drinkingtea/nostalgia
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[teagba] Add set and scroll background offset functions
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This commit is contained in:
Gary Talent
2025-07-29 00:33:51 -05:00
parent fd610454d6
commit e27eee50f0
3 changed files with 45 additions and 13 deletions
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40
deps/teagba/include/teagba/addresses.hpp vendored
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@@ -54,25 +54,41 @@ inline volatile BgCtl &regBgCtl(uintptr_t const bgIdx) noexcept {
}
// background horizontal scrolling registers
#define REG_BG0HOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'0010))
#define REG_BG1HOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'0014))
#define REG_BG2HOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'0018))
#define REG_BG3HOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'001c))
#define REG_BG0HOFS (*reinterpret_cast<volatile int16_t*>(0x0400'0010))
#define REG_BG1HOFS (*reinterpret_cast<volatile int16_t*>(0x0400'0014))
#define REG_BG2HOFS (*reinterpret_cast<volatile int16_t*>(0x0400'0018))
#define REG_BG3HOFS (*reinterpret_cast<volatile int16_t*>(0x0400'001c))
[[nodiscard]]
volatile uint32_t &regBgHofs(auto const bgIdx) noexcept {
return *reinterpret_cast<volatile uint32_t*>(0x0400'0010 + 4 * bgIdx);
volatile int16_t &regBgHofs(auto const bgIdx) noexcept {
return *reinterpret_cast<volatile int16_t*>(0x0400'0010 + 4 * bgIdx);
}
// background vertical scrolling registers
#define REG_BG0VOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'0012))
#define REG_BG1VOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'0016))
#define REG_BG2VOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'001a))
#define REG_BG3VOFS (*reinterpret_cast<volatile uint32_t*>(0x0400'001e))
#define REG_BG0VOFS (*reinterpret_cast<volatile int16_t*>(0x0400'0012))
#define REG_BG1VOFS (*reinterpret_cast<volatile int16_t*>(0x0400'0016))
#define REG_BG2VOFS (*reinterpret_cast<volatile int16_t*>(0x0400'001a))
#define REG_BG3VOFS (*reinterpret_cast<volatile int16_t*>(0x0400'001e))
[[nodiscard]]
volatile uint32_t &regBgVofs(auto const bgIdx) noexcept {
return *reinterpret_cast<volatile uint32_t*>(0x0400'0012 + 4 * bgIdx);
volatile int16_t &regBgVofs(auto const bgIdx) noexcept {
return *reinterpret_cast<volatile int16_t*>(0x0400'0012 + 4 * bgIdx);
}
// background scrolling registers
struct OffsetPair {
int16_t x{}, y{};
};
#define REG_BG0OFS (*reinterpret_cast<volatile OffsetPair*>(0x0400'0010))
#define REG_BG1OFS (*reinterpret_cast<volatile OffsetPair*>(0x0400'0014))
#define REG_BG2OFS (*reinterpret_cast<volatile OffsetPair*>(0x0400'0018))
#define REG_BG3OFS (*reinterpret_cast<volatile OffsetPair*>(0x0400'001c))
[[nodiscard]]
volatile OffsetPair &regBgOfs(auto const bgIdx) noexcept {
return *reinterpret_cast<volatile OffsetPair*>(0x0400'0010 + sizeof(OffsetPair) * bgIdx);
}
/////////////////////////////////////////////////////////////////

4
deps/teagba/include/teagba/gfx.hpp vendored
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@@ -41,4 +41,8 @@ void addSpriteUpdate(GbaSpriteAttrUpdate const &upd) noexcept;
void applySpriteUpdates() noexcept;
void setBgOffset(uint16_t bg, int16_t x, int16_t y) noexcept;
void scrollBgOffset(uint16_t bg, int16_t x, int16_t y) noexcept;
}

14
deps/teagba/src/gfx.cpp vendored
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@@ -12,7 +12,7 @@ namespace teagba {
static ox::Array<GbaSpriteAttrUpdate, 128> g_spriteBuffer;
GbaSpriteAttrUpdate &spriteAttr(size_t i) noexcept {
GbaSpriteAttrUpdate &spriteAttr(size_t const i) noexcept {
return g_spriteBuffer[i];
}
@@ -29,4 +29,16 @@ void applySpriteUpdates() noexcept {
}
}
void setBgOffset(uint16_t const bg, int16_t const x, int16_t const y) noexcept {
auto &o = regBgOfs(bg);
o.x = x;
o.y = y;
}
void scrollBgOffset(uint16_t const bg, int16_t const x, int16_t const y) noexcept {
auto &o = regBgOfs(bg);
o.x = o.x + x;
o.y = o.y + y;
}
}