The hardware can actually generates vertexid when vertices come from
a client-side buffer like when glDrawElements is used.
This doesn't fix (or break) any piglit tests but it improves the
previous attempt of Ilia (c830d19 "nv50: avoid using inline vertex
data submit when gl_VertexID is used")
The only disadvantage is that only works on G84+, but we don't really
care of that weird and old NV50 chipset.
Changes from v2:
- use NV84_3D previously introduced
- reset gl_VertexID after the draw is done
Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
src/gallium/drivers/nouveau/nv50/nv50_program.c | 3 +-
src/gallium/drivers/nouveau/nv50/nv50_program.h | 2 +-
src/gallium/drivers/nouveau/nv50/nv50_push.c | 42 +++++++++++++++++++++-
.../drivers/nouveau/nv50/nv50_state_validate.c | 3 +-
src/gallium/drivers/nouveau/nv50/nv50_vbo.c | 11 +-----
5 files changed, 46 insertions(+), 15 deletions(-)
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_program.c
b/src/gallium/drivers/nouveau/nv50/nv50_program.c
index 48057d2..a4b8ddf 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_program.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_program.c
@@ -66,7 +66,6 @@ nv50_vertprog_assign_slots(struct nv50_ir_prog_info *info)
case TGSI_SEMANTIC_VERTEXID:
prog->vp.attrs[2] |= NV50_3D_VP_GP_BUILTIN_ATTR_EN_VERTEX_ID;
prog->vp.attrs[2] |=
NV50_3D_VP_GP_BUILTIN_ATTR_EN_VERTEX_ID_DRAW_ARRAYS_ADD_START;
- prog->vp.vertexid = 1;
continue;
default:
break;
@@ -383,6 +382,8 @@ nv50_program_translate(struct nv50_program *prog, uint16_t
chipset,
prog->max_gpr = MAX2(4, (info->bin.maxGPR >> 1) + 1);
prog->tls_space = info->bin.tlsSpace;
+ prog->vp.need_vertex_id = info->io.vertexId < PIPE_MAX_SHADER_INPUTS;
+
if (prog->type == PIPE_SHADER_FRAGMENT) {
if (info->prop.fp.writesDepth) {
prog->fp.flags[0] |= NV50_3D_FP_CONTROL_EXPORTS_Z;
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_program.h
b/src/gallium/drivers/nouveau/nv50/nv50_program.h
index f001670..1de5122 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_program.h
+++ b/src/gallium/drivers/nouveau/nv50/nv50_program.h
@@ -76,9 +76,9 @@ struct nv50_program {
ubyte psiz; /* output slot of point size */
ubyte bfc[2]; /* indices into varying for FFC (FP) or BFC (VP) */
ubyte edgeflag;
- ubyte vertexid;
ubyte clpd[2]; /* output slot of clip distance[i]'s 1st component */
ubyte clpd_nr;
+ bool need_vertex_id;
} vp;
struct {
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_push.c
b/src/gallium/drivers/nouveau/nv50/nv50_push.c
index f31eaa0..cbef95d 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_push.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_push.c
@@ -24,6 +24,10 @@ struct push_context {
struct translate *translate;
bool primitive_restart;
+
+ bool need_vertex_id;
+ int32_t index_bias;
+
uint32_t prim;
uint32_t restart_index;
uint32_t instance_id;
@@ -74,6 +78,11 @@ emit_vertices_i08(struct push_context *ctx, unsigned start,
unsigned count)
size = ctx->vertex_words * nr;
+ if (unlikely(ctx->need_vertex_id)) {
+ BEGIN_NV04(ctx->push, NV84_3D(VERTEX_ID_BASE), 1);
+ PUSH_DATA (ctx->push, *elts + ctx->index_bias);
+ }
+
BEGIN_NI04(ctx->push, NV50_3D(VERTEX_DATA), size);
ctx->translate->run_elts8(ctx->translate, elts, nr, 0, ctx->instance_id,
@@ -107,6 +116,11 @@ emit_vertices_i16(struct push_context *ctx, unsigned
start, unsigned count)
size = ctx->vertex_words * nr;
+ if (unlikely(ctx->need_vertex_id)) {
+ BEGIN_NV04(ctx->push, NV84_3D(VERTEX_ID_BASE), 1);
+ PUSH_DATA (ctx->push, *elts + ctx->index_bias);
+ }
+
BEGIN_NI04(ctx->push, NV50_3D(VERTEX_DATA), size);
ctx->translate->run_elts16(ctx->translate, elts, nr, 0,
ctx->instance_id,
@@ -140,6 +154,11 @@ emit_vertices_i32(struct push_context *ctx, unsigned
start, unsigned count)
size = ctx->vertex_words * nr;
+ if (unlikely(ctx->need_vertex_id)) {
+ BEGIN_NV04(ctx->push, NV84_3D(VERTEX_ID_BASE), 1);
+ PUSH_DATA (ctx->push, *elts + ctx->index_bias);
+ }
+
BEGIN_NI04(ctx->push, NV50_3D(VERTEX_DATA), size);
ctx->translate->run_elts(ctx->translate, elts, nr, 0, ctx->instance_id,
@@ -161,10 +180,18 @@ emit_vertices_i32(struct push_context *ctx, unsigned
start, unsigned count)
static void
emit_vertices_seq(struct push_context *ctx, unsigned start, unsigned count)
{
+ uint32_t elts = 0;
+
while (count) {
unsigned push = MIN2(count, ctx->packet_vertex_limit);
unsigned size = ctx->vertex_words * push;
+ if (unlikely(ctx->need_vertex_id)) {
+ /* For non-indexed draws, gl_VertexID goes up after each vertex. */
+ BEGIN_NV04(ctx->push, NV84_3D(VERTEX_ID_BASE), 1);
+ PUSH_DATA (ctx->push, elts++);
+ }
+
BEGIN_NI04(ctx->push, NV50_3D(VERTEX_DATA), size);
ctx->translate->run(ctx->translate, start, push, 0, ctx->instance_id,
@@ -216,7 +243,14 @@ nv50_push_vbo(struct nv50_context *nv50, const struct
pipe_draw_info *info)
ctx.push = nv50->base.pushbuf;
ctx.translate = nv50->vertex->translate;
- ctx.packet_vertex_limit = nv50->vertex->packet_vertex_limit;
+
+ ctx.need_vertex_id = nv50->screen->base.class_3d >= NV84_3D_CLASS &&
+ nv50->vertprog->vp.need_vertex_id && (nv50->vertex->num_elements < 32);
+ ctx.index_bias = info->index_bias;
+
+ /* For indexed draws, gl_VertexID must be emitted for every vertex. */
+ ctx.packet_vertex_limit =
+ ctx.need_vertex_id ? 1 : nv50->vertex->packet_vertex_limit;
ctx.vertex_words = nv50->vertex->vertex_size;
assert(nv50->num_vtxbufs <= PIPE_MAX_ATTRIBS);
@@ -307,4 +341,10 @@ nv50_push_vbo(struct nv50_context *nv50, const struct
pipe_draw_info *info)
ctx.instance_id++;
ctx.prim |= NV50_3D_VERTEX_BEGIN_GL_INSTANCE_NEXT;
}
+
+ if (unlikely(ctx.need_vertex_id)) {
+ /* Reset gl_VertexID to prevent future indexed draws to be confused. */
+ BEGIN_NV04(ctx.push, NV84_3D(VERTEX_ID_BASE), 1);
+ PUSH_DATA (ctx.push, nv50->state.index_bias);
+ }
}
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c
b/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c
index b6181ed..02a759c 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c
@@ -503,8 +503,7 @@ static struct state_validate {
{ nv50_validate_samplers, NV50_NEW_SAMPLERS },
{ nv50_stream_output_validate, NV50_NEW_STRMOUT |
NV50_NEW_VERTPROG | NV50_NEW_GMTYPROG },
- { nv50_vertex_arrays_validate, NV50_NEW_VERTEX | NV50_NEW_ARRAYS |
- NV50_NEW_VERTPROG },
+ { nv50_vertex_arrays_validate, NV50_NEW_VERTEX | NV50_NEW_ARRAYS },
{ nv50_validate_min_samples, NV50_NEW_MIN_SAMPLES },
};
#define validate_list_len (sizeof(validate_list) / sizeof(validate_list[0]))
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_vbo.c
b/src/gallium/drivers/nouveau/nv50/nv50_vbo.c
index ac0c4d9..85878d5 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_vbo.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_vbo.c
@@ -294,8 +294,7 @@ nv50_vertex_arrays_validate(struct nv50_context *nv50)
uint64_t addrs[PIPE_MAX_ATTRIBS];
uint32_t limits[PIPE_MAX_ATTRIBS];
struct nouveau_pushbuf *push = nv50->base.pushbuf;
- struct nv50_vertex_stateobj dummy = {};
- struct nv50_vertex_stateobj *vertex = nv50->vertex ? nv50->vertex : &dummy;
+ struct nv50_vertex_stateobj *vertex = nv50->vertex;
struct pipe_vertex_buffer *vb;
struct nv50_vertex_element *ve;
uint32_t mask;
@@ -303,14 +302,6 @@ nv50_vertex_arrays_validate(struct nv50_context *nv50)
unsigned i;
const unsigned n = MAX2(vertex->num_elements, nv50->state.num_vtxelts);
- /* A vertexid is not generated for inline data uploads. Have to use a
- * VBO. This check must come after the vertprog has been validated,
- * otherwise vertexid may be unset.
- */
- assert(nv50->vertprog->translated);
- if (nv50->vertprog->vp.vertexid)
- nv50->vbo_push_hint = 0;
-
if (unlikely(vertex->need_conversion))
nv50->vbo_fifo = ~0;
else
--
2.6.2
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