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-rw-r--r--src/bg.c533
1 files changed, 533 insertions, 0 deletions
diff --git a/src/bg.c b/src/bg.c
new file mode 100644
index 000000000..4130e4bab
--- /dev/null
+++ b/src/bg.c
@@ -0,0 +1,533 @@
+#include "global.h"
+#include "dma3.h"
+
+#define DISPCNT_ALL_BG_AND_MODE_BITS 0x0F07
+#define SECONDARY_TILESET_BASE_TILE 0x4000
+#define SECONDARY_TILESET_BASE_BLOCK 0x800
+
+struct BgControl {
+ struct BgConfig {
+ u16 visible:1;
+ u16 unknown_1:1;
+ u16 screenSize:2;
+ u16 priority:2;
+ u16 mosaic:1;
+ u16 wraparound:1;
+
+ u16 tilesBaseBlock:2;
+ u16 tileMapBaseBlock:5;
+ u16 paletteMode:1;
+
+ u8 unknown_2;
+ u8 unknown_3;
+ } configs[4];
+
+ u16 bgVisibilityAndMode;
+};
+
+struct BgTemplate {
+ u32 bg:2;
+ u32 tilesBaseBlock:2;
+ u32 tileMapBaseBlock:5;
+ u32 screenSize:2;
+ u32 paletteMode:1;
+ u32 priority:2;
+ u32 unk_1:10;
+};
+
+struct BgConfig2 {
+ u32 unk_1:10;
+ u32 unk_2:4;
+ u32 unk_3:18;
+
+ u32 unk_4;
+ u32 unk_5;
+ u32 unk_6;
+};
+
+extern struct BgControl gUnknown_030008E0; // gGpuBgConfigs
+extern struct BgConfig2 gUnknown_030008F8[4]; // gGpuBgConfigs2
+extern u32 gUnknown_03000938[4];
+extern u32 gUnneededFireRedVariable;
+extern struct BgConfig gZeroedBgControlStruct;
+extern bool32 IsInvalidBgDuplicate(u8 bg);
+
+void ResetBgControlStructs();
+
+extern void SetTextModeAndHideBgs();
+extern bool8 IsInvalidBg(u8 bg);
+extern void SetGpuReg(u8 regOffset, u16 value);
+extern u16 GetGpuReg(u8 regOffset);
+
+void ResetBgs(void)
+{
+ ResetBgControlStructs();
+ gUnknown_030008E0.bgVisibilityAndMode = 0;
+ SetTextModeAndHideBgs();
+}
+
+void SetBgModeInternal(u8 bgMode)
+{
+ gUnknown_030008E0.bgVisibilityAndMode &= 0xFFF8;
+ gUnknown_030008E0.bgVisibilityAndMode |= bgMode;
+}
+
+u8 GetBgMode(void)
+{
+ return gUnknown_030008E0.bgVisibilityAndMode & 0x7;
+}
+
+void ResetBgControlStructs(void)
+{
+ struct BgConfig* bgConfigs = &gUnknown_030008E0.configs[0];
+ struct BgConfig zeroedConfig = gZeroedBgControlStruct;
+ int i;
+
+ for (i = 0; i < 4; i++)
+ {
+ bgConfigs[i] = zeroedConfig;
+ }
+}
+
+void Unused_ResetBgControlStruct(u8 bg)
+{
+ if (IsInvalidBg(bg) == FALSE)
+ {
+ gUnknown_030008E0.configs[bg] = gZeroedBgControlStruct;
+ }
+}
+
+void SetBgControlAttributes(u8 bg, u8 tilesBaseBlock, u8 tileMapBaseBlock, u8 screenSize, u8 paletteMode, u8 priority, u8 mosaic, u8 wraparound)
+{
+ if (IsInvalidBg(bg) == FALSE)
+ {
+ if (tilesBaseBlock != 0xFF)
+ {
+ gUnknown_030008E0.configs[bg].tilesBaseBlock = tilesBaseBlock & 0x3;
+ }
+
+ if (tileMapBaseBlock != 0xFF)
+ {
+ gUnknown_030008E0.configs[bg].tileMapBaseBlock = tileMapBaseBlock & 0x1F;
+ }
+
+ if (screenSize != 0xFF)
+ {
+ gUnknown_030008E0.configs[bg].screenSize = screenSize & 0x3;
+ }
+
+ if (paletteMode != 0xFF)
+ {
+ gUnknown_030008E0.configs[bg].paletteMode = paletteMode;
+ }
+
+ if (priority != 0xFF)
+ {
+ gUnknown_030008E0.configs[bg].priority = priority & 0x3;
+ }
+
+ if (mosaic != 0xFF)
+ {
+ gUnknown_030008E0.configs[bg].mosaic = mosaic & 0x1;
+ }
+
+ if (wraparound != 0xFF)
+ {
+ gUnknown_030008E0.configs[bg].wraparound = wraparound;
+ }
+
+ gUnknown_030008E0.configs[bg].unknown_2 = 0;
+ gUnknown_030008E0.configs[bg].unknown_3 = 0;
+
+ gUnknown_030008E0.configs[bg].visible = 1;
+ }
+}
+
+u16 GetBgControlAttribute(u8 bg, u8 attributeId)
+{
+ if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
+ {
+ switch (attributeId)
+ {
+ case 1:
+ return gUnknown_030008E0.configs[bg].visible;
+ case 2:
+ return gUnknown_030008E0.configs[bg].tilesBaseBlock;
+ case 3:
+ return gUnknown_030008E0.configs[bg].tileMapBaseBlock;
+ case 4:
+ return gUnknown_030008E0.configs[bg].screenSize;
+ case 5:
+ return gUnknown_030008E0.configs[bg].paletteMode;
+ case 6:
+ return gUnknown_030008E0.configs[bg].priority;
+ case 7:
+ return gUnknown_030008E0.configs[bg].mosaic;
+ case 8:
+ return gUnknown_030008E0.configs[bg].wraparound;
+ }
+ }
+
+ return 0xFF;
+}
+
+u8 LoadBgVram(u8 bg, void *src, u16 size, u16 destOffset, u8 mode)
+{
+ u16 offset;
+ s8 cursor;
+
+ if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
+ {
+ switch (mode)
+ {
+ case 0x1:
+ offset = gUnknown_030008E0.configs[bg].tilesBaseBlock * SECONDARY_TILESET_BASE_TILE;
+ break;
+ case 0x2:
+ offset = gUnknown_030008E0.configs[bg].tileMapBaseBlock * SECONDARY_TILESET_BASE_BLOCK;
+ break;
+ default:
+ cursor = -1;
+ goto end;
+ }
+
+ offset = destOffset + offset;
+
+ cursor = RequestDma3Copy(src, (void*)(offset + BG_VRAM), size, 0);
+
+ if (cursor == -1)
+ {
+ return -1;
+ }
+ }
+ else
+ {
+ return -1;
+ }
+
+end:
+ return cursor;
+}
+
+void ShowBgInternal(u8 bg)
+{
+ u16 value;
+ if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
+ {
+ value = gUnknown_030008E0.configs[bg].priority |
+ (gUnknown_030008E0.configs[bg].tilesBaseBlock << 2) |
+ (gUnknown_030008E0.configs[bg].mosaic << 6) |
+ (gUnknown_030008E0.configs[bg].paletteMode << 7) |
+ (gUnknown_030008E0.configs[bg].tileMapBaseBlock << 8) |
+ (gUnknown_030008E0.configs[bg].wraparound << 13) |
+ (gUnknown_030008E0.configs[bg].screenSize << 14);
+
+ SetGpuReg((bg << 1) + 0x8, value);
+
+ gUnknown_030008E0.bgVisibilityAndMode |= 1 << (bg + 8);
+ gUnknown_030008E0.bgVisibilityAndMode &= DISPCNT_ALL_BG_AND_MODE_BITS;
+ }
+}
+
+void HideBgInternal(u8 bg)
+{
+ if (IsInvalidBg(bg) == FALSE)
+ {
+ gUnknown_030008E0.bgVisibilityAndMode &= ~(1 << (bg + 8));
+ gUnknown_030008E0.bgVisibilityAndMode &= DISPCNT_ALL_BG_AND_MODE_BITS;
+ }
+}
+
+void SyncBgVisibilityAndMode()
+{
+ SetGpuReg(0, (GetGpuReg(0) & ~DISPCNT_ALL_BG_AND_MODE_BITS) | gUnknown_030008E0.bgVisibilityAndMode);
+}
+
+void SetTextModeAndHideBgs()
+{
+ SetGpuReg(0, GetGpuReg(0) & ~DISPCNT_ALL_BG_AND_MODE_BITS);
+}
+
+void SetBgAffineInternal(u8 bg, u32 srcCenterX, u32 srcCenterY, u16 dispCenterX, u16 dispCenterY, u16 scaleX, u16 scaleY, u16 rotationAngle)
+{
+ struct BgAffineSrcData src;
+ struct BgAffineDstData dest;
+
+ switch (gUnknown_030008E0.bgVisibilityAndMode & 0x7)
+ {
+ case 1:
+ if (bg != 2)
+ return;
+ break;
+ case 2:
+ if (bg < 2 || bg > 3)
+ return;
+ break;
+ case 0:
+ default:
+ return;
+ }
+
+ src.texX = srcCenterX;
+ src.texY = srcCenterY;
+ src.scrX = dispCenterX;
+ src.scrY = dispCenterY;
+ src.sx = scaleX;
+ src.sy = scaleY;
+ src.alpha = rotationAngle;
+
+ BgAffineSet(&src, &dest, 1);
+
+ SetGpuReg(REG_OFFSET_BG2PA, dest.pa);
+ SetGpuReg(REG_OFFSET_BG2PB, dest.pb);
+ SetGpuReg(REG_OFFSET_BG2PC, dest.pc);
+ SetGpuReg(REG_OFFSET_BG2PD, dest.pd);
+ SetGpuReg(REG_OFFSET_BG2PA, dest.pa);
+ SetGpuReg(REG_OFFSET_BG2X_L, (s16)(dest.dx));
+ SetGpuReg(REG_OFFSET_BG2X_H, (s16)(dest.dx >> 16));
+ SetGpuReg(REG_OFFSET_BG2Y_L, (s16)(dest.dy));
+ SetGpuReg(REG_OFFSET_BG2Y_H, (s16)(dest.dy >> 16));
+}
+
+bool8 IsInvalidBg(u8 bg)
+{
+ if (bg > 3)
+ return TRUE;
+ return FALSE;
+}
+
+int DummiedOutFireRedLeafGreenTileAllocFunc(int a1, int a2, int a3, int a4)
+{
+ return 0;
+}
+
+void ResetBgsAndClearDma3BusyFlags(u32 leftoverFireRedLeafGreenVariable)
+{
+ int i;
+ ResetBgs();
+
+ for (i = 0; i < 4; i++)
+ {
+ gUnknown_03000938[i] = 0;
+ }
+
+ gUnneededFireRedVariable = leftoverFireRedLeafGreenVariable;
+}
+
+void InitBgsFromTemplates(u8 bgMode, struct BgTemplate *templates, u8 numTemplates)
+{
+ int i;
+ u8 bg;
+
+ SetBgModeInternal(bgMode);
+ ResetBgControlStructs();
+
+ for (i = 0; i < numTemplates; i++)
+ {
+ bg = templates[i].bg;
+ if (bg < 4) {
+ SetBgControlAttributes(bg,
+ templates[i].tilesBaseBlock,
+ templates[i].tileMapBaseBlock,
+ templates[i].screenSize,
+ templates[i].paletteMode,
+ templates[i].priority,
+ 0,
+ 0);
+
+ gUnknown_030008F8[bg].unk_1 = templates[i].unk_1;
+ gUnknown_030008F8[bg].unk_2 = 0;
+ gUnknown_030008F8[bg].unk_3 = 0;
+
+ gUnknown_030008F8[bg].unk_4 = 0;
+ gUnknown_030008F8[bg].unk_5 = 0;
+ gUnknown_030008F8[bg].unk_6 = 0;
+ }
+ }
+}
+
+void InitBgFromTemplate(struct BgTemplate *template)
+{
+ u8 bg = template->bg;
+
+ if (bg < 4)
+ {
+ SetBgControlAttributes(bg,
+ template->tilesBaseBlock,
+ template->tileMapBaseBlock,
+ template->screenSize,
+ template->paletteMode,
+ template->priority,
+ 0,
+ 0);
+
+ gUnknown_030008F8[bg].unk_1 = template->unk_1;
+ gUnknown_030008F8[bg].unk_2 = 0;
+ gUnknown_030008F8[bg].unk_3 = 0;
+
+ gUnknown_030008F8[bg].unk_4 = 0;
+ gUnknown_030008F8[bg].unk_5 = 0;
+ gUnknown_030008F8[bg].unk_6 = 0;
+ }
+}
+
+void SetBgMode(u8 bgMode)
+{
+ SetBgModeInternal(bgMode);
+}
+
+u16 LoadBgTiles(u8 bg, void *src, u16 size, u16 destOffset)
+{
+ u16 unk;
+ u8 cursor;
+
+ if (GetBgControlAttribute(bg, 5) == 0)
+ {
+ unk = (gUnknown_030008F8[bg].unk_1 + destOffset) * 0x20;
+ }
+ else
+ {
+ unk = (gUnknown_030008F8[bg].unk_1 + destOffset) * 0x40;
+ }
+
+ cursor = LoadBgVram(bg, src, size, unk, DISPCNT_MODE_1);
+
+ if (cursor == 0xFF)
+ {
+ return -1;
+ }
+
+ gUnknown_03000938[cursor >> 5] |= (1 << (cursor & 0x1F));
+
+ if (gUnneededFireRedVariable == 1)
+ {
+ DummiedOutFireRedLeafGreenTileAllocFunc(bg, unk >> 5, size >> 5, 1);
+ }
+
+ return cursor;
+}
+
+u16 LoadBgTilemap(u8 bg, void *src, u16 size, u16 destOffset)
+{
+ u8 cursor;
+
+ cursor = LoadBgVram(bg, src, size, destOffset * 2, DISPCNT_MODE_2);
+
+ if (cursor == 0xFF)
+ {
+ return -1;
+ }
+
+ gUnknown_03000938[cursor >> 5] |= (1 << (cursor & 0x1F));
+
+ return cursor;
+}
+
+#ifdef NONMATCHING
+u16 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
+{
+ u16 unk_1;
+ s8 cursor;
+ int cursor2;
+ u32* ptr;
+
+ if (IsInvalidBgDuplicate(bg) == FALSE)
+ {
+ unk_1 = (gUnknown_030008F8[bg].unk_2 * 0x20) + (destOffset * 2);
+ cursor = RequestDma3Copy(src, (void*)(unk_1 + BG_PLTT), size, 0);
+ cursor2 = cursor;
+ }
+ else
+ {
+ return -1;
+ }
+
+ if (cursor == -1)
+ {
+ return -1;
+ }
+
+ ptr = gUnknown_03000938;
+
+ if (cursor < 0)
+ {
+ cursor2 += 0x1F;
+ }
+
+ cursor2 >>= 5;
+
+ ptr[cursor2] |= (1 << (s8)(cursor - (cursor2 << 5)));
+
+ return (u8)cursor;
+}
+#else
+__attribute__((naked))
+u8 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
+{
+ asm("push {r4-r7,lr}\n\
+ add r7, r1, #0\n\
+ lsl r0, #24\n\
+ lsr r4, r0, #24\n\
+ lsl r2, #16\n\
+ lsr r6, r2, #16\n\
+ lsl r3, #16\n\
+ lsr r5, r3, #16\n\
+ add r0, r4, #0\n\
+ bl IsInvalidBgDuplicate\n\
+ cmp r0, #0\n\
+ bne _08001A98\n\
+ ldr r1, =gUnknown_030008F8\n\
+ lsl r0, r4, #4\n\
+ add r0, r1\n\
+ ldrb r1, [r0, #0x1]\n\
+ lsl r1, #26\n\
+ lsr r1, #28\n\
+ lsl r1, #5\n\
+ lsl r0, r5, #1\n\
+ add r1, r0\n\
+ lsl r1, #16\n\
+ lsr r1, #16\n\
+ mov r0, #0xA0\n\
+ lsl r0, #19\n\
+ add r1, r0\n\
+ add r0, r7, #0\n\
+ add r2, r6, #0\n\
+ mov r3, #0\n\
+ bl RequestDma3Copy\n\
+ lsl r3, r0, #24\n\
+ asr r1, r3, #24\n\
+ mov r0, #0x1\n\
+ neg r0, r0\n\
+ cmp r1, r0\n\
+ bne _08001AA4\n\
+_08001A98:\n\
+ ldr r0, =0x0000ffff\n\
+ b _08001AC8\n\
+ .pool\n\
+_08001AA4:\n\
+ ldr r4, =gUnknown_03000938\n\
+ add r0, r1, #0\n\
+ cmp r1, #0\n\
+ bge _08001AAE\n\
+ add r0, #0x1F\n\
+_08001AAE:\n\
+ asr r0, #5\n\
+ lsl r2, r0, #2\n\
+ add r2, r4\n\
+ lsl r0, #5\n\
+ sub r0, r1, r0\n\
+ lsl r0, #24\n\
+ asr r0, #24\n\
+ mov r1, #0x1\n\
+ lsl r1, r0\n\
+ ldr r0, [r2]\n\
+ orr r0, r1\n\
+ str r0, [r2]\n\
+ lsr r0, r3, #24\n\
+_08001AC8:\n\
+ pop {r4-r7}\n\
+ pop {r1}\n\
+ bx r1\n\
+ .pool");
+}
+#endif // NONMATCHING
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-10 10:47:30 +0000