GL_APICALL void GL_APIENTRY glBlendFunc(
GLenum sfactor,
GLenum dfactor
);
| Name | Description | |
|---|---|---|
| in | sfactor | Source blend factors for the blend feature |
| in | dfactor | Destination blend factors for the blend feature |
Configures the source and destination blend factors for the blend feature. The same values are set for the RGB and alpha components.
You can set sfactor and dfactor to the following values. (You cannot set dfactor to GL_SRC_ALPHA_SATURATE with POD.)
In the table, (Fr,Fg,Fb,Fa) indicates the blend factors for each RGBA component, (Rs,Gs,Bs,As) indicates the input pixel color, (Rd,Gd,Bd,Ad) indicates the pixel color stored in the framebuffer, and (Rc,Gc,Bc,Ac) indicates the constant color set by glBlendColor.
| GL_ZERO | (Fr,Fg,Fb,Fa) = (0,0,0,0) |
|---|---|
| GL_ONE | (Fr,Fg,Fb,Fa) = (1,1,1,1) |
| GL_SRC_COLOR | (Fr,Fg,Fb,Fa) = (Rs,Gs,Bs,As) |
| GL_ONE_MINUS_SRC_COLOR | (Fr,Fg,Fb,Fa) = (1,1,1,1) - (Rs,Gs,Bs,As) |
| GL_DST_COLOR | (Fr,Fg,Fb,Fa) = (Rd,Gd,Bd,Ad) |
| GL_ONE_MINUS_DST_COLOR | (Fr,Fg,Fb,Fa) = (1,1,1,1) - (Rd,Gd,Bd,Ad) |
| GL_SRC_ALPHA | (Fr,Fg,Fb,Fa) = (As,As,As,As) |
| GL_ONE_MINUS_SRC_ALPHA | (Fr,Fg,Fb,Fa) = (1,1,1,1) - (As,As,As,As) |
| GL_DST_ALPHA | (Fr,Fg,Fb,Fa) = (Ad,Ad,Ad,Ad) |
| GL_ONE_MINUS_DST_ALPHA | (Fr,Fg,Fb,Fa) = (1,1,1,1) - (Ad,Ad,Ad,Ad) |
| GL_CONSTANT_COLOR | (Fr,Fg,Fb,Fa) = (Rc,Gc,Bc,Ac) |
| GL_ONE_MINUS_CONSTANT_COLOR | (Fr,Fg,Fb,Fa) = (1,1,1,1) - (Rc,Gc,Bc,Ac) |
| GL_CONSTANT_ALPHA | (Fr,Fg,Fb,Fa) = (Ac,Ac,Ac,Ac) |
| GL_ONE_MINUS_CONSTANT_ALPHA | (Fr,Fg,Fb,Fa) = (1,1,1,1) - (Ac,Ac,Ac,Ac) |
| GL_SRC_ALPHA_SATURATE | (Fr,Fg,Fb,Fa) = (min(As,1-Ad),min(As,1-Ad),min(As,1-Ad),1) |
This function generates the following errors.
| GL_INVALID_OPERATION | This function was called without any command-list objects bound. |
|---|---|
| GL_INVALID_ENUM | The sfactor or dfactor argument was set to an invalid value. |
CONFIDENTIAL