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i965/vs: Fix texelFetchOffset()

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It appears that when using 'ld' with the offset bits, address bounds
checking happens before the offset is applied, so parts of the drawing
in piglit texelFetchOffset() with a negative texcoord go black.
This commit is contained in:
Eric Anholt 2012-04-17 11:56:26 -07:00
parent f41ecade7b
commit 4650aea7a5
1 changed files with 23 additions and 3 deletions
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26
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
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@ -1838,7 +1838,7 @@ vec4_visitor::visit(ir_texture *ir)
inst->dst = dst_reg(this, ir->type);
inst->shadow_compare = ir->shadow_comparitor != NULL;
if (ir->offset != NULL)
if (ir->offset != NULL && !(intel->gen >= 7 && ir->op == ir_txf))
inst->texture_offset = brw_texture_offset(ir->offset->as_constant());
/* MRF for the first parameter */
@ -1859,8 +1859,28 @@ vec4_visitor::visit(ir_texture *ir)
zero_mask |= (1 << i);
ir->coordinate->accept(this);
emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, coord_mask),
this->result));
if (ir->offset && intel->gen >= 7 && ir->op == ir_txf) {
/* It appears that the ld instruction used for txf does its
* address bounds check before adding in the offset. To work
* around this, just add the integer offset to the integer
* texel coordinate, and don't put the offset in the header.
*/
ir_constant *offset = ir->offset->as_constant();
assert(offset);
for (int j = 0; j < ir->coordinate->type->vector_elements; j++) {
src_reg src = this->result;
src.swizzle = BRW_SWIZZLE4(BRW_GET_SWZ(src.swizzle, j),
BRW_GET_SWZ(src.swizzle, j),
BRW_GET_SWZ(src.swizzle, j),
BRW_GET_SWZ(src.swizzle, j));
emit(ADD(dst_reg(MRF, param_base, ir->coordinate->type, 1 << j),
src, offset->value.i[j]));
}
} else {
emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, coord_mask),
this->result));
}
emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, zero_mask),
src_reg(0)));
/* Load the shadow comparitor */