M src/platform/sdl/gl-main.c → src/platform/sdl/gl-main.c

@@ -95,7 +95,7 @@
 	GBASDLInitEvents(&renderer->events);
 	GBASDLInitAudio(&renderer->audio);
 
-	SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 0);
+	SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
 	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
 	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
 	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);

M src/platform/sdl/sdl-audio.c → src/platform/sdl/sdl-audio.c

@@ -4,6 +4,7 @@ #include "gba.h"
 #include "gba-thread.h"
 
 #define BUFFER_SIZE (GBA_AUDIO_SAMPLES >> 2)
+#define FPS_TARGET 60.f
 
 struct StereoSample {
 	Sint16 left;
@@ -87,7 +88,8 @@ if (!context || !audioContext->audio) {
 		memset(data, 0, len);
 		return;
 	}
-	audioContext->ratio = audioContext->obtainedSpec.freq / (float) audioContext->audio->sampleRate;
+	float ratio = 280896.0f * FPS_TARGET / GBA_ARM7TDMI_FREQUENCY;
+	audioContext->ratio = audioContext->obtainedSpec.freq / ratio / (float) audioContext->audio->sampleRate;
 	struct StereoSample* ssamples = (struct StereoSample*) data;
 	len /= 2 * audioContext->obtainedSpec.channels;
 	if (audioContext->obtainedSpec.channels == 2) {