i965: Make brw_compute_vue_map's userclip dependency a boolean.

Previously, brw_compute_vue_map required an argument indicating the
number of clip planes in use, but all it did with it was check if it
was nonzero.

This patch changes brw_compute_vue_map to take a boolean instead.
This allows us to avoid some unnecessary recompilation of the Gen4/5
GS and SF threads.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

13 files changed, 32 insertions, 25 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_clip.c b/src/mesa/drivers/dri/i965/brw_clip.c
index 2dcf9e5df2d..ec851b743f4 100644
--- a/src/mesa/drivers/dri/i965/brw_clip.c
+++ b/src/mesa/drivers/dri/i965/brw_clip.c
@@ -69,7 +69,7 @@ static void compile_clip_prog( struct brw_context *brw,
    c.func.single_program_flow = 1;
 
    c.key = *key;
-   brw_compute_vue_map(&c.vue_map, intel, c.key.nr_userclip, c.key.attrs);
+   brw_compute_vue_map(&c.vue_map, intel, c.key.nr_userclip > 0, c.key.attrs);
 
    /* nr_regs is the number of registers filled by reading data from the VUE.
     * This program accesses the entire VUE, so nr_regs needs to be the size of
diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index e26437fa448..b335954e9a9 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -965,7 +965,8 @@ int brw_disasm (FILE *file, struct brw_instruction *inst, int gen);
 
 /* brw_vs.c */
 void brw_compute_vue_map(struct brw_vue_map *vue_map,
-                         const struct intel_context *intel, int nr_userclip,
+                         const struct intel_context *intel,
+                         bool userclip_active,
                          GLbitfield64 outputs_written);
 gl_clip_plane *brw_select_clip_planes(struct gl_context *ctx);
 
diff --git a/src/mesa/drivers/dri/i965/brw_gs.c b/src/mesa/drivers/dri/i965/brw_gs.c
index b7304b97134..3b56aae821b 100644
--- a/src/mesa/drivers/dri/i965/brw_gs.c
+++ b/src/mesa/drivers/dri/i965/brw_gs.c
@@ -64,7 +64,7 @@ static void compile_gs_prog( struct brw_context *brw,
    c.key = *key;
    /* The geometry shader needs to access the entire VUE. */
    struct brw_vue_map vue_map;
-   brw_compute_vue_map(&vue_map, intel, c.key.nr_userclip, c.key.attrs);
+   brw_compute_vue_map(&vue_map, intel, c.key.userclip_active, c.key.attrs);
    c.nr_regs = (vue_map.num_slots + 1)/2;
 
    mem_ctx = NULL;
@@ -159,7 +159,7 @@ static void populate_key( struct brw_context *brw,
    }
 
    /* _NEW_TRANSFORM */
-   key->nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
+   key->userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 
    key->need_gs_prog = (intel->gen >= 6)
       ? 0
diff --git a/src/mesa/drivers/dri/i965/brw_gs.h b/src/mesa/drivers/dri/i965/brw_gs.h
index d8637c8bb25..cee7467628b 100644
--- a/src/mesa/drivers/dri/i965/brw_gs.h
+++ b/src/mesa/drivers/dri/i965/brw_gs.h
@@ -44,8 +44,7 @@ struct brw_gs_prog_key {
    GLuint primitive:4;
    GLuint pv_first:1;
    GLuint need_gs_prog:1;
-   GLuint nr_userclip:4;
-   GLuint pad:22;
+   GLuint userclip_active:1;
 };
 
 struct brw_gs_compile {
diff --git a/src/mesa/drivers/dri/i965/brw_sf.c b/src/mesa/drivers/dri/i965/brw_sf.c
index f4a6f54d1e3..7a0cd924ff1 100644
--- a/src/mesa/drivers/dri/i965/brw_sf.c
+++ b/src/mesa/drivers/dri/i965/brw_sf.c
@@ -63,7 +63,7 @@ static void compile_sf_prog( struct brw_context *brw,
    brw_init_compile(brw, &c.func, mem_ctx);
 
    c.key = *key;
-   brw_compute_vue_map(&c.vue_map, intel, c.key.nr_userclip, c.key.attrs);
+   brw_compute_vue_map(&c.vue_map, intel, c.key.userclip_active, c.key.attrs);
    c.urb_entry_read_offset = brw_sf_compute_urb_entry_read_offset(intel);
    c.nr_attr_regs = (c.vue_map.num_slots + 1)/2 - c.urb_entry_read_offset;
    c.nr_setup_regs = c.nr_attr_regs;
@@ -154,7 +154,7 @@ static void upload_sf_prog(struct brw_context *brw)
    }
 
    /* _NEW_TRANSFORM */
-   key.nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
+   key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 
    /* _NEW_POINT */
    key.do_point_sprite = ctx->Point.PointSprite;
diff --git a/src/mesa/drivers/dri/i965/brw_sf.h b/src/mesa/drivers/dri/i965/brw_sf.h
index f39ad27154d..8de5f5a3489 100644
--- a/src/mesa/drivers/dri/i965/brw_sf.h
+++ b/src/mesa/drivers/dri/i965/brw_sf.h
@@ -53,8 +53,7 @@ struct brw_sf_prog_key {
    GLuint frontface_ccw:1;
    GLuint do_point_sprite:1;
    GLuint sprite_origin_lower_left:1;
-   GLuint nr_userclip:4;
-   GLuint pad:20;
+   GLuint userclip_active:1;
 };
 
 struct brw_sf_compile {
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
index 5cbbda818cd..ccbad2527f8 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
@@ -595,7 +595,7 @@ vec4_visitor::generate_vs_instruction(vec4_instruction *instruction,
 bool
 vec4_visitor::run()
 {
-   if (c->key.nr_userclip && !c->key.uses_clip_distance)
+   if (c->key.userclip_active && !c->key.uses_clip_distance)
       setup_uniform_clipplane_values();
 
    /* Generate VS IR for main().  (the visitor only descends into
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index f99dc51682b..71053060cbc 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -1790,7 +1790,7 @@ vec4_visitor::emit_psiz_and_flags(struct brw_reg reg)
 {
    if (intel->gen < 6 &&
        ((c->prog_data.outputs_written & BITFIELD64_BIT(VERT_RESULT_PSIZ)) ||
-        c->key.nr_userclip || brw->has_negative_rhw_bug)) {
+        c->key.userclip_active || brw->has_negative_rhw_bug)) {
       dst_reg header1 = dst_reg(this, glsl_type::uvec4_type);
       dst_reg header1_w = header1;
       header1_w.writemask = WRITEMASK_W;
@@ -1996,7 +1996,7 @@ vec4_visitor::emit_urb_writes()
 
    /* FINISHME: edgeflag */
 
-   brw_compute_vue_map(&c->vue_map, intel, c->key.nr_userclip,
+   brw_compute_vue_map(&c->vue_map, intel, c->key.userclip_active,
                        c->prog_data.outputs_written);
 
    /* First mrf is the g0-based message header containing URB handles and such,
diff --git a/src/mesa/drivers/dri/i965/brw_vs.c b/src/mesa/drivers/dri/i965/brw_vs.c
index eb673e29c96..e01752cdb71 100644
--- a/src/mesa/drivers/dri/i965/brw_vs.c
+++ b/src/mesa/drivers/dri/i965/brw_vs.c
@@ -55,7 +55,8 @@ static inline void assign_vue_slot(struct brw_vue_map *vue_map,
  */
 void
 brw_compute_vue_map(struct brw_vue_map *vue_map,
-                    const struct intel_context *intel, int nr_userclip,
+                    const struct intel_context *intel,
+                    bool userclip_active,
                     GLbitfield64 outputs_written)
 {
    int i;
@@ -112,7 +113,7 @@ brw_compute_vue_map(struct brw_vue_map *vue_map,
        */
       assign_vue_slot(vue_map, VERT_RESULT_PSIZ);
       assign_vue_slot(vue_map, VERT_RESULT_HPOS);
-      if (nr_userclip) {
+      if (userclip_active) {
          assign_vue_slot(vue_map, VERT_RESULT_CLIP_DIST0);
          assign_vue_slot(vue_map, VERT_RESULT_CLIP_DIST1);
       }
@@ -287,6 +288,7 @@ static void brw_upload_vs_prog(struct brw_context *brw)
     * the inputs it asks for, whether they are varying or not.
     */
    key.program_string_id = vp->id;
+   key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
    key.nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
    key.uses_clip_distance = vp->program.UsesClipDistance;
    if (!key.uses_clip_distance)
diff --git a/src/mesa/drivers/dri/i965/brw_vs.h b/src/mesa/drivers/dri/i965/brw_vs.h
index a12b1390aad..bd81764cb99 100644
--- a/src/mesa/drivers/dri/i965/brw_vs.h
+++ b/src/mesa/drivers/dri/i965/brw_vs.h
@@ -47,6 +47,12 @@ struct brw_vs_prog_key {
    uint8_t gl_fixed_input_size[VERT_ATTRIB_MAX];
 
    /**
+    * True if at least one clip flag is enabled, regardless of whether the
+    * shader uses clip planes or gl_ClipDistance.
+    */
+   GLuint userclip_active:1;
+
+   /**
     * Number of user clip planes (or clip distances) that are active.
     */
    GLuint nr_userclip:4;
diff --git a/src/mesa/drivers/dri/i965/brw_vs_emit.c b/src/mesa/drivers/dri/i965/brw_vs_emit.c
index 4f7a4422d76..e78cb6c60d4 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -202,7 +202,7 @@ static void brw_vs_alloc_regs( struct brw_vs_compile *c )
 
    /* User clip planes from curbe: 
     */
-   if (c->key.nr_userclip) {
+   if (c->key.userclip_active) {
       if (intel->gen >= 6) {
 	 for (i = 0; i < c->key.nr_userclip; i++) {
 	    c->userplane[i] = stride(brw_vec4_grf(reg + i / 2,
@@ -325,7 +325,7 @@ static void brw_vs_alloc_regs( struct brw_vs_compile *c )
 
    /* Allocate outputs.  The non-position outputs go straight into message regs.
     */
-   brw_compute_vue_map(&c->vue_map, intel, c->key.nr_userclip,
+   brw_compute_vue_map(&c->vue_map, intel, c->key.userclip_active,
                        c->prog_data.outputs_written);
    c->first_output = reg;
 
@@ -1564,7 +1564,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
       }
 
       /* Set the user clip distances in dword 8-15. (m3-4)*/
-      if (c->key.nr_userclip) {
+      if (c->key.userclip_active) {
 	 for (i = 0; i < c->key.nr_userclip; i++) {
 	    struct brw_reg m;
 	    if (i < 4)
@@ -1577,7 +1577,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
       }
    } else if ((c->prog_data.outputs_written &
 	       BITFIELD64_BIT(VERT_RESULT_PSIZ)) ||
-	      c->key.nr_userclip || brw->has_negative_rhw_bug) {
+	      c->key.userclip_active || brw->has_negative_rhw_bug) {
       struct brw_reg header1 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD);
       GLuint i;
 
@@ -1649,7 +1649,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
        */
       brw_MOV(p, brw_message_reg(2), pos);
       len_vertex_header = 1;
-      if (c->key.nr_userclip > 0)
+      if (c->key.userclip_active)
 	 len_vertex_header += 2;
    } else if (intel->gen == 5) {
       /* There are 20 DWs (D0-D19) in VUE header on Ironlake:
diff --git a/src/mesa/drivers/dri/i965/gen6_sf_state.c b/src/mesa/drivers/dri/i965/gen6_sf_state.c
index 306a6c6f2ec..d65bfda6c00 100644
--- a/src/mesa/drivers/dri/i965/gen6_sf_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_sf_state.c
@@ -126,12 +126,12 @@ upload_sf_state(struct brw_context *brw)
    int urb_entry_read_offset = 1;
    float point_size;
    uint16_t attr_overrides[FRAG_ATTRIB_MAX];
-   int nr_userclip;
+   bool userclip_active;
 
    /* _NEW_TRANSFORM */
-   nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
+   userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 
-   brw_compute_vue_map(&vue_map, intel, nr_userclip, vs_outputs_written);
+   brw_compute_vue_map(&vue_map, intel, userclip_active, vs_outputs_written);
    urb_entry_read_length = (vue_map.num_slots + 1)/2 - urb_entry_read_offset;
    if (urb_entry_read_length == 0) {
       /* Setting the URB entry read length to 0 causes undefined behavior, so
diff --git a/src/mesa/drivers/dri/i965/gen7_sf_state.c b/src/mesa/drivers/dri/i965/gen7_sf_state.c
index c40abe4d4bc..e796a01b74d 100644
--- a/src/mesa/drivers/dri/i965/gen7_sf_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_sf_state.c
@@ -44,10 +44,10 @@ upload_sbe_state(struct brw_context *brw)
    int attr = 0, input_index = 0;
    /* _NEW_TRANSFORM */
    int urb_entry_read_offset = 1;
-   int nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
+   bool userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
    uint16_t attr_overrides[FRAG_ATTRIB_MAX];
 
-   brw_compute_vue_map(&vue_map, intel, nr_userclip, vs_outputs_written);
+   brw_compute_vue_map(&vue_map, intel, userclip_active, vs_outputs_written);
    urb_entry_read_length = (vue_map.num_slots + 1)/2 - urb_entry_read_offset;
    if (urb_entry_read_length == 0) {
       /* Setting the URB entry read length to 0 causes undefined behavior, so