1 files changed, 129 insertions, 0 deletions
diff --git a/src/engine/draw_screen.c b/src/engine/draw_screen.c
new file mode 100644
index 0000000..d1d7a04
--- /dev/null
+++ b/src/engine/draw_screen.c
@@ -0,0 +1,129 @@
+#include "engine/draw_screen.h"
+
+hh_level_entity level;
+uint64_t offsetY=0;
+uint64_t offsetX=0;
+uint8_t hh_world_to_tile(vec2 pos){
+	
+	int index = (((pos.y/HH_PPU_SPRITE_HEIGHT)*level.size.x) + (pos.x/HH_PPU_SPRITE_WIDTH));//TODO: remove magic number(s)
+	int tile= level.place[index];
+	return tile;
+}
+
+void hh_update_screen(vec2 view, vec2 player){
+	int current_tile_y = view.y / HH_PPU_SPRITE_HEIGHT;
+	int current_tile_x = view.x / HH_PPU_SPRITE_WIDTH;
+	int offset_py = view.y - (offsetY / 40 * HH_PPU_SPRITE_HEIGHT);
+	int offset_px = view.x - offsetX * HH_PPU_SPRITE_WIDTH;
+	static int prev_ofsset = 0;
+
+	int size = MIN(HH_PPU_BG_CANVAS_TILES_H,level.size.x) * MIN(HH_PPU_BG_CANVAS_TILES_V,level.size.y);
+	if( (offset_py == 0 || offset_py > 230) && level.size.y > level.size.x && prev_ofsset != offset_py){
+		if(offset_py==0){
+			offsetY = (current_tile_y-14) * level.size.x;
+		}
+		else{
+			offsetY = current_tile_y * level.size.x;
+		}
+
+		// Update the background screen
+		for (int BAM_index = 0; BAM_index < size; BAM_index++) {
+			hh_ppu_update_background(BAM_index, (hh_s_ppu_loc_bam_entry){
+				.horizontal_flip = false,
+				.vertical_flip = false,
+				.palette_index = hh_get_palette(level.place[offsetY + BAM_index]),
+				.tilemap_index = level.place[offsetY + BAM_index],
+			});
+		}
+		prev_ofsset = offset_py;
+	}
+	else if ((offset_px == 0 || offset_px > 310) && level.size.x > level.size.y && prev_ofsset != offset_px)
+	{
+		if(offset_px==0){
+			offsetX = current_tile_x - 14;
+		}
+		else{
+			offsetX = current_tile_x;
+		}
+		// Update the background screen
+		for (int BAM_index = 0; BAM_index < size; BAM_index++) {
+			int var = (BAM_index / HH_PPU_BG_CANVAS_TILES_H) * level.size.x + MIN((BAM_index % HH_PPU_BG_CANVAS_TILES_H + offsetX),level.size.x);
+			hh_ppu_update_background(BAM_index, (hh_s_ppu_loc_bam_entry){
+				.horizontal_flip = false,
+				.vertical_flip = false,
+				.palette_index = hh_get_palette(level.place[var]),
+				.tilemap_index = level.place[var],
+			});
+		}
+	}
+
+	prev_ofsset = offset_px;
+	
+}
+void hh_setup_screen(hh_level_entity currentlevel){
+	hh_clear_screen();
+	hh_clear_sprite();
+	level = currentlevel;
+	offsetY=0;
+	offsetX=0;
+	int size = MIN(HH_PPU_BG_CANVAS_TILES_H, level.size.x) * MIN(HH_PPU_BG_CANVAS_TILES_V, level.size.y);
+	for (int BAM_index = 0; BAM_index < size; BAM_index++) {
+		int var = (BAM_index / HH_PPU_BG_CANVAS_TILES_H) * level.size.x + BAM_index % HH_PPU_BG_CANVAS_TILES_H;
+		hh_ppu_update_background(BAM_index, (hh_s_ppu_loc_bam_entry){
+			.horizontal_flip = false,
+			.vertical_flip   = false,
+			.palette_index   = hh_get_palette(currentlevel.place[var]),
+			.tilemap_index   = currentlevel.place[var],
+		});
+	}
+}
+vec_cor hh_draw_screen(vec2 player) {
+   static vec_cor previousViewport = {0, 0};
+	int offset_py = offsetY / 40 * HH_PPU_SPRITE_HEIGHT;
+	
+	int offset_px = (offsetX * HH_PPU_SPRITE_WIDTH) ;
+	vec_cor viewport = hh_update_camera(player,(vec2){.x = offset_px, .y = offset_py},(vec2){.x = HH_PPU_SCREEN_WIDTH + offset_px, .y = 480 + offset_py});//TODO: remove magic number(s)
+	viewport.x = CLAMP(viewport.x, 0, level.size.x * HH_PPU_SPRITE_WIDTH - HH_PPU_SCREEN_WIDTH);
+	viewport.y = CLAMP(viewport.y, 0, level.size.y * HH_PPU_SPRITE_HEIGHT - HH_PPU_SCREEN_HEIGHT);
+	
+	hh_update_screen((vec2){.y=viewport.y,.x=viewport.x},player);
+   if (viewport.x == previousViewport.x && viewport.y == previousViewport.y){}
+	else{
+		hh_ppu_update_aux((hh_s_ppu_loc_aux){
+			.bg_shift_x = viewport.x - offset_px,
+			.bg_shift_y = viewport.y - offset_py,
+			.fg_fetch	= 0,
+			.sysreset	= 0,
+		});
+		previousViewport = viewport;
+	}
+
+	return viewport;
+}
+
+void hh_clear_screen(){
+	// (HH_PPU_SCREEN_HEIGHT*HH_PPU_SCREEN_WIDTH)/(HH_PPU_SPRITE_HEIGHT*HH_PPU_SPRITE_WIDTH)
+	for (int i = 0; i < HH_PPU_BG_CANVAS_TILES_H*HH_PPU_BG_CANVAS_TILES_V; i++) {
+		hh_s_ppu_loc_bam_entry temp = {
+			.vertical_flip=false,.horizontal_flip = false,
+			.palette_index = 3,.tilemap_index = 0
+		};
+		hh_ppu_update_background(i,temp);
+		hh_ppu_update_color(3,0,(hh_ppu_rgb_color_t){0x0,0x0,0x0});
+	}
+	hh_ppu_update_aux((hh_s_ppu_loc_aux){
+		.bg_shift_x = 0,
+		.bg_shift_y = 0,
+		.fg_fetch	= 0,
+		.sysreset	= 0,
+	});
+}
+
+void hh_clear_sprite(){
+	for (int i = 0; i < HH_PPU_FG_SPRITE_COUNT; i++) {
+		hh_ppu_update_foreground(i,(hh_s_ppu_loc_fam_entry){
+			.position_x = -HH_PPU_SPRITE_WIDTH,
+			.position_y = -HH_PPU_SPRITE_HEIGHT,
+		});
+	}
+}