Hi
I wrote an EffectShader to manage backface lighting not available in DirectX9.
It works fine on all nVidia card, but not in most recently ATI cards. I don't get any error, but I cannot see any rendered triangle
What is wrong?
thanks for help
Sergio
/* Parameters */
float4x3 mWorld; // Inverted-Transposed World Matrix
float4x4 mWorldP; // Projected World Matrix
float3 CameraPos; // Camera Position
float4 Diffuse; // Material Ambient/Diffuse Color are same
float4 Specular; // Material Specular COlor
float Shiness; // Material Shiness
/* Constants */
const float3 LightDir = {0.0f, 0.5f, -.866f}; //Light Direction
const float4 LightColor = {0.7f, 0.7f, 0.7f, 1.0f}; //Light COlor (White)
const float4 LightDColor = {0.7f, 0.7f, 0.7f, 1.0f}; //Light Diffuse Color
const float4 LightSColor = {1.0f, 1.0f, 1.0f, 1.0f}; //Light Specular Color
const float4 AmbientColor = {0.3f, 0.3f, 0.3f, 1.0f}; //Global Ambient Color
/************* DATA STRUCTS **************/
struct DataIN {
float4 Position : POSITION;
float3 Normal : NORMAL;
};
struct DataOUT {
float4 Position : POSITION;
float4 AL : TEXCOORD0;
float4 DL : TEXCOORD1;
float4 SL : TEXCOORD2;
};
struct OUTPUT{
float4 color:COLOR;
};
/*********** vertex shader ******/
DataOUT MainVS(DataIN IN)
{
DataOUT OUT;
float3 N=normalize(mul(IN.Normal, mWorld));
float3 P0 = IN.Position;
float3 P = mul(P0, mWorldP);
float3 VH = normalize(normalize(CameraPos - P) + LightDir);
if (dot(N,LightDir) < 0) {
N = -N;
}
OUT.Position = mul(IN.Position, mWorldP);
OUT.AL = Diffuse * (AmbientColor + LightColor);
OUT.DL = Diffuse * LightDColor * dot(N, LightDir);
OUT.SL = Specular * LightSColor * pow(dot(N, VH), Shiness);
return OUT;
}
/********* pixel shader ********/
float4 MainPS(DataOUT IN) : COLOR
{
return float4 (IN.AL/1.7 + abs(IN.DL)/1.3 + abs(IN.SL)/2);
}
technique TAndLV {
pass p0 {
ZEnable = True;
SpecularEnable = True;
CullMode = None;
ShadeMode = Gouraud;
VertexShader = compile vs_2_0 MainVS();
PixelShader = compile ps_2_0 MainPS();
}
}
