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 <danylo.piliaiev@globallogic.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/intel/vulkan/anv_blorp.c b/src/intel/vulkan/anv_blorp.c
index 67e8d5abb04..827f224c278 100644
--- a/src/intel/vulkan/anv_blorp.c
+++ b/src/intel/vulkan/anv_blorp.c
@@ -1144,8 +1144,12 @@ void anv_CmdClearAttachments(
     * trash our depth and stencil buffers.
     */
    struct blorp_batch batch;
-   blorp_batch_init(&cmd_buffer->device->blorp, &batch, cmd_buffer,
-                    BLORP_BATCH_NO_EMIT_DEPTH_STENCIL);
+   enum blorp_batch_flags flags = BLORP_BATCH_NO_EMIT_DEPTH_STENCIL;
+   if (cmd_buffer->state.conditional_render_enabled) {
+      anv_cmd_emit_conditional_render_predicate(cmd_buffer);
+      flags |= BLORP_BATCH_PREDICATE_ENABLE;
+   }
+   blorp_batch_init(&cmd_buffer->device->blorp, &batch, cmd_buffer, flags);
 
    for (uint32_t a = 0; a < attachmentCount; ++a) {
       if (pAttachments[a].aspectMask & VK_IMAGE_ASPECT_ANY_COLOR_BIT_ANV) {