70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//
|
|
// Created by Wouter Groeneveld on 28/07/18.
|
|
//
|
|
|
|
#include <engine/gba/tonc_memmap.h>
|
|
#include <stdexcept>
|
|
#include <engine/allocator.h>
|
|
#ifdef CODE_COMPILED_AS_PART_OF_TEST
|
|
#include <engine/gba/tonc_core_stub.h>
|
|
#else
|
|
#include <engine/gba/tonc_core.h>
|
|
#endif
|
|
#include <engine/background/background.h>
|
|
#include <engine/background/text_stream.h>
|
|
|
|
#define TRANSPARENT_TILE_NUMBER 192 // as shown in mGBA, next "free" tile after text. Hardcoded indeed.
|
|
|
|
// WHY using this instead of Allocation?
|
|
// Because each char block seems to be 16K and there are 4 - there are also 4 backgrounds.
|
|
// Use the bgIndex as a hardcoded char block and let the background decide on the map screen block.
|
|
void* screen_block(unsigned long block) {
|
|
return (void*) (0x6000000 + (block * 0x800));
|
|
}
|
|
|
|
void* char_block(unsigned long block) {
|
|
return (void*) (0x6000000 + (block * 0x4000));
|
|
}
|
|
|
|
void Background::persist() {
|
|
dma3_cpy(char_block(bgIndex), this->data, this->size);
|
|
|
|
if(this->map) {
|
|
dma3_cpy(screen_block(screenBlockIndex), this->map, this->mapSize);
|
|
}
|
|
|
|
buildRegister();
|
|
}
|
|
|
|
void Background::clearMap() {
|
|
volatile auto ptr = &se_mem[screenBlockIndex][0];
|
|
for (int i = 0; i < this->mapSize; i++) {
|
|
ptr[i] = TRANSPARENT_TILE_NUMBER;
|
|
}
|
|
}
|
|
|
|
u32 Background::getBgControlRegisterIndex() {
|
|
switch(bgIndex) {
|
|
case 0: return 0x0008;
|
|
case 1: return 0x000A;
|
|
case 2: return 0x000C;
|
|
case 3: return 0x000E;
|
|
}
|
|
throw std::runtime_error("unknown bg index");
|
|
}
|
|
|
|
void Background::buildRegister() {
|
|
*(vu16*)(REG_BASE+getBgControlRegisterIndex()) =
|
|
bgIndex | /* priority, 0 is highest, 3 is lowest */
|
|
(bgIndex << 2) | /* the char block the image data is stored in */
|
|
(0 << 6) | /* the mosaic flag */
|
|
(1 << 7) | /* color mode, 0 is 16 colors, 1 is 256 colors */
|
|
(screenBlockIndex << 8) | /* the screen block the tile data is stored in */
|
|
(1 << 13) | /* wrapping flag */
|
|
(0 << 14);
|
|
}
|
|
|
|
void Background::scroll(int x, int y) {
|
|
REG_BG_OFS[bgIndex].x = x;
|
|
REG_BG_OFS[bgIndex].y = y;
|
|
} |