nv50: make edgeflags work

It doesn't seem to be possible to set the egdeflag in the
vertex shader, so we need to fallback to pushing vertices
through the FIFO and use method 0x15e4 if they are used.

This only works if VP does MOV OUT[X] IN[Y] where X is the
edgeflag output, and Y is saved so we can tell the correct
input later.

The VP still writes the useless values to wasted outputs
as punishment.

1 files changed, 44 insertions, 1 deletions

diff --git a/src/gallium/drivers/nv50/nv50_vbo.c b/src/gallium/drivers/nv50/nv50_vbo.c
index f7fa0659e8..39324e30f6 100644
--- a/src/gallium/drivers/nv50/nv50_vbo.c
+++ b/src/gallium/drivers/nv50/nv50_vbo.c
@@ -372,6 +372,10 @@ nv50_vbo_static_attrib(struct nv50_context *nv50, unsigned attrib,
 		so_data  (so, fui(v[1]));
 		break;
 	case 1:
+		if (attrib == nv50->vertprog->cfg.edgeflag_in) {
+			so_method(so, tesla, 0x15e4, 1);
+			so_data  (so, v[0] ? 1 : 0);
+		}
 		so_method(so, tesla, NV50TCL_VTX_ATTR_1F(attrib), 1);
 		so_data  (so, fui(v[0]));
 		break;
@@ -401,6 +405,9 @@ nv50_vbo_validate(struct nv50_context *nv50)
 		    !(nv50->vtxbuf[i].buffer->usage & PIPE_BUFFER_USAGE_VERTEX))
 			nv50->vbo_fifo = 0xffff;
 
+	if (nv50->vertprog->cfg.edgeflag_in < 16)
+		nv50->vbo_fifo = 0xffff; /* vertprog can't set edgeflag */
+
 	n_ve = MAX2(nv50->vtxelt_nr, nv50->state.vtxelt_nr);
 
 	vtxattr = NULL;
@@ -479,6 +486,9 @@ struct nv50_vbo_emitctx
 	unsigned nr_ve;
 	unsigned vtx_dwords;
 	unsigned vtx_max;
+
+	float edgeflag;
+	unsigned ve_edgeflag;
 };
 
 static INLINE void
@@ -622,6 +632,9 @@ emit_prepare(struct nv50_context *nv50, struct nv50_vbo_emitctx *emit,
 	if (nv50_map_vbufs(nv50) == FALSE)
 		return FALSE;
 
+	emit->ve_edgeflag = nv50->vertprog->cfg.edgeflag_in;
+
+	emit->edgeflag = 0.5f;
 	emit->nr_ve = 0;
 	emit->vtx_dwords = 0;
 
@@ -644,7 +657,8 @@ emit_prepare(struct nv50_context *nv50, struct nv50_vbo_emitctx *emit,
 		desc = util_format_description(ve->src_format);
 		assert(desc);
 
-		size = util_format_get_component_bits(ve->src_format, UTIL_FORMAT_COLORSPACE_RGB, 0);
+		size = util_format_get_component_bits(
+			ve->src_format, UTIL_FORMAT_COLORSPACE_RGB, 0);
 
 		assert(ve->nr_components > 0 && ve->nr_components <= 4);
 
@@ -686,10 +700,31 @@ emit_prepare(struct nv50_context *nv50, struct nv50_vbo_emitctx *emit,
 	}
 
 	emit->vtx_max = 512 / emit->vtx_dwords;
+	if (emit->ve_edgeflag < 16)
+		emit->vtx_max = 1;
 
 	return TRUE;
 }
 
+static INLINE void
+set_edgeflag(struct nouveau_channel *chan,
+	     struct nouveau_grobj *tesla,
+	     struct nv50_vbo_emitctx *emit, uint32_t index)
+{
+	unsigned i = emit->ve_edgeflag;
+
+	if (i < 16) {
+		float f = *((float *)(emit->map[i] + index * emit->stride[i]));
+
+		if (emit->edgeflag != f) {
+			emit->edgeflag = f;
+
+			BEGIN_RING(chan, tesla, 0x15e4, 1);
+			OUT_RING  (chan, f ? 1 : 0);
+		}
+	}
+}
+
 static boolean
 nv50_push_arrays(struct nv50_context *nv50, unsigned start, unsigned count)
 {
@@ -704,6 +739,8 @@ nv50_push_arrays(struct nv50_context *nv50, unsigned start, unsigned count)
 		unsigned i, dw, nr = MIN2(count, emit.vtx_max);
 	        dw = nr * emit.vtx_dwords;
 
+		set_edgeflag(chan, tesla, &emit, 0); /* nr will be 1 */
+
 		BEGIN_RING(chan, tesla, NV50TCL_VERTEX_DATA | 0x40000000, dw);
 		for (i = 0; i < nr; ++i)
 			emit_vtx_next(chan, &emit);
@@ -729,6 +766,8 @@ nv50_push_elements_u32(struct nv50_context *nv50, uint32_t *map, unsigned count)
 		unsigned i, dw, nr = MIN2(count, emit.vtx_max);
 	        dw = nr * emit.vtx_dwords;
 
+		set_edgeflag(chan, tesla, &emit, *map);
+
 		BEGIN_RING(chan, tesla, NV50TCL_VERTEX_DATA | 0x40000000, dw);
 		for (i = 0; i < nr; ++i)
 			emit_vtx(chan, &emit, *map++);
@@ -754,6 +793,8 @@ nv50_push_elements_u16(struct nv50_context *nv50, uint16_t *map, unsigned count)
 		unsigned i, dw, nr = MIN2(count, emit.vtx_max);
 	        dw = nr * emit.vtx_dwords;
 
+		set_edgeflag(chan, tesla, &emit, *map);
+
 		BEGIN_RING(chan, tesla, NV50TCL_VERTEX_DATA | 0x40000000, dw);
 		for (i = 0; i < nr; ++i)
 			emit_vtx(chan, &emit, *map++);
@@ -779,6 +820,8 @@ nv50_push_elements_u08(struct nv50_context *nv50, uint8_t *map, unsigned count)
 		unsigned i, dw, nr = MIN2(count, emit.vtx_max);
 	        dw = nr * emit.vtx_dwords;
 
+		set_edgeflag(chan, tesla, &emit, *map);
+
 		BEGIN_RING(chan, tesla, NV50TCL_VERTEX_DATA | 0x40000000, dw);
 		for (i = 0; i < nr; ++i)
 			emit_vtx(chan, &emit, *map++);