Utility to display a single frame

core/dispframe.cpp

@@ -0,0 +1,61 @@
+#include <signal.h>
+#include "hw/pvr/ta_ctx.h"
+#include "cfg/cfg.h"
+#include "rend/TexCache.h"
+
+extern cResetEvent rs;
+extern int rend_en;
+extern cResetEvent frame_finished;
+extern TA_context* rqueue;
+
+void SetREP(TA_context* cntx);
+TA_context* read_frame(const char* file, u8* vram_ref = NULL);
+void rend_set_fb_scale(float x,float y);
+
+#ifdef TARGET_DISPFRAME
+void dc_run()
+{
+	struct sigaction act, segv_oact;
+	memset(&act, 0, sizeof(act));
+	sigemptyset(&act.sa_mask);
+    act.sa_sigaction = SIG_IGN;
+    sigaction(SIGUSR1, &act, &segv_oact);
+
+    rend_set_fb_scale(1.0, 1.0);
+
+    char frame_path[512];
+    cfgLoadStr("config", "image", frame_path, "null");
+
+    printf("Loading %s\n", frame_path);
+
+	double t0 = os_GetSeconds();
+	TA_context*ctx = read_frame(frame_path);
+	double t1 = os_GetSeconds();
+	printf("Loaded context in %g ms\n", (t1- t0) * 1000);
+
+	while(rend_en)
+	{
+		tad_context saved_tad = ctx->tad;
+		rend_context saved_rend = ctx->rend;
+		FillBGP(ctx);
+
+		if (rqueue)
+			frame_finished.Wait();
+		if (QueueRender(ctx))  {
+			palette_update();
+#if !defined(TARGET_NO_THREADS)
+			rs.Set();
+#else
+			rend_single_frame();
+#endif
+		}
+		else
+			SetREP(NULL);	// Sched end of render interrupt
+		ctx = tactx_Alloc();
+		ctx->tad = saved_tad;
+		ctx->rend = saved_rend;
+
+		os_DoEvents();
+	}
+}
+#endif

core/hw/pvr/Renderer_if.cpp

@@ -226,6 +226,7 @@ bool rend_frame(TA_context* ctx, bool draw_osd) {
 		char name[32];
 		sprintf(name, "dcframe-%d", FrameCount);
 		dump_frame(name, _pvrrc, &vram[0]);
+		dump_frame_switch = false;
 	}
 	bool proc = renderer->Process(ctx);
 #if !defined(TARGET_NO_THREADS)

core/nullDC.cpp

@@ -78,8 +78,10 @@ s32 plugins_Init()
 	if (s32 rv = libPvr_Init())
 		return rv;
 
+	#ifndef TARGET_DISPFRAME
 	if (s32 rv = libGDR_Init())
 		return rv;
+	#endif
 	#if DC_PLATFORM == DC_PLATFORM_NAOMI
 	if (!naomi_cart_SelectFile(libPvr_GetRenderTarget()))
 		return rv_serror;
@@ -276,10 +278,12 @@ int dc_init(int argc,wchar* argv[])
 	return rv;
 }
 
+#ifndef TARGET_DISPFRAME
 void dc_run()
 {
 	sh4_cpu.Run();
 }
+#endif
 
 void dc_term()
 {

shell/linux/Makefile

@@ -338,6 +338,11 @@ ifdef NAOMI
     DC_PLATFORM=naomi
     EXECUTABLE=reicast_naomi.elf
     EXECUTABLE_NAME=reicast-naomi
+else ifdef DISPFRAME
+    CFLAGS += -D TARGET_DISPFRAME
+    DC_PLATFORM=dreamcast
+    EXECUTABLE=dispframe.elf
+    EXECUTABLE_NAME=dispframe
 else
     DC_PLATFORM=dreamcast
     EXECUTABLE=reicast.elf