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authorLuca Barbieri <luca@luca-barbieri.com>2010-08-03 21:20:53 +0200
committerLuca Barbieri <luca@luca-barbieri.com>2010-08-11 13:03:00 +0200
commitb85c71d4e1e4ed788be834dff5b7b3c0cd0402ac (patch)
tree2e4cb857e9df4f0811dfc1d8c3022451f006c50d /src/gallium/auxiliary/util/u_staging.c
parent6f3c4819ecf397cf9efee0213e628e15c1bc704d (diff)
auxiliary: support for transfers using staging resources
Direct3D 10/11 has no concept of transfers. Applications instead create resources with a STAGING or DYNAMIC usage, copy between them and the real resource and use Map to map the STAGING/DYNAMIC resource. This util module allows to implement Gallium drivers as a Direct3D driver would be implemented: transfers allocate a resource with PIPE_USAGE_STAGING, and copy the data between it and the real resource with resource_copy_region.
Diffstat (limited to 'src/gallium/auxiliary/util/u_staging.c')
-rw-r--r--src/gallium/auxiliary/util/u_staging.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_staging.c b/src/gallium/auxiliary/util/u_staging.c
new file mode 100644
index 0000000000..4853aaf6d9
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_staging.c
@@ -0,0 +1,93 @@
+#include "util/u_staging.h"
+#include "pipe/p_context.h"
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+
+static void
+util_staging_resource_template(struct pipe_resource *pt, unsigned width, unsigned height, unsigned depth, struct pipe_resource *template)
+{
+ memset(template, 0, sizeof(struct pipe_resource));
+ if(pt->target != PIPE_BUFFER && depth <= 1)
+ template->target = PIPE_TEXTURE_2D;
+ else
+ template->target = pt->target;
+ template->format = pt->format;
+ template->width0 = width;
+ template->height0 = height;
+ template->depth0 = depth;
+ template->last_level = 0;
+ template->nr_samples = pt->nr_samples;
+ template->bind = 0;
+ template->usage = PIPE_USAGE_STAGING;
+ template->flags = 0;
+}
+
+inline struct util_staging_transfer *
+util_staging_transfer_new(struct pipe_context *pipe,
+ struct pipe_resource *pt,
+ struct pipe_subresource sr,
+ unsigned usage,
+ const struct pipe_box *box,
+ bool direct)
+{
+ struct pipe_screen *pscreen = pipe->screen;
+ struct util_staging_transfer *tx;
+ struct pipe_resource staging_resource_template;
+
+ tx = CALLOC_STRUCT(util_staging_transfer);
+ if (!tx)
+ return NULL;
+
+ pipe_resource_reference(&tx->base.resource, pt);
+ tx->base.sr = sr;
+ tx->base.usage = usage;
+ tx->base.box = *box;
+
+ if (direct)
+ {
+ tx->staging_resource = pt;
+ return tx;
+ }
+
+ util_staging_resource_template(pt, box->width, box->height, box->depth, &staging_resource_template);
+ tx->staging_resource = pscreen->resource_create(pscreen, &staging_resource_template);
+ if (!tx->staging_resource)
+ {
+ pipe_resource_reference(&tx->base.resource, NULL);
+ FREE(tx);
+ return NULL;
+ }
+
+ if (usage & PIPE_TRANSFER_READ)
+ {
+ struct pipe_subresource dstsr;
+ dstsr.face = 0;
+ dstsr.level = 0;
+ for(unsigned zi = 0; zi < box->depth; ++zi)
+ pipe->resource_copy_region(pipe, tx->staging_resource, dstsr, 0, 0, 0, tx->base.resource, sr, box->x, box->y, box->z + zi, box->width, box->height);
+ }
+
+ return tx;
+}
+
+void
+util_staging_transfer_destroy(struct pipe_context *pipe, struct pipe_transfer *ptx)
+{
+ struct util_staging_transfer *tx = (struct util_staging_transfer *)ptx;
+
+ if (tx->staging_resource != tx->base.resource)
+ {
+ if(tx->base.usage & PIPE_TRANSFER_WRITE) {
+ struct pipe_subresource srcsr;
+ srcsr.face = 0;
+ srcsr.level = 0;
+ for(unsigned zi = 0; zi < tx->base.box.depth; ++zi)
+ pipe->resource_copy_region(pipe, tx->base.resource, tx->base.sr, tx->base.box.x, tx->base.box.y, tx->base.box.z + zi, tx->staging_resource, srcsr, 0, 0, 0, tx->base.box.width, tx->base.box.height);
+ }
+
+ pipe_resource_reference(&tx->staging_resource, NULL);
+ }
+
+ pipe_resource_reference(&ptx->resource, NULL);
+ FREE(ptx);
+}