Class EXTBlendOperationAdvanced
- java.lang.Object
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- org.lwjgl.vulkan.EXTBlendOperationAdvanced
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public final class EXTBlendOperationAdvanced extends java.lang.Object
This extension adds a number of "advanced
" blending operations that can be used to perform new color blending operations, many of which are more complex than the standard blend modes provided by unextended Vulkan. This extension requires different styles of usage, depending on the level of hardware support and the enabled features:- If
VkPhysicalDeviceBlendOperationAdvancedFeaturesEXT
::advancedBlendCoherentOperations
isFALSE
, the new blending operations are supported, but a memory dependency must separate each advanced blend operation on a given sample.ACCESS_COLOR_ATTACHMENT_READ_NONCOHERENT_BIT_EXT
is used to synchronize reads using advanced blend operations. - If
VkPhysicalDeviceBlendOperationAdvancedFeaturesEXT
::advancedBlendCoherentOperations
isTRUE
, advanced blend operations obey primitive order just like basic blend operations.
In unextended Vulkan, the set of blending operations is limited, and can be expressed very simply. The
BLEND_OP_MIN
andBLEND_OP_MAX
blend operations simply compute component-wise minimums or maximums of source and destination color components. TheBLEND_OP_ADD
,BLEND_OP_SUBTRACT
, andBLEND_OP_REVERSE_SUBTRACT
modes multiply the source and destination colors by source and destination factors and either add the two products together or subtract one from the other. This limited set of operations supports many common blending operations but precludes the use of more sophisticated transparency and blending operations commonly available in many dedicated imaging APIs.This extension provides a number of new "
advanced
" blending operations. Unlike traditional blending operations usingBLEND_OP_ADD
, these blending equations do not use source and destination factors specified byVkBlendFactor
. Instead, each blend operation specifies a complete equation based on the source and destination colors. These new blend operations are used for both RGB and alpha components; they must not be used to perform separate RGB and alpha blending (via different values of color and alphaVkBlendOp
).These blending operations are performed using premultiplied colors, where RGB colors can be considered premultiplied or non-premultiplied by alpha, according to the
srcPremultiplied
anddstPremultiplied
members ofVkPipelineColorBlendAdvancedStateCreateInfoEXT
. If a color is considered non-premultiplied, the (R,G,B) color components are multiplied by the alpha component prior to blending. For non-premultiplied color components in the range[0,1]
, the corresponding premultiplied color component would have values in the range[0 × A, 1 × A]
.Many of these advanced blending equations are formulated where the result of blending source and destination colors with partial coverage have three separate contributions: from the portions covered by both the source and the destination, from the portion covered only by the source, and from the portion covered only by the destination. The blend parameter
VkPipelineColorBlendAdvancedStateCreateInfoEXT
::blendOverlap
can be used to specify a correlation between source and destination pixel coverage. If set toBLEND_OVERLAP_CONJOINT_EXT
, the source and destination are considered to have maximal overlap, as would be the case if drawing two objects on top of each other. If set toBLEND_OVERLAP_DISJOINT_EXT
, the source and destination are considered to have minimal overlap, as would be the case when rendering a complex polygon tessellated into individual non-intersecting triangles. If set toBLEND_OVERLAP_UNCORRELATED_EXT
, the source and destination coverage are assumed to have no spatial correlation within the pixel.In addition to the coherency issues on implementations not supporting
advancedBlendCoherentOperations
, this extension has several limitations worth noting. First, the new blend operations have a limit on the number of color attachments they can be used with, as indicated byVkPhysicalDeviceBlendOperationAdvancedPropertiesEXT
::advancedBlendMaxColorAttachments
. Additionally, blending precision may be limited to 16-bit floating-point, which may result in a loss of precision and dynamic range for framebuffer formats with 32-bit floating-point components, and in a loss of precision for formats with 12- and 16-bit signed or unsigned normalized integer components.- Name String
VK_EXT_blend_operation_advanced
- Extension Type
- Device extension
- Registered Extension Number
- 149
- Revision
- 2
- Extension and Version Dependencies
- Requires Vulkan 1.0
- Contact
- Jeff Bolz jeffbolznv
- Last Modified Date
- 2017-06-12
- Contributors
- Jeff Bolz, NVIDIA
- If
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Field Summary
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Field Detail
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VK_EXT_BLEND_OPERATION_ADVANCED_SPEC_VERSION
The extension specification version.
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VK_EXT_BLEND_OPERATION_ADVANCED_EXTENSION_NAME
The extension name.
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VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_BLEND_OPERATION_ADVANCED_FEATURES_EXT, VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_BLEND_OPERATION_ADVANCED_PROPERTIES_EXT, VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_ADVANCED_STATE_CREATE_INFO_EXT
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VK_BLEND_OP_ZERO_EXT, VK_BLEND_OP_SRC_EXT, VK_BLEND_OP_DST_EXT, VK_BLEND_OP_SRC_OVER_EXT, VK_BLEND_OP_DST_OVER_EXT, VK_BLEND_OP_SRC_IN_EXT, VK_BLEND_OP_DST_IN_EXT, VK_BLEND_OP_SRC_OUT_EXT, VK_BLEND_OP_DST_OUT_EXT, VK_BLEND_OP_SRC_ATOP_EXT, VK_BLEND_OP_DST_ATOP_EXT, VK_BLEND_OP_XOR_EXT, VK_BLEND_OP_MULTIPLY_EXT, VK_BLEND_OP_SCREEN_EXT, VK_BLEND_OP_OVERLAY_EXT, VK_BLEND_OP_DARKEN_EXT, VK_BLEND_OP_LIGHTEN_EXT, VK_BLEND_OP_COLORDODGE_EXT, VK_BLEND_OP_COLORBURN_EXT, VK_BLEND_OP_HARDLIGHT_EXT, VK_BLEND_OP_SOFTLIGHT_EXT, VK_BLEND_OP_DIFFERENCE_EXT, VK_BLEND_OP_EXCLUSION_EXT, VK_BLEND_OP_INVERT_EXT, VK_BLEND_OP_INVERT_RGB_EXT, VK_BLEND_OP_LINEARDODGE_EXT, VK_BLEND_OP_LINEARBURN_EXT, VK_BLEND_OP_VIVIDLIGHT_EXT, VK_BLEND_OP_LINEARLIGHT_EXT, VK_BLEND_OP_PINLIGHT_EXT, VK_BLEND_OP_HARDMIX_EXT, VK_BLEND_OP_HSL_HUE_EXT, VK_BLEND_OP_HSL_SATURATION_EXT, VK_BLEND_OP_HSL_COLOR_EXT, VK_BLEND_OP_HSL_LUMINOSITY_EXT, VK_BLEND_OP_PLUS_EXT, VK_BLEND_OP_PLUS_CLAMPED_EXT, VK_BLEND_OP_PLUS_CLAMPED_ALPHA_EXT, VK_BLEND_OP_PLUS_DARKER_EXT, VK_BLEND_OP_MINUS_EXT, VK_BLEND_OP_MINUS_CLAMPED_EXT, VK_BLEND_OP_CONTRAST_EXT, VK_BLEND_OP_INVERT_OVG_EXT, VK_BLEND_OP_RED_EXT, VK_BLEND_OP_GREEN_EXT, VK_BLEND_OP_BLUE_EXT
ExtendsVkBlendOp
.Enum values:
BLEND_OP_ZERO_EXT
BLEND_OP_SRC_EXT
BLEND_OP_DST_EXT
BLEND_OP_SRC_OVER_EXT
BLEND_OP_DST_OVER_EXT
BLEND_OP_SRC_IN_EXT
BLEND_OP_DST_IN_EXT
BLEND_OP_SRC_OUT_EXT
BLEND_OP_DST_OUT_EXT
BLEND_OP_SRC_ATOP_EXT
BLEND_OP_DST_ATOP_EXT
BLEND_OP_XOR_EXT
BLEND_OP_MULTIPLY_EXT
BLEND_OP_SCREEN_EXT
BLEND_OP_OVERLAY_EXT
BLEND_OP_DARKEN_EXT
BLEND_OP_LIGHTEN_EXT
BLEND_OP_COLORDODGE_EXT
BLEND_OP_COLORBURN_EXT
BLEND_OP_HARDLIGHT_EXT
BLEND_OP_SOFTLIGHT_EXT
BLEND_OP_DIFFERENCE_EXT
BLEND_OP_EXCLUSION_EXT
BLEND_OP_INVERT_EXT
BLEND_OP_INVERT_RGB_EXT
BLEND_OP_LINEARDODGE_EXT
BLEND_OP_LINEARBURN_EXT
BLEND_OP_VIVIDLIGHT_EXT
BLEND_OP_LINEARLIGHT_EXT
BLEND_OP_PINLIGHT_EXT
BLEND_OP_HARDMIX_EXT
BLEND_OP_HSL_HUE_EXT
BLEND_OP_HSL_SATURATION_EXT
BLEND_OP_HSL_COLOR_EXT
BLEND_OP_HSL_LUMINOSITY_EXT
BLEND_OP_PLUS_EXT
BLEND_OP_PLUS_CLAMPED_EXT
BLEND_OP_PLUS_CLAMPED_ALPHA_EXT
BLEND_OP_PLUS_DARKER_EXT
BLEND_OP_MINUS_EXT
BLEND_OP_MINUS_CLAMPED_EXT
BLEND_OP_CONTRAST_EXT
BLEND_OP_INVERT_OVG_EXT
BLEND_OP_RED_EXT
BLEND_OP_GREEN_EXT
BLEND_OP_BLUE_EXT
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VK_ACCESS_COLOR_ATTACHMENT_READ_NONCOHERENT_BIT_EXT
ExtendsVkAccessFlagBits
.
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VK_BLEND_OVERLAP_UNCORRELATED_EXT, VK_BLEND_OVERLAP_DISJOINT_EXT, VK_BLEND_OVERLAP_CONJOINT_EXT
VkBlendOverlapEXT - Enumerant specifying the blend overlap parameterDescription
BLEND_OVERLAP_UNCORRELATED_EXT
specifies that there is no correlation between the source and destination coverage.BLEND_OVERLAP_CONJOINT_EXT
specifies that the source and destination coverage are considered to have maximal overlap.BLEND_OVERLAP_DISJOINT_EXT
specifies that the source and destination coverage are considered to have minimal overlap.
Advanced Blend Overlap Modes
Overlap Mode Weighting Equations BLEND_OVERLAP_UNCORRELATED_EXT
p0(As, Ad) = AsAd \\ p1(As, Ad) = As(1 − Ad) \\ p2(As, Ad) = Ad(1 − As) \\
BLEND_OVERLAP_CONJOINT_EXT
p0(As, Ad) = min(As, Ad) \\ p1(As, Ad) = max(As − Ad, 0) \\ p2(As, Ad) = max(Ad − As, 0) \\
BLEND_OVERLAP_DISJOINT_EXT
p0(As, Ad) = max(As + Ad − 1, 0) \\ p1(As, Ad) = min(As, 1 − Ad) \\ p2(As, Ad) = min(Ad, 1 − As) \\
See Also
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