Urho3D/Source/Samples/34_DynamicGeometry/DynamicGeometry.cpp
2020-01-05 06:21:40 +00:00

395 lines
15 KiB
C++

//
// Copyright (c) 2008-2020 the Urho3D project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
#include <Urho3D/Core/CoreEvents.h>
#include <Urho3D/Core/Profiler.h>
#include <Urho3D/Engine/Engine.h>
#include <Urho3D/Graphics/Camera.h>
#include <Urho3D/Graphics/Geometry.h>
#include <Urho3D/Graphics/Graphics.h>
#include <Urho3D/Graphics/IndexBuffer.h>
#include <Urho3D/Graphics/Light.h>
#include <Urho3D/Graphics/Model.h>
#include <Urho3D/Graphics/Octree.h>
#include <Urho3D/Graphics/Renderer.h>
#include <Urho3D/Graphics/StaticModel.h>
#include <Urho3D/Graphics/VertexBuffer.h>
#include <Urho3D/Graphics/Zone.h>
#include <Urho3D/Input/Input.h>
#include <Urho3D/IO/Log.h>
#include <Urho3D/Resource/ResourceCache.h>
#include <Urho3D/Scene/Scene.h>
#include <Urho3D/UI/Font.h>
#include <Urho3D/UI/Text.h>
#include <Urho3D/UI/UI.h>
#include "DynamicGeometry.h"
#include <Urho3D/DebugNew.h>
URHO3D_DEFINE_APPLICATION_MAIN(DynamicGeometry)
DynamicGeometry::DynamicGeometry(Context* context) :
Sample(context),
animate_(true),
time_(0.0f)
{
}
void DynamicGeometry::Start()
{
// Execute base class startup
Sample::Start();
// Create the scene content
CreateScene();
// Create the UI content
CreateInstructions();
// Setup the viewport for displaying the scene
SetupViewport();
// Hook up to the frame update events
SubscribeToEvents();
// Set the mouse mode to use in the sample
Sample::InitMouseMode(MM_RELATIVE);
}
void DynamicGeometry::CreateScene()
{
auto* cache = GetSubsystem<ResourceCache>();
scene_ = new Scene(context_);
// Create the Octree component to the scene so that drawable objects can be rendered. Use default volume
// (-1000, -1000, -1000) to (1000, 1000, 1000)
scene_->CreateComponent<Octree>();
// Create a Zone for ambient light & fog control
Node* zoneNode = scene_->CreateChild("Zone");
auto* zone = zoneNode->CreateComponent<Zone>();
zone->SetBoundingBox(BoundingBox(-1000.0f, 1000.0f));
zone->SetFogColor(Color(0.2f, 0.2f, 0.2f));
zone->SetFogStart(200.0f);
zone->SetFogEnd(300.0f);
// Create a directional light
Node* lightNode = scene_->CreateChild("DirectionalLight");
lightNode->SetDirection(Vector3(-0.6f, -1.0f, -0.8f)); // The direction vector does not need to be normalized
auto* light = lightNode->CreateComponent<Light>();
light->SetLightType(LIGHT_DIRECTIONAL);
light->SetColor(Color(0.4f, 1.0f, 0.4f));
light->SetSpecularIntensity(1.5f);
// Get the original model and its unmodified vertices, which are used as source data for the animation
auto* originalModel = cache->GetResource<Model>("Models/Box.mdl");
if (!originalModel)
{
URHO3D_LOGERROR("Model not found, cannot initialize example scene");
return;
}
// Get the vertex buffer from the first geometry's first LOD level
VertexBuffer* buffer = originalModel->GetGeometry(0, 0)->GetVertexBuffer(0);
const auto* vertexData = (const unsigned char*)buffer->Lock(0, buffer->GetVertexCount());
if (vertexData)
{
unsigned numVertices = buffer->GetVertexCount();
unsigned vertexSize = buffer->GetVertexSize();
// Copy the original vertex positions
for (unsigned i = 0; i < numVertices; ++i)
{
const Vector3& src = *reinterpret_cast<const Vector3*>(vertexData + i * vertexSize);
originalVertices_.Push(src);
}
buffer->Unlock();
// Detect duplicate vertices to allow seamless animation
vertexDuplicates_.Resize(originalVertices_.Size());
for (unsigned i = 0; i < originalVertices_.Size(); ++i)
{
vertexDuplicates_[i] = i; // Assume not a duplicate
for (unsigned j = 0; j < i; ++j)
{
if (originalVertices_[i].Equals(originalVertices_[j]))
{
vertexDuplicates_[i] = j;
break;
}
}
}
}
else
{
URHO3D_LOGERROR("Failed to lock the model vertex buffer to get original vertices");
return;
}
// Create StaticModels in the scene. Clone the model for each so that we can modify the vertex data individually
for (int y = -1; y <= 1; ++y)
{
for (int x = -1; x <= 1; ++x)
{
Node* node = scene_->CreateChild("Object");
node->SetPosition(Vector3(x * 2.0f, 0.0f, y * 2.0f));
auto* object = node->CreateComponent<StaticModel>();
SharedPtr<Model> cloneModel = originalModel->Clone();
object->SetModel(cloneModel);
// Store the cloned vertex buffer that we will modify when animating
animatingBuffers_.Push(SharedPtr<VertexBuffer>(cloneModel->GetGeometry(0, 0)->GetVertexBuffer(0)));
}
}
// Finally create one model (pyramid shape) and a StaticModel to display it from scratch
// Note: there are duplicated vertices to enable face normals. We will calculate normals programmatically
{
const unsigned numVertices = 18;
float vertexData[] = {
// Position Normal
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f
};
const unsigned short indexData[] = {
0, 1, 2,
3, 4, 5,
6, 7, 8,
9, 10, 11,
12, 13, 14,
15, 16, 17
};
// Calculate face normals now
for (unsigned i = 0; i < numVertices; i += 3)
{
Vector3& v1 = *(reinterpret_cast<Vector3*>(&vertexData[6 * i]));
Vector3& v2 = *(reinterpret_cast<Vector3*>(&vertexData[6 * (i + 1)]));
Vector3& v3 = *(reinterpret_cast<Vector3*>(&vertexData[6 * (i + 2)]));
Vector3& n1 = *(reinterpret_cast<Vector3*>(&vertexData[6 * i + 3]));
Vector3& n2 = *(reinterpret_cast<Vector3*>(&vertexData[6 * (i + 1) + 3]));
Vector3& n3 = *(reinterpret_cast<Vector3*>(&vertexData[6 * (i + 2) + 3]));
Vector3 edge1 = v1 - v2;
Vector3 edge2 = v1 - v3;
n1 = n2 = n3 = edge1.CrossProduct(edge2).Normalized();
}
SharedPtr<Model> fromScratchModel(new Model(context_));
SharedPtr<VertexBuffer> vb(new VertexBuffer(context_));
SharedPtr<IndexBuffer> ib(new IndexBuffer(context_));
SharedPtr<Geometry> geom(new Geometry(context_));
// Shadowed buffer needed for raycasts to work, and so that data can be automatically restored on device loss
vb->SetShadowed(true);
// We could use the "legacy" element bitmask to define elements for more compact code, but let's demonstrate
// defining the vertex elements explicitly to allow any element types and order
PODVector<VertexElement> elements;
elements.Push(VertexElement(TYPE_VECTOR3, SEM_POSITION));
elements.Push(VertexElement(TYPE_VECTOR3, SEM_NORMAL));
vb->SetSize(numVertices, elements);
vb->SetData(vertexData);
ib->SetShadowed(true);
ib->SetSize(numVertices, false);
ib->SetData(indexData);
geom->SetVertexBuffer(0, vb);
geom->SetIndexBuffer(ib);
geom->SetDrawRange(TRIANGLE_LIST, 0, numVertices);
fromScratchModel->SetNumGeometries(1);
fromScratchModel->SetGeometry(0, 0, geom);
fromScratchModel->SetBoundingBox(BoundingBox(Vector3(-0.5f, -0.5f, -0.5f), Vector3(0.5f, 0.5f, 0.5f)));
// Though not necessary to render, the vertex & index buffers must be listed in the model so that it can be saved properly
Vector<SharedPtr<VertexBuffer> > vertexBuffers;
Vector<SharedPtr<IndexBuffer> > indexBuffers;
vertexBuffers.Push(vb);
indexBuffers.Push(ib);
// Morph ranges could also be not defined. Here we simply define a zero range (no morphing) for the vertex buffer
PODVector<unsigned> morphRangeStarts;
PODVector<unsigned> morphRangeCounts;
morphRangeStarts.Push(0);
morphRangeCounts.Push(0);
fromScratchModel->SetVertexBuffers(vertexBuffers, morphRangeStarts, morphRangeCounts);
fromScratchModel->SetIndexBuffers(indexBuffers);
Node* node = scene_->CreateChild("FromScratchObject");
node->SetPosition(Vector3(0.0f, 3.0f, 0.0f));
auto* object = node->CreateComponent<StaticModel>();
object->SetModel(fromScratchModel);
}
// Create the camera
cameraNode_ = new Node(context_);
cameraNode_->SetPosition(Vector3(0.0f, 2.0f, -20.0f));
auto* camera = cameraNode_->CreateComponent<Camera>();
camera->SetFarClip(300.0f);
}
void DynamicGeometry::CreateInstructions()
{
auto* cache = GetSubsystem<ResourceCache>();
auto* ui = GetSubsystem<UI>();
// Construct new Text object, set string to display and font to use
auto* instructionText = ui->GetRoot()->CreateChild<Text>();
instructionText->SetText(
"Use WASD keys and mouse/touch to move\n"
"Space to toggle animation"
);
instructionText->SetFont(cache->GetResource<Font>("Fonts/Anonymous Pro.ttf"), 15);
// The text has multiple rows. Center them in relation to each other
instructionText->SetTextAlignment(HA_CENTER);
// Position the text relative to the screen center
instructionText->SetHorizontalAlignment(HA_CENTER);
instructionText->SetVerticalAlignment(VA_CENTER);
instructionText->SetPosition(0, ui->GetRoot()->GetHeight() / 4);
}
void DynamicGeometry::SetupViewport()
{
auto* renderer = GetSubsystem<Renderer>();
// Set up a viewport to the Renderer subsystem so that the 3D scene can be seen
SharedPtr<Viewport> viewport(new Viewport(context_, scene_, cameraNode_->GetComponent<Camera>()));
renderer->SetViewport(0, viewport);
}
void DynamicGeometry::SubscribeToEvents()
{
// Subscribe HandleUpdate() function for processing update events
SubscribeToEvent(E_UPDATE, URHO3D_HANDLER(DynamicGeometry, HandleUpdate));
}
void DynamicGeometry::MoveCamera(float timeStep)
{
// Do not move if the UI has a focused element (the console)
if (GetSubsystem<UI>()->GetFocusElement())
return;
auto* input = GetSubsystem<Input>();
// Movement speed as world units per second
const float MOVE_SPEED = 20.0f;
// Mouse sensitivity as degrees per pixel
const float MOUSE_SENSITIVITY = 0.1f;
// Use this frame's mouse motion to adjust camera node yaw and pitch. Clamp the pitch between -90 and 90 degrees
IntVector2 mouseMove = input->GetMouseMove();
yaw_ += MOUSE_SENSITIVITY * mouseMove.x_;
pitch_ += MOUSE_SENSITIVITY * mouseMove.y_;
pitch_ = Clamp(pitch_, -90.0f, 90.0f);
// Construct new orientation for the camera scene node from yaw and pitch. Roll is fixed to zero
cameraNode_->SetRotation(Quaternion(pitch_, yaw_, 0.0f));
// Read WASD keys and move the camera scene node to the corresponding direction if they are pressed
if (input->GetKeyDown(KEY_W))
cameraNode_->Translate(Vector3::FORWARD * MOVE_SPEED * timeStep);
if (input->GetKeyDown(KEY_S))
cameraNode_->Translate(Vector3::BACK * MOVE_SPEED * timeStep);
if (input->GetKeyDown(KEY_A))
cameraNode_->Translate(Vector3::LEFT * MOVE_SPEED * timeStep);
if (input->GetKeyDown(KEY_D))
cameraNode_->Translate(Vector3::RIGHT * MOVE_SPEED * timeStep);
}
void DynamicGeometry::AnimateObjects(float timeStep)
{
URHO3D_PROFILE(AnimateObjects);
time_ += timeStep * 100.0f;
// Repeat for each of the cloned vertex buffers
for (unsigned i = 0; i < animatingBuffers_.Size(); ++i)
{
float startPhase = time_ + i * 30.0f;
VertexBuffer* buffer = animatingBuffers_[i];
// Lock the vertex buffer for update and rewrite positions with sine wave modulated ones
// Cannot use discard lock as there is other data (normals, UVs) that we are not overwriting
auto* vertexData = (unsigned char*)buffer->Lock(0, buffer->GetVertexCount());
if (vertexData)
{
unsigned vertexSize = buffer->GetVertexSize();
unsigned numVertices = buffer->GetVertexCount();
for (unsigned j = 0; j < numVertices; ++j)
{
// If there are duplicate vertices, animate them in phase of the original
float phase = startPhase + vertexDuplicates_[j] * 10.0f;
Vector3& src = originalVertices_[j];
Vector3& dest = *reinterpret_cast<Vector3*>(vertexData + j * vertexSize);
dest.x_ = src.x_ * (1.0f + 0.1f * Sin(phase));
dest.y_ = src.y_ * (1.0f + 0.1f * Sin(phase + 60.0f));
dest.z_ = src.z_ * (1.0f + 0.1f * Sin(phase + 120.0f));
}
buffer->Unlock();
}
}
}
void DynamicGeometry::HandleUpdate(StringHash eventType, VariantMap& eventData)
{
using namespace Update;
// Take the frame time step, which is stored as a float
float timeStep = eventData[P_TIMESTEP].GetFloat();
// Toggle animation with space
auto* input = GetSubsystem<Input>();
if (input->GetKeyPress(KEY_SPACE))
animate_ = !animate_;
// Move the camera, scale movement with time step
MoveCamera(timeStep);
// Animate objects' vertex data if enabled
if (animate_)
AnimateObjects(timeStep);
}