Load OpenGL textures using GDI+

tex_man.cpp

namespace Gdiplus {
	using std::min;
	using std::max;
}
#include <gdiplus.h>
#pragma comment(lib, "gdiplus.lib")

static GLuint LoadTextureViaOS(const char* name)
{
	Gdiplus::GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR gdiplusToken;
	Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, nullptr);
	WCHAR wc[MAX_PATH];
	MultiByteToWideChar(CP_ACP, 0, name, -1, wc, dimof(wc));
	Gdiplus::Bitmap* image = new Gdiplus::Bitmap(wc);

	int w = (int)image->GetWidth();
	int h = (int)image->GetHeight();
	Gdiplus::Rect rc(0, 0, w, h);

	Gdiplus::BitmapData* bitmapData = new Gdiplus::BitmapData;
	image->LockBits(&rc, Gdiplus::ImageLockModeRead, PixelFormat32bppARGB, bitmapData);

	std::vector<uint32_t> col;
	col.resize(w * h);
	for (int y = 0; y < h; y++) {
		memcpy(&col[y * w], (char*)bitmapData->Scan0 + bitmapData->Stride * y, w * 4);
		for (int x = 0; x < w; x++) {
			uint32_t& c = col[y * w + x];
			c = (c & 0xff00ff00) | ((c & 0xff) << 16) | ((c & 0xff0000) >> 16);
		}
	}
	image->UnlockBits(bitmapData);
	delete bitmapData;
	delete image;
	Gdiplus::GdiplusShutdown(gdiplusToken);

	GLuint texture;
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, &col[0]);
	glGenerateMipmap(GL_TEXTURE_2D);
	glBindTexture(GL_TEXTURE_2D, 0);
	return texture;
}

I have a complete working example here https://bobobobo.wordpress.com/2021/09/17/gdi-to-opengl/