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1.1 root 1: /*
2: * Data used for communication between custom.c and drawing.c.
3: *
4: * Copyright 1996-1998 Bernd Schmidt
5: */
6:
7: #define SMART_UPDATE 1
8:
9: #ifdef SUPPORT_PENGUINS
10: #undef SMART_UPDATE
11: #define SMART_UPDATE 1
12: #endif
13:
14: /*
15: * Several people have tried this define, with not much success. Turning on
16: * AGA garbles the screen. A place you could start looking is the calcdiw()
17: * function - the AGA timing parameters are different, and apparently I
18: * haven't figured out the correct formula yet. Pity, the current one looks
19: * logical.
20: *
21: * @@@ Probably won't compile in this version.
22: */
23:
24: /* #define EMULATE_AGA */
25:
26: #ifndef EMULATE_AGA
27: #define AGA_CHIPSET 0
28: #else
29: #define AGA_CHIPSET 1
30: #endif
31:
32: #if AGA_CHIPSET == 1
33: #define MAX_PLANES 8
34: #else
35: #define MAX_PLANES 6
36: #endif
37:
38: /* We ignore that many lores pixels at the start of the display. These are
39: * invisible anyway due to hardware DDF limits. */
40: #define DISPLAY_LEFT_SHIFT 0x38
41: #define PIXEL_XPOS(HPOS) (((HPOS)*2 - DISPLAY_LEFT_SHIFT) << lores_shift)
42:
43: /* @@@ Is maxhpos + 4 - 1 correct? (4 less isn't enough) */
44: #define max_diwlastword (PIXEL_XPOS(maxhpos + 4 -1))
45:
46: extern int lores_factor, lores_shift, sprite_width;
47:
48: static __inline__ int coord_hw_to_native_x (int x)
49: {
50: x -= DISPLAY_LEFT_SHIFT;
51: return x << lores_shift;
52: }
53:
54: extern int framecnt;
55:
56: struct color_entry {
57: #if AGA_CHIPSET == 0
58: /* X86.S expects this at the start of the structure. */
59: xcolnr acolors[32];
60: uae_u16 color_regs[32];
61: #else
62: uae_u32 color_regs[256];
63: #endif
64: };
65:
66: /*
67: * The idea behind this code is that at some point during each horizontal
68: * line, we decide how to draw this line. There are many more-or-less
69: * independent decisions, each of which can be taken at a different horizontal
70: * position.
71: * Sprites, color changes and bitplane delay changes are handled specially:
72: * There isn't a single decision, but a list of structures containing
73: * information on how to draw the line.
74: */
75:
76: struct color_change {
77: int linepos;
78: int regno;
79: unsigned long value;
80: };
81:
82: struct sprite_draw {
83: int linepos;
84: int num;
85: int ctl;
86: uae_u32 datab;
87: };
88:
89: struct delay_change {
90: int linepos;
91: unsigned int value;
92: };
93:
94: /* Way too much... */
95: #define MAX_REG_CHANGE ((maxvpos+1) * 2 * maxhpos)
96:
97: #ifdef OS_WITHOUT_MEMORY_MANAGEMENT
98: extern struct sprite_draw *sprite_positions[2];
99: extern struct color_change *color_changes[2];
100: extern struct delay_change *delay_changes;
101: #else
102: extern struct sprite_draw sprite_positions[2][MAX_REG_CHANGE];
103: extern struct color_change color_changes[2][MAX_REG_CHANGE];
104: /* We don't remember those across frames, that would be too much effort.
105: * We simply redraw the line whenever we see one of these. */
106: extern struct delay_change delay_changes[MAX_REG_CHANGE];
107: #endif
108:
109: extern struct color_entry color_tables[2][(maxvpos+1) * 2];
110: extern struct color_entry *curr_color_tables, *prev_color_tables;
111:
112: extern struct sprite_draw *curr_sprite_positions, *prev_sprite_positions;
113: extern struct color_change *curr_color_changes, *prev_color_changes;
114: extern struct draw_info *curr_drawinfo, *prev_drawinfo;
115:
116: /* struct decision contains things we save across drawing frames for
117: * comparison (smart update stuff). */
118: struct decision {
119: unsigned long color0;
120: int which;
121: int plfstrt, plflinelen;
122: /* Display window: native coordinates, depend on lores state. */
123: int diwfirstword, diwlastword;
124: int ctable;
125:
126: uae_u16 bplcon0, bplcon1, bplcon2;
127: #if 0 /* We don't need this. */
128: uae_u16 bplcon3;
129: #endif
130: #if AGA_CHIPSET == 1
131: uae_u16 bplcon4;
132: #endif
133: };
134:
135: /* Anything related to changes in hw registers during the DDF for one
136: * line. */
137: struct draw_info {
138: int first_sprite_draw, last_sprite_draw;
139: int first_color_change, last_color_change;
140: int first_delay_change, last_delay_change;
141: int nr_color_changes, nr_sprites;
142: };
143:
144: extern struct decision line_decisions[2 * (maxvpos+1) + 1];
145: extern struct draw_info line_drawinfo[2][2 * (maxvpos+1) + 1];
146: extern char line_changed[2 * (maxvpos+1)];
147:
148: extern uae_u8 line_data[(maxvpos+1) * 2][MAX_PLANES * MAX_WORDS_PER_LINE * 2];
149:
150: /* Functions in drawing.c. */
151: extern int coord_native_to_amiga_y (int);
152: extern int coord_native_to_amiga_x (int);
153:
154: extern void record_diw_line (int first, int last);
155: extern void hardware_line_completed (int lineno);
156:
157: /* Determine how to draw a scan line. */
158: enum nln_how {
159: /* All lines on a non-doubled display. */
160: nln_normal,
161: /* Non-interlace, doubled display. */
162: nln_doubled,
163: /* Interlace, doubled display, upper line. */
164: nln_upper,
165: /* Interlace, doubled display, lower line. */
166: nln_lower
167: };
168:
169: extern void hsync_record_line_state (int lineno, enum nln_how);
170: extern void vsync_handle_redraw (int long_frame, int lof_changed);
171: extern void init_hardware_for_drawing_frame (void);
172: extern void finish_drawing_frame (void);
173: extern void reset_drawing (void);
174: extern void drawing_init (void);
175: extern void notice_interlace_seen (void);
176:
177: /* Finally, stuff that shouldn't really be shared. */
178:
179: extern int thisframe_first_drawn_line, thisframe_last_drawn_line;
180: extern uae_u16 clxdat, clxcon;
181: extern int clx_sprmask;
182: extern int diwfirstword,diwlastword;
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