From 6a5c90864dcddd924488c4b5ded34ab6bd7863dd Mon Sep 17 00:00:00 2001
From: Jonathan Bradley <jcb@pikum.xyz>
Date: Thu, 31 Aug 2023 14:00:32 -0400
Subject: first pass add ImGui console

---
 src/game.cpp | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'src/game.cpp')

diff --git a/src/game.cpp b/src/game.cpp
index cfb6d7c..a48cbfe 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1,8 +1,15 @@
 
 #include "game.hpp"
+#include "imgui.h"
 
 GameSettings pkeSettings{};
 
+const uint64_t consoleBufferCount = 30;
+const uint64_t consoleLineLength = 128;
+
+char consoleBuffer[consoleBufferCount][consoleLineLength];
+long consoleBufferIndex = 0;
+
 void GameTick(double delta) {
 	/*
 	 * ECS_Tick() gets called first because it updates the public
@@ -10,3 +17,47 @@ void GameTick(double delta) {
 	 */
 	ECS_Tick(delta);
 }
+
+void RecordImGuiConsole(bool *pOpen) {
+	static bool scrollToBottom = true;
+	if (!ImGui::Begin("Console", pOpen)) {
+		ImGui::End();
+		return;
+	}
+	ImVec2 region = ImGui::GetContentRegionAvail();
+	region.y -= 27;
+	if (ImGui::BeginListBox("##ConsoleHistory", region)) {
+		for (long i = consoleBufferIndex + 1; i < consoleBufferCount; ++i) {
+			ImGui::Text("%s", consoleBuffer[i]);
+		}
+		for (long i = 0; i < consoleBufferIndex; ++i) {
+			ImGui::Text("%s", consoleBuffer[i]);
+		}
+		if (scrollToBottom) ImGui::SetScrollHereY(1);
+		scrollToBottom = false;
+		ImGui::EndListBox();
+	}
+	ImGui::Separator();
+	if (ImGui::InputText("##ConsoleInput", consoleBuffer[consoleBufferIndex], consoleLineLength, ImGuiInputTextFlags_EnterReturnsTrue)) {
+		// TODO parse and execute.
+		scrollToBottom = true;
+		consoleBufferIndex = (consoleBufferIndex + 1) % consoleBufferCount;
+		memset(consoleBuffer[consoleBufferIndex], '\0', consoleLineLength);
+	}
+	auto flags = (ImGuiFocusedFlags_ChildWindows);
+	if (ImGui::IsWindowFocused(flags) && !ImGui::IsAnyItemFocused() && !ImGui::IsMouseClicked(ImGuiMouseButton_Left) && !ImGui::IsMouseClicked(ImGuiMouseButton_Left, true)) {
+		ImGui::SetKeyboardFocusHere(-1);
+	}
+	ImGui::End();
+}
+
+void RecordImGuiEditor() {
+	RecordImGuiConsole(&pkeSettings.isShowingEditor);
+}
+
+void GameInit() {
+	for (long i = 0; i < consoleBufferCount; ++i) {
+		memset(consoleBuffer[i], '\0', consoleLineLength);
+	}
+	RegisterCallback("RenderImGui", RecordImGuiEditor);
+}
-- 
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