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#include "TechTreeArcs.h"
#include "../util/Logger.h"
#include "../Empire/Empire.h"
#include "../Empire/EmpireManager.h"
#include "../universe/Tech.h"
#include "../client/human/GGHumanClientApp.h"
#include "TechTreeLayout.h"
#include <GG/ClrConstants.h>
#include <GG/GLClientAndServerBuffer.h>
#include <GG/DrawUtil.h>
#include <boost/graph/graph_concepts.hpp>
namespace {
constexpr float ARC_THICKNESS = 3.0;
}
/////////////////////////////////
//// Implementation ////////////
///////////////////////////////
class TechTreeArcs::Impl {
public:
Impl(const TechTreeLayout& layout, const std::set<std::string>& techs_to_show) :
m_layout(layout)
{
FillArcBuffer(m_buffer, techs_to_show);
RefreshHighlights();
}
void Render(double scale) {
// draw arcs with thick, half-alpha line
GG::Clr arc_colour = GG::CLR_GRAY; arc_colour.a = 127;
// redraw thicker highlight arcs
GG::Clr arc_highlight_colour = GG::CLR_WHITE; arc_highlight_colour.a = 127;
glEnable(GL_LINE_SMOOTH);
glDisable(GL_TEXTURE_2D);
glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
glEnableClientState(GL_VERTEX_ARRAY);
// First draw transparent wide lines
//Normal lines
glColor(arc_colour);
glLineWidth(ARC_THICKNESS * scale);
m_buffer.activate();
glDrawArrays(GL_LINES, 0, m_buffer.size());
// Highlights
glColor(arc_highlight_colour);
glLineWidth(ARC_THICKNESS * scale * 2);
m_highlight_buffer.activate();
glDrawArrays(GL_LINES, 0, m_highlight_buffer.size());
// Next we draw opaque thinner lines
// Normal lines
arc_colour.a = 255;
glColor(arc_colour);
glLineWidth(ARC_THICKNESS * scale * 0.5);
m_buffer.activate();
glDrawArrays(GL_LINES, 0, m_buffer.size());
// Highlights
arc_highlight_colour.a = 255;
glColor(arc_highlight_colour);
glLineWidth(ARC_THICKNESS * scale);
m_highlight_buffer.activate();
glDrawArrays(GL_LINES, 0, m_highlight_buffer.size());
glLineWidth(1.0);
glPopClientAttrib();
glEnable(GL_TEXTURE_2D);
}
// Fill m_highlight_buffer with the lines that should be highlighted
void RefreshHighlights() {
std::set<std::string> highlights;
// We highlight lines that lead to techs that are queued for research
if (const Empire* empire = GetEmpire(GGHumanClientApp::GetApp()->EmpireID())) {
const ResearchQueue& queue = empire->GetResearchQueue();
for (const auto& edge : m_edges_to_show) {
auto& tech1 = edge.first;
auto& heads = edge.second;
for (auto& head : heads) {
if (queue.InQueue(head) && (
queue.InQueue(tech1) || empire->GetTechStatus(tech1) == TechStatus::TS_COMPLETE))
{
// FillArcBuffer will put lines whose both ends are in highlights
// into the buffer
highlights.emplace(tech1);
highlights.emplace(head);
}
}
}
}
FillArcBuffer(m_highlight_buffer, highlights);
}
private:
const TechTreeLayout& m_layout;
std::map<std::string, std::set<std::string>> m_edges_to_show;
GG::GL2DVertexBuffer m_buffer;
GG::GL2DVertexBuffer m_highlight_buffer;
/// Fills \a buffer with the ends points for the lines that connect
/// technologies in \a techs
void FillArcBuffer(GG::GL2DVertexBuffer& buffer, const std::set<std::string>& techs) {
for (const std::string& tech_name : techs) {
//prerequisite edge
for (const auto& edge : m_layout.GetOutEdges(tech_name)) {
const auto& from = edge.GetTechFrom();
const auto& to = edge.GetTechTo();
// Do not show lines leading to techs we are not showing
if (!techs.contains(to))
continue;
// Remember what edges we are showing so we can eventually highlight them
m_edges_to_show[from].insert(to);
if (!GetTech(from) || !GetTech(to)) {
ErrorLogger() << "TechTreeArcs::FillArcBuffer missing arc endpoint tech " << from << "->" << to;
continue;
}
const auto& points = edge.Points();
if (points.empty())
continue;
const auto pts_sz_m1 = points.size() - 1u;
// To be able to draw all the lines in one call,
// we will draw the with GL_LINES, which means all
// vertices except the first and the last must occur twice
for (std::size_t i = 0u; i < pts_sz_m1; ++i) {
buffer.store(points[i].first, points[i].second);
buffer.store(points[i+1].first, points[i+1].second);
}
}
}
buffer.createServerBuffer();
}
};
TechTreeArcs::TechTreeArcs() = default;
TechTreeArcs::TechTreeArcs(const TechTreeLayout& layout, const std::set<std::string>& techs_to_show) :
m_impl(std::make_unique<Impl>(layout, techs_to_show))
{}
TechTreeArcs::~TechTreeArcs() = default;
void TechTreeArcs::Render(double scale) {
if (m_impl)
m_impl->Render(scale);
}
void TechTreeArcs::Reset()
{ m_impl.reset(); }
void TechTreeArcs::Reset(const TechTreeLayout& layout, const std::set< std::string >& techs_to_show)
{ m_impl = std::make_unique<Impl>(layout, techs_to_show); }
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