[Mesa-dev] [PATCH 08/11] u_blitter: implement copy_buffer using stream output
Christoph Bumiller
e0425955 at student.tuwien.ac.at
Fri Dec 9 10:21:08 PST 2011
From: Marek Olšák <maraeo at gmail.com>
---
src/gallium/auxiliary/util/u_blitter.c | 87 +++++++++++++++++++++++++++++++-
src/gallium/auxiliary/util/u_blitter.h | 11 ++++
2 files changed, 96 insertions(+), 2 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_blitter.c b/src/gallium/auxiliary/util/u_blitter.c
index c0c477b..3c50181 100644
--- a/src/gallium/auxiliary/util/u_blitter.c
+++ b/src/gallium/auxiliary/util/u_blitter.c
@@ -63,6 +63,7 @@ struct blitter_context_priv
/* Constant state objects. */
/* Vertex shaders. */
void *vs; /**< Vertex shader which passes {pos, generic} to the output.*/
+ void *vs_pos_only; /**< Vertex shader which passes pos to the output.*/
/* Fragment shaders. */
/* The shader at index i outputs color to color buffers 0,1,...,i-1. */
@@ -87,15 +88,18 @@ struct blitter_context_priv
void *dsa_keep_depth_stencil;
void *dsa_keep_depth_write_stencil;
+ /* Vertex elements states. */
void *velem_state;
void *velem_uint_state;
void *velem_sint_state;
+ void *velem_state_readbuf;
/* Sampler state. */
void *sampler_state;
/* Rasterizer state. */
void *rs_state;
+ void *rs_discard_state;
/* Viewport state. */
struct pipe_viewport_state viewport;
@@ -210,7 +214,12 @@ struct blitter_context *util_blitter_create(struct pipe_context *pipe)
rs_state.flatshade = 1;
ctx->rs_state = pipe->create_rasterizer_state(pipe, &rs_state);
- /* vertex elements state */
+ if (ctx->has_stream_out) {
+ rs_state.rasterizer_discard = 1;
+ ctx->rs_discard_state = pipe->create_rasterizer_state(pipe, &rs_state);
+ }
+
+ /* vertex elements states */
memset(&velem[0], 0, sizeof(velem[0]) * 2);
for (i = 0; i < 2; i++) {
velem[i].src_offset = i * 4 * sizeof(float);
@@ -234,9 +243,14 @@ struct blitter_context *util_blitter_create(struct pipe_context *pipe)
ctx->velem_uint_state = pipe->create_vertex_elements_state(pipe, 2, &velem[0]);
}
+ if (ctx->has_stream_out) {
+ velem[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
+ ctx->velem_state_readbuf = pipe->create_vertex_elements_state(pipe, 1, &velem[0]);
+ }
+
/* fragment shaders are created on-demand */
- /* vertex shader */
+ /* vertex shaders */
{
const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
TGSI_SEMANTIC_GENERIC };
@@ -245,6 +259,20 @@ struct blitter_context *util_blitter_create(struct pipe_context *pipe)
util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
semantic_indices);
}
+ if (ctx->has_stream_out) {
+ struct pipe_stream_output_info so;
+ const uint semantic_names[] = { TGSI_SEMANTIC_POSITION };
+ const uint semantic_indices[] = { 0 };
+
+ memset(&so, 0, sizeof(so));
+ so.num_outputs = 1;
+ so.output[0].register_mask = TGSI_WRITEMASK_XYZW;
+ so.stride = 4;
+
+ ctx->vs_pos_only =
+ util_make_vertex_passthrough_shader_with_so(pipe, 1, semantic_names,
+ semantic_indices, &so);
+ }
/* set invariant vertex coordinates */
for (i = 0; i < 4; i++)
@@ -274,12 +302,18 @@ void util_blitter_destroy(struct blitter_context *blitter)
pipe->delete_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_write_stencil);
pipe->delete_rasterizer_state(pipe, ctx->rs_state);
+ if (ctx->rs_discard_state)
+ pipe->delete_rasterizer_state(pipe, ctx->rs_discard_state);
pipe->delete_vs_state(pipe, ctx->vs);
+ if (ctx->vs_pos_only)
+ pipe->delete_vs_state(pipe, ctx->vs_pos_only);
pipe->delete_vertex_elements_state(pipe, ctx->velem_state);
if (ctx->vertex_has_integers) {
pipe->delete_vertex_elements_state(pipe, ctx->velem_sint_state);
pipe->delete_vertex_elements_state(pipe, ctx->velem_uint_state);
}
+ if (ctx->velem_state_readbuf)
+ pipe->delete_vertex_elements_state(pipe, ctx->velem_state_readbuf);
for (i = 0; i < PIPE_MAX_TEXTURE_TYPES; i++) {
if (ctx->fs_texfetch_col[i])
@@ -1178,3 +1212,52 @@ void util_blitter_custom_depth_stencil(struct blitter_context *blitter,
blitter_restore_fb_state(ctx);
blitter_unset_running_flag(ctx);
}
+
+void util_blitter_copy_buffer(struct blitter_context *blitter,
+ struct pipe_resource *dst,
+ unsigned dstx,
+ struct pipe_resource *src,
+ unsigned srcx,
+ unsigned size)
+{
+ struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
+ struct pipe_context *pipe = ctx->base.pipe;
+ struct pipe_vertex_buffer vb;
+ struct pipe_stream_output_target *so_target;
+
+ /* Drivers not capable of Stream Out should not call this function
+ * in the first place. */
+ assert(ctx->has_stream_out);
+
+ /* Some alignment is required. */
+ if (srcx % 4 != 0 || dstx % 4 != 0 || size % 16 != 0 ||
+ !ctx->has_stream_out) {
+ struct pipe_box box;
+ u_box_1d(srcx, size, &box);
+ util_resource_copy_region(pipe, dst, 0, dstx, 0, 0, src, 0, &box);
+ return;
+ }
+
+ blitter_set_running_flag(ctx);
+ blitter_check_saved_vertex_states(ctx);
+
+ vb.buffer = src;
+ vb.buffer_offset = srcx;
+ vb.stride = 4;
+
+ pipe->set_vertex_buffers(pipe, 1, &vb);
+ pipe->bind_vertex_elements_state(pipe, ctx->velem_state_readbuf);
+ pipe->bind_vs_state(pipe, ctx->vs_pos_only);
+ if (ctx->has_geometry_shader)
+ pipe->bind_gs_state(pipe, NULL);
+ pipe->bind_rasterizer_state(pipe, ctx->rs_discard_state);
+
+ so_target = pipe->create_stream_output_target(pipe, dst, dstx, size);
+ pipe->set_stream_output_targets(pipe, 1, &so_target, 0);
+
+ util_draw_arrays(pipe, PIPE_PRIM_POINTS, 0, size / 16);
+
+ blitter_restore_vertex_states(ctx);
+ blitter_unset_running_flag(ctx);
+ pipe_so_target_reference(&so_target, NULL);
+}
diff --git a/src/gallium/auxiliary/util/u_blitter.h b/src/gallium/auxiliary/util/u_blitter.h
index d02cfaf..f605a7e 100644
--- a/src/gallium/auxiliary/util/u_blitter.h
+++ b/src/gallium/auxiliary/util/u_blitter.h
@@ -218,6 +218,17 @@ void util_blitter_copy_texture_view(struct blitter_context *blitter,
unsigned src_width0, unsigned src_height0);
/**
+ * Copy data from one buffer to another using the Stream Output functionality.
+ * Some alignment is required, otherwise software fallback is used.
+ */
+void util_blitter_copy_buffer(struct blitter_context *blitter,
+ struct pipe_resource *dst,
+ unsigned dstx,
+ struct pipe_resource *src,
+ unsigned srcx,
+ unsigned size);
+
+/**
* Clear a region of a (color) surface to a constant value.
*
* These states must be saved in the blitter in addition to the state objects
--
1.7.3.4
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