80 lines
2.7 KiB
C++
80 lines
2.7 KiB
C++
#pragma once
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#include <array>
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#include <cstdint>
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#include <memory>
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#include <mutex>
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#include <string>
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#include <vector>
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namespace boundard {
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// 渲染组件：描述 Actor 的几何形状、颜色和可选 PNG 纹理。
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class Mesh {
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public:
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struct Vertex {
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std::array<float, 2> position;
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std::array<float, 4> color;
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std::array<float, 2> uv;
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};
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std::vector<Vertex> vertices;
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std::vector<uint32_t> indices;
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std::string texture; // PNG 纹理路径；为空时使用白色纹理。
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std::array<float, 4> color() const {
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std::lock_guard<std::mutex> lock(*color_mutex_);
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return color_;
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}
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void set_color(std::array<float, 4> color) {
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std::lock_guard<std::mutex> lock(*color_mutex_);
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color_ = color;
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}
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static Mesh quad() {
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Mesh mesh;
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mesh.vertices = {
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{{-1.0F, -1.0F}, {1.0F, 1.0F, 1.0F, 1.0F}, {0.0F, 0.0F}},
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{{1.0F, -1.0F}, {1.0F, 1.0F, 1.0F, 1.0F}, {1.0F, 0.0F}},
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{{1.0F, 1.0F}, {1.0F, 1.0F, 1.0F, 1.0F}, {1.0F, 1.0F}},
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{{-1.0F, 1.0F}, {1.0F, 1.0F, 1.0F, 1.0F}, {0.0F, 1.0F}},
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};
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mesh.indices = {0, 1, 2, 2, 3, 0};
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return mesh;
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}
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static Mesh grid(int half_cells = 12) {
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Mesh mesh;
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const float world_to_local = 1.0F / 0.35F;
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const float half_extent = static_cast<float>(half_cells) * world_to_local;
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const float line_half_width = 0.012F * world_to_local;
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const std::array<float, 4> line_color{1.0F, 1.0F, 1.0F, 1.0F};
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auto add_rect = [&](float left, float bottom, float right, float top) {
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const uint32_t base = static_cast<uint32_t>(mesh.vertices.size());
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mesh.vertices.insert(mesh.vertices.end(), {
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{{left, bottom}, line_color, {0.0F, 0.0F}},
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{{right, bottom}, line_color, {1.0F, 0.0F}},
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{{right, top}, line_color, {1.0F, 1.0F}},
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{{left, top}, line_color, {0.0F, 1.0F}},
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});
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mesh.indices.insert(mesh.indices.end(),
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{base, base + 1, base + 2, base + 2, base + 3, base});
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};
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for (int cell = -half_cells; cell <= half_cells; ++cell) {
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const float coordinate = static_cast<float>(cell) * world_to_local;
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add_rect(coordinate - line_half_width, -half_extent, coordinate + line_half_width,
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half_extent);
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add_rect(-half_extent, coordinate - line_half_width, half_extent,
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coordinate + line_half_width);
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}
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return mesh;
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}
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private:
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std::unique_ptr<std::mutex> color_mutex_ = std::make_unique<std::mutex>();
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std::array<float, 4> color_{1.0F, 1.0F, 1.0F, 1.0F};
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};
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} // namespace boundard
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