-
Notifications
You must be signed in to change notification settings - Fork 0
/
graph.c
210 lines (174 loc) · 5.4 KB
/
graph.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
#include <string.h>
/* All screen blitting */
#include "bitbox.h"
#include "game.h"
char hud[20];
static void draw_hudline(const int x, const int y)
{
if ((vga_line-y)>=0 && (vga_line-y)<8) {
for (int i=0;i<20;i++) {
int chr=hud[i];
if (chr!=' ') {
chr = chr>='A' ? chr+256-'A' : chr-'0';
for (int dx=0;dx<8;dx++) {
uint8_t c=read_tile(0xF5, dx+chr*8, vga_line-y);
if (c!=TRANSPARENT)
draw_buffer[x+dx+i*8]=c;
}
}
}
}
}
void screen_line8(void)
{
// XXX handle x/y offset negative ?
// background draw
uint8_t tile_id;
int abs_y = (int)vga_line+camera_y;
if (abs_y<0) return;
// first tile (clipped)
tile_id = data[(abs_y/16)*IMAGE_WIDTH + camera_x/16];
memcpy(draw_buffer,
&data[(tile_id%16)*16 + // tile column
(tile_id/16)*16*IMAGE_WIDTH + // tile line
abs_y%16*IMAGE_WIDTH + // line offset
(camera_x)%16 // offset
],
(-camera_x)&15 // pos modulo
);
// TODO : check this tile of tilemap is inside level
// TODO : skip up to end of super tile (16 tiles) and draw once
// TODO : special cases ?
for (int tile=-camera_x%16?1:0;tile<VGA_H_PIXELS/16+1;tile++) {
// read tilemap
tile_id = data[ (abs_y/16)*IMAGE_WIDTH + tile + camera_x/16];
memcpy(draw_buffer+tile*16 - camera_x%16 ,
&data[((tile_id/16)*16 + abs_y%16)*IMAGE_WIDTH + // tile line + line ofs
(tile_id%16)*16] // tile column
,16);
}
// draw all sprites
for (int spr_id=MAX_SPRITES-1;spr_id>=0;spr_id--) { // reverse order for draw priority
struct Sprite *spr=&sprite[spr_id];
if (spr->type>=SPRITE_INACTIVE || spr->type==SPRITE_FREE)
continue;
struct SpriteType *spt=&sprtype[spr->type];
if ( abs_y >= spr->y/256 && \
abs_y < spr->y/256 + spt->h)
{
int start = spr->x/256-camera_x>=0 ? 0:camera_x-spr->x/256;
int end = spr->x/256+spt->w-camera_x<320 ? spt->w : 320+camera_x-spr->x/256;
// TODO start / end are frame-based, avoid recompute ?
for (int i=start;i<end;i++) { // TODO w=16,32,48. use it!
uint8_t c=data[
(spt->y+vga_line-spr->y/256+camera_y)*IMAGE_WIDTH+\
spt->x + (spr->hflip?spt->w-1-i:i) + spr->frame*spt->w
];
if (c != TRANSPARENT) {
draw_buffer[spr->x/256-camera_x+i]=c;
}
}
}
}
// TODO return sprites to position if out / killed
// HUD line
draw_hudline(64,8);
}
#define TITLE_OFS_Y 40
#define TITLE_OFS_X 32
static inline void _draw_tiles_title(const int ofs, const int abs_y, const int darken) {
for (int tile=0;tile<16;tile++) {
// read tilemap
uint8_t tile_id = data[ (abs_y/16+TILE_TITLE_Y*16)*IMAGE_WIDTH + tile + TILE_TITLE_X*16];
memcpy(ofs + draw_buffer +tile*16 ,
&data[((tile_id/16)*16 + abs_y%16)*IMAGE_WIDTH + // tile line + line ofs
(tile_id%16)*16] // tile column
,16);
}
// "a bit" darker
if (darken==1)
for (int i=ofs;i<ofs+16*16;i++)
draw_buffer[i]&=0b01101011;
// l/r borders
for (int i=0;i<ofs;i++)
draw_buffer[i]=0;
for (int i=ofs+16*16;i<VGA_H_PIXELS;i++)
draw_buffer[i]=0;
}
void title_line8(void)
{
int ofs, darken, abs_y;
// background draw only, with effects
if ((vga_line>=TITLE_OFS_Y) && (vga_line<TITLE_OFS_Y+TITLE_HEIGHT*3/2)) {
if (vga_line<TITLE_OFS_Y+TITLE_HEIGHT) {
ofs=0;
abs_y = vga_line-TITLE_OFS_Y;
darken=0;
} else {
int phi = (2*vga_frame+8*vga_line)%256;
ofs = sine(phi) * ((int)vga_line-TITLE_OFS_Y-TITLE_HEIGHT)/(16*64);
abs_y = TITLE_HEIGHT-1-(int)(vga_line-TITLE_OFS_Y-TITLE_HEIGHT)*2;
darken=1;
}
ofs += TITLE_OFS_X;
// speedups if inlined + special cased
switch(ofs&3) {
case 0: _draw_tiles_title(ofs,abs_y,darken); break;
case 1: _draw_tiles_title(ofs,abs_y,darken); break;
case 2: _draw_tiles_title(ofs,abs_y,darken); break;
case 3: _draw_tiles_title(ofs,abs_y,darken); break;
}
} else {
memset(draw_buffer,0,VGA_H_PIXELS);
}
}
#define LEVELTITLE_OFS_X ((320-8*16)/2)
void leveltitle_line8(void)
{
const int abs_y=vga_line-camera_y;
if (abs_y<0 || abs_y>=4*16) {
memset(draw_buffer,0,VGA_H_PIXELS);
// top/bottom borders
if (abs_y==4*16+1 || abs_y ==-2 ) {
memset(draw_buffer+LEVELTITLE_OFS_X,0xff,8*16);
} else if (abs_y==4*16 || abs_y ==-1) {
draw_buffer [LEVELTITLE_OFS_X-1] = draw_buffer[LEVELTITLE_OFS_X+16*8]=0xff;
}
} else {
for (int tile=0;tile<8;tile++) {
// read tilemap
uint8_t tile_id = data[ (8+(level/2)*4+abs_y/16+TILE_TITLE_Y*16)*IMAGE_WIDTH + tile + TILE_TITLE_X*16+(level%2)*8];
memcpy(LEVELTITLE_OFS_X + draw_buffer + tile*16 ,
&data[((tile_id/16)*16 + abs_y%16 )*IMAGE_WIDTH + // tile line + line ofs
(tile_id%16)*16] // tile column
,16);
}
// black left and right
for (int i=0;i<LEVELTITLE_OFS_X;i++) draw_buffer[i]=0;
for (int i=LEVELTITLE_OFS_X+8*16;i<VGA_H_PIXELS;i++) draw_buffer[i]=0;
// LR border
draw_buffer [LEVELTITLE_OFS_X-2] =0xff;
draw_buffer [LEVELTITLE_OFS_X+16*8+1]=0xff;
}
draw_hudline(LEVELTITLE_OFS_X+10,64);
}
// used to detect if we need to draw title (intro ?)
void graph_line()
{
if (vga_odd)
return;
if (frame_handler==frame_error)
memset(draw_buffer,RGB(0,0,70),VGA_H_PIXELS);
else if (frame_handler==frame_play || frame_handler==frame_die)
screen_line8();
else if (frame_handler==frame_title)
title_line8();
else if (frame_handler==frame_leveltitle)
leveltitle_line8();
else if (frame_handler==0)
memset(draw_buffer,RGB(70,0,70),VGA_H_PIXELS);
else {
message("!!! error unknown frame type \n");
die(8,4);
}
}