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include: Document vkd3d-shader swizzles.

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Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Zebediah Figura 2020-09-03 22:41:48 -05:00 committed by Alexandre Julliard
parent 67065e4366
commit 277e70d035
1 changed files with 17 additions and 1 deletions
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18
include/vkd3d_shader.h
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@ -961,7 +961,7 @@ struct vkd3d_shader_signature
unsigned int element_count;
};
/* swizzle bits fields: wwzzyyxx */
/** Possible values for a single component of a vkd3d-shader swizzle. */
enum vkd3d_shader_swizzle_component
{
VKD3D_SHADER_SWIZZLE_X = 0x0,
@ -972,17 +972,33 @@ enum vkd3d_shader_swizzle_component
VKD3D_FORCE_32_BIT_ENUM(VKD3D_SHADER_SWIZZLE_COMPONENT),
};
/**
* A mask selecting one component from a vkd3d-shader swizzle. The component has
* type \ref vkd3d_shader_swizzle_component.
*/
#define VKD3D_SHADER_SWIZZLE_MASK (0xffu)
/** The offset, in bits, of the nth parameter of a vkd3d-shader swizzle. */
#define VKD3D_SHADER_SWIZZLE_SHIFT(idx) (8u * (idx))
/**
* A helper macro which returns a vkd3d-shader swizzle with the given
* components. The components are specified as the suffixes to members of
* \ref vkd3d_shader_swizzle_component. For example, the swizzle ".xwyy" can be
* represented as:
* \code
* VKD3D_SHADER_SWIZZLE(X, W, Y, Y)
* \endcode
*/
#define VKD3D_SHADER_SWIZZLE(x, y, z, w) \
vkd3d_shader_create_swizzle(VKD3D_SHADER_SWIZZLE_ ## x, \
VKD3D_SHADER_SWIZZLE_ ## y, \
VKD3D_SHADER_SWIZZLE_ ## z, \
VKD3D_SHADER_SWIZZLE_ ## w)
/** The identity swizzle ".xyzw". */
#define VKD3D_SHADER_NO_SWIZZLE VKD3D_SHADER_SWIZZLE(X, Y, Z, W)
/** Build a vkd3d-shader swizzle with the given components. */
static inline uint32_t vkd3d_shader_create_swizzle(enum vkd3d_shader_swizzle_component x,
enum vkd3d_shader_swizzle_component y, enum vkd3d_shader_swizzle_component z,
enum vkd3d_shader_swizzle_component w)