[Mesa-dev] [PATCH 02/36] i965: Keep track of whether LRI is allowed in the context struct.

[Jordan Justen]

From: Francisco Jerez <currojerez at riseup.net>

This stores the result of can_do_pipelined_register_writes() in the
context struct so we can find out later whether LRI can be used to
program the L3 configuration.
---
 src/mesa/drivers/dri/i965/brw_context.h      | 5 +++++
 src/mesa/drivers/dri/i965/intel_extensions.c | 8 +++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index 4b2db61..20d2dd0 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -840,6 +840,11 @@ struct brw_context
    bool use_resource_streamer;
 
    /**
+    * Whether LRI can be used to write register values from the batch buffer.
+    */
+   bool can_do_pipelined_register_writes;
+
+   /**
     * Some versions of Gen hardware don't do centroid interpolation correctly
     * on unlit pixels, causing incorrect values for derivatives near triangle
     * edges.  Enabling this flag causes the fragment shader to use
diff --git a/src/mesa/drivers/dri/i965/intel_extensions.c b/src/mesa/drivers/dri/i965/intel_extensions.c
index 386b63c..800e97c 100644
--- a/src/mesa/drivers/dri/i965/intel_extensions.c
+++ b/src/mesa/drivers/dri/i965/intel_extensions.c
@@ -40,8 +40,8 @@
 static bool
 can_do_pipelined_register_writes(struct brw_context *brw)
 {
-   /* Supposedly, Broadwell just works. */
-   if (brw->gen >= 8)
+   /* Supposedly Broadwell just works, and earlier gens are sloppy. */
+   if (brw->gen != 7)
       return true;
 
    static int result = -1;
@@ -319,6 +319,8 @@ intelInitExtensions(struct gl_context *ctx)
    }
 
    brw->predicate.supported = false;
+   brw->can_do_pipelined_register_writes =
+      can_do_pipelined_register_writes(brw);
 
    if (brw->gen >= 7) {
       ctx->Extensions.ARB_conservative_depth = true;
@@ -334,7 +336,7 @@ intelInitExtensions(struct gl_context *ctx)
       ctx->Extensions.ARB_texture_view = true;
       ctx->Extensions.ARB_shader_storage_buffer_object = true;
 
-      if (can_do_pipelined_register_writes(brw)) {
+      if (brw->can_do_pipelined_register_writes) {
          ctx->Extensions.ARB_draw_indirect = true;
          ctx->Extensions.ARB_transform_feedback2 = true;
          ctx->Extensions.ARB_transform_feedback3 = true;
-- 
2.6.2