i965: Fix HW binding tables editing

Since the introduction of new gl_shader_stages in

commit a2af956963b6bc4d29f37485e44c98008d2ef077
Author: Fabian Bieler <fabianbieler@fastmail.fm>
Date:   Fri Mar 7 10:19:09 2014 +0100

    mesa: add tessellation shader enums

the translation table for the stage into the HW binding table edit
command was broken, and so we used illegal commands. Fix the array
initialisation to be impervious to changes in the gl_shader_stages enum
and add the asserts that would have caught the issue earlier.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>

diff --git a/src/mesa/drivers/dri/i965/brw_binding_tables.c b/src/mesa/drivers/dri/i965/brw_binding_tables.c
index 8d3697abcd51bf8a10509f864d63aeada20f4aa0..b188fc7de570df868622ef132b21aebcfaf971f0 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_binding_tables.c
+++ b/src/mesa/drivers/dri/i965/brw_binding_tables.c
@@ -44,10 +44,10 @@
 #include "brw_state.h"
 #include "intel_batchbuffer.h"
 
-static const GLuint stage_to_bt_edit[MESA_SHADER_FRAGMENT + 1] = {
-   _3DSTATE_BINDING_TABLE_EDIT_VS,
-   _3DSTATE_BINDING_TABLE_EDIT_GS,
-   _3DSTATE_BINDING_TABLE_EDIT_PS,
+static const GLuint stage_to_bt_edit[] = {
+   [MESA_SHADER_VERTEX] = _3DSTATE_BINDING_TABLE_EDIT_VS,
+   [MESA_SHADER_GEOMETRY] = _3DSTATE_BINDING_TABLE_EDIT_GS,
+   [MESA_SHADER_FRAGMENT] = _3DSTATE_BINDING_TABLE_EDIT_PS,
 };
 
 static uint32_t
@@ -233,7 +233,8 @@ gen7_edit_hw_binding_table_entry(struct brw_context *brw,
                                  uint32_t index,
                                  uint32_t surf_offset)
 {
-   assert(stage <= MESA_SHADER_FRAGMENT);
+   assert(stage < ARRAY_SIZE(stage_to_bt_edit));
+   assert(stage_to_bt_edit[stage]);
 
    uint32_t dw2 = SET_FIELD(index, BRW_BINDING_TABLE_INDEX) |
       (brw->gen >= 8 ? GEN8_SURFACE_STATE_EDIT(surf_offset) :
@@ -259,7 +260,9 @@ gen7_update_binding_table_from_array(struct brw_context *brw,
                                      int num_surfaces)
 {
    uint32_t dw2 = 0;
-   assert(stage <= MESA_SHADER_FRAGMENT);
+
+   assert(stage < ARRAY_SIZE(stage_to_bt_edit));
+   assert(stage_to_bt_edit[stage]);
 
    BEGIN_BATCH(num_surfaces + 2);
    OUT_BATCH(stage_to_bt_edit[stage] << 16 | num_surfaces);