From f4295898e04de8ef2878aac1774dc7ccda501317 Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Wed, 22 Mar 2023 19:58:15 +0100
Subject: load static/tilemap.bin in ppusim

---
 src/ppu/consts.h |  6 ++++++
 src/ppu/ppu.c    | 24 ++++++++++++++++++++++++
 src/ppu/ppu.h    |  3 +++
 src/ppusim/sim.c | 32 ++++++++++----------------------
 src/ppusim/sim.h |  4 ++--
 5 files changed, 45 insertions(+), 24 deletions(-)

diff --git a/src/ppu/consts.h b/src/ppu/consts.h
index a27b7b7..d7caf5e 100644
--- a/src/ppu/consts.h
+++ b/src/ppu/consts.h
@@ -55,3 +55,9 @@
 #define HH_PPU_VRAM_AUX_OFFSET ((hh_ppu_addr_t) 0xde00)
 /** @brief auxiliary memory size in words */
 #define HH_PPU_VRAM_AUX_SIZE ((hh_ppu_addr_t) 0x0002)
+
+/** @brief sprite size in bytes */
+#define HH_PPU_BYTE_SPRITE_SIZE (HH_PPU_VRAM_TMM_SPRITE_SIZE * sizeof(hh_ppu_data_t))
+/** @brief sprite size in 32-bit words (for stm) */
+#define HH_PPU_NATIVE_SPRITE_SIZE (HH_PPU_BYTE_SPRITE_SIZE / sizeof(uint32_t))
+
diff --git a/src/ppu/ppu.c b/src/ppu/ppu.c
index df14b9f..1f46b16 100644
--- a/src/ppu/ppu.c
+++ b/src/ppu/ppu.c
@@ -3,6 +3,7 @@
 #include "ppu/consts.h"
 #include "ppu/internals.h"
 #include "ppu/ppu.h"
+#include "tilemap.h"
 
 void hh_ppu_update_foreground(unsigned index, hh_s_ppu_loc_fam_entry e) {
 	hh_s_ppu_vram_data s = hh_ppu_2nat_fam(e);
@@ -46,3 +47,26 @@ void hh_ppu_update_color(unsigned palette_index, unsigned color_index, hh_ppu_rg
 	hh_ppu_vram_write(c);
 	free(c.data);
 }
+
+void hh_ppu_load_tilemap() {
+	for (size_t sprite_idx = 0; sprite_idx < HH_TM_SIZE; sprite_idx++) {
+		for (size_t word_idx = 0; word_idx < HH_PPU_NATIVE_SPRITE_SIZE; word_idx++) {
+			uint32_t native_word = g_hh_tilemap_rom[word_idx + sprite_idx * HH_PPU_NATIVE_SPRITE_SIZE];
+			uint32_t native_word_bytes[4] = { // TODO: check endianness of stm32
+				(native_word >> 24) & 0xff,
+				(native_word >> 16) & 0xff,
+				(native_word >> 8) & 0xff,
+				(native_word >> 0) & 0xff,
+			};
+			uint16_t ppu_words[2] = {
+				(native_word_bytes[2] << 8) | (native_word_bytes[3] << 0),
+				(native_word_bytes[0] << 8) | (native_word_bytes[1] << 0),
+			};
+			hh_ppu_vram_write((hh_s_ppu_vram_data) {
+				.data = ppu_words,
+				.offset = HH_PPU_VRAM_TMM_OFFSET + sprite_idx * HH_PPU_VRAM_TMM_SPRITE_SIZE + word_idx * 2,
+				.size = 2,
+			});
+		}
+	}
+}
diff --git a/src/ppu/ppu.h b/src/ppu/ppu.h
index 75d97c1..46b58af 100644
--- a/src/ppu/ppu.h
+++ b/src/ppu/ppu.h
@@ -23,3 +23,6 @@ void hh_ppu_update_palette_table(hh_ppu_loc_palette_table_t table);
 void hh_ppu_update_palette(unsigned palette_index, hh_ppu_loc_palette_data_t palette);
 /** @brief update single color in palette */
 void hh_ppu_update_color(unsigned palette_index, unsigned color_index, hh_ppu_rgb_color_t color);
+
+/** @brief copy g_hh_tilemap_rom into PPU vram */
+void hh_ppu_load_tilemap();
diff --git a/src/ppusim/sim.c b/src/ppusim/sim.c
index 4d171a0..0f8d687 100644
--- a/src/ppusim/sim.c
+++ b/src/ppusim/sim.c
@@ -27,39 +27,27 @@ void hh_ppu_init() {
 
 	g_hh_ppusim_vram = malloc(sizeof(hh_ppu_data_t) * 0xffff);
 	memset(g_hh_ppusim_vram, 0x0000, 0xffff);
+	hh_ppusim_load_tilemap();
+
 	hh_ppu_load_tilemap();
 }
 
-void hh_ppu_load_tilemap() {
-	g_hh_tilemap_rom = NULL; // TODO: read/copy file (static/tilemap.bin)
-	//TODO: remove magic file name here
-	char* filename = "static/tiles.bin";
-	FILE* fp = fopen(filename,"rb");
-	if (!fp){
-		fprintf(stderr,"Error: Failed to load tiles.");
-		return;//error
-	}
-	int sprite_size = (HH_PPU_SPRITE_WIDTH * HH_PPU_SPRITE_HEIGHT);
-	fseek(fp, 0, SEEK_END);//goto EOF
-	int _size = ftell(fp)/sprite_size;
-	fseek(fp, 0, 0);//goto start of file
+void hh_ppusim_load_tilemap() {
+	FILE* fp = fopen("static/tilemap.bin", "rb");
 
-	for (int i = 0; i < _size; i++) {
-		uint8_t data[sprite_size];
+	fseek(fp, 0, SEEK_END);
+	size_t file_size = ftell(fp);
+	rewind(fp);
 
-		fread(data,sizeof(uint8_t),sprite_size,fp);
-		
-		hh_s_ppu_vram_data sprite = hh_ppu_2nat_sprite(data);
-		sprite.offset = i*HH_PPU_VRAM_TMM_SPRITE_SIZE;
-		hh_ppu_vram_write(sprite);
-		free(sprite.data);
-	}
+	g_hh_tilemap_rom = malloc(file_size);
+	fread(g_hh_tilemap_rom, file_size, 1, fp);
 	fclose(fp);
 }
 
 void hh_ppu_deinit() {
 	free(g_hh_ppusim_threads);
 	free(g_hh_ppusim_vram);
+	free(g_hh_tilemap_rom);
 
 	SDL_DestroyRenderer(g_hh_renderer);
 	SDL_DestroyWindow(g_hh_window);
diff --git a/src/ppusim/sim.h b/src/ppusim/sim.h
index 4d1d718..218d61d 100644
--- a/src/ppusim/sim.h
+++ b/src/ppusim/sim.h
@@ -5,5 +5,5 @@
 /** @brief max framerate for PPUSIM */
 #define HH_PPUSIM_FRAMERATE 60
 
-/** @brief pump tilemap from rom to ppu ram */
-void hh_ppu_load_tilemap(); //ppu sim?
+/** @brief load static/tilemap.bin into memory */
+void hh_ppusim_load_tilemap();
-- 
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