git.mutantstargoat.com Git - rpikern/blob - src/video.c

   1 #include "config.h"
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <stdint.h>
   5 #include "rpi.h"
   6 #include "video.h"
   7 #include "mem.h"
   8 #include "debug.h"
   9 #include "sysctl.h"
  10
  11 static void *fb_pixels;
  12 static int scr_width, scr_height;
  13 static int fb_width, fb_height, fb_depth, fb_size, fb_pitch;
  14 static int fb_xoffs, fb_yoffs;
  15
  16 int video_init(void)
  17 {
  18         int i, j;
  19         struct rpi_prop *prop;
  20         uint32_t *fbptr;
  21
  22         scr_width = 1024;
  23         scr_height = 576;
  24         /*fb_width = 1920;
  25         fb_height = 1024;*/
  26         fb_width = scr_width;
  27         fb_height = scr_height;
  28         fb_depth = 32;
  29
  30         printf("Requesting video mode: %dx%d %d bpp (fb:%dx%d)\n", scr_width, scr_height,
  31                         fb_depth, fb_width, fb_height);
  32
  33         rpi_prop(RPI_TAG_ALLOCFB, 16);
  34         rpi_prop(RPI_TAG_SETFBVIRT, scr_width, scr_height);
  35         rpi_prop(RPI_TAG_SETFBPHYS, fb_width, fb_height);
  36         rpi_prop(RPI_TAG_SETFBDEPTH, fb_depth);
  37
  38         rpi_prop_send();
  39
  40         while((prop = rpi_prop_next())) {
  41                 switch(prop->id) {
  42                 case RPI_TAG_SETFBPHYS:
  43                         fb_width = prop->data[0];
  44                         fb_height = prop->data[1];
  45                         break;
  46
  47                 case RPI_TAG_SETFBVIRT:
  48                         scr_width = prop->data[0];
  49                         scr_height = prop->data[1];
  50                         break;
  51
  52                 case RPI_TAG_SETFBDEPTH:
  53                         fb_depth = prop->data[0];
  54                         break;
  55
  56                 case RPI_TAG_ALLOCFB:
  57                         fb_pixels = (void*)(prop->data[0] & 0x3fffffff);
  58                         fb_size = prop->data[1];
  59                         break;
  60
  61                 default:
  62                         break;
  63                 }
  64         }
  65
  66         if(!fb_pixels) {
  67                 rpi_prop(RPI_TAG_ALLOCFB, 16);
  68                 if(rpi_prop_send() == -1 || !(prop = rpi_prop_find(RPI_TAG_ALLOCFB))) {
  69                         printf("Failed to allocate framebuffer\n");
  70                         return -1;
  71                 }
  72                 fb_pixels = (void*)(prop->data[0] & 0x3fffffff);
  73                 fb_size = prop->data[1];
  74         }
  75
  76         rpi_prop(RPI_TAG_GETFBPITCH);
  77         rpi_prop(RPI_TAG_GETFBOFFS);
  78         rpi_prop_send();
  79         /*
  80         if(rpi_prop_send() == -1) {
  81                 printf("Failed to get pitch\n");
  82                 return -1;
  83         }
  84         */
  85
  86         while((prop = rpi_prop_next())) {
  87                 switch(prop->id) {
  88                 case RPI_TAG_GETFBPITCH:
  89                         fb_pitch = prop->data[0];
  90                         break;
  91
  92                 case RPI_TAG_GETFBOFFS:
  93                         fb_xoffs = prop->data[0];
  94                         fb_yoffs = prop->data[1];
  95                         break;
  96
  97                 default:
  98                         break;
  99                 }
 100         }
 101
 102         printf("Got video mode: %dx%d (%d bpp)\n", scr_width, scr_height, fb_depth);
 103         printf("Framebuffer: %dx%d at %p (%d bytes)\n", fb_width, fb_height, fb_pixels, fb_size);
 104         printf("  virtual offset: %d, %d\n", fb_xoffs, fb_yoffs);
 105         printf("  scanline pitch: %d\n", fb_pitch);
 106
 107         fbptr = fb_pixels;
 108         for(i=0; i<fb_height; i++) {
 109                 for(j=0; j<fb_width; j++) {
 110                         int r = i ^ j;
 111                         int g = (i ^ j) >> 1;
 112                         int b = (i ^ j) >> 2;
 113                         fbptr[j] = b | (g << 8) | (r << 16) | 0xff000000;
 114                 }
 115                 fbptr += fb_pitch >> 2;
 116         }
 117
 118         sysctl_dcache_clean_inval((uint32_t)fb_pixels, fb_size);
 119         return 0;
 120 }
 121
 122 int video_scroll(int x, int y)
 123 {
 124         struct rpi_prop *prop;
 125
 126         rpi_prop(RPI_TAG_SETFBOFFS, x, y);
 127         if(rpi_prop_send() == -1 || !(prop = rpi_prop_find(RPI_TAG_SETFBOFFS))) {
 128                 return -1;
 129         }
 130
 131         fb_xoffs = prop->data[0];
 132         fb_yoffs = prop->data[1];
 133         return 0;
 134 }
 135
 136 void video_update(int dt)
 137 {
 138         static int dirx = 1, diry = 1;
 139         int nx, ny;
 140
 141         nx = fb_xoffs + dirx * dt;
 142         ny = fb_yoffs + diry * dt;
 143
 144         if(nx < 0) {
 145                 nx = 0;
 146                 dirx = -dirx;
 147         } else if(nx + scr_width >= fb_width) {
 148                 nx = fb_width - scr_width;
 149                 dirx = -dirx;
 150         }
 151         if(ny < 0) {
 152                 ny = 0;
 153                 diry = -diry;
 154         } else if(ny + scr_height >= fb_height) {
 155                 ny = fb_height - scr_height;
 156                 diry = -diry;
 157         }
 158
 159         video_scroll(nx, ny);
 160 }