mirror of
https://github.com/DarkflameUniverse/DarkflameServer.git
synced 2026-10-02 10:53:44 +00:00
c39b7ee935
Player models are multishader (RenderComponent shader 100): the client wraps each NiLODNode and draws it with the mapShaders id in its name. With shader_metal, shader_brushed or shader_glow set, the opaque bricks are split by look into S<id>_Metal_Model, S<id>_Brushed_Model and S<id>_Glow_Model beside S01_Opaque_Model and S01_Alpha_Model, each with every LOD level. Metal is LU Toolbox's metallic colors plus Materials.xml types (shinySteel; brushedSteel and matteSteel for brushed), glow its glow colors. Glow shapes get an emissive material (glow_emissive) and their plain color, not the baked one. Transparent glow stays in S01_Alpha. All off by default, which writes the same bytes as before (tested). Not how live looked; models already made change only when made again. The icon renderer reads the groups back by tag and draws glow at its plain color and metal with a tinted reflection and highlight. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
571 lines
27 KiB
C++
571 lines
27 KiB
C++
#include "UgcRender.h"
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#include <algorithm>
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#include <cmath>
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#include <limits>
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#include <numeric>
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#include <unordered_map>
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#include <glm/gtc/matrix_transform.hpp>
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#include "UgcIconPose.h"
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#include "UgcPalette.h"
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#include "UgcThrottle.h"
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namespace {
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constexpr float INF = std::numeric_limits<float>::infinity();
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float Edge(const glm::vec3& a, const glm::vec3& b, float px, float py) {
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return (b.x - a.x) * (py - a.y) - (b.y - a.y) * (px - a.x);
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}
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// Calls fragment(x, y, z, w0, w1, w2) for every pixel centre inside the screen-space triangle (x, y in pixels)
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template<typename Fragment>
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void Rasterize(int width, int height, const glm::vec3& a, const glm::vec3& b, const glm::vec3& c, Fragment&& fragment) {
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const float area = Edge(a, b, c.x, c.y);
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if (!(std::abs(area) > 1e-9f)) return;
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const float inverse = 1.0f / area;
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const int minX = std::max(0, static_cast<int>(std::floor(std::min({ a.x, b.x, c.x }))));
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const int maxX = std::min(width - 1, static_cast<int>(std::ceil(std::max({ a.x, b.x, c.x }))));
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const int minY = std::max(0, static_cast<int>(std::floor(std::min({ a.y, b.y, c.y }))));
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const int maxY = std::min(height - 1, static_cast<int>(std::ceil(std::max({ a.y, b.y, c.y }))));
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for (int y = minY; y <= maxY; y++) {
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const float py = y + 0.5f;
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for (int x = minX; x <= maxX; x++) {
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const float px = x + 0.5f;
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const float w0 = Edge(b, c, px, py) * inverse;
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const float w1 = Edge(c, a, px, py) * inverse;
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const float w2 = 1.0f - w0 - w1;
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if (w0 < 0.0f || w1 < 0.0f || w2 < 0.0f) continue;
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fragment(x, y, w0 * a.z + w1 * b.z + w2 * c.z, w0, w1, w2);
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}
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}
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}
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float ToLinear(float c) { return UgcPalette::SrgbToLinear(std::clamp(c, 0.0f, 1.0f)); }
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float ToSrgb(float c) { return UgcPalette::LinearToSrgb(std::clamp(c, 0.0f, 1.0f)); }
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// A bounding volume hierarchy over a mesh's triangles, for the occlusion rays
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class Bvh {
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public:
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explicit Bvh(const UgcModel::Mesh& mesh) : m_Mesh(mesh) {
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const size_t count = mesh.TriangleCount();
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m_Order.resize(count);
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std::iota(m_Order.begin(), m_Order.end(), 0u);
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m_Centers.resize(count);
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for (size_t t = 0; t < count; t++) m_Centers[t] = (Vertex(t, 0) + Vertex(t, 1) + Vertex(t, 2)) / 3.0f;
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if (count > 0) Build(0, static_cast<uint32_t>(count));
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Flatten();
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}
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// Whether a ray from `origin` along `direction` (unit) hits a triangle nearer than `maxDistance`
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bool Hits(const glm::vec3& origin, const glm::vec3& direction, float maxDistance) const {
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if (m_Nodes.empty()) return false;
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const glm::vec3 inverse(1.0f / (std::abs(direction.x) > 1e-12f ? direction.x : 1e-12f), 1.0f / (std::abs(direction.y) > 1e-12f ? direction.y : 1e-12f),
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1.0f / (std::abs(direction.z) > 1e-12f ? direction.z : 1e-12f));
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uint32_t stack[64];
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int top = 0;
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stack[top++] = 0;
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while (top > 0) {
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const auto& node = m_Nodes[stack[--top]];
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if (!BoxHit(node, origin, inverse, maxDistance)) continue;
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if (node.count > 0) {
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for (uint32_t i = node.first; i < node.first + node.count; i++) {
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if (TriangleHit(m_Triangles[i], origin, direction, maxDistance)) return true;
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}
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} else if (top < 62) {
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stack[top++] = node.first;
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stack[top++] = node.first + 1;
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}
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}
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return false;
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}
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private:
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struct Node {
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glm::vec3 min{};
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glm::vec3 max{};
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uint32_t first{}; // leaf: first triangle in m_Order; inner: the first of two children
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uint32_t count{}; // triangles, 0 for inner nodes
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};
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glm::vec3 Vertex(size_t t, int k) const { return m_Mesh.positions[m_Mesh.indices[t * 3 + k]]; }
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void Build(uint32_t first, uint32_t count) {
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// Iterative, so deep trees don't use the stack
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struct Task { uint32_t node, first, count; };
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m_Nodes.push_back({});
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std::vector<Task> tasks{ { 0, first, count } };
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while (!tasks.empty()) {
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const auto task = tasks.back();
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tasks.pop_back();
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Node node;
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node.min = glm::vec3(INF);
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node.max = glm::vec3(-INF);
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glm::vec3 centerMin(INF), centerMax(-INF);
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for (uint32_t i = task.first; i < task.first + task.count; i++) {
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for (int k = 0; k < 3; k++) {
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node.min = glm::min(node.min, Vertex(m_Order[i], k));
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node.max = glm::max(node.max, Vertex(m_Order[i], k));
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}
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centerMin = glm::min(centerMin, m_Centers[m_Order[i]]);
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centerMax = glm::max(centerMax, m_Centers[m_Order[i]]);
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}
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const auto extent = centerMax - centerMin;
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const int axis = extent.x >= extent.y && extent.x >= extent.z ? 0 : extent.y >= extent.z ? 1 : 2;
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if (task.count <= 4 || extent[axis] <= 0.0f) {
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node.first = task.first;
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node.count = task.count;
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m_Nodes[task.node] = node;
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continue;
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}
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const uint32_t half = task.count / 2;
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auto* begin = m_Order.data() + task.first;
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std::nth_element(begin, begin + half, begin + task.count, [&](uint32_t a, uint32_t b) { return m_Centers[a][axis] < m_Centers[b][axis]; });
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node.first = static_cast<uint32_t>(m_Nodes.size());
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node.count = 0;
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m_Nodes[task.node] = node;
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m_Nodes.push_back({});
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m_Nodes.push_back({});
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tasks.push_back({ node.first, task.first, half });
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tasks.push_back({ node.first + 1, task.first + half, task.count - half });
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}
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}
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static bool BoxHit(const Node& node, const glm::vec3& origin, const glm::vec3& inverse, float maxDistance) {
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const auto t0 = (node.min - origin) * inverse;
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const auto t1 = (node.max - origin) * inverse;
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const auto near = glm::min(t0, t1), far = glm::max(t0, t1);
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const float enter = std::max(std::max(near.x, near.y), std::max(near.z, 0.0f));
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const float exit = std::min(std::min(far.x, far.y), std::min(far.z, maxDistance));
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return enter <= exit;
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}
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struct Triangle {
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glm::vec3 a, e1, e2;
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};
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// The triangles in leaf order, edges worked out once (the rays read them far more often than the tree is built)
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void Flatten() {
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m_Triangles.reserve(m_Order.size());
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for (const auto t : m_Order) {
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const auto a = Vertex(t, 0);
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m_Triangles.push_back({ a, Vertex(t, 1) - a, Vertex(t, 2) - a });
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}
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}
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static bool TriangleHit(const Triangle& triangle, const glm::vec3& origin, const glm::vec3& direction, float maxDistance) {
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const auto& a = triangle.a;
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const auto& e1 = triangle.e1;
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const auto& e2 = triangle.e2;
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const auto p = glm::cross(direction, e2);
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const float det = glm::dot(e1, p);
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if (std::abs(det) < 1e-12f) return false;
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const float inv = 1.0f / det;
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const auto s = origin - a;
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const float u = glm::dot(s, p) * inv;
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if (u < 0.0f || u > 1.0f) return false;
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const auto q = glm::cross(s, e1);
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const float v = glm::dot(direction, q) * inv;
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if (v < 0.0f || u + v > 1.0f) return false;
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const float distance = glm::dot(e2, q) * inv;
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return distance > 1e-4f && distance < maxDistance;
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}
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const UgcModel::Mesh& m_Mesh;
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std::vector<Triangle> m_Triangles;
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std::vector<uint32_t> m_Order;
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std::vector<glm::vec3> m_Centers;
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std::vector<Node> m_Nodes;
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};
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float RadicalInverse(uint32_t bits) {
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bits = (bits << 16u) | (bits >> 16u);
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bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
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bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
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bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
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bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
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return static_cast<float>(bits) * 2.3283064365386963e-10f;
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}
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// Looking at a sphere (center, radius) from direction `dir` (towards the viewer), square orthographic view
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struct OrthoView {
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glm::vec3 center{};
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glm::vec3 dir{};
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glm::vec3 right{};
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glm::vec3 up{};
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float radius{};
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int resolution{};
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OrthoView(const glm::vec3& center_, float radius_, const glm::vec3& dir_, int resolution_)
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: center(center_), dir(dir_), radius(radius_), resolution(resolution_) {
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const glm::vec3 worldUp = std::abs(dir.y) < 0.99f ? glm::vec3(0.0f, 1.0f, 0.0f) : glm::vec3(1.0f, 0.0f, 0.0f);
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right = glm::normalize(glm::cross(worldUp, dir));
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up = glm::cross(dir, right);
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}
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// x, y in pixels; z the distance from the camera plane (smaller is nearer)
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glm::vec3 Project(const glm::vec3& p) const {
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const auto offset = p - center;
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const float scale = 0.5f * resolution / radius;
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return { resolution * 0.5f + glm::dot(offset, right) * scale, resolution * 0.5f - glm::dot(offset, up) * scale, radius - glm::dot(offset, dir) };
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}
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float PixelSize() const { return 2.0f * radius / resolution; }
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};
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void Bounds(const UgcModel::Model& model, glm::vec3& center, float& radius) {
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glm::vec3 min{}, max{};
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if (!model.Bounds(min, max)) {
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center = glm::vec3(0.0f);
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radius = 1.0f;
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return;
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}
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center = (min + max) * 0.5f;
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radius = std::max(glm::length(max - min) * 0.5f, 0.01f);
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}
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}
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namespace UgcRender {
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std::vector<glm::vec3> SphereDirections() {
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const float t = (1.0f + std::sqrt(5.0f)) / 2.0f;
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const std::vector<glm::vec3> corners = {
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{ -1, t, 0 }, { 1, t, 0 }, { -1, -t, 0 }, { 1, -t, 0 },
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{ 0, -1, t }, { 0, 1, t }, { 0, -1, -t }, { 0, 1, -t },
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{ t, 0, -1 }, { t, 0, 1 }, { -t, 0, -1 }, { -t, 0, 1 },
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};
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std::vector<glm::vec3> directions;
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for (const auto& corner : corners) directions.push_back(glm::normalize(corner));
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// Edge centres: the pairs of corners that are neighbours (the shortest distance apart)
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const float edge = glm::length(corners[0] - corners[1]);
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for (size_t i = 0; i < corners.size(); i++) {
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for (size_t j = i + 1; j < corners.size(); j++) {
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if (std::abs(glm::length(corners[i] - corners[j]) - edge) < 1e-3f) directions.push_back(glm::normalize(corners[i] + corners[j]));
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}
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}
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return directions;
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}
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OptimizeResult Optimize(UgcModel::Model& model, const OptimizeOptions& options) {
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OptimizeResult result;
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auto& opaque = model.opaque;
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result.trianglesBefore = opaque.TriangleCount() + model.transparent.TriangleCount();
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if (opaque.Empty() || !options.removeHidden) return result;
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glm::vec3 center{};
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float radius{};
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Bounds(model, center, radius);
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radius *= 1.02f;
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const int resolution = std::clamp(options.resolution, 64, 4096);
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const size_t pixels = static_cast<size_t>(resolution) * resolution;
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std::vector<float> depth(pixels);
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std::vector<uint32_t> ids(pixels);
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std::vector<glm::vec3> screen(opaque.positions.size());
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const size_t triangles = opaque.TriangleCount();
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std::vector<bool> visible(triangles, false);
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std::vector<bool> facing(triangles, true);
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std::vector<glm::vec3> faceNormals(triangles, glm::vec3(0.0f));
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for (size_t t = 0; t < triangles; t++) {
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if (opaque.normals.size() != opaque.positions.size()) break;
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faceNormals[t] = glm::normalize(opaque.normals[opaque.indices[t * 3]] + opaque.normals[opaque.indices[t * 3 + 1]] + opaque.normals[opaque.indices[t * 3 + 2]] + glm::vec3(1e-6f));
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}
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// Without normals nothing is culled
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if (opaque.normals.size() != opaque.positions.size()) std::fill(faceNormals.begin(), faceNormals.end(), glm::vec3(0.0f));
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for (const auto& direction : SphereDirections()) {
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// A ground plane under the model hides everything from below
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if (options.groundPlane && direction.y < -0.05f) continue;
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UgcThrottle::Checkpoint();
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const OrthoView view(center, radius, direction, resolution);
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const float bias = view.PixelSize();
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std::fill(depth.begin(), depth.end(), INF);
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std::fill(ids.begin(), ids.end(), 0);
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for (size_t v = 0; v < opaque.positions.size(); v++) screen[v] = view.Project(opaque.positions[v]);
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// Faces turned away can't be seen from here (they're seen from the directions they face); their vertex
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// normals say which way they face, which doesn't depend on the files' winding
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for (size_t t = 0; t < triangles; t++) facing[t] = glm::dot(faceNormals[t], direction) > -0.1f;
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for (size_t t = 0; t < triangles; t++) {
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if (!facing[t]) continue;
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if ((t & 0x3FFF) == 0) UgcThrottle::Checkpoint();
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const auto id = static_cast<uint32_t>(t + 1);
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Rasterize(resolution, resolution, screen[opaque.indices[t * 3]], screen[opaque.indices[t * 3 + 1]], screen[opaque.indices[t * 3 + 2]],
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[&](int x, int y, float z, float, float, float) {
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auto& stored = depth[static_cast<size_t>(y) * resolution + x];
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if (z < stored) {
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stored = z;
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ids[static_cast<size_t>(y) * resolution + x] = id;
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}
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});
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}
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for (const auto id : ids) {
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if (id != 0) visible[id - 1] = true;
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}
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// Triangles too small or thin to cover a pixel centre: kept when their centre isn't behind what was drawn.
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// Bigger ones that show would have covered one.
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const float smallArea = 2.0f; // pixels
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for (size_t t = 0; t < triangles; t++) {
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if (visible[t] || !facing[t]) continue;
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const auto& a = screen[opaque.indices[t * 3]];
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const auto& b = screen[opaque.indices[t * 3 + 1]];
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const auto& c = screen[opaque.indices[t * 3 + 2]];
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if (std::abs(Edge(a, b, c.x, c.y)) * 0.5f > smallArea) continue;
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const auto centre = (a + b + c) / 3.0f;
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const int x = static_cast<int>(centre.x), y = static_cast<int>(centre.y);
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if (x < 0 || y < 0 || x >= resolution || y >= resolution || centre.z <= depth[static_cast<size_t>(y) * resolution + x] + bias) visible[t] = true;
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}
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}
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for (size_t t = 0; t < triangles; t++) result.trianglesRemoved += visible[t] ? 0 : 1;
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result.kept = visible;
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UgcModel::KeepTriangles(opaque, visible);
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return result;
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}
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std::vector<float> AmbientOcclusion(const UgcModel::Mesh& mesh, const UgcModel::Mesh& occluders, float distance, int samples) {
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std::vector<float> ao(mesh.positions.size(), 1.0f);
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if (occluders.Empty() || samples <= 0 || distance <= 0.0f || mesh.normals.size() != mesh.positions.size()) return ao;
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const Bvh bvh(occluders);
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const auto count = static_cast<uint32_t>(samples);
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// Vertices at the same place facing the same way (bricks' shared corners) are worked out once
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struct Key {
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int32_t p[3], n[3];
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bool operator==(const Key& o) const { return std::equal(p, p + 3, o.p) && std::equal(n, n + 3, o.n); }
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};
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struct KeyHash {
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size_t operator()(const Key& k) const {
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size_t h = 1469598103934665603ull;
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for (int i = 0; i < 3; i++) h = (h ^ static_cast<uint32_t>(k.p[i])) * 1099511628211ull ^ static_cast<uint32_t>(k.n[i]) * 0x9E3779B97F4A7C15ull;
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return h;
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}
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};
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std::unordered_map<Key, float, KeyHash> known;
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known.reserve(mesh.positions.size());
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for (size_t v = 0; v < mesh.positions.size(); v++) {
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if ((v & 0xFF) == 0) UgcThrottle::Checkpoint();
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const auto& normal = mesh.normals[v];
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const Key key{ { static_cast<int32_t>(std::lround(mesh.positions[v].x * 1000.0f)), static_cast<int32_t>(std::lround(mesh.positions[v].y * 1000.0f)),
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static_cast<int32_t>(std::lround(mesh.positions[v].z * 1000.0f)) }, { static_cast<int32_t>(std::lround(normal.x * 100.0f)),
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static_cast<int32_t>(std::lround(normal.y * 100.0f)), static_cast<int32_t>(std::lround(normal.z * 100.0f)) } };
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if (const auto it = known.find(key); it != known.end()) {
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ao[v] = it->second;
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|
continue;
|
|
}
|
|
if (glm::dot(normal, normal) < 0.5f) continue;
|
|
// A frame around the normal
|
|
const glm::vec3 helper = std::abs(normal.x) < 0.9f ? glm::vec3(1, 0, 0) : glm::vec3(0, 1, 0);
|
|
const auto tangent = glm::normalize(glm::cross(helper, normal));
|
|
const auto bitangent = glm::cross(normal, tangent);
|
|
// Hammersley points, turned by an amount of the vertex's own (fixed) so neighbours don't band
|
|
const float turn = static_cast<float>((v * 0x9E3779B9u) >> 8 & 0xFFFFFF) / 16777216.0f;
|
|
const auto origin = mesh.positions[v] + normal * 1e-3f;
|
|
uint32_t open = 0;
|
|
for (uint32_t i = 0; i < count; i++) {
|
|
const float u = (i + 0.5f) / static_cast<float>(count);
|
|
const float phi = 2.0f * 3.14159265f * std::fmod(RadicalInverse(i) + turn, 1.0f);
|
|
const float r = std::sqrt(u), z = std::sqrt(std::max(0.0f, 1.0f - u));
|
|
const auto direction = tangent * (r * std::cos(phi)) + bitangent * (r * std::sin(phi)) + normal * z;
|
|
if (!bvh.Hits(origin, direction, distance)) open++;
|
|
}
|
|
ao[v] = static_cast<float>(open) / static_cast<float>(count);
|
|
known.emplace(key, ao[v]);
|
|
}
|
|
return ao;
|
|
}
|
|
|
|
std::vector<float> BakeAo(UgcModel::Model& model, const AoOptions& options) {
|
|
auto& opaque = model.opaque;
|
|
if (!options.enabled || opaque.Empty()) return {};
|
|
auto ao = AmbientOcclusion(opaque, opaque, options.distance, options.samples);
|
|
const float strength = std::clamp(options.strength, 0.0f, 1.0f);
|
|
for (size_t v = 0; v < opaque.colors.size() && v < ao.size(); v++) {
|
|
glm::vec3 lit(1.0f - strength * (1.0f - ao[v]));
|
|
if (v < opaque.glow.size()) lit += opaque.glow[v] * options.glowStrength;
|
|
lit = glm::clamp(lit, 0.0f, 1.0f);
|
|
auto& color = opaque.colors[v];
|
|
color.r = ToSrgb(ToLinear(color.r) * lit.r);
|
|
color.g = ToSrgb(ToLinear(color.g) * lit.g);
|
|
color.b = ToSrgb(ToLinear(color.b) * lit.b);
|
|
}
|
|
return ao;
|
|
}
|
|
|
|
Image RenderIcon(const UgcModel::Model& source, const IconOptions& options, const std::vector<float>* opaqueAo) {
|
|
const int size = std::clamp(options.size, 8, 1024);
|
|
const int supersample = std::clamp(options.supersample, 1, 8);
|
|
const int n = size * supersample;
|
|
Image image{ size, size, std::vector<uint8_t>(static_cast<size_t>(size) * size * 4, 0) };
|
|
if (source.Empty()) return image;
|
|
|
|
UgcModel::Model model = source;
|
|
const auto rotation = UgcIconPose::ModelRotation(options.modelYawDegrees, options.modelPitchDegrees, options.modelRollDegrees) * options.modelRotation;
|
|
model.opaque.Transform(rotation);
|
|
model.transparent.Transform(rotation);
|
|
|
|
// The camera and the crop to the model's projected bounds (shared with the dashboard's pose editor)
|
|
const auto frame = UgcIconPose::Compute({ &model.opaque.positions, &model.transparent.positions },
|
|
{ options.yawDegrees, options.pitchDegrees, options.fovDegrees, options.margin, options.offsetX, options.offsetY });
|
|
if (!frame.ok) return image;
|
|
const glm::vec3 center = frame.center;
|
|
const float radius = frame.radius;
|
|
const glm::vec3 eye = frame.eye;
|
|
const glm::vec3 dir = glm::normalize(eye - center);
|
|
const auto project = [&](const glm::vec3& position) {
|
|
const auto point = frame.IconPoint(position);
|
|
return glm::vec3(point.x * n, point.y * n, point.z);
|
|
};
|
|
|
|
// Linear, premultiplied
|
|
std::vector<glm::vec4> color(static_cast<size_t>(n) * n, glm::vec4(0.0f));
|
|
std::vector<float> depth(static_cast<size_t>(n) * n, INF);
|
|
const float sunYaw = glm::radians(options.sunYawDegrees), sunPitch = glm::radians(options.sunPitchDegrees);
|
|
const glm::vec3 light = glm::normalize(glm::vec3(std::sin(sunYaw) * std::cos(sunPitch), std::sin(sunPitch), std::cos(sunYaw) * std::cos(sunPitch)));
|
|
|
|
// Ambient occlusion darkens the world light (opaque bricks only, as they are what occludes)
|
|
std::vector<float> ao;
|
|
if (options.ao.enabled) {
|
|
ao = opaqueAo && opaqueAo->size() == model.opaque.positions.size() ? *opaqueAo : AmbientOcclusion(model.opaque, model.opaque, options.ao.distance, options.ao.samples);
|
|
}
|
|
|
|
// The sun's shadows: a depth map seen from the sun, looked up with a few taps for the sun's soft edge
|
|
const int shadowSize = 1024;
|
|
const OrthoView sunView(center, radius * 1.05f, light, shadowSize);
|
|
std::vector<float> shadowDepth;
|
|
if (options.shadows > 0.0f) {
|
|
shadowDepth.assign(static_cast<size_t>(shadowSize) * shadowSize, INF);
|
|
const auto& mesh = model.opaque;
|
|
std::vector<glm::vec3> screen(mesh.positions.size());
|
|
for (size_t v = 0; v < mesh.positions.size(); v++) screen[v] = sunView.Project(mesh.positions[v]);
|
|
for (size_t i = 0; i + 2 < mesh.indices.size(); i += 3) {
|
|
if ((i & 0xFFFF) == 0) UgcThrottle::Checkpoint();
|
|
Rasterize(shadowSize, shadowSize, screen[mesh.indices[i]], screen[mesh.indices[i + 1]], screen[mesh.indices[i + 2]], [&](int x, int y, float z, float, float, float) {
|
|
auto& stored = shadowDepth[static_cast<size_t>(y) * shadowSize + x];
|
|
stored = std::min(stored, z);
|
|
});
|
|
}
|
|
}
|
|
const float shadowBias = sunView.PixelSize() * 2.0f;
|
|
const auto sunlit = [&](const glm::vec3& position) {
|
|
if (shadowDepth.empty()) return 1.0f;
|
|
const auto p = sunView.Project(position);
|
|
float lit = 0.0f;
|
|
for (int dy = -1; dy <= 1; dy++) {
|
|
for (int dx = -1; dx <= 1; dx++) {
|
|
const int x = static_cast<int>(p.x) + dx, y = static_cast<int>(p.y) + dy;
|
|
if (x < 0 || y < 0 || x >= shadowSize || y >= shadowSize || p.z <= shadowDepth[static_cast<size_t>(y) * shadowSize + x] + shadowBias) lit += 1.0f;
|
|
}
|
|
}
|
|
const float shadowed = 1.0f - lit / 9.0f;
|
|
return 1.0f - std::clamp(options.shadows, 0.0f, 1.0f) * shadowed;
|
|
};
|
|
const glm::vec3 toCamera = glm::normalize(dir);
|
|
const glm::vec3 halfway = glm::normalize(light + toCamera);
|
|
|
|
const auto shade = [&](const UgcModel::Mesh& mesh, bool isOpaque, uint32_t i0, uint32_t i1, uint32_t i2, float w0, float w1, float w2) {
|
|
glm::vec3 normal(0.0f, 1.0f, 0.0f);
|
|
if (mesh.normals.size() == mesh.positions.size()) {
|
|
normal = mesh.normals[i0] * w0 + mesh.normals[i1] * w1 + mesh.normals[i2] * w2;
|
|
const auto length = glm::length(normal);
|
|
normal = length > 0.0f ? normal / length : glm::vec3(0.0f, 1.0f, 0.0f);
|
|
if (glm::dot(normal, dir) < 0.0f) normal = -normal; // the back of a face
|
|
}
|
|
glm::vec4 base(0.63f, 0.63f, 0.63f, 1.0f);
|
|
if (mesh.colors.size() == mesh.positions.size()) base = mesh.colors[i0] * w0 + mesh.colors[i1] * w1 + mesh.colors[i2] * w2;
|
|
const float occlusion = isOpaque && ao.size() == mesh.positions.size() ? ao[i0] * w0 + ao[i1] * w1 + ao[i2] * w2 : 1.0f;
|
|
const float strength = std::clamp(options.ao.strength, 0.0f, 1.0f);
|
|
const auto position = mesh.positions[i0] * w0 + mesh.positions[i1] * w1 + mesh.positions[i2] * w2;
|
|
const float direct = std::max(0.0f, glm::dot(normal, light));
|
|
const float sun = direct > 0.0f ? sunlit(position + normal * shadowBias) : 0.0f;
|
|
// Diffuse: the world's light (radiance `ambient`), a fill from the camera and the sun's (irradiances, over pi)
|
|
const float lighting = options.ambient * (1.0f - strength * (1.0f - occlusion)) +
|
|
(options.fill * std::max(0.0f, glm::dot(normal, toCamera)) + options.sunStrength * direct * sun) / 3.14159265f;
|
|
// The sun's highlight (Blinn-Phong), white, on top of the color
|
|
const float highlight = direct > 0.0f ? options.specular * options.sunStrength / 3.14159265f * sun * std::pow(std::max(0.0f, glm::dot(normal, halfway)), std::max(options.shininess, 1.0f)) : 0.0f;
|
|
const float exposure = std::max(options.exposure, 0.0f);
|
|
const auto look = isOpaque && mesh.looks.size() == mesh.positions.size() ? mesh.looks[i0] : UgcModel::eLook::PLASTIC;
|
|
if (look == UgcModel::eLook::PLASTIC) {
|
|
return glm::vec4((ToLinear(base.r) * lighting + highlight) * exposure, (ToLinear(base.g) * lighting + highlight) * exposure,
|
|
(ToLinear(base.b) * lighting + highlight) * exposure, std::clamp(base.a, 0.0f, 1.0f));
|
|
}
|
|
const glm::vec3 linear(ToLinear(base.r), ToLinear(base.g), ToLinear(base.b));
|
|
glm::vec3 shaded = (linear * lighting + glm::vec3(highlight)) * exposure;
|
|
if (look == UgcModel::eLook::METAL || look == UgcModel::eLook::BRUSHED) {
|
|
// A reflection of a bright sky over a dark ground, tinted by the color (polished: sharp; brushed: blurred
|
|
// and duller), over a dimmed diffuse light, and the sun's highlight in the metal's color
|
|
const bool polished = look == UgcModel::eLook::METAL;
|
|
const auto reflected = glm::reflect(-toCamera, normal);
|
|
const float up = polished ? glm::smoothstep(-0.15f, 0.5f, reflected.y) : 0.5f + 0.5f * reflected.y;
|
|
const float environment = glm::mix(0.06f, polished ? 1.1f : 0.75f, up);
|
|
const float spot = direct > 0.0f ? options.sunStrength / 3.14159265f * sun *
|
|
std::pow(std::max(0.0f, glm::dot(normal, halfway)), polished ? 180.0f : 30.0f) * (polished ? 4.0f : 1.2f) : 0.0f;
|
|
shaded = linear * (lighting * 0.35f + environment + spot) * exposure;
|
|
} else if (look == UgcModel::eLook::GLOW) {
|
|
// LEGO-Emissive: lerp(lit, vertex color, vertex alpha * the material's emissive red)
|
|
shaded = glm::mix(shaded, linear, std::clamp(options.glowEmissive, 0.0f, 1.0f));
|
|
}
|
|
return glm::vec4(shaded, std::clamp(base.a, 0.0f, 1.0f));
|
|
};
|
|
|
|
// Opaque first, with the depth buffer
|
|
{
|
|
const auto& mesh = model.opaque;
|
|
std::vector<glm::vec3> screen(mesh.positions.size());
|
|
for (size_t v = 0; v < mesh.positions.size(); v++) screen[v] = project(mesh.positions[v]);
|
|
for (size_t i = 0; i + 2 < mesh.indices.size(); i += 3) {
|
|
const auto i0 = mesh.indices[i], i1 = mesh.indices[i + 1], i2 = mesh.indices[i + 2];
|
|
Rasterize(n, n, screen[i0], screen[i1], screen[i2], [&](int x, int y, float z, float w0, float w1, float w2) {
|
|
const size_t index = static_cast<size_t>(y) * n + x;
|
|
if (z >= depth[index]) return;
|
|
depth[index] = z;
|
|
const auto shaded = shade(mesh, true, i0, i1, i2, w0, w1, w2);
|
|
color[index] = glm::vec4(glm::vec3(shaded), 1.0f);
|
|
});
|
|
}
|
|
}
|
|
|
|
// Then transparent triangles, farthest first, blended over it
|
|
{
|
|
const auto& mesh = model.transparent;
|
|
std::vector<glm::vec3> screen(mesh.positions.size());
|
|
for (size_t v = 0; v < mesh.positions.size(); v++) screen[v] = project(mesh.positions[v]);
|
|
std::vector<size_t> order(mesh.indices.size() / 3);
|
|
std::iota(order.begin(), order.end(), 0);
|
|
const auto depthOf = [&](size_t t) { return screen[mesh.indices[t * 3]].z + screen[mesh.indices[t * 3 + 1]].z + screen[mesh.indices[t * 3 + 2]].z; };
|
|
std::sort(order.begin(), order.end(), [&](size_t a, size_t b) { return depthOf(a) > depthOf(b); });
|
|
for (const auto t : order) {
|
|
const auto i0 = mesh.indices[t * 3], i1 = mesh.indices[t * 3 + 1], i2 = mesh.indices[t * 3 + 2];
|
|
Rasterize(n, n, screen[i0], screen[i1], screen[i2], [&](int x, int y, float z, float w0, float w1, float w2) {
|
|
const size_t index = static_cast<size_t>(y) * n + x;
|
|
if (z >= depth[index]) return;
|
|
const auto shaded = shade(mesh, false, i0, i1, i2, w0, w1, w2);
|
|
const float alpha = shaded.a;
|
|
auto& target = color[index];
|
|
target = glm::vec4(glm::vec3(shaded) * alpha + glm::vec3(target) * (1.0f - alpha), alpha + target.a * (1.0f - alpha));
|
|
});
|
|
}
|
|
}
|
|
|
|
// Box filter down to the icon's size
|
|
const float samples = static_cast<float>(supersample * supersample);
|
|
for (int y = 0; y < size; y++) {
|
|
for (int x = 0; x < size; x++) {
|
|
glm::vec4 sum(0.0f);
|
|
for (int sy = 0; sy < supersample; sy++) {
|
|
for (int sx = 0; sx < supersample; sx++) sum += color[static_cast<size_t>(y * supersample + sy) * n + (x * supersample + sx)];
|
|
}
|
|
sum /= samples;
|
|
uint8_t* out = &image.rgba[(static_cast<size_t>(y) * size + x) * 4];
|
|
if (sum.a <= 0.0f) continue;
|
|
// sRGB, then the contrast around its middle grey
|
|
const auto tone = [&options](float linear) { return std::clamp(0.5f + (ToSrgb(linear) - 0.5f) * options.contrast, 0.0f, 1.0f); };
|
|
out[0] = static_cast<uint8_t>(std::lround(tone(sum.r / sum.a) * 255.0f));
|
|
out[1] = static_cast<uint8_t>(std::lround(tone(sum.g / sum.a) * 255.0f));
|
|
out[2] = static_cast<uint8_t>(std::lround(tone(sum.b / sum.a) * 255.0f));
|
|
out[3] = static_cast<uint8_t>(std::lround(std::clamp(sum.a, 0.0f, 1.0f) * 255.0f));
|
|
}
|
|
}
|
|
return image;
|
|
}
|
|
}
|