[Mesa-dev] [PATCH 1/8] draw: rework hanndling of non-existing outputs in emit code
Jose Fonseca
jfonseca at vmware.com
Tue Dec 22 05:37:13 PST 2015
On 22/12/15 03:00, sroland at vmware.com wrote:
> From: Roland Scheidegger <sroland at vmware.com>
>
> Previously the code would just redirect requests for attributes which
> don't exist to use output 0. Rework this to output all zeros instead which
> seems more useful - in particular some extensions like
> ARB_fragment_layer_viewport require 0 in the fs even if it wasn't output by
> previous stages. That way, drivers don't have to special case this depending
> if the vs/gs outputs some attribute or not.
> ---
> src/gallium/auxiliary/draw/draw_pipe_vbuf.c | 52 +++++++++++++++++------------
> src/gallium/auxiliary/draw/draw_pt_emit.c | 12 +++++++
> src/gallium/auxiliary/draw/draw_vertex.h | 4 +--
> 3 files changed, 45 insertions(+), 23 deletions(-)
>
> diff --git a/src/gallium/auxiliary/draw/draw_pipe_vbuf.c b/src/gallium/auxiliary/draw/draw_pipe_vbuf.c
> index f36706c..81c4fed 100644
> --- a/src/gallium/auxiliary/draw/draw_pipe_vbuf.c
> +++ b/src/gallium/auxiliary/draw/draw_pipe_vbuf.c
> @@ -74,9 +74,10 @@ struct vbuf_stage {
> unsigned max_indices;
> unsigned nr_indices;
>
> - /* Cache point size somewhere it's address won't change:
> + /* Cache point size somewhere its address won't change:
> */
> float point_size;
> + float zero4[4];
>
> struct translate_cache *cache;
> };
> @@ -205,6 +206,7 @@ vbuf_start_prim( struct vbuf_stage *vbuf, uint prim )
> struct translate_key hw_key;
> unsigned dst_offset;
> unsigned i;
> + const struct vertex_info *vinfo;
>
> vbuf->render->set_primitive(vbuf->render, prim);
>
> @@ -215,27 +217,33 @@ vbuf_start_prim( struct vbuf_stage *vbuf, uint prim )
> * state change.
> */
> vbuf->vinfo = vbuf->render->get_vertex_info(vbuf->render);
> - vbuf->vertex_size = vbuf->vinfo->size * sizeof(float);
> + vinfo = vbuf->vinfo;
> + vbuf->vertex_size = vinfo->size * sizeof(float);
>
> /* Translate from pipeline vertices to hw vertices.
> */
> dst_offset = 0;
>
> - for (i = 0; i < vbuf->vinfo->num_attribs; i++) {
> + for (i = 0; i < vinfo->num_attribs; i++) {
> unsigned emit_sz = 0;
> unsigned src_buffer = 0;
> enum pipe_format output_format;
> - unsigned src_offset = (vbuf->vinfo->attrib[i].src_index * 4 * sizeof(float) );
> + unsigned src_offset = (vinfo->attrib[i].src_index * 4 * sizeof(float) );
>
> - output_format = draw_translate_vinfo_format(vbuf->vinfo->attrib[i].emit);
> - emit_sz = draw_translate_vinfo_size(vbuf->vinfo->attrib[i].emit);
> + output_format = draw_translate_vinfo_format(vinfo->attrib[i].emit);
> + emit_sz = draw_translate_vinfo_size(vinfo->attrib[i].emit);
>
> /* doesn't handle EMIT_OMIT */
> assert(emit_sz != 0);
>
> - if (vbuf->vinfo->attrib[i].emit == EMIT_1F_PSIZE) {
> - src_buffer = 1;
> - src_offset = 0;
> + if (vinfo->attrib[i].emit == EMIT_1F_PSIZE) {
> + src_buffer = 1;
> + src_offset = 0;
> + }
> + else if (vinfo->attrib[i].src_index == 255) {
Let's use a macro for magic number 255.
> + /* elements which don't exist will get assigned zeros */
> + src_buffer = 2;
> + src_offset = 0;
> }
>
> hw_key.element[i].type = TRANSLATE_ELEMENT_NORMAL;
> @@ -249,7 +257,7 @@ vbuf_start_prim( struct vbuf_stage *vbuf, uint prim )
> dst_offset += emit_sz;
> }
>
> - hw_key.nr_elements = vbuf->vinfo->num_attribs;
> + hw_key.nr_elements = vinfo->num_attribs;
> hw_key.output_stride = vbuf->vertex_size;
>
> /* Don't bother with caching at this stage:
> @@ -261,6 +269,7 @@ vbuf_start_prim( struct vbuf_stage *vbuf, uint prim )
> vbuf->translate = translate_cache_find(vbuf->cache, &hw_key);
>
> vbuf->translate->set_buffer(vbuf->translate, 1, &vbuf->point_size, 0, ~0);
> + vbuf->translate->set_buffer(vbuf->translate, 2, &vbuf->zero4[0], 0, ~0);
> }
>
> vbuf->point_size = vbuf->stage.draw->rasterizer->point_size;
> @@ -428,7 +437,7 @@ struct draw_stage *draw_vbuf_stage( struct draw_context *draw,
> struct vbuf_stage *vbuf = CALLOC_STRUCT(vbuf_stage);
> if (!vbuf)
> goto fail;
> -
> +
> vbuf->stage.draw = draw;
> vbuf->stage.name = "vbuf";
> vbuf->stage.point = vbuf_first_point;
> @@ -437,29 +446,30 @@ struct draw_stage *draw_vbuf_stage( struct draw_context *draw,
> vbuf->stage.flush = vbuf_flush;
> vbuf->stage.reset_stipple_counter = vbuf_reset_stipple_counter;
> vbuf->stage.destroy = vbuf_destroy;
> -
> +
> vbuf->render = render;
> vbuf->max_indices = MIN2(render->max_indices, UNDEFINED_VERTEX_ID-1);
>
> - vbuf->indices = (ushort *) align_malloc( vbuf->max_indices *
> - sizeof(vbuf->indices[0]),
> - 16 );
> + vbuf->indices = (ushort *) align_malloc(vbuf->max_indices *
> + sizeof(vbuf->indices[0]),
> + 16);
> if (!vbuf->indices)
> goto fail;
>
> vbuf->cache = translate_cache_create();
> - if (!vbuf->cache)
> + if (!vbuf->cache)
> goto fail;
> -
> -
> +
> vbuf->vertices = NULL;
> vbuf->vertex_ptr = vbuf->vertices;
> -
> +
> + vbuf->zero4[0] = vbuf->zero4[1] = vbuf->zero4[2] = vbuf->zero4[3] = 0.0f;
> +
> return &vbuf->stage;
>
> - fail:
> +fail:
> if (vbuf)
> vbuf_destroy(&vbuf->stage);
> -
> +
> return NULL;
> }
> diff --git a/src/gallium/auxiliary/draw/draw_pt_emit.c b/src/gallium/auxiliary/draw/draw_pt_emit.c
> index 0b9fab5..2fb7756 100644
> --- a/src/gallium/auxiliary/draw/draw_pt_emit.c
> +++ b/src/gallium/auxiliary/draw/draw_pt_emit.c
> @@ -44,6 +44,9 @@ struct pt_emit {
> unsigned prim;
>
> const struct vertex_info *vinfo;
> +
> + float zero4[4];
> +
> };
>
>
> @@ -92,6 +95,11 @@ draw_pt_emit_prepare(struct pt_emit *emit,
> src_buffer = 1;
> src_offset = 0;
> }
> + else if (vinfo->attrib[i].src_index == 255) {
> + /* elements which don't exist will get assigned zeros */
> + src_buffer = 2;
> + src_offset = 0;
> + }
>
> hw_key.element[i].type = TRANSLATE_ELEMENT_NORMAL;
> hw_key.element[i].input_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
> @@ -111,6 +119,8 @@ draw_pt_emit_prepare(struct pt_emit *emit,
> translate_key_compare(&emit->translate->key, &hw_key) != 0) {
> translate_key_sanitize(&hw_key);
> emit->translate = translate_cache_find(emit->cache, &hw_key);
> +
> + emit->translate->set_buffer(emit->translate, 2, &emit->zero4[0], 0, ~0);
> }
>
> if (!vinfo->size)
> @@ -287,6 +297,8 @@ draw_pt_emit_create(struct draw_context *draw)
> return NULL;
> }
>
> + emit->zero4[0] = emit->zero4[1] = emit->zero4[2] = emit->zero4[3] = 0.0f;
> +
> return emit;
> }
>
> diff --git a/src/gallium/auxiliary/draw/draw_vertex.h b/src/gallium/auxiliary/draw/draw_vertex.h
> index ee11d2f..58aa00f 100644
> --- a/src/gallium/auxiliary/draw/draw_vertex.h
> +++ b/src/gallium/auxiliary/draw/draw_vertex.h
> @@ -130,9 +130,9 @@ draw_emit_vertex_attr(struct vertex_info *vinfo,
> const uint n = vinfo->num_attribs;
>
> /* If the src_index is negative, meaning it hasn't been found
> - * lets just redirect it to the first output slot */
> + * we'll assign it all zeros later - set to 255 */
> if (src_index < 0) {
> - src_index = 0;
> + src_index = 255;
> }
>
> assert(n < Elements(vinfo->attrib));
>
Otherwise looks good.
Jose
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