求助！怎么在添加背景图片

string description = "Basic Vertex Lighting with a Texture";
//------------------------------------
float4x4 viewProjection : ViewProjection;
float4x4 world : WORLD;
texture diffuseTexture : Diffuse
<
string ResourceName = "default_color.dds";
>;
//------------------------------------
struct vertexInput {
float3 position: POSITION;
float2 texCoordDiffuse: TEXCOORD0;
float4 data: COLOR;
};
struct vertexOutput {
float4 hPosition: POSITION;
float2 texCoordDiffuse: TEXCOORD0;
float2 alpha: TEXCOORD1;
};
//------------------------------------
vertexOutput VS_TransformAndTexture(vertexInput IN)
{
vertexOutput OUT = (vertexOutput)0;
float4 Pos = float4(IN.position,1);
float2 Pos2 = Pos.xy;
Pos.x = Pos2.x * cos(IN.data.z) + Pos2.y * sin(IN.data.z);
Pos.y = Pos2.y * cos(IN.data.z)-Pos2.x * sin(IN.data.z);
Pos.x +=IN.data.x;
Pos.y +=IN.data.y;
Pos = mul(Pos,viewProjection);
OUT.hPosition = Pos;
OUT.texCoordDiffuse = IN.texCoordDiffuse;
OUT.alpha.x = IN.data.w;
return OUT;
}
//------------------------------------
sampler TextureSampler = sampler_state
{
texture = <diffuseTexture>;
AddressU = CLAMP;
AddressV = CLAMP;
AddressW = CLAMP;
MIPFILTER = LINEAR;
MINFILTER = LINEAR;
MAGFILTER = LINEAR;
};
//-----------------------------------
float4 PS_Textured( vertexOutput IN): COLOR
{
float4 diffuseTexture = tex2D( TextureSampler,IN.texCoordDiffuse);
//diffuseTexture.xyz = float3(0.93,0.92,0.91);
diffuseTexture.a = diffuseTexture.a*(IN.alpha.x);
return diffuseTexture;
}
//-----------------------------------
technique textured
{
pass p0
{
VertexShader = compile vs_3_0 VS_TransformAndTexture();
PixelShader = compile ps_3_0 PS_Textured();
}
}
texture g_MeshTexture_ck; // Color texture for mesh
texture g_MeshTexture_fg; // Color texture for mesh
texture g_MeshTexture_alpha; // Color texture for mesh
sampler MeshTextureSampler_ck =
sampler_state
{
Texture = <g_MeshTexture_ck>;
MipFilter = LINEAR;
MinFilter = LINEAR;
MagFilter = LINEAR;
AddressU = CLAMP;
AddressV = CLAMP;
AddressW = CLAMP;
};
sampler MeshTextureSampler_fg =
sampler_state
{
Texture = <g_MeshTexture_fg>;
MipFilter = LINEAR;
MinFilter = LINEAR;
MagFilter = LINEAR;
AddressU = CLAMP;
AddressV = CLAMP;
AddressW = CLAMP;
};
sampler MeshTextureSampler_alpha =
sampler_state
{
Texture = <g_MeshTexture_alpha>;
MipFilter = LINEAR;
MinFilter = LINEAR;
MagFilter = LINEAR;
AddressU = CLAMP;
AddressV = CLAMP;
AddressW = CLAMP;
};
struct VS_OUTPUT
{
float2 TextureUV : TEXCOORD0; // vertex texture coords
};
struct PS_OUTPUT
{
float4 RGBColor : COLOR0; // Pixel color
};
PS_OUTPUT RenderScenePS_Blend2( VS_OUTPUT In )
{
PS_OUTPUT outputPS;
float4 FG = tex2D(MeshTextureSampler_fg, In.TextureUV);
float4 BG = tex2D(MeshTextureSampler_ck, In.TextureUV);
float4 al = tex2D(MeshTextureSampler_alpha, In.TextureUV);
outputPS.RGBColor =FG*(1-al.r)+BG*al.r;
//outputPS.RGBColor = BG;
return outputPS;
}
technique RenderSceneBlend
{
pass P1
{
PixelShader = compile ps_3_0 RenderScenePS_Blend2();
}
}
float alpha;
PS_OUTPUT RenderScenePS_Alpha( VS_OUTPUT In )
{
PS_OUTPUT outputPS;
float4 al = tex2D(MeshTextureSampler_alpha, In.TextureUV);
al.r = al.r*alpha;
outputPS.RGBColor =al;
return outputPS;
}
technique RenderSceneAlpha
{
pass P1
{
PixelShader = compile ps_3_0 RenderScenePS_Alpha();
}
}