RetroArch/gfx/context/androidegl_ctx.c

/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2012 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2012 - 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 "../gl_common.h"

#include <EGL/egl.h> /* Requires NDK r5 or newer */
#include <GLES/gl.h>

#include "../../android/native/jni/android-general.h"

#include <stdint.h>

static EGLContext g_egl_ctx;
static EGLSurface g_egl_surf;
static EGLDisplay g_egl_dpy;
static EGLConfig g_config;

GLfloat _angle;

static enum gfx_ctx_api g_api;

static int gfx_ctx_check_resolution(unsigned resolution_id)
{
   (void)resolution_id;
   return 0;
}

static unsigned gfx_ctx_get_resolution_width(unsigned resolution_id)
{
   (void)resolution_id;
   return 0;
}

static unsigned gfx_ctx_get_resolution_height(unsigned resolution_id)
{
   (void)resolution_id;
   return 0;
}

static float gfx_ctx_get_aspect_ratio(void)
{
   return 4.0f / 3.0f;
}

static void gfx_ctx_get_available_resolutions(void)
{}

static void gfx_ctx_set_swap_interval(unsigned interval)
{
   eglSwapInterval(g_egl_dpy, interval);
}

void gfx_ctx_destroy(void)
{
    eglMakeCurrent(g_egl_dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
    eglDestroyContext(g_egl_dpy, g_egl_ctx);
    eglDestroySurface(g_egl_dpy, g_egl_surf);
    eglTerminate(g_egl_dpy);
   
    g_egl_dpy = EGL_NO_DISPLAY;
    g_egl_surf = EGL_NO_SURFACE;
    g_egl_ctx = EGL_NO_CONTEXT;
    g_config   = 0;

    g_android.width = 0;
    g_android.height = 0;
    g_android.animating = 0;
}

bool gfx_ctx_init(void)
{
   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_NONE
    };
    EGLConfig config;    
    EGLint numConfigs;
    EGLint format;
    EGLint width;
    EGLint height;
    GLfloat ratio;
   
    RARCH_LOG("Initializing context\n");
   
    if ((g_egl_dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY)) == EGL_NO_DISPLAY) {
        RARCH_ERR("eglGetDisplay() returned error %d.\n", eglGetError());
        return false;
    }

    EGLint egl_major, egl_minor;
    if (!eglInitialize(g_egl_dpy, &egl_major, &egl_minor)) {
        RARCH_ERR("eglInitialize() returned error %d.\n", eglGetError());
        return false;
    }

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

    EGLint num_configs;
    if (!eglChooseConfig(g_egl_dpy, attribs, &g_config, 1, &numConfigs)) {
        RARCH_ERR("eglChooseConfig() returned error %d.\n", eglGetError());
        gfx_ctx_destroy();
        return false;
    }

    if (!eglGetConfigAttrib(g_egl_dpy, config, EGL_NATIVE_VISUAL_ID, &format)) {
        RARCH_ERR("eglGetConfigAttrib() returned error %d.\n", eglGetError());
        gfx_ctx_destroy();
        return false;
    }

    ANativeWindow_setBuffersGeometry(g_android.app->window, 0, 0, format);

    if (!(g_egl_surf = eglCreateWindowSurface(g_egl_dpy, config, g_android.app->window, 0))) {
        RARCH_ERR("eglCreateWindowSurface() returned error %d.\n", eglGetError());
        gfx_ctx_destroy();
        return false;
    }

    EGLint ctx_attribs[] =
    {
       EGL_CONTEXT_CLIENT_VERSION, 2,
       EGL_NONE
    };
   
    if (!(g_egl_ctx = eglCreateContext(g_egl_dpy, config, 0, ctx_attribs))) {
        RARCH_ERR("eglCreateContext() returned error %d.\n", eglGetError());
        gfx_ctx_destroy();
        return false;
    }
   
    if (!eglMakeCurrent(g_egl_dpy, g_egl_surf, g_egl_surf, g_egl_ctx)) {
        RARCH_ERR("eglMakeCurrent() returned error %d.\n", eglGetError());
        gfx_ctx_destroy();
        return false;
    }

    if (!eglQuerySurface(g_egl_dpy, g_egl_surf, EGL_WIDTH, &width) ||
        !eglQuerySurface(g_egl_dpy, g_egl_surf, EGL_HEIGHT, &height)) {
        RARCH_ERR("eglQuerySurface() returned error %d.\n", eglGetError());
        gfx_ctx_destroy();
        return false;
    }

    g_android.width = width;
    g_android.height = height;
    g_android.state.angle = 0;

    return true;
}

void gfx_ctx_check_window(bool *quit,
      bool *resize, unsigned *width, unsigned *height, unsigned frame_count)
{
   (void)width;
   (void)height;
   (void)frame_count;

   gl_t *gl = driver.video_data;
   *quit = false;
   *resize = false;

    // Read all pending events.
   int ident;
   int events;
   struct android_poll_source* source;
   struct android_app* state = g_android.app;

   // If not animating, we will block forever waiting for events.
   // If animating, we loop until all events are read, then continue
   // to draw the next frame of animation.
   while ((ident=ALooper_pollAll(g_android.animating ? 0 : -1, NULL, &events,
				   (void**)&source)) >= 0)
   {
      // Process this event.
      if (source != NULL)
         source->process(state, source);

      // If a sensor has data, process it now.
      if (ident == LOOPER_ID_USER && g_android.accelerometerSensor != NULL)
      {
         ASensorEvent event;
	 while (ASensorEventQueue_getEvents(g_android.sensorEventQueue, &event, 1) > 0)
         {
            //RARCH_LOG("accelerometer: x=%f y=%f z=%f.\n", event.acceleration.x, event.acceleration.y, event.acceleration.z);
         }
      }

      // Check if we are exiting.
      if (state->destroyRequested != 0)
      {
         gl->quitting = true;
	 *quit = true;
	 return;
      }
   }

   if (g_android.animating)
   {
         // Done with events; draw next animation frame.
         g_android.state.angle += .01f;

	 if (g_android.state.angle > 1)
            g_android.state.angle = 0;

	 // Drawing is throttled to the screen update rate, so there
	 // is no need to do timing here.
	 //engine_draw_frame();
   }

   if (gl->quitting)
      *quit = true;

   if (gl->should_resize)
      *resize = true;
}

void gfx_ctx_swap_buffers(void)
{
   eglSwapBuffers(g_egl_dpy, g_egl_surf);
}

void gfx_ctx_clear(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
}

static void gfx_ctx_set_blend(bool enable)
{
   if(enable)
   {
      glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
      glEnable(GL_BLEND);
   }
   else
      glDisable(GL_BLEND);
}

static void gfx_ctx_set_resize(unsigned width, unsigned height)
{
   (void)width;
   (void)height;
}

static bool gfx_ctx_menu_init(void)
{}

static void gfx_ctx_update_window_title(bool reset)
{
   (void)reset;
}

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


bool gfx_ctx_set_video_mode(
      unsigned width, unsigned height,
      unsigned bits, bool fullscreen)
{
   (void)width;
   (void)height;
   (void)bits;
   (void)fullscreen;
   return true;
}


void gfx_ctx_input_driver(const input_driver_t **input, void **input_data)
{
   *input = NULL;
   *input_data = NULL;
}

void gfx_ctx_set_filtering(unsigned index, bool set_smooth)
{
   (void)index;
   (void)set_smooth;
}

static void gfx_ctx_set_fbo(bool enable)
{
   (void)enable;
}

static void gfx_ctx_apply_fbo_state_changes(unsigned mode)
{
   (void)mode;
}

static void gfx_ctx_set_aspect_ratio(void *data, unsigned aspectratio_index)
{
   (void)data;
   (void)aspectratio_index;
}

static void gfx_ctx_set_overscan(void)
{}

static gfx_ctx_proc_t gfx_ctx_get_proc_address(const char *symbol)
{
   rarch_assert(sizeof(void*) == sizeof(void (*)(void)));
   gfx_ctx_proc_t ret;

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

   return ret;
}

static bool gfx_ctx_bind_api(enum gfx_ctx_api api)
{
   g_api = api;
   return api == GFX_CTX_OPENGL_ES_API;
}

static bool gfx_ctx_has_focus(void)
{
   return true;
}

const gfx_ctx_driver_t gfx_ctx_android = {
   gfx_ctx_init,
   gfx_ctx_destroy,
   gfx_ctx_bind_api,
   gfx_ctx_set_swap_interval,
   gfx_ctx_set_video_mode,
   gfx_ctx_get_video_size,
   NULL,
   gfx_ctx_update_window_title,
   gfx_ctx_check_window,
   gfx_ctx_set_resize,
   gfx_ctx_has_focus,
   gfx_ctx_swap_buffers,
   gfx_ctx_input_driver,
   NULL,
   "android",

#ifdef RARCH_CONSOLE
   // RARCH_CONSOLE stuff.
   gfx_ctx_set_filtering,
   gfx_ctx_get_available_resolutions,
   gfx_ctx_check_resolution,

#ifdef HAVE_CG_MENU
   gfx_ctx_menu_init,
#else
   NULL,
#endif

   gfx_ctx_set_fbo,
   gfx_ctx_apply_fbo_state_changes,
#endif
};