KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

i965/vs: Do headerless texturing for texelFetchOffset(). 

For texelFetchOffset(), we just add the texel offsets to the coordinate
rather than using the message header's offset fields.  So we don't
actually need a header on Gen5+.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2013-01-21 21:24:34 -08:00
parent 0412864ae8
commit fce9e5d41b
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
View File

@ -1999,8 +1999,10 @@ vec4_visitor::visit(ir_texture *ir)
assert(!"TXB is not valid for vertex shaders.");
}
bool use_texture_offset = ir->offset != NULL && ir->op != ir_txf;
/* Texel offsets go in the message header; Gen4 also requires headers. */
inst->header_present = ir->offset || intel->gen < 5;
inst->header_present = use_texture_offset || intel->gen < 5;
inst->base_mrf = 2;
inst->mlen = inst->header_present + 1; /* always at least one */
inst->sampler = sampler;
@ -2008,7 +2010,7 @@ vec4_visitor::visit(ir_texture *ir)
inst->dst.writemask = WRITEMASK_XYZW;
inst->shadow_compare = ir->shadow_comparitor != NULL;
if (ir->offset != NULL && ir->op != ir_txf)
if (use_texture_offset)
inst->texture_offset = brw_texture_offset(ir->offset->as_constant());
/* MRF for the first parameter */