diff --git a/src/gb/core.c b/src/gb/core.c
index e249a73cc..e9a2ac08c 100644
--- a/src/gb/core.c
+++ b/src/gb/core.c
@@ -34,7 +34,6 @@ static bool _GBCoreInit(struct mCore* core) {
 	LR35902Init(cpu);
 
 	GBVideoSoftwareRendererCreate(&gbcore->renderer);
-	GBVideoAssociateRenderer(&gb->video, &gbcore->renderer.d);
 
 	gb->keySource = &gbcore->keys;
 
@@ -110,6 +109,9 @@ static void _GBCoreUnloadROM(struct mCore* core) {
 }
 
 static void _GBCoreReset(struct mCore* core) {
+	struct GBCore* gbcore = (struct GBCore*) core;
+	struct GB* gb = (struct GB*) core->board;
+	GBVideoAssociateRenderer(&gb->video, &gbcore->renderer.d);
 	LR35902Reset(core->cpu);
 }
 
@@ -184,6 +186,7 @@ static void _GBCoreSetRTC(struct mCore* core, struct mRTCSource* rtc) {
 struct mCore* GBCoreCreate(void) {
 	struct GBCore* gbcore = malloc(sizeof(*gbcore));
 	struct mCore* core = &gbcore->d;
+	memset(&core->opts, 0, sizeof(core->opts));
 	core->cpu = 0;
 	core->board = 0;
 	core->init = _GBCoreInit;
diff --git a/src/gba/core.c b/src/gba/core.c
index 62d81bcd1..b2d3051bd 100644
--- a/src/gba/core.c
+++ b/src/gba/core.c
@@ -34,15 +34,12 @@ static bool _GBACoreInit(struct mCore* core) {
 	core->cpu = cpu;
 	core->board = gba;
 
-	memset(&core->opts, 0, sizeof(core->opts));
-
 	GBACreate(gba);
 	// TODO: Restore debugger and cheats
 	ARMSetComponents(cpu, &gba->d, 0, 0);
 	ARMInit(cpu);
 
 	GBAVideoSoftwareRendererCreate(&gbacore->renderer);
-	GBAVideoAssociateRenderer(&gba->video, &gbacore->renderer.d);
 
 	gba->keySource = &gbacore->keys;
 
@@ -140,7 +137,9 @@ static void _GBACoreUnloadROM(struct mCore* core) {
 }
 
 static void _GBACoreReset(struct mCore* core) {
+	struct GBACore* gbacore = (struct GBACore*) core;
 	struct GBA* gba = (struct GBA*) core->board;
+	GBAVideoAssociateRenderer(&gba->video, &gbacore->renderer.d);
 	ARMReset(core->cpu);
 	if (core->opts.skipBios) {
 		GBASkipBIOS(core->board);
@@ -220,6 +219,7 @@ static void _GBACoreSetRTC(struct mCore* core, struct mRTCSource* rtc) {
 struct mCore* GBACoreCreate(void) {
 	struct GBACore* gbacore = malloc(sizeof(*gbacore));
 	struct mCore* core = &gbacore->d;
+	memset(&core->opts, 0, sizeof(core->opts));
 	core->cpu = 0;
 	core->board = 0;
 	core->init = _GBACoreInit;
diff --git a/src/platform/opengl/gl.c b/src/platform/opengl/gl.c
index 93f32288e..776906b84 100644
--- a/src/platform/opengl/gl.c
+++ b/src/platform/opengl/gl.c
@@ -54,10 +54,10 @@ static void GBAGLContextResized(struct VideoBackend* v, unsigned w, unsigned h)
 	unsigned drawW = w;
 	unsigned drawH = h;
 	if (v->lockAspectRatio) {
-		if (w * 2 > h * 3) {
-			drawW = h * 3 / 2;
-		} else if (w * 2 < h * 3) {
-			drawH = w * 2 / 3;
+		if (w * v->height > h * v->width) {
+			drawW = h * v->width / v->height;
+		} else if (w * v->height < h * v->width) {
+			drawH = w * v->height / v->width;
 		}
 	}
 	glMatrixMode(GL_MODELVIEW);
diff --git a/src/platform/sdl/gl-sdl.c b/src/platform/sdl/gl-sdl.c
index 18777bd65..1f565ed4c 100644
--- a/src/platform/sdl/gl-sdl.c
+++ b/src/platform/sdl/gl-sdl.c
@@ -20,72 +20,33 @@ static void _doViewport(int w, int h, struct VideoBackend* v) {
 	v->clear(v);
 }
 
-#ifdef M_CORE_GBA
-#include "gba/gba.h"
-
-static bool mSDLGLInitGBA(struct mSDLRenderer* renderer);
-#endif
-#ifdef M_CORE_GB
-#include "gb/gb.h"
-
-static bool mSDLGLInitGB(struct mSDLRenderer* renderer);
-#endif
-
+static bool mSDLGLInit(struct mSDLRenderer* renderer);
 static void mSDLGLRunloop(struct mSDLRenderer* renderer, void* user);
 static void mSDLGLDeinit(struct mSDLRenderer* renderer);
 
-#ifdef M_CORE_GBA
-void mSDLGLCreateGBA(struct mSDLRenderer* renderer) {
-	renderer->init = mSDLGLInitGBA;
+void mSDLGLCreate(struct mSDLRenderer* renderer) {
+	renderer->init = mSDLGLInit;
 	renderer->deinit = mSDLGLDeinit;
 	renderer->runloop = mSDLGLRunloop;
 }
 
-bool mSDLGLInitGBA(struct mSDLRenderer* renderer) {
+bool mSDLGLInit(struct mSDLRenderer* renderer) {
 	mSDLGLCommonInit(renderer);
 
-	renderer->outputBuffer = malloc(VIDEO_HORIZONTAL_PIXELS * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
-	memset(renderer->outputBuffer, 0, VIDEO_HORIZONTAL_PIXELS * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
-	renderer->core->setVideoBuffer(renderer->core, renderer->outputBuffer, VIDEO_HORIZONTAL_PIXELS);
+	renderer->outputBuffer = malloc(renderer->width * renderer->height * BYTES_PER_PIXEL);
+	memset(renderer->outputBuffer, 0, renderer->width * renderer->height * BYTES_PER_PIXEL);
+	renderer->core->setVideoBuffer(renderer->core, renderer->outputBuffer, renderer->width);
 
 	GBAGLContextCreate(&renderer->gl);
 	renderer->gl.d.user = renderer;
 	renderer->gl.d.lockAspectRatio = renderer->lockAspectRatio;
 	renderer->gl.d.filter = renderer->filter;
 	renderer->gl.d.swap = mSDLGLCommonSwap;
-	renderer->gl.d.init(&renderer->gl.d, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, 0);
+	renderer->gl.d.init(&renderer->gl.d, renderer->width, renderer->height, 0);
 
 	_doViewport(renderer->viewportWidth, renderer->viewportHeight, &renderer->gl.d);
 	return true;
 }
-#endif
-
-#ifdef M_CORE_GB
-void mSDLGLCreateGB(struct mSDLRenderer* renderer) {
-	renderer->init = mSDLGLInitGB;
-	renderer->deinit = mSDLGLDeinit;
-	renderer->runloop = mSDLGLRunloop;
-}
-
-bool mSDLGLInitGB(struct mSDLRenderer* renderer) {
-	mSDLGLCommonInit(renderer);
-
-	// TODO: Pass texture size along
-	renderer->outputBuffer = malloc(GB_VIDEO_HORIZONTAL_PIXELS * GB_VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
-	memset(renderer->outputBuffer, 0, GB_VIDEO_HORIZONTAL_PIXELS * GB_VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
-	renderer->core->setVideoBuffer(renderer->core, renderer->outputBuffer, GB_VIDEO_HORIZONTAL_PIXELS);
-
-	GBAGLContextCreate(&renderer->gl);
-	renderer->gl.d.user = renderer;
-	renderer->gl.d.lockAspectRatio = renderer->lockAspectRatio;
-	renderer->gl.d.filter = renderer->filter;
-	renderer->gl.d.swap = mSDLGLCommonSwap;
-	renderer->gl.d.init(&renderer->gl.d, GB_VIDEO_HORIZONTAL_PIXELS, GB_VIDEO_VERTICAL_PIXELS, 0);
-
-	_doViewport(renderer->viewportWidth, renderer->viewportHeight, &renderer->gl.d);
-	return true;
-}
-#endif
 
 void mSDLGLRunloop(struct mSDLRenderer* renderer, void* user) {
 	struct mCoreThread* context = user;
diff --git a/src/platform/sdl/main.c b/src/platform/sdl/main.c
index 7ac2a2cbd..a3e020708 100644
--- a/src/platform/sdl/main.c
+++ b/src/platform/sdl/main.c
@@ -57,8 +57,6 @@ int main(int argc, char** argv) {
 	struct mSDLRenderer renderer = {};
 
 	struct mCoreOptions opts = {
-		.width = 0,
-		.height = 0,
 		.useBios = true,
 		.rewindEnable = true,
 		.audioBuffers = 512,
@@ -75,12 +73,12 @@ int main(int argc, char** argv) {
 	bool parsed = parseArguments(&args, argc, argv, &subparser);
 	if (!parsed || args.showHelp) {
 		usage(argv[0], subparser.usage);
-		mCoreConfigFreeOpts(&opts);
+		freeArguments(&args);
 		return !parsed;
 	}
 	if (args.showVersion) {
 		version(argv[0]);
-		mCoreConfigFreeOpts(&opts);
+		freeArguments(&args);
 		return 0;
 	}
 
@@ -91,21 +89,16 @@ int main(int argc, char** argv) {
 		if (!vf) {
 			printf("Could not open game. Are you sure the file exists?\n");
 			freeArguments(&args);
-			mCoreConfigFreeOpts(&opts);
 			return 1;
 		}
 #ifdef M_CORE_GBA
 		else if (GBAIsROM(vf)) {
 			platform = PLATFORM_GBA;
-			if (!opts.width) {
-				opts.width = VIDEO_HORIZONTAL_PIXELS;
-			}
-			if (!opts.height) {
-				opts.height = VIDEO_VERTICAL_PIXELS;
-			}
+			renderer.width = VIDEO_HORIZONTAL_PIXELS;
+			renderer.height = VIDEO_VERTICAL_PIXELS;
 			renderer.core = GBACoreCreate();
 #ifdef BUILD_GL
-			mSDLGLCreateGBA(&renderer);
+			mSDLGLCreate(&renderer);
 #elif defined(BUILD_GLES2) || defined(USE_EPOXY)
 			mSDLGLES2Create(&renderer);
 #else
@@ -116,15 +109,11 @@ int main(int argc, char** argv) {
 #ifdef M_CORE_GB
 		else if (GBIsROM(vf)) {
 			platform = PLATFORM_GB;
-			if (!opts.width) {
-				opts.width = GB_VIDEO_HORIZONTAL_PIXELS;
-			}
-			if (!opts.height) {
-				opts.height = GB_VIDEO_VERTICAL_PIXELS;
-			}
+			renderer.width = GB_VIDEO_HORIZONTAL_PIXELS;
+			renderer.height = GB_VIDEO_VERTICAL_PIXELS;
 			renderer.core = GBCoreCreate();
 #ifdef BUILD_GL
-			mSDLGLCreateGB(&renderer);
+			mSDLGLCreate(&renderer);
 #elif defined(BUILD_GLES2) || defined(USE_EPOXY)
 			mSDLGLES2CreateGB(&renderer);
 #else
@@ -135,48 +124,47 @@ int main(int argc, char** argv) {
 		else {
 			printf("Could not run game. Are you sure the file exists and is a compatible game?\n");
 			freeArguments(&args);
-			mCoreConfigFreeOpts(&opts);
 			return 1;
 		}
 	}
 
+	renderer.ratio = graphicsOpts.multiplier;
+	if (renderer.ratio == 0) {
+		renderer.ratio = 1;
+	}
+	opts.width = renderer.width * renderer.ratio;
+	opts.height = renderer.height * renderer.ratio;
+
+	if (!renderer.core->init(renderer.core)) {
+		freeArguments(&args);
+		return 1;
+	}
+
 	mInputMapInit(&renderer.core->inputMap, &GBAInputInfo);
 	mCoreInitConfig(renderer.core, PORT);
 	applyArguments(&args, &subparser, &renderer.core->config);
 
 	mCoreConfigLoadDefaults(&renderer.core->config, &opts);
+	mCoreLoadConfig(renderer.core);
 
-	// TODO: Load from config
-	renderer.viewportWidth = opts.width;
-	renderer.viewportHeight = opts.height;
+	renderer.viewportWidth = renderer.core->opts.width;
+	renderer.viewportHeight = renderer.core->opts.height;
 #if SDL_VERSION_ATLEAST(2, 0, 0)
-	renderer.player.fullscreen = opts.fullscreen;
+	renderer.player.fullscreen = renderer.core->opts.fullscreen;
 	renderer.player.windowUpdated = 0;
 #else
-	renderer.fullscreen = opts.fullscreen;
+	renderer.fullscreen = renderer.core->opts.fullscreen;
 #endif
 
-	renderer.ratio = graphicsOpts.multiplier;
-	if (renderer.ratio == 0) {
-		renderer.ratio = 1;
-	}
-
-	renderer.lockAspectRatio = opts.lockAspectRatio;
-	renderer.filter = opts.resampleVideo;
+	renderer.lockAspectRatio = renderer.core->opts.lockAspectRatio;
+	renderer.filter = renderer.core->opts.resampleVideo;
 
 	if (!mSDLInit(&renderer)) {
 		freeArguments(&args);
-		mCoreConfigFreeOpts(&opts);
-		mCoreConfigDeinit(&renderer.core->config);
+		renderer.core->deinit(renderer.core);
 		return 1;
 	}
 
-	if (renderer.core) {
-		// TODO: Check return code
-		renderer.core->init(renderer.core);
-	}
-	mCoreLoadConfig(renderer.core);
-
 	renderer.player.bindings = &renderer.core->inputMap;
 	mSDLInitBindingsGBA(&renderer.core->inputMap);
 	mSDLInitEvents(&renderer.events);
diff --git a/src/platform/sdl/main.h b/src/platform/sdl/main.h
index ebdd0759a..67ce4e494 100644
--- a/src/platform/sdl/main.h
+++ b/src/platform/sdl/main.h
@@ -62,6 +62,8 @@ struct mSDLRenderer {
 	bool fullscreen;
 #endif
 
+	unsigned width;
+	unsigned height;
 	int viewportWidth;
 	int viewportHeight;
 	int ratio;
@@ -98,8 +100,7 @@ struct mSDLRenderer {
 void mSDLSWCreate(struct mSDLRenderer* renderer);
 
 #ifdef BUILD_GL
-void mSDLGLCreateGBA(struct mSDLRenderer* renderer);
-void mSDLGLCreateGB(struct mSDLRenderer* renderer);
+void mSDLGLCreate(struct mSDLRenderer* renderer);
 #endif
 
 #if defined(BUILD_GLES2) || defined(USE_EPOXY)