DX学习笔记(旋转的立方体)

里面主要包含d3dUtility.cpp,d3dUtility.h,cube.cpp。

d3dUtility.cpp,d3dUtility.h与前面demo的是完全一致的，参考http://blog.csdn.net/zero_witty/article/details/51621908

这里主要是cube.cpp,

首先初始化VB,IB全局变量，保存立方体的顶点和索引数据，并初始化全局变量Width,Height,定义窗口的大小

IDirect3DDevice9* Device = 0;

const int Width = 640;
const int Height = 480;

IDirect3DVertexBuffer9* VB = 0;
IDirect3DIndexBuffer9* IB = 0;

接着定义顶点结构，和该结构的灵活顶点类型

struct Vertex{
	Vertex();
	Vertex(float x, float y, float z)
	{
		_x = x;
		_y = y;
		_z = z;
	}
	float _x, _y, _z;
	static const DWORD FVF;
};

const DWORD Vertex::FVF = D3DFVF_XYZ;

再接着便是框架函数Setup()。先创建顶点缓存，索引缓存，并进行填充。

Device->CreateVertexBuffer(8 * sizeof(Vertex), D3DUSAGE_WRITEONLY, Vertex::FVF, D3DPOOL_MANAGED, &VB, 0);

	Device->CreateIndexBuffer(36 * sizeof(WORD), D3DUSAGE_WRITEONLY, D3DFMT_INDEX16, D3DPOOL_MANAGED, &IB, 0);

	Vertex* vertices;
	VB->Lock(0, 0, (void**)&vertices, 0);

	vertices[0] = Vertex(-1.0f, -1.0f, -1.0f);
	vertices[1] = Vertex(-1.0f, 1.0f, -1.0f);
	vertices[2] = Vertex(1.0f, 1.0f, -1.0f);
	vertices[3] = Vertex(1.0f, -1.0f, -1.0f);
	vertices[4] = Vertex(-1.0f, -1.0f, 1.0f);
	vertices[5] = Vertex(-1.0f, 1.0f, 1.0f);
	vertices[6] = Vertex(1.0f, 1.0f, 1.0f);
	vertices[7] = Vertex(1.0f, -1.0f, 1.0f);

	VB->Unlock();

	WORD* indices = 0;
	IB->Lock(0, 0, (void**)&indices, 0);

	indices[0] = 0; indices[1] = 1; indices[2] = 2;
	indices[3] = 0; indices[4] = 2; indices[5] = 3;

	indices[6] = 4; indices[7] = 6; indices[8] = 5;
	indices[9] = 4; indices[10] = 7; indices[11] = 6;

	indices[12] = 4; indices[13] = 5; indices[14] = 1;
	indices[15] = 4; indices[16] = 1; indices[17] = 0;

	indices[18] = 3; indices[19] = 2; indices[20] = 6;
	indices[21] = 3; indices[22] = 6; indices[23] = 7;

	indices[24] = 1; indices[25] = 5; indices[26] = 6;
	indices[27] = 1; indices[28] = 6; indices[29] = 2;

	indices[30] = 4; indices[31] = 0; indices[32] = 3;
	indices[33] = 4; indices[34] = 3; indices[35] = 7;

	IB->Unlock();

将摄像机沿z轴负方向，进行移动，使得立方体能处在摄像机的视场内，接着实现投影转化。最后将填充模式设为线框模式，就大功告成了

        D3DXVECTOR3 position(0.0f, 0.0f, -5.0f);
	D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
	D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);

	D3DXMATRIX V;
	D3DXMatrixLookAtLH(&V, &position, &target, &up);

	Device->SetTransform(D3DTS_VIEW, &V);

	D3DXMATRIX proj;
	D3DXMatrixPerspectiveFovLH(
		&proj,
		D3DX_PI * 0.5f,
		(float)Width/(float)Height,
		1.0f,
		1000.0f);
	Device->SetTransform(D3DTS_PROJECTION, &proj);

	Device->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);

接着实现展示函数Display(),它具有两个功能 ①更新场景②绘制场景

程序通过每帧都使旋转角有一定的改变量，使得产生转动的视觉效果。

IDirect3DDevice9::DrawIndexPrimitive()函数的一些说明：http://www.cnblogs.com/GameCode/archive/2011/07/11/2103380.html

bool Display(float timeDelta)
{
	if (Device)
	{
		D3DXMATRIX Rx, Ry;

		D3DXMatrixRotationX(&Rx, 3.14f / 4.0f);

		static  float y = 0.0f;
		D3DXMatrixRotationY(&Ry, y);
		y += timeDelta;

		if (y >= 6.28f)
			y = 0.0f;

		D3DXMATRIX p = Rx*Ry;

		Device->SetTransform(D3DTS_WORLD, &p);

		Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0xffffffff, 1.0f, 0);

		Device->BeginScene();

		Device->SetStreamSource(0, VB, 0, sizeof(Vertex));
		Device->SetIndices(IB);
		Device->SetFVF(Vertex::FVF);

		Device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 8, 0, 12);
		/*
		
		 DrawIndexedPrimitive(
		 D3DPRIMITIVETYPE type,//图元类型
		 INT BaseVertexIndex,//起始顶点的索引
		 UINT MinVertexIndex，//最小顶点的索引
		 UINT NumVertices,//顶点数量
		 UINT StartIndex, //起始索引
		 UINT PrimitiveCount //图元数量
		 )
		*/
		Device->EndScene();
		Device->Present(0, 0, 0, 0);
	}
	return true;
}

最后，释放顶点缓存和索引缓存接口

void Cleanup()
{
	d3d::Release(VB);
	d3d::Release(IB);
}

cube.cpp(完整代码)

#include"d3dUtility.h"

IDirect3DDevice9* Device = 0;

const int Width = 640;
const int Height = 480;

IDirect3DVertexBuffer9* VB = 0;
IDirect3DIndexBuffer9* IB = 0;


struct Vertex{
	Vertex();
	Vertex(float x, float y, float z)
	{
		_x = x;
		_y = y;
		_z = z;
	}
	float _x, _y, _z;
	static const DWORD FVF;
};

const DWORD Vertex::FVF = D3DFVF_XYZ;

bool Setup()
{
	Device->CreateVertexBuffer(8 * sizeof(Vertex), D3DUSAGE_WRITEONLY, Vertex::FVF, D3DPOOL_MANAGED, &VB, 0);

	Device->CreateIndexBuffer(36 * sizeof(WORD), D3DUSAGE_WRITEONLY, D3DFMT_INDEX16, D3DPOOL_MANAGED, &IB, 0);

	Vertex* vertices;
	VB->Lock(0, 0, (void**)&vertices, 0);

	vertices[0] = Vertex(-1.0f, -1.0f, -1.0f);
	vertices[1] = Vertex(-1.0f, 1.0f, -1.0f);
	vertices[2] = Vertex(1.0f, 1.0f, -1.0f);
	vertices[3] = Vertex(1.0f, -1.0f, -1.0f);
	vertices[4] = Vertex(-1.0f, -1.0f, 1.0f);
	vertices[5] = Vertex(-1.0f, 1.0f, 1.0f);
	vertices[6] = Vertex(1.0f, 1.0f, 1.0f);
	vertices[7] = Vertex(1.0f, -1.0f, 1.0f);

	VB->Unlock();

	WORD* indices = 0;
	IB->Lock(0, 0, (void**)&indices, 0);

	indices[0] = 0; indices[1] = 1; indices[2] = 2;
	indices[3] = 0; indices[4] = 2; indices[5] = 3;

	indices[6] = 4; indices[7] = 6; indices[8] = 5;
	indices[9] = 4; indices[10] = 7; indices[11] = 6;

	indices[12] = 4; indices[13] = 5; indices[14] = 1;
	indices[15] = 4; indices[16] = 1; indices[17] = 0;

	indices[18] = 3; indices[19] = 2; indices[20] = 6;
	indices[21] = 3; indices[22] = 6; indices[23] = 7;

	indices[24] = 1; indices[25] = 5; indices[26] = 6;
	indices[27] = 1; indices[28] = 6; indices[29] = 2;

	indices[30] = 4; indices[31] = 0; indices[32] = 3;
	indices[33] = 4; indices[34] = 3; indices[35] = 7;

	IB->Unlock();

	D3DXVECTOR3 position(0.0f, 0.0f, -5.0f);
	D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
	D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);

	D3DXMATRIX V;
	D3DXMatrixLookAtLH(&V, &position, &target, &up);

	Device->SetTransform(D3DTS_VIEW, &V);

	D3DXMATRIX proj;
	D3DXMatrixPerspectiveFovLH(
		&proj,
		D3DX_PI * 0.5f,
		(float)Width/(float)Height,
		1.0f,
		1000.0f);
	Device->SetTransform(D3DTS_PROJECTION, &proj);

	Device->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);

	return true;

}

bool Display(float timeDelta)
{
	if (Device)
	{
		D3DXMATRIX Rx, Ry;

		D3DXMatrixRotationX(&Rx, 3.14f / 4.0f);

		static  float y = 0.0f;
		D3DXMatrixRotationY(&Ry, y);
		y += timeDelta;

		if (y >= 6.28f)
			y = 0.0f;

		D3DXMATRIX p = Rx*Ry;

		Device->SetTransform(D3DTS_WORLD, &p);

		Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0xffffffff, 1.0f, 0);

		Device->BeginScene();

		Device->SetStreamSource(0, VB, 0, sizeof(Vertex));
		Device->SetIndices(IB);
		Device->SetFVF(Vertex::FVF);

		Device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 8, 0, 12);
		/*
		http://www.cnblogs.com/GameCode/archive/2011/07/11/2103380.html
		 DrawIndexedPrimitive(
		 D3DPRIMITIVETYPE type,//图元类型
		 INT BaseVertexIndex,//起始顶点的索引
		 UINT MinVertexIndex，//最小顶点的索引
		 UINT NumVertices,//顶点数量
		 UINT StartIndex, //起始索引
		 UINT PrimitiveCount //图元数量
		 )
		*/
		Device->EndScene();
		Device->Present(0, 0, 0, 0);
	}
	return true;
}
void Cleanup()
{
	d3d::Release(VB);
	d3d::Release(IB);
}

LRESULT CALLBACK d3d::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch (msg)
	{
	case WM_DESTROY:
		::PostQuitMessage(0);
		break;
	case WM_KEYDOWN:
		if (wParam == VK_ESCAPE)
			::DestroyWindow(hwnd);
		break;
	}
	return ::DefWindowProc(hwnd, msg, wParam, lParam);
}

int WINAPI  WinMain(HINSTANCE hinstance, HINSTANCE prevInstance, PSTR cmdLine, int showCmd)
{
	if (!d3d::InitD3D(hinstance, Width, Height, true, D3DDEVTYPE_HAL, &Device))
	{
		::MessageBox(0, "InitD3D() - FAILED", 0, 0);
		return 0;
	}

	if (!Setup())
	{
		::MessageBox(0, "Setup() - FAILED", 0, 0);
		return 0;
	}

	d3d::EnterMsgLoop(Display);

	Cleanup();

	Device->Release();

	return 0;
}

demo图