From e268a47e483b139b3c337c5fc37e3551138fbb99 Mon Sep 17 00:00:00 2001
From: twinaphex <autechre1024@hotmail.com>
Date: Fri, 24 May 2013 00:08:10 +0200
Subject: [PATCH] (NEON ARM) Add NEON ARM core option (Enhanced resolution -
 slow)

---
 frontend/libretro.c | 41 ++++++++++++++++++++++++++++++++++++++++-
 frontend/libretro.h |  9 ++++++++-
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 7a7c2ef9..8fb58b79 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -230,7 +230,22 @@ void out_register_libretro(struct out_driver *drv)
 }
 
 /* libretro */
-void retro_set_environment(retro_environment_t cb) { environ_cb = cb; }
+void retro_set_environment(retro_environment_t cb)
+{
+#ifdef __ARM_NEON__
+   static const struct retro_variable vars[] = {
+      { "neon_enhancement_enable", "Enhanced resolution (slow); disabled|enabled" },
+      { NULL, NULL },
+   };
+
+   environ_cb = cb;
+
+   cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void*)vars);
+#else
+   environ_cb = cb;
+#endif
+}
+
 void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
 void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
 void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
@@ -710,11 +725,33 @@ static const unsigned short retro_psx_map[] = {
 };
 #define RETRO_PSX_MAP_LEN (sizeof(retro_psx_map) / sizeof(retro_psx_map[0]))
 
+static void update_variables(void)
+{
+#ifdef __ARM_NEON__
+   struct retro_variable var;
+   var.value = NULL;
+   var.key = "neon_enhancement_enable";
+
+   if (!environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) || !var.value)
+      return;
+
+   if (strcmp(var.value, "disabled") == 0)
+      pl_rearmed_cbs.gpu_neon.enhancement_enable = 0;
+   else if (strcmp(var.value, "enabled") == 0)
+      pl_rearmed_cbs.gpu_neon.enhancement_enable = 1;
+#endif
+}
+
 void retro_run(void) 
 {
 	int i;
 
 	input_poll_cb();
+
+   bool updated = false;
+   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
+      update_variables();
+
 	in_keystate = 0;
 	for (i = 0; i < RETRO_PSX_MAP_LEN; i++)
 		if (input_state_cb(1, RETRO_DEVICE_JOYPAD, 0, i))
@@ -795,6 +832,8 @@ void retro_init(void)
 	SaveFuncs.write = save_write;
 	SaveFuncs.seek = save_seek;
 	SaveFuncs.close = save_close;
+
+   update_variables();
 }
 
 void retro_deinit(void)
diff --git a/frontend/libretro.h b/frontend/libretro.h
index b02855ae..dc5b52bc 100755
--- a/frontend/libretro.h
+++ b/frontend/libretro.h
@@ -452,6 +452,13 @@ enum retro_mod
                                            // Result is set to true if some variables are updated by
                                            // frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE.
                                            // Variables should be queried with GET_VARIABLE.
+                                           //
+#define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18
+                                           // const bool * --
+                                           // If true, the libretro implementation supports calls to retro_load_game() with NULL as argument.
+                                           // Used by cores which can run without particular game data.
+                                           // This should be called within retro_set_environment() only.
+                                          
 
 // Pass this to retro_video_refresh_t if rendering to hardware.
 // Passing NULL to retro_video_refresh_t is still a frame dupe as normal.
@@ -496,7 +503,7 @@ typedef void (*retro_keyboard_event_t)(bool down, unsigned keycode, uint32_t cha
 
 struct retro_keyboard_callback
 {
-    retro_keyboard_event_t callback;
+   retro_keyboard_event_t callback;
 };
 
 // Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE.
-- 
2.39.2