pipebuffer: Ondemand buffer manager.

A variation of malloc buffers which get transferred to real graphics memory
when there is an attempt to validate them.

src/gallium/auxiliary/pipebuffer/Makefile

@@ -11,6 +11,7 @@ C_SOURCES = \
 	pb_bufmgr_debug.c \
 	pb_bufmgr_fenced.c \
 	pb_bufmgr_mm.c \
+	pb_bufmgr_ondemand.c \
 	pb_bufmgr_pool.c \
 	pb_bufmgr_slab.c \
 	pb_validate.c \

src/gallium/auxiliary/pipebuffer/SConscript

@@ -10,6 +10,7 @@ pipebuffer = env.ConvenienceLibrary(
 		'pb_bufmgr_debug.c',
 		'pb_bufmgr_fenced.c',
 		'pb_bufmgr_mm.c',
+		'pb_bufmgr_ondemand.c',
 		'pb_bufmgr_pool.c',
 		'pb_bufmgr_slab.c',
 		'pb_validate.c',

src/gallium/auxiliary/pipebuffer/pb_bufmgr.h

@@ -182,6 +182,20 @@ pb_alt_manager_create(struct pb_manager *provider1,
                       struct pb_manager *provider2);
 
 
+/** 
+ * Ondemand buffer manager.
+ * 
+ * Buffers are created in malloc'ed memory (fast and cached), and the constents
+ * is transfered to a buffer from the provider (typically in slow uncached 
+ * memory) when there is an attempt to validate the buffer.
+ * 
+ * Ideal for situations where one does not know before hand whether a given
+ * buffer will effectively be used by the hardware or not. 
+ */
+struct pb_manager *
+pb_ondemand_manager_create(struct pb_manager *provider); 
+
+
 /** 
  * Debug buffer manager to detect buffer under- and overflows.
  *

src/gallium/auxiliary/pipebuffer/pb_bufmgr_ondemand.c

@@ -0,0 +1,303 @@
+/**************************************************************************
+ *
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * A variation of malloc buffers which get transferred to real graphics memory
+ * when there is an attempt to validate them. 
+ * 
+ * @author Jose Fonseca <jrfonseca@tungstengraphics.com>
+ */
+
+
+#include "pipe/p_debug.h"
+#include "util/u_memory.h"
+#include "pb_buffer.h"
+#include "pb_bufmgr.h"
+
+
+struct pb_ondemand_manager;
+
+
+struct pb_ondemand_buffer 
+{
+   struct pb_buffer base;
+   
+   struct pb_ondemand_manager *mgr;
+   
+   /** Regular malloc'ed memory */
+   void *data;
+   unsigned mapcount;
+   
+   /** Real buffer */
+   struct pb_buffer *buffer;
+   size_t size;
+   struct pb_desc desc;
+};
+
+
+struct pb_ondemand_manager
+{
+   struct pb_manager base;
+   
+   struct pb_manager *provider;
+};
+
+
+extern const struct pb_vtbl pb_ondemand_buffer_vtbl;
+
+static INLINE struct pb_ondemand_buffer *
+pb_ondemand_buffer(struct pb_buffer *buf)
+{
+   assert(buf);
+   assert(buf->vtbl == &pb_ondemand_buffer_vtbl);
+   return (struct pb_ondemand_buffer *)buf;
+}
+
+static INLINE struct pb_ondemand_manager *
+pb_ondemand_manager(struct pb_manager *mgr)
+{
+   assert(mgr);
+   return (struct pb_ondemand_manager *)mgr;
+}
+
+
+static void
+pb_ondemand_buffer_destroy(struct pb_buffer *_buf)
+{
+   struct pb_ondemand_buffer *buf = pb_ondemand_buffer(_buf);
+   
+   pb_reference(&buf->buffer, NULL);
+   
+   align_free(buf->data);
+   
+   FREE(buf);
+}
+
+
+static void *
+pb_ondemand_buffer_map(struct pb_buffer *_buf, 
+                       unsigned flags)
+{
+   struct pb_ondemand_buffer *buf = pb_ondemand_buffer(_buf);
+
+   if(buf->buffer) {
+      assert(!buf->data);
+      return pb_map(buf->buffer, flags);
+   }
+   else {
+      assert(buf->data);
+      ++buf->mapcount;
+      return buf->data;
+   }
+}
+
+
+static void
+pb_ondemand_buffer_unmap(struct pb_buffer *_buf)
+{
+   struct pb_ondemand_buffer *buf = pb_ondemand_buffer(_buf);
+
+   if(buf->buffer) {
+      assert(!buf->data);
+      pb_unmap(buf->buffer);
+   }
+   else {
+      assert(buf->data);
+      assert(buf->mapcount);
+      if(buf->mapcount)
+         --buf->mapcount;
+   }
+}
+
+
+static enum pipe_error 
+pb_ondemand_buffer_instantiate(struct pb_ondemand_buffer *buf)
+{
+   if(!buf->buffer) {
+      struct pb_manager *provider = buf->mgr->provider;
+      uint8_t *map;
+      
+      assert(!buf->mapcount);
+      
+      buf->buffer = provider->create_buffer(provider, buf->size, &buf->desc);
+      if(!buf->buffer)
+         return PIPE_ERROR_OUT_OF_MEMORY;
+      
+      map = pb_map(buf->buffer, PIPE_BUFFER_USAGE_CPU_READ);
+      if(!map) {
+         pb_reference(&buf->buffer, NULL);
+         return PIPE_ERROR;
+      }
+      
+      memcpy(map, buf->data, buf->size);
+      
+      pb_unmap(buf->buffer);
+      
+      if(!buf->mapcount) {
+         FREE(buf->data);
+         buf->data = NULL;
+      }
+   }
+   
+   return PIPE_OK;
+}
+
+static enum pipe_error 
+pb_ondemand_buffer_validate(struct pb_buffer *_buf, 
+                            struct pb_validate *vl,
+                            unsigned flags)
+{
+   struct pb_ondemand_buffer *buf = pb_ondemand_buffer(_buf);
+   enum pipe_error ret; 
+
+   assert(!buf->mapcount);
+   if(buf->mapcount)
+      return PIPE_ERROR;
+
+   ret = pb_ondemand_buffer_instantiate(buf);
+   if(ret != PIPE_OK)
+      return ret;
+   
+   return pb_validate(buf->buffer, vl, flags);
+}
+
+
+static void
+pb_ondemand_buffer_fence(struct pb_buffer *_buf, 
+                         struct pipe_fence_handle *fence)
+{
+   struct pb_ondemand_buffer *buf = pb_ondemand_buffer(_buf);
+   
+   assert(buf->buffer);
+   if(!buf->buffer)
+      return;
+   
+   pb_fence(buf->buffer, fence);
+}
+
+
+static void
+pb_ondemand_buffer_get_base_buffer(struct pb_buffer *_buf,
+                                   struct pb_buffer **base_buf,
+                                   unsigned *offset)
+{
+   struct pb_ondemand_buffer *buf = pb_ondemand_buffer(_buf);
+
+   if(pb_ondemand_buffer_instantiate(buf) != PIPE_OK) {
+      assert(0);
+      *base_buf = &buf->base;
+      *offset = 0;
+      return;
+   }
+
+   pb_get_base_buffer(buf->buffer, base_buf, offset);
+}
+
+
+const struct pb_vtbl 
+pb_ondemand_buffer_vtbl = {
+      pb_ondemand_buffer_destroy,
+      pb_ondemand_buffer_map,
+      pb_ondemand_buffer_unmap,
+      pb_ondemand_buffer_validate,
+      pb_ondemand_buffer_fence,
+      pb_ondemand_buffer_get_base_buffer
+};
+
+
+static struct pb_buffer *
+pb_ondemand_manager_create_buffer(struct pb_manager *_mgr, 
+                                  size_t size,
+                                  const struct pb_desc *desc) 
+{
+   struct pb_ondemand_manager *mgr = pb_ondemand_manager(_mgr);
+   struct pb_ondemand_buffer *buf;
+   
+   buf = CALLOC_STRUCT(pb_ondemand_buffer);
+   if(!buf)
+      return NULL;
+
+   buf->base.base.refcount = 1;
+   buf->base.base.alignment = desc->alignment;
+   buf->base.base.usage = desc->usage;
+   buf->base.base.size = size;
+   buf->base.vtbl = &pb_ondemand_buffer_vtbl;
+   
+   buf->mgr = mgr;
+   
+   buf->data = align_malloc(size, desc->alignment < sizeof(void*) ? sizeof(void*) : desc->alignment);
+   if(!buf->data) {
+      FREE(buf);
+      return NULL;
+   }
+   
+   buf->size = size;
+   buf->desc = *desc;
+
+   return &buf->base;
+}
+
+
+static void
+pb_ondemand_manager_flush(struct pb_manager *_mgr) 
+{
+   struct pb_ondemand_manager *mgr = pb_ondemand_manager(_mgr);
+   
+   mgr->provider->flush(mgr->provider);
+}
+
+
+static void
+pb_ondemand_manager_destroy(struct pb_manager *_mgr) 
+{
+   struct pb_ondemand_manager *mgr = pb_ondemand_manager(_mgr);
+
+   FREE(mgr);
+}
+
+
+struct pb_manager *
+pb_ondemand_manager_create(struct pb_manager *provider) 
+{
+   struct pb_ondemand_manager *mgr;
+
+   if(!provider)
+      return NULL;
+   
+   mgr = CALLOC_STRUCT(pb_ondemand_manager);
+   if(!mgr)
+      return NULL;
+   
+   mgr->base.destroy = pb_ondemand_manager_destroy;
+   mgr->base.create_buffer = pb_ondemand_manager_create_buffer;
+   mgr->base.flush = pb_ondemand_manager_flush;
+   
+   mgr->provider = provider;
+
+   return &mgr->base;
+}