From eabac4c413c0b83caa4b9a97c6ab6dc3997b4ca0 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sun, 20 Jul 2014 23:45:30 -0700
Subject: [PATCH] Variable FPS target

---
 src/gba/gba-thread.c         | 6 ++++++
 src/gba/gba-thread.h         | 1 +
 src/platform/sdl/gl-main.c   | 1 +
 src/platform/sdl/sdl-audio.c | 6 +++---
 src/platform/sdl/sdl-audio.h | 1 +
 5 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/gba/gba-thread.c b/src/gba/gba-thread.c
index 9029ba9b0..9f9baf0ac 100644
--- a/src/gba/gba-thread.c
+++ b/src/gba/gba-thread.c
@@ -11,6 +11,8 @@
 
 #include <signal.h>
 
+static const float _defaultFPSTarget = 60.f;
+
 #ifdef USE_PTHREADS
 static pthread_key_t _contextKey;
 static pthread_once_t _contextOnce = PTHREAD_ONCE_INIT;
@@ -202,6 +204,10 @@ bool GBAThreadStart(struct GBAThread* threadContext) {
 		threadContext->rewindBuffer = 0;
 	}
 
+	if (!threadContext->fpsTarget) {
+		threadContext->fpsTarget = _defaultFPSTarget;
+	}
+
 	if (threadContext->rom && !GBAIsROM(threadContext->rom)) {
 		threadContext->rom->close(threadContext->rom);
 		threadContext->rom = 0;
diff --git a/src/gba/gba-thread.h b/src/gba/gba-thread.h
index a870b9610..072fd4a13 100644
--- a/src/gba/gba-thread.h
+++ b/src/gba/gba-thread.h
@@ -56,6 +56,7 @@ struct GBAThread {
 	const char* fname;
 	int activeKeys;
 	int frameskip;
+	float fpsTarget;
 
 	// Threading state
 	Thread thread;
diff --git a/src/platform/sdl/gl-main.c b/src/platform/sdl/gl-main.c
index acc5f4363..f1114f0f6 100644
--- a/src/platform/sdl/gl-main.c
+++ b/src/platform/sdl/gl-main.c
@@ -230,6 +230,7 @@ static void _GBASDLDeinit(struct GLSoftwareRenderer* renderer) {
 static void _GBASDLStart(struct GBAThread* threadContext) {
 	struct GLSoftwareRenderer* renderer = threadContext->userData;
 	renderer->audio.audio = &threadContext->gba->audio;
+	renderer->audio.thread = threadContext;
 }
 
 static void _GBASDLClean(struct GBAThread* threadContext) {
diff --git a/src/platform/sdl/sdl-audio.c b/src/platform/sdl/sdl-audio.c
index fdb1f4818..ac4d0c3d6 100644
--- a/src/platform/sdl/sdl-audio.c
+++ b/src/platform/sdl/sdl-audio.c
@@ -4,7 +4,6 @@
 #include "gba-thread.h"
 
 #define BUFFER_SIZE (GBA_AUDIO_SAMPLES >> 2)
-#define FPS_TARGET 60.f
 
 static void _GBASDLAudioCallback(void* context, Uint8* data, int len);
 
@@ -17,10 +16,11 @@ bool GBASDLInitAudio(struct GBASDLAudio* context) {
 	context->desiredSpec.freq = 44100;
 	context->desiredSpec.format = AUDIO_S16SYS;
 	context->desiredSpec.channels = 2;
-	context->desiredSpec.samples = GBA_AUDIO_SAMPLES;
+	context->desiredSpec.samples = BUFFER_SIZE;
 	context->desiredSpec.callback = _GBASDLAudioCallback;
 	context->desiredSpec.userdata = context;
 	context->audio = 0;
+	context->thread = 0;
 	context->drift = 0.f;
 	if (SDL_OpenAudio(&context->desiredSpec, &context->obtainedSpec) < 0) {
 		GBALog(0, GBA_LOG_ERROR, "Could not open SDL sound system");
@@ -43,7 +43,7 @@ static void _GBASDLAudioCallback(void* context, Uint8* data, int len) {
 		memset(data, 0, len);
 		return;
 	}
-	audioContext->ratio = GBAAudioCalculateRatio(audioContext->audio, FPS_TARGET, audioContext->obtainedSpec.freq);
+	audioContext->ratio = GBAAudioCalculateRatio(audioContext->audio, audioContext->thread->fpsTarget, audioContext->obtainedSpec.freq);
 	struct GBAStereoSample* ssamples = (struct GBAStereoSample*) data;
 	len /= 2 * audioContext->obtainedSpec.channels;
 	if (audioContext->obtainedSpec.channels == 2) {
diff --git a/src/platform/sdl/sdl-audio.h b/src/platform/sdl/sdl-audio.h
index 78e51f134..436b9286a 100644
--- a/src/platform/sdl/sdl-audio.h
+++ b/src/platform/sdl/sdl-audio.h
@@ -11,6 +11,7 @@ struct GBASDLAudio {
 	float drift;
 	float ratio;
 	struct GBAAudio* audio;
+	struct GBAThread* thread;
 };
 
 bool GBASDLInitAudio(struct GBASDLAudio* context);