medfall

commit ee347c1eba9eda1686b89316ea13a58c758b454f
parent 046e695924a7f12912966391906a0115ac166f91
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Sun Jan 17 18:00:48 +0000

Add benchmarking code

Diffstat:
benchmark.cc
 | 
58
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
benchmark.h
 | 
23
+++++++++++++++++++++++
btt.cc
 | 
4
++++
game.h
 | 
2
++
4 files changed, 87 insertions(+), 0 deletions(-)
diff --git a/benchmark.cc b/benchmark.cc
@@ -0,0 +1,58 @@
+// TODO: this header doesn't exist on windows
+#include <x86intrin.h>
+
+#include "intrinsics.h"
+#include "benchmark.h"
+#include "platform_atomic.h"
+
+#define MAX_TIMERS 4096
+
+struct Timer {
+	const char * fn;
+	const char * file;
+	int line;
+	volatile u64 total_clocks;
+	volatile u64 num_calls;
+};
+
+static Timer timers[ 4096 ];
+static volatile u32 num_timers = 0;
+
+ScopedTimer::ScopedTimer( u32 idx ) {
+	initial_clock = __rdtsc();
+	timer_idx = idx;
+}
+
+ScopedTimer::~ScopedTimer() {
+	u64 dt = __rdtsc() - initial_clock;
+	atomic_add_u64( &timers[ timer_idx ].total_clocks, dt );
+	atomic_add_u64( &timers[ timer_idx ].num_calls, 1 );
+}
+
+u32 benchmark_new_timer( const char * fn, const char * file, int line ) {
+	u32 idx = atomic_add_u32( &num_timers, 1 ) - 1;
+	assert( idx < MAX_TIMERS );
+
+	Timer info;
+	info.fn = fn;
+	info.file = file;
+	info.line = line;
+	info.total_clocks = 0;
+	info.num_calls = 0;
+
+	timers[ idx ] = info;
+
+	return idx;
+}
+
+void benchmark_print_timers() {
+	for( u64 i = 0; i < num_timers; i++ ) {
+		u64 clocks = timers[ i ].total_clocks;
+		u64 calls = timers[ i ].num_calls;
+
+		printf( "%s (%s:%d) called %llu times, %llu clocks, %llu avg\n",
+			timers[ i ].fn, timers[ i ].file, timers[ i ].line,
+			calls, clocks, clocks / calls
+		);
+	}
+}
diff --git a/benchmark.h b/benchmark.h
@@ -0,0 +1,23 @@
+#ifndef _BENCHMARK_H_
+#define _BENCHMARK_H_
+
+#include "intrinsics.h"
+
+struct ScopedTimer {
+	u64 initial_clock;
+	u32 timer_idx;
+
+	ScopedTimer( u32 idx );
+	~ScopedTimer();
+};
+
+u32 benchmark_new_timer( const char * fn, const char * file, int line );
+void benchmark_print_timers();
+
+// TODO: i think this works but double check to make sure it really does.
+#define TIMED_BLOCK( fn, file, line ) \
+	static u32 benchmark_timer_idx = benchmark_new_timer( fn, file, line ); \
+	ScopedTimer benchmark_timer( benchmark_timer_idx );
+#define TIMED_FUNCTION() TIMED_BLOCK( __FUNCTION__, __FILE__, __LINE__ )
+
+#endif // _BENCHMARK_H_
diff --git a/btt.cc b/btt.cc
@@ -176,6 +176,8 @@ static void btt_build(
 	BTT * const node,
 	const glm::ivec2 v0, const glm::ivec2 v1, const glm::ivec2 v2
 ) {
+	TIMED_FUNCTION();
+
 	const glm::ivec2 mid = ( v0 + v2 ) / 2;
 
 	if( !node->left ) {
@@ -329,4 +331,6 @@ extern "C" GAME_FRAME( game_frame ) {
 	glUniformMatrix4fv( state->test_outline_un_vp, 1, GL_FALSE, glm::value_ptr( VP ) );
 	immediate_render( &imm, state->test_outline_at_position, state->test_outline_at_colour );
 	glUseProgram( 0 );
+
+	benchmark_print_timers();
 }
diff --git a/game.h b/game.h
@@ -73,7 +73,9 @@
 
 #include <glm/glm.hpp>
 
+// TODO: this whole file blows
 #include "intrinsics.h"
+#include "benchmark.h"
 #include "assets.h"
 #include "terrain_manager.h"
 #include "btt.h"