nvk: KHR_descriptor_update_template

Implements KHR_descriptor_update_template

For testing this I have filtered the binding-model.txt set like this:

grep 'with_template' binding-model.txt | grep -v 'secondary_cmd_buf\|storage_image[a-z_\.]*3d'\|ray_query\|ray_tracing

We do not support secondary command buffers or ray tracing. With storage_image and 3d we hit an assert in nvk_descriptor_set.c write_image_view_desc() in this block:

   if (descriptor_type != VK_DESCRIPTOR_TYPE_SAMPLER &&
       info && info->imageView != VK_NULL_HANDLE) {
      VK_FROM_HANDLE(nvk_image_view, view, info->imageView);
      if (descriptor_type == VK_DESCRIPTOR_TYPE_STORAGE_IMAGE) {
         assert(view->storage_desc_index > 0);
         assert(view->storage_desc_index < (1 << 20));

         /* The nv50 compiler currently does some whacky stuff with images.
          * For now, just assert that we never do storage on 3D images and
          * that our descriptor index is at most 11 bits.
          */
         assert(view->storage_desc_index < (1 << 11));
         assert(view->vk.image->image_type != VK_IMAGE_TYPE_3D);

         desc.image_index = view->storage_desc_index;
      } else {
         assert(view->sampled_desc_index > 0);
         assert(view->sampled_desc_index < (1 << 20));
         desc.image_index = view->sampled_desc_index;
      }
   }

With the remaining tests we get:

Test run totals:
  Passed:        5087/8180 (62.2%)
  Failed:        0/8180 (0.0%)
  Not supported: 3093/8180 (37.8%)
  Warnings:      0/8180 (0.0%)

The "Not supported" are of two different kinds:

• NotSupported (2 is not supported at vktBindingShaderAccessTests.cpp:784)
• NotSupported (8 is not supported at vktBindingShaderAccessTests.cpp:784)

2 and 8 come from this enum in vulkancts:

enum VkShaderStageFlagBits
{
	VK_SHADER_STAGE_VERTEX_BIT			= 0x00000001,
	VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT	= 0x00000002,
	VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT	= 0x00000004,
	VK_SHADER_STAGE_GEOMETRY_BIT			= 0x00000008,
	VK_SHADER_STAGE_FRAGMENT_BIT			= 0x00000010,
	VK_SHADER_STAGE_COMPUTE_BIT			= 0x00000020,
	VK_SHADER_STAGE_ALL_GRAPHICS			= 0x0000001F,
	VK_SHADER_STAGE_ALL				= 0x7FFFFFFF,
	VK_SHADER_STAGE_FLAG_BITS_MAX_ENUM		= 0x7FFFFFFF,
};

We do not have support in nvk features for geometryShader and tessellationShader so that makes sense.