llvmpipe: add NV_conditional_render support.

This ports the softpipe NV_conditional_render support to llvmpipe.

This passes the nv_conditional_render-* piglit tests.

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

src/gallium/drivers/llvmpipe/lp_clear.c

@@ -55,6 +55,9 @@ llvmpipe_clear(struct pipe_context *pipe,
    if (llvmpipe->no_rast)
       return;
 
+   if (!llvmpipe_check_render_cond(llvmpipe))
+      return;
+
    if (LP_PERF & PERF_NO_DEPTH)
       buffers &= ~PIPE_CLEAR_DEPTHSTENCIL;
 

src/gallium/drivers/llvmpipe/lp_context.c

@@ -142,6 +142,17 @@ do_flush( struct pipe_context *pipe,
 }
 
 
+static void
+llvmpipe_render_condition ( struct pipe_context *pipe,
+                            struct pipe_query *query,
+                            uint mode )
+{
+   struct llvmpipe_context *llvmpipe = llvmpipe_context( pipe );
+
+   llvmpipe->render_cond_query = query;
+   llvmpipe->render_cond_mode = mode;
+}
+
 struct pipe_context *
 llvmpipe_create_context( struct pipe_screen *screen, void *priv )
 {
@@ -170,6 +181,8 @@ llvmpipe_create_context( struct pipe_screen *screen, void *priv )
    llvmpipe->pipe.clear = llvmpipe_clear;
    llvmpipe->pipe.flush = do_flush;
 
+   llvmpipe->pipe.render_condition = llvmpipe_render_condition;
+
    llvmpipe_init_blend_funcs(llvmpipe);
    llvmpipe_init_clip_funcs(llvmpipe);
    llvmpipe_init_draw_funcs(llvmpipe);

src/gallium/drivers/llvmpipe/lp_context.h

@@ -136,6 +136,10 @@ struct llvmpipe_context {
 
    struct lp_setup_variant_list_item setup_variants_list;
    unsigned nr_setup_variants;
+
+   /** Conditional query object and mode */
+   struct pipe_query *render_cond_query;
+   uint render_cond_mode;
 };
 
 

src/gallium/drivers/llvmpipe/lp_draw_arrays.c

@@ -56,6 +56,9 @@ llvmpipe_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
    void *mapped_indices = NULL;
    unsigned i;
 
+   if (!llvmpipe_check_render_cond(lp))
+      return;
+
    if (lp->dirty)
       llvmpipe_update_derived( lp );
 

src/gallium/drivers/llvmpipe/lp_query.c

@@ -154,6 +154,24 @@ llvmpipe_end_query(struct pipe_context *pipe, struct pipe_query *q)
    llvmpipe->dirty |= LP_NEW_QUERY;
 }
 
+boolean
+llvmpipe_check_render_cond(struct llvmpipe_context *lp)
+{
+   struct pipe_context *pipe = &lp->pipe;
+   boolean b, wait;
+   uint64_t result;
+
+   if (!lp->render_cond_query)
+      return TRUE; /* no query predicate, draw normally */
+   wait = (lp->render_cond_mode == PIPE_RENDER_COND_WAIT ||
+           lp->render_cond_mode == PIPE_RENDER_COND_BY_REGION_WAIT);
+
+   b = pipe->get_query_result(pipe, lp->render_cond_query, wait, &result);
+   if (b)
+      return result > 0;
+   else
+      return TRUE;
+}
 
 void llvmpipe_init_query_funcs(struct llvmpipe_context *llvmpipe )
 {

src/gallium/drivers/llvmpipe/lp_query.h

@@ -49,5 +49,6 @@ struct llvmpipe_query {
 
 extern void llvmpipe_init_query_funcs(struct llvmpipe_context * );
 
+extern boolean llvmpipe_check_render_cond(struct llvmpipe_context *);
 
 #endif /* LP_QUERY_H */

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -157,6 +157,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
+   case PIPE_CAP_CONDITIONAL_RENDER:
       return 1;
    default:
       return 0;