5 files changed, 136 insertions, 0 deletions

diff --git a/stm32/main.c b/stm32/main.c
index 4722fe0..910d2dd 100644
--- a/stm32/main.c
+++ b/stm32/main.c
@@ -1,3 +1,40 @@
+#include <malloc.h>
+#include <math.h>
+#include <stdio.h>
+
+#include "ppu/ppu.h"
+#include "ppu/consts.h"
+
+hh_s_ppu_loc_sprite* hh_debug_circle_sprite() {
+	hh_s_ppu_loc_sprite* s = malloc(sizeof(hh_s_ppu_loc_sprite));
+
+	for (int x = 0; x < HH_PPU_SPRITE_WIDTH; x++)
+		for (int y = 0; y < HH_PPU_SPRITE_HEIGHT; y++)
+			*s[y * HH_PPU_SPRITE_WIDTH + x] = (pow(x - 8, 2) + pow(y - 8, 2) < 67) ? 1 : 0;
+
+	return s;
+}
+
 int main() {
+	hh_ppu_init();
+
+	hh_ppu_update_aux((hh_s_ppu_loc_aux) {
+		.bg_shift_x = 0,
+		.bg_shift_y = 0,
+		.fg_fetch = 0,
+		.sysreset = 0,
+	});
+
+	hh_s_ppu_loc_sprite* sprite = hh_debug_circle_sprite();
+	hh_ppu_update_sprite(0, *sprite);
+	free(sprite);
+
 	while (1);
 }
+
+void hh_ppu_vblank_interrupt() {
+	static unsigned long frame = 0;
+	frame++;
+
+
+}
diff --git a/stm32/ppu/consts.h b/stm32/ppu/consts.h
new file mode 100644
index 0000000..ee94a69
--- /dev/null
+++ b/stm32/ppu/consts.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#define HH_PPU_PALETTE_COUNT 8
+#define HH_PPU_PALETTE_COLOR_COUNT 8
+#define HH_PPU_RAM_BUS_ADDR_WIDTH 16
+#define HH_PPU_RAM_BUS_DATA_WIDTH 16
+#define HH_PPU_FG_SPRITE_COUNT 128
+#define HH_PPU_SPRITE_WIDTH 16
+#define HH_PPU_SPRITE_HEIGHT 16
+#define HH_PPU_SCREEN_WIDTH 320
+#define HH_PPU_SCREEN_HEIGHT 240
+#define HH_PPU_BG_CANVAS_TILES_H 40
+#define HH_PPU_BG_CANVAS_TILES_V 30
+
+#include "types.h"
+
+#define HH_PPU_VRAM_TMM_OFFSET ((hh_ppu_addr_t) 0x0000)
+#define HH_PPU_VRAM_TMM_SIZE ((hh_ppu_addr_t) 0xd000)
+#define HH_PPU_VRAM_BAM_OFFSET ((hh_ppu_addr_t) 0xd000)
+#define HH_PPU_VRAM_BAM_SIZE ((hh_ppu_addr_t) 0x04b0)
+#define HH_PPU_VRAM_FAM_OFFSET ((hh_ppu_addr_t) 0xd800)
+#define HH_PPU_VRAM_FAM_SIZE ((hh_ppu_addr_t) 0x0100)
+#define HH_PPU_VRAM_PAL_OFFSET ((hh_ppu_addr_t) 0xdc00)
+#define HH_PPU_VRAM_PAL_SIZE ((hh_ppu_addr_t) 0x0040)
+#define HH_PPU_VRAM_AUX_OFFSET ((hh_ppu_addr_t) 0xde00)
+#define HH_PPU_VRAM_AUX_SIZE ((hh_ppu_addr_t) 0x0002)
diff --git a/stm32/ppu/internals.h b/stm32/ppu/internals.h
new file mode 100644
index 0000000..ddb2196
--- /dev/null
+++ b/stm32/ppu/internals.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdbool.h>
+
+#include "types.h"
+
+typedef struct {
+	hh_ppu_addr_t offset;
+	hh_ppu_addr_t size;
+	hh_ppu_data_t* data;
+} hh_s_ppu_vram_data;
+
+bool hh_ppu_vram_valid_address(hh_ppu_addr_t addr);
+void hh_ppu_vram_write(hh_ppu_addr_t addr, hh_ppu_data_t data);
+void hh_ppu_vram_memcpy(void* a, hh_s_ppu_vram_data b);
+
+hh_s_ppu_vram_data* hh_ppu_2nat_bam(hh_s_ppu_loc_bam_entry);
+hh_s_ppu_vram_data* hh_ppu_2nat_fam(hh_s_ppu_loc_fam_entry);
+hh_s_ppu_vram_data* hh_ppu_2nat_aux(hh_s_ppu_loc_aux);
+hh_s_ppu_vram_data* hh_ppu_2nat_sprite(hh_ppu_loc_sprite_data_t);
+hh_s_ppu_vram_data* hh_ppu_2nat_pal(hh_ppu_loc_palette_data_t);
+
diff --git a/stm32/ppu/ppu.h b/stm32/ppu/ppu.h
new file mode 100644
index 0000000..ac01ef7
--- /dev/null
+++ b/stm32/ppu/ppu.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "types.h"
+
+void hh_ppu_vblank_interrupt();
+void hh_ppu_init();
+
+void hh_ppu_update_foreground(unsigned index, hh_s_ppu_loc_fam_entry e);
+void hh_ppu_update_background(unsigned index, hh_s_ppu_loc_bam_entry e);
+void hh_ppu_update_sprite(unsigned tilemap_index, hh_s_ppu_loc_sprite sprite);
+void hh_ppu_update_aux(hh_s_ppu_loc_aux aux);
diff --git a/stm32/ppu/types.h b/stm32/ppu/types.h
new file mode 100644
index 0000000..d7605a5
--- /dev/null
+++ b/stm32/ppu/types.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "consts.h"
+
+typedef uint16_t hh_ppu_addr_t;
+typedef uint16_t hh_ppu_data_t;
+
+typedef uint8_t hh_ppu_loc_sprite_data_t[HH_PPU_SPRITE_WIDTH * HH_PPU_SPRITE_HEIGHT];
+typedef uint8_t hh_ppu_loc_palette_data_t[HH_PPU_PALETTE_COLOR_COUNT];
+
+typedef hh_ppu_loc_sprite_data_t hh_s_ppu_loc_sprite;
+typedef hh_ppu_loc_palette_data_t hh_s_ppu_loc_palette;
+
+typedef struct {
+	bool horizontal_flip;
+	bool vertical_flip;
+	uint8_t palette_index;
+	uint8_t tilemap_index;
+} hh_s_ppu_loc_bam_entry;
+
+typedef struct {
+	bool horizontal_flip;
+	bool vertical_flip;
+	uint16_t position_x;
+	uint16_t position_y;
+	uint8_t palette_index;
+	uint8_t tilemap_index;
+} hh_s_ppu_loc_fam_entry;
+
+typedef struct {
+	bool sysreset;
+	bool fg_fetch;
+	uint16_t bg_shift_x;
+	uint16_t bg_shift_y;
+} hh_s_ppu_loc_aux;
+
+typedef uint16_t hh_ppu_native_color_t;