"Reprint" D3D depth test and alpha blending

Original:D3D depth test and alpha blending

1. Depth test a) depth buffer: A piece of memory buffer for depth information of each pixel point on the screen. D3D determines whether the current pixel is drawn by comparing the depth of the currently drawn pixel point and the depth of the point corresponding to the depth buffer. b) d3dpresent_parameters. Autodepthstencilformat = D3dfmt_d16 indicates that the depth value is opened by a 16-bit binary representation of the depth test: pdevice->setrenderstate (d3drs_zenable, TRUE); depth test function: D 3drs_zfunc: tr> TD valign= "Top" width= "192" >d3dcmp_always

d3dcmp_never
d3dcmp_less (Common)
d3dcmp_equal
d3dcmp_lessequal	is less than or equal to
d3dcmp_greater	greater than
d3dcmp_notequal	Not equal to
d3dcmp_greaterequal	greater than or equal to
always returns true

Update buffer: Keep the depth buffer intact or update pdevice->setrenderstate ( D3DRS_ZWRITEENABLE, TRUE ) with the depth value of the current pixel;2.        alpha mix a)           principle: Color = ( rgbsrc * ksrc) OP (rgbdst * kdst) The most common method: Color = (rgbsrc * alphasrc) + (rgbdst * (1–ALPHASRC)  b)          Application Enabled: Pdevice->setrenderstate (d3drs_alphablendenable, TRUE);

Blend mode factor	Description
D3dblend_zero	(0, 0, 0, 0)
D3dblend_one	(1, 1, 1, 1)
D3dblend_srccolor	(Rs, Gs, Bs, as)
D3dblend_invsrccolor	(1-rs, 1-gs, 1-bs, 1-as)
D3dblend_srcalpha	(as, as, as, as)
D3dblend_invsrcalpha	(1-as, 1-as, 1-as, 1-as)
D3dblend_destalpha	(AD, ad, ad, AD)
D3dblend_invdestalpha	(1-ad, 1-ad, 1-ad, 1-ad)
D3dblend_destcolor	(Rd, Gd, Bd, Ad)
D3dblend_invdestcolor	(1-rd, 1-GD, 1-BD, 1-ad)
D3dblend_srcalphasat	(F, F, f, 1); f = min (as, 1-ad)

Alpha Blending method

d3dblendop_add	source calculation results and color buffer calculation results are added
d3dblendop_subtract	source calculation result minus color buffer calculation result
d3dblendop_revsubtract	color buffer calculation results minus source calculation results
d3dblendop_min	min (source calculation result, color buffer calculation result
d3dblendop_max	max (source calculation result, color buffer Calculation result)

Example of settings for Color = (RGBSRC * alphasrc) + (RGBDST * (1–ALPHASRC)): Pdevice->setrenderstate (D3drs_srcblend, D3dblend_srcalph A);pD evice->setrenderstate (D3drs_destblend, D3dblend_invsrcalpha);pD evice->setrenderstate (D3DBLENDOP,       D3DBLENDOP_ADD);(default value, optional) 3. Alpha Test A) principle determines whether the current pixel is drawn based on the alpha test condition and does not need to manipulate the color buffer, so the speed is faster than alpha blending. b) Application enablement: Pdevice->setrenderstate (d3drs_a Lphatestenable, TRUE); The Alpha test function D3dcmp_func enumeration, which defaults to the D3dcmp_always reference value: Pdevice->setrenderstate (D3drs_alpharef, 0x00000081);

"Reprint" D3D depth test and alpha blending