8bitworkshop/presets/coleco/mode2bitmap.c



#include <stdlib.h>

#include <cv.h>
#include <cvu.h>

#define PATTERN	0x0000	// $0000 - $17ff
#define IMAGE	0x1800	// $1800 - $1aff
#define SPRITES	0x1b00	// not used
#define COLOR	0x2000	// $2000 - $37ff

/* link in MODE 2 bitmap data */

//#link "sailboat.s"

extern const unsigned char msx_bitmap[0x3807];

void setup_mode2() {
  cvu_vmemset(0, 0, 0x4000);
  cv_set_screen_mode(CV_SCREENMODE_BITMAP); // mode 2
  cv_set_image_table(IMAGE);
  cv_set_character_pattern_t(PATTERN|0x1fff); // AND mask
  cv_set_color_table(COLOR|0x1fff); // AND mask
  cv_set_sprite_attribute_table(SPRITES);
}

void main() {
  // turn off screen
  cv_set_screen_active(false);
  // setup mode 2 grpahics
  setup_mode2();
  // copy pattern and color tables
  cvu_memtovmemcpy(PATTERN, msx_bitmap+7, 0x1800);
  cvu_memtovmemcpy(COLOR, msx_bitmap+7+COLOR, 0x1800);
  // set IMAGE table to incrementing values
  for (int i=0; i<0x300; i++) {
    	cvu_voutb(i, IMAGE+i);
  }
  // clear sprite table
  cvu_vmemset(SPRITES, 0, 0x100);
  // turn off screen
  cv_set_screen_active(true);
  while (1) {
    //cv_set_character_pattern_t(PATTERN|rand()); // AND mask
    //cv_set_color_table(COLOR|rand()); // AND mask
  }
}