sge

Compares the two sources to see if either is greater than the other. Sets the destination to 1.0 if the first source operand is greater than or equal to the second source operand; otherwise, the destination is set to 0.0.

sge dest, src0, src1

Registers

dest

Destination register.

src0

Input source register.

src1

Input source register.

To learn more about registers, see Registers.

Remarks

The following code fragment shows the operations performed by the sge instruction.

 
dest.x = (src0.x >= src1.x) ? 1.0f : 0.0f;
dest.y = (src0.y >= src1.y) ? 1.0f : 0.0f;
dest.z = (src0.z >= src1.z) ? 1.0f : 0.0f;
dest.w = (src0.w >= src1.w) ? 1.0f : 0.0f;

Example

// This example compares the component color values between two sources.

vs.1.0
m4x4 oPos, v0, c0	; transform vertices by view/projection matrix

mov r0, c4  		; load pink
sge r1, c5, r0		; compare gray to pink, component to component 
mov oD0, r1	    	; output result

// The resultant vertex color is cyan (0,1,1) and is shown below. 
// The red component is 0 because src0.x < src1.x. The green component 
// is 1 because src0.y > src1.y and the blue component is 1 because 
// src0.z > src1.z.

// Additional code is used to initialize the constant registers.

D3DXMATRIX mat, matView, matProj;
D3DXMatrixMultiply(&mat, &matView, &matProj);
D3DXMatrixTranspose(&mat, &mat);
// set C0 with the view and projection matrix
m_pd3dDevice->SetVertexShaderConstant(0, &mat, 4);

// set register C4
float colorPink[] = {0.75, 0, 0, 0};
m_pd3dDevice->SetVertexShaderConstant(4, &colorPink, 1);

// set register C5
float colorGray[] = {0.5f, 0.5f, 0.5f, 0.5f};
m_pd3dDevice->SetVertexShaderConstant(5, &colorGray, 1);

// The first SetVertexShaderConstant method binds the C0 register with 
// the first row of the view/projection matrix (rows 2, 3 and 4 are bound to 
// registers C2, C3 and c4 also). The m4x4 instruction (in the shader file) 
// loads the data.
// The second SetVertexShaderConstant method binds the C4 register with 
// data for the color pink. The last SetVertexShaderConstant method binds 
// the C5 register with data for the color gray.