mirror of https://github.com/nmlgc/ReC98.git
61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
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#include "th02/main/tile.hpp"
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// No idea why ZUN just didn't go with the actually visible space of 384
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// horizontal tiles. That's 8 wasted tiles per row that the game doesn't do
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// anything with?
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#define TILES_MEMORY_X (512 / TILE_W)
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// TH04 starts addressing individual tiles directly via their 16-bit offset
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// in the VRAM.
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extern uint16_t tile_ring[TILES_Y][TILES_MEMORY_X];
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// Blits all tiles in the ring buffer to the playfield in VRAM.
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void pascal near tiles_render_all(void);
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/// Redraw
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/// ------
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// Subdivides each 16×16 tile into two 16×8 halves and marks whether that half
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// should be redrawn by the next call to tiles_redraw_invalidated() if its
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// entry is nonzero.
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extern bool halftiles_dirty[TILE_FLAGS_Y][TILES_MEMORY_X];
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void pascal near tiles_invalidate_reset(void);
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void pascal near tiles_invalidate_all(void);
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// ---------------------------------------------------------------------------
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// tiles_invalidate_around() marks all stage background tiles for redrawing
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// that lie in the area covered by [tile_invalidate_box] around [center].
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// Inconsistencies in the originally generated code revealed that ZUN must
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// have used at least two different parameter lists for the same function. To
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// use it, the respective prototype has to be declared separately in each
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// translation unit, depending on the expected code generation:
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//
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// • Passing separate X and Y coordinates (including hardcoded constants
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// combined to form a single 32-bit immediate via the -3 compiler option):
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//
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// void pascal near tiles_invalidate_around(
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// subpixel_t center_y, subpixel_t center_x
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// );
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//
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// Use the tiles_invalidate_around_xy() macro declared below for a more
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// natural parameter order. (Yes, Borland/Turbo C++ only supports __stdcall
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// for Windows targets.)
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//
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// • Passing SPPoint instances:
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//
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// void pascal near tiles_invalidate_around(const SPPoint center);
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#define tiles_invalidate_around_xy(center_x, center_y) \
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tiles_invalidate_around(center_y, center_x)
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#define tiles_invalidate_around_vram_xy(center_x, center_y) \
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tiles_invalidate_around_xy(to_sp(center_x), to_sp(center_y))
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// ---------------------------------------------------------------------------
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// Width and height, in screen pixels, of a box around the center passed to
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// tiles_invalidate_around(). *Not* the radius.
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extern Point tile_invalidate_box;
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void pascal near tiles_redraw_invalidated(void);
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/// ------
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