Mesa (master): gallium/tgsi: add helper tgsi_get_interp_mode

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Module: Mesa
Branch: master
Commit: 440aab95c3deac65d1ece587ff33ae7c3bb507cd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=440aab95c3deac65d1ece587ff33ae7c3bb507cd

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Sat Aug 22 06:28:52 2020 -0400

gallium/tgsi: add helper tgsi_get_interp_mode

Reviewed-by: Eric Anholt <eric at anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6442>

---

 src/gallium/auxiliary/tgsi/tgsi_from_mesa.c | 17 +++++++++++++++++
 src/gallium/auxiliary/tgsi/tgsi_from_mesa.h |  3 +++
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp  | 24 +++---------------------
 3 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_from_mesa.c b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.c
index 29fa68da9f0..a7641c11592 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_from_mesa.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.c
@@ -290,3 +290,20 @@ tgsi_get_sysval_semantic(unsigned sysval)
       unreachable("Unexpected system value to TGSI");
    }
 }
+
+enum tgsi_interpolate_mode
+tgsi_get_interp_mode(enum glsl_interp_mode mode, bool color)
+{
+   switch (mode) {
+   case INTERP_MODE_NONE:
+      return color ? TGSI_INTERPOLATE_COLOR : TGSI_INTERPOLATE_PERSPECTIVE;
+   case INTERP_MODE_FLAT:
+      return TGSI_INTERPOLATE_CONSTANT;
+   case INTERP_MODE_NOPERSPECTIVE:
+      return TGSI_INTERPOLATE_LINEAR;
+   case INTERP_MODE_SMOOTH:
+      return TGSI_INTERPOLATE_PERSPECTIVE;
+   default:
+      unreachable("unknown interpolation mode");
+   }
+}
diff --git a/src/gallium/auxiliary/tgsi/tgsi_from_mesa.h b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.h
index 92f08e2211a..e3f1456d88a 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_from_mesa.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_from_mesa.h
@@ -55,6 +55,9 @@ tgsi_get_gl_frag_result_semantic(gl_frag_result frag_result,
 enum tgsi_semantic
 tgsi_get_sysval_semantic(unsigned sysval);
 
+enum tgsi_interpolate_mode
+tgsi_get_interp_mode(enum glsl_interp_mode mode, bool color);
+
 static inline enum pipe_shader_type
 pipe_shader_type_from_mesa(gl_shader_stage stage)
 {
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 7d8f6fc3b25..0fb30bb3b2d 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -6554,26 +6554,6 @@ sort_inout_decls_by_slot(struct inout_decl *decls,
    std::sort(decls, decls + count, sorter);
 }
 
-static enum tgsi_interpolate_mode
-st_translate_interp(enum glsl_interp_mode glsl_qual, GLuint varying)
-{
-   switch (glsl_qual) {
-   case INTERP_MODE_NONE:
-      if (varying == VARYING_SLOT_COL0 || varying == VARYING_SLOT_COL1)
-         return TGSI_INTERPOLATE_COLOR;
-      return TGSI_INTERPOLATE_PERSPECTIVE;
-   case INTERP_MODE_SMOOTH:
-      return TGSI_INTERPOLATE_PERSPECTIVE;
-   case INTERP_MODE_FLAT:
-      return TGSI_INTERPOLATE_CONSTANT;
-   case INTERP_MODE_NOPERSPECTIVE:
-      return TGSI_INTERPOLATE_LINEAR;
-   default:
-      assert(0 && "unexpected interp mode in st_translate_interp()");
-      return TGSI_INTERPOLATE_PERSPECTIVE;
-   }
-}
-
 /**
  * Translate intermediate IR (glsl_to_tgsi_instruction) to TGSI format.
  * \param program  the program to translate
@@ -6682,7 +6662,9 @@ st_translate_program(
             assert(interpMode);
             interp_mode = interpMode[slot] != TGSI_INTERPOLATE_COUNT ?
                (enum tgsi_interpolate_mode) interpMode[slot] :
-               st_translate_interp(decl->interp, inputSlotToAttr[slot]);
+               tgsi_get_interp_mode(decl->interp,
+                                    inputSlotToAttr[slot] == VARYING_SLOT_COL0 ||
+                                    inputSlotToAttr[slot] == VARYING_SLOT_COL1);
 
             interp_location = (enum tgsi_interpolate_loc) decl->interp_loc;
          }