Add performance-monitoring main thread

CMakeLists.txt

@@ -40,5 +40,9 @@ else()
 	include_directories(${SDL_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR})
 endif()
 
+if(BUILD_PERF)
+	set(MAIN_SRC ${CMAKE_SOURCE_DIR}/src/platform/perf-main.c)
+endif()
+
 add_executable(${BINARY_NAME} ${ARM_SRC} ${GBA_SRC} ${DEBUGGER_SRC} ${RENDERER_SRC} ${UTIL_SRC} ${PLATFORM_SRC} ${MAIN_SRC})
 target_link_libraries(${BINARY_NAME} m pthread ${DEBUGGER_LIB} ${SDL_LIBRARY} ${OPENGL_LIBRARY})

src/platform/perf-main.c

@@ -0,0 +1,77 @@
+#include "gba-thread.h"
+#include "gba.h"
+#include "renderers/video-software.h"
+
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void _GBAPerfRunloop(struct GBAThread* context, int* frames);
+static void _GBAPerfShutdown(int signal);
+
+static struct GBAThread* _thread;
+
+int main(int argc, char** argv) {
+	const char* fname = "test.rom";
+	if (argc > 1) {
+		fname = argv[1];
+	}
+	int fd = open(fname, O_RDONLY);
+	if (fd < 0) {
+		return 1;
+	}
+
+	signal(SIGINT, _GBAPerfShutdown);
+
+	struct GBAThread context;
+	struct GBAVideoSoftwareRenderer renderer;
+	GBAVideoSoftwareRendererCreate(&renderer);
+
+	renderer.outputBuffer = malloc(256 * 256 * 4);
+	renderer.outputBufferStride = 256;
+
+	context.fd = fd;
+	context.fname = fname;
+	context.useDebugger = 0;
+	context.renderer = &renderer.d;
+	context.frameskip = 0;
+	context.sync.videoFrameWait = 0;
+	context.sync.audioWait = 0;
+	context.startCallback = 0;
+	context.cleanCallback = 0;
+	_thread = &context;
+	GBAThreadStart(&context);
+
+	int frames = 0;
+	time_t start = time(0);
+	_GBAPerfRunloop(&context, &frames);
+	time_t end = time(0);
+	int duration = end - start;
+
+	GBAThreadJoin(&context);
+	close(fd);
+
+	free(renderer.outputBuffer);
+
+	printf("%u frames in %i seconds: %g fps (%gx)\n", frames, duration, frames / (float) duration, frames / (duration * 60.f));
+
+	return 0;
+}
+
+static void _GBAPerfRunloop(struct GBAThread* context, int* frames) {
+	while (context->state < THREAD_EXITING) {
+		if (GBASyncWaitFrameStart(&context->sync, 0)) {
+			++*frames;
+		}
+		GBASyncWaitFrameEnd(&context->sync);
+	}
+}
+
+static void _GBAPerfShutdown(int signal) {
+	pthread_mutex_lock(&_thread->stateMutex);
+	_thread->state = THREAD_EXITING;
+	pthread_mutex_unlock(&_thread->stateMutex);
+}