kichikuou_system3-sdl2/src/sys/ags_gm3.cpp

/*
	ALICE SOFT SYSTEM 1 for Win32

	[ AGS - gm3 loader ]
*/

#include "ags.h"
#include <string.h>

void AGS::load_gm3(uint8* data, int page, int transparent)
{
	// ヘッダ取得
	uint16 tmp = (data[0x30] | (data[0x31] << 8)) - 0x8000;
	int sx = tmp % 80;
	int sy = tmp / 80;
	int width = data[0x32] | (data[0x33] << 8);
	int height = data[0x34] | (data[0x35] << 8);
	uint8 base = 0;

	// Jコマンドの処理
	if(set_cg_dest) {
		sx = cg_dest_x >> 3;
		sy = cg_dest_y;
		set_cg_dest = false;
	}

	// Zコマンドの処理
	if(palette_bank != -1) {
		base = (palette_bank & 0x0f) << 4;
	}

/*
	// パレット取得
	if(get_palette) {
		for(int i = 0; i < 16; i++) {
			uint32 b = data[i * 3 + 0] & 0xf;
			uint32 r = data[i * 3 + 1] & 0xf;
			uint32 g = data[i * 3 + 2] & 0xf;
			program_palette[base + i] = SETPALETTE16(r, g, b);
		}
	}

	// パレット展開
	if(extract_palette && extract_palette_cg[page]) {
		for(int i = 0; i < 16; i++) {
			screen_palette[base + i] = program_palette[base + i];
		}
	}
*/

	// GM3展開
	uint8 cgdata[3][80][3];
	int p = 0x36;
	memset(cgdata, 0, sizeof(cgdata));

	for(int y = 0; y < height; y++) {
		for(int pl = 0; pl < 3; pl++) {
			int x = 0;
			while(x < width) {
				uint8 d1 = data[p++];
				if(d1 == 0x0) {
					uint8 d2 = data[p++];
					if(d2 < 0x80) {
						uint8 d3 = data[p++];
						for(int i = 0; i < d2; i++) {
							cgdata[pl][x++][0] = d3;
						}
					} else {
						uint8 d3 = cgdata[pl][x + 1][2];
						for(int i = 0; i < d2 - 0x80; i++) {
							cgdata[pl][x++][0] = d3;
						}
					}
				} else if(d1 == 0x1) {
					cgdata[pl][x++][0] = data[p++];
				} else if(0x2 <= d1 && d1 <= 0x7) {
					uint8 d2 = data[p++];
					for(int i = 0; i < d1; i++) {
						cgdata[pl][x++][0] = d2;
					}
				} else if(0x8 <= d1 && d1 <= 0xd) {
					uint8 d2 = cgdata[pl][x + 1][2];
					for(int i = 0; i < d1 - 6; i++) {
						cgdata[pl][x++][0] = d2;
					}
				} else if(d1 == 0xe) {
					uint8 d2 = data[p++];
					for(int i = 0; i < d2; i++) {
						cgdata[pl][x][0] = cgdata[2][x][0];
						x++;
					}
				} else if(d1 == 0xf) {
					uint8 d2 = data[p++];
					if(d2 < 0x80) {
						for(int i = 0; i < d2; i++) {
							cgdata[pl][x][0] = cgdata[0][x][0];
							x++;
						}
					} else {
						for(int i = 0; i < d2 - 0x80; i++) {
							cgdata[pl][x][0] = cgdata[1][x][0];
							x++;
						}
					}
				} else {
					cgdata[pl][x++][0] = d1;
				}
			}
		}

		// VRAMに転送
		if(extract_cg) {
			for(int x = 0; x < width; x++) {
				for(int pl = 0; pl < 3; pl++) {
					cgdata[pl][x][2] = cgdata[pl][x][1];
					cgdata[pl][x][1] = cgdata[pl][x][0];
				}
				uint8 b0, b1, b2, c[8];
				b0 = cgdata[0][x][0];
				b1 = cgdata[1][x][0];
				b2 = cgdata[2][x][0];
				c[0] = ((b0 >> 7) & 1) | ((b1 >> 6) & 2) | ((b2 >> 5) & 4);
				c[1] = ((b0 >> 6) & 1) | ((b1 >> 5) & 2) | ((b2 >> 4) & 4);
				c[2] = ((b0 >> 5) & 1) | ((b1 >> 4) & 2) | ((b2 >> 3) & 4);
				c[3] = ((b0 >> 4) & 1) | ((b1 >> 3) & 2) | ((b2 >> 2) & 4);
				c[4] = ((b0 >> 3) & 1) | ((b1 >> 2) & 2) | ((b2 >> 1) & 4);
				c[5] = ((b0 >> 2) & 1) | ((b1 >> 1) & 2) | ((b2     ) & 4);
				c[6] = ((b0 >> 1) & 1) | ((b1     ) & 2) | ((b2 << 1) & 4);
				c[7] = ((b0     ) & 1) | ((b1 << 1) & 2) | ((b2 << 2) & 4);

				uint32* dest0 = &vram[dest_screen][(y + sy) * 2 + 0][(x + sx) * 8];
				uint32* dest1 = &vram[dest_screen][(y + sy) * 2 + 1][(x + sx) * 8];
				if(transparent == -1) {
					for(int i = 0; i < 8; i++) {
						dest0[i] = dest1[i] = c[i] | base;
					}
				} else {
					for(int i = 0; i < 8; i++) {
						if(c[i] != transparent) {
							dest0[i] = dest1[i] = c[i] | base;
						}
					}
				}
			}
		}
	}

	// 画面更新
	if(dest_screen == 0 && extract_cg) {
		draw_screen(sx * 8, sy * 2, width * 8, height * 2);
	}
}