// 使用Direct3D9來繪圖
void RenderFrameDX9(void)
{
LPDIRECT3DDEVICE9 device = GutGetGraphicsDeviceDX9();
Vector4 vPlane(0.0f, 0.0f, 1.0f, -g_mirror_z);
device->BeginScene();
// 消除畫面
device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER | D3DCLEAR_STENCIL, D3DCOLOR_RGBA(0, 0, 150, 255), 1.0f, 0);
// 畫出茶壼
RenderModelDX9(false, NULL);
// 畫出鏡面, 同時把stencil值設為1.
{
device->SetRenderState(D3DRS_STENCILENABLE, TRUE);
device->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_REPLACE);
device->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_ALWAYS);
device->SetRenderState(D3DRS_STENCILREF, 1);
Matrix4x4 identity_matrix = Matrix4x4::IdentityMatrix();
device->SetTransform(D3DTS_WORLD, (D3DMATRIX *) &identity_matrix);
sModelMaterial_DX9 material;
material.m_Material.Diffuse.r = material.m_Material.Diffuse.g = material.m_Material.Diffuse.b = material.m_Material.Diffuse.a = 0.0f;
material.Submit();
// 畫出鏡面
device->SetFVF(D3DFVF_XYZ);
device->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, g_Quad_v, sizeof(Vertex_V));
}
// 把鏡面范圍的ZBuffer清為1.0
{
// 設定stencil test條件, 只更新鏡面范圍的像素.
device->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_EQUAL);
device->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_KEEP);
device->SetRenderState(D3DRS_ZFUNC, D3DCMP_ALWAYS); // 關閉z test
device->SetRenderState(D3DRS_COLORWRITEENABLE, 0); // 關閉RGBA的輸出
// 經由修改viewport Z范圍的方法, 把3D物件的Z值輸出固定為1.
int w, h;
GutGetWindowSize(w, h);
D3DVIEWPORT9 viewport;
viewport.X = viewport.Y = 0;
viewport.Width = w; viewport.Height = h;
viewport.MinZ = 1.0f; viewport.MaxZ = 1.0f;
device->SetViewport(&viewport);
// 畫出鏡面
device->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, g_Quad_v, sizeof(Vertex_V));
// 把Z值范圍還原成0-1
viewport.MinZ = 0.0f; viewport.MaxZ = 1.0f;
device->SetViewport(&viewport);
// 還原zbuffer test的測試條件
device->SetRenderState(D3DRS_ZFUNC, D3DCMP_LESSEQUAL);
// 重新打開RGBA的輸出
device->SetRenderState(D3DRS_COLORWRITEENABLE,
D3DCOLORWRITEENABLE_RED |
D3DCOLORWRITEENABLE_GREEN |
D3DCOLORWRITEENABLE_BLUE |
D3DCOLORWRITEENABLE_ALPHA);
}
// 在鏡面范圍里畫出鏡射的茶壼
{
RenderModelDX9(true, &vPlane);
device->SetRenderState(D3DRS_STENCILENABLE, FALSE);
}
// 宣告所有的繪圖指令都下完了
device->EndScene();
// 把背景backbuffer的畫面呈現出來
device->Present( NULL, NULL, NULL, NULL );
}
// 使用DirectX 9來繪圖
void RenderFrameDX9(void)
{
LPDIRECT3DDEVICE9 device = GutGetGraphicsDeviceDX9();
Vector4 vPlane(0.0f, 0.0f, 1.0f, -g_mirror_z);
// 開始下繪圖指令
device->BeginScene();
{
LPDIRECT3DSURFACE9 pFrameBufferBackup, pDepthBufferBackup;
device->GetRenderTarget(0, &pFrameBufferBackup); pFrameBufferBackup->Release();
device->GetDepthStencilSurface(&pDepthBufferBackup); pDepthBufferBackup->Release();
LPDIRECT3DSURFACE9 pSurface;
g_pTexture->GetSurfaceLevel(0, &pSurface);
device->SetRenderTarget(0, pSurface);
device->SetDepthStencilSurface(g_pDepthStencil);
device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_RGBA(0, 0, 200, 255), 1.0f, 0);
RenderModelDX9(true, &vPlane);
pSurface->Release();
device->SetRenderTarget(0, pFrameBufferBackup);
device->SetDepthStencilSurface(pDepthBufferBackup);
}
// 把上一個步驟的結果當成貼圖來使用
{
// 消除畫面
device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_RGBA(0, 0, 150, 255), 1.0f, 0);
RenderModelDX9(false, NULL);
Matrix4x4 identMat; identMat.Identity();
device->SetTransform(D3DTS_WORLD, (D3DMATRIX *) &identMat);
sModelMaterial_DX9 material;
material.m_pTextures[0] = g_pTexture;
material.Submit();
device->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
device->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
device->SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_NONE);
device->SetSamplerState(1, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
device->SetSamplerState(1, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
device->SetSamplerState(1, D3DSAMP_MIPFILTER, D3DTEXF_NONE);
Matrix4x4 uv_offset_matrix;
uv_offset_matrix.Scale_Replace(0.5f, -0.5f, 1.0f);
uv_offset_matrix[3].Set(0.5f, 0.5f, 0.5f, 1.0f);
Matrix4x4 inv_view_matrix = g_Control.GetViewMatrix();
inv_view_matrix.FastInvert();
Matrix4x4 texture_matrix = inv_view_matrix * g_mirror_view_matrix * g_projection_matrix * uv_offset_matrix;
device->SetTransform(D3DTS_TEXTURE0, (D3DMATRIX *) &texture_matrix);
device->SetTextureStageState(0, D3DTSS_TEXCOORDINDEX, D3DTSS_TCI_CAMERASPACEPOSITION);
// D3DTTFF_PROJECTED告知direct3d裝置texcoord需要除以w
device->SetTextureStageState(0, D3DTSS_TEXTURETRANSFORMFLAGS, D3DTTFF_COUNT4|D3DTTFF_PROJECTED);
float v[12];
for ( int i=0; i<4; i++ )
{
g_Quad[i].m_Position.StoreXYZ(&v[i*3]);
}
// 畫出矩形
device->SetFVF(D3DFVF_XYZ);
//device->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, g_Quad, sizeof(Vertex_V));
device->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, v, 12);
}
// 宣告所有的繪圖指令都下完了
device->EndScene();
// 把背景backbuffer的畫面呈現出來
device->Present( NULL, NULL, NULL, NULL );
}