gallium/swr: add OpenSWR driver

OpenSWR is a new software rasterizer for x86 processors designed
for high performance and high scalablility on visualization workloads.

Acked-by: Roland Scheidegger <[email protected]>
Acked-by: Jose Fonseca <[email protected]>

1 files changed, 116 insertions, 0 deletions

diff --git a/src/gallium/drivers/swr/swr_scratch.cpp b/src/gallium/drivers/swr/swr_scratch.cpp
new file mode 100644
index 00000000000..e6c448cb9e7
--- /dev/null
+++ b/src/gallium/drivers/swr/swr_scratch.cpp
@@ -0,0 +1,116 @@
+/****************************************************************************
+ * Copyright (C) 2015 Intel Corporation.   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ ***************************************************************************/
+
+#include "util/u_memory.h"
+#include "swr_context.h"
+#include "swr_scratch.h"
+#include "api.h"
+
+
+void *
+swr_copy_to_scratch_space(struct swr_context *ctx,
+                          struct swr_scratch_space *space,
+                          const void *user_buffer,
+                          unsigned int size)
+{
+   void *ptr;
+   assert(space);
+   assert(user_buffer);
+   assert(size);
+
+   if (size >= 2048) { /* XXX TODO create KNOB_ for this */
+      /* Use per draw SwrAllocDrawContextMemory for larger copies */
+      ptr = SwrAllocDrawContextMemory(ctx->swrContext, size, 4);
+   } else {
+      /* Allocate enough so that MAX_DRAWS_IN_FLIGHT sets fit. */
+      unsigned int max_size_in_flight = size * KNOB_MAX_DRAWS_IN_FLIGHT;
+
+      /* Need to grow space */
+      if (max_size_in_flight > space->current_size) {
+         /* Must idle the pipeline, this is infrequent */
+         SwrWaitForIdle(ctx->swrContext);
+
+         space->current_size = max_size_in_flight;
+
+         if (space->base) {
+            align_free(space->base);
+            space->base = NULL;
+         }
+
+         if (!space->base) {
+            space->base = (BYTE *)align_malloc(space->current_size, 4);
+            space->head = (void *)space->base;
+         }
+      }
+
+      /* Wrap */
+      if (((BYTE *)space->head + size)
+          >= ((BYTE *)space->base + space->current_size)) {
+         /*
+          * TODO XXX: Should add a fence on wrap.  Assumption is that
+          * current_space >> size, and there are at least MAX_DRAWS_IN_FLIGHT
+          * draws in scratch.  So fence would always be met on wrap.  A fence
+          * would ensure that first frame in buffer is done before wrapping.
+          * If fence ever needs to be waited on, can increase buffer size.
+          * So far in testing, this hasn't been necessary.
+          */
+         space->head = space->base;
+      }
+
+      ptr = space->head;
+      space->head = (BYTE *)space->head + size;
+   }
+
+   /* Copy user_buffer to scratch */
+   memcpy(ptr, user_buffer, size);
+
+   return ptr;
+}
+
+
+void
+swr_init_scratch_buffers(struct swr_context *ctx)
+{
+   struct swr_scratch_buffers *scratch;
+
+   scratch = CALLOC_STRUCT(swr_scratch_buffers);
+   ctx->scratch = scratch;
+}
+
+void
+swr_destroy_scratch_buffers(struct swr_context *ctx)
+{
+   struct swr_scratch_buffers *scratch = ctx->scratch;
+
+   if (scratch) {
+      if (scratch->vs_constants.base)
+         align_free(scratch->vs_constants.base);
+      if (scratch->fs_constants.base)
+         align_free(scratch->fs_constants.base);
+      if (scratch->vertex_buffer.base)
+         align_free(scratch->vertex_buffer.base);
+      if (scratch->index_buffer.base)
+         align_free(scratch->index_buffer.base);
+      FREE(scratch);
+   }
+}