From 2da9efc1037fba0461303327151318b8edf4dfc7 Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Thu, 29 Oct 2015 16:05:01 +0100
Subject: [PATCH] render entity bounds in debug mode

---
 src/client/client.cpp          |  3 +++
 src/graphics/PrimitiveMesh.hpp |  7 +++++++
 src/graphics/mesh.cpp          | 24 ++++++++++++++++++++++++
 src/standalone/MasterState.cpp |  3 +++
 src/world/World.hpp            |  1 +
 src/world/world.cpp            | 22 +++++++++++++++++++++-
 6 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/src/client/client.cpp b/src/client/client.cpp
index 8bd0ae3..5a34976 100644
--- a/src/client/client.cpp
+++ b/src/client/client.cpp
@@ -193,6 +193,9 @@ void InteractiveState::Render(Viewport &viewport) {
 	if (master.GetConfig().video.world) {
 		chunk_renderer.Render(viewport);
 		world.Render(viewport);
+		if (master.GetConfig().video.debug) {
+			world.RenderDebug(viewport);
+		}
 		sky.Render(viewport);
 	}
 	hud.Render(viewport);
diff --git a/src/graphics/PrimitiveMesh.hpp b/src/graphics/PrimitiveMesh.hpp
index 1aa3cce..013bf37 100644
--- a/src/graphics/PrimitiveMesh.hpp
+++ b/src/graphics/PrimitiveMesh.hpp
@@ -10,6 +10,8 @@
 
 namespace blank {
 
+struct AABB;
+
 class PrimitiveMesh {
 
 public:
@@ -52,6 +54,11 @@ public:
 			const glm::vec2 &pivot = glm::vec2(0.0f)
 		);
 
+		void OutlineBox(
+			const AABB &,
+			const glm::vec4 &color = glm::vec4(0.0f)
+		);
+
 	};
 
 	using VAO = VertexArray<ATTRIB_COUNT>;
diff --git a/src/graphics/mesh.cpp b/src/graphics/mesh.cpp
index 3aa631e..4a63d99 100644
--- a/src/graphics/mesh.cpp
+++ b/src/graphics/mesh.cpp
@@ -4,6 +4,8 @@
 #include "SkyBoxMesh.hpp"
 #include "SpriteMesh.hpp"
 
+#include "../model/geometry.hpp"
+
 #include <algorithm>
 #include <iostream>
 
@@ -90,6 +92,28 @@ void PrimitiveMesh::Buffer::FillRect(
 	indices.assign({ 0, 2, 1, 1, 2, 3 });
 }
 
+void PrimitiveMesh::Buffer::OutlineBox(const AABB &box, const glm::vec4 &color) {
+	Clear();
+	Reserve(8, 24);
+
+	vertices.emplace_back(box.min.x, box.min.y, box.min.z);
+	vertices.emplace_back(box.min.x, box.min.y, box.max.z);
+	vertices.emplace_back(box.min.x, box.max.y, box.min.z);
+	vertices.emplace_back(box.min.x, box.max.y, box.max.z);
+	vertices.emplace_back(box.max.x, box.min.y, box.min.z);
+	vertices.emplace_back(box.max.x, box.min.y, box.max.z);
+	vertices.emplace_back(box.max.x, box.max.y, box.min.z);
+	vertices.emplace_back(box.max.x, box.max.y, box.max.z);
+
+	colors.resize(8, color);
+
+	indices.assign({
+		0, 1, 1, 3, 3, 2, 2, 0, // left
+		4, 5, 5, 7, 7, 6, 6, 4, // right
+		0, 4, 1, 5, 3, 7, 2, 6, // others
+	});
+}
+
 
 void PrimitiveMesh::Update(const Buffer &buf) noexcept {
 #ifndef NDEBUG
diff --git a/src/standalone/MasterState.cpp b/src/standalone/MasterState.cpp
index 71117e2..e802703 100644
--- a/src/standalone/MasterState.cpp
+++ b/src/standalone/MasterState.cpp
@@ -162,6 +162,9 @@ void MasterState::Render(Viewport &viewport) {
 	if (config.video.world) {
 		chunk_renderer.Render(viewport);
 		world.Render(viewport);
+		if (config.video.debug) {
+			world.RenderDebug(viewport);
+		}
 		sky.Render(viewport);
 	}
 	hud.Render(viewport);
diff --git a/src/world/World.hpp b/src/world/World.hpp
index e29474e..7ee5f43 100644
--- a/src/world/World.hpp
+++ b/src/world/World.hpp
@@ -101,6 +101,7 @@ public:
 	void Update(Entity &, float dt);
 
 	void Render(Viewport &);
+	void RenderDebug(Viewport &);
 
 private:
 	using EntityHandle = std::list<Entity>::iterator;
diff --git a/src/world/world.cpp b/src/world/world.cpp
index 3f5740e..f472da9 100644
--- a/src/world/world.cpp
+++ b/src/world/world.cpp
@@ -666,7 +666,27 @@ void World::Render(Viewport &viewport) {
 	entity_prog.SetFogDensity(fog_density);
 
 	for (Entity &entity : entities) {
-		entity.Render(entity.Transform(players.front().GetEntity().ChunkCoords()), entity_prog);
+		glm::mat4 M(entity.Transform(players.front().GetEntity().ChunkCoords()));
+		if (!CullTest(entity.Bounds(), entity_prog.GetVP() * M)) {
+			entity.Render(M, entity_prog);
+		}
+	}
+}
+
+namespace {
+
+PrimitiveMesh::Buffer debug_buf;
+
+}
+
+void World::RenderDebug(Viewport &viewport) {
+	PrimitiveMesh debug_mesh;
+	PlainColor &prog = viewport.WorldColorProgram();
+	for (const Entity &entity : entities) {
+		debug_buf.OutlineBox(entity.Bounds(), glm::vec4(1.0f, 0.0f, 0.0f, 1.0f));
+		debug_mesh.Update(debug_buf);
+		prog.SetM(entity.Transform(players.front().GetEntity().ChunkCoords()));
+		debug_mesh.DrawLines();
 	}
 }
 
-- 
2.39.2