Fixed VRAM random value fill overhead

Makefile

@@ -11,8 +11,8 @@ clean:
 
 ls7emulator:
 	cd src
-	$(CC) ls7emulator.c -o ls7emulator $(CFLAGS)
-	
+	$(CC) ls7emulator.c -o ls7emulator $(CFLAGS) -O2
+
 	rm ../bin -rf
 	mkdir ../bin
 	cd ../bin

src/config.h

@@ -0,0 +1,18 @@
+#include <stdint.h>
+#include <SFML/System.h>
+#include <SFML/Graphics.h>
+
+
+#define NOP			0xEA		/* CPU NoOp */
+#define PAGESIZE 	0x1F		/* Pagesize of extra addressing of devices */
+#define VIDADDRS 	0xBE00		/* Video Address */
+#define VIAADDRS 	0xBF80		/* VIA Address */
+#define KBDADDRS 	0xBD00		/* Keyboard Register */
+
+#define RAMSIZE 	0x7FFF		/* RAM Page Size */
+#define RAMLOC  	0x0000		/* ROM Page Location */
+#define ROMSIZE 	0x3FFF		/* ROM Page Size */
+#define ROMLOC  	0xC000		/* ROM Page Location */
+
+#define BACKCOLOR sfBlack
+

src/cpu.c

@@ -4,12 +4,9 @@
  * Modified by Gabriel Weingardt                     *
  *****************************************************/
 
-#include <stdio.h>
 #include <stdint.h>
+#include "memory.h"
 
-//externally supplied functions
-extern uint8_t read6502(uint16_t address);
-extern void write6502(uint16_t address, uint8_t value);
 
 //6502 defines
 #define FLAG_CARRY     0x01
@@ -724,28 +721,6 @@ void irq6502() {
     pc = (uint16_t)read6502(0xFFFE) | ((uint16_t)read6502(0xFFFF) << 8);
 }
 
-uint8_t callexternal = 0;
-void (*loopexternal)();
-
-void exec6502(uint32_t tickcount) {
-    clockgoal6502 += tickcount;
-
-    while (clockticks6502 < clockgoal6502) {
-        opcode = read6502(pc++);
-
-        penaltyop = 0;
-        penaltyaddr = 0;
-
-        (*addrtable[opcode])();
-        (*optable[opcode])();
-        clockticks6502 += ticktable[opcode];
-        if (penaltyop && penaltyaddr) clockticks6502++;
-
-        if (callexternal) (*loopexternal)();
-    }
-
-}
-
 void step6502() {
     opcode = read6502(pc++);
 
@@ -758,12 +733,4 @@ void step6502() {
     if (penaltyop && penaltyaddr) clockticks6502++;
     clockgoal6502 = clockticks6502;
 
-    if (callexternal) (*loopexternal)();
-}
-
-void hookexternal(void *funcptr) {
-    if (funcptr != (void *)NULL) {
-        loopexternal = funcptr;
-        callexternal = 1;
-    } else callexternal = 0;
 }

src/events.c

@@ -0,0 +1,66 @@
+#include <stdint.h>
+
+#include <SFML/Graphics/RenderWindow.h>
+#include <SFML/System.h>
+#include <SFML/Graphics.h>
+#include <SFML/Window.h>
+
+extern float displayScale;
+
+extern void resetSystem();
+extern void irq6502();
+extern void nmi6502();
+extern void updateRenderStates();
+extern void scanKeyboard();
+
+static sfKeyCode currentKey = sfKeyUnknown;
+
+void pollEvents(sfRenderWindow *window){
+
+	sfEvent event;
+	while (sfRenderWindow_pollEvent(window, &event)) {
+		switch (event.type){
+			case sfEvtClosed:
+				sfRenderWindow_close(window);
+				break;
+				
+			case sfEvtResized:
+				sfRenderWindow_setView(window, sfView_createFromRect((sfFloatRect){0, 0, event.size.width, event.size.height}));
+				break;
+			case sfEvtKeyPressed:
+				switch (event.key.code){
+					case sfKeyEscape:
+						sfRenderWindow_close(window);
+						break;
+						
+					case sfKeyF2:
+						if (displayScale > 1) displayScale--;
+						updateRenderStates();
+						break;
+					case sfKeyF3:
+						displayScale++;
+						updateRenderStates();
+						break;
+					case sfKeyF5:
+						resetSystem();
+						break;
+					case sfKeyF12:
+						irq6502();
+						break;
+					case sfKeyF11:
+						nmi6502();
+						break;
+						
+					default:
+						currentKey = event.key.code;
+						break;
+				}
+				break;
+			case sfEvtKeyReleased:
+				currentKey = sfKeyUnknown;
+				break;
+					
+			default: break;
+		}
+	}
+}

src/keyboard.c

@@ -2,10 +2,10 @@
 #include <SFML/Window.h>
 
 extern uint8_t systemRegister;
+extern uint8_t keyboardResult;
+extern sfKeyCode currentKey;
 
-static uint8_t keyboardResult;
-
-static sfKeyCode scanMatrix[48] = {
+const static sfKeyCode scanMatrix[48] = {
 	sfKeyNum1, 	sfKeyNum2, 		sfKeyNum3, 	sfKeyNum4, 	sfKeyNum5, 	sfKeyNum6, 	sfKeyNum7, 	sfKeyNum8,
 	sfKeyQ, 	sfKeyW, 		sfKeyE, 	sfKeyR, 	sfKeyT, 	sfKeyY, 	sfKeyU, 	sfKeyI,
 	sfKeyA, 	sfKeyS, 		sfKeyD, 	sfKeyF, 	sfKeyG, 	sfKeyH, 	sfKeyJ, 	sfKeyK,
@@ -15,11 +15,11 @@ static sfKeyCode scanMatrix[48] = {
 };
 
 
-void scanKeyboard(const sfKeyCode key){
+void scanKeyboard(){
 	keyboardResult = 0;
 	
 	for (int i = 0; i < 8; i++) {
-		if (key == scanMatrix[i + (((systemRegister & 0x07) % 6) * 8)]){
+		if (currentKey == scanMatrix[i + (((systemRegister & 0x07) % 6) * 8)]){
 			keyboardResult |= (0x80 >> i);
 		}
 	}

src/ls7emulator.c

@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+#include <SFML/System.h>
+#include <SFML/Graphics.h>
+#include <SFML/Window.h>
+
+#include "ls7emulator.h"
+#include "config.h"
+#include "events.c"
+#include "cpu.c"
+#include "memory.c"
+#include "video.c"
+#include "keyboard.c"
+
+
+
+void openFile(const char *inputFile){
+    FILE *file = fopen(inputFile, "rb");
+    
+    if (file != NULL){
+        fseek(file, 0, SEEK_END);
+        long filelen = ftell(file);
+        rewind(file);
+        
+        fread(rom, filelen, 1, file);
+    
+        printf("Loaded File\n");
+    } else {
+        printf("Error while opening file\n");
+        exit(1);
+    }
+    
+    fclose(file);
+}
+
+void resetSystem(){
+    initVideo();
+    updateVideo();
+    reset6502();
+}
+
+void updateRenderStates(){
+    renderStates.transform = sfTransform_Identity;
+    sfTransform_scale(&renderStates.transform, displayScale, displayScale);
+}
+
+void drawScreen(){
+    sfRenderWindow_drawVertexArray(window, renderArray, &renderStates);
+}
+
+int main(int argc, char *argv[]){
+    window = sfRenderWindow_create((sfVideoMode){800, 600, 24}, "LS7 Emulator", sfResize | sfClose, NULL);
+    sfRenderWindow_setVerticalSyncEnabled(window, sfFalse);
+    sfRenderWindow_setFramerateLimit(window, 60);
+    sfRenderWindow_setKeyRepeatEnabled(window, sfFalse);
+
+    renderStates = sfRenderStates_default();
+    sfTransform_scale(&renderStates.transform, 2, 2);
+    
+    if (argc == 2) { openFile(argv[1]); }
+    else {
+        printf("Please specify a input file\n");
+        exit(1);
+    }
+    resetSystem();
+    
+    while (sfRenderWindow_isOpen(window)){
+        pollEvents(window);
+        
+        for (int i = 0; i < 4096 * 16; i++) step6502();
+        irq6502();
+        
+        sfRenderWindow_clear(window, BACKCOLOR);
+        updateVideo();
+        drawScreen();
+        sfRenderWindow_display(window);
+    }
+    
+    sfRenderWindow_destroy(window);
+
+    return 0;
+}
+
+

src/ls7emulator.h

@@ -0,0 +1,13 @@
+#include <SFML/System.h>
+#include <SFML/Graphics.h>
+#include <stdint.h>
+
+
+/* Display Scale used for VertexArray */
+static float displayScale = 2;
+
+
+static sfVertexArray *renderArray;
+
+static sfRenderWindow *window;
+static sfRenderStates renderStates;

src/memory.c

@@ -0,0 +1,64 @@
+#include <stdint.h>
+#include "memory.h"
+
+uint8_t read6502(uint16_t address){
+	switch (address){
+		case RAMLOC ... RAMLOC + RAMSIZE:
+			return ram[address - RAMLOC];
+			break;
+			
+		case ROMLOC ... ROMLOC + ROMSIZE:
+			return rom[address - ROMLOC];
+			break;
+			
+		case VIDADDRS ... VIDADDRS + PAGESIZE:
+			if ((address - VIDADDRS) % 4 == 3) return readVideo();
+			else return 0;
+			break;
+		
+		case 0xBD00:
+			scanKeyboard();
+			return keyboardResult;
+			break;
+			
+		default: 
+			return NOP;
+			break;
+	}
+}
+
+void write6502(uint16_t address, uint8_t value){
+	switch (address){
+		case RAMLOC ... RAMLOC + RAMSIZE:
+			ram[address - RAMLOC] = value;
+			break;
+			
+		case ROMLOC ... ROMLOC + ROMSIZE:
+			rom[address - ROMLOC] = value;
+			break;
+			
+		case VIDADDRS ... VIDADDRS + PAGESIZE:
+			switch ((address - VIDADDRS) % 4){
+				case 0:			/* Video X Register */
+					videoX = value;
+					break;
+				case 1:			/* Video Y Register */
+					videoY = value;
+					break;
+				case 2:			/* Video M Register */
+					videoMode = value;
+					break;
+				case 3:			/* Video A Register */
+					videoA = value;
+					writeVideo();
+					break;
+			}
+			break;
+				case 0xBC00:
+					systemRegister = value;
+					break;
+					
+				default: 
+					break;
+	}
+}

src/memory.h

@@ -0,0 +1,21 @@
+#include <stdint.h>
+
+#include "config.h"
+
+extern void scanKeyboard();
+extern void writeVideo();
+extern uint8_t readVideo();
+extern uint8_t videoX;
+extern uint8_t videoY;
+extern uint8_t videoMode;
+extern uint8_t videoA;
+
+static int8_t ram[RAMSIZE + 1];
+static int8_t rom[ROMSIZE + 1];
+
+static uint8_t systemRegister;
+static uint8_t keyboardResult;
+
+
+uint8_t read6502(uint16_t address);
+void write6502(uint16_t address, uint8_t value);

src/video.c

@@ -8,108 +8,106 @@
 /* Public Variables */
 extern sfVertexArray *renderArray;
 int8_t videoModified;
-int8_t videoMode;
+
+/* Hardware-like Registers */
+uint8_t videoX;
+uint8_t videoY;
+uint8_t videoMode;
+uint8_t videoA;
 
 /* Private Variables */
-static uint8_t video_row;
-static uint8_t video_value;
-static uint8_t video_colorValue;
-static sfColor video_displayColor;
-static sfColor video_foreColor;
-static sfColor video_backColor;
+static uint8_t videoRow;
+static uint8_t videoValue;
+static uint8_t videoColorValue;
+static sfColor videoDisplayColor;
+static sfColor videoForeColor;
+static sfColor videoBackColor;
 
-const sfColor video_upperPalette = (sfColor){ 64, 64, 64 };
+const static sfColor videoUpperPalette = (sfColor){ 64, 64, 64 };
 
-static 	sfColor *video_colorIndex[16] = {
-	&sfBlack,					// 0x0
-	&sfRed,						// 0x1
-	&sfGreen,					// 0x2
-	&sfYellow,					// 0x3
-	&sfBlue,					// 0x4
-	&sfMagenta,					// 0x5
-	&sfCyan,					// 0x6
-	&(sfColor){ 96, 96, 96 },	// 0x7
-	
-	&(sfColor){ 162, 162, 162 },// 0x8
-	&sfRed,						// 0x9
-	&sfGreen,					// 0xA
-	&sfYellow,					// 0xB
-	&sfBlue,					// 0xC
-	&sfMagenta,					// 0xD
-	&sfCyan,					// 0xE
-	&sfWhite,					// 0xF
+static sfColor *videoColorIndex[] = { 
+	&sfBlack, &sfRed, &sfGreen, &sfYellow, &sfBlue, &sfMagenta, &sfCyan, &sfWhite//&(sfColor){ 96, 96, 96 } ,
+	/*&(sfColor){ 0, 0, 0 },
+	&(sfColor){ 0xFF, 0, 0 },
+	&(sfColor){ 0, 0xFF, 0 },
+	&(sfColor){ 0xFF, 0xFF, 0 },
+	&(sfColor){ 0, 0, 0xFF },
+	&(sfColor){ 0xFF, 0, 0xFF },
+	&(sfColor){ 0, 0xFF, 0xFF },
+	&(sfColor){ 0xFF, 0xFF, 0xFF },*/
 };
+static uint8_t videoMemory[0x7FFF];
 
-static uint8_t video_memory[0x8000];	// Empty Memory with 32k space
+
+void writeVideo(){
+	videoMemory[videoX + (videoY * 128)] = videoA;
+	videoModified = 1;
+}
+
+uint8_t readVideo(){
+	return videoMemory[videoX + (videoY * 128)];
+}
 
 void initVideo(){
 	renderArray = sfVertexArray_create();
 	sfVertexArray_setPrimitiveType(renderArray, sfQuads);
 	
 	videoModified = 1;
-	videoMode = 0;
+	videoMode = 0x01;
 	
-	for (int i = 0x8; i < 0xF; i++){
-		//*video_colorIndex[i] = sfColor_add(*video_colorIndex[i], video_upperPalette);
-	}
-	
-	for (int i = 0; i < 0x8000; i++){
-		video_memory[i] = rand();
-	}
+	for (int i = 0; i < 0x7FFF; i++) videoMemory[i] = rand();
 }
 
 void updateVideo(){
-	sfVertexArray_clear(renderArray);
-	sfVertexArray_setPrimitiveType(renderArray, sfQuads);
-
-	videoModified = 0;
-	
-	for (int y = 0; y < 256; y++){
-		video_row = (int8_t)(y & 0x7);
+	if (videoModified){
+		sfVertexArray_clear(renderArray);
 		
-		for (int x = 0; x < 48; x++){
+		for (uint8_t y = 0; y < 255; y++){
+			videoRow = (int8_t)(y & 0x7);
 			
-			if (videoMode == 1){
-				/*  
-				 *           Text Address Format
-				 *           0bRRR1111AAAAAAAA
-				 * 
-				 *           R = row pins
-				 *           A = address
-				 */
+			for (uint8_t x = 0; x < 48; x++){
 				
-				// Get text index value
-				video_value = video_memory[(((y & 0xF8) >> 3) << 7) | x];
-				
-				// Index the value in font location
-				video_value = video_memory[(video_row | 0b1111000) + (video_value * 128)];
-				video_colorValue = video_memory[(((y & 0xF8) >> 3) << 7) + (x | 0x40)];
-			}
-			else {
-				video_value = video_memory[(y * 128) + x];
-				video_colorValue = video_memory[(y * 128) + (x | 0x40)];
-			}
-			
-			// Snipping out the upper 8 colors
-			//video_colorValue &= 0x77;
-			
-			video_foreColor = *video_colorIndex[(video_colorValue & 0x0F)];
-			video_backColor = *video_colorIndex[((video_colorValue & 0xF0) >> 4)];
-			
-			
-			for (int i = 0; i < 8; i++){
-				if (video_value & (128 >> i)){
-					video_displayColor = video_foreColor;
-				} else {
-					video_displayColor = video_backColor;
+				if ((videoMode & 0x01) == 0){
+					/*  
+					*           Text Address Format
+					*           0bRRR1111AAAAAAAA
+					* 
+					*           R = row pins
+					*           A = address
+					*/
+					
+					// Get text index value
+					videoValue = videoMemory[(((y & 0xF8) >> 3) << 7) | x];
+					
+					// Index the value in font location
+					videoValue = videoMemory[(videoRow | 0b1111000) + (videoValue * 128)];
+					videoColorValue = videoMemory[(((y & 0xF8) >> 3) << 7) + (x | 0x40)];
+				}
+				else {
+					videoValue = videoMemory[(y * 128) + x];
+					videoColorValue = videoMemory[(y * 128) + (x | 0x40)];
 				}
 				
-				sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i, y }, video_displayColor});
-				sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i + 1, y }, video_displayColor});
-				sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i + 1, y + 1 }, video_displayColor});
-				sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i, y + 1 }, video_displayColor});
+				// Snipping out the upper 8 colors
+				videoColorValue &= 0x77;
+				
+				videoForeColor = *videoColorIndex[(videoColorValue & 0x0F)];
+				videoBackColor = *videoColorIndex[((videoColorValue & 0xF0) >> 4)];
+				
+				
+				for (uint8_t i = 0; i < 8; i++){
+					if (videoValue & (128 >> i)) videoDisplayColor = videoBackColor;
+					else videoDisplayColor = videoForeColor;
+					
+					sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i, y }, videoDisplayColor});
+					sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i + 1, y }, videoDisplayColor});
+					sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i + 1, y + 1 }, videoDisplayColor});
+					sfVertexArray_append(renderArray, (sfVertex){ (sfVector2f){ (x * 8) + i, y + 1 }, videoDisplayColor});
+				}
 			}
 		}
+		
+		videoModified = 0;
 	}
 }