From: Rob Clark <robcl...@freedesktop.org>
NIR equivalent of tgsi_emulate
Signed-off-by: Rob Clark <robcl...@freedesktop.org>
---
src/gallium/auxiliary/Makefile.sources | 2 +
src/gallium/auxiliary/nir/nir_emulate.c | 177 ++++++++++++++++++++++++++++++++
src/gallium/auxiliary/nir/nir_emulate.h | 34 ++++++
3 files changed, 213 insertions(+)
create mode 100644 src/gallium/auxiliary/nir/nir_emulate.c
create mode 100644 src/gallium/auxiliary/nir/nir_emulate.h
diff --git a/src/gallium/auxiliary/Makefile.sources
b/src/gallium/auxiliary/Makefile.sources
index 6f50f71..c32cfdf 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -311,6 +311,8 @@ C_SOURCES := \
util/u_video.h
NIR_SOURCES := \
+ nir/nir_emulate.c \
+ nir/nir_emulate.h \
nir/tgsi_to_nir.c \
nir/tgsi_to_nir.h
diff --git a/src/gallium/auxiliary/nir/nir_emulate.c
b/src/gallium/auxiliary/nir/nir_emulate.c
new file mode 100644
index 0000000..af1d3bc
--- /dev/null
+++ b/src/gallium/auxiliary/nir/nir_emulate.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright © 2015 Red Hat
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE
+ * SOFTWARE.
+ */
+
+#include "nir/nir_emulate.h"
+
+#include "compiler/nir/nir_builder.h"
+
+typedef struct {
+ nir_shader *shader;
+ nir_builder b;
+ unsigned flags;
+ /* for TGSI_EMU_PASSTHROUGH_EDGEFLAG: */
+ struct {
+ bool emitted;
+ nir_variable *in, *out;
+ } edgeflag;
+} emu_state;
+
+static nir_variable *
+create_edgeflag_var(nir_shader *shader, bool output)
+{
+ nir_variable_mode mode = output ? nir_var_shader_out : nir_var_shader_in;
+ nir_variable *var = nir_variable_create(shader, mode, glsl_vec4_type(),
+ output ? "edgeflag_out" :
"edgeflag_in");
+ var->data.location = output ? VARYING_SLOT_EDGE : VERT_ATTRIB_EDGEFLAG;
+ return var;
+}
+
+static bool
+is_color_output(emu_state *state, nir_variable *out)
+{
+ switch (state->shader->stage) {
+ case MESA_SHADER_VERTEX:
+ case MESA_SHADER_GEOMETRY:
+ switch (out->data.location) {
+ case VARYING_SLOT_COL0:
+ case VARYING_SLOT_COL1:
+ case VARYING_SLOT_BFC0:
+ case VARYING_SLOT_BFC1:
+ return true;
+ default:
+ return false;
+ }
+ break;
+ case MESA_SHADER_FRAGMENT:
+ switch (out->data.location) {
+ case FRAG_RESULT_COLOR:
+ return true;
+ default:
+ return false;
+ }
+ break;
+ default:
+ return false;
+ }
+}
+
+static void
+emu_intrinsic(emu_state *state, nir_intrinsic_instr *intr)
+{
+ nir_variable *out;
+ nir_builder *b = &state->b;
+ nir_ssa_def *s;
+
+ assert(state->flags & TGSI_EMU_CLAMP_COLOR_OUTPUTS);
+
+ if (intr->intrinsic != nir_intrinsic_store_var)
+ return;
+
+ out = intr->variables[0]->var;
+
+ if (out->data.mode != nir_var_shader_out)
+ return;
+
+ /* NOTE: 'out' can be null for types larger than vec4,
+ * but these will never be color out's so we can ignore
+ */
+
+ if (out && is_color_output(state, out)) {
+ b->cursor = nir_before_instr(&intr->instr);
+ s = nir_ssa_for_src(b, intr->src[0], intr->num_components);
+ s = nir_fsat(b, s);
+ nir_instr_rewrite_src(&intr->instr, &intr->src[0], nir_src_for_ssa(s));
+ }
+}
+
+static void
+passthrough_edgeflags(emu_state *state, nir_block *block)
+{
+ nir_builder *b = &state->b;
+ nir_ssa_def *def;
+
+ if (!state->edgeflag.in)
+ state->edgeflag.in = create_edgeflag_var(state->shader, false);
+
+ if (!state->edgeflag.out)
+ state->edgeflag.out = create_edgeflag_var(state->shader, true);
+
+ b->cursor = nir_before_block(block);
+
+ def = nir_load_var(b, state->edgeflag.in);
+ nir_store_var(b, state->edgeflag.out, def, 0xf);
+}
+
+static bool
+emu_block(nir_block *block, void *_state)
+{
+ emu_state *state = _state;
+
+ /* we should hit the first block first.. */
+ if ((state->flags & TGSI_EMU_PASSTHROUGH_EDGEFLAG) &&
+ !state->edgeflag.emitted) {
+ passthrough_edgeflags(state, block);
+ state->edgeflag.emitted = true;
+ }
+
+ /* early return if we don't need per-instruction lowering: */
+ if (!(state->flags & TGSI_EMU_CLAMP_COLOR_OUTPUTS))
+ return false;
+
+ nir_foreach_instr_safe(block, instr) {
+ if (instr->type == nir_instr_type_intrinsic)
+ emu_intrinsic(state, nir_instr_as_intrinsic(instr));
+ }
+
+ return true;
+}
+static void
+emu_impl(emu_state *state, nir_function_impl *impl)
+{
+ nir_builder_init(&state->b, impl);
+
+ nir_foreach_block(impl, emu_block, state);
+ nir_metadata_preserve(impl, nir_metadata_block_index |
+ nir_metadata_dominance);
+}
+
+void nir_emulate(nir_shader *shader, unsigned flags)
+{
+ emu_state state = {
+ .shader = shader,
+ .flags = flags,
+ };
+
+ assert(flags != 0);
+
+ if (flags & TGSI_EMU_FORCE_PERSAMPLE_INTERP) {
+ nir_foreach_variable(var, &shader->inputs) {
+ var->data.sample = true;
+ }
+ }
+
+ nir_foreach_function(shader, function) {
+ if (function->impl)
+ emu_impl(&state, function->impl);
+ }
+}
diff --git a/src/gallium/auxiliary/nir/nir_emulate.h
b/src/gallium/auxiliary/nir/nir_emulate.h
new file mode 100644
index 0000000..9f56620
--- /dev/null
+++ b/src/gallium/auxiliary/nir/nir_emulate.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2015 Red Hat
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE
+ * SOFTWARE.
+ */
+
+#ifndef _NIR_EMULATE_H_
+#define _NIR_EMULATE_H_
+
+#include "tgsi/tgsi_emulate.h" /* for now share TGSI_EMU_x flags */
+
+#include "compiler/nir/nir.h"
+
+
+void nir_emulate(nir_shader *shader, unsigned flags);
+
+#endif /* _NIR_EMULATE_H_ */
--
2.5.0
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