From a02349b9e7e7ff1324cab0b9ebecf3f4fb08ea64 Mon Sep 17 00:00:00 2001
From: Kenneth Graunke <kenneth@whitecape.org>
Date: Sun, 4 Nov 2018 15:42:02 -0800
Subject: [PATCH] st/mesa: Add a NIR version of the OES_draw_texture built-in
 shaders.
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Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Tested-by: Rob Clark <robdclark@gmail.com>
Tested-by: Eric Anholt <eric@anholt.net>
---
 src/mesa/state_tracker/st_cb_drawtex.c | 69 ++++++++++++++++++++++++++++++----
 1 file changed, 62 insertions(+), 7 deletions(-)

diff --git a/src/mesa/state_tracker/st_cb_drawtex.c b/src/mesa/state_tracker/st_cb_drawtex.c
index b6bf71d..3c583b3 100644
--- a/src/mesa/state_tracker/st_cb_drawtex.c
+++ b/src/mesa/state_tracker/st_cb_drawtex.c
@@ -24,6 +24,7 @@
 #include "st_atom.h"
 #include "st_cb_bitmap.h"
 #include "st_cb_drawtex.h"
+#include "st_nir.h"
 
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
@@ -55,13 +56,46 @@ struct cached_shader
 static struct cached_shader CachedShaders[MAX_SHADERS];
 static GLuint NumCachedShaders = 0;
 
+static gl_vert_attrib
+semantic_to_vert_attrib(unsigned semantic)
+{
+   switch (semantic) {
+   case TGSI_SEMANTIC_POSITION:
+      return VERT_ATTRIB_POS;
+   case TGSI_SEMANTIC_COLOR:
+      return VERT_ATTRIB_COLOR0;
+   case TGSI_SEMANTIC_GENERIC:
+   case TGSI_SEMANTIC_TEXCOORD:
+      return VERT_ATTRIB_GENERIC0;
+   default:
+      unreachable("unhandled semantic");
+   }
+}
+
+static gl_varying_slot
+semantic_to_varying_slot(unsigned semantic)
+{
+   switch (semantic) {
+   case TGSI_SEMANTIC_POSITION:
+      return VARYING_SLOT_POS;
+   case TGSI_SEMANTIC_COLOR:
+      return VARYING_SLOT_COL0;
+   case TGSI_SEMANTIC_GENERIC:
+   case TGSI_SEMANTIC_TEXCOORD:
+      return VARYING_SLOT_TEX0;
+   default:
+      unreachable("unhandled semantic");
+   }
+}
 
 static void *
-lookup_shader(struct pipe_context *pipe,
+lookup_shader(struct st_context *st,
               uint num_attribs,
               const uint *semantic_names,
               const uint *semantic_indexes)
 {
+   struct pipe_context *pipe = st->pipe;
+   struct pipe_screen *screen = pipe->screen;
    GLuint i, j;
 
    /* look for existing shader with same attributes */
@@ -91,11 +125,32 @@ lookup_shader(struct pipe_context *pipe,
       CachedShaders[i].semantic_indexes[j] = semantic_indexes[j];
    }
 
-   CachedShaders[i].handle =
-      util_make_vertex_passthrough_shader(pipe,
-                                          num_attribs,
-                                          semantic_names,
-                                          semantic_indexes, FALSE);
+   enum pipe_shader_ir preferred_ir =
+      screen->get_shader_param(screen, MESA_SHADER_VERTEX,
+                               PIPE_SHADER_CAP_PREFERRED_IR);
+
+   if (preferred_ir == PIPE_SHADER_IR_NIR) {
+      unsigned inputs[2 + MAX_TEXTURE_UNITS];
+      unsigned outputs[2 + MAX_TEXTURE_UNITS];
+
+      for (int j = 0; j < num_attribs; j++) {
+         inputs[j] = semantic_to_vert_attrib(semantic_names[j]);
+         outputs[j] = semantic_to_varying_slot(semantic_names[j]);
+      }
+
+      CachedShaders[i].handle =
+         st_nir_make_passthrough_shader(st, "st/drawtex VS",
+                                        MESA_SHADER_VERTEX,
+                                        num_attribs, inputs,
+                                        outputs, NULL, 0);
+   } else {
+      CachedShaders[i].handle =
+         util_make_vertex_passthrough_shader(pipe,
+                                             num_attribs,
+                                             semantic_names,
+                                             semantic_indexes, FALSE);
+   }
+
    NumCachedShaders++;
 
    return CachedShaders[i].handle;
@@ -243,7 +298,7 @@ st_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
                         CSO_BIT_AUX_VERTEX_BUFFER_SLOT));
 
    {
-      void *vs = lookup_shader(pipe, numAttribs,
+      void *vs = lookup_shader(st, numAttribs,
                                semantic_names, semantic_indexes);
       cso_set_vertex_shader_handle(cso, vs);
    }
-- 
2.7.4