Spotlight.cpp
//=============================================================================
// Spotlight.cpp by Frank Luna (C) 2005 All Rights Reserved.
//
// Demonstrates an animated spotlight.
//
// Controls: Use mouse to orbit and zoom; use the 'W' and 'S' keys to
// alter the height of the camera.
// Use 'G' and 'H' to decrease and increase the spotlight cone,
// respectively.
//=============================================================================
#include "d3dApp.h"
#include "DirectInput.h"
#include <crtdbg.h>
#include "GfxStats.h"
#include <list>
#include "Vertex.h"
class SpotlightDemo : public D3DApp
{
public:
SpotlightDemo(HINSTANCE hInstance, std::string winCaption, D3DDEVTYPE devType, DWORD requestedVP);
~SpotlightDemo();
bool checkDeviceCaps();
void onLostDevice();
void onResetDevice();
void updateScene(float dt);
void drawScene();
// Helper methods
void buildGeoBuffers();
void buildFX();
void buildViewMtx();
void buildProjMtx();
void drawGrid();
void drawCylinders();
void drawSpheres();
private:
GfxStats* mGfxStats;
DWORD mNumGridVertices;
DWORD mNumGridTriangles;
ID3DXMesh* mCylinder;
ID3DXMesh* mSphere;
IDirect3DVertexBuffer9* mVB;
IDirect3DIndexBuffer9* mIB;
ID3DXEffect* mFX;
D3DXHANDLE mhTech;
D3DXHANDLE mhWVP;
D3DXHANDLE mhWorldInvTrans;
D3DXHANDLE mhAmbientLight;
D3DXHANDLE mhDiffuseLight;
D3DXHANDLE mhSpecLight;
D3DXHANDLE mhLightPosW;
D3DXHANDLE mhLightDirW;
D3DXHANDLE mhAttenuation012;
D3DXHANDLE mhSpotPower;
D3DXHANDLE mhAmbientMtrl;
D3DXHANDLE mhDiffuseMtrl;
D3DXHANDLE mhSpecMtrl;
D3DXHANDLE mhSpecPower;
D3DXHANDLE mhEyePos;
D3DXHANDLE mhWorld;
D3DXCOLOR mAmbientLight;
D3DXCOLOR mDiffuseLight;
D3DXCOLOR mSpecLight;
D3DXVECTOR3 mAttenuation012;
float mSpotPower;
Mtrl mGridMtrl;
Mtrl mCylinderMtrl;
Mtrl mSphereMtrl;
float mCameraRotationY;
float mCameraRadius;
float mCameraHeight;
D3DXMATRIX mView;
D3DXMATRIX mProj;
};
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE prevInstance,
PSTR cmdLine, int showCmd)
{
// Enable run-time memory check for debug builds.
#if defined(DEBUG) | defined(_DEBUG)
_CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
#endif
SpotlightDemo app(hInstance, "Spotlight Demo", D3DDEVTYPE_HAL, D3DCREATE_HARDWARE_VERTEXPROCESSING);
gd3dApp = &app;
DirectInput di(DISCL_NONEXCLUSIVE|DISCL_FOREGROUND, DISCL_NONEXCLUSIVE|DISCL_FOREGROUND);
gDInput = &di;
return gd3dApp->run();
}
SpotlightDemo::SpotlightDemo(HINSTANCE hInstance, std::string winCaption, D3DDEVTYPE devType, DWORD requestedVP)
: D3DApp(hInstance, winCaption, devType, requestedVP)
{
if(!checkDeviceCaps())
{
MessageBox(0, "checkDeviceCaps() Failed", 0, 0);
PostQuitMessage(0);
}
mGfxStats = new GfxStats();
mCameraRadius = 50.0f;
mCameraRotationY = 1.2 * D3DX_PI;
mCameraHeight = 20.0f;
mAmbientLight = 0.4f*WHITE;
mDiffuseLight = WHITE;
mSpecLight = WHITE;
mAttenuation012 = D3DXVECTOR3(1.0f, 0.0f, 0.0f);
mSpotPower = 16.0f;
mGridMtrl = Mtrl(BLUE, BLUE, WHITE, 16.0f);
mCylinderMtrl = Mtrl(RED, RED, WHITE, 8.0f);
mSphereMtrl = Mtrl(GREEN, GREEN, WHITE, 8.0f);
HR(D3DXCreateCylinder(gd3dDevice, 1.0f, 1.0f, 6.0f, 20, 20, &mCylinder, 0));
HR(D3DXCreateSphere(gd3dDevice, 1.0f, 20, 20, &mSphere, 0));
buildGeoBuffers();
buildFX();
// If you look at the drawCylinders and drawSpheres functions, you see
// that we draw 14 cylinders and 14 spheres.
int numCylVerts = mCylinder->GetNumVertices() * 14;
int numSphereVerts = mSphere->GetNumVertices() * 14;
int numCylTris = mCylinder->GetNumFaces() * 14;
int numSphereTris = mSphere->GetNumFaces() * 14;
mGfxStats->addVertices(mNumGridVertices);
mGfxStats->addVertices(numCylVerts);
mGfxStats->addVertices(numSphereVerts);
mGfxStats->addTriangles(mNumGridTriangles);
mGfxStats->addTriangles(numCylTris);
mGfxStats->addTriangles(numSphereTris);
onResetDevice();
InitAllVertexDeclarations();
}
SpotlightDemo::~SpotlightDemo()
{
delete mGfxStats;
ReleaseCOM(mVB);
ReleaseCOM(mIB);
ReleaseCOM(mFX);
ReleaseCOM(mCylinder);
ReleaseCOM(mSphere);
DestroyAllVertexDeclarations();
}
bool SpotlightDemo::checkDeviceCaps()
{
D3DCAPS9 caps;
HR(gd3dDevice->GetDeviceCaps(&caps));
// Check for vertex shader version 2.0 support.
if( caps.VertexShaderVersion < D3DVS_VERSION(2, 0) )
return false;
// Check for pixel shader version 2.0 support.
if( caps.PixelShaderVersion < D3DPS_VERSION(2, 0) )
return false;
return true;
}
void SpotlightDemo::onLostDevice()
{
mGfxStats->onLostDevice();
HR(mFX->OnLostDevice());
}
void SpotlightDemo::onResetDevice()
{
mGfxStats->onResetDevice();
HR(mFX->OnResetDevice());
// The aspect ratio depends on the backbuffer dimensions, which can
// possibly change after a reset. So rebuild the projection matrix.
buildProjMtx();
}
void SpotlightDemo::updateScene(float dt)
{
mGfxStats->update(dt);
// Get snapshot of input devices.
gDInput->poll();
// Check input.
if( gDInput->keyDown(DIK_W) )
mCameraHeight += 25.0f * dt;
if( gDInput->keyDown(DIK_S) )
mCameraHeight -= 25.0f * dt;
// Divide to make mouse less sensitive.
mCameraRotationY += gDInput->mouseDX() / 100.0f;
mCameraRadius += gDInput->mouseDY() / 25.0f;
// If we rotate over 360 degrees, just roll back to 0
if( fabsf(mCameraRotationY) >= 2.0f * D3DX_PI )
mCameraRotationY = 0.0f;
// Don't let radius get too small.
if( mCameraRadius < 5.0f )
mCameraRadius = 5.0f;
// Control spotlight cone.
if( gDInput->keyDown(DIK_G) )
mSpotPower += 25.0f * dt;
if( gDInput->keyDown(DIK_H) )
mSpotPower -= 25.0f * dt;
// Clamp spot Power.
if( mSpotPower < 1.0f )
mSpotPower = 1.0f;
if( mSpotPower > 64.0f )
mSpotPower = 64.0f;
// The camera position/orientation relative to world space can
// change every frame based on input, so we need to rebuild the
// view matrix every frame with the latest changes.
buildViewMtx();
}
void SpotlightDemo::drawScene()
{
// Clear the backbuffer and depth buffer.
HR(gd3dDevice->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0xffffffff, 1.0f, 0));
HR(gd3dDevice->BeginScene());
// Setup the rendering FX
HR(mFX->SetValue(mhAmbientLight, &mAmbientLight, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhDiffuseLight, &mDiffuseLight, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhSpecLight, &mSpecLight, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhAttenuation012, &mAttenuation012, sizeof(D3DXVECTOR3)));
HR(mFX->SetFloat(mhSpotPower, mSpotPower));
// Begin passes.
UINT numPasses = 0;
HR(mFX->Begin(&numPasses, 0));
for(UINT i = 0; i < numPasses; ++i)
{
HR(mFX->BeginPass(i));
drawGrid();
drawCylinders();
drawSpheres();
HR(mFX->EndPass());
}
HR(mFX->End());
mGfxStats->display();
HR(gd3dDevice->EndScene());
// Present the backbuffer.
HR(gd3dDevice->Present(0, 0, 0, 0));
}
void SpotlightDemo::buildGeoBuffers()
{
std::vector<D3DXVECTOR3> verts;
std::vector<DWORD> indices;
GenTriGrid(100, 100, 1.0f, 1.0f,
D3DXVECTOR3(0.0f, 0.0f, 0.0f), verts, indices);
// Save vertex count and triangle count for DrawIndexedPrimitive arguments.
mNumGridVertices = 100*100;
mNumGridTriangles = 99*99*2;
// Obtain a pointer to a new vertex buffer.
HR(gd3dDevice->CreateVertexBuffer(mNumGridVertices * sizeof(VertexPN),
D3DUSAGE_WRITEONLY, 0, D3DPOOL_MANAGED, &mVB, 0));
// Now lock it to obtain a pointer to its internal data, and write the
// grid's vertex data.
VertexPN* v = 0;
HR(mVB->Lock(0, 0, (void**)&v, 0));
for(DWORD i = 0; i < mNumGridVertices; ++i)
{
v[i].pos = verts[i];
v[i].normal = D3DXVECTOR3(0.0f, 1.0f, 0.0f);
}
HR(mVB->Unlock());
// Obtain a pointer to a new index buffer.
HR(gd3dDevice->CreateIndexBuffer(mNumGridTriangles*3*sizeof(WORD), D3DUSAGE_WRITEONLY,
D3DFMT_INDEX16, D3DPOOL_MANAGED, &mIB, 0));
// Now lock it to obtain a pointer to its internal data, and write the
// grid's index data.
WORD* k = 0;
HR(mIB->Lock(0, 0, (void**)&k, 0));
for(DWORD i = 0; i < mNumGridTriangles*3; ++i)
k[i] = (WORD)indices[i];
HR(mIB->Unlock());
}
void SpotlightDemo::buildFX()
{
// Create the FX from a .fx file.
ID3DXBuffer* errors = 0;
HR(D3DXCreateEffectFromFile(gd3dDevice, "spotlight.fx",
0, 0, D3DXSHADER_DEBUG, 0, &mFX, &errors));
if( errors )
MessageBox(0, (char*)errors->GetBufferPointer(), 0, 0);
// Obtain handles.
mhTech = mFX->GetTechniqueByName("SpotlightTech");
mhWVP = mFX->GetParameterByName(0, "gWVP");
mhWorldInvTrans = mFX->GetParameterByName(0, "gWorldInvTrans");
mhEyePos = mFX->GetParameterByName(0, "gEyePosW");
mhWorld = mFX->GetParameterByName(0, "gWorld");
mhAmbientLight = mFX->GetParameterByName(0, "gAmbientLight");
mhDiffuseLight = mFX->GetParameterByName(0, "gDiffuseLight");
mhSpecLight = mFX->GetParameterByName(0, "gSpecLight");
mhLightPosW = mFX->GetParameterByName(0, "gLightPosW");
mhLightDirW = mFX->GetParameterByName(0, "gLightDirW");
mhAttenuation012 = mFX->GetParameterByName(0, "gAttenuation012");
mhAmbientMtrl = mFX->GetParameterByName(0, "gAmbientMtrl");
mhDiffuseMtrl = mFX->GetParameterByName(0, "gDiffuseMtrl");
mhSpecMtrl = mFX->GetParameterByName(0, "gSpecMtrl");
mhSpecPower = mFX->GetParameterByName(0, "gSpecPower");
mhSpotPower = mFX->GetParameterByName(0, "gSpotPower");
}
void SpotlightDemo::buildViewMtx()
{
float x = mCameraRadius * cosf(mCameraRotationY);
float z = mCameraRadius * sinf(mCameraRotationY);
D3DXVECTOR3 pos(x, mCameraHeight, z);
D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMatrixLookAtLH(&mView, &pos, &target, &up);
HR(mFX->SetValue(mhEyePos, &pos, sizeof(D3DXVECTOR3)));
// Spotlight position is the same as the camera position.
HR(mFX->SetValue(mhLightPosW, &pos, sizeof(D3DXVECTOR3)));
// Spotlight direction is the same as the camera forward direction.
D3DXVECTOR3 lightDir = target - pos;
D3DXVec3Normalize(&lightDir, &lightDir);
HR(mFX->SetValue(mhLightDirW, &lightDir, sizeof(D3DXVECTOR3)));
}
void SpotlightDemo::buildProjMtx()
{
float w = (float)md3dPP.BackBufferWidth;
float h = (float)md3dPP.BackBufferHeight;
D3DXMatrixPerspectiveFovLH(&mProj, D3DX_PI * 0.25f, w/h, 1.0f, 5000.0f);
}
void SpotlightDemo::drawGrid()
{
HR(gd3dDevice->SetStreamSource(0, mVB, 0, sizeof(VertexPN)));
HR(gd3dDevice->SetIndices(mIB));
HR(gd3dDevice->SetVertexDeclaration(VertexPN::Decl));
D3DXMATRIX W, WIT;
D3DXMatrixIdentity(&W);
D3DXMatrixInverse(&WIT, 0, &W);
D3DXMatrixTranspose(&WIT, &WIT);
HR(mFX->SetMatrix(mhWorld, &W));
HR(mFX->SetMatrix(mhWVP, &(W*mView*mProj)));
HR(mFX->SetMatrix(mhWorldInvTrans, &WIT));
HR(mFX->SetValue(mhAmbientMtrl, &mGridMtrl.ambient, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhDiffuseMtrl, &mGridMtrl.diffuse, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhSpecMtrl, &mGridMtrl.spec, sizeof(D3DXCOLOR)));
HR(mFX->SetFloat(mhSpecPower, mGridMtrl.specPower));
HR(mFX->CommitChanges());
HR(gd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, mNumGridVertices, 0, mNumGridTriangles));
}
void SpotlightDemo::drawCylinders()
{
D3DXMATRIX T, R, W, WIT;
D3DXMatrixRotationX(&R, D3DX_PI*0.5f);
HR(mFX->SetValue(mhAmbientMtrl, &mCylinderMtrl.ambient, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhDiffuseMtrl, &mCylinderMtrl.diffuse, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhSpecMtrl, &mCylinderMtrl.spec, sizeof(D3DXCOLOR)));
HR(mFX->SetFloat(mhSpecPower, mCylinderMtrl.specPower));
for(int z = -30; z <= 30; z+= 10)
{
D3DXMatrixTranslation(&T, -10.0f, 3.0f, (float)z);
W = R*T;
D3DXMatrixInverse(&WIT, 0, &W);
D3DXMatrixTranspose(&WIT, &WIT);
HR(mFX->SetMatrix(mhWVP, &(W*mView*mProj)));
HR(mFX->SetMatrix(mhWorld, &W));
HR(mFX->SetMatrix(mhWorldInvTrans, &WIT));
HR(mFX->CommitChanges());
HR(mCylinder->DrawSubset(0));
D3DXMatrixTranslation(&T, 10.0f, 3.0f, (float)z);
W = R*T;
D3DXMatrixInverse(&WIT, 0, &W);
D3DXMatrixTranspose(&WIT, &WIT);
HR(mFX->SetMatrix(mhWVP, &(W*mView*mProj)));
HR(mFX->SetMatrix(mhWorld, &W));
HR(mFX->SetMatrix(mhWorldInvTrans, &WIT));
HR(mFX->CommitChanges());
HR(mCylinder->DrawSubset(0));
}
}
void SpotlightDemo::drawSpheres()
{
D3DXMATRIX W, WIT;
HR(mFX->SetValue(mhAmbientMtrl, &mSphereMtrl.ambient, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhDiffuseMtrl, &mSphereMtrl.diffuse, sizeof(D3DXCOLOR)));
HR(mFX->SetValue(mhSpecMtrl, &mSphereMtrl.spec, sizeof(D3DXCOLOR)));
HR(mFX->SetFloat(mhSpecPower, mSphereMtrl.specPower));
for(int z = -30; z <= 30; z+= 10)
{
D3DXMatrixTranslation(&W, -10.0f, 7.5f, (float)z);
D3DXMatrixInverse(&WIT, 0, &W);
D3DXMatrixTranspose(&WIT, &WIT);
HR(mFX->SetMatrix(mhWVP, &(W*mView*mProj)));
HR(mFX->SetMatrix(mhWorld, &W));
HR(mFX->SetMatrix(mhWorldInvTrans, &WIT));
HR(mFX->CommitChanges());
HR(mSphere->DrawSubset(0));
D3DXMatrixTranslation(&W, 10.0f, 7.5f, (float)z);
D3DXMatrixInverse(&WIT, 0, &W);
D3DXMatrixTranspose(&WIT, &WIT);
HR(mFX->SetMatrix(mhWVP, &(W*mView*mProj)));
HR(mFX->SetMatrix(mhWorld, &W));
HR(mFX->SetMatrix(mhWorldInvTrans, &WIT));
HR(mFX->CommitChanges());
HR(mSphere->DrawSubset(0));
}
}
spotlight.fx
//=============================================================================
// spotlight.fx by Frank Luna (C) 2004 All Rights Reserved.
//
// Does ambient, diffuse, and specular lighting with a spotlight source.
//=============================================================================
uniform extern float4x4 gWorld;
uniform extern float4x4 gWorldInvTrans;
uniform extern float4x4 gWVP;
uniform extern float3 gEyePosW;
uniform extern float4 gAmbientMtrl;
uniform extern float4 gDiffuseMtrl;
uniform extern float4 gSpecMtrl;
uniform extern float gSpecPower;
uniform extern float4 gAmbientLight;
uniform extern float4 gDiffuseLight;
uniform extern float4 gSpecLight;
uniform extern float3 gLightPosW;
uniform extern float3 gLightDirW;
uniform extern float3 gAttenuation012;
uniform extern float gSpotPower;
struct OutputVS
{
float4 posH : POSITION0;
float4 color : COLOR0;
};
OutputVS SpotlightVS(float3 posL : POSITION0, float3 normalL : NORMAL0)
{
// Zero out our output.
OutputVS outVS = (OutputVS)0;
// Transform normal to world space.
float3 normalW = mul(float4(normalL, 0.0f), gWorldInvTrans).xyz;
normalW = normalize(normalW);
// Transform vertex position to world space.
float3 posW = mul(float4(posL, 1.0f), gWorld).xyz;
// Unit vector from vertex to light source.
float3 lightVecW = normalize(gLightPosW - posW);
// Ambient Light Computation.
float3 ambient = (gAmbientMtrl*gAmbientLight).rgb;
// Diffuse Light Computation.
float s = max(dot(normalW, lightVecW), 0.0f);
float3 diffuse = s*(gDiffuseMtrl*gDiffuseLight).rgb;
// Specular Light Computation.
float3 toEyeW = normalize(gEyePosW - posW);
float3 reflectW = reflect(-lightVecW, normalW);
float t = pow(max(dot(reflectW, toEyeW), 0.0f), gSpecPower);
float3 spec = t*(gSpecMtrl*gSpecLight).rgb;
// Attentuation.
float d = distance(gLightPosW, posW);
float A = gAttenuation012.x + gAttenuation012.y*d + gAttenuation012.z*d*d;
// Spotlight factor.
float spot = pow(max(dot(-lightVecW, gLightDirW), 0.0f), gSpotPower);
// Everything together.
float3 color = spot*(ambient + ((diffuse + spec) / A));
// Pass on color and diffuse material alpha.
outVS.color = float4(color, gDiffuseMtrl.a);
// Transform to homogeneous clip space.
outVS.posH = mul(float4(posL, 1.0f), gWVP);
// Done--return the output.
return outVS;
}
float4 SpotlightPS(float4 c : COLOR0) : COLOR
{
return c;
}
technique SpotlightTech
{
pass P0
{
// Specify the vertex and pixel shader associated with this pass.
vertexShader = compile vs_2_0 SpotlightVS();
pixelShader = compile ps_2_0 SpotlightPS();
}
}
