Mesa (master): i965: Set nr_params to the number of uniform components in the VS/GS path.

[Francisco Jerez]

Module: Mesa
Branch: master
Commit: fd149628e142af769c1c0ec037bc297d8a3e871f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fd149628e142af769c1c0ec037bc297d8a3e871f

Author: Francisco Jerez <currojerez at riseup.net>
Date:   Thu Jan 22 17:08:23 2015 +0200

i965: Set nr_params to the number of uniform components in the VS/GS path.

Both do_vs_prog and do_gs_prog initialize brw_stage_prog_data::nr_params to
the number of uniform *vectors* required by the shader rather than the number
of uniform components, contradicting the comment.  This is inconsistent with
what the state upload code and scalar path expect but it happens to work until
Gen8 because vec4_visitor interprets it as a number of vectors on construction
and later on overwrites its original value with the number of uniform
components referenced by the shader.

Also there's no need to add the number of samplers, they're not actually
passed in as uniforms.

Fixes a memory corruption issue on BDW with SIMD8 VS.

Cc: "10.5" <mesa-stable at lists.freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_gs.c             |    6 +-----
 src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp |    3 ++-
 src/mesa/drivers/dri/i965/brw_vs.c             |   10 +---------
 3 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_gs.c b/src/mesa/drivers/dri/i965/brw_gs.c
index efcff09..45c157a 100644
--- a/src/mesa/drivers/dri/i965/brw_gs.c
+++ b/src/mesa/drivers/dri/i965/brw_gs.c
@@ -69,11 +69,7 @@ do_gs_prog(struct brw_context *brw,
       rzalloc_array(NULL, const gl_constant_value *, param_count);
    c.prog_data.base.base.pull_param =
       rzalloc_array(NULL, const gl_constant_value *, param_count);
-   /* Setting nr_params here NOT to the size of the param and pull_param
-    * arrays, but to the number of uniform components vec4_visitor
-    * needs. vec4_visitor::setup_uniforms() will set it back to a proper value.
-    */
-   c.prog_data.base.base.nr_params = ALIGN(param_count, 4) / 4 + gs->num_samplers;
+   c.prog_data.base.base.nr_params = param_count;
 
    if (brw->gen >= 7) {
       if (gp->program.OutputType == GL_POINTS) {
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index d5c6e9b..05bda43 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -3671,7 +3671,8 @@ vec4_visitor::vec4_visitor(struct brw_context *brw,
     */
    this->uniform_array_size = 1;
    if (prog_data) {
-      this->uniform_array_size = MAX2(stage_prog_data->nr_params, 1);
+      this->uniform_array_size =
+         MAX2(DIV_ROUND_UP(stage_prog_data->nr_params, 4), 1);
    }
 
    this->uniform_size = rzalloc_array(mem_ctx, int, this->uniform_array_size);
diff --git a/src/mesa/drivers/dri/i965/brw_vs.c b/src/mesa/drivers/dri/i965/brw_vs.c
index 2aefd35..ba2c23d 100644
--- a/src/mesa/drivers/dri/i965/brw_vs.c
+++ b/src/mesa/drivers/dri/i965/brw_vs.c
@@ -241,15 +241,7 @@ do_vs_prog(struct brw_context *brw,
       rzalloc_array(NULL, const gl_constant_value *, param_count);
    stage_prog_data->pull_param =
       rzalloc_array(NULL, const gl_constant_value *, param_count);
-
-   /* Setting nr_params here NOT to the size of the param and pull_param
-    * arrays, but to the number of uniform components vec4_visitor
-    * needs. vec4_visitor::setup_uniforms() will set it back to a proper value.
-    */
-   stage_prog_data->nr_params = ALIGN(param_count, 4) / 4;
-   if (vs) {
-      stage_prog_data->nr_params += vs->num_samplers;
-   }
+   stage_prog_data->nr_params = param_count;
 
    GLbitfield64 outputs_written = vp->program.Base.OutputsWritten;
    prog_data.inputs_read = vp->program.Base.InputsRead;