define Sky.cpp / Sky.h and Game::CreateCubemap

Game.cpp

@@ -250,3 +250,112 @@ void Game::Draw(float deltaTime, float totalTime)
 	// the render target must be re-bound after every call to Present()
 	context->OMSetRenderTargets(1, backBufferRTV.GetAddressOf(), depthStencilView.Get());
 }
+
+// --------------------------------------------------------
+// Loads six individual textures (the six faces of a cube map), then
+// creates a blank cube map and copies each of the six textures to
+// another face.  Afterwards, creates a shader resource view for
+// the cube map and cleans up all of the temporary resources.
+// --------------------------------------------------------
+Microsoft::WRL::ComPtr<ID3D11ShaderResourceView> Game::CreateCubemap(
+	Microsoft::WRL::ComPtr<ID3D11Device> device,
+	Microsoft::WRL::ComPtr<ID3D11DeviceContext> context,
+	const wchar_t* right,
+	const wchar_t* left,
+	const wchar_t* up,
+	const wchar_t* down,
+	const wchar_t* front,
+	const wchar_t* back)
+{
+
+// --------------------------------------------------------
+// Author: Chris Cascioli
+// Purpose: Creates a cube map on the GPU from 6 individual textures
+//
+// - You are allowed to directly copy/paste this into your code base
+//   for assignments, given that you clearly cite that this is not
+//   code of your own design.
+//
+// - Note: This code assumes you’re putting the function in Game.cpp,
+//   you’ve included WICTextureLoader.h and you have an ID3D11Device
+//   ComPtr called “device”. Make any adjustments necessary for
+//   your own implementation.
+// --------------------------------------------------------
+
+	// Load the 6 textures into an array.
+	// - We need references to the TEXTURES, not the SHADER RESOURCE VIEWS!
+	// - Specifically NOT generating mipmaps, as we usually don't need them for the sky!
+	// - Order matters here!  +X, -X, +Y, -Y, +Z, -Z
+	ID3D11Texture2D* textures[6] = {};
+	CreateWICTextureFromFile(device.Get(), right, (ID3D11Resource**)&textures[0], 0);
+	CreateWICTextureFromFile(device.Get(), left, (ID3D11Resource**)&textures[1], 0);
+	CreateWICTextureFromFile(device.Get(), up, (ID3D11Resource**)&textures[2], 0);
+	CreateWICTextureFromFile(device.Get(), down, (ID3D11Resource**)&textures[3], 0);
+	CreateWICTextureFromFile(device.Get(), front, (ID3D11Resource**)&textures[4], 0);
+	CreateWICTextureFromFile(device.Get(), back, (ID3D11Resource**)&textures[5], 0);
+
+	// We'll assume all of the textures are the same color format and resolution,
+	// so get the description of the first shader resource view
+	D3D11_TEXTURE2D_DESC faceDesc = {};
+	textures[0]->GetDesc(&faceDesc);
+
+	// Describe the resource for the cube map, which is simply
+	// a "texture 2d array".  This is a special GPU resource format,
+	// NOT just a C++ array of textures!!!
+	D3D11_TEXTURE2D_DESC cubeDesc = {};
+	cubeDesc.ArraySize = 6; // Cube map!
+	cubeDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE; // We'll be using as a texture in a shader
+	cubeDesc.CPUAccessFlags = 0; // No read back
+	cubeDesc.Format = faceDesc.Format; // Match the loaded texture's color format
+	cubeDesc.Width = faceDesc.Width;  // Match the size
+	cubeDesc.Height = faceDesc.Height; // Match the size
+	cubeDesc.MipLevels = 1; // Only need 1
+	cubeDesc.MiscFlags = D3D11_RESOURCE_MISC_TEXTURECUBE; // A CUBE MAP, not 6 separate textures
+	cubeDesc.Usage = D3D11_USAGE_DEFAULT; // Standard usage
+	cubeDesc.SampleDesc.Count = 1;
+	cubeDesc.SampleDesc.Quality = 0;
+
+	// Create the actual texture resource
+	ID3D11Texture2D* cubeMapTexture = 0;
+	device->CreateTexture2D(&cubeDesc, 0, &cubeMapTexture);
+
+	// Loop through the individual face textures and copy them,
+	// one at a time, to the cube map texure
+	for (int i = 0; i < 6; i++)
+	{
+		// Calculate the subresource position to copy into
+		unsigned int subresource = D3D11CalcSubresource(
+			0,	// Which mip (zero, since there's only one)
+			i,	// Which array element?
+			1); 	// How many mip levels are in the texture?
+
+		// Copy from one resource (texture) to another
+		context->CopySubresourceRegion(
+			cubeMapTexture, // Destination resource
+			subresource,	// Dest subresource index (one of the array elements)
+			0, 0, 0,		// XYZ location of copy
+			textures[i],	// Source resource
+			0,	// Source subresource index (we're assuming there's only one)
+			0);	// Source subresource "box" of data to copy (zero means the whole thing)
+	}
+
+	// At this point, all of the faces have been copied into the
+	// cube map texture, so we can describe a shader resource view for it
+	D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc = {};
+	srvDesc.Format = cubeDesc.Format; 	// Same format as texture
+	srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURECUBE; // Treat this as a cube!
+	srvDesc.TextureCube.MipLevels = 1;	// Only need access to 1 mip
+	srvDesc.TextureCube.MostDetailedMip = 0; // Index of the first mip we want to see
+
+	// Make the SRV
+	Microsoft::WRL::ComPtr<ID3D11ShaderResourceView> cubeSRV;
+	device->CreateShaderResourceView(cubeMapTexture, &srvDesc, cubeSRV.GetAddressOf());
+
+	// Now that we're done, clean up the stuff we don't need anymore
+	cubeMapTexture->Release();  // Done with this particular reference (the SRV has another)
+	for (int i = 0; i < 6; i++)
+		textures[i]->Release();
+
+	// Send back the SRV, which is what we need for our shaders
+	return cubeSRV;
+}

Game.h

@@ -24,6 +24,16 @@ public:
 	void															Update(float deltaTime, float totalTime);
 	void															Draw(float deltaTime, float totalTime);
 
+	static Microsoft::WRL::ComPtr<ID3D11ShaderResourceView>			CreateCubemap(
+																		Microsoft::WRL::ComPtr<ID3D11Device> _device,
+																		Microsoft::WRL::ComPtr<ID3D11DeviceContext> _context,
+																		const wchar_t* _right,
+																		const wchar_t* _left,
+																		const wchar_t* _up,
+																		const wchar_t* _down,
+																		const wchar_t* _front,
+																		const wchar_t* _back);
+
 private:
 	// Should we use vsync to limit the frame rate?
 	bool vsync;

Sky.cpp

@@ -0,0 +1,43 @@
+#include "Sky.h"
+
+Sky::Sky(std::shared_ptr<Mesh> _mesh, Microsoft::WRL::ComPtr<ID3D11ShaderResourceView> _cubemap, Microsoft::WRL::ComPtr<ID3D11SamplerState> _sampler, Microsoft::WRL::ComPtr<ID3D11Device> _device)
+{
+	mesh = _mesh;
+	cubemap = _cubemap;
+	sampler = _sampler;
+
+	D3D11_RASTERIZER_DESC rDesc = {};
+	rDesc.FillMode = D3D11_FILL_SOLID;
+	rDesc.CullMode = D3D11_CULL_FRONT;
+	_device->CreateRasterizerState(&rDesc, rasterizerState.GetAddressOf());
+
+	D3D11_DEPTH_STENCIL_DESC dDesc = {};
+	dDesc.DepthEnable = true;
+	dDesc.DepthFunc = D3D11_COMPARISON_LESS_EQUAL;
+	_device->CreateDepthStencilState(&dDesc, depthState.GetAddressOf());
+}
+
+Sky::~Sky()
+{
+}
+
+void Sky::Draw(Microsoft::WRL::ComPtr<ID3D11DeviceContext> _context, Camera* _camera)
+{
+	_context->RSSetState(rasterizerState.Get());
+	_context->OMSetDepthStencilState(depthState.Get(), 0);
+
+	vertexShader->SetMatrix4x4("view", _camera->GetViewMatrix());
+	vertexShader->SetMatrix4x4("projection", _camera->GetProjectionMatrix());
+	vertexShader->CopyAllBufferData();
+	vertexShader->SetShader();
+
+	pixelShader->SetShaderResourceView("SkyTexture", cubemap.Get());
+	pixelShader->SetSamplerState("Sampler", sampler.Get());
+	pixelShader->CopyAllBufferData();
+	pixelShader->SetShader();
+
+	mesh->Draw();
+
+	_context->RSSetState(0);
+	_context->OMSetDepthStencilState(0, 0);
+}

Sky.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <d3d11.h>
+#include <wrl/client.h>
+#include <memory>
+#include "Mesh.h"
+#include "SimpleShader.h"
+#include "Camera.h"
+
+class Sky
+{
+public:
+	Sky(
+		std::shared_ptr<Mesh>											_mesh,
+		Microsoft::WRL::ComPtr<ID3D11ShaderResourceView>				_cubemap,
+		Microsoft::WRL::ComPtr<ID3D11SamplerState>						_sampler,
+		Microsoft::WRL::ComPtr<ID3D11Device>							_device);
+	~Sky();
+
+	void			Draw(
+						Microsoft::WRL::ComPtr<ID3D11DeviceContext>		_context,
+						Camera*											_camera);
+
+private:
+	Microsoft::WRL::ComPtr<ID3D11SamplerState>				sampler;
+	Microsoft::WRL::ComPtr<ID3D11DepthStencilState>			depthState;
+	Microsoft::WRL::ComPtr<ID3D11RasterizerState>			rasterizerState;
+	Microsoft::WRL::ComPtr<ID3D11ShaderResourceView>		cubemap;
+	std::shared_ptr<Mesh>									mesh;
+	std::shared_ptr<SimpleVertexShader>						vertexShader;
+	std::shared_ptr<SimplePixelShader>						pixelShader;
+};