Microsoft DirectX 8.1 (pixel shader versions 1.0, 1.1, 1.2, 1.3, 1.4)

add

Performs a component-wise add of two registers.

add dest, src0, src1

Registers

Argument	Description	Registers				Version
Argument	Description	v_n	c_n	t_n	r_n	Version
dest	Destination register				x	1.0
				x	x	1.1, 1.2, 1.3
					x	1.4
src0, src1	Source register	x	x	x	x	1.0, 1.1, 1.2, 1.3
			x		x	1.4 phase 1
		x	x		x	1.4 phase 2

To learn more about registers, see Registers.

Remarks

This instruction performs a component-wise addition of two registers as shown below.

dest.r = src0.r + src1.r
dest.g = src0.g + src1.g
dest.b = src0.b + src1.b
dest.a = src0.a + src1.a

Example

This example is for illustration only. The C code accompanying the shader has not been optimized for performance.

// This example adds the vertex color to the texture color.

// The shader is shown below.
ps.1.0          // Version instruction.
tex t0          // Declare texture. This example requires the DX Logo texture 
                // to be set on stage 0.
add r0, t0, t0  // r0 = t0 + t0. This doubles each color component.
                // The effect is to increase image brightness.

// The input texture is shown on the left. The rendered output from the 
// pixel shader is shown on the right. In this example, it is brighter 
// because the texture color values have been doubled.


// Additional code loads the texture in texture stage 0.
LPDIRECT3DDEVICE8   m_pd3dDevice;   // Init this device pointer in the application.
LPDIRECT3DTEXTURE8  m_pTexture0;    // Use this variable to hold a pointer to the texture.
TCHAR               strPath[512] = "textureFile.jpg";

// Use a helper function from the SDK to load the texture.
D3DUtil_CreateTexture( m_pd3dDevice, strPath, &m_pTexture0, D3DFMT_R5G6B5 );
m_pd3dDevice->SetTexture( 0, m_pTexture0 );