turnip: Configure VPC for geometry shaders

This commit updates tu6_emit_vpc to selectively emit GS-specifc
configuration. Most of this is repurposed from fd6_program.c.

This also refactors `link_geometry_stages` to ir3_nir_lower_tess.c
so it can be shared between fd and tu.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4436>

1 files changed, 1 insertions, 37 deletions

diff --git a/src/gallium/drivers/freedreno/ir3/ir3_gallium.c b/src/gallium/drivers/freedreno/ir3/ir3_gallium.c
index 31dc82b1b6e..56972a81b9d 100644
--- a/src/gallium/drivers/freedreno/ir3/ir3_gallium.c
+++ b/src/gallium/drivers/freedreno/ir3/ir3_gallium.c
@@ -412,42 +412,6 @@ ir3_emit_immediates(struct fd_screen *screen, const struct ir3_shader_variant *v
 	}
 }
 
-static uint32_t
-link_geometry_stages(const struct ir3_shader_variant *producer,
-		const struct ir3_shader_variant *consumer,
-		uint32_t *locs)
-{
-	uint32_t num_loc = 0, factor;
-
-	switch (consumer->type) {
-	case MESA_SHADER_TESS_CTRL:
-	case MESA_SHADER_GEOMETRY:
-		/* These stages load with ldlw, which expects byte offsets. */
-		factor = 4;
-		break;
-	case MESA_SHADER_TESS_EVAL:
-		/* The tess eval shader uses ldg, which takes dword offsets. */
-		factor = 1;
-		break;
-	default:
-		unreachable("bad shader stage");
-	}
-
-	nir_foreach_variable(in_var, &consumer->shader->nir->inputs) {
-		nir_foreach_variable(out_var, &producer->shader->nir->outputs) {
-			if (in_var->data.location == out_var->data.location) {
-				locs[in_var->data.driver_location] =
-					producer->shader->output_loc[out_var->data.driver_location] * factor;
-
-				debug_assert(num_loc <= in_var->data.driver_location + 1);
-				num_loc = in_var->data.driver_location + 1;
-			}
-		}
-	}
-
-	return num_loc;
-}
-
 void
 ir3_emit_link_map(struct fd_screen *screen,
 		const struct ir3_shader_variant *producer,
@@ -457,7 +421,7 @@ ir3_emit_link_map(struct fd_screen *screen,
 	uint32_t base = const_state->offsets.primitive_map;
 	uint32_t patch_locs[MAX_VARYING] = { }, num_loc;
 
-	num_loc = link_geometry_stages(producer, v, patch_locs);
+	num_loc = ir3_link_geometry_stages(producer, v, patch_locs);
 
 	int size = DIV_ROUND_UP(num_loc, 4);