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- //DSP-4 emulator code
- //Copyright (c) 2004-2006 Dreamer Nom, John Weidman, Kris Bleakley, Nach, z80 gaiden
- #ifndef DSP4EMU_H
- #define DSP4EMU_H
- #undef TRUE
- #undef FALSE
- #define TRUE true
- #define FALSE false
- struct DSP4_t
- {
- bool8 waiting4command;
- bool8 half_command;
- uint16 command;
- uint32 in_count;
- uint32 in_index;
- uint32 out_count;
- uint32 out_index;
- uint8 parameters[512];
- uint8 output[512];
- };
- extern struct DSP4_t DSP4;
- struct DSP4_vars_t
- {
- // op control
- int8 DSP4_Logic; // controls op flow
- // projection format
- int16 lcv; // loop-control variable
- int16 distance; // z-position into virtual world
- int16 raster; // current raster line
- int16 segments; // number of raster lines drawn
- // 1.15.16 or 1.15.0 [sign, integer, fraction]
- int32 world_x; // line of x-projection in world
- int32 world_y; // line of y-projection in world
- int32 world_dx; // projection line x-delta
- int32 world_dy; // projection line y-delta
- int16 world_ddx; // x-delta increment
- int16 world_ddy; // y-delta increment
- int32 world_xenv; // world x-shaping factor
- int16 world_yofs; // world y-vertical scroll
- int16 view_x1; // current viewer-x
- int16 view_y1; // current viewer-y
- int16 view_x2; // future viewer-x
- int16 view_y2; // future viewer-y
- int16 view_dx; // view x-delta factor
- int16 view_dy; // view y-delta factor
- int16 view_xofs1; // current viewer x-vertical scroll
- int16 view_yofs1; // current viewer y-vertical scroll
- int16 view_xofs2; // future viewer x-vertical scroll
- int16 view_yofs2; // future viewer y-vertical scroll
- int16 view_yofsenv; // y-scroll shaping factor
- int16 view_turnoff_x; // road turnoff data
- int16 view_turnoff_dx; // road turnoff delta factor
- // drawing area
- int16 viewport_cx; // x-center of viewport window
- int16 viewport_cy; // y-center of render window
- int16 viewport_left; // x-left of viewport
- int16 viewport_right; // x-right of viewport
- int16 viewport_top; // y-top of viewport
- int16 viewport_bottom; // y-bottom of viewport
- // sprite structure
- int16 sprite_x; // projected x-pos of sprite
- int16 sprite_y; // projected y-pos of sprite
- int16 sprite_attr; // obj attributes
- bool8 sprite_size; // sprite size: 8x8 or 16x16
- int16 sprite_clipy; // visible line to clip pixels off
- int16 sprite_count;
- // generic projection variables designed for
- // two solid polygons + two polygon sides
- int16 poly_clipLf[2][2]; // left clip boundary
- int16 poly_clipRt[2][2]; // right clip boundary
- int16 poly_ptr[2][2]; // HDMA structure pointers
- int16 poly_raster[2][2]; // current raster line below horizon
- int16 poly_top[2][2]; // top clip boundary
- int16 poly_bottom[2][2]; // bottom clip boundary
- int16 poly_cx[2][2]; // center for left/right points
- int16 poly_start[2]; // current projection points
- int16 poly_plane[2]; // previous z-plane distance
- // OAM
- int16 OAM_attr[16]; // OAM (size,MSB) data
- int16 OAM_index; // index into OAM table
- int16 OAM_bits; // offset into OAM table
- int16 OAM_RowMax; // maximum number of tiles per 8 aligned pixels (row)
- int16 OAM_Row[32]; // current number of tiles per row
- };
- extern struct DSP4_vars_t DSP4_vars;
- #endif
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