Merge pull request #3 from xLightling/a4_transform

A4: Transforms

BufferStructs.h

@@ -5,5 +5,5 @@
 struct VertexShaderExternalData
 {
 	DirectX::XMFLOAT4 colorTint;
-	DirectX::XMFLOAT3 offset;
+	DirectX::XMFLOAT4X4 world;
 };

DX11Starter.vcxproj

@@ -124,17 +124,21 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="DXCore.cpp" />
+    <ClCompile Include="Entity.cpp" />
     <ClCompile Include="Game.cpp" />
     <ClCompile Include="Input.cpp" />
     <ClCompile Include="Main.cpp" />
     <ClCompile Include="Mesh.cpp" />
+    <ClCompile Include="Transform.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="BufferStructs.h" />
     <ClInclude Include="DXCore.h" />
+    <ClInclude Include="Entity.h" />
     <ClInclude Include="Game.h" />
     <ClInclude Include="Input.h" />
     <ClInclude Include="Mesh.h" />
+    <ClInclude Include="Transform.h" />
     <ClInclude Include="Vertex.h" />
   </ItemGroup>
   <ItemGroup>

DX11Starter.vcxproj.filters

@@ -33,6 +33,12 @@
     <ClCompile Include="Mesh.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="Transform.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="Entity.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Vertex.h">
@@ -53,6 +59,12 @@
     <ClInclude Include="BufferStructs.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="Transform.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="Entity.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <FxCompile Include="PixelShader.hlsl">

Entity.cpp

@@ -0,0 +1,16 @@
+#include "Entity.h"
+
+Entity::Entity(std::shared_ptr<Mesh> _mesh)
+{
+	mesh = _mesh;
+}
+
+Transform* Entity::GetTransform()
+{
+	return &transform;
+}
+
+std::shared_ptr<Mesh> Entity::GetMesh()
+{
+	return mesh;
+}

Entity.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "Mesh.h"
+#include "Transform.h"
+#include <memory>
+
+class Entity
+{
+public:
+	Entity(std::shared_ptr<Mesh> _mesh);
+
+	Transform* GetTransform();
+	std::shared_ptr<Mesh> GetMesh();
+
+private:
+	Transform transform;
+	std::shared_ptr<Mesh> mesh;
+};

Game.cpp

@@ -197,6 +197,18 @@ void Game::CreateBasicGeometry()
 		std::make_shared<Mesh>(verts2, 04, ind2, 06, device, context),
 		std::make_shared<Mesh>(verts3, 06, ind3, 12, device, context),
 	};
+
+	entities = {
+		std::make_shared<Entity>(shapes[0]),
+		std::make_shared<Entity>(shapes[0]),
+		std::make_shared<Entity>(shapes[0]),
+		std::make_shared<Entity>(shapes[1]),
+		std::make_shared<Entity>(shapes[1]),
+		std::make_shared<Entity>(shapes[1]),
+		std::make_shared<Entity>(shapes[2]),
+		std::make_shared<Entity>(shapes[2]),
+		std::make_shared<Entity>(shapes[2]),
+	};
 }
 
 
@@ -218,17 +230,53 @@ void Game::Update(float deltaTime, float totalTime)
 	// Example input checking: Quit if the escape key is pressed
 	if (Input::GetInstance().KeyDown(VK_ESCAPE))
 		Quit();
+
+	for (int i = 0; i < entities.size(); ++i)
+	{
+		entities[i]->GetTransform()->SetScale(0.1f * (i + 1), 0.1f * (i + 1), 0.1f * (i + 1));
+		entities[i]->GetTransform()->SetRotation(0.1f * (i + 1) * sin(totalTime), 0.1f * (i + 1) * sin(totalTime), 0.1f * (i + 1) * sin(totalTime));
+		// this range uses shapes[0] for testing
+		if (i < 3)
+		{
+			entities[i]->GetTransform()->SetPosition(tan((double)totalTime * ((double)i + (double)1)) * 0.1f, 0, 0);
+		}
+		// this range uses shapes[1] for testing
+		else if (i < 6)
+		{
+			entities[i]->GetTransform()->SetPosition(sin((double)totalTime * ((double)i + (double)1)) * 0.1f, 0, 0);
+		}
+		// this range uses shapes[2] for testing
+		else
+		{
+			entities[i]->GetTransform()->SetPosition(sin((double)totalTime * ((double)i + (double)1)) * cos(totalTime) * 0.1f, 0, 0);
+		}
+	}
 }
 
 // --------------------------------------------------------
 // Clear the screen, redraw everything, present to the user
 // --------------------------------------------------------
 void Game::Draw(float deltaTime, float totalTime)
+{
+	// Background color (Cornflower Blue in this case) for clearing
+	static const float color[4] = { 0.4f, 0.6f, 0.75f, 0.0f };
+
+	// Clear the render target and depth buffer (erases what's on the screen)
+	//  - Do this ONCE PER FRAME
+	//  - At the beginning of Draw (before drawing *anything*)
+	context->ClearRenderTargetView(backBufferRTV.Get(), color);
+	context->ClearDepthStencilView(
+		depthStencilView.Get(),
+		D3D11_CLEAR_DEPTH | D3D11_CLEAR_STENCIL,
+		1.0f,
+		0);
+
+	for (auto entity : entities)
 	{
 		// create constant buffer
 		VertexShaderExternalData vsData;
 		vsData.colorTint = XMFLOAT4(1.0f, 0.5f, 0.5f, 1.0f);
-	vsData.offset = XMFLOAT3(0.25f, 0.0f, 0.0f);
+		vsData.world = entity->GetTransform()->GetWorldMatrix();
 
 		// copy constant buffer to resource
 		D3D11_MAPPED_SUBRESOURCE mappedBuffer = {};
@@ -243,20 +291,6 @@ void Game::Draw(float deltaTime, float totalTime)
 			constantBufferVS.GetAddressOf() // Array of buffers (or address of one)
 		);
 
-	// Background color (Cornflower Blue in this case) for clearing
-	const float color[4] = { 0.4f, 0.6f, 0.75f, 0.0f };
-
-	// Clear the render target and depth buffer (erases what's on the screen)
-	//  - Do this ONCE PER FRAME
-	//  - At the beginning of Draw (before drawing *anything*)
-	context->ClearRenderTargetView(backBufferRTV.Get(), color);
-	context->ClearDepthStencilView(
-		depthStencilView.Get(),
-		D3D11_CLEAR_DEPTH | D3D11_CLEAR_STENCIL,
-		1.0f,
-		0);
-
-
 		// Set the vertex and pixel shaders to use for the next Draw() command
 		//  - These don't technically need to be set every frame
 		//  - Once you start applying different shaders to different objects,
@@ -264,7 +298,6 @@ void Game::Draw(float deltaTime, float totalTime)
 		context->VSSetShader(vertexShader.Get(), 0, 0);
 		context->PSSetShader(pixelShader.Get(), 0, 0);
 
-
 		// Ensure the pipeline knows how to interpret the data (numbers)
 		// from the vertex buffer.  
 		// - If all of your 3D models use the exact same vertex layout,
@@ -272,9 +305,7 @@ void Game::Draw(float deltaTime, float totalTime)
 		// - However, this isn't always the case (but might be for this course)
 		context->IASetInputLayout(inputLayout.Get());
 
-	for (int i = 0; i < shapes.size(); ++i)
-	{
-		shapes[i]->Draw();
+		entity->GetMesh()->Draw();
 	}
 
 	// Present the back buffer to the user

Game.h

@@ -2,6 +2,7 @@
 
 #include "DXCore.h"
 #include "Mesh.h"
+#include "Entity.h"
 #include <DirectXMath.h>
 #include <wrl/client.h> // Used for ComPtr - a smart pointer for COM objects
 #include <memory>
@@ -43,6 +44,8 @@ private:
 
 	// Temporary A2 shapes
 	std::vector<std::shared_ptr<Mesh>> shapes;
+	// Temporary A3 entities;
+	std::vector<std::shared_ptr<Entity>> entities;
 
 	Microsoft::WRL::ComPtr<ID3D11Buffer> constantBufferVS;
 };

Transform.cpp

@@ -0,0 +1,96 @@
+#include "Transform.h"
+
+using namespace DirectX;
+
+Transform::Transform()
+{
+	SetPosition(0, 0, 0);
+	SetRotation(0, 0, 0);
+	SetScale(1, 1, 1);
+
+	XMStoreFloat4x4(&worldMatrix, XMMatrixIdentity());
+	XMStoreFloat4x4(&worldMatrixInverseTranspose, XMMatrixIdentity());
+	worldMatrixChanged = false;
+}
+
+DirectX::XMFLOAT3 Transform::GetPosition()		{ return position; }
+DirectX::XMFLOAT3 Transform::GetEulerAngles()	{ return eulerAngles; }
+DirectX::XMFLOAT3 Transform::GetPitchYawRoll()	{ return eulerAngles;  }
+DirectX::XMFLOAT3 Transform::GetScale()			{ return scale; }
+
+DirectX::XMFLOAT4X4 Transform::GetWorldMatrix()
+{
+	if (worldMatrixChanged)
+	{
+		UpdateWorldMatrix();
+		worldMatrixChanged = false;
+	}
+	return worldMatrix;
+}
+
+DirectX::XMFLOAT4X4 Transform::GetWorldMatrixInverseTranspose()
+{
+	if (worldMatrixChanged)
+	{
+		UpdateWorldMatrix();
+		worldMatrixChanged = false;
+	}
+	return worldMatrixInverseTranspose;
+}
+
+// XMVECTOR & XMStoreFloat compiles down to something faster than position += x,y,z because it happens all at once
+
+void Transform::SetPosition(float _x, float _y, float _z)
+{
+	XMVECTOR newPosition = XMVectorSet(_x, _y, _z, 0);
+	XMStoreFloat3(&position, newPosition);
+	worldMatrixChanged = true;
+}
+
+void Transform::SetRotation(float _pitch, float _yaw, float _roll)
+{
+	XMVECTOR newRotation = XMVectorSet(_pitch, _yaw, _roll, 0);
+	XMStoreFloat3(&eulerAngles, newRotation);
+	worldMatrixChanged = true;
+}
+
+void Transform::SetScale(float _x, float _y, float _z)
+{
+	XMVECTOR newScale = XMVectorSet(_x, _y, _z, 0);
+	XMStoreFloat3(&scale, newScale);
+	worldMatrixChanged = true;
+}
+
+void Transform::TranslateAbsolute(float _x, float _y, float _z)
+{
+	XMVECTOR newPosition = XMLoadFloat3(&position);
+	XMVECTOR offset = XMVectorSet(_x, _y, _z, 0);
+	XMStoreFloat3(&position, newPosition + offset);
+	worldMatrixChanged = true;
+}
+
+void Transform::Rotate(float _pitch, float _yaw, float _roll)
+{
+	XMVECTOR newRotation = XMLoadFloat3(&position);
+	XMVECTOR offset = XMVectorSet(_pitch, _yaw, _roll, 0);
+	XMStoreFloat3(&eulerAngles, newRotation + offset);
+	worldMatrixChanged = true;
+}
+
+void Transform::Scale(float _x, float _y, float _z)
+{
+	XMVECTOR newScale = XMLoadFloat3(&position);
+	XMVECTOR offset = XMVectorSet(_x, _y, _z, 0);
+	XMStoreFloat3(&scale, newScale + offset);
+	worldMatrixChanged = true;
+}
+
+void Transform::UpdateWorldMatrix()
+{
+	XMMATRIX matrixPosition = XMMatrixTranslation(position.x, position.y, position.z);
+	XMMATRIX matrixRotation = XMMatrixRotationRollPitchYaw(eulerAngles.x, eulerAngles.y, eulerAngles.z);
+	XMMATRIX matrixScale = XMMatrixScaling(scale.x, scale.y, scale.z);
+
+	XMStoreFloat4x4(&worldMatrix, matrixScale * matrixRotation * matrixPosition);
+	XMStoreFloat4x4(&worldMatrixInverseTranspose, XMMatrixInverse(0, XMMatrixTranspose(XMLoadFloat4x4(&worldMatrix))));
+}

Transform.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <DirectXMath.h>
+
+class Transform
+{
+public:
+	Transform();
+
+	DirectX::XMFLOAT3		GetPosition();
+	DirectX::XMFLOAT3		GetEulerAngles();
+	DirectX::XMFLOAT3		GetPitchYawRoll(); // an alternative name for euler angles in case preferred
+	DirectX::XMFLOAT3		GetScale();
+	DirectX::XMFLOAT4X4		GetWorldMatrix();
+	DirectX::XMFLOAT4X4		GetWorldMatrixInverseTranspose();
+
+	void					SetPosition(float _x, float _y, float _z);
+	void					SetRotation(float _pitch, float _yaw, float _roll);
+	void					SetScale(float _x, float _y, float _z);
+
+	void					TranslateAbsolute(float _x, float _y, float _z);
+	void					Rotate(float _pitch, float _yaw, float _roll);
+	void					Scale(float _x, float _y, float _z);
+
+private:
+	DirectX::XMFLOAT3		position;
+	DirectX::XMFLOAT3		eulerAngles;
+	DirectX::XMFLOAT3		scale;
+	DirectX::XMFLOAT4X4		worldMatrix;
+	DirectX::XMFLOAT4X4		worldMatrixInverseTranspose;
+	bool					worldMatrixChanged;
+
+	void					UpdateWorldMatrix();
+};

VertexShader.hlsl

@@ -1,7 +1,7 @@
 cbuffer ExternalData : register(b0)
 {
 	float4 colorTint;
-	float3 offset;
+	matrix world;
 }
 
 // Struct representing a single vertex worth of data
@@ -56,7 +56,7 @@ VertexToPixel main( VertexShaderInput input )
 	// - Each of these components is then automatically divided by the W component, 
 	//   which we're leaving at 1.0 for now (this is more useful when dealing with 
 	//   a perspective projection matrix, which we'll get to in the future).
-	output.screenPosition = float4(input.localPosition + offset, 1.0f);
+	output.screenPosition = mul(world, float4(input.localPosition, 1.0f));
 
 	// Pass the color through 
 	// - The values will be interpolated per-pixel by the rasterizer