draw: don't pretend have_clipdist is per-vertex

This is just for code cleanup, conceptually the have_clipdist really
isn't per-vertex state, so don't put it there (just dependent on the
shader). Even though there wasn't really any overhead associated with
this, we shouldn't store random shader information in the vertex header.

Reviewed-by: Brian Paul <[email protected]
Reviewed-by: Jose Fonseca <[email protected]>

5 files changed, 20 insertions, 18 deletions

diff --git a/src/gallium/auxiliary/draw/draw_cliptest_tmp.h b/src/gallium/auxiliary/draw/draw_cliptest_tmp.h
index 779b2374e20..c26d288525b 100644
--- a/src/gallium/auxiliary/draw/draw_cliptest_tmp.h
+++ b/src/gallium/auxiliary/draw/draw_cliptest_tmp.h
@@ -137,7 +137,6 @@ static boolean TAG(do_cliptest)( struct pt_post_vs *pvs,
                if (have_cd && num_written_clipdistance) {
                   float clipdist;
                   i = plane_idx - 6;
-                  out->have_clipdist = 1;
                   /* first four clip distance in first vector etc. */
                   if (i < 4)
                      clipdist = out->data[cd[0]][i];
diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index ee974243b3e..a66f270dfc6 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -826,7 +826,7 @@ store_aos(struct gallivm_state *gallivm,
  * struct vertex_header {
  *    unsigned clipmask:DRAW_TOTAL_CLIP_PLANES;
  *    unsigned edgeflag:1;
- *    unsigned have_clipdist:1;
+ *    unsigned pad:1;
  *    unsigned vertex_id:16;
  *    [...]
  * }
@@ -838,7 +838,7 @@ store_aos(struct gallivm_state *gallivm,
  * {
  *   return (x >> 16) |              // vertex_id
  *          ((x & 0x3fff) << 18) |   // clipmask
- *          ((x & 0x4000) << 3) |    // have_clipdist
+ *          ((x & 0x4000) << 3) |    // pad
  *          ((x & 0x8000) << 1);     // edgeflag
  * }
  */
@@ -850,19 +850,23 @@ adjust_mask(struct gallivm_state *gallivm,
    LLVMBuilderRef builder = gallivm->builder;
    LLVMValueRef vertex_id;
    LLVMValueRef clipmask;
-   LLVMValueRef have_clipdist;
+   LLVMValueRef pad;
    LLVMValueRef edgeflag;
 
    vertex_id = LLVMBuildLShr(builder, mask, lp_build_const_int32(gallivm, 16), "");
    clipmask  = LLVMBuildAnd(builder, mask, lp_build_const_int32(gallivm, 0x3fff), "");
    clipmask  = LLVMBuildShl(builder, clipmask, lp_build_const_int32(gallivm, 18), "");
-   have_clipdist = LLVMBuildAnd(builder, mask, lp_build_const_int32(gallivm, 0x4000), "");
-   have_clipdist = LLVMBuildShl(builder, have_clipdist, lp_build_const_int32(gallivm, 3), "");
+   if (0) {
+      pad = LLVMBuildAnd(builder, mask, lp_build_const_int32(gallivm, 0x4000), "");
+      pad = LLVMBuildShl(builder, pad, lp_build_const_int32(gallivm, 3), "");
+   }
    edgeflag = LLVMBuildAnd(builder, mask, lp_build_const_int32(gallivm, 0x8000), "");
    edgeflag = LLVMBuildShl(builder, edgeflag, lp_build_const_int32(gallivm, 1), "");
 
    mask = LLVMBuildOr(builder, vertex_id, clipmask, "");
-   mask = LLVMBuildOr(builder, mask, have_clipdist, "");
+   if (0) {
+      mask = LLVMBuildOr(builder, mask, pad, "");
+   }
    mask = LLVMBuildOr(builder, mask, edgeflag, "");
 #endif
    return mask;
@@ -876,8 +880,7 @@ store_aos_array(struct gallivm_state *gallivm,
                 LLVMValueRef* aos,
                 int attrib,
                 int num_outputs,
-                LLVMValueRef clipmask,
-                boolean have_clipdist)
+                LLVMValueRef clipmask)
 {
    LLVMBuilderRef builder = gallivm->builder;
    LLVMValueRef attr_index = lp_build_const_int32(gallivm, attrib);
@@ -908,10 +911,8 @@ store_aos_array(struct gallivm_state *gallivm,
        * code here.  See struct vertex_header in draw_private.h.
        */
       assert(DRAW_TOTAL_CLIP_PLANES==14);
-      /* initialize vertex id:16 = 0xffff, have_clipdist:1 = 0, edgeflag:1 = 1 */
+      /* initialize vertex id:16 = 0xffff, pad:1 = 0, edgeflag:1 = 1 */
       vertex_id_pad_edgeflag = (0xffff << 16) | (1 << DRAW_TOTAL_CLIP_PLANES);
-      if (have_clipdist)
-         vertex_id_pad_edgeflag |= 1 << (DRAW_TOTAL_CLIP_PLANES+1);
       val = lp_build_const_int_vec(gallivm, lp_int_type(soa_type), vertex_id_pad_edgeflag);
       /* OR with the clipmask */
       cliptmp = LLVMBuildOr(builder, val, clipmask, "");
@@ -998,7 +999,7 @@ convert_to_aos(struct gallivm_state *gallivm,
                       aos,
                       attrib,
                       num_outputs,
-                      clipmask, have_clipdist);
+                      clipmask);
    }
 #if DEBUG_STORE
    lp_build_printf(gallivm, "   # storing end\n");
diff --git a/src/gallium/auxiliary/draw/draw_pipe_clip.c b/src/gallium/auxiliary/draw/draw_pipe_clip.c
index ae21be0edcf..f1bda94a16e 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_clip.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_clip.c
@@ -59,6 +59,7 @@ struct clip_stage {
    struct draw_stage stage;      /**< base class */
 
    unsigned pos_attr;
+   boolean have_clipdist;
 
    /* List of the attributes to be constant interpolated. */
    uint num_const_attribs;
@@ -145,7 +146,7 @@ static void interp(const struct clip_stage *clip,
     */
    dst->clipmask = 0;
    dst->edgeflag = 0;        /* will get overwritten later */
-   dst->have_clipdist = in->have_clipdist;
+   dst->pad = 0;
    dst->vertex_id = UNDEFINED_VERTEX_ID;
 
    /* Interpolate the clip-space coords.
@@ -350,7 +351,7 @@ static inline float getclipdist(const struct clip_stage *clipper,
       plane = clipper->plane[plane_idx];
       dp = dot4(vert->pre_clip_pos, plane);
    }
-   else if (vert->have_clipdist) {
+   else if (clipper->have_clipdist) {
       /* pick the correct clipdistance element from the output vectors */
       int _idx = plane_idx - 6;
       int cdi = _idx >= 4;
@@ -782,7 +783,7 @@ find_interp(const struct draw_fragment_shader *fs, int *indexed_interp,
 static void 
 clip_init_state(struct draw_stage *stage)
 {
-   struct clip_stage *clipper = clip_stage( stage );
+   struct clip_stage *clipper = clip_stage(stage);
    const struct draw_context *draw = stage->draw;
    const struct draw_fragment_shader *fs = draw->fs.fragment_shader;
    const struct tgsi_shader_info *info = draw_get_shader_info(draw);
@@ -790,6 +791,7 @@ clip_init_state(struct draw_stage *stage)
    int indexed_interp[2];
 
    clipper->pos_attr = draw_current_shader_position_output(draw);
+   clipper->have_clipdist = draw_current_shader_num_written_clipdistances(draw) > 0;
 
    /* We need to know for each attribute what kind of interpolation is
     * done on it (flat, smooth or noperspective).  But the information
diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index 5584c4a222c..afc357914ea 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -86,7 +86,7 @@ struct draw_vertex_buffer {
 struct vertex_header {
    unsigned clipmask:DRAW_TOTAL_CLIP_PLANES;
    unsigned edgeflag:1;
-   unsigned have_clipdist:1;
+   unsigned pad:1;
    unsigned vertex_id:16;
 
    float clip[4];
diff --git a/src/gallium/auxiliary/draw/draw_pt_post_vs.c b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
index f0d5e0f5656..3a9101a44d0 100644
--- a/src/gallium/auxiliary/draw/draw_pt_post_vs.c
+++ b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
@@ -58,7 +58,7 @@ initialize_vertex_header(struct vertex_header *header)
 {
    header->clipmask = 0;
    header->edgeflag = 1;
-   header->have_clipdist = 0;
+   header->pad = 0;
    header->vertex_id = UNDEFINED_VERTEX_ID;
 }