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#include "render_path.h"
#include "scene/scene.h"
#include "core/log.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"
#include <glm/gtc/matrix_transform.hpp>
#include <algorithm>
#include <cmath>
#include <filesystem>
#include <ctime>
#include <cstdio>
#include <vector>
namespace Donut
{
auto RenderPath::init(RHI::Device& device, const std::string& hdri_path) -> bool
{
m_device = &device;
m_hdri_path = hdri_path;
m_cubemap = device.create_cubemap_from_hdri(hdri_path);
m_scene_renderer = create_scope<SceneRenderer>();
m_scene_renderer->init(device);
m_black_hole_renderer = create_scope<BlackHoleRenderer>();
m_black_hole_renderer->init(device);
return true;
}
auto RenderPath::sync_hdri(const std::string& hdri_path) -> void
{
if (hdri_path == m_hdri_path || !m_device) return;
m_device->wait_idle();
m_cubemap = m_device->create_cubemap_from_hdri(hdri_path); // old cube freed after idle
m_hdri_path = hdri_path;
}
auto RenderPath::render(RHI::CommandList& cmd, Scene& scene, View view,
int fb_width, int fb_height, bool moving, float time) -> void
{
const glm::vec4 clear(0.05f, 0.06f, 0.10f, 1.0f);
// the black hole is the only view with an off-screen pass; it renders (and
// runs the expensive geodesic) ONLY when the view is Simulation. scene and
// none are a single swapchain pass — none draws nothing (empty viewport).
if (view != View::BlackHole)
{
cmd.begin_render_pass(nullptr, clear);
if (view == View::Scene)
{
// projection was set by the Application this frame (shared with the gizmo).
CameraView cv;
cv.view = scene.scene_camera.get_view_matrix();
cv.projection = scene.scene_camera.get_projection_matrix();
cv.position = scene.scene_camera.get_orbital_position();
cv.fb_width = fb_width; cv.fb_height = fb_height;
m_scene_renderer->render(cmd, cv, scene.objects, scene.selected_object, m_cubemap.get());
}
m_device->imgui_render(cmd);
cmd.end_render_pass();
}
else
{
GeodesicView gv;
glm::vec3 pos, fwd;
if (scene.sim_camera.get_camera_mode() == CameraMode::FPS)
{
pos = scene.sim_camera.get_position();
fwd = scene.sim_camera.get_forward_direction();
}
else
{
pos = scene.sim_camera.get_orbital_position();
fwd = glm::normalize(scene.sim_camera.get_orbital_target() - pos);
}
glm::vec3 right = glm::normalize(glm::cross(fwd, glm::vec3(0, 1, 0)));
gv.position = pos; gv.right = right; gv.up = glm::cross(right, fwd); gv.forward = fwd;
gv.tan_half_fov = (float)tan(glm::radians(scene.black_hole.fov_degrees * 0.5f));
gv.aspect = (float)BlackHoleRenderer::GEO_HI_W / (float)BlackHoleRenderer::GEO_HI_H;
gv.moving = moving;
gv.time = time;
m_black_hole_renderer->render_geodesic(cmd, gv, scene.black_hole, scene.objects, m_cubemap.get());
cmd.begin_render_pass(nullptr, clear);
m_black_hole_renderer->blit(cmd, fb_width, fb_height);
m_device->imgui_render(cmd);
cmd.end_render_pass();
}
}
auto RenderPath::shutdown() -> void
{
m_scene_renderer.reset();
m_black_hole_renderer.reset();
m_cubemap.reset();
// backend-specific HDRI/GPU resource cleanup is the device's job (see e.g.
// the OpenGL device clearing the HDRIManager texture cache on shutdown).
}
// Portable Float Map: a raw RGB float image (the actual physical values). its
// raster is bottom-up; -1.0 scale flags little-endian.
static auto write_pfm(const std::string& path, int w, int h, const std::vector<float>& rgba) -> bool
{
std::FILE* f = std::fopen(path.c_str(), "wb");
if (!f) return false;
std::fprintf(f, "PF\n%d %d\n-1.0\n", w, h);
std::vector<float> rgb((size_t)w * 3);
for (int y = h - 1; y >= 0; --y)
{
const float* src = &rgba[(size_t)y * w * 4];
for (int x = 0; x < w; ++x) { rgb[x*3+0] = src[x*4+0]; rgb[x*3+1] = src[x*4+1]; rgb[x*3+2] = src[x*4+2]; }
std::fwrite(rgb.data(), sizeof(float), (size_t)w * 3, f);
}
std::fclose(f);
return true;
}
// CSV grid of the scalar value (the R channel), one image row per text line.
static auto write_csv(const std::string& path, int w, int h, const std::vector<float>& rgba) -> bool
{
std::FILE* f = std::fopen(path.c_str(), "wb");
if (!f) return false;
for (int y = 0; y < h; ++y)
{
for (int x = 0; x < w; ++x) std::fprintf(f, x ? ",%g" : "%g", rgba[((size_t)y * w + x) * 4]);
std::fputc('\n', f);
}
std::fclose(f);
return true;
}
auto RenderPath::export_frame(Scene& scene, const ExportConfig& cfg) -> int
{
if (!m_device) return 0;
const int w = std::max(cfg.width, 1), h = std::max(cfg.height, 1);
const bool raw = cfg.format != ExportFormat::Png; // pfm / csv want physical values
auto target = m_device->create_render_target(
w, h, raw ? RHI::Format::RGBA32F : RHI::Format::RGBA8, RHI::Format::None, RHI::Filter::Nearest);
// full-quality geodesic view from the sim camera (moving = false = settled).
GeodesicView gv;
glm::vec3 pos, fwd;
if (scene.sim_camera.get_camera_mode() == CameraMode::FPS)
{ pos = scene.sim_camera.get_position(); fwd = scene.sim_camera.get_forward_direction(); }
else
{ pos = scene.sim_camera.get_orbital_position(); fwd = glm::normalize(scene.sim_camera.get_orbital_target() - pos); }
glm::vec3 right = glm::normalize(glm::cross(fwd, glm::vec3(0, 1, 0)));
gv.position = pos; gv.right = right; gv.up = glm::cross(right, fwd); gv.forward = fwd;
gv.tan_half_fov = (float)tan(glm::radians(scene.black_hole.fov_degrees * 0.5f));
gv.aspect = (float)w / (float)h;
gv.moving = false;
gv.time = 0.0f;
std::error_code ec; std::filesystem::create_directories(cfg.directory, ec); // lowk dc, the write below complains if it mattered
char stamp[32]; std::time_t t = std::time(nullptr);
std::strftime(stamp, sizeof(stamp), "%Y%m%d_%H%M%S", std::localtime(&t));
const char* ext = cfg.format == ExportFormat::Pfm ? "pfm" : cfg.format == ExportFormat::Csv ? "csv" : "png";
int written = 0;
std::vector<uint8_t> px8; std::vector<float> pxf;
auto do_channel = [&](bool enabled, int channel, const char* name)
{
if (!enabled) return;
m_device->run_offscreen([&](RHI::CommandList& cmd) {
m_black_hole_renderer->render_export(cmd, target.get(), gv, scene.black_hole,
scene.objects, m_cubemap.get(), channel, raw);
});
std::string path = cfg.directory + "/donut_" + name + "_" + stamp + "." + ext;
bool ok;
if (cfg.format == ExportFormat::Png)
{ m_device->read_render_target(target.get(), px8); ok = stbi_write_png(path.c_str(), w, h, 4, px8.data(), w * 4) != 0; }
else
{
m_device->read_render_target_float(target.get(), pxf);
ok = (cfg.format == ExportFormat::Pfm) ? write_pfm(path, w, h, pxf) : write_csv(path, w, h, pxf);
}
if (ok) { DONUT_INFO("Exported {}", path); ++written; } else DONUT_ERROR("Export failed: {}", path);
};
do_channel(cfg.color, 0, "color");
do_channel(cfg.redshift, 1, "redshift");
do_channel(cfg.temperature, 2, "temperature");
do_channel(cfg.impact, 3, "impact");
return written;
}
}
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