This function can be used to retrieve the current extended blend mode being used for drawing. The function returns a 2 element 1D array with the following elements in it:
The values of the array will be one of the following constants ("s" denotes a value taken from the source while a "d" denotes a value from the destination):
| Blend Mode Factor Constant | |
|---|---|
| Constant | 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) |
Note that you can change these values and pass the full array to the gpu_set_blendmode_ext() function as a single argument.
gpu_get_blendmode_ext();
Array (2 elements only; see above for constants)
var bm = gpu_get_blendmode_ext();
bm[0] = bm_src_alpha;
gpu_set_blendmode_ext(bm);
The above code gets the current extended blend mode, modifies the source, and then sets the extended blend mode again.