amiga_imgv

annotate src/amiga/gfx.c @ 5:0d3d7b020e6a

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author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 27 Oct 2017 12:32:24 +0300
parents 0fd37effde29
children ae0ada629b03
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <proto/exec.h>
nuclear@0 3 #include "gfx.h"
nuclear@0 4 #include "copper.h"
nuclear@0 5 #include "hwregs.h"
nuclear@0 6 #include "logger.h"
nuclear@4 7 #include "image.h"
nuclear@0 8
nuclear@0 9 static int scr_width, scr_height;
nuclear@0 10 static int fb_width, fb_height;
nuclear@0 11 static int num_bitplanes;
nuclear@0 12 static uint16_t prev_intena, prev_intreq, prev_adkcon, prev_dmacon;
nuclear@0 13
nuclear@0 14 static unsigned char *framebuf;
nuclear@0 15 static unsigned long fbsize;
nuclear@0 16 static int own_framebuf;
nuclear@0 17
nuclear@0 18 int gfx_init(int nbpl, unsigned int flags)
nuclear@0 19 {
nuclear@0 20 uint16_t bplcon0;
nuclear@0 21
nuclear@0 22 num_bitplanes = nbpl;
nuclear@0 23 scr_width = fb_width = (flags & GFX_HIRES) ? 640 : 320;
nuclear@0 24 scr_height = fb_height = (flags & GFX_ILACE) ? 512 : 256;
nuclear@0 25
nuclear@0 26 Forbid();
nuclear@0 27
nuclear@0 28 prev_dmacon = REG_DMACONR;
nuclear@0 29 REG_DMACON = CLRBITS(DMA_ALL);
nuclear@0 30
nuclear@0 31 prev_intena = REG_INTENAR;
nuclear@0 32 prev_intreq = REG_INTREQR;
nuclear@0 33 prev_adkcon = REG_ADKCONR;
nuclear@0 34
nuclear@0 35 if(init_copper(0, 0) == -1) {
nuclear@0 36 return -1;
nuclear@0 37 }
nuclear@0 38
nuclear@0 39 if(!gfx_set_framebuffer(0, scr_width, scr_height)) {
nuclear@0 40 gfx_shutdown();
nuclear@0 41 return -1;
nuclear@0 42 }
nuclear@0 43
nuclear@0 44 bplcon0 = BPLCON0_COUNT(nbpl) | BPLCON0_COLOR;
nuclear@0 45 if(flags & GFX_HIRES) bplcon0 |= BPLCON0_HIRES;
nuclear@0 46 if(flags & GFX_ILACE) bplcon0 |= BPLCON0_LACE;
nuclear@0 47 if(flags & GFX_HAM) bplcon0 |= BPLCON0_HOMOD;
nuclear@0 48 if(flags & GFX_DBLPF) bplcon0 |= BPLCON0_DBLPF;
nuclear@0 49
nuclear@0 50 REG_BPLCON0 = bplcon0;
nuclear@0 51 REG_BPLCON1 = 0; /* h-scroll */
nuclear@0 52 REG_DIWSTART = 0x2c81; /* 81h horiz start, 2ch vertical start */
nuclear@0 53 REG_DIWSTOP = 0x2cc1;
nuclear@0 54 REG_DDFSTART = (flags & GFX_HIRES) ? 0x3c : 0x38;
nuclear@0 55 REG_DDFSTOP = (flags & GFX_HIRES) ? 0xd4 : 0xd0;
nuclear@0 56
nuclear@0 57 gfx_wait_vblank();
nuclear@0 58 gfx_begin_copperlist();
nuclear@0 59 add_copper(COPPER_END);
nuclear@0 60
nuclear@3 61 logmsg("starting DMA\n");
nuclear@0 62 REG_DMACON = SETBITS(DMA_BPL | DMA_COPPER | DMA_MASTER);
nuclear@0 63 return 0;
nuclear@0 64 }
nuclear@0 65
nuclear@0 66 void gfx_shutdown(void)
nuclear@0 67 {
nuclear@0 68 REG_DMACON = CLRBITS(DMA_ALL);
nuclear@0 69 REG_DMACON = SETBITS(prev_dmacon);
nuclear@0 70
nuclear@0 71 REG_INTREQ = CLRBITS(0x7fff);
nuclear@0 72 REG_INTREQ = SETBITS(prev_intreq);
nuclear@0 73
nuclear@0 74 REG_ADKCON = CLRBITS(0x7fff);
nuclear@0 75 REG_ADKCON = SETBITS(prev_adkcon);
nuclear@0 76
nuclear@0 77 REG_INTENA = CLRBITS(INTEN_ALL);
nuclear@0 78 REG_INTENA = SETBITS(prev_intena);
nuclear@0 79
nuclear@0 80 if(framebuf && own_framebuf) {
nuclear@0 81 FreeMem(framebuf, fbsize);
nuclear@0 82 }
nuclear@0 83 framebuf = 0;
nuclear@0 84
nuclear@0 85 cleanup_copper();
nuclear@0 86 Permit();
nuclear@0 87 }
nuclear@0 88
nuclear@0 89 int gfx_screen_width(void)
nuclear@0 90 {
nuclear@0 91 return scr_width;
nuclear@0 92 }
nuclear@0 93
nuclear@0 94 int gfx_screen_height(void)
nuclear@0 95 {
nuclear@0 96 return scr_height;
nuclear@0 97 }
nuclear@0 98
nuclear@0 99 void *gfx_set_framebuffer(void *fb, int width, int height)
nuclear@0 100 {
nuclear@0 101 /*unsigned int bpl_scanline_sz = width / 8;*/
nuclear@0 102 unsigned long sz = width * height / 8 * num_bitplanes;
nuclear@0 103 uint32_t bpladdr;
nuclear@0 104 uint16_t bplmod;
nuclear@0 105
nuclear@0 106 if(framebuf && own_framebuf) {
nuclear@0 107 FreeMem(framebuf, fbsize);
nuclear@0 108 }
nuclear@0 109
nuclear@0 110 if(fb) {
nuclear@0 111 framebuf = fb;
nuclear@0 112 own_framebuf = 0;
nuclear@0 113 } else {
nuclear@0 114 if(!(framebuf = AllocMem(sz, MEMF_CHIP))) {
nuclear@0 115 logmsg("gfx_set_framebuffer failed to allocate %lu bytes of chip mem for framebuffer\n", sz);
nuclear@0 116 return 0;
nuclear@0 117 }
nuclear@0 118 own_framebuf = 1;
nuclear@0 119 }
nuclear@0 120
nuclear@0 121 fb_width = width;
nuclear@0 122 fb_height = height;
nuclear@0 123 fbsize = sz;
nuclear@0 124
nuclear@0 125 bpladdr = (uint32_t)framebuf;
nuclear@0 126 logmsg("bitplane address: %lx\n", (unsigned long)bpladdr);
nuclear@0 127
nuclear@4 128 bplmod = (fb_width - scr_width) / 8 + fb_width / 8 * (num_bitplanes - 1);
nuclear@0 129 REG_BPL1MOD = bplmod;
nuclear@0 130 REG_BPL2MOD = bplmod;
nuclear@0 131
nuclear@0 132 /*
nuclear@0 133 REG32_BPL1PT = bpladdr; bpladdr += bpl_scanline_sz;
nuclear@0 134 REG32_BPL2PT = bpladdr; bpladdr += bpl_scanline_sz;
nuclear@0 135 REG32_BPL3PT = bpladdr; bpladdr += bpl_scanline_sz;
nuclear@0 136 REG32_BPL4PT = bpladdr; bpladdr += bpl_scanline_sz;
nuclear@0 137 REG32_BPL5PT = bpladdr; bpladdr += bpl_scanline_sz;
nuclear@0 138 REG32_BPL6PT = bpladdr;
nuclear@0 139 */
nuclear@0 140 return framebuf;
nuclear@0 141 }
nuclear@0 142
nuclear@0 143 void *gfx_get_framebuffer(void)
nuclear@0 144 {
nuclear@0 145 return framebuf;
nuclear@0 146 }
nuclear@0 147
nuclear@0 148 int gfx_framebuffer_width(void)
nuclear@0 149 {
nuclear@0 150 return fb_width;
nuclear@0 151 }
nuclear@0 152
nuclear@0 153 int gfx_framebuffer_height(void)
nuclear@0 154 {
nuclear@0 155 return fb_height;
nuclear@0 156 }
nuclear@0 157
nuclear@0 158 void gfx_begin_copperlist(void)
nuclear@0 159 {
nuclear@0 160 static const uint16_t bplptr[] = {
nuclear@0 161 REGN_BPL1PTH, REGN_BPL2PTH, REGN_BPL3PTH, REGN_BPL4PTH, REGN_BPL5PTH, REGN_BPL6PTH
nuclear@0 162 };
nuclear@0 163 int i;
nuclear@0 164 uint32_t bpladdr;
nuclear@0 165 bpladdr = (uint32_t)framebuf;
nuclear@0 166
nuclear@0 167 for(i=0; i<num_bitplanes; i++) {
nuclear@0 168 add_copper(COPPER_MOVE(bplptr[i], bpladdr >> 16));
nuclear@0 169 add_copper(COPPER_MOVE(bplptr[i] + 2, bpladdr));
nuclear@5 170 bpladdr += fb_width / 8;
nuclear@0 171 }
nuclear@0 172 }
nuclear@0 173
nuclear@0 174 static int mouse_bnstate(void)
nuclear@0 175 {
nuclear@0 176 return (REG_CIAA_PORTA & CIAA_PA_FIR0) ? 0 : 1;
nuclear@0 177 }
nuclear@0 178
nuclear@0 179 int gfx_next_event(union gfx_event *ev, int block)
nuclear@0 180 {
nuclear@0 181 /* TODO */
nuclear@0 182 if(block) {
nuclear@0 183 while(!mouse_bnstate());
nuclear@0 184 ev->type = GFX_EV_QUIT;
nuclear@0 185 return 1;
nuclear@0 186 }
nuclear@0 187
nuclear@0 188 if(mouse_bnstate()) {
nuclear@0 189 ev->type = GFX_EV_QUIT;
nuclear@0 190 return 1;
nuclear@0 191 }
nuclear@0 192
nuclear@0 193 return 0;
nuclear@0 194 }
nuclear@0 195
nuclear@0 196 void gfx_wait_vpos(int x)
nuclear@0 197 {
nuclear@0 198 x <<= 8;
nuclear@0 199 while((REG32_VPOSR & 0x1ff00) < x);
nuclear@0 200 }
nuclear@0 201
nuclear@0 202 void gfx_wait_vblank(void)
nuclear@0 203 {
nuclear@0 204 gfx_wait_vpos(300);
nuclear@0 205 }
nuclear@3 206
nuclear@3 207 void gfx_show_image(struct ham_image *img)
nuclear@3 208 {
nuclear@4 209 int i, j, k, fbwidth, fbheight, ncolors, prev_line;
nuclear@4 210 unsigned char *fbptr = gfx_get_framebuffer();
nuclear@4 211 struct palchange *chg = img->chglist;
nuclear@4 212
nuclear@4 213 fbwidth = gfx_framebuffer_width();
nuclear@4 214 fbheight = gfx_framebuffer_height();
nuclear@4 215
nuclear@4 216 logmsg("showing ham image %dx%d\n", fbwidth, fbheight);
nuclear@4 217
nuclear@4 218 memcpy(fbptr, img->pixels, fbwidth * fbheight / 8 * num_bitplanes);
nuclear@4 219
nuclear@4 220 /* create copper list that handles the palette */
nuclear@4 221 clear_copper();
nuclear@4 222 gfx_begin_copperlist();
nuclear@4 223 /* initial palette at the start of frame */
nuclear@4 224 for(i=0; i<16; i++) {
nuclear@4 225 add_copper(COPPER_MOVE(REGN_COLOR(i), img->palette[i]));
nuclear@4 226 logmsg("copper palette[%d]: %x\n", i, (unsigned int)img->palette[i]);
nuclear@4 227 }
nuclear@4 228 #if 0
nuclear@4 229 /* add copper instructions for palette changes according to the image changelist */
nuclear@4 230 prev_line = -1;
nuclear@4 231 while(chg) {
nuclear@4 232 assert(chg->line >= prev_line);
nuclear@4 233 if(chg->line != prev_line) {
nuclear@4 234 prev_line = chg->line;
nuclear@4 235 add_copper(COPPER_VWAIT(chg->line));
nuclear@4 236 }
nuclear@4 237 add_copper(COPPER_MOVE(REGN_COLOR(chg->entry >> 12), chg->entry & 0xfff));
nuclear@4 238 }
nuclear@4 239 #endif
nuclear@4 240 add_copper(COPPER_END);
nuclear@3 241 }