C++ shader, HLSL , how to send to the shader , the texture? "sampler2d"?

Question

im starting learning some Shader manipulation witg C++ and HLSL, im using D3DXCompileShaderFromFile to do some tests while am learning

i was able to compile and run some VertexShader and PixelShader, send some Attributes, like float, float2, float3, float4 , float4x4 , to set worldMatrix ,Color information ,etc, here is some example:

void CShader::SetVector4(char name[], Vect4f vect)
{
D3DXVECTOR4 v(vect.x,vect.y,vect.z,vect.w);
D3DXHANDLE h = m_pConstantTable->GetConstantByName(NULL, name);
m_pConstantTable->SetVector(m_pDevice, h, &v);
}

almost the same thing with SetMatrix and SetFloat, ex:

myShader->SetVector4("Diffuse",Vect4f(1.0f,0.0f,0.0f,1.0f) );

but i ran to a problem doing so Basic Light shader

how can i send a texture to my "pixelShader"? in my ps is declared as "sampler2d" type, so im not sure what to use to send this information

float4  Diffuse;
float4  Ambient;
sampler2D baseMap;


float4 Main(float3 L: TEXCOORD0, float3 N: TEXCOORD1,float2 texCoord: TEXCOORD2 ) : COLOR
{
  float facingRatio =  dot(L, N);
  float4 tex = tex2D( baseMap, texCoord );

  return tex * Diffuse * facingRatio + Ambient * tex;

}

Pete · Accepted Answer · 2011-11-15 13:50:05Z

3

Don't you just need to bind the texture as normal? Not familiar with the directx api as I normally use Ogre, but quick look up suggests SetTexture(sampler, texture) is the way to go, with sampler being the sampler register. You can explicitly say which register the texture uses in the shader if you want.

answered Nov 15, 2011 at 13:50

Pete

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Comments

Jose De Gouveia · Accepted Answer · 2014-02-04 12:15:49Z

0

Thanks Pete!, i took a quick look on SetTexture(sampler, texture) documentation like you said, and i was able to figure out what to do, i made this new setter

void CShader::SetTexture(char name[])
{
    IDirect3DBaseTexture9* texture = NULL;
    D3DXHANDLE h = m_pConstantTable->GetConstantByName(NULL, name);

    int tex_idx = m_pConstantTable->GetSamplerIndex(h);

    m_pDevice->SetTexture(tex_idx, texture);    
    m_pDevice->SetSamplerState(tex_idx, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
    m_pDevice->SetSamplerState(tex_idx, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
    m_pDevice->SetSamplerState(tex_idx, D3DSAMP_MIPFILTER, D3DTEXF_LINEAR);
}

ex:

myShader->SetTexture("baseMap");

and somehow, it works, im not quite sure why , because i send to the "SetTexture" property an empty "texture"

edited Feb 4, 2014 at 12:15

answered Nov 15, 2011 at 23:41

Jose De Gouveia

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1 Comment

Pete Over a year ago

Looks reasonable apart from the NULL texture. If it is actually getting the texture you want then you must be sending it to the GPU elsewhere and it is some sort of fluke.

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