mirror of https://github.com/nmlgc/ReC98.git
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
#ifndef TH04_MAIN_PLAYFLD_HPP
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#define TH04_MAIN_PLAYFLD_HPP
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#include "th04/main/scroll.hpp"
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#include "th04/math/motion.hpp"
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#include "th02/main/playfld.hpp"
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struct PlayfieldPoint : public SPPoint {
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screen_x_t to_screen_left(pixel_t sprite_w_if_centered = 0) const {
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return playfield_to_screen_left(x, sprite_w_if_centered);
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}
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screen_y_t to_screen_top(pixel_t sprite_h_if_centered = 0) const {
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return playfield_to_screen_top(y, sprite_h_if_centered);
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}
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vram_y_t to_vram_top_scrolled_seg1(pixel_t sprite_h_if_centered) const {
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return scroll_subpixel_y_to_vram_seg1(
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y + (PLAYFIELD_TOP - (sprite_h_if_centered / 2))
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);
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}
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vram_y_t to_vram_top_scrolled_seg3(pixel_t sprite_h_if_centered) const {
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return scroll_subpixel_y_to_vram_seg3(
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y + (PLAYFIELD_TOP - (sprite_h_if_centered / 2))
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);
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}
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};
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struct PlayfieldMotion : public MotionBase<PlayfieldPoint> {
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// Moves by one step, and returns the new current position.
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// The _seg1() and _seg3() variants are provided for near calls within
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// code segment #1 (rendering) and code segment #3 (update),
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// respectively.
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// Note that some calls to these functions directly access the returned
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// value through the AX (X) and DX (Y) registers.
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PlayfieldPoint pascal near update_seg1();
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PlayfieldPoint pascal near update_seg3();
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};
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/// Shaking
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/// -------
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// Shake amount for the current frame; resets to 0 after calling
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// playfield_shake_update_and_render(). Can also be manually controlled while
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// [playfield_shake_anim_time] is 0.
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extern pixel_t playfield_shake_x;
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extern pixel_t playfield_shake_y;
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// Frames left in the 4-direction shake animation.
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extern int playfield_shake_anim_time;
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// Shifts the playfield on the current VRAM page by [playfield_shake], or runs
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// the 4-direction shake animation if it's active. After the playfield was
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// shifted, all tiles are invalidated for the next two frames, forcing a
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// redraw of the unshifted playfield on both VRAM pages.
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void near playfield_shake_update_and_render(void);
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/// -------
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#endif /* TH04_MAIN_PLAYFLD_HPP */
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