sync code with last improvements from OpenBSD

xserver/glamor/glamor_prepare.c

@@ -0,0 +1,303 @@
+/*
+ * Copyright © 2014 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include "glamor_priv.h"
+#include "glamor_prepare.h"
+#include "glamor_transfer.h"
+
+/*
+ * Make a pixmap ready to draw with fb by
+ * creating a PBO large enough for the whole object
+ * and downloading all of the FBOs into it.
+ */
+
+static Bool
+glamor_prep_pixmap_box(PixmapPtr pixmap, glamor_access_t access, BoxPtr box)
+{
+    ScreenPtr                   screen = pixmap->drawable.pScreen;
+    glamor_screen_private       *glamor_priv = glamor_get_screen_private(screen);
+    glamor_pixmap_private       *priv = glamor_get_pixmap_private(pixmap);
+    int                         gl_access, gl_usage;
+    RegionRec                   region;
+
+    if (priv->type == GLAMOR_DRM_ONLY)
+        return FALSE;
+
+    if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(priv))
+        return TRUE;
+
+    glamor_make_current(glamor_priv);
+
+    RegionInit(&region, box, 1);
+
+    /* See if it's already mapped */
+    if (pixmap->devPrivate.ptr) {
+        /*
+         * Someone else has mapped this pixmap;
+         * we'll assume that it's directly mapped
+         * by a lower level driver
+         */
+        if (!priv->prepared)
+            return TRUE;
+
+        /* In X, multiple Drawables can be stored in the same Pixmap (such as
+         * each individual window in a non-composited screen pixmap, or the
+         * reparented window contents inside the window-manager-decorated window
+         * pixmap on a composited screen).
+         *
+         * As a result, when doing a series of mappings for a fallback, we may
+         * need to add more boxes to the set of data we've downloaded, as we go.
+         */
+        RegionSubtract(&region, &region, &priv->prepare_region);
+        if (!RegionNotEmpty(&region))
+            return TRUE;
+
+        if (access == GLAMOR_ACCESS_RW)
+            FatalError("attempt to remap buffer as writable");
+
+        if (priv->pbo) {
+            glBindBuffer(GL_PIXEL_PACK_BUFFER, priv->pbo);
+            glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
+            pixmap->devPrivate.ptr = NULL;
+        }
+    } else {
+        RegionInit(&priv->prepare_region, box, 1);
+
+        if (glamor_priv->has_rw_pbo) {
+            if (priv->pbo == 0)
+                glGenBuffers(1, &priv->pbo);
+
+            gl_usage = GL_STREAM_READ;
+
+            glamor_priv->suppress_gl_out_of_memory_logging = true;
+
+            glBindBuffer(GL_PIXEL_PACK_BUFFER, priv->pbo);
+            glBufferData(GL_PIXEL_PACK_BUFFER,
+                         pixmap->devKind * pixmap->drawable.height, NULL,
+                         gl_usage);
+
+            glamor_priv->suppress_gl_out_of_memory_logging = false;
+
+            if (glGetError() == GL_OUT_OF_MEMORY) {
+                if (!glamor_priv->logged_any_pbo_allocation_failure) {
+                    LogMessageVerb(X_WARNING, 0, "glamor: Failed to allocate %d "
+                                   "bytes PBO due to GL_OUT_OF_MEMORY.\n",
+                                   pixmap->devKind * pixmap->drawable.height);
+                    glamor_priv->logged_any_pbo_allocation_failure = true;
+                }
+                glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+                glDeleteBuffers(1, &priv->pbo);
+                priv->pbo = 0;
+            }
+        }
+
+        if (!priv->pbo) {
+            pixmap->devPrivate.ptr = xallocarray(pixmap->devKind,
+                                                 pixmap->drawable.height);
+            if (!pixmap->devPrivate.ptr)
+                return FALSE;
+        }
+        priv->map_access = access;
+    }
+
+    glamor_download_boxes(pixmap, RegionRects(&region), RegionNumRects(&region),
+                          0, 0, 0, 0, pixmap->devPrivate.ptr, pixmap->devKind);
+
+    RegionUninit(&region);
+
+    if (priv->pbo) {
+        if (priv->map_access == GLAMOR_ACCESS_RW)
+            gl_access = GL_READ_WRITE;
+        else
+            gl_access = GL_READ_ONLY;
+
+        pixmap->devPrivate.ptr = glMapBuffer(GL_PIXEL_PACK_BUFFER, gl_access);
+        glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+    }
+
+    priv->prepared = TRUE;
+    return TRUE;
+}
+
+/*
+ * When we're done with the drawable, unmap the PBO, reupload
+ * if we were writing to it and then unbind it to release the memory
+ */
+
+static void
+glamor_fini_pixmap(PixmapPtr pixmap)
+{
+    glamor_pixmap_private       *priv = glamor_get_pixmap_private(pixmap);
+
+    if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(priv))
+        return;
+
+    if (!priv->prepared)
+        return;
+
+    if (priv->pbo) {
+        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, priv->pbo);
+        glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
+        pixmap->devPrivate.ptr = NULL;
+    }
+
+    if (priv->map_access == GLAMOR_ACCESS_RW) {
+        glamor_upload_boxes(pixmap,
+                            RegionRects(&priv->prepare_region),
+                            RegionNumRects(&priv->prepare_region),
+                            0, 0, 0, 0, pixmap->devPrivate.ptr, pixmap->devKind);
+    }
+
+    RegionUninit(&priv->prepare_region);
+
+    if (priv->pbo) {
+        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
+        glDeleteBuffers(1, &priv->pbo);
+        priv->pbo = 0;
+    } else {
+        free(pixmap->devPrivate.ptr);
+        pixmap->devPrivate.ptr = NULL;
+    }
+
+    priv->prepared = FALSE;
+}
+
+Bool
+glamor_prepare_access(DrawablePtr drawable, glamor_access_t access)
+{
+    PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+    BoxRec box;
+    int off_x, off_y;
+
+    glamor_get_drawable_deltas(drawable, pixmap, &off_x, &off_y);
+
+    box.x1 = drawable->x + off_x;
+    box.x2 = box.x1 + drawable->width;
+    box.y1 = drawable->y + off_y;
+    box.y2 = box.y1 + drawable->height;
+    return glamor_prep_pixmap_box(pixmap, access, &box);
+}
+
+Bool
+glamor_prepare_access_box(DrawablePtr drawable, glamor_access_t access,
+                         int x, int y, int w, int h)
+{
+    PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+    BoxRec box;
+    int off_x, off_y;
+
+    glamor_get_drawable_deltas(drawable, pixmap, &off_x, &off_y);
+    box.x1 = drawable->x + x + off_x;
+    box.x2 = box.x1 + w;
+    box.y1 = drawable->y + y + off_y;
+    box.y2 = box.y1 + h;
+    return glamor_prep_pixmap_box(pixmap, access, &box);
+}
+
+void
+glamor_finish_access(DrawablePtr drawable)
+{
+    glamor_fini_pixmap(glamor_get_drawable_pixmap(drawable));
+}
+
+/*
+ * Make a picture ready to use with fb.
+ */
+
+Bool
+glamor_prepare_access_picture(PicturePtr picture, glamor_access_t access)
+{
+    if (!picture || !picture->pDrawable)
+        return TRUE;
+
+    return glamor_prepare_access(picture->pDrawable, access);
+}
+
+Bool
+glamor_prepare_access_picture_box(PicturePtr picture, glamor_access_t access,
+                        int x, int y, int w, int h)
+{
+    if (!picture || !picture->pDrawable)
+        return TRUE;
+
+    /* If a transform is set, we don't know what the bounds is on the
+     * source, so just prepare the whole pixmap.  XXX: We could
+     * potentially work out where in the source would be sampled based
+     * on the transform, and we don't need do do this for destination
+     * pixmaps at all.
+     */
+    if (picture->transform) {
+        return glamor_prepare_access_box(picture->pDrawable, access,
+                                         0, 0,
+                                         picture->pDrawable->width,
+                                         picture->pDrawable->height);
+    } else {
+        return glamor_prepare_access_box(picture->pDrawable, access,
+                                         x, y, w, h);
+    }
+}
+
+void
+glamor_finish_access_picture(PicturePtr picture)
+{
+    if (!picture || !picture->pDrawable)
+        return;
+
+    glamor_finish_access(picture->pDrawable);
+}
+
+/*
+ * Make a GC ready to use with fb. This just
+ * means making sure the appropriate fill pixmap is
+ * in CPU memory again
+ */
+
+Bool
+glamor_prepare_access_gc(GCPtr gc)
+{
+    switch (gc->fillStyle) {
+    case FillTiled:
+        return glamor_prepare_access(&gc->tile.pixmap->drawable,
+                                     GLAMOR_ACCESS_RO);
+    case FillStippled:
+    case FillOpaqueStippled:
+        return glamor_prepare_access(&gc->stipple->drawable, GLAMOR_ACCESS_RO);
+    }
+    return TRUE;
+}
+
+/*
+ * Free any temporary CPU pixmaps for the GC
+ */
+void
+glamor_finish_access_gc(GCPtr gc)
+{
+    switch (gc->fillStyle) {
+    case FillTiled:
+        glamor_finish_access(&gc->tile.pixmap->drawable);
+        break;
+    case FillStippled:
+    case FillOpaqueStippled:
+        glamor_finish_access(&gc->stipple->drawable);
+        break;
+    }
+}