gpu_get_blendmode_srcalpha

描述

This function can be used to retrieve the current source extended blend mode alpha factor. The value returned will be one of the following constants ("s" denotes a value taken from the source while a "d" denotes a value from the destination) with only the "A" component being used when drawing:

常量	Blend factor (Red, Green, Blue, Alpha)
bm_zero	(0, 0, 0, 0)
bm_one	(1, 1, 1, 1)
bm_src_colour	(Rs, Gs, Bs, As)
bm_inv_src_colour	(1-Rs, 1-Gs, 1-Bs, 1-As)
bm_src_alpha	(As, As, As, As)
bm_inv_src_alpha	(1-As, 1-As, 1-As, 1-As)
bm_dest_alpha	(Ad, Ad, Ad, Ad)
bm_inv_dest_alpha	(1-Ad, 1-Ad, 1-Ad, 1-Ad)
bm_dest_colour	(Rd, Gd, Bd, Ad)
bm_inv_dest_colour	(1-Rd, 1-Gd, 1-Bd, 1-Ad)
bm_src_alpha_sat	(f, f, f, 1) where f = min(As, 1-Ad)

语法：

gpu_get_blendmode_srcalpha();

返回：

Constant (see above table)

例如：

var bm;
bm[0] = gpu_get_blendmode_srcalpha();
bm[1] = gpu_get_blendmode_destalpha();
gpu_set_blendmode_ext_sepalpha(bm_inv_src_alpha, bm_inv_dest_colour, bm[0], bm[1]);

The above code creates a local array and gets the current source and destination blending factors for the alpha component. This array is then used to manipulate the RGB component of the blending factors.

© Copyright YoYo Games Ltd. 2018 All Rights Reserved