git.mutantstargoat.com Git - dosdemo/blob - src/mike.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <math.h>
   5 #include <assert.h>
   6 #include "imago2.h"
   7 #include "demo.h"
   8 #include "screen.h"
   9
  10 #define BG_FILENAME "data/grise.png"
  11
  12 static int init(void);
  13 static void destroy(void);
  14 static void start(long trans_time);
  15 static void stop(long trans_time);
  16 static void draw(void);
  17
  18 static void convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount);
  19
  20 static unsigned short *background = 0;
  21 static unsigned int backgroundW = 0;
  22 static unsigned int backgroundH = 0;
  23
  24 static struct screen scr = {
  25         "mike",
  26         init,
  27         destroy,
  28         start,
  29         stop,
  30         draw
  31 };
  32
  33 struct screen *mike_screen(void)
  34 {
  35         return &scr;
  36 }
  37
  38
  39 static int init(void)
  40 {
  41         if (!(background = img_load_pixels(BG_FILENAME, &backgroundW, &backgroundH, IMG_FMT_RGBA32))) {
  42                 fprintf(stderr, "failed to load image " BG_FILENAME "\n");
  43                 return -1;
  44         }
  45
  46         /* Convert to 16bpp */
  47         convert32To16((unsigned int*)background, background, backgroundW * backgroundH);
  48
  49         return 0;
  50 }
  51
  52 static void destroy(void)
  53 {
  54         img_free_pixels(background);
  55 }
  56
  57 static void start(long trans_time)
  58 {
  59
  60 }
  61
  62 static void stop(long trans_time)
  63 {
  64 }
  65
  66 static void draw(void)
  67 {
  68         unsigned short *pixels = fb_pixels;
  69
  70         int j, i;
  71         for (j = 0; j < fb_height; j++) {
  72                 for (i = 0; i < fb_width; i++) {
  73                         *pixels++ = 0x0000;
  74                 }
  75         }
  76
  77         memcpy(fb_pixels, background, backgroundW * backgroundH * 2);
  78 }
  79
  80 /* src and dst can be the same */
  81 static void convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount) {
  82         unsigned int p;
  83         while (pixelCount) {
  84                 p = *src32++;
  85                 *dst16++ =      ((p << 8) & 0xF800)             /* R */
  86                         |               ((p >> 5) & 0x07E0)             /* G */
  87                         |               ((p >> 19) & 0x001F);   /* B */
  88                 pixelCount--;
  89         }
  90 }
  91
  92