Higher resolution timers for bench.
http://codereview.appspot.com/4548090/
git-svn-id: http://skia.googlecode.com/svn/trunk@1534 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/BenchGpuTimer_gl.cpp b/bench/BenchGpuTimer_gl.cpp
new file mode 100644
index 0000000..ec2145d
--- /dev/null
+++ b/bench/BenchGpuTimer_gl.cpp
@@ -0,0 +1,181 @@
+#include "BenchGpuTimer_gl.h"
+#include <string.h>
+
+//GL
+#define BENCH_GL_FUNCTION_TYPE
+#if defined(SK_MESA)
+ #include <GL/osmesa.h>
+ #define SK_BENCH_CONTEXT_CHECK (NULL != OSMesaGetCurrentContext())
+
+ #define SK_GL_GET_PROC(F) gBenchGL.f ## F = (BenchGL ## F ## Proc) \
+ OSMesaGetProcAddress("gl" #F);
+ #define SK_GL_GET_PROC_SUFFIX(F, S) gBenchGL.f ## F = (BenchGL##F##Proc)\
+ OSMesaGetProcAddress("gl" #F #S);
+
+#elif defined(SK_BUILD_FOR_WIN32)
+ #define WIN32_LEAN_AND_MEAN 1
+ #include <Windows.h>
+ #include <GL/GL.h>
+ #define SK_BENCH_CONTEXT_CHECK (NULL != wglGetCurrentContext())
+
+ #undef BENCH_GL_FUNCTION_TYPE
+ #define BENCH_GL_FUNCTION_TYPE __stdcall
+
+ #define SK_GL_GET_PROC(F) gBenchGL.f ## F = (BenchGL ## F ## Proc) \
+ wglGetProcAddress("gl" #F);
+ #define SK_GL_GET_PROC_SUFFIX(F, S) gBenchGL.f ## F = (BenchGL##F##Proc)\
+ wglGetProcAddress("gl" #F #S);
+
+#elif defined(SK_BUILD_FOR_MAC)
+ #include <OpenGL/gl.h>
+ #include <OpenGL/CGLCurrent.h>
+ #define SK_BENCH_CONTEXT_CHECK (NULL != CGLGetCurrentContext())
+
+#elif defined(SK_BUILD_FOR_UNIX)
+ #include <GL/gl.h>
+ #include <GL/glx.h>
+ #define SK_BENCH_CONTEXT_CHECK (NULL != glXGetCurrentContext())
+
+ #define SK_GL_GET_PROC(F) gBenchGL.f ## F = (BenchGL ## F ## Proc) \
+ glXGetProcAddressARB(reinterpret_cast<const GLubyte*>("gl" #F));
+ #define SK_GL_GET_PROC_SUFFIX(F, S) gBenchGL.f ## F = (BenchGL##F##Proc)\
+ glXGetProcAddressARB(reinterpret_cast<const GLubyte*>("gl" #F #S));
+#else
+ #error unsupported platform
+#endif
+
+#define BenchGL_TIME_ELAPSED 0x88BF
+#define BenchGL_QUERY_RESULT 0x8866
+#define BenchGL_QUERY_RESULT_AVAILABLE 0x8867
+
+#if defined(SK_BUILD_FOR_WIN32)
+typedef UINT64 BenchGLuint64;
+#else
+#include <stdint.h>
+typedef uint64_t BenchGLuint64;
+#endif
+
+typedef void (BENCH_GL_FUNCTION_TYPE *BenchGLGenQueriesProc) (GLsizei n, GLuint *ids);
+typedef void (BENCH_GL_FUNCTION_TYPE *BenchGLBeginQueryProc) (GLenum target, GLuint id);
+typedef void (BENCH_GL_FUNCTION_TYPE *BenchGLEndQueryProc) (GLenum target);
+typedef void (BENCH_GL_FUNCTION_TYPE *BenchGLDeleteQueriesProc) (GLsizei n, const GLuint *ids);
+typedef void (BENCH_GL_FUNCTION_TYPE *BenchGLGetQueryObjectivProc) (GLuint id, GLenum pname, GLint *params);
+typedef void (BENCH_GL_FUNCTION_TYPE *BenchGLGetQueryObjectui64vProc) (GLuint id, GLenum pname, BenchGLuint64 *params);
+
+struct BenchGLInterface {
+ bool fHasTimer;
+ BenchGLGenQueriesProc fGenQueries;
+ BenchGLBeginQueryProc fBeginQuery;
+ BenchGLEndQueryProc fEndQuery;
+ BenchGLDeleteQueriesProc fDeleteQueries;
+ BenchGLGetQueryObjectivProc fGetQueryObjectiv;
+ BenchGLGetQueryObjectui64vProc fGetQueryObjectui64v;
+};
+
+static bool BenchGLCheckExtension(const char* ext,
+ const char* extensionString) {
+ int extLength = strlen(ext);
+
+ while (true) {
+ int n = strcspn(extensionString, " ");
+ if (n == extLength && 0 == strncmp(ext, extensionString, n)) {
+ return true;
+ }
+ if (0 == extensionString[n]) {
+ return false;
+ }
+ extensionString += n+1;
+ }
+
+ return false;
+}
+
+static BenchGLInterface gBenchGL;
+static bool gBenchGLInterfaceInit = false;
+
+static void BenchGLSetDefaultGLInterface() {
+ gBenchGL.fHasTimer = false;
+ if (gBenchGLInterfaceInit || !SK_BENCH_CONTEXT_CHECK) return;
+
+ const char* glExts =
+ reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
+ const GLboolean ext =
+ BenchGLCheckExtension("GL_EXT_timer_query", glExts);
+ const GLboolean arb =
+ BenchGLCheckExtension("GL_ARB_timer_query", glExts);
+ if (ext || arb) {
+#if defined(SK_BUILD_FOR_MAC)
+ #if GL_EXT_timer_query || GL_ARB_timer_query
+ gBenchGL.fHasTimer = true;
+ gBenchGL.fGenQueries = glGenQueries;
+ gBenchGL.fBeginQuery = glBeginQuery;
+ gBenchGL.fEndQuery = glEndQuery;
+ gBenchGL.fDeleteQueries = glDeleteQueries;
+ gBenchGL.fGetQueryObjectiv = glGetQueryObjectiv;
+ #endif
+ #if GL_ARB_timer_query
+ gBenchGL.fGetQueryObjectui64v = glGetQueryObjectui64v;
+ #elif GL_EXT_timer_query
+ gBenchGL.fGetQueryObjectui64v = glGetQueryObjectui64vEXT;
+ #endif
+#else
+ gBenchGL.fHasTimer = true;
+ SK_GL_GET_PROC(GenQueries)
+ SK_GL_GET_PROC(BeginQuery)
+ SK_GL_GET_PROC(EndQuery)
+ SK_GL_GET_PROC(DeleteQueries)
+
+ SK_GL_GET_PROC(GetQueryObjectiv)
+ if (arb) {
+ SK_GL_GET_PROC(GetQueryObjectui64v)
+ } else {
+ SK_GL_GET_PROC_SUFFIX(GetQueryObjectui64v, EXT)
+ }
+#endif
+ }
+ gBenchGLInterfaceInit = true;
+}
+
+BenchGpuTimer::BenchGpuTimer() {
+ BenchGLSetDefaultGLInterface();
+ if (gBenchGL.fHasTimer) {
+ gBenchGL.fGenQueries(1, &this->fQuery);
+ }
+}
+
+BenchGpuTimer::~BenchGpuTimer() {
+ if (gBenchGL.fHasTimer) {
+ gBenchGL.fDeleteQueries(1, &this->fQuery);
+ }
+}
+
+void BenchGpuTimer::startGpu() {
+ if (!gBenchGL.fHasTimer) return;
+
+ this->fStarted = true;
+ gBenchGL.fBeginQuery(BenchGL_TIME_ELAPSED, this->fQuery);
+}
+
+/**
+ * It is important to stop the cpu clocks first,
+ * as this will cpu wait for the gpu to finish.
+ */
+double BenchGpuTimer::endGpu() {
+ if (!gBenchGL.fHasTimer) return 0;
+
+ this->fStarted = false;
+ gBenchGL.fEndQuery(BenchGL_TIME_ELAPSED);
+
+ GLint available = 0;
+ while (!available) {
+ gBenchGL.fGetQueryObjectiv(this->fQuery
+ , BenchGL_QUERY_RESULT_AVAILABLE
+ , &available);
+ }
+ BenchGLuint64 totalGPUTimeElapsed = 0;
+ gBenchGL.fGetQueryObjectui64v(this->fQuery
+ , BenchGL_QUERY_RESULT
+ , &totalGPUTimeElapsed);
+
+ return totalGPUTimeElapsed / 1000000.0;
+}