st/mesa: use a separate VS variant for the draw module

instead of keeping the IR indefinitely in st_vp_variant.

This trivially fixes Selection/Feedback/RasterPos for NIR.

Reviewed-by: Dave Airlie <airlied@redhat.com>

src/mesa/state_tracker/st_draw_feedback.c

@@ -137,16 +137,13 @@ st_feedback_draw_vbo(struct gl_context *ctx,
       vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index, nr_prims);
 
    /* must get these after state validation! */
+   struct st_common_variant_key key;
+   /* We have to use memcpy to make sure that all bits are copied. */
+   memcpy(&key, &st->vp_variant->key, sizeof(key));
+   key.is_draw_shader = true;
+
    vp = (struct st_vertex_program *)st->vp;
-   vp_variant = st->vp_variant;
-
-   struct pipe_shader_state state = {0};
-   state.type = PIPE_SHADER_IR_TGSI;
-   state.tokens = vp_variant->tokens;
-
-   if (!vp_variant->draw_shader) {
-      vp_variant->draw_shader = draw_create_vertex_shader(draw, &state);
-   }
+   vp_variant = st_get_vp_variant(st, st->vp, &key);
 
    /*
     * Set up the draw module's state.
@@ -158,7 +155,7 @@ st_feedback_draw_vbo(struct gl_context *ctx,
    draw_set_viewport_states(draw, 0, 1, &st->state.viewport[0]);
    draw_set_clip_state(draw, &st->state.clip);
    draw_set_rasterizer_state(draw, &st->state.rasterizer, NULL);
-   draw_bind_vertex_shader(draw, vp_variant->draw_shader);
+   draw_bind_vertex_shader(draw, vp_variant->base.driver_shader);
    set_feedback_vertex_format(ctx);
 
    /* Must setup these after state validation! */

src/mesa/state_tracker/st_program.c

@@ -41,6 +41,7 @@
 #include "program/programopt.h"
 
 #include "compiler/nir/nir.h"
+#include "draw/draw_context.h"
 
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
@@ -254,16 +255,6 @@ delete_variant(struct st_context *st, struct st_variant *v, GLenum target)
       }
    }
 
-   if (target == GL_VERTEX_PROGRAM_ARB) {
-      struct st_vp_variant *vpv = (struct st_vp_variant *)v;
-
-      if (vpv->draw_shader)
-         draw_delete_vertex_shader( st->draw, vpv->draw_shader );
-
-      if (vpv->tokens)
-         ureg_free_tokens(vpv->tokens);
-   }
-
    free(v);
 }
 
@@ -656,18 +647,10 @@ st_create_vp_variant(struct st_context *st,
       if (ST_DEBUG & DEBUG_PRINT_IR)
          nir_print_shader(state.ir.nir, stderr);
 
-      vpv->base.driver_shader = pipe->create_vs_state(pipe, &state);
-
-      /* When generating a NIR program, we usually don't have TGSI tokens.
-       * However, we do create them for ARB_vertex_program / fixed-function VS
-       * programs which we may need to use with the draw module for legacy
-       * feedback/select emulation.  If they exist, copy them.
-       *
-       * TODO: Lowering for shader variants is not applied to TGSI when
-       * generating a NIR shader.
-       */
-      if (stvp->state.tokens)
-         vpv->tokens = tgsi_dup_tokens(stvp->state.tokens);
+      if (key->is_draw_shader)
+         vpv->base.driver_shader = draw_create_vertex_shader(st->draw, &state);
+      else
+         vpv->base.driver_shader = pipe->create_vs_state(pipe, &state);
 
       return vpv;
    }
@@ -709,9 +692,11 @@ st_create_vp_variant(struct st_context *st,
    if (ST_DEBUG & DEBUG_PRINT_IR)
       tgsi_dump(state.tokens, 0);
 
-   vpv->base.driver_shader = pipe->create_vs_state(pipe, &state);
-   /* Save this for selection/feedback/rasterpos. */
-   vpv->tokens = state.tokens;
+   if (key->is_draw_shader)
+      vpv->base.driver_shader = draw_create_vertex_shader(st->draw, &state);
+   else
+      vpv->base.driver_shader = pipe->create_vs_state(pipe, &state);
+
    return vpv;
 }
 

src/mesa/state_tracker/st_program.h

@@ -190,6 +190,11 @@ struct st_common_variant_key
 
    /* for user-defined clip-planes */
    uint8_t lower_ucp;
+
+   /* Whether st_variant::driver_shader is for the draw module,
+    * not for the driver.
+    */
+   bool is_draw_shader;
 };
 
 
@@ -206,15 +211,6 @@ struct st_vp_variant
     */
    struct st_common_variant_key key;
 
-   /**
-    * The shader variant saved for the draw module to later emulate
-    * selection/feedback/rasterpos.
-    */
-   const struct tgsi_token *tokens;
-
-   /** For using our private draw module (glRasterPos) */
-   struct draw_vertex_shader *draw_shader;
-
    /** similar to that in st_vertex_program, but with edgeflags info too */
    GLuint num_inputs;