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llvmpipe/interp: refactor out centroid calculations

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These will be reused in the interp instruction code.

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
2020-05-13 06:49:07 +10:00
parent c1f5a23a4d
commit 06c10fa3a5
1 changed files with 39 additions and 30 deletions
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69
src/gallium/drivers/llvmpipe/lp_bld_interp.c
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@@ -151,6 +151,43 @@ calc_offsets(struct lp_build_context *coeff_bld,
}
}
static void
calc_centroid_offsets(struct lp_build_interp_soa_context *bld,
struct gallivm_state *gallivm,
LLVMValueRef loop_iter,
LLVMValueRef mask_store,
LLVMValueRef pix_center_offset,
LLVMValueRef *centroid_x, LLVMValueRef *centroid_y)
{
struct lp_build_context *coeff_bld = &bld->coeff_bld;
LLVMBuilderRef builder = gallivm->builder;
LLVMValueRef s_mask_and = NULL;
LLVMValueRef centroid_x_offset = pix_center_offset;
LLVMValueRef centroid_y_offset = pix_center_offset;
for (int s = bld->coverage_samples - 1; s >= 0; s--) {
LLVMValueRef sample_cov;
LLVMValueRef s_mask_idx = LLVMBuildMul(builder, bld->num_loop, lp_build_const_int32(gallivm, s), "");
s_mask_idx = LLVMBuildAdd(builder, s_mask_idx, loop_iter, "");
sample_cov = lp_build_pointer_get(builder, mask_store, s_mask_idx);
if (s == bld->coverage_samples - 1)
s_mask_and = sample_cov;
else
s_mask_and = LLVMBuildAnd(builder, s_mask_and, sample_cov, "");
LLVMValueRef x_val_idx = lp_build_const_int32(gallivm, s * 2);
LLVMValueRef y_val_idx = lp_build_const_int32(gallivm, s * 2 + 1);
x_val_idx = lp_build_array_get(gallivm, bld->sample_pos_array, x_val_idx);
y_val_idx = lp_build_array_get(gallivm, bld->sample_pos_array, y_val_idx);
x_val_idx = lp_build_broadcast_scalar(coeff_bld, x_val_idx);
y_val_idx = lp_build_broadcast_scalar(coeff_bld, y_val_idx);
centroid_x_offset = lp_build_select(coeff_bld, sample_cov, x_val_idx, centroid_x_offset);
centroid_y_offset = lp_build_select(coeff_bld, sample_cov, y_val_idx, centroid_y_offset);
}
*centroid_x = lp_build_select(coeff_bld, s_mask_and, pix_center_offset, centroid_x_offset);
*centroid_y = lp_build_select(coeff_bld, s_mask_and, pix_center_offset, centroid_y_offset);
}
/* Much easier, and significantly less instructions in the per-stamp
* part (less than half) but overall more instructions so a loss if
@@ -332,36 +369,8 @@ attribs_update_simple(struct lp_build_interp_soa_context *bld,
xoffset = lp_build_broadcast_scalar(coeff_bld, x_val_idx);
yoffset = lp_build_broadcast_scalar(coeff_bld, y_val_idx);
} else if (loc == TGSI_INTERPOLATE_LOC_CENTROID) {
LLVMValueRef centroid_x_offset = pix_center_offset;
LLVMValueRef centroid_y_offset = pix_center_offset;
/* for centroid find covered samples for this quad. */
/* if all samples are covered use pixel centers */
LLVMValueRef s_mask_and = NULL;
for (int s = bld->coverage_samples - 1; s >= 0; s--) {
LLVMValueRef sample_cov;
LLVMValueRef s_mask_idx = LLVMBuildMul(builder, bld->num_loop, lp_build_const_int32(gallivm, s), "");
s_mask_idx = LLVMBuildAdd(builder, s_mask_idx, loop_iter, "");
sample_cov = lp_build_pointer_get(builder, mask_store, s_mask_idx);
if (s == bld->coverage_samples - 1)
s_mask_and = sample_cov;
else
s_mask_and = LLVMBuildAnd(builder, s_mask_and, sample_cov, "");
LLVMValueRef x_val_idx = lp_build_const_int32(gallivm, s * 2);
LLVMValueRef y_val_idx = lp_build_const_int32(gallivm, s * 2 + 1);
x_val_idx = lp_build_array_get(gallivm, bld->sample_pos_array, x_val_idx);
y_val_idx = lp_build_array_get(gallivm, bld->sample_pos_array, y_val_idx);
x_val_idx = lp_build_broadcast_scalar(coeff_bld, x_val_idx);
y_val_idx = lp_build_broadcast_scalar(coeff_bld, y_val_idx);
centroid_x_offset = lp_build_select(coeff_bld, sample_cov, x_val_idx, centroid_x_offset);
centroid_y_offset = lp_build_select(coeff_bld, sample_cov, y_val_idx, centroid_y_offset);
}
xoffset = lp_build_select(coeff_bld, s_mask_and, xoffset, centroid_x_offset);
yoffset = lp_build_select(coeff_bld, s_mask_and, yoffset, centroid_y_offset);
calc_centroid_offsets(bld, gallivm, loop_iter, mask_store,
pix_center_offset, &xoffset, &yoffset);
}
chan_pixoffx = lp_build_add(coeff_bld, chan_pixoffx, xoffset);
chan_pixoffy = lp_build_add(coeff_bld, chan_pixoffy, yoffset);