anv: Implement VK_EXT_conditional_rendering for gen 7.5+

Conditional rendering affects next functions:
- vkCmdDraw, vkCmdDrawIndexed, vkCmdDrawIndirect, vkCmdDrawIndexedIndirect
- vkCmdDrawIndirectCountKHR, vkCmdDrawIndexedIndirectCountKHR
- vkCmdDispatch, vkCmdDispatchIndirect, vkCmdDispatchBase
- vkCmdClearAttachments

Value from conditional buffer is cached into designated register,
MI_PREDICATE is emitted every time conditional rendering is enabled
and command requires it.

v2: by Jason Ekstrand
  - Use vk_find_struct_const instead of manually looping
  - Move draw count loading to prepare function
  - Zero the top 32-bits of MI_ALU_REG15

v3: Apply pipeline flush before accessing conditional buffer
 (The issue was found by Samuel Iglesias)

v4: - Remove support of Haswell due to possible hardware bug
    - Made TMP_REG_PREDICATE and TMP_REG_DRAW_COUNT defines to
       define registers in one place.

v5: thanks to Jason Ekstrand and Lionel Landwerlin
    - Workaround the fact that MI_PREDICATE_RESULT is not
      accessible on Haswell by manually calculating
      MI_PREDICATE_RESULT and re-emitting MI_PREDICATE
      when necessary.

v6: suggested by Lionel Landwerlin
    - Instead of calculating the result of predicate once - re-emit
      MI_PREDICATE to make it easier to investigate error states.

v7: suggested by Jason
    - Make anv_pipe_invalidate_bits_for_access_flag add CS_STALL
      if VK_ACCESS_CONDITIONAL_RENDERING_READ_BIT is set.

v8: suggested by Lionel
    - Precompute conditional predicate's result to
      support secondary command buffers.
    - Make prepare_for_draw_count_predicate more readable.

Signed-off-by: Danylo Piliaiev <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c
index 45b1ca86859..9d8a982110b 100644
--- a/src/intel/vulkan/anv_device.c
+++ b/src/intel/vulkan/anv_device.c
@@ -916,6 +916,18 @@ void anv_GetPhysicalDeviceFeatures2(
          break;
       }
 
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_CONDITIONAL_RENDERING_FEATURES_EXT: {
+         VkPhysicalDeviceConditionalRenderingFeaturesEXT *features =
+            (VkPhysicalDeviceConditionalRenderingFeaturesEXT*)ext;
+         ANV_FROM_HANDLE(anv_physical_device, pdevice, physicalDevice);
+
+         features->conditionalRendering = pdevice->info.gen >= 8 ||
+                                          pdevice->info.is_haswell;
+         features->inheritedConditionalRendering = pdevice->info.gen >= 8 ||
+                                                   pdevice->info.is_haswell;
+         break;
+      }
+
       case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MULTIVIEW_FEATURES: {
          VkPhysicalDeviceMultiviewFeatures *features =
             (VkPhysicalDeviceMultiviewFeatures *)ext;