VK_EXT_shader_tile_image

Other Extension Metadata

Last Modified Date

2023-03-23

IP Status

No known IP claims.

Interactions and External Dependencies

• This extension provides API support for GL_EXT_shader_tile_image

Contributors

• Sandeep Kakarlapudi, Arm
• Jan-Harald Fredriksen, Arm
• James Fitzpatrick, Imagination
• Andrew Garrard, Imagination
• Jeff Leger, Qualcomm
• Huilong Wang, Huawei
• Graeme Leese, Broadcom
• Hans-Kristian Arntzen, Valve
• Tobias Hector, AMD
• Jeff Bolz, NVIDIA
• Shahbaz Youssefi, Google

Description

This extension allows fragment shader invocations to read color, depth and stencil values at their pixel location in rasterization order. The functionality is only available when using dynamic render passes introduced by VK_KHR_dynamic_rendering. Example use cases are programmable blending and deferred shading.

See fragment shader tile image reads for more information.

New Structures

• Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
  • VkPhysicalDeviceShaderTileImageFeaturesEXT
• Extending VkPhysicalDeviceProperties2:
  • VkPhysicalDeviceShaderTileImagePropertiesEXT

New Enum Constants

• VK_EXT_SHADER_TILE_IMAGE_EXTENSION_NAME
• VK_EXT_SHADER_TILE_IMAGE_SPEC_VERSION
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_TILE_IMAGE_FEATURES_EXT
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_TILE_IMAGE_PROPERTIES_EXT

Issues

None.

Examples

Color read example.

layout( location = 0 /* aliased to color attachment 0 */ ) tileImageEXT highp attachmentEXT color0;
layout( location = 1 /* aliased to color attachment 1 */ ) tileImageEXT highp attachmentEXT color1;

layout( location = 0 ) out vec4 fragColor;

void main()
{
    vec4 value = colorAttachmentReadEXT(color0) + colorAttachmentReadEXT(color1);
    fragColor = value;
}

Depth & Stencil read example.

void main()
{
    // read sample 0: works for non-MSAA or MSAA targets
    highp float last_depth = depthAttachmentReadEXT();
    lowp uint last_stencil = stencilAttachmentReadEXT();

    //..
}

Version History

• Revision 1, 2023-03-23 (Sandeep Kakarlapudi)
  • Initial version