102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
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#include "render/scene.h"
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namespace
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{
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// Запас за краями кадра, чтобы не отсекать спрайты, торчащие внутрь.
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constexpr int CULL_MARGIN_X = TILE_W;
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constexpr int CULL_MARGIN_Y = WALL_H + TILE_H;
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inline bool OffScreen(int sx, int sy)
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{
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return sx < -CULL_MARGIN_X || sx > INTERNAL_W + CULL_MARGIN_X ||
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sy < -CULL_MARGIN_Y || sy > INTERNAL_H + CULL_MARGIN_Y;
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}
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} // namespace
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void Scene::Begin(const iso::Camera& cam)
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{
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items.clear();
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cam.ScreenOffset(ox, oy);
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}
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void Scene::Add(const Sprite* spr, Vec2 world, int pixelLift, float depthBias)
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{
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const Vec2 s = iso::WorldToScreen(world);
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const int sx = int(std::lround(s.x)) + ox;
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const int sy = int(std::lround(s.y)) + oy - pixelLift;
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if (OffScreen(sx, sy)) return;
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iso::DrawItem it;
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it.depth = iso::Depth(world) + depthBias;
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it.spr = spr;
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it.x = sx;
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it.y = sy;
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items.push_back(it);
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}
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void Scene::AddShaded(const Sprite* spr, Vec2 world, const ShadeQuad& quad, int pixelLift,
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float depthBias)
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{
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const Vec2 s = iso::WorldToScreen(world);
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const int sx = int(std::lround(s.x)) + ox;
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const int sy = int(std::lround(s.y)) + oy - pixelLift;
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if (OffScreen(sx, sy)) return;
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iso::DrawItem it;
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it.depth = iso::Depth(world) + depthBias;
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it.spr = spr;
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it.x = sx;
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it.y = sy;
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it.shaded = true;
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it.quad = quad;
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items.push_back(it);
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}
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void Scene::Flush(Framebuffer& fb)
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{
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iso::SortByDepth(items);
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iso::FlushDrawList(fb, items);
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}
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// Ниже этого уровня рампа даёт ступень 0, то есть чистый чёрный.
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static const float DARK_CUTOFF = 0.5f / float(RAMP_LEVELS - 1);
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void DrawFloor(Framebuffer& fb, const SpriteSet& sprites, const Tilemap& map, int ox, int oy,
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const Lighting& light, const BloodField* blood)
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{
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for (int ty = 0; ty < MAP_H; ++ty)
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{
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for (int tx = 0; tx < MAP_W; ++tx)
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{
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if (map.IsWall(tx, ty)) continue; // под стеной пол не виден
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if (light.MaxCornerOf(tx, ty) < DARK_CUTOFF) continue;
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const Vec2 c = iso::WorldToScreen({tx + 0.5f, ty + 0.5f});
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const int sx = int(std::lround(c.x)) + ox;
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const int sy = int(std::lround(c.y)) + oy;
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if (OffScreen(sx, sy)) continue;
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const Sprite* stained = blood ? blood->At(tx, ty) : nullptr;
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const Sprite& s = stained ? *stained : sprites.FloorTile(tx, ty);
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fb.BlitShaded(s, sx, sy, light.QuadFor(tx, ty, TILE_H - 1));
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}
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}
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}
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void CollectWalls(Scene& scene, const SpriteSet& sprites, const Tilemap& map,
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const Lighting& light)
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{
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for (int ty = 0; ty < MAP_H; ++ty)
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for (int tx = 0; tx < MAP_W; ++tx)
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{
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if (!map.IsWall(tx, ty)) continue;
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if (light.MaxCornerOf(tx, ty) < DARK_CUTOFF) continue;
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// clampRow = TILE_H-1: вертикальные грани светятся как нижняя кромка
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// крыши, а не как экстраполяция патча на 32 строки вниз.
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scene.AddShaded(&sprites.wall, {tx + 0.5f, ty + 0.5f},
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light.QuadFor(tx, ty, TILE_H - 1));
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}
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}
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