BT411/engine/MUNGA_L4/L4PLASMAWIN.cpp

#include "mungal4.h"
#pragma hdrstop

//###########################################################################
// L4PLASMAWIN -- the desktop plasma display (BT_GLASS only; this TU is only
// in the build when the gate is on -- see CMakeLists.txt).
// Design: L4PLASMAWIN.h.
//###########################################################################

#include "l4plasmawin.h"

#include <windows.h>
#include <stdlib.h>
#include <string.h>

static LRESULT CALLBACK
	PlasmaWndProc(HWND window, UINT message, WPARAM wparam, LPARAM lparam)
{
	switch (message)
	{
	case WM_CLOSE:
		ShowWindow(window, SW_HIDE);	// hide only; the renderer owns it
		return 0;
	}
	return DefWindowProcW(window, message, wparam, lparam);
}

//###########################################################################

PlasmaWindow::PlasmaWindow():
	Video8BitBuffered(plasmaWidth, plasmaHeight),
	window(NULL),
	blitBuffer(NULL)
{
	scale = 4;
	const char *scale_string = getenv("L4PLASMASCALE");
	if (scale_string != NULL)
	{
		int v = atoi(scale_string);
		if (v >= 1 && v <= 16)
		{
			scale = v;
		}
	}
	blitBuffer = new unsigned long[plasmaWidth * plasmaHeight];
	memset(blitBuffer, 0, plasmaWidth * plasmaHeight * sizeof(unsigned long));
	DEBUG_STREAM << "[plasmawin] desktop plasma display up (scale x"
		<< scale << ")\n" << std::flush;
}

PlasmaWindow::~PlasmaWindow()
{
	if (window != NULL)
	{
		DestroyWindow((HWND)window);
		window = NULL;
	}
	delete[] blitBuffer;
	blitBuffer = NULL;
}

void
	PlasmaWindow::EnsureWindow()
{
	if (window != NULL)
	{
		return;
	}

	WNDCLASSW window_class;
	memset(&window_class, 0, sizeof(window_class));
	window_class.lpfnWndProc   = PlasmaWndProc;
	window_class.hInstance     = GetModuleHandleW(NULL);
	window_class.hCursor       = LoadCursorW(NULL, (LPCWSTR)IDC_ARROW);
	window_class.lpszClassName = L"BTPlasmaWnd";
	RegisterClassW(&window_class);

	RECT frame = { 0, 0, plasmaWidth * scale, plasmaHeight * scale };
	DWORD style = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX;
	AdjustWindowRect(&frame, style, FALSE);

	//
	// Bottom-right, TOPMOST -- under the (topmost, right-parked) button
	// panel, clear of the game window (which would otherwise bury it).
	//
	int frame_width  = frame.right - frame.left;
	int frame_height = frame.bottom - frame.top;
	int plasma_x = GetSystemMetrics(SM_CXSCREEN) - frame_width - 12;
	int plasma_y = GetSystemMetrics(SM_CYSCREEN) - frame_height - 60;
	if (plasma_x < 0)  plasma_x = 0;
	if (plasma_y < 0)  plasma_y = 0;

	window = CreateWindowExW(
		WS_EX_TOPMOST,
		L"BTPlasmaWnd", L"BattleTech - Plasma",
		style,
		plasma_x, plasma_y,
		frame_width, frame_height,
		NULL, NULL, GetModuleHandleW(NULL), NULL);
	if (window == NULL)
	{
		DEBUG_STREAM << "[plasmawin] CreateWindow failed\n" << std::flush;
		return;
	}
	ShowWindow((HWND)window, SW_SHOWNOACTIVATE);
}

//
// The per-frame external-display flush (the gauge renderer calls this
// where the serial path streams changed lines out the COM port).  Blits
// the whole 8-bit buffer as orange-on-black.  Returns False = done (no
// multi-call transfer in progress, unlike the serial path).
//
Logical
	PlasmaWindow::Update(Logical force_all)
{
	(void)force_all;
	EnsureWindow();
	if (window == NULL || pixelBuffer == NULL ||
		pixelBuffer->Data.MapPointer == NULL)
	{
		return False;
	}

	//
	// 8-bit index -> BGRA: any lit index renders plasma orange, intensity
	// stepped a little by index so shaded glyphs keep their shape.  The
	// gauge renderer writes the buffer TOP-DOWN (user-verified 2026-07-17:
	// a bottom-up flip rendered the marquee upside down) -- copy straight.
	//
	const Byte *source = pixelBuffer->Data.MapPointer;
	for (int y = 0; y < plasmaHeight; ++y)
	{
		const Byte *line = source + y * plasmaWidth;
		unsigned long *destination = blitBuffer + y * plasmaWidth;
		for (int x = 0; x < plasmaWidth; ++x)
		{
			Byte index = line[x];
			if (index == 0)
			{
				destination[x] = 0x00180800;			// near-black
			}
			else
			{
				unsigned long intensity = 160 + (index % 6) * 19;	// 160..255
				destination[x] =
					(intensity << 16) |					// R
					((intensity * 140 / 255) << 8);		// G (amber)
			}
		}
	}

	BITMAPINFO info;
	memset(&info, 0, sizeof(info));
	info.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
	info.bmiHeader.biWidth       = plasmaWidth;
	info.bmiHeader.biHeight      = -plasmaHeight;		// top-down
	info.bmiHeader.biPlanes      = 1;
	info.bmiHeader.biBitCount    = 32;
	info.bmiHeader.biCompression = BI_RGB;

	HDC dc = GetDC((HWND)window);
	if (dc != NULL)
	{
		RECT client;
		GetClientRect((HWND)window, &client);
		StretchDIBits(dc,
			0, 0, client.right, client.bottom,
			0, 0, plasmaWidth, plasmaHeight,
			blitBuffer, &info, DIB_RGB_COLORS, SRCCOPY);
		ReleaseDC((HWND)window, dc);
	}
	return False;
}

void
	PlasmaWindow::WaitForUpdate()
{
}