git.mutantstargoat.com Git - gba_blender/blob - src/main.c

   1 /*
   2 blender for the Gameboy Advance
   3 Copyright (C) 2021  John Tsiombikas <nuclear@member.fsf.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <https://www.gnu.org/licenses/>.
  17 */
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include "gbaregs.h"
  21 #include "timer.h"
  22 #include "keyb.h"
  23 #include "intr.h"
  24 #include "gfx.h"
  25 #include "xgl.h"
  26 #include "polyfill.h"
  27 #include "debug.h"
  28 #include "meshdata.h"
  29 #include "sprites.h"
  30 #include "dma.h"
  31
  32 enum {
  33         SIDX_DEL0, SIDX_DEL1, SIDX_DEL2,
  34         SIDX_TIME,
  35         SIDX_ICONS_BASE
  36 };
  37
  38 #define SNAM_START      512
  39 enum {
  40         SNAM_DEL0               = SNAM_START,
  41         SNAM_DEL1               = SNAM_DEL0 + 8,
  42         SNAM_DEL2               = SNAM_DEL1 + 8,
  43         SNAM_ICON_ZOOM  = SNAM_START + 24,
  44         SNAM_ICON_PAN   = SNAM_ICON_ZOOM + 4,
  45         SNAM_ICON_ORBIT = SNAM_START + 32 * 4 + 24,     /* for tiles down, 24 across */
  46         SNAM_ICON_X             = SNAM_START + 32 * 8 + 26,
  47         SNAM_ICON_Y             = SNAM_ICON_X + 2,
  48         SNAM_ICON_Z             = SNAM_ICON_Y + 2
  49 };
  50
  51 #define MENU_HEIGHT             17
  52 #define TRACK_HEIGHT    18
  53 #define VP_HEIGHT               (160 - MENU_HEIGHT - TRACK_HEIGHT)
  54
  55 static void handle_keys(void);
  56 static void show_msgbox(int en);
  57
  58 extern struct { unsigned char r, g, b; } bgimg_cmap[];
  59 extern unsigned char bgimg_pixels[];
  60
  61 static int32_t cam_theta = 0x10000, cam_phi = -0x8000;
  62
  63 static int show_obj = 1, show_del;
  64
  65 #define AXIS0   0x10000
  66 #define AXIS1   0x80000
  67
  68 static struct xvertex gridaxes[] = {
  69         {AXIS0, 0, 0,   0, 0, 0, 92},
  70         {AXIS1, 0, 0,   0, 0, 0, 92},
  71         {-AXIS0, 0, 0,  0, 0, 0, 92},
  72         {-AXIS1, 0, 0,  0, 0, 0, 92},
  73         {0, 0, AXIS0,   0, 0, 0, 93},
  74         {0, 0, AXIS1,   0, 0, 0, 93},
  75         {0, 0, -AXIS0,  0, 0, 0, 93},
  76         {0, 0, -AXIS1,  0, 0, 0, 93},
  77
  78         {0, 0, 0,               0, 0, 0, 92},
  79         {AXIS1, 0, 0,   0, 0, 0, 92},
  80         {0, 0, 0,               0, 0, 0, 92},
  81         {-AXIS1, 0, 0,  0, 0, 0, 92},
  82         {0, 0, 0,               0, 0, 0, 93},
  83         {0, 0, AXIS1,   0, 0, 0, 93},
  84         {0, 0, -0,              0, 0, 0, 93},
  85         {0, 0, -AXIS1,  0, 0, 0, 93},
  86 };
  87
  88 #define MAX_SIDX        8
  89 static uint16_t oam[4 * MAX_SIDX];
  90
  91
  92 int main(void)
  93 {
  94         int i;
  95         unsigned int nframes = 0, backbuf;
  96         uint16_t *cptr;
  97         unsigned char r, g, b;
  98         unsigned char *fbptr[2], *fb;
  99
 100         intr_init();
 101         reset_msec_timer();
 102         set_intr();
 103
 104         /* mode 4: 240x160 8bpp */
 105         REG_DISPCNT = DISPCNT_BG2 | DISPCNT_OBJ | 4;
 106
 107         fbptr[0] = (unsigned char*)VRAM_LFB_FB0_ADDR;
 108         fbptr[1] = (unsigned char*)VRAM_LFB_FB1_ADDR;
 109
 110         set_bg_color(0xff, 31, 31, 31);
 111
 112         cptr = (uint16_t*)CRAM_BG_ADDR;
 113         for(i=0; i<128; i++) {
 114                 r = bgimg_cmap[i].r >> 3;
 115                 g = bgimg_cmap[i].g >> 3;
 116                 b = bgimg_cmap[i].b >> 3;
 117                 *cptr++ = r | (g << 5) | (b << 10);
 118         }
 119         for(i=0; i<128; i++) {
 120                 r = i / 5 + 6;
 121                 *cptr++ = r | (r << 5) | (r << 10);
 122         }
 123         dma_copy16(3, fbptr[0], bgimg_pixels, 240 * 160 / 2, 0);
 124         dma_copy16(3, fbptr[1], bgimg_pixels, 240 * 160 / 2, 0);
 125
 126         init_sprites();
 127         REG_BLDCNT = BLDCNT_ALPHA | BLDCNT_B_BG2;
 128         REG_BLDALPHA = 0x040c;
 129
 130         set_sprite(oam, SIDX_ICONS_BASE, SNAM_ICON_ZOOM, 213, 57, 4, SPR_SZ32);
 131         set_sprite(oam, SIDX_ICONS_BASE + 1, SNAM_ICON_PAN, 213, 81, 4, SPR_SZ32);
 132         set_sprite(oam, SIDX_ICONS_BASE + 2, SNAM_ICON_ORBIT, 213, 103, 4, SPR_SZ32);
 133
 134         xgl_init();
 135         xgl_viewport(0, 0, 240, VP_HEIGHT);
 136         xgl_enable(XGL_LIGHTING);
 137
 138         key_repeat(75, 75, KEY_LEFT | KEY_RIGHT | KEY_DOWN | KEY_UP);
 139
 140         /* every vblank, copy the shadow OAM automatically */
 141         /*dma_copy16(3, (void*)OAM_ADDR, oam, sizeof oam / 2, DMACNT_VBLANK |
 142                         DMACNT_REPEAT | DMACNT_INC_RELOAD);*/
 143
 144         for(;;) {
 145                 handle_keys();
 146
 147                 backbuf = ++nframes & 1;
 148
 149                 fb = fbptr[backbuf] + 240 * MENU_HEIGHT;
 150                 polyfill_framebuffer(fb, 240, VP_HEIGHT);
 151                 //memset(fb, 14, 240 * VP_HEIGHT);
 152                 dma_fill16(3, fb, 0x0e0e, 240 * VP_HEIGHT / 2);
 153
 154                 xgl_load_identity();
 155                 xgl_translate(0, 0, 8 << 16);
 156                 xgl_rotate_x(cam_phi);
 157                 xgl_rotate_y(cam_theta);
 158
 159                 if(show_obj) {
 160                         if(cam_theta < X_PI) {
 161                                 xgl_draw(XGL_LINES, gridaxes + 2, 2);   /* -X */
 162                         } else {
 163                                 xgl_draw(XGL_LINES, gridaxes, 2);               /* +X */
 164                         }
 165                         if(cam_theta < X_HPI || cam_theta > (3 * X_HPI)) {
 166                                 xgl_draw(XGL_LINES, gridaxes + 4, 2);   /* +Z */
 167                         } else {
 168                                 xgl_draw(XGL_LINES, gridaxes + 6, 2);   /* -Z */
 169                         }
 170                         if(show_obj == 1) {
 171                                 xgl_draw(XGL_QUADS, cube, sizeof cube / sizeof *cube);
 172                         } else {
 173                                 xgl_draw(XGL_TRIANGLES, suzanne, sizeof suzanne / sizeof *suzanne);
 174                         }
 175                         if(cam_theta < X_PI) {
 176                                 xgl_draw(XGL_LINES, gridaxes, 2);               /* +X */
 177                         } else {
 178                                 xgl_draw(XGL_LINES, gridaxes + 2, 2);   /* -X */
 179                         }
 180                         if(cam_theta < X_HPI || cam_theta > (3 * X_HPI)) {
 181                                 xgl_draw(XGL_LINES, gridaxes + 6, 2);   /* -Z */
 182                         } else {
 183                                 xgl_draw(XGL_LINES, gridaxes + 4, 2);   /* +Z */
 184                         }
 185                 } else {
 186                         xgl_draw(XGL_LINES, gridaxes + 8, 8);
 187                 }
 188
 189                 wait_vblank();
 190                 present(backbuf);
 191                 dma_copy16(3, (void*)OAM_ADDR, oam, sizeof oam / 2, 0);
 192         }
 193
 194         return 0;
 195 }
 196
 197 static void handle_keys(void)
 198 {
 199         update_keyb();
 200
 201         if(KEYPRESS(KEY_UP)) {
 202                 cam_phi += 0x2000;
 203                 if(cam_phi > X_HPI) cam_phi = X_HPI;
 204         }
 205         if(KEYPRESS(KEY_DOWN)) {
 206                 cam_phi -= 0x2000;
 207                 if(cam_phi < -X_HPI) cam_phi = -X_HPI;
 208         }
 209         if(KEYPRESS(KEY_LEFT)) {
 210                 cam_theta += 0x2000;
 211                 if(cam_theta > X_2PI) cam_theta -= X_2PI;
 212         }
 213         if(KEYPRESS(KEY_RIGHT)) {
 214                 cam_theta -= 0x2000;
 215                 if(cam_theta < 0) cam_theta += X_2PI;
 216         }
 217         if(KEYPRESS(KEY_RT)) {
 218                 if(++show_obj > 2) show_obj = 0;
 219         }
 220         if(KEYPRESS(KEY_LT)) {
 221                 if(--show_obj < 0) show_obj = 2;
 222         }
 223
 224         if(KEYPRESS(KEY_A)) {
 225                 if(!show_del) {
 226                         if(show_obj) show_del = 1;
 227                 } else {
 228                         show_del = 0;
 229                 }
 230                 show_msgbox(show_del);
 231         }
 232         if(KEYPRESS(KEY_B)) {
 233                 if(show_del) {
 234                         show_obj = 0;
 235                         show_del = 0;
 236                         show_msgbox(0);
 237                 }
 238         }
 239 }
 240
 241 static void show_msgbox(int en)
 242 {
 243         int i;
 244
 245         if(en) {
 246                 for(i=0; i<3; i++) {
 247                         set_sprite(oam, SIDX_DEL0 + i, SNAM_DEL0 + i * 8, 42 + i * 64, 50, 0,
 248                                         SPR_SZ64 | SPR_BLEND);
 249                 }
 250         } else {
 251                 for(i=0; i<3; i++) {
 252                         set_sprite(oam, SIDX_DEL0 + i, 0, 0, 0, 0, 0);
 253                 }
 254         }
 255 }