236 lines
7.4 KiB
C++
236 lines
7.4 KiB
C++
/*
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* Copyright 2016 - 2020 gary@drinkingtea.net
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <ox/fs/fs.hpp>
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#include <ox/mc/mc.hpp>
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#include <ox/std/std.hpp>
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#include <nostalgia/core/media.hpp>
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#include <nostalgia/core/gfx.hpp>
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#include "addresses.hpp"
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#include "bios.hpp"
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#include "irq.hpp"
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#include "gfx.hpp"
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namespace nostalgia::core {
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constexpr auto GbaTileColumns = 32;
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constexpr auto GbaTileRows = 32;
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constexpr uint16_t DispStat_irq_vblank = 1 << 3;
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constexpr uint16_t DispStat_irq_hblank = 1 << 4;
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constexpr uint16_t DispStat_irq_vcount = 1 << 5;
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struct GbaPaletteTarget {
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static constexpr auto TypeName = NostalgiaPalette::TypeName;
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static constexpr auto Fields = NostalgiaPalette::Fields;
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static constexpr auto TypeVersion = NostalgiaPalette::TypeVersion;
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volatile uint16_t *palette = nullptr;
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};
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struct GbaTileMapTarget {
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static constexpr auto TypeName = NostalgiaGraphic::TypeName;
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static constexpr auto Fields = NostalgiaGraphic::Fields;
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static constexpr auto TypeVersion = NostalgiaGraphic::TypeVersion;
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volatile uint32_t *bgCtl = nullptr;
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ox::FileAddress defaultPalette;
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GbaPaletteTarget pal;
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volatile uint16_t *tileMap = nullptr;
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};
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template<typename T>
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ox::Error modelRead(T *io, GbaPaletteTarget *t) {
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io->template setTypeInfo<GbaPaletteTarget>();
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auto colorHandler = [t](std::size_t i, Color16 *c) {
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t->palette[i] = *c;
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return OxError(0);
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};
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return io->template field<Color16, decltype(colorHandler)>("colors", colorHandler);
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}
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template<typename T>
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ox::Error modelRead(T *io, GbaTileMapTarget *t) {
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io->template setTypeInfo<GbaTileMapTarget>();
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uint8_t bpp;
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int dummy;
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oxReturnError(io->field("bpp", &bpp));
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oxReturnError(io->field("rows", &dummy));
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oxReturnError(io->field("columns", &dummy));
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constexpr auto Bpp8 = 1 << 7;
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*t->bgCtl = (28 << 8) | 1;
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if (bpp == 4) {
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*t->bgCtl |= (*t->bgCtl | Bpp8) ^ Bpp8; // set to use 4 bits per pixel
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} else {
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*t->bgCtl |= Bpp8; // set to use 8 bits per pixel
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}
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oxReturnError(io->field("defaultPalette", &t->defaultPalette));
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oxReturnError(io->field("pal", &t->pal));
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uint16_t intermediate = 0;
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auto handleTileMap = [t, &intermediate](std::size_t i, uint8_t *tile) {
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if (i & 1) { // i is odd
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intermediate |= static_cast<uint16_t>(*tile) << 8;
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t->tileMap[i / 2] = intermediate;
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} else { // i is even
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intermediate = *tile & 0x00ff;
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}
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return OxError(0);
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};
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return io->template field<uint8_t, decltype(handleTileMap)>("tileMap", handleTileMap);
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}
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ox::Error initGfx(Context*) {
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/* Sprite Mode ----\ */
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/* ---\| */
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/* Background 0 -\|| */
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/* Objects -----\||| */
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/* |||| */
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REG_DISPCTL = 0x1101;
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// tell display to trigger vblank interrupts
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REG_DISPSTAT |= DispStat_irq_vblank;
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// enable vblank interrupt
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REG_IE |= Int_vblank;
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return OxError(0);
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}
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ox::Error shutdownGfx(Context*) {
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return OxError(0);
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}
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[[nodiscard]] constexpr volatile uint32_t &bgCtl(int bg) noexcept {
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switch (bg) {
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case 0:
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return REG_BG0CTL;
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case 1:
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return REG_BG1CTL;
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case 2:
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return REG_BG2CTL;
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case 3:
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return REG_BG3CTL;
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default:
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oxPanic(OxError(1), "Looking up non-existent register");
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return REG_BG0CTL;
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}
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}
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// Do NOT rely on Context in the GBA version of this function.
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ox::Error initConsole(Context *ctx) {
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constexpr auto TilesheetAddr = "/TileSheets/Charset.ng";
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constexpr auto PaletteAddr = "/Palettes/Charset.npal";
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if (!ctx) {
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ctx = new (ox_alloca(sizeof(Context))) Context();
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auto rom = loadRom();
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if (!rom) {
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return OxError(1);
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}
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ox::FileStore32 fs(rom, 32 * ox::units::MB);
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ctx->rom = new (ox_alloca(sizeof(ox::FileSystem32))) ox::FileSystem32(fs);
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}
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return loadBgTileSheet(ctx, 0, TilesheetAddr, PaletteAddr);
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}
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ox::Error loadBgTileSheet(Context *ctx,
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int section,
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ox::FileAddress tilesheetAddr,
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ox::FileAddress paletteAddr) {
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auto [tsStat, tsStatErr] = ctx->rom->stat(tilesheetAddr);
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oxReturnError(tsStatErr);
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auto [ts, tserr] = ctx->rom->read(tilesheetAddr);
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oxReturnError(tserr);
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GbaTileMapTarget target;
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target.pal.palette = &MEM_BG_PALETTE[section];
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target.bgCtl = &bgCtl(section);
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target.tileMap = &ox::bit_cast<uint16_t*>(MEM_BG_TILES)[section * 512];
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oxReturnError(ox::readMC(ts, tsStat.size, &target));
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// load external palette if available
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if (paletteAddr) {
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auto [palStat, palStatErr] = ctx->rom->stat(paletteAddr);
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oxReturnError(palStatErr);
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auto [pal, palErr] = ctx->rom->read(paletteAddr);
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oxReturnError(palErr);
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oxReturnError(ox::readMC(pal, palStat.size, &target.pal));
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}
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return OxError(0);
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}
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ox::Error loadSpriteTileSheet(Context *ctx,
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int section,
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ox::FileAddress tilesheetAddr,
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ox::FileAddress paletteAddr) {
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auto [tsStat, tsStatErr] = ctx->rom->stat(tilesheetAddr);
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oxReturnError(tsStatErr);
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auto [ts, tserr] = ctx->rom->read(tilesheetAddr);
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oxReturnError(tserr);
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GbaTileMapTarget target;
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target.pal.palette = &MEM_SPRITE_PALETTE[section];
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target.bgCtl = &bgCtl(section);
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target.tileMap = &ox::bit_cast<uint16_t*>(MEM_SPRITE_TILES)[section * 512];
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oxReturnError(ox::readMC(ts, tsStat.size, &target));
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// load external palette if available
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if (paletteAddr) {
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auto [palStat, palStatErr] = ctx->rom->stat(paletteAddr);
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oxReturnError(palStatErr);
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auto [pal, palErr] = ctx->rom->read(paletteAddr);
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oxReturnError(palErr);
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oxReturnError(ox::readMC(pal, palStat.size, &target.pal));
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}
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return OxError(0);
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}
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ox::Error loadBgPalette(Context *ctx, int section, ox::FileAddress paletteAddr) {
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GbaPaletteTarget target;
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target.palette = &MEM_BG_PALETTE[section];
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auto [palStat, palStatErr] = ctx->rom->stat(paletteAddr);
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oxReturnError(palStatErr);
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auto [pal, palErr] = ctx->rom->read(paletteAddr);
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oxReturnError(palErr);
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oxReturnError(ox::readMC(pal, palStat.size, &target));
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return OxError(0);
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}
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ox::Error loadSpritePalette(Context *ctx, int section, ox::FileAddress paletteAddr) {
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GbaPaletteTarget target;
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target.palette = &MEM_SPRITE_PALETTE[section];
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auto [palStat, palStatErr] = ctx->rom->stat(paletteAddr);
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oxReturnError(palStatErr);
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auto [pal, palErr] = ctx->rom->read(paletteAddr);
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oxReturnError(palErr);
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oxReturnError(ox::readMC(pal, palStat.size, &target));
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return OxError(0);
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}
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// Do NOT use Context in the GBA version of this function.
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void setTile(Context*, int layer, int column, int row, uint8_t tile) {
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MEM_BG_MAP[layer][row * GbaTileColumns + column] = tile;
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}
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// Do NOT use Context in the GBA version of this function.
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void clearTileLayer(Context*, int layer) {
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memset(&MEM_BG_MAP[layer], 0, GbaTileRows * GbaTileColumns);
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}
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void setSprite(unsigned idx, unsigned x, unsigned y, unsigned tileIdx) {
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GbaSpriteAttrUpdate oa;
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oa.attr0 = static_cast<uint16_t>(y & ox::onMask<uint8_t>(7))
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| (static_cast<uint16_t>(1) << 10); // enable alpha
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oa.attr1 = static_cast<uint16_t>(x) & ox::onMask<uint8_t>(8);
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oa.attr2 = static_cast<uint16_t>(tileIdx & ox::onMask<uint16_t>(8));
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oa.idx = idx;
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// block until g_spriteUpdates is less than buffer len
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if (g_spriteUpdates >= config::GbaSpriteBufferLen) {
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nostalgia_core_vblankwfi();
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}
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REG_IE &= ~Int_vblank; // disable vblank interrupt handler
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g_spriteBuffer[g_spriteUpdates++] = oa;
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REG_IE |= Int_vblank; // enable vblank interrupt handler
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}
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}
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