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llvmpipe/interp: fix interpolating frag pos for sample shading

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Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5050>
This commit is contained in:
Dave Airlie 2020-04-16 16:10:34 +10:00
parent c9690b7471
commit 6b7e03175d
1 changed files with 11 additions and 2 deletions
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13
src/gallium/drivers/llvmpipe/lp_bld_interp.c
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@ -289,13 +289,22 @@ attribs_update_simple(struct lp_build_interp_soa_context *bld,
case LP_INTERP_LINEAR:
if (attrib == 0 && chan == 0) {
dadx = coeff_bld->one;
if (bld->pos_offset) {
if (sample_id) {
LLVMValueRef x_val_idx = LLVMBuildMul(gallivm->builder, sample_id, lp_build_const_int32(gallivm, 2), "");
x_val_idx = lp_build_array_get(gallivm, bld->sample_pos_array, x_val_idx);
a = lp_build_broadcast_scalar(coeff_bld, x_val_idx);
} else if (bld->pos_offset) {
a = lp_build_const_vec(gallivm, coeff_bld->type, bld->pos_offset);
}
}
else if (attrib == 0 && chan == 1) {
dady = coeff_bld->one;
if (bld->pos_offset) {
if (sample_id) {
LLVMValueRef y_val_idx = LLVMBuildMul(gallivm->builder, sample_id, lp_build_const_int32(gallivm, 2), "");
y_val_idx = LLVMBuildAdd(gallivm->builder, y_val_idx, lp_build_const_int32(gallivm, 1), "");
y_val_idx = lp_build_array_get(gallivm, bld->sample_pos_array, y_val_idx);
a = lp_build_broadcast_scalar(coeff_bld, y_val_idx);
} else if (bld->pos_offset) {
a = lp_build_const_vec(gallivm, coeff_bld->type, bld->pos_offset);
}
}