Mesa (master): draw: limit the number of vertex shader variants kept around

Zack Rusin zack at kemper.freedesktop.org
Fri Jun 25 16:51:15 PDT 2010


Module: Mesa
Branch: master
Commit: 8ebfcf31eb905b7d47e520c04420620ae21bdf4e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8ebfcf31eb905b7d47e520c04420620ae21bdf4e

Author: Zack Rusin <zackr at vmware.com>
Date:   Fri Jun 25 19:31:09 2010 -0400

draw: limit the number of vertex shader variants kept around

we used to create and cache unltimited number of variant, this
change limits the number of variants kept around to a fixed number.
the change is based on a similar patch by Roland for llvmpipe fragment
shaders.

---

 src/gallium/auxiliary/SConscript                   |    3 +-
 src/gallium/auxiliary/draw/draw_llvm.c             |   69 +++++++++++-
 src/gallium/auxiliary/draw/draw_llvm.h             |   97 +++++++++++++---
 src/gallium/auxiliary/draw/draw_private.h          |    3 +
 .../draw/draw_pt_fetch_shade_pipeline_llvm.c       |   82 +++++++-------
 src/gallium/auxiliary/draw/draw_vs.c               |    5 +
 src/gallium/auxiliary/draw/draw_vs.h               |    6 +-
 src/gallium/auxiliary/draw/draw_vs_llvm.c          |  121 ++++++++++++++++++++
 8 files changed, 324 insertions(+), 62 deletions(-)

diff --git a/src/gallium/auxiliary/SConscript b/src/gallium/auxiliary/SConscript
index 6242ab0..1f40057 100644
--- a/src/gallium/auxiliary/SConscript
+++ b/src/gallium/auxiliary/SConscript
@@ -218,7 +218,8 @@ if env['llvm']:
     'gallivm/lp_bld_type.c',
     'draw/draw_llvm.c',
     'draw/draw_pt_fetch_shade_pipeline_llvm.c',
-    'draw/draw_llvm_translate.c'
+    'draw/draw_llvm_translate.c',
+    'draw/draw_vs_llvm.c'
     ]
 
 gallium = env.ConvenienceLibrary(
diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 9117c13..f521669 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -1,3 +1,30 @@
+/**************************************************************************
+ *
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * 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, 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 VMWARE AND/OR ITS 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 "draw_llvm.h"
 
 #include "draw_context.h"
@@ -219,6 +246,9 @@ draw_llvm_create(struct draw_context *draw)
       LLVMDumpModule(llvm->module);
    }
 
+   llvm->nr_variants = 0;
+   make_empty_list(&llvm->vs_variants_list);
+
    return llvm;
 }
 
@@ -231,9 +261,13 @@ draw_llvm_destroy(struct draw_llvm *llvm)
 }
 
 struct draw_llvm_variant *
-draw_llvm_prepare(struct draw_llvm *llvm, int num_inputs)
+draw_llvm_create_variant(struct draw_llvm *llvm, int num_inputs)
 {
    struct draw_llvm_variant *variant = MALLOC(sizeof(struct draw_llvm_variant));
+   struct llvm_vertex_shader *shader =
+      llvm_vertex_shader(llvm->draw->vs.vertex_shader);
+
+   variant->llvm = llvm;
 
    draw_llvm_make_variant_key(llvm, &variant->key);
 
@@ -242,6 +276,12 @@ draw_llvm_prepare(struct draw_llvm *llvm, int num_inputs)
    draw_llvm_generate(llvm, variant);
    draw_llvm_generate_elts(llvm, variant);
 
+   variant->shader = shader;
+   variant->list_item_global.base = variant;
+   variant->list_item_local.base = variant;
+   /*variant->no = */shader->variants_created++;
+   variant->list_item_global.base = variant;
+
    return variant;
 }
 
@@ -897,3 +937,30 @@ draw_llvm_make_variant_key(struct draw_llvm *llvm,
           &llvm->draw->vs.vertex_shader->state,
           sizeof(struct pipe_shader_state));
 }
+
+void
+draw_llvm_destroy_variant(struct draw_llvm_variant *variant)
+{
+   struct draw_llvm *llvm = variant->llvm;
+   struct draw_context *draw = llvm->draw;
+
+   if (variant->function_elts) {
+      if (variant->function_elts)
+         LLVMFreeMachineCodeForFunction(draw->engine,
+                                        variant->function_elts);
+      LLVMDeleteFunction(variant->function_elts);
+   }
+
+   if (variant->function) {
+      if (variant->function)
+         LLVMFreeMachineCodeForFunction(draw->engine,
+                                        variant->function);
+      LLVMDeleteFunction(variant->function);
+   }
+
+   remove_from_list(&variant->list_item_local);
+   variant->shader->variants_cached--;
+   remove_from_list(&variant->list_item_global);
+   llvm->nr_variants--;
+   FREE(variant);
+}
diff --git a/src/gallium/auxiliary/draw/draw_llvm.h b/src/gallium/auxiliary/draw/draw_llvm.h
index 58fee7f..c98d7fb 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.h
+++ b/src/gallium/auxiliary/draw/draw_llvm.h
@@ -1,15 +1,48 @@
+/**************************************************************************
+ *
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * 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, 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 VMWARE AND/OR ITS 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 HAVE_LLVM_H
 #define HAVE_LLVM_H
 
 #include "draw/draw_private.h"
 
+#include "draw/draw_vs.h"
+
 #include "pipe/p_context.h"
+#include "util/u_simple_list.h"
 
 #include <llvm-c/Core.h>
 #include <llvm-c/Analysis.h>
 #include <llvm-c/Target.h>
 #include <llvm-c/ExecutionEngine.h>
 
+struct draw_llvm;
+struct llvm_vertex_shader;
+
 struct draw_jit_texture
 {
    uint32_t width;
@@ -104,11 +137,50 @@ typedef void
                            unsigned stride,
                            struct pipe_vertex_buffer *vertex_buffers);
 
+struct draw_llvm_variant_key
+{
+   struct pipe_vertex_element vertex_element[PIPE_MAX_ATTRIBS];
+   unsigned                   nr_vertex_elements;
+   struct pipe_shader_state   vs;
+};
+
+struct draw_llvm_variant_list_item
+{
+   struct draw_llvm_variant *base;
+   struct draw_llvm_variant_list_item *next, *prev;
+};
+
+struct draw_llvm_variant
+{
+   struct draw_llvm_variant_key key;
+   LLVMValueRef function;
+   LLVMValueRef function_elts;
+   draw_jit_vert_func jit_func;
+   draw_jit_vert_func_elts jit_func_elts;
+
+   struct llvm_vertex_shader *shader;
+
+   struct draw_llvm *llvm;
+   struct draw_llvm_variant_list_item list_item_global;
+   struct draw_llvm_variant_list_item list_item_local;
+};
+
+struct llvm_vertex_shader {
+   struct draw_vertex_shader base;
+
+   struct draw_llvm_variant_list_item variants;
+   unsigned variants_created;
+   unsigned variants_cached;
+};
+
 struct draw_llvm {
    struct draw_context *draw;
 
    struct draw_jit_context jit_context;
 
+   struct draw_llvm_variant_list_item vs_variants_list;
+   int nr_variants;
+
    LLVMModuleRef module;
    LLVMExecutionEngineRef engine;
    LLVMModuleProviderRef provider;
@@ -121,23 +193,12 @@ struct draw_llvm {
    LLVMTypeRef vb_ptr_type;
 };
 
-struct draw_llvm_variant_key
+static struct llvm_vertex_shader *
+llvm_vertex_shader(struct draw_vertex_shader *vs)
 {
-   struct pipe_vertex_element vertex_element[PIPE_MAX_ATTRIBS];
-   unsigned                   nr_vertex_elements;
-   struct pipe_shader_state   vs;
-};
+   return (struct llvm_vertex_shader *)vs;
+}
 
-struct draw_llvm_variant
-{
-   struct draw_llvm_variant_key key;
-   LLVMValueRef function;
-   LLVMValueRef function_elts;
-   draw_jit_vert_func jit_func;
-   draw_jit_vert_func_elts jit_func_elts;
-
-   struct draw_llvm_variant *next;
-};
 
 struct draw_llvm *
 draw_llvm_create(struct draw_context *draw);
@@ -146,7 +207,10 @@ void
 draw_llvm_destroy(struct draw_llvm *llvm);
 
 struct draw_llvm_variant *
-draw_llvm_prepare(struct draw_llvm *llvm, int num_inputs);
+draw_llvm_create_variant(struct draw_llvm *llvm, int num_inputs);
+
+void
+draw_llvm_destroy_variant(struct draw_llvm_variant *variant);
 
 void
 draw_llvm_make_variant_key(struct draw_llvm *llvm,
@@ -156,4 +220,5 @@ LLVMValueRef
 draw_llvm_translate_from(LLVMBuilderRef builder,
                          LLVMValueRef vbuffer,
                          enum pipe_format from_format);
+
 #endif
diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index 4584033..54944a7 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -81,6 +81,9 @@ struct vertex_header {
 #define UNDEFINED_VERTEX_ID 0xffff
 
 
+/* maximum number of shader variants we can cache */
+#define DRAW_MAX_SHADER_VARIANTS 1024
+
 /**
  * Private context for the drawing module.
  */
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
index c7f7639..d33969a 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
@@ -52,9 +52,7 @@ struct llvm_middle_end {
    unsigned opt;
 
    struct draw_llvm *llvm;
-   struct draw_llvm_variant *variants;
    struct draw_llvm_variant *current_variant;
-   int nr_variants;
 };
 
 
@@ -66,9 +64,11 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
 {
    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
    struct draw_context *draw = fpme->draw;
-   struct draw_vertex_shader *vs = draw->vs.vertex_shader;
+   struct llvm_vertex_shader *shader =
+      llvm_vertex_shader(draw->vs.vertex_shader);
    struct draw_llvm_variant_key key;
    struct draw_llvm_variant *variant = NULL;
+   struct draw_llvm_variant_list_item *li;
    unsigned i;
    unsigned instance_id_index = ~0;
 
@@ -80,13 +80,13 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
    /* Add one to num_outputs because the pipeline occasionally tags on
     * an additional texcoord, eg for AA lines.
     */
-   unsigned nr = MAX2( vs->info.num_inputs,
-		       vs->info.num_outputs + 1 );
+   unsigned nr = MAX2( shader->base.info.num_inputs,
+		       shader->base.info.num_outputs + 1 );
 
    /* Scan for instanceID system value.
     */
-   for (i = 0; i < vs->info.num_inputs; i++) {
-      if (vs->info.input_semantic_name[i] == TGSI_SEMANTIC_INSTANCEID) {
+   for (i = 0; i < shader->base.info.num_inputs; i++) {
+      if (shader->base.info.input_semantic_name[i] == TGSI_SEMANTIC_INSTANCEID) {
          instance_id_index = i;
          break;
       }
@@ -130,20 +130,41 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
 
    draw_llvm_make_variant_key(fpme->llvm, &key);
 
-   variant = fpme->variants;
-   while(variant) {
-      if(memcmp(&variant->key, &key, sizeof key) == 0)
+   li = first_elem(&shader->variants);
+   while(!at_end(&shader->variants, li)) {
+      if(memcmp(&li->base->key, &key, sizeof key) == 0) {
+         variant = li->base;
          break;
+      }
+      li = next_elem(li);
+   }
 
-      variant = variant->next;
+   if (variant) {
+      move_to_head(&fpme->llvm->vs_variants_list, &variant->list_item_global);
    }
+   else {
+      unsigned i;
+      if (fpme->llvm->nr_variants >= DRAW_MAX_SHADER_VARIANTS) {
+         /*
+          * XXX: should we flush here ?
+          */
+         for (i = 0; i < DRAW_MAX_SHADER_VARIANTS / 4; i++) {
+            struct draw_llvm_variant_list_item *item =
+               last_elem(&fpme->llvm->vs_variants_list);
+            draw_llvm_destroy_variant(item->base);
+         }
+      }
 
-   if (!variant) {
-      variant = draw_llvm_prepare(fpme->llvm, nr);
-      variant->next = fpme->variants;
-      fpme->variants = variant;
-      ++fpme->nr_variants;
+      variant = draw_llvm_create_variant(fpme->llvm, nr);
+
+      if (variant) {
+         insert_at_head(&shader->variants, &variant->list_item_local);
+         insert_at_head(&fpme->llvm->vs_variants_list, &variant->list_item_global);
+         fpme->llvm->nr_variants++;
+         shader->variants_cached++;
+      }
    }
+
    fpme->current_variant = variant;
 
    /*XXX we only support one constant buffer */
@@ -358,31 +379,7 @@ static void llvm_middle_end_finish( struct draw_pt_middle_end *middle )
 static void llvm_middle_end_destroy( struct draw_pt_middle_end *middle )
 {
    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
-   struct draw_context *draw = fpme->draw;
-   struct draw_llvm_variant *variant = NULL;
-
-   variant = fpme->variants;
-   while(variant) {
-      struct draw_llvm_variant *next = variant->next;
-
-      if (variant->function_elts) {
-         if (variant->function_elts)
-            LLVMFreeMachineCodeForFunction(draw->engine,
-                                           variant->function_elts);
-         LLVMDeleteFunction(variant->function_elts);
-      }
 
-      if (variant->function) {
-         if (variant->function)
-            LLVMFreeMachineCodeForFunction(draw->engine,
-                                           variant->function);
-         LLVMDeleteFunction(variant->function);
-      }
-
-      FREE(variant);
-
-      variant = next;
-   }
    if (fpme->fetch)
       draw_pt_fetch_destroy( fpme->fetch );
 
@@ -402,7 +399,8 @@ static void llvm_middle_end_destroy( struct draw_pt_middle_end *middle )
 }
 
 
-struct draw_pt_middle_end *draw_pt_fetch_pipeline_or_emit_llvm( struct draw_context *draw )
+struct draw_pt_middle_end *
+draw_pt_fetch_pipeline_or_emit_llvm(struct draw_context *draw)
 {
    struct llvm_middle_end *fpme = 0;
 
@@ -442,9 +440,7 @@ struct draw_pt_middle_end *draw_pt_fetch_pipeline_or_emit_llvm( struct draw_cont
    if (!fpme->llvm)
       goto fail;
 
-   fpme->variants = NULL;
    fpme->current_variant = NULL;
-   fpme->nr_variants = 0;
 
    return &fpme->base;
 
diff --git a/src/gallium/auxiliary/draw/draw_vs.c b/src/gallium/auxiliary/draw/draw_vs.c
index b9db886..57ea63f 100644
--- a/src/gallium/auxiliary/draw/draw_vs.c
+++ b/src/gallium/auxiliary/draw/draw_vs.c
@@ -98,6 +98,11 @@ draw_create_vertex_shader(struct draw_context *draw,
       vs = draw_create_vs_ppc( draw, shader );
 #endif
    }
+#if HAVE_LLVM
+   else {
+      vs = draw_create_vs_llvm(draw, shader);
+   }
+#endif
 
    if (!vs) {
       vs = draw_create_vs_exec( draw, shader );
diff --git a/src/gallium/auxiliary/draw/draw_vs.h b/src/gallium/auxiliary/draw/draw_vs.h
index 6c7e94d..a731994 100644
--- a/src/gallium/auxiliary/draw/draw_vs.h
+++ b/src/gallium/auxiliary/draw/draw_vs.h
@@ -165,7 +165,6 @@ draw_create_vs_ppc(struct draw_context *draw,
 		   const struct pipe_shader_state *templ);
 
 
-
 struct draw_vs_varient_key;
 struct draw_vertex_shader;
 
@@ -173,6 +172,11 @@ struct draw_vs_varient *
 draw_vs_create_varient_aos_sse( struct draw_vertex_shader *vs,
                                 const struct draw_vs_varient_key *key );
 
+#if HAVE_LLVM
+struct draw_vertex_shader *
+draw_create_vs_llvm(struct draw_context *draw,
+		    const struct pipe_shader_state *state);
+#endif
 
 
 /********************************************************************************
diff --git a/src/gallium/auxiliary/draw/draw_vs_llvm.c b/src/gallium/auxiliary/draw/draw_vs_llvm.c
new file mode 100644
index 0000000..04f8f7b
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_vs_llvm.c
@@ -0,0 +1,121 @@
+/**************************************************************************
+ *
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * 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, 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 VMWARE AND/OR ITS 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 "util/u_math.h"
+#include "util/u_memory.h"
+#include "pipe/p_shader_tokens.h"
+
+#include "draw_private.h"
+#include "draw_context.h"
+#include "draw_vs.h"
+#include "draw_llvm.h"
+
+#include "tgsi/tgsi_parse.h"
+#include "tgsi/tgsi_scan.h"
+#include "tgsi/tgsi_exec.h"
+
+static void
+vs_llvm_prepare(struct draw_vertex_shader *shader,
+                struct draw_context *draw)
+{
+   /*struct llvm_vertex_shader *evs = llvm_vertex_shader(shader);*/
+}
+
+static void
+vs_llvm_run_linear( struct draw_vertex_shader *shader,
+		    const float (*input)[4],
+		    float (*output)[4],
+                    const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
+		    unsigned count,
+		    unsigned input_stride,
+		    unsigned output_stride )
+{
+   /* we should never get here since the entire pipeline is
+    * generated in draw_pt_fetch_shade_pipeline_llvm.c */
+   debug_assert(0);
+}
+
+
+static void
+vs_llvm_delete( struct draw_vertex_shader *dvs )
+{
+   struct llvm_vertex_shader *shader = llvm_vertex_shader(dvs);
+   struct pipe_fence_handle *fence = NULL;
+   struct draw_llvm_variant_list_item *li;
+   struct pipe_context *pipe = dvs->draw->pipe;
+
+   /*
+    * XXX: This might be not neccessary at all.
+    */
+   pipe->flush(pipe, 0, &fence);
+   if (fence) {
+      pipe->screen->fence_finish(pipe->screen, fence, 0);
+      pipe->screen->fence_reference(pipe->screen, &fence, NULL);
+   }
+
+
+   li = first_elem(&shader->variants);
+   while(!at_end(&shader->variants, li)) {
+      struct draw_llvm_variant_list_item *next = next_elem(li);
+      draw_llvm_destroy_variant(li->base);
+      li = next;
+   }
+
+   assert(shader->variants_cached == 0);
+   FREE((void*) dvs->state.tokens);
+   FREE( dvs );
+}
+
+
+struct draw_vertex_shader *
+draw_create_vs_llvm(struct draw_context *draw,
+		    const struct pipe_shader_state *state)
+{
+   struct llvm_vertex_shader *vs = CALLOC_STRUCT( llvm_vertex_shader );
+
+   if (vs == NULL)
+      return NULL;
+
+   /* we make a private copy of the tokens */
+   vs->base.state.tokens = tgsi_dup_tokens(state->tokens);
+   if (!vs->base.state.tokens) {
+      FREE(vs);
+      return NULL;
+   }
+
+   tgsi_scan_shader(state->tokens, &vs->base.info);
+
+   vs->base.draw = draw;
+   vs->base.prepare = vs_llvm_prepare;
+   vs->base.run_linear = vs_llvm_run_linear;
+   vs->base.delete = vs_llvm_delete;
+   vs->base.create_varient = draw_vs_create_varient_generic;
+
+   make_empty_list(&vs->variants);
+
+   return &vs->base;
+}



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