rend/if: Logging/verification of MD5(ta command list data)

This allows for some very primitive auto-automated testing, by comparing known good frames.
As this happens on the TA level, it doesn't actually require rendering (and thus it's server friendly)

Two new config entries under the new [testing] namespace control behavior
- ta.HashLogFile, file where data should be logged, empty if not logging
- ta.HashCheckFile, past log to check against, empty if not checking

The emu will crash via verify if the logs don't match, and exit(1) if they do

core/hw/pvr/Renderer_if.cpp

@@ -5,10 +5,16 @@
 
 #include "deps/zlib/zlib.h"
 
+#include "deps/crypto/md5.h"
+
 #if FEAT_HAS_NIXPROF
 #include "profiler/profiler.h"
 #endif
 
+#define FRAME_MD5 0x1
+FILE* fLogFrames;
+FILE* fCheckFrames;
+
 /*
 
 	rendv3 ideas
@@ -291,6 +297,48 @@ void rend_start_render()
 
 	if (ctx)
 	{
+		if (fLogFrames || fCheckFrames) {
+			MD5Context md5;
+			u8 digest[16];
+
+			MD5Init(&md5);
+			MD5Update(&md5, ctx->tad.thd_root, ctx->tad.End() - ctx->tad.thd_root);
+			MD5Final(digest, &md5);
+
+			if (fLogFrames) {
+				fputc(FRAME_MD5, fLogFrames);
+				fwrite(digest, 1, 16, fLogFrames);
+				fflush(fLogFrames);
+			}
+
+			if (fCheckFrames) {
+				u8 v;
+				u8 digest2[16];
+				int ch = fgetc(fCheckFrames);
+
+				if (ch == EOF) {
+					printf("Testing: TA Hash log matches, exiting\n");
+					exit(1);
+				}
+				
+				verify(ch == FRAME_MD5);
+
+				fread(digest2, 1, 16, fCheckFrames);
+
+				verify(memcmp(digest, digest2, 16) == 0);
+
+				
+			}
+
+			/*
+			u8* dig = digest;
+			printf("FRAME: %02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X\n",
+				digest[0], digest[1], digest[2], digest[3], digest[4], digest[5], digest[6], digest[7],
+				digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15]
+				);
+			*/
+		}
+
 		if (!ctx->rend.Overrun)
 		{
 			//printf("REP: %.2f ms\n",render_end_pending_cycles/200000.0);
@@ -366,6 +414,13 @@ void rend_end_wait()
 
 bool rend_init()
 {
+	if (fLogFrames = fopen(settings.pvr.HashLogFile.c_str(), "wb")) {
+		printf("Saving frame hashes to: '%s'\n", settings.pvr.HashLogFile.c_str());
+	}
+
+	if (fCheckFrames = fopen(settings.pvr.HashCheckFile.c_str(), "rb")) {
+		printf("Comparing frame hashes against: '%s'\n", settings.pvr.HashCheckFile.c_str());
+	}
 
 #ifdef NO_REND
 	renderer	 = rend_norend();
@@ -435,6 +490,11 @@ bool rend_init()
 
 void rend_term()
 {
+	if (fCheckFrames)
+		fclose(fCheckFrames);
+
+	if (fLogFrames)
+		fclose(fLogFrames);
 }
 
 void rend_vblank()

core/nullDC.cpp

@@ -260,6 +260,8 @@ void LoadSettings()
 #endif
 
 	settings.bios.UseReios = cfgLoadInt("config", "bios.UseReios", 0);
+	settings.pvr.HashLogFile = cfgLoadStr("testing", "ta.HashLogFile", "");
+	settings.pvr.HashCheckFile = cfgLoadStr("testing", "ta.HashCheckFile", "");
 
 #if (HOST_OS != OS_LINUX || defined(_ANDROID) || defined(TARGET_PANDORA))
 	settings.aica.BufferSize=2048;

core/types.h

@@ -696,6 +696,9 @@ struct settings_t
 		
 		u32 MaxThreads;
 		u32 SynchronousRendering;
+
+		string HashLogFile;
+		string HashCheckFile;
 	} pvr;
 
 	struct {