[Mesa-dev] [PATCH 7/7] i965: Stop using wm_prog_data->binding_table.render_target_start.

[Kenneth Graunke]

Render target surfaces always start at binding table index 0.
This is required for us to use headerless FB writes, which we
really want to do.  So, we'll never change that.

Given that, it's not necessary to look up a wm_prog_data field
which we already know contains 0.  We can drop the dependency in
brw_renderbuffer_surfaces (Gen4-5)...which was already confusingly
missing from gen6_renderbuffer_surfaces.
---
 src/intel/compiler/brw_fs_generator.cpp          |  9 +++++++--
 src/mesa/drivers/dri/i965/brw_wm_surface_state.c | 10 +++-------
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/src/intel/compiler/brw_fs_generator.cpp b/src/intel/compiler/brw_fs_generator.cpp
index 2ade486705b..c101c4696ef 100644
--- a/src/intel/compiler/brw_fs_generator.cpp
+++ b/src/intel/compiler/brw_fs_generator.cpp
@@ -277,8 +277,13 @@ fs_generator::fire_fb_write(fs_inst *inst,
    else
       msg_control = BRW_DATAPORT_RENDER_TARGET_WRITE_SIMD8_SINGLE_SOURCE_SUBSPAN01;
 
-   uint32_t surf_index =
-      prog_data->binding_table.render_target_start + inst->target;
+   /* We assume render targets start at 0, because headerless FB write
+    * messages set "Render Target Index" to 0.  Using a different binding
+    * table index would make it impossible to use headerless messages.
+    */
+   assert(prog_data->binding_table.render_target_start == 0);
+
+   uint32_t surf_index = inst->target;
 
    bool last_render_target = inst->eot ||
                              (prog_data->dual_src_blend && dispatch_width == 16);
diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 5cfdbe58102..8c901df8e97 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -990,14 +990,11 @@ update_renderbuffer_surfaces(struct brw_context *brw)
 {
    const struct gl_context *ctx = &brw->ctx;
 
-   /* BRW_NEW_FS_PROG_DATA */
-   const struct brw_wm_prog_data *wm_prog_data =
-      brw_wm_prog_data(brw->wm.base.prog_data);
-
    /* _NEW_BUFFERS | _NEW_COLOR */
    const struct gl_framebuffer *fb = ctx->DrawBuffer;
 
-   const unsigned rt_start = wm_prog_data->binding_table.render_target_start;
+   /* Render targets always start at binding table index 0. */
+   const unsigned rt_start = 0;
 
    uint32_t *surf_offsets = brw->wm.base.surf_offset;
 
@@ -1025,8 +1022,7 @@ const struct brw_tracked_state brw_renderbuffer_surfaces = {
    .dirty = {
       .mesa = _NEW_BUFFERS |
               _NEW_COLOR,
-      .brw = BRW_NEW_BATCH |
-             BRW_NEW_FS_PROG_DATA,
+      .brw = BRW_NEW_BATCH,
    },
    .emit = update_renderbuffer_surfaces,
 };
-- 
2.14.1