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How to properly implement Shader Model 3.0


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#1 Knight52   Members   -  Reputation: 171

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Posted 19 April 2012 - 09:20 AM

I'm new to using effect file and therefore shader model too. I followed a tutorial that used SM 1.1 which I believe it's deprecated but it's the easiest to understand as far as I can find. this one.

Here's the fx file:
float4x4 xViewProjection;

struct VS_OUTPUT
{
	float4 Pos	: POSITION;
	float4 Color : COLOR0;
float4 Position3D : TEXCOORD0;
};
struct PS_OUTPUT
{
float4 Color : COLOR0;
};

VS_OUTPUT VS(float4 inPos : POSITION)
{
	VS_OUTPUT output = (VS_OUTPUT)0;
output.Pos = mul(inPos, xViewProjection);
output.Color.rgb = 0.6f;
output.Position3D = inPos;
	return output;
}
PS_OUTPUT PS(VS_OUTPUT ps_in) : COLOR
{
PS_OUTPUT output = (PS_OUTPUT)0;
output.Color = ps_in.Color;
return output;
}
technique BasicShader
{
	pass P0
	{
  VertexShader = compile vs_3_0 VS();
  PixelShader  = compile ps_3_0 PS();
	}
}

This is before I implement effect file http://i579.photobuc...21-46-25-98.jpg

Here's the result of implementing only pixel shader http://i579.photobucket.com/albums/ss231/hhygyulg/DXModelTest2012-04-1921-47-52-68.jpg
of implementing only vertex shader http://i579.photobuc...21-46-09-91.jpg
of implementing both shaders http://i579.photobuc...21-46-41-02.jpg

Where should I change? And if anyone knows tutorial on how to properly implement this with SM 3.0 would be great.

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#2 jischneider   Members   -  Reputation: 252

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Posted 19 April 2012 - 09:31 AM

I recommend the “Shaders For game programmers and artists” book. It is a little old, but still very good for learning shaders.

VS_OUTPUT VS(float4 inPos : POSITION)
{
	VS_OUTPUT output = (VS_OUTPUT)0;
	output.Pos = mul(inPos, worldViewProjection); // The world matrix rotate, scale and translate your object
    // You also need the normal.
   output.Normal = mul(in.Normal, worldIT); // The inverse transpose of the world matrix
   // And maybe texture coordinates.
   output.uv = in.uv;
   // Sometimes some light information
   ...
   return output;
}

float4 PS(VS_OUTPUT ps_in) : COLOR
{
  // The illumination algorithm. I recommend Blinn Phong for your first try.
  ...
  return output;
}

Ps: This should be in the beginners section.

Project page: < XNA FINAL Engine >





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