Add FPS counter to console output

2 files changed, 20 insertions, 2 deletions

diff --git a/render_sdl.c b/render_sdl.c
index f91ca29..2c82cd1 100644
--- a/render_sdl.c
+++ b/render_sdl.c
@@ -162,7 +162,8 @@ void render_wait_quit(vdp_context * context)
 
 #define FRAME_DELAY 16
 #define MIN_DELAY 10
-
+uint32_t frame_counter = 0;
+uint32_t start = 0;
 void wait_render_frame(vdp_context * context)
 {
 	SDL_Event event;
@@ -184,6 +185,7 @@ void wait_render_frame(vdp_context * context)
 			}
 			break;
 		case SDL_QUIT:
+			puts("");
 			exit(0);
 		}
 	}
@@ -200,6 +202,15 @@ void wait_render_frame(vdp_context * context)
 		}
 	}
 	render_context(context);
+	frame_counter++;
+	if ((last_frame - start) > 1000) {
+		if (start) {
+			printf("\r%f fps", ((float)frame_counter) / (((float)(last_frame-start)) / 1000.0));
+			fflush(stdout);
+		}
+		start = last_frame;
+		frame_counter = 0;
+	}
 }
 
 
diff --git a/vdp.c b/vdp.c
index 8aa3f19..cc09f3a 100644
--- a/vdp.c
+++ b/vdp.c
@@ -892,14 +892,21 @@ void vdp_control_port_write(vdp_context * context, uint16_t value)
 	if (context->flags & FLAG_PENDING) {
 		context->address = (context->address & 0x3FFF) | (value << 14);
 		context->cd = (context->cd & 0x3) | ((value >> 2) & 0x3C);
+		if (context->cd & 0x30) {
+			puts("attempt to use DMA detected!");
+		}
+		//printf("New Address: %X, New CD: %X\n", context->address, context->cd);
 		context->flags &= ~FLAG_PENDING;
 	} else {
 		if ((value & 0xC000) == 0x8000) {
 			//Register write
 			uint8_t reg = (value >> 8) & 0x1F;
 			if (reg < VDP_REGS) {
-				//printf("register %d set to %X\n", reg, value);
+				//printf("register %d set to %X\n", reg, value & 0xFF);
 				context->regs[reg] = value;
+				/*if (reg == REG_MODE_2) {
+					printf("Display is now %s\n", (context->regs[REG_MODE_2] & DISPLAY_ENABLE) ? "enabled" : "disabled");
+				}*/
 			}
 		} else {
 			context->flags |= FLAG_PENDING;