tgsi,st/mesa: move varying slot to semantic mapping into a helper for VS

We will use this helper in radeonsi's NIR path.

Reviewed-by: Samuel Pitoiset <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

3 files changed, 195 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index 99ab0c00bb5..9ae8e6c8ca5 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -147,6 +147,8 @@ C_SOURCES := \
 	tgsi/tgsi_exec.h \
 	tgsi/tgsi_emulate.c \
 	tgsi/tgsi_emulate.h \
+	tgsi/tgsi_from_mesa.c \
+	tgsi/tgsi_from_mesa.h \
 	tgsi/tgsi_info.c \
 	tgsi/tgsi_info.h \
 	tgsi/tgsi_iterate.c \
diff --git a/src/gallium/auxiliary/tgsi/tgsi_from_mesa.c b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.c
new file mode 100644
index 00000000000..44fae1c28e6
--- /dev/null
+++ b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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 "tgsi/tgsi_from_mesa.h"
+
+#include "pipe/p_compiler.h"
+
+/**
+ * Determine the semantic index that is used when the given varying is mapped
+ * to TGSI_SEMANTIC_GENERIC.
+ */
+unsigned
+tgsi_get_generic_gl_varying_index(gl_varying_slot attr,
+                                  bool needs_texcoord_semantic)
+{
+   if (attr >= VARYING_SLOT_VAR0) {
+      if (needs_texcoord_semantic)
+         return attr - VARYING_SLOT_VAR0;
+      else
+         return 9 + (attr - VARYING_SLOT_VAR0);
+   }
+   if (attr == VARYING_SLOT_PNTC) {
+      assert(!needs_texcoord_semantic);
+      return 8;
+   }
+   if (attr >= VARYING_SLOT_TEX0 && attr <= VARYING_SLOT_TEX7) {
+      assert(!needs_texcoord_semantic);
+      return attr - VARYING_SLOT_TEX0;
+   }
+
+   assert(0);
+   return 0;
+}
+
+/**
+ * Determine the semantic name and index used for the given varying.
+ */
+void
+tgsi_get_gl_varying_semantic(gl_varying_slot attr,
+                             bool needs_texcoord_semantic,
+                             unsigned *semantic_name,
+                             unsigned *semantic_index)
+{
+   switch (attr) {
+   case VARYING_SLOT_POS:
+      *semantic_name = TGSI_SEMANTIC_POSITION;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_COL0:
+      *semantic_name = TGSI_SEMANTIC_COLOR;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_COL1:
+      *semantic_name = TGSI_SEMANTIC_COLOR;
+      *semantic_index = 1;
+      break;
+   case VARYING_SLOT_BFC0:
+      *semantic_name = TGSI_SEMANTIC_BCOLOR;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_BFC1:
+      *semantic_name = TGSI_SEMANTIC_BCOLOR;
+      *semantic_index = 1;
+      break;
+   case VARYING_SLOT_FOGC:
+      *semantic_name = TGSI_SEMANTIC_FOG;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_PSIZ:
+      *semantic_name = TGSI_SEMANTIC_PSIZE;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_CLIP_DIST0:
+      *semantic_name = TGSI_SEMANTIC_CLIPDIST;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_CLIP_DIST1:
+      *semantic_name = TGSI_SEMANTIC_CLIPDIST;
+      *semantic_index = 1;
+      break;
+   case VARYING_SLOT_CULL_DIST0:
+   case VARYING_SLOT_CULL_DIST1:
+      /* these should have been lowered by GLSL */
+      assert(0);
+      break;
+   case VARYING_SLOT_EDGE:
+      *semantic_name = TGSI_SEMANTIC_EDGEFLAG;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_CLIP_VERTEX:
+      *semantic_name = TGSI_SEMANTIC_CLIPVERTEX;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_LAYER:
+      *semantic_name = TGSI_SEMANTIC_LAYER;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_VIEWPORT:
+      *semantic_name = TGSI_SEMANTIC_VIEWPORT_INDEX;
+      *semantic_index = 0;
+      break;
+   case VARYING_SLOT_PNTC:
+      *semantic_name = TGSI_SEMANTIC_PCOORD;
+      *semantic_index = 0;
+      break;
+
+   case VARYING_SLOT_TEX0:
+   case VARYING_SLOT_TEX1:
+   case VARYING_SLOT_TEX2:
+   case VARYING_SLOT_TEX3:
+   case VARYING_SLOT_TEX4:
+   case VARYING_SLOT_TEX5:
+   case VARYING_SLOT_TEX6:
+   case VARYING_SLOT_TEX7:
+      if (needs_texcoord_semantic) {
+         *semantic_name = TGSI_SEMANTIC_TEXCOORD;
+         *semantic_index = attr - VARYING_SLOT_TEX0;
+         break;
+      }
+      /* fall through */
+   case VARYING_SLOT_VAR0:
+   default:
+      assert(attr >= VARYING_SLOT_VAR0 ||
+             (attr >= VARYING_SLOT_TEX0 && attr <= VARYING_SLOT_TEX7));
+      *semantic_name = TGSI_SEMANTIC_GENERIC;
+      *semantic_index =
+         tgsi_get_generic_gl_varying_index(attr, needs_texcoord_semantic);
+      break;
+   }
+}
diff --git a/src/gallium/auxiliary/tgsi/tgsi_from_mesa.h b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.h
new file mode 100644
index 00000000000..4c708f4e59f
--- /dev/null
+++ b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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 TGSI_FROM_MESA_H
+#define TGSI_FROM_MESA_H
+
+#include <stdbool.h>
+
+#include "pipe/p_shader_tokens.h"
+
+#include "compiler/shader_enums.h"
+
+void
+tgsi_get_gl_varying_semantic(gl_varying_slot attr,
+                             bool needs_texcoord_semantic,
+                             unsigned *semantic_name,
+                             unsigned *semantic_index);
+
+unsigned
+tgsi_get_generic_gl_varying_index(gl_varying_slot attr,
+                                  bool needs_texcoord_semantic);
+
+#endif /* TGSI_FROM_MESA_H */