMakeCurrent(android->g_egl_dpy, android->g_egl_surf,
            android->g_egl_surf, android->g_egl_ctx))
      goto error;

   driver->video_context_data = android;

   return true;

error:
   android_gfx_ctx_destroy_resources(android);

   if (android)
      free(android);

   return false;
}

static void android_gfx_ctx_swap_buffers(void *data)
{
   driver_t *driver = driver_get_ptr();
   gfx_ctx_android_data_t *android = NULL;
   
   android = (gfx_ctx_android_data_t*)driver->video_context_data;

   (void)data;

   if (android)
      eglSwapBuffers(android->g_egl_dpy, android->g_egl_surf);
}

static void android_gfx_ctx_check_window(void *data, bool *quit,
      bool *resize, unsigned *width, unsigned *height, unsigned frame_count)
{
   unsigned new_width, new_height;
   global_t *global = global_get_ptr();

   (void)frame_count;

   *quit = false;

   android_gfx_ctx_get_video_size(data, &new_width, &new_height);

   if (new_width != *width || new_height != *height)
   {
      *width  = new_width;
      *height = new_height;
      *resize = true;
   }

   /* Check if we are exiting. */
   if (global->system.shutdown)
      *quit = true;
}

static void android_gfx_ctx_set_resize(void *data,
      unsigned width, unsigned height)
{
   (void)data;
   (void)width;
   (void)height;
}

static void android_gfx_ctx_update_window_title(void *data)
{
   char buf[128], buf_fps[128];
   settings_t *settings = config_get_ptr();

   video_monitor_get_fps(buf, sizeof(buf),
         buf_fps, sizeof(buf_fps));
   if (settings->fps_show)
      rarch_main_msg_queue_push(buf_fps, 1, 1, false);
}

static bool android_gfx_ctx_set_video_mode(void *data,
      unsigned width, unsigned height,
      bool fullscreen)
{
   (void)data;
   (void)width;
   (void)height;
   (void)fullscreen;
   return true;
}

static void android_gfx_ctx_input_driver(void *data,
      const input_driver_t **input, void **input_data)
{
   void *androidinput = input_android.init();

   (void)data;

   *input = androidinput ? &input_android : NULL;
   *input_data = androidinput;
}

static gfx_ctx_proc_t android_gfx_ctx_get_proc_address(
      const char *symbol)
{
   gfx_ctx_proc_t ret;
   void *sym__ = NULL;

   rarch_assert(sizeof(void*) == sizeof(void (*)(void)));

   sym__ = eglGetProcAddress(symbol);
   memcpy(&ret, &sym__, sizeof(void*));

   return ret;
}

static bool android_gfx_ctx_bind_api(void *data,
      enum gfx_ctx_api api, unsigned major, unsigned minor)
{
   unsigned version = major * 100 + minor;

   (void)data;

   if (version > 300)
      return false;
   if (version < 300)
      g_es3 = false;
   else if (version == 300)
      g_es3 = true;
   return api == GFX_CTX_OPENGL_ES_API;
}

static bool android_gfx_ctx_has_focus(void *data)
{
   (void)data;
   return true;
}

static bool android_gfx_ctx_suppress_screensaver(void *data, bool enable)
{
   (void)data;
   (void)enable;
   return false;
}

static bool android_gfx_ctx_has_windowed(void *data)
{
   (void)data;
   return false;
}

static void android_gfx_ctx_bind_hw_render(void *data, bool enable)
{
   driver_t *driver = driver_get_ptr();
   gfx_ctx_android_data_t *android = NULL;
   
   android = (gfx_ctx_android_data_t*)driver->video_context_data;

   (void)data;

   if (!android)
      return;

   android->g_use_hw_ctx = enable;

   if (!android->g_egl_dpy)
      return;
   if (!android->g_egl_surf)
      return;

   eglMakeCurrent(android->g_egl_dpy, android->g_egl_surf,
         android->g_egl_surf, enable ? 
         android->g_egl_hw_ctx : android->g_egl_ctx);
}

#define ANDROID_DENSITY_LOW      120
#define ANDROID_DENSITY_MEDIUM   160
#define ANDROID_DENSITY_TV       213
#define ANDROID_DENSITY_XHIGH    320
#define ANDROID_DENSITY_XXHIGH   480
#define ANDROID_DENSITY_XXXHIGH  640

static bool android_gfx_ctx_get_metrics(void *data,
	enum display_metric_types type, float *value)
{
   jclass metrics_class;
   jobject metrics;
   jmethodID getMetrics;
   struct android_app *android_app = (struct android_app*)g_android;
   JNIEnv *env           = (JNIEnv*)jni_thread_getenv();

   GET_METHOD_ID(env, getMetrics, android_app->activity, "getMetrics", "()Landroid/util/DisplayMetrics;");
   if (!getMetrics)
      goto error;

   CALL_OBJ_STATIC_METHOD(env, metrics, android_app->activity, getMetrics);
   GET_OBJECT_CLASS(env, metrics_class, metrics);

   /* Density */
   float density         = (*env)->GetFloatField(env, metrics, (*env)->GetFieldID(env, metrics_class, "density", "F"));
   float scaled_density  = (*env)->GetFloatField(env, metrics, (*env)->GetFieldID(env, metrics_class, "scaledDensity", "F"));
   int     density_dpi   = (*env)->GetIntField(env,   metrics, (*env)->GetFieldID(env, metrics_class, "densityDpi", "I"));

   /* Size */
   int     width_pixels  = (*env)->GetIntField(env, metrics,   (*env)->GetFieldID(env, metrics_class, "widthPixels", "I"));
   int    height_pixels  = (*env)->GetIntField(env, metrics,   (*env)->GetFieldID(env, metrics_class, "heightPixels", "I"));

   /* DPI */
   /* Apparently xdpi and ydpi can't be trusted to be implemented correctly, so don't try to rely on it...
    *
    * https://groups.google.com/forum/#!topic/android-developers/QjUlaRohRPI
    *
    * "The xdpi and ydpi are supposed to be the real DPI of the screen...  though as you've seen, 
    * many devices don't set it correctly. :(  This is our fault, it isn't actually used anywhere 
    * in the platform, so people don't realize they have a bad value, and we haven't had a CTS 
    * test to try to make sure it is sane (it's not clear how that test should work).  Worse, we 
    * shipping the original Droid with a graphics driver that reports the wrong value here...  
    * in fact that reported that same damnable 96."
    *
    * Unfortunately, I don't have a good solution if you want to get the real exactly screen dots per inch.  
    * One thing you could do is compare xdpi/ydpi with densityDpi and if they are significantly 
    * far apart, assume the values are bad and just fall back on densityDpi as an approximation.  
    *
    * Be careful on this, because a correctly working device may have densityDpi fairly different 
    * than the real dpi -- for example the Samsung TAB uses high density even though its screen's 
    * really density is a fair amount lower than 240."
    */
   float xdpi = (*env)->GetFloatField(env, metrics, (*env)->GetFieldID(env, metrics_class, "xdpi", "F"));
   float ydpi = (*env)->GetFloatField(env, metrics, (*env)->GetFieldID(env, metrics_class, "ydpi", "F"));

   (void)width_pixels;
   (void)height_pixels;
   (void)scaled_density;
   (void)density;
   (void)density_dpi;

   switch (type)
   {
      case DISPLAY_METRIC_MM_WIDTH:
         /* can't guarantee this to be accurate - so return false anyway. */
         *value = xdpi;
         return false;
      case DISPLAY_METRIC_MM_HEIGHT:
         /* can't guarantee this to be accurate - so return false anyway. */
         *value = ydpi;
         return false;
      case DISPLAY_METRIC_DPI:
         /* just go with quantized DPI. */
         *value = density_dpi;
         break;
      case DISPLAY_METRIC_NONE:
      default:
         *value = 0;
         return false;
   }

   return true;

error:
   return false;
}

const gfx_ctx_driver_t gfx_ctx_android = {
   android_gfx_ctx_init,
   android_gfx_ctx_destroy,
   android_gfx_ctx_bind_api,
   android_gfx_ctx_set_swap_interval,
   android_gfx_ctx_set_video_mode,
   android_gfx_ctx_get_video_size,
   NULL, /* get_video_output_size */
   NULL, /* get_video_output_prev */
   NULL, /* get_video_output_next */
   android_gfx_ctx_get_metrics,
   NULL,
   android_gfx_ctx_update_window_title,
   android_gfx_ctx_check_window,
   android_gfx_ctx_set_resize,
   android_gfx_ctx_has_focus,
   android_gfx_ctx_suppress_screensaver,
   android_gfx_ctx_has_windowed,
   android_gfx_ctx_swap_buffers,
   android_gfx_ctx_input_driver,
   android_gfx_ctx_get_proc_address,
   NULL,
   NULL,
   NULL,
   "android",
   android_gfx_ctx_bind_hw_render,
};