tdkpin/original/reconstructed/tdkpin_mechanism_render.c

/* Five-target rotation and 91x90 panel compositor from TDKPIN Code1. */

#include "tdkpin_mechanism_render.h"

#include "tdkpin_sound.h"

typedef struct {
    INT16 x;
    INT16 y;
} TargetPoint;

static const TargetPoint g_target_positions[6][5] = {
    {{9, 41}, {23, 11}, {56, 14}, {63, 47}, {35, 63}},
    {{11, 45}, {18, 13}, {52, 11}, {63, 42}, {39, 64}},
    {{13, 50}, {15, 17}, {46, 9}, {64, 37}, {44, 62}},
    {{17, 55}, {11, 23}, {39, 7}, {64, 30}, {50, 59}},
    {{21, 60}, {9, 28}, {35, 7}, {62, 25}, {54, 56}},
    {{8, 35}, {26, 8}, {59, 18}, {59, 50}, {27, 61}},
};

static Win16FarPtr caller_receiver(uint16_t caller_bp)
{
    uint16_t offset = win16_read_stack_u16((uint16_t)(caller_bp + 6));
    uint16_t selector = win16_read_stack_u16((uint16_t)(caller_bp + 8));
    return win16_make_far_pointer(selector, offset);
}

static void rotate_target_state(uint16_t caller_bp, Win16FarPtr receiver)
{
    static const uint16_t record_words[5] = {
        0x3371, 0x33c4, 0x3417, 0x346a, 0x34bd};
    uint16_t first_word = win16_read_u16(
        win16_dgroup_pointer(record_words[0]));
    for (uint16_t index = 0; index < 4; index++) {
        win16_write_u16(
            win16_dgroup_pointer(record_words[index]),
            0,
            win16_read_u16(win16_dgroup_pointer(record_words[index + 1])));
    }
    win16_write_u16(
        win16_dgroup_pointer(record_words[4]), 0, first_word);

    uint16_t row = (uint16_t)(
        0x0476 + (uint16_t)g_current_player * 0x14u);
    uint8_t first_byte = win16_read_u8(
        win16_far_add_offset(receiver, row));
    for (uint16_t index = 0; index < 4; index++) {
        win16_write_u8(
            win16_far_add_offset(receiver, (uint16_t)(row + index)),
            win16_read_u8(win16_far_add_offset(
                receiver, (uint16_t)(row + index + 1))));
    }
    win16_write_u8(
        win16_far_add_offset(receiver, (uint16_t)(row + 4)), first_byte);
    for (uint16_t item = 15; item <= 19; item++) {
        tdkpin_refresh_player_item(caller_bp, item);
    }
}

/* 1000:6f27 -- render and optionally rotate the five-target panel. */
void tdkpin_rotate_and_draw_targets(uint16_t caller_bp)
{
    Win16FarPtr receiver = caller_receiver(caller_bp);
    HWND16 window = win16_read_u16(win16_far_add_offset(receiver, 4));
    HDC16 dc = GetDC16(window);
    HDC16 source_dc = CreateCompatibleDC16(dc);
    HDC16 panel_dc = CreateCompatibleDC16(dc);
    HBITMAP16 panel_bitmap = CreateCompatibleBitmap16(dc, 91, 90);
    HGDIOBJ16 old_source = SelectObject16(
        source_dc, win16_read_u16(win16_dgroup_pointer(0x0859)));
    HGDIOBJ16 old_panel = SelectObject16(panel_dc, panel_bitmap);
    int32_t state = (int32_t)win16_read_u32(win16_dgroup_pointer(0x0855));

    if (state < 6) {
        INT16 source_x = (INT16)(uint16_t)(
            ((uint32_t)state - 1u) * 91u);
        (void)BitBlt16(
            panel_dc, 0, 0, 91, 90,
            source_dc, source_x, 0, 0x00cc0020u);
    } else {
        (void)SelectObject16(
            source_dc, win16_read_u16(win16_dgroup_pointer(0x085d)));
        (void)BitBlt16(
            panel_dc, 0, 0, 91, 90,
            source_dc, 79, 33, 0x00cc0020u);
        (void)SelectObject16(
            source_dc, win16_read_u16(win16_dgroup_pointer(0x0859)));
        rotate_target_state(caller_bp, receiver);
    }

    if (state == 1) {
        tdkpin_play_sound_if_not_tilted(11);
    }
    if (state >= 1 && state <= 6) {
        static const uint16_t target_words[5] = {
            0x3371, 0x33c4, 0x3417, 0x346a, 0x34bd};
        const TargetPoint *positions = g_target_positions[state - 1];
        for (uint16_t index = 0; index < 5; index++) {
            if (win16_read_u16(
                    win16_dgroup_pointer(target_words[index])) != 0) {
                (void)BitBlt16(
                    panel_dc,
                    positions[index].x,
                    positions[index].y,
                    17,
                    17,
                    source_dc,
                    455,
                    17,
                    0x008800c6u);
                (void)BitBlt16(
                    panel_dc,
                    positions[index].x,
                    positions[index].y,
                    17,
                    17,
                    source_dc,
                    455,
                    0,
                    0x00ee0086u);
            }
        }
    }
    (void)BitBlt16(
        dc, 79, 33, 91, 90, panel_dc, 0, 0, 0x00cc0020u);
    (void)SelectObject16(source_dc, old_source);
    (void)SelectObject16(panel_dc, old_panel);
    (void)DeleteObject16(panel_bitmap);
    (void)DeleteDC16(panel_dc);
    (void)DeleteDC16(source_dc);
    (void)ReleaseDC16(window, dc);
}