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i965/fs: 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 2012-04-16 18:43:48 -07:00
parent 587c221a29
commit f41ecade7b
1 changed files with 21 additions and 6 deletions
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27
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
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@ -990,8 +990,9 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
int base_mrf = 2;
int reg_width = c->dispatch_width / 8;
bool header_present = false;
int offsets[3];
if (ir->offset) {
if (ir->offset && ir->op != ir_txf) {
/* The offsets set up by the ir_texture visitor are in the
* m1 header, so we can't go headerless.
*/
@ -1054,9 +1055,23 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
mlen += reg_width;
break;
case 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.
*/
if (ir->offset) {
ir_constant *offset = ir->offset->as_constant();
offsets[0] = offset->value.i[0];
offsets[1] = offset->value.i[1];
offsets[2] = offset->value.i[2];
} else {
memset(offsets, 0, sizeof(offsets));
}
/* Unfortunately, the parameters for LD are intermixed: u, lod, v, r. */
emit(BRW_OPCODE_MOV,
fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_D), coordinate);
emit(BRW_OPCODE_ADD,
fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_D), coordinate, offsets[0]);
coordinate.reg_offset++;
mlen += reg_width;
@ -1065,8 +1080,8 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
mlen += reg_width;
for (int i = 1; i < ir->coordinate->type->vector_elements; i++) {
emit(BRW_OPCODE_MOV,
fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_D), coordinate);
emit(BRW_OPCODE_ADD,
fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_D), coordinate, offsets[i]);
coordinate.reg_offset++;
mlen += reg_width;
}
@ -1128,7 +1143,7 @@ fs_visitor::visit(ir_texture *ir)
ir->coordinate->accept(this);
fs_reg coordinate = this->result;
if (ir->offset != NULL) {
if (ir->offset != NULL && !(intel->gen == 7 && ir->op == ir_txf)) {
uint32_t offset_bits = brw_texture_offset(ir->offset->as_constant());
/* Explicitly set up the message header by copying g0 to msg reg m1. */