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76 行
1.7 KiB
76 行
1.7 KiB
#pragma once
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#include "gp_config.hpp"
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#include "gp/math.hpp"
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#include "gp/function.hpp"
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#include "gp/algorithm/min_of.hpp"
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#include "gp/indexed_array.hpp"
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using vec2 = gp::vec2_g<>;
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using vec3 = gp::vec3_g<>;
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using vec4 = gp::vec4_g<>;
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struct camera{
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vec3 position;
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vec3 normal;
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};
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using index_t = size_t;
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using distance_t = gp_config::rendering::default_type;
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using color_t = GP_CONFIG__RENDERING__COLOR_T;
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struct render_point{
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distance_t distance;
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index_t material;
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bool operator<(const render_point& rhs) {
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return distance < rhs.distance;
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}
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};
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using sdf_t = gp::function<render_point(vec3)>;
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using material_t = gp::function<color_t(vec3)>;
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class renderer {
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using g_t = gp_config::rendering::default_type;
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constexpr static auto epsilon = gp_config::rendering::epsilon;
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public:
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gp::indexed_array<sdf_t, 4096> scene_elements;
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gp::indexed_array<material_t, 4096> materials;
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material_t sky_box = [](vec3) -> color_t { return vec4{0,0,0,0};};
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vec2 _resolution{128,64};
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camera _camera{{0, 0, -1}, {0, 0, 0}};
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vec2 _fov{90, 45};
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distance_t projection_start = 1;
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distance_t projection_end = 50;
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size_t passes = 12;
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renderer() = default;
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color_t render(vec2 pixel) {
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g_t depth = projection_start;
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vec3 target{0,0,0};
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target = target.normalize();
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vec3 render_target{_camera.position};
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for(int i = 0; i < passes; ++i) {
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render_target = _camera.position+depth*target;
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render_point distance = gp::min_of(
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scene_elements.begin(),
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scene_elements.end(),
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[&](auto& p){
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return p(render_target);
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}
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);
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if(distance.distance < epsilon) {
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return materials[distance.material](render_target);
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}
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depth += distance.distance;
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if(depth >= projection_end) {
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break;
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}
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}
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return sky_box(render_target);
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}
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};
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