250 lines
8.0 KiB
C++
250 lines
8.0 KiB
C++
#ifndef GRID3_HPP
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#define GRID3_HPP
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#include <unordered_map>
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#include "../vectorlogic/vec3.hpp"
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#include "../vectorlogic/vec4.hpp"
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#include "../timing_decorator.hpp"
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#include "../output/frame.hpp"
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#include "../noise/pnoise2.hpp"
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#include "../vecmat/mat4.hpp"
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#include <vector>
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#include <algorithm>
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#include "../basicdefines.hpp"
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struct Voxel {
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//float active;
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bool active;
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//Vec3f position;
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Vec3ui8 color;
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};
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struct Camera {
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Ray3f posfor;
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Vec3f up;
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float fov;
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Camera(Vec3f pos, Vec3f viewdir, Vec3f up, float fov = 80) : posfor(Ray3f(pos, viewdir)), up(up), fov(fov) {}
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};
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class VoxelGrid {
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private:
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double binSize = 1;
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Vec3T gridSize;
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//size_t width, height, depth;
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std::vector<Voxel> voxels;
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float radians(float rads) {
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return rads * (M_PI / 180);
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}
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static Mat4f lookAt(const Vec3f& eye, const Vec3f& center, const Vec3f& up) {
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Vec3f const f = (center - eye).normalized();
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Vec3f const s = f.cross(up).normalized();
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Vec3f const u = s.cross(f);
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Mat4f Result = Mat4f::identity();
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Result(0, 0) = s.x;
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Result(1, 0) = s.y;
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Result(2, 0) = s.z;
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Result(3, 0) = -s.dot(eye);
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Result(0, 1) = u.x;
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Result(1, 1) = u.y;
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Result(2, 1) = u.z;
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Result(3, 1) = -u.dot(eye);
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Result(0, 2) = -f.x;
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Result(1, 2) = -f.y;
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Result(2, 2) = -f.z;
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Result(3, 2) = f.dot(eye);
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return Result;
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}
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static Mat4f perspective(float fovy, float aspect, float zNear, float zfar) {
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float const tanhalfF = tan(fovy / 2);
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Mat4f Result = 0;
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Result(0,0) = 1 / (aspect * tanhalfF);
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Result(1,1) = 1 / tanhalfF;
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Result(2,2) = zfar / (zNear - zfar);
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Result(2,3) = -1;
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Result(3,2) = -(zfar * zNear) / (zfar - zNear);
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return Result;
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}
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public:
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VoxelGrid(size_t w, size_t h, size_t d) : gridSize(w,h,d) {
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voxels.resize(w * h * d);
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}
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Voxel& get(size_t x, size_t y, size_t z) {
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return voxels[z * gridSize.x * gridSize.y + y * gridSize.x + x];
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}
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const Voxel& get(size_t x, size_t y, size_t z) const {
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return voxels[z * gridSize.x * gridSize.y + y * gridSize.x + x];
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}
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Voxel& get(const Vec3T& xyz) {
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return voxels[xyz.z * gridSize.x * gridSize.y + xyz.y * gridSize.x + xyz.x];
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}
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void resize() {
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//TODO: proper resizing
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}
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void set(size_t x, size_t y, size_t z, bool active, Vec3ui8 color) {
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set(Vec3T(x,y,z), active, color);
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}
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void set(Vec3T pos, bool active, Vec3ui8 color) {
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if (pos.x >= 0 || pos.y >= 0 || pos.z >= 0) {
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if (!(pos.x < gridSize.x)) {
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//until resizing added:
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return;
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gridSize.x = pos.x;
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resize();
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}
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else if (!(pos.y < gridSize.y)) {
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//until resizing added:
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return;
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gridSize.y = pos.y;
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resize();
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}
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else if (!(pos.z < gridSize.z)) {
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//until resizing added:
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return;
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gridSize.z = pos.z;
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resize();
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}
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Voxel& v = get(pos);
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v.active = active; // std::clamp(active, 0.0f, 1.0f);
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v.color = color;
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}
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}
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void set(Vec3T pos, Vec4ui8 rgbaval) {
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set(pos, static_cast<float>(rgbaval.a / 255), rgbaval.toVec3());
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}
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template<typename T>
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bool inGrid(Vec3<T> voxl) {
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return (voxl >= 0 && voxl.x < gridSize.x && voxl.y < gridSize.y && voxl.z < gridSize.z);
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}
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void voxelTraverse(const Vec3d& origin, const Vec3d& end, std::vector<Vec3T>& visitedVoxel) {
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Vec3T cv = (origin / binSize).floorToT();
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Vec3T lv = (end / binSize).floorToT();
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Vec3d ray = end - origin;
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Vec3f step = Vec3f(ray.x >= 0 ? 1 : -1, ray.y >= 0 ? 1 : -1, ray.z >= 0 ? 1 : -1);
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Vec3d nextVox = cv.toDouble() + step * binSize;
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Vec3d tMax = Vec3d(ray.x != 0 ? (nextVox.x - origin.x) / ray.x : INF,
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ray.y != 0 ? (nextVox.y - origin.y) / ray.y : INF,
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ray.z != 0 ? (nextVox.z-origin.z) / ray.z : INF);
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Vec3d tDelta = Vec3d(ray.x != 0 ? binSize / ray.x * step.x : INF,
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ray.y != 0 ? binSize / ray.y * step.y : INF,
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ray.z != 0 ? binSize / ray.z * step.z : INF);
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Vec3T diff(0,0,0);
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bool negRay = false;
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if (cv.x != lv.x && ray.x < 0) {
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diff.x = diff.x--;
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negRay = true;
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}
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if (cv.y != lv.y && ray.y < 0) {
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diff.y = diff.y--;
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negRay = true;
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}
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if (cv.z != lv.z && ray.z < 0) {
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diff.z = diff.z--;
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negRay = true;
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}
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if (negRay) {
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cv += diff;
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visitedVoxel.push_back(cv);
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}
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while (lv != cv && inGrid(cv)) {
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if (get(cv).active) {
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visitedVoxel.push_back(cv);
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}
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if (tMax.x < tMax.y) {
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if (tMax.x < tMax.z) {
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cv.x += step.x;
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tMax.x += tDelta.x;
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} else {
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cv.z += step.z;
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tMax.z += tDelta.z;
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}
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} else {
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if (tMax.y < tMax.z) {
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cv.y += step.y;
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tMax.y += tDelta.y;
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} else {
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cv.z += step.z;
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tMax.z += tDelta.z;
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}
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}
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}
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return; // &&visitedVoxel;
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}
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size_t getWidth() const {
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return gridSize.x;
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}
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size_t getHeight() const {
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return gridSize.y;
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}
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size_t getDepth() const {
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return gridSize.z;
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}
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frame renderFrame(const Vec3f& CamPos, const Vec3f& dir, const Vec3f& up, float fov, size_t outW, size_t outH) {
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TIME_FUNCTION;
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Vec3f forward = (dir - CamPos).normalized();
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Vec3f right = forward.cross(up).normalized();
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Vec3f upCor = right.cross(forward).normalized();
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float aspect = static_cast<float>(outW) / static_cast<float>(outH);
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float fovRad = radians(fov);
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float viewH = 2 * tan(fovRad / 2);
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float viewW = viewH * aspect;
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float maxDist = std::sqrt(gridSize.lengthSquared()) * binSize;
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frame outFrame(outH, outW, frame::colormap::RGB);
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std::vector<uint8_t> colorBuffer(outW * outH * 3);
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#pragma omp parallel for
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for (size_t y = 0; y < outH; y++) {
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float v = (static_cast<float>(y) / static_cast<float>(outH - 1)) - 0.5f;
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for (size_t x = 0; x < outW; x++) {
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std::vector<Vec3T> hitVoxels;
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float u = (static_cast<float>(x) / static_cast<float>(outW - 1)) - 0.5f;
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Vec3f rayDirWorld = (forward + right * (u * viewW) + upCor * (v * viewH)).normalized();
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Vec3f rayEnd = CamPos + rayDirWorld * maxDist;
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Vec3d rayStartGrid = CamPos.toDouble() / binSize;
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Vec3d rayEndGrid = rayEnd.toDouble() / binSize;
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voxelTraverse(rayStartGrid, rayEndGrid, hitVoxels);
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Vec3ui8 hitColor(10, 10, 255);
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for (const Vec3T& voxelPos : hitVoxels) {
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if (inGrid(voxelPos)) {
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const Voxel& voxel = get(voxelPos);
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if (voxel.active) {
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hitColor = voxel.color;
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break;
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}
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}
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}
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hitVoxels.clear();
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hitVoxels.shrink_to_fit();
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// Set pixel color in buffer
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size_t idx = (y * outW + x) * 3;
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colorBuffer[idx + 0] = hitColor.x;
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colorBuffer[idx + 1] = hitColor.y;
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colorBuffer[idx + 2] = hitColor.z;
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}
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}
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outFrame.setData(colorBuffer);
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return outFrame;
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}
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};
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#endif
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