Added raw fbdev/evdev/ALSA render backend

5 files changed, 2087 insertions, 3 deletions

diff --git a/Makefile b/Makefile
index 96f1eea..55fc6d2 100644
--- a/Makefile
+++ b/Makefile
@@ -38,12 +38,21 @@ ifeq ($(OS),Darwin)
 LIBS=sdl2 glew
 FONT:=nuklear_ui/font_mac.o
 else
+
+ifdef USE_FBDEV
+LIBS=alsa
+ifndef NOGL
+LIBS+=glesv2 egl
+endif
+CFLAGS+= -DUSE_GLES -DUSE_FBDEV -pthread
+else
 ifdef USE_GLES
 LIBS=sdl2 glesv2
 CFLAGS+= -DUSE_GLES
 else
 LIBS=sdl2 glew gl
 endif #USE_GLES
+endif #USE_FBDEV
 FONT:=nuklear_ui/font.o
 endif #Darwin
 
@@ -88,6 +97,9 @@ LDFLAGS:=-lm
 else
 CFLAGS:=$(shell pkg-config --cflags-only-I $(LIBS)) $(CFLAGS)
 LDFLAGS:=-lm $(shell pkg-config --libs $(LIBS))
+ifdef USE_FBDEV
+LDFLAGS+= -pthread
+endif
 endif #libblastem.so
 
 ifeq ($(OS),Darwin)
@@ -168,8 +180,13 @@ Z80OBJS=z80inst.o z80_to_x86.o
 endif
 AUDIOOBJS=ym2612.o psg.o wave.o
 CONFIGOBJS=config.o tern.o util.o paths.o 
-NUKLEAROBJS=$(FONT) nuklear_ui/blastem_nuklear.o nuklear_ui/sfnt.o controller_info.o
-RENDEROBJS=render_sdl.o ppm.o
+NUKLEAROBJS=$(FONT) nuklear_ui/blastem_nuklear.o nuklear_ui/sfnt.o
+RENDEROBJS=ppm.o controller_info.o
+ifdef USE_FBDEV
+RENDEROBJS+= render_fbdev.o
+else
+RENDEROBJS+= render_sdl.o
+endif
 	
 ifdef NOZLIB
 CFLAGS+= -DDISABLE_ZLIB
diff --git a/controller_info.c b/controller_info.c
index a34265e..41ab548 100644
--- a/controller_info.c
+++ b/controller_info.c
@@ -1,5 +1,8 @@
 #include <string.h>
+#include <stdlib.h>
+#ifndef USE_FBDEV
 #include "render_sdl.h"
+#endif
 #include "controller_info.h"
 #include "config.h"
 #include "util.h"
@@ -70,6 +73,7 @@ static void load_ctype_config(void)
 
 controller_info get_controller_info(int joystick)
 {
+#ifndef USE_FBDEV
 	load_ctype_config();
 	char guid_string[33];
 	SDL_Joystick *stick = render_get_joystick(joystick);
@@ -148,6 +152,9 @@ controller_info get_controller_info(int joystick)
 			return res;
 		}
 	}
+#else
+	const char *name = "Unknown";
+#endif
 	//default to a 360
 	return (controller_info){
 		.type = TYPE_GENERIC_MAPPING,
@@ -159,6 +166,7 @@ controller_info get_controller_info(int joystick)
 
 static void mappings_iter(char *key, tern_val val, uint8_t valtype, void *data)
 {
+#ifndef USE_FBDEV
 	if (valtype != TVAL_NODE) {
 		return;
 	}
@@ -169,6 +177,7 @@ static void mappings_iter(char *key, tern_val val, uint8_t valtype, void *data)
 		SDL_GameControllerAddMapping(full);
 		free(full);
 	}
+#endif
 }
 
 void controller_add_mappings(void)
@@ -181,6 +190,7 @@ void controller_add_mappings(void)
 
 void save_controller_info(int joystick, controller_info *info)
 {
+#ifndef USE_FBDEV
 	char guid_string[33];
 	SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(render_get_joystick(joystick)), guid_string, sizeof(guid_string));
 	tern_node *existing = tern_find_node(info_config, guid_string);
@@ -188,17 +198,19 @@ void save_controller_info(int joystick, controller_info *info)
 	existing = tern_insert_ptr(existing, "variant",  (void *)variant_names[info->variant]);
 	info_config = tern_insert_node(info_config, guid_string, existing);
 	persist_config_at(info_config, "controller_types.cfg");
-	
+#endif	
 }
 
 void save_controller_mapping(int joystick, char *mapping_string)
 {
+#ifndef USE_FBDEV
 	char guid_string[33];
 	SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(render_get_joystick(joystick)), guid_string, sizeof(guid_string));
 	tern_node *existing = tern_find_node(info_config, guid_string);
 	existing = tern_insert_ptr(existing, "mapping", mapping_string);
 	info_config = tern_insert_node(info_config, guid_string, existing);
 	persist_config_at(info_config, "controller_types.cfg");
+#endif
 }
 
 char const *labels_xbox[] = {
@@ -255,10 +267,12 @@ static const char** label_source(controller_info *info)
 
 const char *get_button_label(controller_info *info, int button)
 {
+#ifndef USE_FBDEV
 	if (button >= SDL_CONTROLLER_BUTTON_DPAD_UP) {
 		static char const * dirs[] = {"Up", "Down", "Left", "Right"};
 		return dirs[button - SDL_CONTROLLER_BUTTON_DPAD_UP];
 	}
+#endif
 	return label_source(info)[button];
 }
 
@@ -267,11 +281,15 @@ static char const *axis_labels[] = {
 };
 const char *get_axis_label(controller_info *info, int axis)
 {
+#ifndef USE_FBDEV
 	if (axis < SDL_CONTROLLER_AXIS_TRIGGERLEFT) {
 		return axis_labels[axis];
 	} else {
 		return label_source(info)[axis - SDL_CONTROLLER_AXIS_TRIGGERLEFT + SDL_CONTROLLER_BUTTON_RIGHTSHOULDER + 1];
 	}
+#else
+	return NULL;
+#endif
 }
 
 char *make_controller_type_key(controller_info *info)
@@ -316,6 +334,9 @@ char *make_human_readable_type_name(controller_info *info)
 		prefix = "Normal ";
 	} else {
 		static const char *parts[] = {"6 button (", NULL, "/", NULL, ") "};
+#ifdef USE_FBDEV
+		parts[1] = parts[3] = "??";
+#else
 		if (info->variant == VARIANT_6B_BUMPERS) {
 			parts[1] = get_button_label(info, SDL_CONTROLLER_BUTTON_LEFTSHOULDER);
 			parts[3] = get_button_label(info, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);
@@ -323,6 +344,7 @@ char *make_human_readable_type_name(controller_info *info)
 			parts[1] = get_button_label(info, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);
 			parts[3] = get_axis_label(info, SDL_CONTROLLER_AXIS_TRIGGERRIGHT);
 		}
+#endif
 		prefix = alloc_concat_m(5, parts);
 	}
 	char *ret = alloc_concat(prefix, base);
diff --git a/render.h b/render.h
index d1ff7c0..06ac26c 100644
--- a/render.h
+++ b/render.h
@@ -7,6 +7,10 @@
 #define RENDER_H_
 
 #ifndef IS_LIB
+#ifdef USE_FBDEV
+#include "special_keys_evdev.h"
+#define render_relative_mouse(V)
+#else
 #include <SDL.h>
 #define RENDERKEY_UP       SDLK_UP
 #define RENDERKEY_DOWN     SDLK_DOWN
@@ -62,6 +66,7 @@
 #define RENDER_DPAD_RIGHT  SDL_HAT_RIGHT
 #define render_relative_mouse SDL_SetRelativeMouseMode
 #endif
+#endif
 
 #define MAX_JOYSTICKS 8
 #define MAX_MICE 8
diff --git a/render_fbdev.c b/render_fbdev.c
new file mode 100755
index 0000000..f5a10ba
--- /dev/null
+++ b/render_fbdev.c
@@ -0,0 +1,1981 @@
+/*
+ Copyright 2013 Michael Pavone
+ This file is part of BlastEm.
+ BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <linux/fb.h>
+#include <linux/input.h>
+#include <linux/kd.h>
+#include <alsa/asoundlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <dirent.h>
+#include "render.h"
+#include "blastem.h"
+#include "genesis.h"
+#include "bindings.h"
+#include "util.h"
+#include "paths.h"
+#include "ppm.h"
+#include "png.h"
+#include "config.h"
+#include "controller_info.h"
+
+#ifndef DISABLE_OPENGL
+#include <EGL/egl.h>
+#include <GLES2/gl2.h>
+#ifdef USE_MALI
+//Mali GLES headers don't seem to define GLchar for some reason
+typedef char GLchar;
+#endif
+#endif
+
+#define MAX_EVENT_POLL_PER_FRAME 2
+
+static EGLContext main_context;
+
+static int main_width, main_height, windowed_width, windowed_height, is_fullscreen;
+
+static uint8_t render_gl = 1;
+static uint8_t scanlines = 0;
+
+static uint32_t last_frame = 0;
+static snd_pcm_uframes_t buffer_samples;
+static unsigned int output_channels, sample_rate;
+static uint32_t missing_count;
+
+
+static uint8_t quitting = 0;
+
+struct audio_source {
+	int16_t  *front;
+	int16_t  *back;
+	double   dt;
+	uint64_t buffer_fraction;
+	uint64_t buffer_inc;
+	uint32_t buffer_pos;
+	uint32_t read_start;
+	uint32_t read_end;
+	uint32_t lowpass_alpha;
+	uint32_t mask;
+	int16_t  last_left;
+	int16_t  last_right;
+	uint8_t  num_channels;
+	uint8_t  front_populated;
+};
+
+static audio_source *audio_sources[8];
+static audio_source *inactive_audio_sources[8];
+static uint8_t num_audio_sources;
+static uint8_t num_inactive_audio_sources;
+static uint32_t min_buffered;
+
+typedef int32_t (*mix_func)(audio_source *audio, void *vstream, int len);
+
+static int32_t mix_s16(audio_source *audio, void *vstream, int len)
+{
+	int samples = len/(sizeof(int16_t)*output_channels);
+	int16_t *stream = vstream;
+	int16_t *end = stream + output_channels*samples;
+	int16_t *src = audio->front;
+	uint32_t i = audio->read_start;
+	uint32_t i_end = audio->read_end;
+	int16_t *cur = stream;
+	size_t first_add = output_channels > 1 ? 1 : 0, second_add = output_channels > 1 ? output_channels - 1 : 1;
+	if (audio->num_channels == 1) {
+		while (cur < end && i != i_end)
+		{
+			*cur += src[i];
+			cur += first_add;
+			*cur += src[i++];
+			cur += second_add;
+			i &= audio->mask;
+		}
+	} else {
+		while (cur < end && i != i_end)
+		{
+			*cur += src[i++];
+			cur += first_add;
+			*cur += src[i++];
+			cur += second_add;
+			i &= audio->mask;
+		}
+	}
+	
+	if (cur != end) {
+		printf("Underflow of %d samples, read_start: %d, read_end: %d, mask: %X\n", (int)(end-cur)/2, audio->read_start, audio->read_end, audio->mask);
+	}
+	if (cur != end) {
+		//printf("Underflow of %d samples, read_start: %d, read_end: %d, mask: %X\n", (int)(end-cur)/2, audio->read_start, audio->read_end, audio->mask);
+		return (cur-end)/2;
+	} else {
+		return ((i_end - i) & audio->mask) / audio->num_channels;
+	}
+}
+
+static int32_t mix_f32(audio_source *audio, void *vstream, int len)
+{
+	int samples = len/(sizeof(float)*output_channels);
+	float *stream = vstream;
+	float *end = stream + output_channels*samples;
+	int16_t *src = audio->front;
+	uint32_t i = audio->read_start;
+	uint32_t i_end = audio->read_end;
+	float *cur = stream;
+	size_t first_add = output_channels > 1 ? 1 : 0, second_add = output_channels > 1 ? output_channels - 1 : 1;
+	if (audio->num_channels == 1) {
+		while (cur < end && i != i_end)
+		{
+			*cur += ((float)src[i]) / 0x7FFF;
+			cur += first_add;
+			*cur += ((float)src[i++]) / 0x7FFF;
+			cur += second_add;
+			i &= audio->mask;
+		}
+	} else {
+		while(cur < end && i != i_end)
+		{
+			*cur += ((float)src[i++]) / 0x7FFF;
+			cur += first_add;
+			*cur += ((float)src[i++]) / 0x7FFF;
+			cur += second_add;
+			i &= audio->mask;
+		}
+	}
+	if (cur != end) {
+		printf("Underflow of %d samples, read_start: %d, read_end: %d, mask: %X\n", (int)(end-cur)/2, audio->read_start, audio->read_end, audio->mask);
+		return (cur-end)/2;
+	} else {
+		return ((i_end - i) & audio->mask) / audio->num_channels;
+	}
+}
+
+static int32_t mix_null(audio_source *audio, void *vstream, int len)
+{
+	return 0;
+}
+
+static mix_func mix;
+
+static void render_close_audio()
+{
+
+}
+
+#define BUFFER_INC_RES 0x40000000UL
+
+void render_audio_adjust_clock(audio_source *src, uint64_t master_clock, uint64_t sample_divider)
+{
+	src->buffer_inc = ((BUFFER_INC_RES * (uint64_t)sample_rate) / master_clock) * sample_divider;
+}
+
+audio_source *render_audio_source(uint64_t master_clock, uint64_t sample_divider, uint8_t channels)
+{
+	audio_source *ret = NULL;
+	uint32_t alloc_size = channels * buffer_samples;
+	if (num_audio_sources < 8) {
+		ret = malloc(sizeof(audio_source));
+		ret->back = malloc(alloc_size * sizeof(int16_t));
+		ret->front = malloc(alloc_size * sizeof(int16_t));
+		ret->front_populated = 0;
+		ret->num_channels = channels;
+		audio_sources[num_audio_sources++] = ret;
+	}
+	if (!ret) {
+		fatal_error("Too many audio sources!");
+	} else {
+		render_audio_adjust_clock(ret, master_clock, sample_divider);
+		double lowpass_cutoff = get_lowpass_cutoff(config);
+		double rc = (1.0 / lowpass_cutoff) / (2.0 * M_PI);
+		ret->dt = 1.0 / ((double)master_clock / (double)(sample_divider));
+		double alpha = ret->dt / (ret->dt + rc);
+		ret->lowpass_alpha = (int32_t)(((double)0x10000) * alpha);
+		ret->buffer_pos = 0;
+		ret->buffer_fraction = 0;
+		ret->last_left = ret->last_right = 0;
+		ret->read_start = 0;
+		ret->read_end = buffer_samples * channels;
+		ret->mask = 0xFFFFFFFF;
+	}
+	return ret;
+}
+
+void render_pause_source(audio_source *src)
+{
+	for (uint8_t i = 0; i < num_audio_sources; i++)
+	{
+		if (audio_sources[i] == src) {
+			audio_sources[i] = audio_sources[--num_audio_sources];
+			break;
+		}
+	}
+	inactive_audio_sources[num_inactive_audio_sources++] = src;
+}
+
+void render_resume_source(audio_source *src)
+{
+	if (num_audio_sources < 8) {
+		audio_sources[num_audio_sources++] = src;
+	}
+	for (uint8_t i = 0; i < num_inactive_audio_sources; i++)
+	{
+		if (inactive_audio_sources[i] == src) {
+			inactive_audio_sources[i] = inactive_audio_sources[--num_inactive_audio_sources];
+		}
+	}
+}
+
+void render_free_source(audio_source *src)
+{
+	render_pause_source(src);
+	
+	free(src->front);
+	free(src->back);
+	free(src);
+}
+snd_pcm_t *audio_handle;
+static void do_audio_ready(audio_source *src)
+{
+	if (src->front_populated) {
+		fatal_error("Audio source filled up a buffer a second time before other sources finished their first\n");
+	}
+	int16_t *tmp = src->front;
+	src->front = src->back;
+	src->back = tmp;
+	src->front_populated = 1;
+	src->buffer_pos = 0;
+	
+	for (uint8_t i = 0; i < num_audio_sources; i++)
+	{
+		if (!audio_sources[i]->front_populated) {
+			//at least one audio source is not ready yet.
+			return;
+		}
+	}
+	
+	size_t bytes = (mix == mix_s16 ? sizeof(int16_t) : sizeof(float)) * output_channels * buffer_samples;
+	void *buffer = malloc(bytes);
+	for (uint8_t i = 0; i < num_audio_sources; i++)
+	{
+		mix(audio_sources[i], buffer, bytes);
+		audio_sources[i]->front_populated = 0;
+	}
+	int frames = snd_pcm_writei(audio_handle, buffer, buffer_samples);
+	if (frames < 0) {
+		frames = snd_pcm_recover(audio_handle, frames, 0);
+	}
+	if (frames < 0) {
+		fprintf(stderr, "Failed to write samples: %s\n", snd_strerror(frames));
+	}
+}
+
+static int16_t lowpass_sample(audio_source *src, int16_t last, int16_t current)
+{
+	int32_t tmp = current * src->lowpass_alpha + last * (0x10000 - src->lowpass_alpha);
+	current = tmp >> 16;
+	return current;
+}
+
+static void interp_sample(audio_source *src, int16_t last, int16_t current)
+{
+	int64_t tmp = last * ((src->buffer_fraction << 16) / src->buffer_inc);
+	tmp += current * (0x10000 - ((src->buffer_fraction << 16) / src->buffer_inc));
+	src->back[src->buffer_pos++] = tmp >> 16;
+}
+
+void render_put_mono_sample(audio_source *src, int16_t value)
+{
+	value = lowpass_sample(src, src->last_left, value);
+	src->buffer_fraction += src->buffer_inc;
+	uint32_t base = 0;
+	while (src->buffer_fraction > BUFFER_INC_RES)
+	{
+		src->buffer_fraction -= BUFFER_INC_RES;
+		interp_sample(src, src->last_left, value);
+		
+		if (((src->buffer_pos - base) & src->mask) >= buffer_samples) {
+			do_audio_ready(src);
+		}
+		src->buffer_pos &= src->mask;
+	}
+	src->last_left = value;
+}
+
+void render_put_stereo_sample(audio_source *src, int16_t left, int16_t right)
+{
+	left = lowpass_sample(src, src->last_left, left);
+	right = lowpass_sample(src, src->last_right, right);
+	src->buffer_fraction += src->buffer_inc;
+	uint32_t base = 0;
+	while (src->buffer_fraction > BUFFER_INC_RES)
+	{
+		src->buffer_fraction -= BUFFER_INC_RES;
+		
+		interp_sample(src, src->last_left, left);
+		interp_sample(src, src->last_right, right);
+		
+		if (((src->buffer_pos - base) & src->mask)/2 >= buffer_samples) {
+			do_audio_ready(src);
+		}
+		src->buffer_pos &= src->mask;
+	}
+	src->last_left = left;
+	src->last_right = right;
+}
+
+int render_width()
+{
+	return main_width;
+}
+
+int render_height()
+{
+	return main_height;
+}
+
+int render_fullscreen()
+{
+	return 1;
+}
+
+uint32_t red_shift, blue_shift, green_shift;
+uint32_t render_map_color(uint8_t r, uint8_t g, uint8_t b)
+{
+	return r << red_shift | g << green_shift | b << blue_shift;
+}
+
+#ifndef DISABLE_OPENGL
+static GLuint textures[3], buffers[2], vshader, fshader, program, un_textures[2], un_width, un_height, at_pos;
+
+static GLfloat vertex_data_default[] = {
+	-1.0f, -1.0f,
+	 1.0f, -1.0f,
+	-1.0f,  1.0f,
+	 1.0f,  1.0f
+};
+
+static GLfloat vertex_data[8];
+
+static const GLushort element_data[] = {0, 1, 2, 3};
+
+static const GLchar shader_prefix[] =
+#ifdef USE_GLES
+	"#version 100\n";
+#else
+	"#version 110\n"
+	"#define lowp\n"
+	"#define mediump\n"
+	"#define highp\n";
+#endif
+
+static GLuint load_shader(char * fname, GLenum shader_type)
+{
+	char const * parts[] = {get_home_dir(), "/.config/blastem/shaders/", fname};
+	char * shader_path = alloc_concat_m(3, parts);
+	FILE * f = fopen(shader_path, "rb");
+	free(shader_path);
+	GLchar * text;
+	long fsize;
+	if (f) {
+		fsize = file_size(f);
+		text = malloc(fsize);
+		if (fread(text, 1, fsize, f) != fsize) {
+			warning("Error reading from shader file %s\n", fname);
+			free(text);
+			return 0;
+		}
+	} else {
+		shader_path = path_append("shaders", fname);
+		uint32_t fsize32;
+		text = read_bundled_file(shader_path, &fsize32);
+		free(shader_path);
+		if (!text) {
+			warning("Failed to open shader file %s for reading\n", fname);
+			return 0;
+		}
+		fsize = fsize32;
+	}
+	
+	if (strncmp(text, "#version", strlen("#version"))) {
+		GLchar *tmp = text;
+		text = alloc_concat(shader_prefix, tmp);
+		free(tmp);
+		fsize += strlen(shader_prefix);
+	}
+	GLuint ret = glCreateShader(shader_type);
+	glShaderSource(ret, 1, (const GLchar **)&text, (const GLint *)&fsize);
+	free(text);
+	glCompileShader(ret);
+	GLint compile_status, loglen;
+	glGetShaderiv(ret, GL_COMPILE_STATUS, &compile_status);
+	if (!compile_status) {
+		glGetShaderiv(ret, GL_INFO_LOG_LENGTH, &loglen);
+		text = malloc(loglen);
+		glGetShaderInfoLog(ret, loglen, NULL, text);
+		warning("Shader %s failed to compile:\n%s\n", fname, text);
+		free(text);
+		glDeleteShader(ret);
+		return 0;
+	}
+	return ret;
+}
+#endif
+
+static uint32_t texture_buf[513 * 512 * 2];
+#ifdef DISABLE_OPENGL
+#define RENDER_FORMAT SDL_PIXELFORMAT_ARGB8888
+#else
+#ifdef USE_GLES
+#define INTERNAL_FORMAT GL_RGBA
+#define SRC_FORMAT GL_RGBA
+#define RENDER_FORMAT SDL_PIXELFORMAT_ABGR8888
+#else
+#define INTERNAL_FORMAT GL_RGBA8
+#define SRC_FORMAT GL_BGRA
+#define RENDER_FORMAT SDL_PIXELFORMAT_ARGB8888
+#endif
+static void gl_setup()
+{
+	tern_val def = {.ptrval = "linear"};
+	char *scaling = tern_find_path_default(config, "video\0scaling\0", def, TVAL_PTR).ptrval;
+	GLint filter = strcmp(scaling, "linear") ? GL_NEAREST : GL_LINEAR;
+	glGenTextures(3, textures);
+	for (int i = 0; i < 3; i++)
+	{
+		glBindTexture(GL_TEXTURE_2D, textures[i]);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		if (i < 2) {
+			//TODO: Fixme for PAL + invalid display mode
+			glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT, 512, 512, 0, SRC_FORMAT, GL_UNSIGNED_BYTE, texture_buf);
+		} else {
+			uint32_t blank = 255 << 24;
+			glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT, 1, 1, 0, SRC_FORMAT, GL_UNSIGNED_BYTE, &blank);
+		}
+	}
+	glGenBuffers(2, buffers);
+	glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_data), vertex_data, GL_STATIC_DRAW);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(element_data), element_data, GL_STATIC_DRAW);
+	def.ptrval = "default.v.glsl";
+	vshader = load_shader(tern_find_path_default(config, "video\0vertex_shader\0", def, TVAL_PTR).ptrval, GL_VERTEX_SHADER);
+	def.ptrval = "default.f.glsl";
+	fshader = load_shader(tern_find_path_default(config, "video\0fragment_shader\0", def, TVAL_PTR).ptrval, GL_FRAGMENT_SHADER);
+	program = glCreateProgram();
+	glAttachShader(program, vshader);
+	glAttachShader(program, fshader);
+	glLinkProgram(program);
+	GLint link_status;
+	glGetProgramiv(program, GL_LINK_STATUS, &link_status);
+	if (!link_status) {
+		fputs("Failed to link shader program\n", stderr);
+		exit(1);
+	}
+	un_textures[0] = glGetUniformLocation(program, "textures[0]");
+	un_textures[1] = glGetUniformLocation(program, "textures[1]");
+	un_width = glGetUniformLocation(program, "width");
+	un_height = glGetUniformLocation(program, "height");
+	at_pos = glGetAttribLocation(program, "pos");
+}
+
+static void gl_teardown()
+{
+	glDeleteProgram(program);
+	glDeleteShader(vshader);
+	glDeleteShader(fshader);
+	glDeleteBuffers(2, buffers);
+	glDeleteTextures(3, textures);
+}
+#endif
+
+static uint8_t texture_init;
+static void render_alloc_surfaces()
+{
+	if (texture_init) {
+		return;
+	}
+	texture_init = 1;
+#ifndef DISABLE_OPENGL
+	if (render_gl) {
+		gl_setup();
+	}
+#endif
+}
+
+static void free_surfaces(void)
+{
+	texture_init = 0;
+}
+
+static char * caption = NULL;
+static char * fps_caption = NULL;
+
+static void render_quit()
+{
+	render_close_audio();
+	free_surfaces();
+#ifndef DISABLE_OPENGL
+	if (render_gl) {
+		gl_teardown();
+		//FIXME: replace with EGL equivalent
+		//SDL_GL_DeleteContext(main_context);
+	}
+#endif
+}
+
+static float config_aspect()
+{
+	static float aspect = 0.0f;
+	if (aspect == 0.0f) {
+		char *config_aspect = tern_find_path_default(config, "video\0aspect\0", (tern_val){.ptrval = "4:3"}, TVAL_PTR).ptrval;
+		if (strcmp("stretch", config_aspect)) {
+			aspect = 4.0f/3.0f;
+			char *end;
+			float aspect_numerator = strtof(config_aspect, &end);
+			if (aspect_numerator > 0.0f && *end == ':') {
+				float aspect_denominator = strtof(end+1, &end);
+				if (aspect_denominator > 0.0f && !*end) {
+					aspect = aspect_numerator / aspect_denominator;
+				}
+			}
+		} else {
+			aspect = -1.0f;
+		}
+	}
+	return aspect;
+}
+
+static void update_aspect()
+{
+	//reset default values
+#ifndef DISABLE_OPENGL
+	memcpy(vertex_data, vertex_data_default, sizeof(vertex_data));
+#endif
+	if (config_aspect() > 0.0f) {
+		float aspect = (float)main_width / main_height;
+		if (fabs(aspect - config_aspect()) < 0.01f) {
+			//close enough for government work
+			return;
+		}
+#ifndef DISABLE_OPENGL
+		if (render_gl) {
+			for (int i = 0; i < 4; i++)
+			{
+				if (aspect > config_aspect()) {
+					vertex_data[i*2] *= config_aspect()/aspect;
+				} else {
+					vertex_data[i*2+1] *= aspect/config_aspect();
+				}
+			}
+		} else {
+#endif
+		//TODO: Maybe do some stuff for non-integer scaling in raw fbdev copy
+#ifndef DISABLE_OPENGL
+		}
+#endif
+	}
+}
+
+/*
+static ui_render_fun on_context_destroyed, on_context_created;
+void render_set_gl_context_handlers(ui_render_fun destroy, ui_render_fun create)
+{
+	on_context_destroyed = destroy;
+	on_context_created = create;
+}*/
+
+static uint8_t scancode_map[128] = {
+	[KEY_A] = 0x1C,
+	[KEY_B] = 0x32,
+	[KEY_C] = 0x21,
+	[KEY_D] = 0x23,
+	[KEY_E] = 0x24,
+	[KEY_F] = 0x2B,
+	[KEY_G] = 0x34,
+	[KEY_H] = 0x33,
+	[KEY_I] = 0x43,
+	[KEY_J] = 0x3B,
+	[KEY_K] = 0x42,
+	[KEY_L] = 0x4B,
+	[KEY_M] = 0x3A,
+	[KEY_N] = 0x31,
+	[KEY_O] = 0x44,
+	[KEY_P] = 0x4D,
+	[KEY_Q] = 0x15,
+	[KEY_R] = 0x2D,
+	[KEY_S] = 0x1B,
+	[KEY_T] = 0x2C,
+	[KEY_U] = 0x3C,
+	[KEY_V] = 0x2A,
+	[KEY_W] = 0x1D,
+	[KEY_X] = 0x22,
+	[KEY_Y] = 0x35,
+	[KEY_Z] = 0x1A,
+	[KEY_1] = 0x16,
+	[KEY_2] = 0x1E,
+	[KEY_3] = 0x26,
+	[KEY_4] = 0x25,
+	[KEY_5] = 0x2E,
+	[KEY_6] = 0x36,
+	[KEY_7] = 0x3D,
+	[KEY_8] = 0x3E,
+	[KEY_9] = 0x46,
+	[KEY_0] = 0x45,
+	[KEY_ENTER] = 0x5A,
+	[KEY_ESC] = 0x76,
+	[KEY_SPACE] = 0x29,
+	[KEY_TAB] = 0x0D,
+	[KEY_BACKSPACE] = 0x66,
+	[KEY_MINUS] = 0x4E,
+	[KEY_EQUAL] = 0x55,
+	[KEY_LEFTBRACE] = 0x54,
+	[KEY_RIGHTBRACE] = 0x5B,
+	[KEY_BACKSLASH] = 0x5D,
+	[KEY_SEMICOLON] = 0x4C,
+	[KEY_APOSTROPHE] = 0x52,
+	[KEY_GRAVE] = 0x0E,
+	[KEY_COMMA] = 0x41,
+	[KEY_DOT] = 0x49,
+	[KEY_SLASH] = 0x4A,
+	[KEY_CAPSLOCK] = 0x58,
+	[KEY_F1] = 0x05,
+	[KEY_F2] = 0x06,
+	[KEY_F3] = 0x04,
+	[KEY_F4] = 0x0C,
+	[KEY_F5] = 0x03,
+	[KEY_F6] = 0x0B,
+	[KEY_F7] = 0x83,
+	[KEY_F8] = 0x0A,
+	[KEY_F9] = 0x01,
+	[KEY_F10] = 0x09,
+	[KEY_F11] = 0x78,
+	[KEY_F12] = 0x07,
+	[KEY_LEFTCTRL] = 0x14,
+	[KEY_LEFTSHIFT] = 0x12,
+	[KEY_LEFTALT] = 0x11,
+	[KEY_RIGHTCTRL] = 0x18,
+	[KEY_RIGHTSHIFT] = 0x59,
+	[KEY_RIGHTALT] = 0x17,
+	[KEY_INSERT] = 0x81,
+	[KEY_PAUSE] = 0x82,
+	[KEY_SYSRQ] = 0x84,
+	[KEY_SCROLLLOCK] = 0x7E,
+	[KEY_DELETE] = 0x85,
+	[KEY_LEFT] = 0x86,
+	[KEY_HOME] = 0x87,
+	[KEY_END] = 0x88,
+	[KEY_UP] = 0x89,
+	[KEY_DOWN] = 0x8A,
+	[KEY_PAGEUP] = 0x8B,
+	[KEY_PAGEDOWN] = 0x8C,
+	[KEY_RIGHT] = 0x8D,
+	[KEY_NUMLOCK] = 0x77,
+	[KEY_KPSLASH] = 0x80,
+	[KEY_KPASTERISK] = 0x7C,
+	[KEY_KPMINUS] = 0x7B,
+	[KEY_KPPLUS] = 0x79,
+	[KEY_KPENTER] = 0x19,
+	[KEY_KP1] = 0x69,
+	[KEY_KP2] = 0x72,
+	[KEY_KP3] = 0x7A,
+	[KEY_KP4] = 0x6B,
+	[KEY_KP5] = 0x73,
+	[KEY_KP6] = 0x74,
+	[KEY_KP7] = 0x6C,
+	[KEY_KP8] = 0x75,
+	[KEY_KP9] = 0x7D,
+	[KEY_KP0] = 0x70,
+	[KEY_KPDOT] = 0x71,
+};
+
+#include "special_keys_evdev.h"
+static uint8_t sym_map[128] = {
+	[KEY_A] = 'a',
+	[KEY_B] = 'b',
+	[KEY_C] = 'c',
+	[KEY_D] = 'd',
+	[KEY_E] = 'e',
+	[KEY_F] = 'f',
+	[KEY_G] = 'g',
+	[KEY_H] = 'h',
+	[KEY_I] = 'i',
+	[KEY_J] = 'j',
+	[KEY_K] = 'k',
+	[KEY_L] = 'l',
+	[KEY_M] = 'm',
+	[KEY_N] = 'n',
+	[KEY_O] = 'o',
+	[KEY_P] = 'p',
+	[KEY_Q] = 'q',
+	[KEY_R] = 'r',
+	[KEY_S] = 's',
+	[KEY_T] = 't',
+	[KEY_U] = 'u',
+	[KEY_V] = 'v',
+	[KEY_W] = 'w',
+	[KEY_X] = 'x',
+	[KEY_Y] = 'y',
+	[KEY_Z] = 'z',
+	[KEY_1] = '1',
+	[KEY_2] = '2',
+	[KEY_3] = '3',
+	[KEY_4] = '4',
+	[KEY_5] = '5',
+	[KEY_6] = '6',
+	[KEY_7] = '7',
+	[KEY_8] = '8',
+	[KEY_9] = '9',
+	[KEY_0] = '0',
+	[KEY_ENTER] = '\r',
+	[KEY_SPACE] = ' ',
+	[KEY_TAB] = '\t',
+	[KEY_BACKSPACE] = '\b',
+	[KEY_MINUS] = '-',
+	[KEY_EQUAL] = '=',
+	[KEY_LEFTBRACE] = '[',
+	[KEY_RIGHTBRACE] = ']',
+	[KEY_BACKSLASH] = '\\',
+	[KEY_SEMICOLON] = ';',
+	[KEY_APOSTROPHE] = '\'',
+	[KEY_GRAVE] = '`',
+	[KEY_COMMA] = ',',
+	[KEY_DOT] = '.',
+	[KEY_SLASH] = '/',
+	[KEY_ESC] = RENDERKEY_ESC,
+	[KEY_F1] = RENDERKEY_F1,
+	[KEY_F2] = RENDERKEY_F2,
+	[KEY_F3] = RENDERKEY_F3,
+	[KEY_F4] = RENDERKEY_F4,
+	[KEY_F5] = RENDERKEY_F5,
+	[KEY_F6] = RENDERKEY_F6,
+	[KEY_F7] = RENDERKEY_F7,
+	[KEY_F8] = RENDERKEY_F8,
+	[KEY_F9] = RENDERKEY_F9,
+	[KEY_F10] = RENDERKEY_F10,
+	[KEY_F11] = RENDERKEY_F11,
+	[KEY_F12] = RENDERKEY_F12,
+	[KEY_LEFTCTRL] = RENDERKEY_LCTRL,
+	[KEY_LEFTSHIFT] = RENDERKEY_LSHIFT,
+	[KEY_LEFTALT] = RENDERKEY_LALT,
+	[KEY_RIGHTCTRL] = RENDERKEY_RCTRL,
+	[KEY_RIGHTSHIFT] = RENDERKEY_RSHIFT,
+	[KEY_RIGHTALT] = RENDERKEY_RALT,
+	[KEY_DELETE] = RENDERKEY_DEL,
+	[KEY_LEFT] = RENDERKEY_LEFT,
+	[KEY_HOME] = RENDERKEY_HOME,
+	[KEY_END] = RENDERKEY_END,
+	[KEY_UP] = RENDERKEY_UP,
+	[KEY_DOWN] = RENDERKEY_DOWN,
+	[KEY_PAGEUP] = RENDERKEY_PAGEUP,
+	[KEY_PAGEDOWN] = RENDERKEY_PAGEDOWN,
+	[KEY_RIGHT] = RENDERKEY_RIGHT,
+	[KEY_KPSLASH] = 0x80,
+	[KEY_KPASTERISK] = 0x7C,
+	[KEY_KPMINUS] = 0x7B,
+	[KEY_KPPLUS] = 0x79,
+	[KEY_KPENTER] = 0x19,
+	[KEY_KP1] = 0x69,
+	[KEY_KP2] = 0x72,
+	[KEY_KP3] = 0x7A,
+	[KEY_KP4] = 0x6B,
+	[KEY_KP5] = 0x73,
+	[KEY_KP6] = 0x74,
+	[KEY_KP7] = 0x6C,
+	[KEY_KP8] = 0x75,
+	[KEY_KP9] = 0x7D,
+	[KEY_KP0] = 0x70,
+	[KEY_KPDOT] = 0x71,
+};
+
+static drop_handler drag_drop_handler;
+void render_set_drag_drop_handler(drop_handler handler)
+{
+	drag_drop_handler = handler;
+}
+
+/*static event_handler custom_event_handler;
+void render_set_event_handler(event_handler handler)
+{
+	custom_event_handler = handler;
+}*/
+
+char* render_joystick_type_id(int index)
+{
+	return "";
+	/*SDL_Joystick *stick = render_get_joystick(index);
+	if (!stick) {
+		return NULL;
+	}
+	char *guid_string = malloc(33);
+	SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(stick), guid_string, 33);
+	return guid_string;*/
+}
+
+static uint32_t overscan_top[NUM_VID_STD] = {2, 21};
+static uint32_t overscan_bot[NUM_VID_STD] = {1, 17};
+static uint32_t overscan_left[NUM_VID_STD] = {13, 13};
+static uint32_t overscan_right[NUM_VID_STD] = {14, 14};
+static vid_std video_standard = VID_NTSC;
+
+typedef enum {
+	DEV_NONE,
+	DEV_KEYBOARD,
+	DEV_MOUSE,
+	DEV_GAMEPAD
+} device_type;
+
+static int32_t mouse_x, mouse_y, mouse_accum_x, mouse_accum_y;
+static int32_t handle_event(device_type dtype, int device_index, struct input_event *event)
+{
+	switch (event->type) {
+	case EV_KEY:
+		//code is key, value is 1 for keydown, 0 for keyup
+		if (dtype == DEV_KEYBOARD && event->code < 128) {
+			//keyboard key that we might have a mapping for
+			if (event->value) {
+				handle_keydown(sym_map[event->code], scancode_map[event->code]);
+			} else {
+				handle_keyup(sym_map[event->code], scancode_map[event->code]);
+			}
+		} else if (dtype == DEV_MOUSE && event->code >= BTN_MOUSE && event->code < BTN_JOYSTICK) {
+			//mosue button
+			if (event->value) {
+				handle_mousedown(device_index, event->code - BTN_LEFT);
+			} else {
+				handle_mouseup(device_index, event->code - BTN_LEFT);
+			}
+		} else if (dtype == DEV_GAMEPAD && event->code >= BTN_GAMEPAD && event->code < BTN_DIGI) {
+			//gamepad button
+			if (event->value) {
+				handle_joydown(device_index, event->code - BTN_SOUTH);
+			} else {
+				handle_joyup(device_index, event->code - BTN_SOUTH);
+			}
+		}
+		break;
+	case EV_REL:
+		if (dtype == DEV_MOUSE) {
+			switch(event->code)
+			{
+			case REL_X:
+				mouse_accum_x += event->value;
+				break;
+			case REL_Y:
+				mouse_accum_y += event->value;
+				break;
+			}
+		}
+		break;
+	case EV_ABS:
+		//TODO: Handle joystick axis/hat motion, absolute mouse movement
+		break;
+	case EV_SYN:
+		if (dtype == DEV_MOUSE && (mouse_accum_x || mouse_accum_y)) {
+			mouse_x += mouse_accum_x;
+			mouse_y += mouse_accum_y;
+			if (mouse_x < 0) {
+				mouse_x = 0;
+			} else if (mouse_x >= main_width) {
+				mouse_x = main_width - 1;
+			}
+			if (mouse_y < 0) {
+				mouse_y = 0;
+			} else if (mouse_y >= main_height) {
+				mouse_y = main_height - 1;
+			}
+			handle_mouse_moved(device_index, mouse_x, mouse_y, mouse_accum_x, mouse_accum_y);
+			mouse_accum_x = mouse_accum_y = 0;
+		}
+		break;
+	/*
+	case SDL_JOYHATMOTION:
+		handle_joy_dpad(find_joystick_index(event->jhat.which), event->jhat.hat, event->jhat.value);
+		break;
+	case SDL_JOYAXISMOTION:
+		handle_joy_axis(find_joystick_index(event->jaxis.which), event->jaxis.axis, event->jaxis.value);
+		break;*/
+	}
+	return 0;
+}
+
+#define MAX_DEVICES 16
+static int device_fds[MAX_DEVICES];
+static device_type device_types[MAX_DEVICES];
+static int cur_devices;
+
+static void drain_events()
+{
+	struct input_event events[64];
+	int index_by_type[3] = {0,0,0};
+	for (int i = 0; i < cur_devices; i++)
+	{
+		int bytes = sizeof(events);
+		int device_index = index_by_type[device_types[i]-1]++;
+		while (bytes == sizeof(events))
+		{
+			bytes = read(device_fds[i], events, sizeof(events));
+			if (bytes > 0) {
+				int num_events = bytes / sizeof(events[0]);
+				for (int j = 0; j < num_events; j++)
+				{
+					handle_event(device_types[i], device_index, events + j);
+				}
+			} else if (bytes < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
+				perror("Failed to read evdev events");
+			}
+		}
+	}
+}
+
+static char *vid_std_names[NUM_VID_STD] = {"ntsc", "pal"};
+
+static void init_audio()
+{
+	int res = snd_pcm_open(&audio_handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
+	if (res < 0) {
+		fatal_error("Failed to open ALSA device: %s\n", snd_strerror(res));
+	}
+	
+	snd_pcm_hw_params_t *params;
+	snd_pcm_hw_params_alloca(&params);
+	res = snd_pcm_hw_params_any(audio_handle, params);
+	if (res < 0) {
+		fatal_error("No playback configurations available: %s\n", snd_strerror(res));
+	}
+	res = snd_pcm_hw_params_set_access(audio_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
+	if (res < 0) {
+		fatal_error("Failed to set access type: %s\n", snd_strerror(res));
+	}
+	res = snd_pcm_hw_params_set_format(audio_handle, params, SND_PCM_FORMAT_S16_LE);
+	if (res < 0) {
+		//failed to set, signed 16-bit integer, try floating point
+		res = snd_pcm_hw_params_set_format(audio_handle, params, SND_PCM_FORMAT_FLOAT_LE);
+		if (res < 0) {
+			fatal_error("Failed to set an acceptable format: %s\n", snd_strerror(res));
+		}
+		mix = mix_f32;
+	} else {
+		mix = mix_s16;
+	}
+
+    char * rate_str = tern_find_path(config, "audio\0rate\0", TVAL_PTR).ptrval;
+   	sample_rate = rate_str ? atoi(rate_str) : 0;
+   	if (!sample_rate) {
+   		sample_rate = 48000;
+   	}
+    snd_pcm_hw_params_set_rate_near(audio_handle, params, &sample_rate, NULL);
+	output_channels = 2;
+	snd_pcm_hw_params_set_channels_near(audio_handle, params, &output_channels);
+
+    char * samples_str = tern_find_path(config, "audio\0buffer\0", TVAL_PTR).ptrval;
+   	buffer_samples = samples_str ? atoi(samples_str) : 0;
+   	if (!buffer_samples) {
+   		buffer_samples = 512;
+   	}
+	snd_pcm_hw_params_set_period_size_near(audio_handle, params, &buffer_samples, NULL);
+	
+	int dir = 1;
+	unsigned int periods = 2;
+	snd_pcm_hw_params_set_periods_near(audio_handle, params, &periods, &dir);
+
+	res = snd_pcm_hw_params(audio_handle, params);
+	if (res < 0) {
+		fatal_error("Failed to set ALSA hardware params: %s\n", snd_strerror(res));
+	}
+	
+	printf("Initialized audio at frequency %d with a %d sample buffer, ", (int)sample_rate, (int)buffer_samples);
+	if (mix == mix_s16) {
+		puts("signed 16-bit int format");
+	} else {
+		puts("32-bit float format");
+	}
+}
+
+int fbfd;
+uint32_t *framebuffer;
+uint32_t fb_stride;
+#ifndef DISABLE_OPENGL
+EGLDisplay egl_display;
+EGLSurface main_surface;
+uint8_t egl_setup(void)
+{
+	//Mesa wants the fbdev file descriptor as the display
+	egl_display = eglGetDisplay((EGLNativeDisplayType)fbfd);
+	if (egl_display == EGL_NO_DISPLAY) {
+		//Mali (and possibly others) seems to just want EGL_DEFAULT_DISPLAY
+		egl_display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+		if (egl_display == EGL_NO_DISPLAY) {
+			warning("eglGetDisplay failed with error %X\n", eglGetError());
+			return 0;
+		}
+	}
+	EGLint major, minor;
+	if (!eglInitialize(egl_display, &major, &minor)) {
+		warning("eglInitialize failed with error %X\n", eglGetError());
+		return 0;
+	}
+	printf("EGL version %d.%d\n", major, minor);
+	EGLint num_configs;
+	EGLConfig config;
+	EGLint const config_attribs[] = {
+		EGL_RED_SIZE, 5,
+		EGL_GREEN_SIZE, 5,
+		EGL_BLUE_SIZE, 5,
+		EGL_CONFORMANT, EGL_OPENGL_ES2_BIT,
+		EGL_NONE
+	};
+	if (!eglChooseConfig(egl_display, config_attribs, &config, 1, &num_configs)) {
+		num_configs = 0;
+		warning("eglChooseConfig failed with error %X\n", eglGetError());
+	}
+	if (!num_configs) {
+		warning("Failed to choose an EGL config\n");
+		goto error;
+	}
+	EGLint const context_attribs[] = {
+#ifdef EGL_CONTEXT_MAJOR_VERSION
+		EGL_CONTEXT_MAJOR_VERSION, 2,
+#endif
+		EGL_NONE
+	};
+	main_context = eglCreateContext(egl_display, config, EGL_NO_CONTEXT, context_attribs);
+	if (main_context == EGL_NO_CONTEXT) {
+		warning("Failed to create EGL context %X\n", eglGetError());
+		goto error;
+	}
+#ifdef USE_MALI
+	struct mali_native_window native_window = {
+		.width = main_width,
+		.height = main_height
+	};
+	main_surface = eglCreateWindowSurface(egl_display, config, &native_window, NULL);
+#else
+	main_surface = eglCreateWindowSurface(egl_display, config, (EGLNativeWindowType)NULL, NULL);
+#endif
+	if (main_surface == EGL_NO_SURFACE) {
+		warning("Failed to create EGL surface %X\n", eglGetError());
+		goto post_context_error;
+	}
+	if (eglMakeCurrent(egl_display, main_surface, main_surface, main_context)) {
+		return 1;
+	}
+	eglDestroySurface(egl_display, main_surface);
+post_context_error:
+	eglDestroyContext(egl_display, main_context);
+error:
+	eglTerminate(egl_display);
+	return 0;
+}
+#endif
+static pthread_mutex_t buffer_lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t buffer_cond = PTHREAD_COND_INITIALIZER;
+static uint8_t buffer_ready;
+static uint32_t *copy_buffer;
+static uint32_t last_width, last_height;
+static uint32_t max_multiple;
+static void do_buffer_copy(void)
+{
+	uint32_t width_multiple = main_width / last_width;
+	uint32_t height_multiple = main_height / last_height;
+	uint32_t multiple = width_multiple < height_multiple ? width_multiple : height_multiple;
+	if (max_multiple && multiple > max_multiple) {
+		multiple = max_multiple;
+	}
+	uint32_t *cur_line = framebuffer + (main_width - last_width * multiple)/2;
+	cur_line += fb_stride * (main_height - last_height * multiple) / (2 * sizeof(uint32_t));
+	uint32_t *src_line = copy_buffer;
+	for (uint32_t y = 0; y < last_height; y++)
+	{
+		for (uint32_t i = 0; i < multiple; i++)
+		{
+			uint32_t *cur = cur_line;
+			uint32_t *src = src_line;
+			for (uint32_t x = 0; x < last_width	; x++)
+			{
+				uint32_t pixel = *(src++);
+				for (uint32_t j = 0; j < multiple; j++)
+				{
+					*(cur++) = pixel;
+				}
+			}
+			
+			cur_line += fb_stride / sizeof(uint32_t);
+		}
+		src_line += LINEBUF_SIZE;
+	}
+}
+static void *buffer_copy(void *data)
+{
+	pthread_mutex_lock(&buffer_lock);
+	for(;;)
+	{
+		while (!buffer_ready)
+		{
+			pthread_cond_wait(&buffer_cond, &buffer_lock);
+		}
+		buffer_ready = 0;
+		do_buffer_copy();
+	}
+	return 0;
+}
+
+static pthread_t buffer_copy_handle;
+static uint8_t copy_use_thread;
+void window_setup(void)
+{
+	fbfd = open("/dev/fb0", O_RDWR);
+	struct fb_fix_screeninfo fixInfo;
+	struct fb_var_screeninfo varInfo;
+	ioctl(fbfd, FBIOGET_FSCREENINFO, &fixInfo);
+	ioctl(fbfd, FBIOGET_VSCREENINFO, &varInfo);
+	printf("Resolution: %d x %d\n", varInfo.xres, varInfo.yres);
+	printf("Framebuffer size: %d, line stride: %d\n", fixInfo.smem_len, fixInfo.line_length);
+	main_width = varInfo.xres;
+	main_height = varInfo.yres;
+	fb_stride = fixInfo.line_length;
+	tern_val def = {.ptrval = "audio"};
+	char *sync_src = tern_find_path_default(config, "system\0sync_source\0", def, TVAL_PTR).ptrval;
+		
+	const char *vsync;
+	def.ptrval = "off";
+	vsync = tern_find_path_default(config, "video\0vsync\0", def, TVAL_PTR).ptrval;
+	
+	
+	tern_node *video = tern_find_node(config, "video");
+	if (video)
+	{
+		for (int i = 0; i < NUM_VID_STD; i++)
+		{
+			tern_node *std_settings = tern_find_node(video, vid_std_names[i]);
+			if (std_settings) {
+				char *val = tern_find_path_default(std_settings, "overscan\0top\0", (tern_val){.ptrval = NULL}, TVAL_PTR).ptrval;
+				if (val) {
+					overscan_top[i] = atoi(val);
+				}
+				val = tern_find_path_default(std_settings, "overscan\0bottom\0", (tern_val){.ptrval = NULL}, TVAL_PTR).ptrval;
+				if (val) {
+					overscan_bot[i] = atoi(val);
+				}
+				val = tern_find_path_default(std_settings, "overscan\0left\0", (tern_val){.ptrval = NULL}, TVAL_PTR).ptrval;
+				if (val) {
+					overscan_left[i] = atoi(val);
+				}
+				val = tern_find_path_default(std_settings, "overscan\0right\0", (tern_val){.ptrval = NULL}, TVAL_PTR).ptrval;
+				if (val) {
+					overscan_right[i] = atoi(val);
+				}
+			}
+		}
+	}
+	render_gl = 0;
+#ifndef DISABLE_OPENGL
+	char *gl_enabled_str = tern_find_path_default(config, "video\0gl\0", def, TVAL_PTR).ptrval;
+	uint8_t gl_enabled = strcmp(gl_enabled_str, "off") != 0;
+	if (gl_enabled)
+	{
+		render_gl = egl_setup();
+		blue_shift = 16;
+		green_shift = 8;
+		red_shift = 0;
+	}
+	if (!render_gl) {
+#endif
+	framebuffer = mmap(NULL, fixInfo.smem_len, PROT_READ|PROT_WRITE, MAP_SHARED, fbfd, 0);
+	red_shift = varInfo.red.offset;
+	green_shift = varInfo.green.offset;
+	blue_shift = varInfo.blue.offset;
+	def.ptrval = "0";
+	max_multiple = atoi(tern_find_path_default(config, "video\0fbdev\0max_multiple\0", def, TVAL_PTR).ptrval);
+	def.ptrval = "true";
+	copy_use_thread = strcmp(tern_find_path_default(config, "video\0fbdev\0use_thread\0", def, TVAL_PTR).ptrval, "false");
+	if (copy_use_thread) {
+		pthread_create(&buffer_copy_handle, NULL, buffer_copy, NULL);
+	}
+#ifndef DISABLE_OPENGL
+	}
+#endif
+	
+	/*
+#ifndef DISABLE_OPENGL
+	char *gl_enabled_str = tern_find_path_default(config, "video\0gl\0", def, TVAL_PTR).ptrval;
+	uint8_t gl_enabled = strcmp(gl_enabled_str, "off") != 0;
+	if (gl_enabled)
+	{
+		flags |= SDL_WINDOW_OPENGL;
+		SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
+		SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
+		SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
+		SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
+		SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+#ifdef USE_GLES
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#endif
+	}
+#endif
+	main_window = SDL_CreateWindow(caption, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, main_width, main_height, flags);
+	if (!main_window) {
+		fatal_error("Unable to create SDL window: %s\n", SDL_GetError());
+	}
+#ifndef DISABLE_OPENGL
+	if (gl_enabled)
+	{
+		main_context = SDL_GL_CreateContext(main_window);
+#ifdef USE_GLES
+		int major_version;
+		if (SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &major_version) == 0 && major_version >= 2) {
+#else
+		GLenum res = glewInit();
+		if (res != GLEW_OK) {
+			warning("Initialization of GLEW failed with code %d\n", res);
+		}
+
+		if (res == GLEW_OK && GLEW_VERSION_2_0) {
+#endif
+			render_gl = 1;
+			SDL_GL_MakeCurrent(main_window, main_context);
+			if (!strcmp("tear", vsync)) {
+				if (SDL_GL_SetSwapInterval(-1) < 0) {
+					warning("late tear is not available (%s), using normal vsync\n", SDL_GetError());
+					vsync = "on";
+				} else {
+					vsync = NULL;
+				}
+			}
+			if (vsync) {
+				if (SDL_GL_SetSwapInterval(!strcmp("on", vsync)) < 0) {
+					warning("Failed to set vsync to %s: %s\n", vsync, SDL_GetError());
+				}
+			}
+		} else {
+			warning("OpenGL 2.0 is unavailable, falling back to SDL2 renderer\n");
+		}
+	}
+	if (!render_gl) {
+#endif
+		flags = SDL_RENDERER_ACCELERATED;
+		if (!strcmp("on", vsync) || !strcmp("tear", vsync)) {
+			flags |= SDL_RENDERER_PRESENTVSYNC;
+		}
+		main_renderer = SDL_CreateRenderer(main_window, -1, flags);
+
+		if (!main_renderer) {
+			fatal_error("unable to create SDL renderer: %s\n", SDL_GetError());
+		}
+		SDL_RendererInfo rinfo;
+		SDL_GetRendererInfo(main_renderer, &rinfo);
+		printf("SDL2 Render Driver: %s\n", rinfo.name);
+		main_clip.x = main_clip.y = 0;
+		main_clip.w = main_width;
+		main_clip.h = main_height;
+#ifndef DISABLE_OPENGL
+	}
+#endif
+
+	SDL_GetWindowSize(main_window, &main_width, &main_height);
+	printf("Window created with size: %d x %d\n", main_width, main_height);*/
+	update_aspect();
+	render_alloc_surfaces();
+	def.ptrval = "off";
+	scanlines = !strcmp(tern_find_path_default(config, "video\0scanlines\0", def, TVAL_PTR).ptrval, "on");
+}
+
+void restore_tty(void)
+{
+	ioctl(STDIN_FILENO, KDSETMODE, KD_TEXT);
+}
+
+void render_init(int width, int height, char * title, uint8_t fullscreen)
+{
+	if (height <= 0) {
+		float aspect = config_aspect() > 0.0f ? config_aspect() : 4.0f/3.0f;
+		height = ((float)width / aspect) + 0.5f;
+	}
+	printf("width: %d, height: %d\n", width, height);
+	windowed_width = width;
+	windowed_height = height;
+	
+	main_width = width;
+	main_height = height;
+	
+	caption = title;
+	
+	if (isatty(STDIN_FILENO)) {
+		ioctl(STDIN_FILENO, KDSETMODE, KD_GRAPHICS);
+		atexit(restore_tty);
+	}
+	
+	window_setup();
+	
+	init_audio();
+	
+	render_set_video_standard(VID_NTSC);
+	
+	DIR *d = opendir("/dev/input");
+	struct dirent* entry;
+	int joystick_counter = 0;
+	while ((entry = readdir(d)) && cur_devices < MAX_DEVICES)
+	{
+		if (!strncmp("event", entry->d_name, strlen("event"))) {
+			char *filename = alloc_concat("/dev/input/", entry->d_name);
+			int fd = open(filename, O_RDONLY);
+			if (fd == -1) {
+				int errnum = errno;
+				warning("Failed to open evdev device %s for reading: %s\n", filename, strerror(errnum));
+				free(filename);
+				continue;
+			}
+			
+			unsigned long bits;
+			if (-1 == ioctl(fd, EVIOCGBIT(0, sizeof(bits)), &bits)) {
+				int errnum = errno;
+				warning("Failed get capability bits from evdev device %s: %s\n", filename, strerror(errnum));
+				free(filename);
+				close(fd);
+				continue;
+			}
+			if (!(1 & bits >> EV_KEY)) {
+				//if it doesn't support key events we don't care about it
+				free(filename);
+				close(fd);
+				continue;
+			}
+			unsigned long button_bits[(BTN_THUMBR+8*sizeof(long))/(8*sizeof(long))];
+			int res = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(button_bits)), button_bits);
+			if (-1 == res) {
+				int errnum = errno;
+				warning("Failed get capability bits from evdev device %s: %s\n", filename, strerror(errnum));
+				free(filename);
+				close(fd);
+				continue;
+			}
+			int to_check[] = {KEY_ENTER, BTN_MOUSE, BTN_GAMEPAD};
+			device_type dtype = DEV_NONE;
+			for (int i = 0; i < 4; i++)
+			{
+				if (1 & button_bits[to_check[i]/(8*sizeof(button_bits[0]))] >> to_check[i]%(8*sizeof(button_bits[0]))) {
+					dtype = i + 1;
+				}
+			}
+			if (dtype == DEV_NONE) {
+				close(fd);
+			} else {
+				device_fds[cur_devices] = fd;
+				device_types[cur_devices] = dtype;
+				char name[1024];
+				char *names[] = {"Keyboard", "Mouse", "Gamepad"};
+				ioctl(fd, EVIOCGNAME(sizeof(name)), name);
+				printf("%s is a %s\n%s\n", filename, names[dtype - 1], name);
+				//set FD to non-blocking mode for event polling
+				fcntl(fd, F_SETFL, O_NONBLOCK);
+				if (dtype == DEV_GAMEPAD) {
+					handle_joy_added(joystick_counter++);
+				}
+				cur_devices++;
+			}
+			free(filename);
+		}
+	}
+
+	atexit(render_quit);
+}
+#include<unistd.h>
+static int in_toggle;
+static void update_source(audio_source *src, double rc, uint8_t sync_changed)
+{
+	double alpha = src->dt / (src->dt + rc);
+	int32_t lowpass_alpha = (int32_t)(((double)0x10000) * alpha);
+	src->lowpass_alpha = lowpass_alpha;
+}
+
+void render_config_updated(void)
+{
+	
+	free_surfaces();
+#ifndef DISABLE_OPENGL
+	if (render_gl) {
+		/*if (on_context_destroyed) {
+			on_context_destroyed();
+		}*/
+		gl_teardown();
+		//FIXME: EGL equivalent
+		//SDL_GL_DeleteContext(main_context);
+	} else {
+#endif
+#ifndef DISABLE_OPENGL
+	}
+#endif
+	//FIXME: EGL equivalent
+	//SDL_DestroyWindow(main_window);
+	drain_events();
+	
+	char *config_width = tern_find_path(config, "video\0width\0", TVAL_PTR).ptrval;
+	if (config_width) {
+		windowed_width = atoi(config_width);
+	}
+	char *config_height = tern_find_path(config, "video\0height\0", TVAL_PTR).ptrval;
+	if (config_height) {
+		windowed_height = atoi(config_height);
+	} else {
+		float aspect = config_aspect() > 0.0f ? config_aspect() : 4.0f/3.0f;
+		windowed_height = ((float)windowed_width / aspect) + 0.5f;
+	}
+	
+	window_setup();
+	update_aspect();
+#ifndef DISABLE_OPENGL
+	//need to check render_gl again after window_setup as render option could have changed
+	/*if (render_gl && on_context_created) {
+		on_context_created();
+	}*/
+#endif
+
+	render_close_audio();
+	quitting = 0;
+	init_audio();
+	render_set_video_standard(video_standard);
+	
+	double lowpass_cutoff = get_lowpass_cutoff(config);
+	double rc = (1.0 / lowpass_cutoff) / (2.0 * M_PI);
+	for (uint8_t i = 0; i < num_audio_sources; i++)
+	{
+		update_source(audio_sources[i], rc, 0);
+	}
+	for (uint8_t i = 0; i < num_inactive_audio_sources; i++)
+	{
+		update_source(inactive_audio_sources[i], rc, 0);
+	}
+	drain_events();
+}
+
+void render_set_video_standard(vid_std std)
+{
+	video_standard = std;
+}
+
+void render_update_caption(char *title)
+{
+	caption = title;
+	free(fps_caption);
+	fps_caption = NULL;
+}
+
+static char *screenshot_path;
+void render_save_screenshot(char *path)
+{
+	if (screenshot_path) {
+		free(screenshot_path);
+	}
+	screenshot_path = path;
+}
+
+uint8_t render_create_window(char *caption, uint32_t width, uint32_t height, window_close_handler close_handler)
+{
+	//not supported under fbdev
+	return 0;
+}
+
+void render_destroy_window(uint8_t which)
+{
+	//not supported under fbdev
+}
+
+uint32_t *locked_pixels;
+uint32_t locked_pitch;
+uint32_t texture_off;
+uint32_t *render_get_framebuffer(uint8_t which, int *pitch)
+{
+	if (max_multiple == 1 && !render_gl) {
+		*pitch = fb_stride;
+		return framebuffer;
+	}
+	*pitch = LINEBUF_SIZE * sizeof(uint32_t);
+	return texture_buf + texture_off;
+	/*
+#ifndef DISABLE_OPENGL
+	if (render_gl && which <= FRAMEBUFFER_EVEN) {
+		*pitch = LINEBUF_SIZE * sizeof(uint32_t);
+		return texture_buf;
+	} else {
+#endif
+		if (which >= num_textures) {
+			warning("Request for invalid framebuffer number %d\n", which);
+			return NULL;
+		}
+		void *pixels;
+		if (SDL_LockTexture(sdl_textures[which], NULL, &pixels, pitch) < 0) {
+			warning("Failed to lock texture: %s\n", SDL_GetError());
+			return NULL;
+		}
+		static uint8_t last;
+		if (which <= FRAMEBUFFER_EVEN) {
+			locked_pixels = pixels;
+			if (which == FRAMEBUFFER_EVEN) {
+				pixels += *pitch;
+			}
+			locked_pitch = *pitch;
+			if (which != last) {
+				*pitch *= 2;
+			}
+			last = which;
+		}
+		return pixels;
+#ifndef DISABLE_OPENGL
+	}
+#endif*/
+}
+
+uint8_t events_processed;
+#ifdef __ANDROID__
+#define FPS_INTERVAL 10000
+#else
+#define FPS_INTERVAL 1000
+#endif
+
+static uint8_t interlaced;
+void render_update_display();
+void render_framebuffer_updated(uint8_t which, int width)
+{
+	uint32_t height = which <= FRAMEBUFFER_EVEN 
+		? (video_standard == VID_NTSC ? 243 : 294) - (overscan_top[video_standard] + overscan_bot[video_standard])
+		: 240;
+	width -= overscan_left[video_standard] + overscan_right[video_standard];
+#ifndef DISABLE_OPENGL
+	if (render_gl && which <= FRAMEBUFFER_EVEN) {
+		last_width = width;
+		glBindTexture(GL_TEXTURE_2D, textures[which]);
+		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, LINEBUF_SIZE, height, SRC_FORMAT, GL_UNSIGNED_BYTE, texture_buf + overscan_left[video_standard] + LINEBUF_SIZE * overscan_top[video_standard]);
+		render_update_display();
+		last_height = height;
+	} else {
+#endif
+	if (max_multiple != 1) {
+		if (copy_use_thread) {
+			pthread_mutex_lock(&buffer_lock);
+				buffer_ready = 1;
+				last_width = width;
+				last_height = height;
+				copy_buffer = texture_buf + texture_off + overscan_left[video_standard] + LINEBUF_SIZE * overscan_top[video_standard];
+				texture_off = texture_off ? 0 : LINEBUF_SIZE * 512;
+				pthread_cond_signal(&buffer_cond);
+			pthread_mutex_unlock(&buffer_lock);
+		} else {
+			last_width = width;
+			last_height = height;
+			copy_buffer = texture_buf + texture_off + overscan_left[video_standard] + LINEBUF_SIZE * overscan_top[video_standard];
+			do_buffer_copy();
+		}
+	}
+	if (!events_processed) {
+		process_events();
+	}
+	events_processed = 0;
+#ifndef DISABLE_OPENGL
+	}
+#endif
+	/*
+	FILE *screenshot_file = NULL;
+	uint32_t shot_height, shot_width;
+	char *ext;
+	if (screenshot_path && which == FRAMEBUFFER_ODD) {
+		screenshot_file = fopen(screenshot_path, "wb");
+		if (screenshot_file) {
+#ifndef DISABLE_ZLIB
+			ext = path_extension(screenshot_path);
+#endif
+			info_message("Saving screenshot to %s\n", screenshot_path);
+		} else {
+			warning("Failed to open screenshot file %s for writing\n", screenshot_path);
+		}
+		free(screenshot_path);
+		screenshot_path = NULL;
+		shot_height = video_standard == VID_NTSC ? 243 : 294;
+		shot_width = width;
+	}
+	interlaced = last != which;
+	width -= overscan_left[video_standard] + overscan_right[video_standard];
+#ifndef DISABLE_OPENGL
+	if (render_gl && which <= FRAMEBUFFER_EVEN) {
+		SDL_GL_MakeCurrent(main_window, main_context);
+		glBindTexture(GL_TEXTURE_2D, textures[which]);
+		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, LINEBUF_SIZE, height, SRC_FORMAT, GL_UNSIGNED_BYTE, texture_buf + overscan_left[video_standard] + LINEBUF_SIZE * overscan_top[video_standard]);
+		
+		if (screenshot_file) {
+			//properly supporting interlaced modes here is non-trivial, so only save the odd field for now
+#ifndef DISABLE_ZLIB
+			if (!strcasecmp(ext, "png")) {
+				free(ext);
+				save_png(screenshot_file, texture_buf, shot_width, shot_height, LINEBUF_SIZE*sizeof(uint32_t));
+			} else {
+				free(ext);
+#endif
+				save_ppm(screenshot_file, texture_buf, shot_width, shot_height, LINEBUF_SIZE*sizeof(uint32_t));
+#ifndef DISABLE_ZLIB
+			}
+#endif
+		}
+	} else {
+#endif
+		if (which <= FRAMEBUFFER_EVEN && last != which) {
+			uint8_t *cur_dst = (uint8_t *)locked_pixels;
+			uint8_t *cur_saved = (uint8_t *)texture_buf;
+			uint32_t dst_off = which == FRAMEBUFFER_EVEN ? 0 : locked_pitch;
+			uint32_t src_off = which == FRAMEBUFFER_EVEN ? locked_pitch : 0;
+			for (int i = 0; i < height; ++i)
+			{
+				//copy saved line from other field
+				memcpy(cur_dst + dst_off, cur_saved, locked_pitch);
+				//save line from this field to buffer for next frame
+				memcpy(cur_saved, cur_dst + src_off, locked_pitch);
+				cur_dst += locked_pitch * 2;
+				cur_saved += locked_pitch;
+			}
+			height = 480;
+		}
+		if (screenshot_file) {
+			uint32_t shot_pitch = locked_pitch;
+			if (which == FRAMEBUFFER_EVEN) {
+				shot_height *= 2;
+			} else {
+				shot_pitch *= 2;
+			}
+#ifndef DISABLE_ZLIB
+			if (!strcasecmp(ext, "png")) {
+				free(ext);
+				save_png(screenshot_file, locked_pixels, shot_width, shot_height, shot_pitch);
+			} else {
+				free(ext);
+#endif
+				save_ppm(screenshot_file, locked_pixels, shot_width, shot_height, shot_pitch);
+#ifndef DISABLE_ZLIB
+			}
+#endif
+		}
+		SDL_UnlockTexture(sdl_textures[which]);
+#ifndef DISABLE_OPENGL
+	}
+#endif
+	last_height = height;
+	if (which <= FRAMEBUFFER_EVEN) {
+		render_update_display();
+	} else {
+		SDL_RenderCopy(extra_renderers[which - FRAMEBUFFER_USER_START], sdl_textures[which], NULL, NULL);
+		SDL_RenderPresent(extra_renderers[which - FRAMEBUFFER_USER_START]);
+	}
+	if (screenshot_file) {
+		fclose(screenshot_file);
+	}
+	if (which <= FRAMEBUFFER_EVEN) {
+		last = which;
+		static uint32_t frame_counter, start;
+		frame_counter++;
+		last_frame= SDL_GetTicks();
+		if ((last_frame - start) > FPS_INTERVAL) {
+			if (start && (last_frame-start)) {
+	#ifdef __ANDROID__
+				info_message("%s - %.1f fps", caption, ((float)frame_counter) / (((float)(last_frame-start)) / 1000.0));
+	#else
+				if (!fps_caption) {
+					fps_caption = malloc(strlen(caption) + strlen(" - 100000000.1 fps") + 1);
+				}
+				sprintf(fps_caption, "%s - %.1f fps", caption, ((float)frame_counter) / (((float)(last_frame-start)) / 1000.0));
+				SDL_SetWindowTitle(main_window, fps_caption);
+	#endif
+			}
+			start = last_frame;
+			frame_counter = 0;
+		}
+	}
+	if (!sync_to_audio) {
+		int32_t local_cur_min, local_min_remaining;
+		SDL_LockAudio();
+			if (last_buffered > NO_LAST_BUFFERED) {
+				average_change *= 0.9f;
+				average_change += (cur_min_buffered - last_buffered) * 0.1f;
+			}
+			local_cur_min = cur_min_buffered;
+			local_min_remaining = min_remaining_buffer;
+			last_buffered = cur_min_buffered;
+		SDL_UnlockAudio();
+		float frames_to_problem;
+		if (average_change < 0) {
+			frames_to_problem = (float)local_cur_min / -average_change;
+		} else {
+			frames_to_problem = (float)local_min_remaining / average_change;
+		}
+		float adjust_ratio = 0.0f;
+		if (
+			frames_to_problem < BUFFER_FRAMES_THRESHOLD
+			|| (average_change < 0 && local_cur_min < 3*min_buffered / 4)
+			|| (average_change >0 && local_cur_min > 5 * min_buffered / 4)
+			|| cur_min_buffered < 0
+		) {
+			
+			if (cur_min_buffered < 0) {
+				adjust_ratio = max_adjust;
+				SDL_PauseAudio(1);
+				last_buffered = NO_LAST_BUFFERED;
+				cur_min_buffered = 0;
+			} else {
+				adjust_ratio = -1.0 * average_change / ((float)sample_rate / (float)source_hz);
+				adjust_ratio /= 2.5 * source_hz;
+				if (fabsf(adjust_ratio) > max_adjust) {
+					adjust_ratio = adjust_ratio > 0 ? max_adjust : -max_adjust;
+				}
+			}
+		} else if (local_cur_min < min_buffered / 2) {
+			adjust_ratio = max_adjust;
+		}
+		if (adjust_ratio != 0.0f) {
+			average_change = 0;
+			for (uint8_t i = 0; i < num_audio_sources; i++)
+			{
+				audio_sources[i]->buffer_inc = ((double)audio_sources[i]->buffer_inc) + ((double)audio_sources[i]->buffer_inc) * adjust_ratio + 0.5;
+			}
+		}
+		while (source_frame_count > 0)
+		{
+			render_update_display();
+			source_frame_count--;
+		}
+		source_frame++;
+		if (source_frame >= source_hz) {
+			source_frame = 0;
+		}
+		source_frame_count = frame_repeat[source_frame];
+	}*/
+}
+/*
+static ui_render_fun render_ui;
+void render_set_ui_render_fun(ui_render_fun fun)
+{
+	render_ui = fun;
+}
+*/
+void render_update_display()
+{
+#ifndef DISABLE_OPENGL
+	if (render_gl) {
+		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT);
+
+		glUseProgram(program);
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, textures[0]);
+		glUniform1i(un_textures[0], 0);
+
+		glActiveTexture(GL_TEXTURE1);
+		glBindTexture(GL_TEXTURE_2D, textures[interlaced ? 1 : scanlines ? 2 : 0]);
+		glUniform1i(un_textures[1], 1);
+
+		glUniform1f(un_width, render_emulated_width());
+		glUniform1f(un_height, last_height);
+
+		glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
+		glVertexAttribPointer(at_pos, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat[2]), (void *)0);
+		glEnableVertexAttribArray(at_pos);
+
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
+		glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_SHORT, (void *)0);
+
+		glDisableVertexAttribArray(at_pos);
+		
+		/*if (render_ui) {
+			render_ui();
+		}*/
+
+		eglSwapBuffers(egl_display, main_surface);
+	}
+#endif
+	if (!events_processed) {
+		process_events();
+	}
+	events_processed = 0;
+}
+
+uint32_t render_emulated_width()
+{
+	return last_width - overscan_left[video_standard] - overscan_right[video_standard];
+}
+
+uint32_t render_emulated_height()
+{
+	return (video_standard == VID_NTSC ? 243 : 294) - overscan_top[video_standard] - overscan_bot[video_standard];
+}
+
+uint32_t render_overscan_left()
+{
+	return overscan_left[video_standard];
+}
+
+uint32_t render_overscan_top()
+{
+	return overscan_top[video_standard];
+}
+
+void render_wait_quit(vdp_context * context)
+{
+	for(;;)
+	{
+		drain_events();
+		sleep(1);
+	}
+}
+
+int render_lookup_button(char *name)
+{
+	static tern_node *button_lookup;
+	if (!button_lookup) {
+		//xbox/sdl style names
+		button_lookup = tern_insert_int(button_lookup, "a", BTN_SOUTH);
+		button_lookup = tern_insert_int(button_lookup, "b", BTN_EAST);
+		button_lookup = tern_insert_int(button_lookup, "x", BTN_WEST);
+		button_lookup = tern_insert_int(button_lookup, "y", BTN_NORTH);
+		button_lookup = tern_insert_int(button_lookup, "back", BTN_SELECT);
+		button_lookup = tern_insert_int(button_lookup, "start", BTN_START);
+		button_lookup = tern_insert_int(button_lookup, "guid", BTN_MODE);
+		button_lookup = tern_insert_int(button_lookup, "leftshoulder", BTN_TL);
+		button_lookup = tern_insert_int(button_lookup, "rightshoulder", BTN_TR);
+		button_lookup = tern_insert_int(button_lookup, "leftstick", BTN_THUMBL);
+		button_lookup = tern_insert_int(button_lookup, "rightstick", BTN_THUMBR);
+		//alternative Playstation-style names
+		button_lookup = tern_insert_int(button_lookup, "cross", BTN_SOUTH);
+		button_lookup = tern_insert_int(button_lookup, "circle", BTN_EAST);
+		button_lookup = tern_insert_int(button_lookup, "square", BTN_WEST);
+		button_lookup = tern_insert_int(button_lookup, "triangle", BTN_NORTH);
+		button_lookup = tern_insert_int(button_lookup, "share", BTN_SELECT);
+		button_lookup = tern_insert_int(button_lookup, "select", BTN_SELECT);
+		button_lookup = tern_insert_int(button_lookup, "options", BTN_START);
+		button_lookup = tern_insert_int(button_lookup, "l1", BTN_TL);
+		button_lookup = tern_insert_int(button_lookup, "r1", BTN_TR);
+		button_lookup = tern_insert_int(button_lookup, "l3", BTN_THUMBL);
+		button_lookup = tern_insert_int(button_lookup, "r3", BTN_THUMBR);
+	}
+	return (int)tern_find_int(button_lookup, name, KEY_CNT);
+}
+
+int render_lookup_axis(char *name)
+{
+	static tern_node *axis_lookup;
+	if (!axis_lookup) {
+		//xbox/sdl style names
+		axis_lookup = tern_insert_int(axis_lookup, "leftx", ABS_X);
+		axis_lookup = tern_insert_int(axis_lookup, "lefty", ABS_Y);
+		axis_lookup = tern_insert_int(axis_lookup, "lefttrigger", ABS_Z);
+		axis_lookup = tern_insert_int(axis_lookup, "rightx", ABS_RX);
+		axis_lookup = tern_insert_int(axis_lookup, "righty", ABS_RY);
+		axis_lookup = tern_insert_int(axis_lookup, "righttrigger", ABS_RZ);
+		//alternative Playstation-style names
+		axis_lookup = tern_insert_int(axis_lookup, "l2", ABS_Z);
+		axis_lookup = tern_insert_int(axis_lookup, "r2", ABS_RZ);
+	}
+	return (int)tern_find_int(axis_lookup, name, ABS_CNT);
+}
+
+int32_t render_translate_input_name(int32_t controller, char *name, uint8_t is_axis)
+{
+	tern_node *button_lookup, *axis_lookup;
+	if (is_axis) {
+		int axis = render_lookup_axis(name);
+		if (axis == ABS_CNT) {
+			return RENDER_INVALID_NAME;
+		}
+		return RENDER_AXIS_BIT | axis;
+	} else {
+		int button = render_lookup_button(name);
+		if (button != KEY_CNT) {
+			return button;
+		}
+		if (!strcmp("dpup", name)) {
+			return RENDER_DPAD_BIT | 1;
+		}
+		if (!strcmp("dpdown", name)) {
+			return RENDER_DPAD_BIT | 4;
+		}
+		if (!strcmp("dpdleft", name)) {
+			return RENDER_DPAD_BIT | 8;
+		}
+		if (!strcmp("dpright", name)) {
+			return RENDER_DPAD_BIT | 2;
+		}
+		return RENDER_INVALID_NAME;
+	}
+}
+
+int32_t render_dpad_part(int32_t input)
+{
+	return input >> 4 & 0xFFFFFF;
+}
+
+uint8_t render_direction_part(int32_t input)
+{
+	return input & 0xF;
+}
+
+int32_t render_axis_part(int32_t input)
+{
+	return input & 0xFFFFFFF;
+}
+
+void process_events()
+{
+	if (events_processed > MAX_EVENT_POLL_PER_FRAME) {
+		return;
+	}
+	drain_events();
+	events_processed++;
+}
+
+#define TOGGLE_MIN_DELAY 250
+void render_toggle_fullscreen()
+{
+	//always fullscreen in fbdev
+}
+
+uint32_t render_audio_buffer()
+{
+	return buffer_samples;
+}
+
+uint32_t render_sample_rate()
+{
+	return sample_rate;
+}
+
+void render_errorbox(char *title, char *message)
+{
+	
+}
+
+void render_warnbox(char *title, char *message)
+{
+	
+}
+
+void render_infobox(char *title, char *message)
+{
+	
+}
+
+uint8_t render_has_gl(void)
+{
+	return render_gl;
+}
+
+uint8_t render_get_active_framebuffer(void)
+{
+	return FRAMEBUFFER_ODD;
+}
diff --git a/special_keys_evdev.h b/special_keys_evdev.h
new file mode 100644
index 0000000..196809f
--- /dev/null
+++ b/special_keys_evdev.h
@@ -0,0 +1,59 @@
+#ifndef SPECIAL_KEYS_EVDEV_H_
+#define SPECIAL_KEYS_EVDEV_H_
+
+enum {
+	RENDERKEY_DOWN = 128,
+	RENDERKEY_UP,
+	RENDERKEY_LEFT,
+	RENDERKEY_RIGHT,
+	RENDERKEY_ESC,
+	RENDERKEY_DEL,  
+	RENDERKEY_LSHIFT, 
+	RENDERKEY_RSHIFT,
+	RENDERKEY_LCTRL,
+	RENDERKEY_RCTRL,
+	RENDERKEY_LALT,
+	RENDERKEY_RALT,
+	RENDERKEY_HOME,
+	RENDERKEY_END,
+	RENDERKEY_PAGEUP,
+	RENDERKEY_PAGEDOWN,
+	RENDERKEY_F1,
+	RENDERKEY_F2,
+	RENDERKEY_F3,
+	RENDERKEY_F4,
+	RENDERKEY_F5,
+	RENDERKEY_F6,
+	RENDERKEY_F7,
+	RENDERKEY_F8,
+	RENDERKEY_F9,
+	RENDERKEY_F10,
+	RENDERKEY_F11,
+	RENDERKEY_F12,
+	RENDERKEY_SELECT,
+	RENDERKEY_PLAY,
+	RENDERKEY_SEARCH,
+	RENDERKEY_BACK,
+	RENDERKEY_NP0,
+	RENDERKEY_NP1,
+	RENDERKEY_NP2,
+	RENDERKEY_NP3,
+	RENDERKEY_NP4,
+	RENDERKEY_NP5,
+	RENDERKEY_NP6,
+	RENDERKEY_NP7,
+	RENDERKEY_NP8,
+	RENDERKEY_NP9,
+	RENDERKEY_NP_DIV,
+	RENDERKEY_NP_MUL,
+	RENDERKEY_NP_MIN,
+	RENDERKEY_NP_PLUS,
+	RENDERKEY_NP_ENTER,
+	RENDERKEY_NP_STOP,
+	RENDER_DPAD_UP,
+	RENDER_DPAD_DOWN,
+	RENDER_DPAD_LEFT,
+	RENDER_DPAD_RIGHT
+};
+
+#endif //SPECIAL_KEYS_EVDEV_H_