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nir/lower_clip: add lower_clip_outputs() helper

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This will be reused in the following patch to add support for clip
vertex lowering in geometry shaders.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Timothy Arceri
2019-06-28 10:50:15 +10:00
parent a59926b3ca
commit 4b08bb4770
1 changed files with 51 additions and 42 deletions
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93
src/compiler/nir/nir_lower_clip.c
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@@ -189,6 +189,56 @@ find_clipvertex_and_position_outputs(nir_shader *shader,
return *clipvertex || *position;
}
static void
lower_clip_outputs(nir_builder *b, nir_variable *position,
nir_variable *clipvertex, nir_variable **out,
unsigned ucp_enables, bool use_vars)
{
nir_ssa_def *clipdist[MAX_CLIP_PLANES];
nir_ssa_def *cv;
if (use_vars) {
cv = nir_load_var(b, clipvertex ? clipvertex : position);
if (clipvertex) {
exec_node_remove(&clipvertex->node);
clipvertex->data.mode = nir_var_shader_temp;
exec_list_push_tail(&b->shader->globals, &clipvertex->node);
}
} else {
if (clipvertex)
cv = find_output(b->shader, clipvertex->data.driver_location);
else {
assert(position);
cv = find_output(b->shader, position->data.driver_location);
}
}
for (int plane = 0; plane < MAX_CLIP_PLANES; plane++) {
if (ucp_enables & (1 << plane)) {
nir_ssa_def *ucp = nir_load_user_clip_plane(b, plane);
/* calculate clipdist[plane] - dot(ucp, cv): */
clipdist[plane] = nir_fdot4(b, ucp, cv);
} else {
/* 0.0 == don't-clip == disabled: */
clipdist[plane] = nir_imm_float(b, 0.0);
}
}
if (use_vars) {
if (ucp_enables & 0x0f)
nir_store_var(b, out[0], nir_vec(b, clipdist, 4), 0xf);
if (ucp_enables & 0xf0)
nir_store_var(b, out[1], nir_vec(b, &clipdist[4], 4), 0xf);
} else {
if (ucp_enables & 0x0f)
store_clipdist_output(b, out[0], &clipdist[0]);
if (ucp_enables & 0xf0)
store_clipdist_output(b, out[1], &clipdist[4]);
}
}
/*
* VS lowering
*/
@@ -203,12 +253,10 @@ bool
nir_lower_clip_vs(nir_shader *shader, unsigned ucp_enables, bool use_vars)
{
nir_function_impl *impl = nir_shader_get_entrypoint(shader);
nir_ssa_def *clipdist[MAX_CLIP_PLANES];
nir_builder b;
int maxloc = -1;
nir_variable *position = NULL;
nir_variable *clipvertex = NULL;
nir_ssa_def *cv;
nir_variable *out[2] = { NULL };
if (!ucp_enables)
@@ -232,49 +280,10 @@ nir_lower_clip_vs(nir_shader *shader, unsigned ucp_enables, bool use_vars)
if (!find_clipvertex_and_position_outputs(shader, &clipvertex, &position))
return false;
if (use_vars) {
cv = nir_load_var(&b, clipvertex ? clipvertex : position);
if (clipvertex) {
exec_node_remove(&clipvertex->node);
clipvertex->data.mode = nir_var_shader_temp;
exec_list_push_tail(&shader->globals, &clipvertex->node);
}
} else {
if (clipvertex)
cv = find_output(shader, clipvertex->data.driver_location);
else {
assert(position);
cv = find_output(shader, position->data.driver_location);
}
}
/* insert CLIPDIST outputs */
create_clipdist_vars(shader, out, ucp_enables, &maxloc, true);
for (int plane = 0; plane < MAX_CLIP_PLANES; plane++) {
if (ucp_enables & (1 << plane)) {
nir_ssa_def *ucp = nir_load_user_clip_plane(&b, plane);
/* calculate clipdist[plane] - dot(ucp, cv): */
clipdist[plane] = nir_fdot4(&b, ucp, cv);
} else {
/* 0.0 == don't-clip == disabled: */
clipdist[plane] = nir_imm_float(&b, 0.0);
}
}
if (use_vars) {
if (ucp_enables & 0x0f)
nir_store_var(&b, out[0], nir_vec(&b, clipdist, 4), 0xf);
if (ucp_enables & 0xf0)
nir_store_var(&b, out[1], nir_vec(&b, &clipdist[4], 4), 0xf);
} else {
if (ucp_enables & 0x0f)
store_clipdist_output(&b, out[0], &clipdist[0]);
if (ucp_enables & 0xf0)
store_clipdist_output(&b, out[1], &clipdist[4]);
}
lower_clip_outputs(&b, position, clipvertex, out, ucp_enables, use_vars);
nir_metadata_preserve(impl, nir_metadata_dominance);