122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
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#include <cv.h>
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#include <cvu.h>
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// SMS doesn't have a BIOS
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// so we have to link in a pattern table
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#ifdef CV_SMS
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//#link "fonts.s"
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extern uintptr_t font_bitmap_a[];
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extern uintptr_t font_bitmap_0[];
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#endif
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// HALT waits for a 60 Hz interrupt
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#define wait_vsync() __asm__("halt")
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// VRAM table addresses
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#define PATTERN 0x0000 // 256*8 = 2048 bytes
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#define IMAGE 0x2000 // 32*24 = 768 bytes
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#define COLOR 0x0b00 // 32 bytes
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#define SPRITE_PATTERNS 0x3800 // 32*32 = 1024 bytes
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#define SPRITES 0x3c00 // 4*32 = 128 bytes
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#ifdef __PLATFORM_SMS_GG_LIBCV__
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/*{pal:444,n:32}*/
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const short PALETTE[32] = {
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0x2221, 0x4441, 0x6661, 0x8888, 0xaaaa, 0xcccc, 0xeeee, 0xffff,
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0x2222, 0x4444, 0x6666, 0x8888, 0xaaaa, 0xcccc, 0xeeee, 0xffff,
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0x2222, 0x4444, 0x6666, 0x8888, 0xaaaa, 0xcccc, 0xeeee, 0xffff,
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0x2222, 0x4444, 0x6666, 0x8888, 0xaaaa, 0xcccc, 0xeeee, 0xffff,
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};
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#else
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/*{pal:222,n:32}*/
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const char PALETTE[32] = {
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0x10, 0x03, 0x0B, 0x0F, 0x13, 0x17, 0x1B, 0x1F,
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0x22, 0x28, 0x2A, 0x2E, 0x30, 0x37, 0x3B, 0x3F,
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0x10, 0x03, 0x0B, 0x0F, 0x13, 0x17, 0x1B, 0x1F,
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0x22, 0x28, 0x2A, 0x2E, 0x30, 0x37, 0x3B, 0x3F,
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};
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#endif
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/*{w:8,h:8,bpp:1,count:2,brev:1,np:4,pofs:1,sl:4}*/
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const char PATTERNS[64] = {
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0x7C, 0x1C, 0x64, 0x64,
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0xFE, 0x7E, 0xFE, 0xFE,
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0xD6, 0x7E, 0xD6, 0xD6,
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0xFE, 0x7E, 0xFE, 0xFE,
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0x66, 0xE6, 0xE6, 0xE6,
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0xBC, 0xBC, 0xBC, 0x3C,
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0x18, 0x18, 0x3E, 0x18,
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0x7F, 0x18, 0x67, 0x18,
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0x7D, 0x3C, 0x02, 0x3C,
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0x7D, 0x3C, 0x9A, 0x3C,
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0x7C, 0x3C, 0x83, 0x3C,
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0x7E, 0x3C, 0x81, 0x3C,
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0x3E, 0x3E, 0x00, 0x00,
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0x36, 0x36, 0x00, 0x00,
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0x36, 0x36, 0x00, 0x00,
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0x00, 0x77, 0x77, 0x77,
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};
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// convert a mono bitmap to 4-plane
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// just copy each byte 4 times
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void expand_monobitmap(const char* src, int count) {
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while (count--) {
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char b = *src++;
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cv_voutb(b);
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cv_voutb(b);
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cv_voutb(b);
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cv_voutb(b);
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}
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}
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// set up mode 4 graphics
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void setup_graphics() {
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cv_set_screen_mode(CV_SCREENMODE_4);
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// set up tables
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cv_set_character_pattern_t(PATTERN | 0x3000); // mask for mode 4
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cv_set_image_table(IMAGE | 0x400); // mask for mode 4
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cv_set_sprite_attribute_table(SPRITES);
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cv_set_write_vram_address(PATTERN + '0'*32);
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// convert mono bitmap font to 4-plane in VRAM
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expand_monobitmap(font_bitmap_0, (128-48)*8);
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// copy sprites to pattern table VRAM
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cvu_memtovmemcpy(PATTERN+32, PATTERNS, sizeof(PATTERNS));
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// copy palettes to VRAM
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cvu_memtocmemcpy(0xc000, PALETTE, sizeof(PALETTE));
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}
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// image table has two bytes per cell (name + attribute)
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void show_text() {
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cvu_vmemset(IMAGE, 0, 32*28);
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cvu_memtovmemcpy(IMAGE, "H e l l o W o r l d \1 ", 12*2);
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}
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void main() {
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char i=0;
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struct cvu_sprite4 sprite;
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// set up mode 4 and draw initial text
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setup_graphics();
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show_text();
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// turn on screen
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cv_set_screen_active(true);
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// loop (once per frame)
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while (1) {
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wait_vsync();
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i++;
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// scroll background in two directions
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cv_set_hscroll(i);
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cv_set_vscroll(i);
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// move sprite across screen
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sprite.y = i;
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sprite.x = i;
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sprite.name = 1;
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cvu_set_sprite4(SPRITES, 0, &sprite);
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sprite.y += 8;
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sprite.name++;
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cvu_set_sprite4(SPRITES, 1, &sprite);
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}
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}
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