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i965/vs: Add support for textureGather(.., comp) 

- For HSW: Select the channel based on the component selected (swizzle
  is done in HW)
- For IVB: Select the channel based on the swizzle state for the
  component selected. Only apply the RG32F w/a if we actually want
  green -- we're about to flag it regardless of swizzle state.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Chris Forbes 2013-10-05 23:10:04 +13:00
parent 09c6fd450d
commit e8ec2e0344
1 changed files with 11 additions and 7 deletions
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18
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
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@ -2150,7 +2150,8 @@ vec4_visitor::visit(ir_texture *ir)
* emitting anything other than setting up the constant result.
*/
if (ir->op == ir_tg4) {
int swiz = GET_SWZ(key->tex.swizzles[sampler], 0);
ir_constant *chan = ir->lod_info.component->as_constant();
int swiz = GET_SWZ(key->tex.swizzles[sampler], chan->value.i[0]);
if (swiz == SWIZZLE_ZERO || swiz == SWIZZLE_ONE) {
dst_reg result(this, ir->type);
this->result = src_reg(result);
@ -2398,14 +2399,17 @@ vec4_visitor::visit(ir_texture *ir)
uint32_t
vec4_visitor::gather_channel(ir_texture *ir, int sampler)
{
int swiz = GET_SWZ(key->tex.swizzles[sampler], 0 /* red */);
if (key->tex.gather_channel_quirk_mask & (1<<sampler))
return 2; /* gather4 sampler is broken for green channel on RG32F --
* we must ask for blue instead.
*/
ir_constant *chan = ir->lod_info.component->as_constant();
int swiz = GET_SWZ(key->tex.swizzles[sampler], chan->value.i[0]);
switch (swiz) {
case SWIZZLE_X: return 0;
case SWIZZLE_Y: return 1;
case SWIZZLE_Y:
/* gather4 sampler is broken for green channel on RG32F --
* we must ask for blue instead.
*/
if (key->tex.gather_channel_quirk_mask & (1<<sampler))
return 2;
return 1;
case SWIZZLE_Z: return 2;
case SWIZZLE_W: return 3;
default: