C Specification
The source and destination color and alpha blending factors are selected from the enum:
// Provided by VK_VERSION_1_0
typedef enum VkBlendFactor {
VK_BLEND_FACTOR_ZERO = 0,
VK_BLEND_FACTOR_ONE = 1,
VK_BLEND_FACTOR_SRC_COLOR = 2,
VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR = 3,
VK_BLEND_FACTOR_DST_COLOR = 4,
VK_BLEND_FACTOR_ONE_MINUS_DST_COLOR = 5,
VK_BLEND_FACTOR_SRC_ALPHA = 6,
VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA = 7,
VK_BLEND_FACTOR_DST_ALPHA = 8,
VK_BLEND_FACTOR_ONE_MINUS_DST_ALPHA = 9,
VK_BLEND_FACTOR_CONSTANT_COLOR = 10,
VK_BLEND_FACTOR_ONE_MINUS_CONSTANT_COLOR = 11,
VK_BLEND_FACTOR_CONSTANT_ALPHA = 12,
VK_BLEND_FACTOR_ONE_MINUS_CONSTANT_ALPHA = 13,
VK_BLEND_FACTOR_SRC_ALPHA_SATURATE = 14,
VK_BLEND_FACTOR_SRC1_COLOR = 15,
VK_BLEND_FACTOR_ONE_MINUS_SRC1_COLOR = 16,
VK_BLEND_FACTOR_SRC1_ALPHA = 17,
VK_BLEND_FACTOR_ONE_MINUS_SRC1_ALPHA = 18,
} VkBlendFactor;
Description
The semantics of the enum values are described in the table below:
VkBlendFactor | RGB Blend Factors (Sr,Sg,Sb) or (Dr,Dg,Db) | Alpha Blend Factor (Sa or Da) |
---|---|---|
|
(0,0,0) |
0 |
|
(1,1,1) |
1 |
|
(Rs0,Gs0,Bs0) |
As0 |
|
(1-Rs0,1-Gs0,1-Bs0) |
1-As0 |
|
(Rd,Gd,Bd) |
Ad |
|
(1-Rd,1-Gd,1-Bd) |
1-Ad |
|
(As0,As0,As0) |
As0 |
|
(1-As0,1-As0,1-As0) |
1-As0 |
|
(Ad,Ad,Ad) |
Ad |
|
(1-Ad,1-Ad,1-Ad) |
1-Ad |
|
(Rc,Gc,Bc) |
Ac |
|
(1-Rc,1-Gc,1-Bc) |
1-Ac |
|
(Ac,Ac,Ac) |
Ac |
|
(1-Ac,1-Ac,1-Ac) |
1-Ac |
|
(f,f,f); f = min(As0,1-Ad) |
1 |
|
(Rs1,Gs1,Bs1) |
As1 |
|
(1-Rs1,1-Gs1,1-Bs1) |
1-As1 |
|
(As1,As1,As1) |
As1 |
|
(1-As1,1-As1,1-As1) |
1-As1 |
In this table, the following conventions are used:
-
Rs0,Gs0,Bs0 and As0 represent the first source color R, G, B, and A components, respectively, for the fragment output location corresponding to the color attachment being blended.
-
Rs1,Gs1,Bs1 and As1 represent the second source color R, G, B, and A components, respectively, used in dual source blending modes, for the fragment output location corresponding to the color attachment being blended.
-
Rd,Gd,Bd and Ad represent the R, G, B, and A components of the destination color. That is, the color currently in the corresponding color attachment for this fragment/sample.
-
Rc,Gc,Bc and Ac represent the blend constant R, G, B, and A components, respectively.
Document Notes
For more information, see the Vulkan Specification
This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.