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#include "scene.hpp"
Scene::Scene() {
directional_light = {0, 0, -1};
viewport_dimension = {2, 3};
scene_dimension = {SCREEN_WIDTH / 2, SCREEN_HEIGHT};
z_plane = int2fx(1);
}
POINT Scene::project_2d(VECTOR vertex) {
POINT pt = {0, 0};
if (vertex.z != 0) {
pt.x = fxdiv(z_plane, vertex.z);
pt.y = fxmul(vertex.y, pt.x);
pt.x = fxmul(vertex.x, pt.x);
}
return pt;
}
POINT Scene::viewport_to_scene(POINT p) {
FIXED x = fxmul(
p.x, (std::get<0>(scene_dimension) / std::get<0>(viewport_dimension))
<< FIX_SHIFT);
FIXED y = fxmul(
p.y, (std::get<1>(scene_dimension) / std::get<1>(viewport_dimension))
<< FIX_SHIFT);
return {x, y};
}
void Scene::draw_line(POINT p0, POINT p1, std::uint8_t pal_idx) {
POINT scene_p0 = viewport_to_scene(p0);
POINT scene_p1 = viewport_to_scene(p1);
std::uint16_t pixels = (pal_idx << 8) | pal_idx;
bmp16_line(scene_p0.x, scene_p0.y, scene_p1.x, scene_p1.y, pixels, vid_page,
M4_WIDTH);
}
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