From 6321f071ed2ab36242e857a9414b7f4c53092d72 Mon Sep 17 00:00:00 2001
From: Peter Fors <peter.fors@mindkiller.com>
Date: Wed, 16 Apr 2025 12:37:40 +0200
Subject: Battletoads working

---
 mknes.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 51 insertions(+), 17 deletions(-)

(limited to 'mknes.c')

diff --git a/mknes.c b/mknes.c
index b959230..9b58753 100644
--- a/mknes.c
+++ b/mknes.c
@@ -16,7 +16,7 @@
 #define PRG_ROM_SIZE	(512 * 1024)
 #define CHR_ROM_SIZE	(512 * 1024)
 #define PIXELS_SIZE	(256 * 240)
-#define RAM_SIZE		0x800
+#define RAM_SIZE		0x1000		// 0x800 in reality, but for aligned alloc it must be the size of the alignment (4096)
 #define SRAM_SIZE		0x2000
 #define CIRAM_SIZE	0x1000
 #define CHR_RAM_SIZE	0x4000
@@ -89,6 +89,7 @@ static GLFWwindow *window;
 #include "opengl.c"
 #include "render.c"
 
+static uint32_t frames;		// debug information
 
 // NES core
 #include "mapper.h"
@@ -104,33 +105,62 @@ static GLFWwindow *window;
 #include "callbacks.c"
 struct nes_state nstate;
 
-static uint32_t frames;
 
 static struct nes_state *allocate_nes_state(void) {
 	struct nes_state *state = (struct nes_state*)calloc(1, sizeof(struct nes_state));
 	if(!state) return 0;
 
-	size_t total_size = (PRG_ROM_SIZE + CHR_ROM_SIZE + PIXELS_SIZE + RAM_SIZE + SRAM_SIZE + CIRAM_SIZE + CHR_RAM_SIZE+ 4095) & ~0xfff;
-
-	uint8_t *m = (uint8_t*)aligned_alloc(4096, total_size);
-	memset(m, 0, total_size);
-
-	size_t offset = 0;
-	state->prg_rom	= m + offset; offset += PRG_ROM_SIZE;	// DO NOT MOVE THIS, as this is the pointer we free later.
-	state->chr_rom	= m + offset; offset += CHR_ROM_SIZE;
-	state->pixels	= m + offset; offset += PIXELS_SIZE;
-	state->ram		= m + offset; offset += RAM_SIZE;
-	state->sram		= m + offset; offset += SRAM_SIZE;
-	state->ciram	= m + offset; offset += CIRAM_SIZE;
-	state->chr_ram	= m + offset; offset += CHR_RAM_SIZE;
+	state->prg_rom	= aligned_alloc(4096, PRG_ROM_SIZE);
+	state->chr_rom	= aligned_alloc(4096, CHR_ROM_SIZE);
+	state->pixels	= aligned_alloc(4096, PIXELS_SIZE);
+	state->ram		= aligned_alloc(4096, RAM_SIZE);
+	state->sram		= aligned_alloc(4096, SRAM_SIZE);
+	state->ciram	= aligned_alloc(4096, CIRAM_SIZE);
+	state->chr_ram	= aligned_alloc(4096, CHR_RAM_SIZE);
+	memset(state->prg_rom, 0, PRG_ROM_SIZE);
+	memset(state->chr_rom, 0, CHR_ROM_SIZE);
+	memset(state->pixels, 0, PIXELS_SIZE);
+	memset(state->ram, 0, RAM_SIZE);
+	memset(state->sram, 0, SRAM_SIZE);
+	memset(state->ciram, 0, CIRAM_SIZE);
+	memset(state->chr_ram, 0, CHR_RAM_SIZE);
 	return state;
 }
 
 static void free_nes_state(struct nes_state *s) {
 	free(s->prg_rom);
+	free(s->chr_rom);
+	free(s->pixels);
+	free(s->ram);
+	free(s->sram);
+	free(s->ciram);
+	free(s->chr_ram);
 	free(s);
 }
 
+
+
+
+static void dump_nametable_text(struct nes_state *state, const char *filename) {
+	FILE *f = fopen(filename, "w");
+	if(!f) return;
+
+	for(int y = 0; y < 30; y++) {
+		for(int x = 0; x < 32; x++) {
+			uint16_t addr = y * 32 + x;
+			uint8_t tile = state->ciram[addr];	// assuming NT0 is mapped to 0x000
+			fprintf(f, "%02x ", tile);
+		}
+		fprintf(f, "\n");
+	}
+	fclose(f);
+}
+
+
+
+
+
+
 int main(int argc, char **argv) {
 #ifdef _WIN32
 	timeBeginPeriod(1);
@@ -173,7 +203,7 @@ int main(int argc, char **argv) {
 	// ines2_load(nstate, "data/0003/Friday the 13th (USA).zip");
 	// ines2_load(nstate, "data/0003/Ghostbusters (Japan).zip");
 	// ines2_load(nstate, "data/0003/Gradius (USA).zip");
-	// ines2_load(nstate, "data/0007/Battletoads (USA).zip");
+	ines2_load(nstate, "data/0007/Battletoads (USA).zip");
 	// ines2_load(nstate, "data/0007/Beetlejuice (USA).zip");
 	// ines2_load(nstate, "data/0007/Cabal (USA).zip");
 
@@ -229,7 +259,7 @@ int main(int argc, char **argv) {
 
 			timer_start(timer);
 
-#if 1
+#if 0
 			for(uint32_t i = 0; i < 0x5000; ++ i) {
 				while(!nstate->ppu.frame_ready) {
 					// PROFILE_NAMED("nes emulator");
@@ -243,6 +273,8 @@ int main(int argc, char **argv) {
 				timer_wait(timer);
 				glfwPollEvents();
 
+// printf("Frame: %d\n", frames);
+
 				while(!nstate->ppu.frame_ready) {
 					// PROFILE_NAMED("nes emulator");
 					cpu_tick(nstate);
@@ -250,6 +282,8 @@ int main(int argc, char **argv) {
 				nstate->ppu.frame_ready = 0;
 				frames++;
 
+dump_nametable_text(nstate, "_foofbomb.txt");
+
 				uint32_t * restrict dst = display_buffer;	//buffer;
 				uint8_t * restrict src = nstate->pixels;
 				for(uint32_t y = 0; y < 240; ++y) {
-- 
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