Contact
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Jeff Bolz jeffbolznv
Other Extension Metadata
- Last Modified Date
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2019-05-09
- IP Status
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No known IP claims.
- Contributors
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Jeff Bolz, NVIDIA
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Allen Jensen, NVIDIA
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Faith Ekstrand, Intel
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Description
This extension adds some line rasterization features that are commonly used in CAD applications and supported in other APIs like OpenGL. Bresenham-style line rasterization is supported, smooth rectangular lines (coverage to alpha) are supported, and stippled lines are supported for all three line rasterization modes.
New Enum Constants
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VK_EXT_LINE_RASTERIZATION_EXTENSION_NAME -
VK_EXT_LINE_RASTERIZATION_SPEC_VERSION -
Extending VkDynamicState:
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VK_DYNAMIC_STATE_LINE_STIPPLE_EXT
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Extending VkStructureType:
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VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_LINE_RASTERIZATION_FEATURES_EXT -
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_LINE_RASTERIZATION_PROPERTIES_EXT -
VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_LINE_STATE_CREATE_INFO_EXT
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Issues
1) Do we need to support Bresenham-style and smooth lines with more than one rasterization sample? i.e. the equivalent of glDisable(GL_MULTISAMPLE) in OpenGL when the framebuffer has more than one sample?
RESOLVED: Yes. For simplicity, Bresenham line rasterization carries forward a few restrictions from OpenGL, such as not supporting per-sample shading, alpha to coverage, or alpha to one.
Document Notes
For more information, see the Vulkan Specification
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