NS/main/source/cl_dll/hud_crosshairs.cpp

#include "hud.h"
#include "cl_util.h"
#include "parsemsg.h"
#include "hudgl.h"

// Crosshair system based on OpenAG
// https://github.com/YaLTeR/OpenAG

int CHudCrosshairs::Init()
{
	m_iFlags = HUD_ACTIVE;

	cl_cross = CVAR_CREATE("cl_cross", "0", FCVAR_ARCHIVE);
	cl_cross_color = CVAR_CREATE("cl_cross_color", "255 255 255", FCVAR_ARCHIVE);
	cl_cross_alpha = CVAR_CREATE("cl_cross_alpha", "255", FCVAR_ARCHIVE);
	cl_cross_thickness = CVAR_CREATE("cl_cross_thickness", "2", FCVAR_ARCHIVE);
	cl_cross_size = CVAR_CREATE("cl_cross_size", "6", FCVAR_ARCHIVE);
	cl_cross_gap = CVAR_CREATE("cl_cross_gap", "3", FCVAR_ARCHIVE);
	cl_cross_outline = CVAR_CREATE("cl_cross_outline", "2", FCVAR_ARCHIVE);
	cl_cross_outline_alpha = CVAR_CREATE("cl_cross_outline_alpha", "255", FCVAR_ARCHIVE);
	cl_cross_outline_inner = CVAR_CREATE("cl_cross_outline_inner", "0", FCVAR_ARCHIVE);
	cl_cross_circle_radius = CVAR_CREATE("cl_cross_circle_radius", "0", FCVAR_ARCHIVE);
	cl_cross_dot_size = CVAR_CREATE("cl_cross_dot_size", "0", FCVAR_ARCHIVE);
	cl_cross_dot_color = CVAR_CREATE("cl_cross_dot_color", "", FCVAR_ARCHIVE);
	cl_cross_dot_outline = CVAR_CREATE("cl_cross_dot_outline", "0", FCVAR_ARCHIVE);
	cl_cross_line_top = CVAR_CREATE("cl_cross_line_top", "1", FCVAR_ARCHIVE);
	cl_cross_line_bottom = CVAR_CREATE("cl_cross_line_bottom", "1", FCVAR_ARCHIVE);
	cl_cross_line_left = CVAR_CREATE("cl_cross_line_left", "1", FCVAR_ARCHIVE);
	cl_cross_line_right = CVAR_CREATE("cl_cross_line_right", "1", FCVAR_ARCHIVE);

	gHUD.AddHudElem(this);
	return 0;
}

int CHudCrosshairs::VidInit()
{
	return 1;
}

int CHudCrosshairs::Draw(float time)
{
	if (cl_cross->value == 0.0f)
		return 0;

	unsigned char alpha;
	if (sscanf(cl_cross_alpha->string, "%hhu", &alpha) != 1)
		alpha = 255;

	if (alpha == 0)
		return 0;

	if (gHUD.GetInTopDownMode())
		return 0;

	// outline alpha perhaps unnecessary since odd numbered thicknesses feather the outline edges
	unsigned char outalpha;
	if (sscanf(cl_cross_outline_alpha->string, "%hhu", &outalpha) != 1)
		outalpha = 255;
	
	if (outalpha == 0)
		return 0;

	unsigned char r, g, b;
	if (sscanf(cl_cross_color->string, "%hhu %hhu %hhu", &r, &g, &b) != 3) {
		r = 0;
		g = 255;
		b = 0;
	}


	Vector2D center(ScreenWidth() / 2.0f, ScreenHeight() / 2.0f);

	HudGL gl;

	// Draw the outline.
	// TODO: this contains a terrible amount of repeating complex code.
	//
	// Possible solution: can be changed to this with the one downside being in rare cases where cl_cross_thickness is high AND its alpha is <255, the center of each line will be slightly darker.
	// Example below is for bottom line. Would also cause certain crosshairs that have outlines on invisible cross lines to not look right.
	// gl.rectangle(Vector2D(center.x + offset, center.y + gap - half_width), Vector2D(center.x - offset, center.y + gap + size + half_width));
	if (cl_cross_outline->value > 0.0f) {
		//gl.color(0, 0, 0, alpha);
		gl.color(0, 0, 0, outalpha);
		gl.line_width(cl_cross_outline->value);

		auto size = cl_cross_size->value;
		auto gap = cl_cross_gap->value;
		auto half_thickness = cl_cross_thickness->value / 2.0f;
		auto half_width = cl_cross_outline->value / 2.0f;
		auto offset = half_thickness + half_width;

		// Top line
		if (cl_cross_line_top->value) {
			gl.line(Vector2D(center.x - offset, center.y - gap - size), Vector2D(center.x + offset, center.y - gap - size));
			if (cl_cross_outline_inner->value == 0.0f)
			{
				gl.line(Vector2D(center.x + half_thickness, center.y - gap - size + half_width), Vector2D(center.x + half_thickness, center.y - gap));
				gl.line(Vector2D(center.x - half_thickness, center.y - gap), Vector2D(center.x - half_thickness, center.y - gap - size + half_width));
			}
			else
			{
				gl.line(Vector2D(center.x + half_thickness, center.y - gap - size + half_width), Vector2D(center.x + half_thickness, center.y - gap - half_width));
				gl.line(Vector2D(center.x + offset, center.y - gap), Vector2D(center.x - offset, center.y - gap));
				gl.line(Vector2D(center.x - half_thickness, center.y - gap - half_width), Vector2D(center.x - half_thickness, center.y - gap - size + half_width));
			}
		}

		// Bottom line
		if (cl_cross_line_bottom->value) {
			gl.line(Vector2D(center.x - offset, center.y + gap + size), Vector2D(center.x + offset, center.y + gap + size));
			if (cl_cross_outline_inner->value == 0.0f)
			{
				gl.line(Vector2D(center.x + half_thickness, center.y + gap + size - half_width), Vector2D(center.x + half_thickness, center.y + gap));
				gl.line(Vector2D(center.x - half_thickness, center.y + gap), Vector2D(center.x - half_thickness, center.y + gap + size - half_width));
			}
			else
			{
				gl.line(Vector2D(center.x + half_thickness, center.y + gap + size - half_width), Vector2D(center.x + half_thickness, center.y + gap + half_width));
				gl.line(Vector2D(center.x + offset, center.y + gap), Vector2D(center.x - offset, center.y + gap));
				gl.line(Vector2D(center.x - half_thickness, center.y + gap + half_width), Vector2D(center.x - half_thickness, center.y + gap + size - half_width));
			}
		}

		// Left line
		if (cl_cross_line_left->value) {
			gl.line(Vector2D(center.x - gap - size, center.y - offset), Vector2D(center.x - gap - size, center.y + offset));
			if (cl_cross_outline_inner->value == 0.0f)
			{
				gl.line(Vector2D(center.x - gap - size + half_width, center.y + half_thickness), Vector2D(center.x - gap, center.y + half_thickness));
				gl.line(Vector2D(center.x - gap, center.y - half_thickness), Vector2D(center.x - gap - size + half_width, center.y - half_thickness));
			}
			else
			{
				gl.line(Vector2D(center.x - gap - size + half_width, center.y + half_thickness), Vector2D(center.x - gap - half_width, center.y + half_thickness));
				gl.line(Vector2D(center.x - gap, center.y + offset), Vector2D(center.x - gap, center.y - offset));
				gl.line(Vector2D(center.x - gap - half_width, center.y - half_thickness), Vector2D(center.x - gap - size + half_width, center.y - half_thickness));
			}
		}

		// Right line
		if (cl_cross_line_right->value) {
			gl.line(Vector2D(center.x + gap + size, center.y - offset), Vector2D(center.x + gap + size, center.y + offset));
			if (cl_cross_outline_inner->value == 0.0f)
			{
				gl.line(Vector2D(center.x + gap + size - half_width, center.y + half_thickness), Vector2D(center.x + gap, center.y + half_thickness));
				gl.line(Vector2D(center.x + gap, center.y - half_thickness), Vector2D(center.x + gap + size - half_width, center.y - half_thickness));
			}
			else
			{
				gl.line(Vector2D(center.x + gap + size - half_width, center.y + half_thickness), Vector2D(center.x + gap + half_width, center.y + half_thickness));
				gl.line(Vector2D(center.x + gap, center.y + offset), Vector2D(center.x + gap, center.y - offset));
				gl.line(Vector2D(center.x + gap + half_width, center.y - half_thickness), Vector2D(center.x + gap + size - half_width, center.y - half_thickness));
			}
		}

		// Dot
		if (cl_cross_dot_size->value > 0.0f && cl_cross_dot_outline->value > 0.0f) {
			auto size = cl_cross_dot_size->value;
			auto offset = Vector2D(size / 2.0f, size / 2.0f);
			auto dot_half_width = cl_cross_dot_outline->value / 2.0f;

			gl.line(Vector2D(center.x - offset.x - dot_half_width, center.y - offset.y), Vector2D(center.x + offset.x + dot_half_width, center.y - offset.y));
			gl.line(Vector2D(center.x + offset.x, center.y - offset.y + dot_half_width), Vector2D(center.x + offset.x, center.y + offset.y - dot_half_width));
			gl.line(Vector2D(center.x - offset.x, center.y - offset.y + dot_half_width), Vector2D(center.x - offset.x, center.y + offset.y - dot_half_width));
			gl.line(Vector2D(center.x - offset.x - dot_half_width, center.y + offset.y), Vector2D(center.x + offset.x + dot_half_width, center.y + offset.y));
		}
	}

	gl.color(r, g, b, alpha);

	// Draw the crosshairs.
	if (cl_cross_thickness->value > 0.0f) {
		gl.line_width(cl_cross_thickness->value);

		auto size = cl_cross_size->value;
		auto gap = cl_cross_gap->value;

		if (cl_cross_line_top->value)
			gl.line(Vector2D(center.x, center.y - gap - size), Vector2D(center.x, center.y - gap));
		if (cl_cross_line_bottom->value)
			gl.line(Vector2D(center.x, center.y + gap + size), Vector2D(center.x, center.y + gap));
		if (cl_cross_line_left->value)
			gl.line(Vector2D(center.x - gap - size, center.y), Vector2D(center.x - gap, center.y));
		if (cl_cross_line_right->value)
			gl.line(Vector2D(center.x + gap + size, center.y), Vector2D(center.x + gap, center.y));
	}

	// Draw the circle.
	if (cl_cross_circle_radius->value > 0.0f) {
		gl.line_width(1.0f);

		auto radius = cl_cross_circle_radius->value;
		if (old_circle_radius != radius) {
			// Recompute the circle points.
			circle_points = HudGL::compute_circle(radius);
			old_circle_radius = radius;
		}

		gl.circle(center, circle_points);
	}

	// Draw the dot.
	if (cl_cross_dot_size->value > 0.0f) {
		unsigned char r, g, b;
		if (sscanf(cl_cross_dot_color->string, "%hhu %hhu %hhu", &r, &g, &b) == 3)
			gl.color(r, g, b, alpha);

		auto size = cl_cross_dot_size->value;
		auto offset = Vector2D(size / 2.0f, size / 2.0f);

		gl.rectangle(center - offset, center + offset);
	}

	return 0;
}