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nir: handle primitives with adjacency

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`nir_create_passthrough_gs` can now handle primitives with adjacency where some
vertices need to be skipped.

Fixes: d0342e28b3 ("nir: Add helper to create passthrough GS shader")
Acked-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21238>
This commit is contained in:
antonino
2023-02-13 12:57:38 +01:00
committed by Marge Bot
parent eedbf9046e
commit ea14579f3d
1 changed files with 19 additions and 1 deletions
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20
src/compiler/nir/nir_passthrough_gs.c
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@@ -89,7 +89,25 @@ nir_create_passthrough_gs(const nir_shader_compiler_options *options,
out_vars[num_vars++] = out; out_vars[num_vars++] = out;
} }
for (unsigned i = 0; i < vertices; ++i) { unsigned int start_vert = 0;
unsigned int end_vert = vertices;
unsigned int vert_step = 1;
switch (primitive_type) {
case PIPE_PRIM_LINES_ADJACENCY:
case PIPE_PRIM_LINE_STRIP_ADJACENCY:
start_vert = 1;
end_vert += 1;
break;
case PIPE_PRIM_TRIANGLES_ADJACENCY:
case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
end_vert = 5;
vert_step = 2;
break;
default:
break;
}
for (unsigned i = start_vert; i < end_vert; i += vert_step) {
/* Copy inputs to outputs. */ /* Copy inputs to outputs. */
for (unsigned j = 0; j < num_vars; ++j) { for (unsigned j = 0; j < num_vars; ++j) {
/* no need to use copy_var to save a lower pass */ /* no need to use copy_var to save a lower pass */