306 lines
7.5 KiB
C
306 lines
7.5 KiB
C
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/* screen drawing */
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#include "game.h"
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#include "resource.h"
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#include "sys.h"
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#include "util.h"
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#define MAX_SPRITES 480
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#define MAX_SPRITESHEET_W 2048
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#define MAX_SPRITESHEET_H 1024
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#define MAX_FRONT_TILES 168
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static int _spr_pos_flags;
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static int _offset_x_center, _offset_y_center;
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void video_init() {
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_offset_x_center = (GAME_SCREEN_W > 320) ? (GAME_SCREEN_W - 320) / 2 : 0;
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_offset_y_center = (GAME_SCREEN_H > 200) ? (GAME_SCREEN_H - 200) / 2 : 0;
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}
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static void decode_planar(const uint8_t *src, uint8_t *dst, int dst_pitch, int w, int h, uint8_t transparent_color) {
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const int plane_size = h * w / 8;
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for (int y = 0; y < h; ++y) {
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for (int x = 0; x < w / 8; ++x) {
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for (int i = 0; i < 8; ++i) {
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const uint8_t mask = 1 << (7 - i);
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uint8_t color = 0;
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for (int b = 0; b < 4; ++b) {
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if (src[b * plane_size] & mask) {
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color |= (1 << b);
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}
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}
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if (color != transparent_color) {
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dst[x * 8 + i] = color;
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}
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}
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++src;
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}
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dst += dst_pitch;
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}
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}
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static void convert_planar_tile_4bpp(const uint8_t *src, uint8_t *dst, int dst_pitch) {
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static const int tile_h = 16;
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static const int tile_w = 16;
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static const int plane_size = 16 * (16 / 8);
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for (int y = 0; y < tile_h; ++y) {
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for (int x = 0; x < tile_w / 8; ++x) {
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for (int i = 0; i < 8; ++i) {
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const uint8_t mask = 1 << (7 - i);
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uint8_t color = 0;
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for (int b = 0; b < 4; ++b) {
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if (src[b * plane_size] & mask) {
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color |= (1 << b);
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}
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}
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if (i & 1) {
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dst[x * 4 + (i >> 1)] |= color;
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} else {
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dst[x * 4 + (i >> 1)] = color << 4;
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}
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}
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++src;
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}
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dst += dst_pitch;
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}
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}
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void video_draw_string(int offset, int hspace, const char *s) {
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offset += hspace;
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uint8_t *dst = g_res.vga + offset * 8;
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while (*s) {
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uint8_t code = *s++;
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if (code != 0x20) {
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code -= 0x30;
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if (code > 9) {
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code -= 2;
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}
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decode_planar(g_res.allfonts + code * 48, dst, 320, 8, 12, 0);
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}
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dst += 8;
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}
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}
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void video_draw_panel_number(int offset, int num) {
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const uint8_t *fnt = g_res.allfonts + 48 * 41 + 160 * 23;
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const int y = (offset * 8) / 320 + (GAME_SCREEN_H - 200);
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const int x = (offset * 8) % 320 + (GAME_SCREEN_W - 320) / 2;
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decode_planar(fnt + num * 96, g_res.vga + y * GAME_SCREEN_W + x, GAME_SCREEN_W, 16, 12, 0);
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}
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void video_draw_number(int offset, int num) {
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const uint8_t *fnt = g_res.allfonts + 0x1C70;
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const int y = (offset * 8) / 320;
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const int x = (offset * 8) % 320;
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decode_planar(fnt + num * 88, g_res.vga + y * GAME_SCREEN_W + x, GAME_SCREEN_W, 16, 11, 0);
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}
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void video_draw_character_spr(int offset, uint8_t chr) {
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const int y = (offset * 8) / 320;
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const int x = (offset * 8) % 320;
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video_draw_sprite(241 + chr, x, y, 0);
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}
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void video_draw_string2(int offset, const char *s) {
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while (*s) {
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const uint8_t chr = *s++;
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if (chr != ' ') {
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video_draw_character_spr(offset, chr - 0x41);
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}
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offset += 2;
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}
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}
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void video_clear() {
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memset(g_res.vga, 0, GAME_SCREEN_W * GAME_SCREEN_H);
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}
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void video_copy_img(const uint8_t *src) {
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decode_planar(src, g_res.background, 320, 320, 200, 0xFF);
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}
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void video_copy_background() {
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if (GAME_SCREEN_W * GAME_SCREEN_H == 64000) {
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memcpy(g_res.vga, g_res.background, 320 * 200);
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} else {
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memset(g_res.vga, 0, GAME_SCREEN_W * GAME_SCREEN_H);
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for (int y = 0; y < MIN(200, GAME_SCREEN_H); ++y) {
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for (int x = 0; x < GAME_SCREEN_W; x += 320) {
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memcpy(g_res.vga + y * GAME_SCREEN_W + x, g_res.background + y * 320, MIN(320, GAME_SCREEN_W - x));
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}
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}
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}
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}
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void video_draw_panel(const uint8_t *src) {
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const int h = GAME_SCREEN_H - PANEL_H;
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const int x = (GAME_SCREEN_W - 320) / 2;
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decode_planar(src, g_res.vga + h * GAME_SCREEN_W + x, GAME_SCREEN_W, 320, 23, 0xFF);
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}
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void video_draw_tile(const uint8_t *src, int x_offset, int y_offset) {
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int tile_w = 16;
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if (x_offset < 0) {
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tile_w += x_offset;
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src -= x_offset / 2;
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x_offset = 0;
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}
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if (x_offset + tile_w > TILEMAP_SCREEN_W) {
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tile_w = TILEMAP_SCREEN_W - x_offset;
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}
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if (tile_w <= 0) {
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return;
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}
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int tile_h = 16;
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if (y_offset < 0) {
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tile_h += y_offset;
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src -= y_offset * 8;
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y_offset = 0;
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}
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if (y_offset + tile_h > TILEMAP_SCREEN_H) {
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tile_h = TILEMAP_SCREEN_H - y_offset;
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}
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if (tile_h <= 0) {
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return;
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}
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uint8_t *dst = g_res.vga + y_offset * TILEMAP_SCREEN_W + x_offset;
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for (int y = 0; y < tile_h; ++y) {
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for (int x = 0; x < tile_w / 2; ++x) {
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const uint8_t color = src[x];
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const uint8_t c1 = color >> 4;
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if (c1 != 0) {
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dst[x * 2] = c1;
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}
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const uint8_t c2 = color & 15;
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if (c2 != 0) {
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dst[x * 2 + 1] = c2;
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}
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}
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src += 8;
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dst += TILEMAP_SCREEN_W;
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}
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}
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void video_convert_tiles(uint8_t *data, int len) {
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for (int offset = 0; offset < (len & ~127); offset += 128) {
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uint8_t buffer[16 * 8];
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convert_planar_tile_4bpp(data + offset, buffer, 8);
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memcpy(data + offset, buffer, 16 * 8);
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}
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}
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void video_load_front_tiles() {
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g_sys.render_unload_sprites(RENDER_SPR_FG);
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assert((g_res.frontlen & 127) == 0);
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const int count = g_res.frontlen / (16 * 8);
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assert(count <= MAX_FRONT_TILES);
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struct sys_rect_t r[MAX_FRONT_TILES];
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const int w = 256;
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const int h = 192;
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memset(g_res.vga, 0, w * h);
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int tile = 0;
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for (int y = 0; y < h; y += 16) {
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for (int x = 0; x < w; x += 16) {
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r[tile].x = x;
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r[tile].y = y;
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r[tile].w = 16;
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r[tile].h = 16;
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decode_planar(g_res.frontdat + tile * 16 * 8, g_res.vga + y * w + x, w, 16, 16, 0);
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++tile;
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if (tile == count) {
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g_sys.render_load_sprites(RENDER_SPR_FG, count, r, g_res.vga, w, h, 0x0, true);
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return;
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}
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}
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}
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}
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void video_transition_close() {
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}
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void video_transition_open() {
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}
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void video_load_sprites() {
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struct sys_rect_t r[MAX_SPRITES];
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uint8_t *data = (uint8_t *)calloc(MAX_SPRITESHEET_W * MAX_SPRITESHEET_H, 1);
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if (data) {
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int current_x = 0;
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int max_w = 0;
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int current_y = 0;
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int max_h = 0;
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int offset = 0;
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int count = 0;
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uint8_t value;
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for (int i = 0; count < g_res.spr_monsters_count; ++i) {
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if (g_res.dos_demo && (i >= 305 && i < 312)) {
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/* demo is missing 7 (monster) sprites compared to full game */
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continue;
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}
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const int j = i * 2;
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value = spr_size_tbl[j];
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value = (value >> 3) | ((value & 7) << 5);
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if ((value & 0xE0) != 0) {
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value &= ~0xE0;
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++value;
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}
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const int h = spr_size_tbl[j + 1];
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const int w = value * 8;
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assert(spr_size_tbl[j] == w);
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const int size = (h * value) * 4;
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if (current_x + w > MAX_SPRITESHEET_W) {
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current_y += max_h;
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if (current_x > max_w) {
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max_w = current_x;
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}
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current_x = 0;
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max_h = h;
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} else {
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if (h > max_h) {
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max_h = h;
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}
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}
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decode_planar(g_res.sprites + offset, data + current_y * MAX_SPRITESHEET_W + current_x, MAX_SPRITESHEET_W, w, h, 0xFF);
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offset += size;
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r[i].x = current_x;
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r[i].y = current_y;
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r[i].w = w;
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r[i].h = h;
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current_x += w;
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++count;
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}
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assert(count <= MAX_SPRITES);
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assert(max_w <= MAX_SPRITESHEET_W);
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assert(current_y + max_h <= MAX_SPRITESHEET_H);
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g_sys.render_unload_sprites(RENDER_SPR_GAME);
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g_sys.render_load_sprites(RENDER_SPR_GAME, count, r, data, MAX_SPRITESHEET_W, current_y + max_h, 0x0, true);
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free(data);
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print_debug(DBG_SCREEN, "sprites total_size %d count %d", offset, count);
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}
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}
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void video_set_sprite_pos_flags(int flags) {
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_spr_pos_flags = flags;
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}
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void video_draw_sprite(int num, int x, int y, int flag) {
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if (_spr_pos_flags) {
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x += _offset_x_center;
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y += _offset_y_center;
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}
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g_sys.render_add_sprite(RENDER_SPR_GAME, num, x, y, flag != 0);
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}
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void video_put_pixel(int x, int y, uint8_t color) {
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g_res.vga[y * GAME_SCREEN_W + x] = color;
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}
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