org.lwjgl.vulkan

Class KHRShaderDrawParameters

java.lang.Object

org.lwjgl.vulkan.KHRShaderDrawParameters

public final class KHRShaderDrawParameters
extends java.lang.Object

This extension adds support for the following SPIR-V extension in Vulkan:

• SPV_KHR_shader_draw_parameters

The extension provides access to three additional built-in shader variables in Vulkan:

• BaseInstance, which contains the firstInstance parameter passed to draw commands,
• BaseVertex, which contains the firstVertex or vertexOffset parameter passed to draw commands, and
• DrawIndex, which contains the index of the draw call currently being processed from an indirect draw call.

When using GLSL source-based shader languages, the following variables from GL_ARB_shader_draw_parameters can map to these SPIR-V built-in decorations:

• in int gl_BaseInstanceARB; → BaseInstance,
• in int gl_BaseVertexARB; → BaseVertex, and
• in int gl_DrawIDARB; → DrawIndex.

Promotion to Vulkan 1.1

All functionality in this extension is included in core Vulkan 1.1, however a feature bit was added to distinguish whether it is actually available or not.

Name String

VK_KHR_shader_draw_parameters

Extension Type

Device extension

Registered Extension Number

64

Revision

1

Extension and Version Dependencies

• Requires Vulkan 1.0

Deprecation state

• Promoted to Vulkan 1.1

Contact

• Daniel Koch dgkoch

Last Modified Date

2017-09-05

IP Status

No known IP claims.

Interactions and External Dependencies

• Requires the SPV_KHR_shader_draw_parameters SPIR-V extension.
• Requires GL_ARB_shader_draw_parameters for GLSL source languages.
• Promoted to Vulkan 1.1 Core

Contributors

• Daniel Koch, NVIDIA Corporation
• Jeff Bolz, NVIDIA
• Daniel Rakos, AMD
• Jan-Harald Fredriksen, ARM
• John Kessenich, Google
• Stuart Smith, IMG

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	VK_KHR_SHADER_DRAW_PARAMETERS_EXTENSION_NAME The extension name.
static int	VK_KHR_SHADER_DRAW_PARAMETERS_SPEC_VERSION The extension specification version.

Method Summary

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

VK_KHR_SHADER_DRAW_PARAMETERS_SPEC_VERSION

public static final int VK_KHR_SHADER_DRAW_PARAMETERS_SPEC_VERSION

The extension specification version.

See Also:

Constant Field Values

VK_KHR_SHADER_DRAW_PARAMETERS_EXTENSION_NAME

public static final java.lang.String VK_KHR_SHADER_DRAW_PARAMETERS_EXTENSION_NAME

The extension name.

See Also:

Constant Field Values