mirror of
https://github.com/Ninjdai1/pokeemerald.git
synced 2024-11-16 11:37:40 +01:00
Begin disassembling bg.s
This commit is contained in:
Diegoisawesome
parent
7ea0d462c4
commit
ea33650dc1
@ -42,6 +42,7 @@ SECTIONS {
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src/malloc.o(.text);
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src/dma3_manager.o(.text);
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src/gpu_regs.o(.text);
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src/bg.o(.text);
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asm/bg.o(.text);
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asm/blit.o(.text);
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src/window.o(.text);
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533
src/bg.c
Normal file
533
src/bg.c
Normal file
@ -0,0 +1,533 @@
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#include "global.h"
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#include "dma3.h"
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#define DISPCNT_ALL_BG_AND_MODE_BITS 0x0F07
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#define SECONDARY_TILESET_BASE_TILE 0x4000
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#define SECONDARY_TILESET_BASE_BLOCK 0x800
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struct BgControl {
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struct BgConfig {
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u16 visible:1;
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u16 unknown_1:1;
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u16 screenSize:2;
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u16 priority:2;
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u16 mosaic:1;
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u16 wraparound:1;
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u16 tilesBaseBlock:2;
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u16 tileMapBaseBlock:5;
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u16 paletteMode:1;
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u8 unknown_2;
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u8 unknown_3;
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} configs[4];
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u16 bgVisibilityAndMode;
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};
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struct BgTemplate {
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u32 bg:2;
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u32 tilesBaseBlock:2;
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u32 tileMapBaseBlock:5;
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u32 screenSize:2;
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u32 paletteMode:1;
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u32 priority:2;
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u32 unk_1:10;
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};
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struct BgConfig2 {
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u32 unk_1:10;
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u32 unk_2:4;
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u32 unk_3:18;
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u32 unk_4;
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u32 unk_5;
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u32 unk_6;
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};
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extern struct BgControl gUnknown_030008E0; // gGpuBgConfigs
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extern struct BgConfig2 gUnknown_030008F8[4]; // gGpuBgConfigs2
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extern u32 gUnknown_03000938[4];
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extern u32 gUnneededFireRedVariable;
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extern struct BgConfig gZeroedBgControlStruct;
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extern bool32 IsInvalidBgDuplicate(u8 bg);
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void ResetBgControlStructs();
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extern void SetTextModeAndHideBgs();
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extern bool8 IsInvalidBg(u8 bg);
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extern void SetGpuReg(u8 regOffset, u16 value);
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extern u16 GetGpuReg(u8 regOffset);
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void ResetBgs(void)
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{
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ResetBgControlStructs();
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gUnknown_030008E0.bgVisibilityAndMode = 0;
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SetTextModeAndHideBgs();
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}
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void SetBgModeInternal(u8 bgMode)
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{
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gUnknown_030008E0.bgVisibilityAndMode &= 0xFFF8;
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gUnknown_030008E0.bgVisibilityAndMode |= bgMode;
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}
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u8 GetBgMode(void)
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{
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return gUnknown_030008E0.bgVisibilityAndMode & 0x7;
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}
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void ResetBgControlStructs(void)
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{
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struct BgConfig* bgConfigs = &gUnknown_030008E0.configs[0];
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struct BgConfig zeroedConfig = gZeroedBgControlStruct;
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int i;
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for (i = 0; i < 4; i++)
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{
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bgConfigs[i] = zeroedConfig;
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}
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}
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void Unused_ResetBgControlStruct(u8 bg)
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{
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if (IsInvalidBg(bg) == FALSE)
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{
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gUnknown_030008E0.configs[bg] = gZeroedBgControlStruct;
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}
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}
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void SetBgControlAttributes(u8 bg, u8 tilesBaseBlock, u8 tileMapBaseBlock, u8 screenSize, u8 paletteMode, u8 priority, u8 mosaic, u8 wraparound)
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{
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if (IsInvalidBg(bg) == FALSE)
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{
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if (tilesBaseBlock != 0xFF)
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{
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gUnknown_030008E0.configs[bg].tilesBaseBlock = tilesBaseBlock & 0x3;
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}
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if (tileMapBaseBlock != 0xFF)
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{
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gUnknown_030008E0.configs[bg].tileMapBaseBlock = tileMapBaseBlock & 0x1F;
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}
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if (screenSize != 0xFF)
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{
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gUnknown_030008E0.configs[bg].screenSize = screenSize & 0x3;
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}
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if (paletteMode != 0xFF)
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{
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gUnknown_030008E0.configs[bg].paletteMode = paletteMode;
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}
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if (priority != 0xFF)
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{
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gUnknown_030008E0.configs[bg].priority = priority & 0x3;
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}
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if (mosaic != 0xFF)
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{
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gUnknown_030008E0.configs[bg].mosaic = mosaic & 0x1;
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}
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if (wraparound != 0xFF)
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{
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gUnknown_030008E0.configs[bg].wraparound = wraparound;
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}
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gUnknown_030008E0.configs[bg].unknown_2 = 0;
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gUnknown_030008E0.configs[bg].unknown_3 = 0;
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gUnknown_030008E0.configs[bg].visible = 1;
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}
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}
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u16 GetBgControlAttribute(u8 bg, u8 attributeId)
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{
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if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
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{
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switch (attributeId)
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{
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case 1:
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return gUnknown_030008E0.configs[bg].visible;
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case 2:
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return gUnknown_030008E0.configs[bg].tilesBaseBlock;
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case 3:
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return gUnknown_030008E0.configs[bg].tileMapBaseBlock;
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case 4:
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return gUnknown_030008E0.configs[bg].screenSize;
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case 5:
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return gUnknown_030008E0.configs[bg].paletteMode;
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case 6:
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return gUnknown_030008E0.configs[bg].priority;
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case 7:
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return gUnknown_030008E0.configs[bg].mosaic;
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case 8:
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return gUnknown_030008E0.configs[bg].wraparound;
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}
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}
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return 0xFF;
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}
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u8 LoadBgVram(u8 bg, void *src, u16 size, u16 destOffset, u8 mode)
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{
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u16 offset;
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s8 cursor;
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if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
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{
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switch (mode)
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{
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case 0x1:
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offset = gUnknown_030008E0.configs[bg].tilesBaseBlock * SECONDARY_TILESET_BASE_TILE;
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break;
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case 0x2:
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offset = gUnknown_030008E0.configs[bg].tileMapBaseBlock * SECONDARY_TILESET_BASE_BLOCK;
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break;
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default:
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cursor = -1;
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goto end;
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}
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offset = destOffset + offset;
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cursor = RequestDma3Copy(src, (void*)(offset + BG_VRAM), size, 0);
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if (cursor == -1)
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{
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return -1;
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}
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}
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else
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{
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return -1;
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}
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end:
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return cursor;
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}
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void ShowBgInternal(u8 bg)
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{
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u16 value;
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if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
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{
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value = gUnknown_030008E0.configs[bg].priority |
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(gUnknown_030008E0.configs[bg].tilesBaseBlock << 2) |
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(gUnknown_030008E0.configs[bg].mosaic << 6) |
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(gUnknown_030008E0.configs[bg].paletteMode << 7) |
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(gUnknown_030008E0.configs[bg].tileMapBaseBlock << 8) |
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(gUnknown_030008E0.configs[bg].wraparound << 13) |
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(gUnknown_030008E0.configs[bg].screenSize << 14);
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SetGpuReg((bg << 1) + 0x8, value);
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gUnknown_030008E0.bgVisibilityAndMode |= 1 << (bg + 8);
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gUnknown_030008E0.bgVisibilityAndMode &= DISPCNT_ALL_BG_AND_MODE_BITS;
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}
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}
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void HideBgInternal(u8 bg)
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{
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if (IsInvalidBg(bg) == FALSE)
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{
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gUnknown_030008E0.bgVisibilityAndMode &= ~(1 << (bg + 8));
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gUnknown_030008E0.bgVisibilityAndMode &= DISPCNT_ALL_BG_AND_MODE_BITS;
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}
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}
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void SyncBgVisibilityAndMode()
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{
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SetGpuReg(0, (GetGpuReg(0) & ~DISPCNT_ALL_BG_AND_MODE_BITS) | gUnknown_030008E0.bgVisibilityAndMode);
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}
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void SetTextModeAndHideBgs()
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{
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SetGpuReg(0, GetGpuReg(0) & ~DISPCNT_ALL_BG_AND_MODE_BITS);
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}
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void SetBgAffineInternal(u8 bg, u32 srcCenterX, u32 srcCenterY, u16 dispCenterX, u16 dispCenterY, u16 scaleX, u16 scaleY, u16 rotationAngle)
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{
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struct BgAffineSrcData src;
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struct BgAffineDstData dest;
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switch (gUnknown_030008E0.bgVisibilityAndMode & 0x7)
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{
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case 1:
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if (bg != 2)
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return;
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break;
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case 2:
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if (bg < 2 || bg > 3)
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return;
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break;
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case 0:
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default:
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return;
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}
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src.texX = srcCenterX;
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src.texY = srcCenterY;
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src.scrX = dispCenterX;
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src.scrY = dispCenterY;
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src.sx = scaleX;
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src.sy = scaleY;
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src.alpha = rotationAngle;
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BgAffineSet(&src, &dest, 1);
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SetGpuReg(REG_OFFSET_BG2PA, dest.pa);
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SetGpuReg(REG_OFFSET_BG2PB, dest.pb);
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SetGpuReg(REG_OFFSET_BG2PC, dest.pc);
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SetGpuReg(REG_OFFSET_BG2PD, dest.pd);
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SetGpuReg(REG_OFFSET_BG2PA, dest.pa);
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SetGpuReg(REG_OFFSET_BG2X_L, (s16)(dest.dx));
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SetGpuReg(REG_OFFSET_BG2X_H, (s16)(dest.dx >> 16));
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SetGpuReg(REG_OFFSET_BG2Y_L, (s16)(dest.dy));
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SetGpuReg(REG_OFFSET_BG2Y_H, (s16)(dest.dy >> 16));
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}
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bool8 IsInvalidBg(u8 bg)
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{
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if (bg > 3)
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return TRUE;
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return FALSE;
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}
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int DummiedOutFireRedLeafGreenTileAllocFunc(int a1, int a2, int a3, int a4)
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{
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return 0;
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}
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void ResetBgsAndClearDma3BusyFlags(u32 leftoverFireRedLeafGreenVariable)
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{
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int i;
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ResetBgs();
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for (i = 0; i < 4; i++)
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{
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gUnknown_03000938[i] = 0;
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}
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gUnneededFireRedVariable = leftoverFireRedLeafGreenVariable;
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}
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void InitBgsFromTemplates(u8 bgMode, struct BgTemplate *templates, u8 numTemplates)
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{
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int i;
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u8 bg;
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SetBgModeInternal(bgMode);
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ResetBgControlStructs();
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for (i = 0; i < numTemplates; i++)
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{
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bg = templates[i].bg;
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if (bg < 4) {
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SetBgControlAttributes(bg,
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templates[i].tilesBaseBlock,
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templates[i].tileMapBaseBlock,
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templates[i].screenSize,
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templates[i].paletteMode,
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templates[i].priority,
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0,
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0);
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gUnknown_030008F8[bg].unk_1 = templates[i].unk_1;
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gUnknown_030008F8[bg].unk_2 = 0;
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gUnknown_030008F8[bg].unk_3 = 0;
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gUnknown_030008F8[bg].unk_4 = 0;
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gUnknown_030008F8[bg].unk_5 = 0;
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gUnknown_030008F8[bg].unk_6 = 0;
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}
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}
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}
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void InitBgFromTemplate(struct BgTemplate *template)
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{
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u8 bg = template->bg;
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if (bg < 4)
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{
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SetBgControlAttributes(bg,
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template->tilesBaseBlock,
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template->tileMapBaseBlock,
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template->screenSize,
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template->paletteMode,
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template->priority,
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0,
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0);
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gUnknown_030008F8[bg].unk_1 = template->unk_1;
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gUnknown_030008F8[bg].unk_2 = 0;
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gUnknown_030008F8[bg].unk_3 = 0;
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gUnknown_030008F8[bg].unk_4 = 0;
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gUnknown_030008F8[bg].unk_5 = 0;
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gUnknown_030008F8[bg].unk_6 = 0;
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}
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}
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void SetBgMode(u8 bgMode)
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{
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SetBgModeInternal(bgMode);
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}
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u16 LoadBgTiles(u8 bg, void *src, u16 size, u16 destOffset)
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{
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u16 unk;
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u8 cursor;
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if (GetBgControlAttribute(bg, 5) == 0)
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{
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unk = (gUnknown_030008F8[bg].unk_1 + destOffset) * 0x20;
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}
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else
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{
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unk = (gUnknown_030008F8[bg].unk_1 + destOffset) * 0x40;
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}
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cursor = LoadBgVram(bg, src, size, unk, DISPCNT_MODE_1);
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if (cursor == 0xFF)
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{
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return -1;
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}
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gUnknown_03000938[cursor >> 5] |= (1 << (cursor & 0x1F));
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if (gUnneededFireRedVariable == 1)
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{
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DummiedOutFireRedLeafGreenTileAllocFunc(bg, unk >> 5, size >> 5, 1);
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}
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return cursor;
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}
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u16 LoadBgTilemap(u8 bg, void *src, u16 size, u16 destOffset)
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{
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u8 cursor;
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cursor = LoadBgVram(bg, src, size, destOffset * 2, DISPCNT_MODE_2);
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if (cursor == 0xFF)
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{
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return -1;
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}
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gUnknown_03000938[cursor >> 5] |= (1 << (cursor & 0x1F));
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return cursor;
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}
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#ifdef NONMATCHING
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u16 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
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{
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u16 unk_1;
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s8 cursor;
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int cursor2;
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u32* ptr;
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if (IsInvalidBgDuplicate(bg) == FALSE)
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{
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unk_1 = (gUnknown_030008F8[bg].unk_2 * 0x20) + (destOffset * 2);
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cursor = RequestDma3Copy(src, (void*)(unk_1 + BG_PLTT), size, 0);
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cursor2 = cursor;
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}
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else
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{
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return -1;
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}
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if (cursor == -1)
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{
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return -1;
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}
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ptr = gUnknown_03000938;
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if (cursor < 0)
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{
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cursor2 += 0x1F;
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}
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cursor2 >>= 5;
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ptr[cursor2] |= (1 << (s8)(cursor - (cursor2 << 5)));
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return (u8)cursor;
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}
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#else
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__attribute__((naked))
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u8 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
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{
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asm("push {r4-r7,lr}\n\
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add r7, r1, #0\n\
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lsl r0, #24\n\
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lsr r4, r0, #24\n\
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lsl r2, #16\n\
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lsr r6, r2, #16\n\
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lsl r3, #16\n\
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lsr r5, r3, #16\n\
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add r0, r4, #0\n\
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bl IsInvalidBgDuplicate\n\
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cmp r0, #0\n\
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bne _08001A98\n\
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ldr r1, =gUnknown_030008F8\n\
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lsl r0, r4, #4\n\
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add r0, r1\n\
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ldrb r1, [r0, #0x1]\n\
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lsl r1, #26\n\
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lsr r1, #28\n\
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lsl r1, #5\n\
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lsl r0, r5, #1\n\
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add r1, r0\n\
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lsl r1, #16\n\
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lsr r1, #16\n\
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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
|
||||
Loading…
Reference in New Issue
Block a user