anv: Remove default scissor and viewport concepts

Users should never provide a scissor or viewport count of 0 because
they are required to set such state in a graphics pipeline. This
behavior was previously only used in Meta, which actually just
disables those hardware operations at pipeline creation time.

Kristian noticed that the current assignment of viewport count
reduces the number of viewport uploads, so it is not removed.

Signed-off-by: Nanley Chery <nanley.g.chery@intel.com>
Reviewed-by: Kristian Høgsberg Kristensen <kristian.h.kristensen@intel.com>

src/intel/vulkan/anv_meta_clear.c

@@ -47,8 +47,8 @@ meta_clear_begin(struct anv_meta_saved_state *saved_state,
                  (1 << VK_DYNAMIC_STATE_STENCIL_REFERENCE) |
                  (1 << VK_DYNAMIC_STATE_STENCIL_WRITE_MASK));
 
+   /* Avoid uploading more viewport states than necessary */
    cmd_buffer->state.dynamic.viewport.count = 0;
-   cmd_buffer->state.dynamic.scissor.count = 0;
 }
 
 static void

src/intel/vulkan/anv_meta_resolve.c

@@ -42,9 +42,6 @@ meta_resolve_save(struct anv_meta_saved_state *saved_state,
                   struct anv_cmd_buffer *cmd_buffer)
 {
    anv_meta_save(saved_state, cmd_buffer, 0);
-
-   cmd_buffer->state.dynamic.viewport.count = 0;
-   cmd_buffer->state.dynamic.scissor.count = 0;
 }
 
 static void

src/intel/vulkan/gen7_cmd_buffer.c

@@ -133,10 +133,11 @@ clamp_int64(int64_t x, int64_t min, int64_t max)
 }
 
 #if GEN_GEN == 7 && !GEN_IS_HASWELL
-static void
-emit_scissor_state(struct anv_cmd_buffer *cmd_buffer,
-                   uint32_t count, const VkRect2D *scissors)
+void
+gen7_cmd_buffer_emit_scissor(struct anv_cmd_buffer *cmd_buffer)
 {
+   uint32_t count = cmd_buffer->state.dynamic.scissor.count;
+   const VkRect2D *scissors =  cmd_buffer->state.dynamic.scissor.scissors;
    struct anv_state scissor_state =
       anv_cmd_buffer_alloc_dynamic_state(cmd_buffer, count * 8, 32);
 
@@ -178,25 +179,6 @@ emit_scissor_state(struct anv_cmd_buffer *cmd_buffer,
    if (!cmd_buffer->device->info.has_llc)
       anv_state_clflush(scissor_state);
 }
-
-void
-gen7_cmd_buffer_emit_scissor(struct anv_cmd_buffer *cmd_buffer)
-{
-   if (cmd_buffer->state.dynamic.scissor.count > 0) {
-      emit_scissor_state(cmd_buffer, cmd_buffer->state.dynamic.scissor.count,
-                         cmd_buffer->state.dynamic.scissor.scissors);
-   } else {
-      /* Emit a default scissor based on the currently bound framebuffer */
-      emit_scissor_state(cmd_buffer, 1,
-                         &(VkRect2D) {
-                            .offset = { .x = 0, .y = 0, },
-                            .extent = {
-                               .width = cmd_buffer->state.framebuffer->width,
-                               .height = cmd_buffer->state.framebuffer->height,
-                            },
-                         });
-   }
-}
 #endif
 
 static const uint32_t vk_to_gen_index_type[] = {

src/intel/vulkan/gen8_cmd_buffer.c

@@ -33,10 +33,11 @@
 #include "genxml/genX_pack.h"
 
 #if GEN_GEN == 8
-static void
-emit_viewport_state(struct anv_cmd_buffer *cmd_buffer,
-                    uint32_t count, const VkViewport *viewports)
+void
+gen8_cmd_buffer_emit_viewport(struct anv_cmd_buffer *cmd_buffer)
 {
+   uint32_t count = cmd_buffer->state.dynamic.viewport.count;
+   const VkViewport *viewports = cmd_buffer->state.dynamic.viewport.viewports;
    struct anv_state sf_clip_state =
       anv_cmd_buffer_alloc_dynamic_state(cmd_buffer, count * 64, 64);
    struct anv_state cc_state =
@@ -86,26 +87,6 @@ emit_viewport_state(struct anv_cmd_buffer *cmd_buffer,
                   GENX(3DSTATE_VIEWPORT_STATE_POINTERS_SF_CLIP),
                   .SFClipViewportPointer = sf_clip_state.offset);
 }
-
-void
-gen8_cmd_buffer_emit_viewport(struct anv_cmd_buffer *cmd_buffer)
-{
-   if (cmd_buffer->state.dynamic.viewport.count > 0) {
-      emit_viewport_state(cmd_buffer, cmd_buffer->state.dynamic.viewport.count,
-                          cmd_buffer->state.dynamic.viewport.viewports);
-   } else {
-      /* If viewport count is 0, this is taken to mean "use the default" */
-      emit_viewport_state(cmd_buffer, 1,
-                          &(VkViewport) {
-                             .x = 0.0f,
-                             .y = 0.0f,
-                             .width = cmd_buffer->state.framebuffer->width,
-                             .height = cmd_buffer->state.framebuffer->height,
-                             .minDepth = 0.0f,
-                             .maxDepth = 1.0f,
-                          });
-   }
-}
 #endif
 
 #define emit_lri(batch, reg, imm)                       \