amiga_cyberspace
view src/main.c @ 3:200e512488e4
reduced sky copperlist, works on emulator only apparently
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Thu, 27 Jul 2017 10:42:36 +0300 |
| parents | b98fa9b135ea |
| children | 12ec766e435c |
line source
1 #include <stdio.h>
2 #include <proto/exec.h>
3 #include <exec/memory.h>
4 #include "inttypes.h"
5 #include "copper.h"
6 #include "mouse.h"
7 #include "hwregs.h"
9 #define WIDTH 480
10 #define HEIGHT 128
12 #define BPLSIZE (WIDTH / 8 * HEIGHT)
13 #define MAX_HSCROLL (WIDTH - 320)
14 #define HMOD (MAX_HSCROLL / 8)
16 static uint16_t prev_intena, prev_intreq, prev_adkcon, prev_dmacon;
18 extern uint32_t backdrop;
19 extern uint32_t grid;
21 static uint32_t backdrop_addr = (uint32_t)&backdrop;
22 static uint32_t grid_addr = (uint32_t)&grid;
24 static uint16_t *grid_pal;
26 #define MAX_GRID_SHADES 6
27 static uint32_t *cplist_pal[MAX_GRID_SHADES];
29 #define MAX_SKY_SHADES 25
30 static uint16_t sky_color[][2] = {
31 {0, 0x204},
32 {2, 0x205},
33 {3, 0x305},
34 {4, 0x306},
35 {8, 0x307},
36 {10, 0x407},
37 {12, 0x408},
38 {18, 0x508},
39 {20, 0x509},
40 {26, 0x50a},
41 {28, 0x60a},
42 {30, 0x60b},
43 {38, 0x60c},
44 {46, 0x70c},
45 {52, 0x80c},
46 {58, 0x80d},
47 {62, 0x90d},
48 {68, 0xa0d},
49 {72, 0xb0d},
50 {74, 0xb0c},
51 {86, 0xc0c},
52 {94, 0xd0c},
53 {102, 0xd0b},
54 {116, 0xe0b},
55 {118, 0xe0a}
56 };
58 int init(void);
59 void cleanup(void);
60 void wait_vpos(int x);
61 void wait_vblank(void);
63 int main(void)
64 {
65 int i, j, x, y;
66 long frameno = 0;
67 uint16_t tmpcol;
68 uint16_t *cplptr;
70 if(init() == -1) {
71 return 1;
72 }
74 while(!mouse_state(&x, &y)) {
75 wait_vblank();
77 if((frameno++ & 1) == 0) {
78 tmpcol = grid_pal[7];
79 for(i=7; i>2; i--) {
80 grid_pal[i] = grid_pal[i - 1];
81 }
82 grid_pal[2] = tmpcol;
83 }
85 for(i=0; i<MAX_GRID_SHADES; i++) {
86 cplptr = (uint16_t*)cplist_pal[i];
87 for(j=1; j<8; j++) {
88 uint16_t r = ((grid_pal[j] & 0xf00) >> 8) * (i + 1) / MAX_GRID_SHADES;
89 uint16_t g = ((grid_pal[j] & 0xf0) >> 4) * (i + 1) / MAX_GRID_SHADES;
90 uint16_t b = (grid_pal[j] & 0xf) * (i + 1) / MAX_GRID_SHADES;
92 cplptr[1] = (r << 8) | (g << 4) | b;
93 cplptr += 2;
94 }
95 }
96 }
98 cleanup();
99 return 0;
100 }
102 int init(void)
103 {
104 int i, j, x, y, bit;
105 unsigned char *fbptr;
106 unsigned char tmp;
107 uint32_t grid_bpl0_addr, grid_bpl1_addr, grid_bpl2_addr;
109 Forbid();
111 /* initialize copper */
112 if(init_copper(0, 0) == -1) {
113 return -1;
114 }
116 prev_dmacon = REG_DMACONR;
117 REG_DMACON = CLRBITS(DMA_ALL);
119 prev_intena = REG_INTENAR;
120 REG_INTENA = SETBITS(INTEN_ALL);
122 prev_intreq = REG_INTREQR;
123 prev_adkcon = REG_ADKCONR;
125 REG_BPLCON0 = BPLCON0_COUNT(1) | BPLCON0_COLOR;
126 REG_BPLCON1 = 0; /* h-scroll */
127 REG_BPL1MOD = HMOD;
128 REG_BPL2MOD = HMOD;
129 REG_DIWSTART = 0x2981;
130 REG_DIWSTOP = 0x29c1;
131 REG_DDFSTART = 0x38;
132 REG_DDFSTOP = 0xd0;
134 grid_pal = (uint16_t*)(grid_addr + BPLSIZE * 3);
136 /* XXX +10 hardcoded temporary scroll to see the middle of the grid
137 * until we implement proper scrolling and parallax
138 */
139 grid_bpl0_addr = grid_addr + 10;
140 grid_bpl1_addr = grid_addr + BPLSIZE + 10;
141 grid_bpl2_addr = grid_addr + BPLSIZE * 2 + 10;
143 for(i=0; i<8; i++) {
144 REG_COLOR_PTR[i] = grid_pal[i];
145 }
147 wait_vblank();
148 add_copper(COPPER_MOVE(REGN_BPLCON0, BPLCON0_COUNT(1) | BPLCON0_COLOR));
149 add_copper(COPPER_MOVE(REGN_BPL1PTH, backdrop_addr >> 16));
150 add_copper(COPPER_MOVE(REGN_BPL1PTL, backdrop_addr));
152 add_copper(COPPER_MOVE(REGN_COLOR1, sky_color[0][1]));
154 for(i=0; i<MAX_SKY_SHADES; i++) {
155 add_copper(COPPER_VWAIT(sky_color[i][0]));
156 add_copper(COPPER_MOVE(REGN_COLOR1, sky_color[i][1]));
157 }
159 add_copper(COPPER_VWAIT(125));
160 add_copper(COPPER_MOVE(REGN_BPLCON0, BPLCON0_COLOR));
162 add_copper(COPPER_MOVE(REGN_BPL1PTH, grid_bpl0_addr >> 16));
163 add_copper(COPPER_MOVE(REGN_BPL1PTL, grid_bpl0_addr));
164 add_copper(COPPER_MOVE(REGN_BPL2PTH, grid_bpl1_addr >> 16));
165 add_copper(COPPER_MOVE(REGN_BPL2PTL, grid_bpl1_addr));
166 add_copper(COPPER_MOVE(REGN_BPL3PTH, grid_bpl2_addr >> 16));
167 add_copper(COPPER_MOVE(REGN_BPL3PTL, grid_bpl2_addr));
169 add_copper(COPPER_VWAIT(128));
170 add_copper(COPPER_MOVE(REGN_BPLCON0, BPLCON0_COUNT(3) | BPLCON0_COLOR));
172 add_copper(COPPER_MOVE(REGN_COLOR0, grid_pal[0]));
173 for(i=0; i<MAX_GRID_SHADES; i++) {
174 add_copper(COPPER_VWAIT(128 + i * 64 / MAX_GRID_SHADES));
175 cplist_pal[i] = copperlist_end; /* save this copperlist pointer */
176 for(j=1; j<8; j++) {
177 add_copper(COPPER_MOVE(REGN_COLOR(j), 0));
178 }
179 }
180 add_copper(COPPER_END);
182 REG_DMACON = SETBITS(DMA_BPL | DMA_COPPER | DMA_MASTER);
183 return 0;
184 }
186 void cleanup(void)
187 {
188 REG_DMACON = CLRBITS(DMA_ALL);
189 REG_DMACON = SETBITS(prev_dmacon);
191 REG_INTREQ = CLRBITS(0x7fff);
192 REG_INTREQ = SETBITS(prev_intreq);
194 REG_ADKCON = CLRBITS(0x7fff);
195 REG_ADKCON = SETBITS(prev_adkcon);
197 REG_INTENA = CLRBITS(INTEN_ALL);
198 REG_INTENA = SETBITS(prev_intena);
200 cleanup_copper();
201 Permit();
202 }
204 void wait_vpos(int x)
205 {
206 x <<= 8;
207 while((REG32_VPOSR & 0x1ff00) < x);
208 }
210 void wait_vblank(void)
211 {
212 wait_vpos(300);
213 }