8bc896265f
- Updated SetTileAt and GetTileAt methods to enhance boundary checks, ensuring valid tile coordinates are used. - Simplified buffer resizing logic in DrawBackground to accurately reflect the number of tiles based on width and height. - Improved tile drawing logic to prevent unnecessary operations when the tile value is 0xFFFF, enhancing rendering efficiency.
120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
#include "app/gfx/background_buffer.h"
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#include <algorithm>
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#include <cstdint>
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#include <vector>
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#include "app/gfx/bitmap.h"
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#include "app/gfx/snes_tile.h"
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namespace yaze::gfx {
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BackgroundBuffer::BackgroundBuffer(int width, int height)
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: width_(width), height_(height) {
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// Initialize buffer with size for SNES layers
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const int total_tiles = (width / 8) * (height / 8);
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buffer_.resize(total_tiles, 0);
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}
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void BackgroundBuffer::SetTileAt(int x, int y, uint16_t value) {
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if (x < 0 || y < 0) return;
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int tiles_w = width_ / 8;
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int tiles_h = height_ / 8;
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if (x >= tiles_w || y >= tiles_h) return;
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buffer_[y * tiles_w + x] = value;
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}
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uint16_t BackgroundBuffer::GetTileAt(int x, int y) const {
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int tiles_w = width_ / 8;
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int tiles_h = height_ / 8;
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if (x < 0 || y < 0 || x >= tiles_w || y >= tiles_h) return 0;
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return buffer_[y * tiles_w + x];
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}
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void BackgroundBuffer::ClearBuffer() { std::ranges::fill(buffer_, 0); }
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void BackgroundBuffer::DrawTile(const TileInfo& tile, uint8_t* canvas,
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const uint8_t* tiledata, int indexoffset) {
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int tx = (tile.id_ / 16 * 512) + ((tile.id_ & 0xF) * 4);
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uint8_t palnibble = (uint8_t)(tile.palette_ << 4);
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uint8_t r = tile.horizontal_mirror_ ? 1 : 0;
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for (int yl = 0; yl < 512; yl += 64) {
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int my = indexoffset + (tile.vertical_mirror_ ? 448 - yl : yl);
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for (int xl = 0; xl < 4; xl++) {
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int mx = 2 * (tile.horizontal_mirror_ ? 3 - xl : xl);
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uint8_t pixel = tiledata[tx + yl + xl];
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int index = mx + my;
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canvas[index + r ^ 1] = (uint8_t)((pixel & 0x0F) | palnibble);
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canvas[index + r] = (uint8_t)((pixel >> 4) | palnibble);
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}
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}
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}
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void BackgroundBuffer::DrawBackground(std::span<uint8_t> gfx16_data) {
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// Initialize bitmap
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bitmap_.Create(width_, height_, 8, std::vector<uint8_t>(width_ * height_, 0));
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int tiles_w = width_ / 8;
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int tiles_h = height_ / 8;
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if ((int)buffer_.size() < tiles_w * tiles_h) {
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buffer_.resize(tiles_w * tiles_h);
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}
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// For each tile on the tile buffer
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for (int yy = 0; yy < tiles_h; yy++) {
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for (int xx = 0; xx < tiles_w; xx++) {
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uint16_t word = buffer_[xx + yy * tiles_w];
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// Prevent draw if tile == 0xFFFF since it's 0 indexed
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if (word == 0xFFFF) continue;
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auto tile = gfx::WordToTileInfo(word);
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DrawTile(tile, bitmap_.mutable_data().data(), gfx16_data.data(),
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(yy * 512) + (xx * 8));
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}
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}
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}
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void BackgroundBuffer::DrawFloor(const std::vector<uint8_t>& rom_data,
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int tile_address, int tile_address_floor,
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uint8_t floor_graphics) {
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auto f = (uint8_t)(floor_graphics << 4);
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// Create floor tiles from ROM data
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gfx::TileInfo floorTile1(rom_data[tile_address + f],
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rom_data[tile_address + f + 1]);
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gfx::TileInfo floorTile2(rom_data[tile_address + f + 2],
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rom_data[tile_address + f + 3]);
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gfx::TileInfo floorTile3(rom_data[tile_address + f + 4],
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rom_data[tile_address + f + 5]);
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gfx::TileInfo floorTile4(rom_data[tile_address + f + 6],
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rom_data[tile_address + f + 7]);
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gfx::TileInfo floorTile5(rom_data[tile_address_floor + f],
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rom_data[tile_address_floor + f + 1]);
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gfx::TileInfo floorTile6(rom_data[tile_address_floor + f + 2],
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rom_data[tile_address_floor + f + 3]);
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gfx::TileInfo floorTile7(rom_data[tile_address_floor + f + 4],
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rom_data[tile_address_floor + f + 5]);
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gfx::TileInfo floorTile8(rom_data[tile_address_floor + f + 6],
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rom_data[tile_address_floor + f + 7]);
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// Draw the floor tiles in a pattern
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for (int xx = 0; xx < 16; xx++) {
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for (int yy = 0; yy < 32; yy++) {
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SetTileAt((xx * 4), (yy * 2), floorTile1.id_);
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SetTileAt((xx * 4) + 1, (yy * 2), floorTile2.id_);
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SetTileAt((xx * 4) + 2, (yy * 2), floorTile3.id_);
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SetTileAt((xx * 4) + 3, (yy * 2), floorTile4.id_);
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SetTileAt((xx * 4), (yy * 2) + 1, floorTile5.id_);
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SetTileAt((xx * 4) + 1, (yy * 2) + 1, floorTile6.id_);
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SetTileAt((xx * 4) + 2, (yy * 2) + 1, floorTile7.id_);
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SetTileAt((xx * 4) + 3, (yy * 2) + 1, floorTile8.id_);
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}
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}
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}
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} // namespace yaze::gfx
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