local have bitset rendering

src/bitset_image_loader.cpp

@@ -0,0 +1,85 @@
+#include "./bitset_image_loader.hpp"
+
+#include <solanaceae/object_store/object_store.hpp>
+#include <solanaceae/object_store/meta_components_file.hpp>
+
+#include "./os_comps.hpp"
+
+#include <entt/entity/entity.hpp>
+
+#include <SDL3/SDL.h>
+
+#include <iostream>
+
+// fwd
+namespace Message {
+uint64_t getTimeMS(void);
+}
+
+BitsetImageLoader::BitsetImageLoader(void) {
+}
+
+std::optional<TextureEntry> BitsetImageLoader::load(TextureUploaderI& tu, ObjectHandle o) {
+	if (!static_cast<bool>(o)) {
+		std::cerr << "BIL error: trying to load invalid object\n";
+		return std::nullopt;
+	}
+
+	if (!o.all_of<ObjComp::F::LocalHaveBitset>()) {
+		// after completion, this is called until the texture times out
+		//std::cout << "BIL: no local have bitset\n";
+		return std::nullopt;
+	}
+
+	// TODO: const
+	auto& have = o.get<ObjComp::F::LocalHaveBitset>().have;
+
+	auto* surf = SDL_CreateSurfaceFrom(
+		have.size_bits(), 1,
+		SDL_PIXELFORMAT_INDEX1MSB, // LSB ?
+		have.data(), have.size_bytes()
+	);
+	if (surf == nullptr) {
+		std::cerr << "BIL error: bitset to 1bit surface creationg failed o:" << entt::to_integral(o.entity()) << "\n";
+		return std::nullopt;
+	}
+
+	SDL_Color colors[] {
+		{0, 0, 0, 0},
+		{255, 255, 255, 255},
+	};
+
+	SDL_Palette* palette = SDL_CreatePalette(2);
+	SDL_SetPaletteColors(palette, colors, 0, 2);
+	SDL_SetSurfacePalette(surf, palette);
+	auto* conv_surf = SDL_ConvertSurface(surf, SDL_PIXELFORMAT_RGBA32);
+
+	SDL_DestroySurface(surf);
+	SDL_DestroyPalette(palette);
+
+	if (conv_surf == nullptr) {
+		std::cerr << "BIL error: surface conversion failed o:" << entt::to_integral(o.entity()) << " : " << SDL_GetError() << "\n";
+		return std::nullopt;
+	}
+
+	SDL_LockSurface(conv_surf);
+
+	TextureEntry new_entry;
+	new_entry.timestamp_last_rendered = Message::getTimeMS();
+	new_entry.current_texture = 0;
+	new_entry.width = have.size_bits();
+	new_entry.height = 1;
+
+	const auto n_t = tu.upload(static_cast<uint8_t*>(conv_surf->pixels), conv_surf->w, conv_surf->h, TextureUploaderI::RGBA);
+	assert(n_t != 0);
+	new_entry.textures.push_back(n_t);
+	new_entry.frame_duration.push_back(0);
+
+	std::cout << "BIL: genereated bitset image o:" << entt::to_integral(o.entity()) << "\n";
+
+	SDL_UnlockSurface(conv_surf);
+	SDL_DestroySurface(conv_surf);
+
+	return new_entry;
+}
+