From 7f141de6d631a6e0c9cd778f6b3259d41a700bb4 Mon Sep 17 00:00:00 2001
From: Andrew Comminos <andrew@comminos.com>
Date: Fri, 23 Feb 2018 17:42:21 -0800
Subject: [PATCH 2/8] wined3d: Allocate global write-only persistent buffer
 heap at device initialization.

---
 dlls/wined3d/device.c          | 28 ++++++++++++++++++++++++++++
 dlls/wined3d/wined3d_private.h |  3 +++
 2 files changed, 31 insertions(+)

diff --git a/dlls/wined3d/device.c b/dlls/wined3d/device.c
index 58f4993abe..363dcb17f0 100644
--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -845,6 +845,29 @@ static void destroy_default_samplers(struct wined3d_device *device, struct wined
     device->null_sampler = NULL;
 }
 
+/* Context activation is done by the caller. */
+static void create_buffer_heap(struct wined3d_device *device, struct wined3d_context *context)
+{
+    // TODO(acomminos): check if ARB_buffer_storage is supported, first-
+    //                  possibly make wined3d_buffer_heap_create fail.
+    // TODO(acomminos): definitely don't take up all of vram. this is gonna get
+    //                  paged anyway, though.
+    const GLsizeiptr HBO_SIZE = device->adapter->vram_bytes / 4;
+
+    HRESULT hr;
+    if (FAILED(hr = wined3d_buffer_heap_create(context, HBO_SIZE, TRUE, &device->wo_buffer_heap)))
+    {
+        ERR("Failed to create write-only persistent buffer heap, hr %#x.\n", hr);
+    }
+}
+
+/* Context activation is done by the caller. */
+static void destroy_buffer_heap(struct wined3d_device *device, struct wined3d_context *context)
+{
+    if (device->wo_buffer_heap)
+        wined3d_buffer_heap_destroy(device->wo_buffer_heap, context);
+}
+
 static LONG fullscreen_style(LONG style)
 {
     /* Make sure the window is managed, otherwise we won't get keyboard input. */
@@ -1013,6 +1036,8 @@ static void wined3d_device_delete_opengl_contexts_cs(void *object)
     device->shader_backend->shader_free_private(device);
     destroy_dummy_textures(device, context);
     destroy_default_samplers(device, context);
+    destroy_buffer_heap(device, context);
+
     context_release(context);
 
     while (device->context_count)
@@ -1060,6 +1085,9 @@ static void wined3d_device_create_primary_opengl_context_cs(void *object)
     context = context_acquire(device, target, 0);
     create_dummy_textures(device, context);
     create_default_samplers(device, context);
+
+    create_buffer_heap(device, context);
+
     context_release(context);
 }
 
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 4d0555a76c..96bda81eb9 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -2966,6 +2966,9 @@ struct wined3d_device
     /* Context management */
     struct wined3d_context **contexts;
     UINT context_count;
+
+    /* Dynamic buffer heap */
+    struct wined3d_buffer_heap *wo_buffer_heap;
 };
 
 void device_clear_render_targets(struct wined3d_device *device, UINT rt_count, const struct wined3d_fb_state *fb,
-- 
2.16.2