Thread: Shader hell

What shader version are you working with? Exactly how many inputs are you using? Can you post some function stubs, maybe something can be massaged or combined.

Outputs from VS.

Code:

struct VS_OUTPUT
{
	float4 Pos : POSITION;
	float3 Light : TEXCOORD0;
	float3 Norm : TEXCOORD1;
	float3 View : TEXCOORD2;
   	float4 Inscatter : COLOR0;
	float4 Extinction : COLOR1;
	float2 TerrainUV : TEXCOORD3;
	float2 DetailUV : TEXCOORD4;
};

Pos=interpolated vertex pos
Light=light direction
Norm=interpolated normal
View=view direction (camera position)
Inscatter=Mie and Rayleigh scattering (computed by vertex shader)
Extinction=Total amount of light being 'removed' by scattering
TerrainUV=texture coords for base texture
DetailUV=texture coords for detail texture (u*256.0f,v*256.0f)

I've used all the TEXCOORD slots I can according to ID3DErrorBuf which reports and error when I attempt to compile a shader using TEXCOORD5 and above.

Isn't there a way to combine shaders? This effect file is getting huge b/c I'm doing multiple scattering, specular phong, and supporting texture blending.

Are you GPU bound or CPU bound in your application? You might consider calculating the scatter (and extinction?) term on the cpu and then setting it in the effect file. Also if your detail uv's are just terrain uv's * 256.0f, that calculation can just be done in the pixel shader. You're using effect files right? Why don't you try putting what you can in global variables like light pos, light material props, maybe view direction.