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-rw-r--r--src/gallium/drivers/llvmpipe/lp_bld_depth.c685
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diff --git a/src/gallium/drivers/llvmpipe/lp_bld_depth.c b/src/gallium/drivers/llvmpipe/lp_bld_depth.c
new file mode 100644
index 00000000000..1b59a13c946
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_depth.c
@@ -0,0 +1,685 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Depth/stencil testing to LLVM IR translation.
+ *
+ * To be done accurately/efficiently the depth/stencil test must be done with
+ * the same type/format of the depth/stencil buffer, which implies massaging
+ * the incoming depths to fit into place. Using a more straightforward
+ * type/format for depth/stencil values internally and only convert when
+ * flushing would avoid this, but it would most likely result in depth fighting
+ * artifacts.
+ *
+ * We are free to use a different pixel layout though. Since our basic
+ * processing unit is a quad (2x2 pixel block) we store the depth/stencil
+ * values tiled, a quad at time. That is, a depth buffer containing
+ *
+ * Z11 Z12 Z13 Z14 ...
+ * Z21 Z22 Z23 Z24 ...
+ * Z31 Z32 Z33 Z34 ...
+ * Z41 Z42 Z43 Z44 ...
+ * ... ... ... ... ...
+ *
+ * will actually be stored in memory as
+ *
+ * Z11 Z12 Z21 Z22 Z13 Z14 Z23 Z24 ...
+ * Z31 Z32 Z41 Z42 Z33 Z34 Z43 Z44 ...
+ * ... ... ... ... ... ... ... ... ...
+ *
+ *
+ * Stencil test:
+ * Two-sided stencil test is supported but probably not as efficient as
+ * it could be. Currently, we use if/then/else constructs to do the
+ * operations for front vs. back-facing polygons. We could probably do
+ * both the front and back arithmetic then use a Select() instruction to
+ * choose the result depending on polyon orientation. We'd have to
+ * measure performance both ways and see which is better.
+ *
+ * @author Jose Fonseca <[email protected]>
+ */
+
+#include "pipe/p_state.h"
+#include "util/u_format.h"
+
+#include "gallivm/lp_bld_type.h"
+#include "gallivm/lp_bld_arit.h"
+#include "gallivm/lp_bld_const.h"
+#include "gallivm/lp_bld_logic.h"
+#include "gallivm/lp_bld_flow.h"
+#include "gallivm/lp_bld_debug.h"
+#include "gallivm/lp_bld_swizzle.h"
+
+#include "lp_bld_depth.h"
+
+
+/** Used to select fields from pipe_stencil_state */
+enum stencil_op {
+ S_FAIL_OP,
+ Z_FAIL_OP,
+ Z_PASS_OP
+};
+
+
+
+/**
+ * Do the stencil test comparison (compare FB stencil values against ref value).
+ * This will be used twice when generating two-sided stencil code.
+ * \param stencil the front/back stencil state
+ * \param stencilRef the stencil reference value, replicated as a vector
+ * \param stencilVals vector of stencil values from framebuffer
+ * \return vector mask of pass/fail values (~0 or 0)
+ */
+static LLVMValueRef
+lp_build_stencil_test_single(struct lp_build_context *bld,
+ const struct pipe_stencil_state *stencil,
+ LLVMValueRef stencilRef,
+ LLVMValueRef stencilVals)
+{
+ const unsigned stencilMax = 255; /* XXX fix */
+ struct lp_type type = bld->type;
+ LLVMValueRef res;
+
+ assert(type.sign);
+
+ assert(stencil->enabled);
+
+ if (stencil->valuemask != stencilMax) {
+ /* compute stencilRef = stencilRef & valuemask */
+ LLVMValueRef valuemask = lp_build_const_int_vec(type, stencil->valuemask);
+ stencilRef = LLVMBuildAnd(bld->builder, stencilRef, valuemask, "");
+ /* compute stencilVals = stencilVals & valuemask */
+ stencilVals = LLVMBuildAnd(bld->builder, stencilVals, valuemask, "");
+ }
+
+ res = lp_build_cmp(bld, stencil->func, stencilRef, stencilVals);
+
+ return res;
+}
+
+
+/**
+ * Do the one or two-sided stencil test comparison.
+ * \sa lp_build_stencil_test_single
+ * \param face an integer indicating front (+) or back (-) facing polygon.
+ * If NULL, assume front-facing.
+ */
+static LLVMValueRef
+lp_build_stencil_test(struct lp_build_context *bld,
+ const struct pipe_stencil_state stencil[2],
+ LLVMValueRef stencilRefs[2],
+ LLVMValueRef stencilVals,
+ LLVMValueRef face)
+{
+ LLVMValueRef res;
+
+ assert(stencil[0].enabled);
+
+ if (stencil[1].enabled && face) {
+ /* do two-sided test */
+ struct lp_build_flow_context *flow_ctx;
+ struct lp_build_if_state if_ctx;
+ LLVMValueRef front_facing;
+ LLVMValueRef zero = LLVMConstReal(LLVMFloatType(), 0.0);
+ LLVMValueRef result = bld->undef;
+
+ flow_ctx = lp_build_flow_create(bld->builder);
+ lp_build_flow_scope_begin(flow_ctx);
+
+ lp_build_flow_scope_declare(flow_ctx, &result);
+
+ /* front_facing = face > 0.0 */
+ front_facing = LLVMBuildFCmp(bld->builder, LLVMRealUGT, face, zero, "");
+
+ lp_build_if(&if_ctx, flow_ctx, bld->builder, front_facing);
+ {
+ result = lp_build_stencil_test_single(bld, &stencil[0],
+ stencilRefs[0], stencilVals);
+ }
+ lp_build_else(&if_ctx);
+ {
+ result = lp_build_stencil_test_single(bld, &stencil[1],
+ stencilRefs[1], stencilVals);
+ }
+ lp_build_endif(&if_ctx);
+
+ lp_build_flow_scope_end(flow_ctx);
+ lp_build_flow_destroy(flow_ctx);
+
+ res = result;
+ }
+ else {
+ /* do single-side test */
+ res = lp_build_stencil_test_single(bld, &stencil[0],
+ stencilRefs[0], stencilVals);
+ }
+
+ return res;
+}
+
+
+/**
+ * Apply the stencil operator (add/sub/keep/etc) to the given vector
+ * of stencil values.
+ * \return new stencil values vector
+ */
+static LLVMValueRef
+lp_build_stencil_op_single(struct lp_build_context *bld,
+ const struct pipe_stencil_state *stencil,
+ enum stencil_op op,
+ LLVMValueRef stencilRef,
+ LLVMValueRef stencilVals,
+ LLVMValueRef mask)
+
+{
+ const unsigned stencilMax = 255; /* XXX fix */
+ struct lp_type type = bld->type;
+ LLVMValueRef res;
+ LLVMValueRef max = lp_build_const_int_vec(type, stencilMax);
+ unsigned stencil_op;
+
+ assert(type.sign);
+
+ switch (op) {
+ case S_FAIL_OP:
+ stencil_op = stencil->fail_op;
+ break;
+ case Z_FAIL_OP:
+ stencil_op = stencil->zfail_op;
+ break;
+ case Z_PASS_OP:
+ stencil_op = stencil->zpass_op;
+ break;
+ default:
+ assert(0 && "Invalid stencil_op mode");
+ stencil_op = PIPE_STENCIL_OP_KEEP;
+ }
+
+ switch (stencil_op) {
+ case PIPE_STENCIL_OP_KEEP:
+ res = stencilVals;
+ /* we can return early for this case */
+ return res;
+ case PIPE_STENCIL_OP_ZERO:
+ res = bld->zero;
+ break;
+ case PIPE_STENCIL_OP_REPLACE:
+ res = stencilRef;
+ break;
+ case PIPE_STENCIL_OP_INCR:
+ res = lp_build_add(bld, stencilVals, bld->one);
+ res = lp_build_min(bld, res, max);
+ break;
+ case PIPE_STENCIL_OP_DECR:
+ res = lp_build_sub(bld, stencilVals, bld->one);
+ res = lp_build_max(bld, res, bld->zero);
+ break;
+ case PIPE_STENCIL_OP_INCR_WRAP:
+ res = lp_build_add(bld, stencilVals, bld->one);
+ res = LLVMBuildAnd(bld->builder, res, max, "");
+ break;
+ case PIPE_STENCIL_OP_DECR_WRAP:
+ res = lp_build_sub(bld, stencilVals, bld->one);
+ res = LLVMBuildAnd(bld->builder, res, max, "");
+ break;
+ case PIPE_STENCIL_OP_INVERT:
+ res = LLVMBuildNot(bld->builder, stencilVals, "");
+ res = LLVMBuildAnd(bld->builder, res, max, "");
+ break;
+ default:
+ assert(0 && "bad stencil op mode");
+ res = NULL;
+ }
+
+ if (stencil->writemask != stencilMax) {
+ /* compute res = (res & mask) | (stencilVals & ~mask) */
+ LLVMValueRef mask = lp_build_const_int_vec(type, stencil->writemask);
+ LLVMValueRef cmask = LLVMBuildNot(bld->builder, mask, "notWritemask");
+ LLVMValueRef t1 = LLVMBuildAnd(bld->builder, res, mask, "t1");
+ LLVMValueRef t2 = LLVMBuildAnd(bld->builder, stencilVals, cmask, "t2");
+ res = LLVMBuildOr(bld->builder, t1, t2, "t1_or_t2");
+ }
+
+ /* only the update the vector elements enabled by 'mask' */
+ res = lp_build_select(bld, mask, res, stencilVals);
+
+ return res;
+}
+
+
+/**
+ * Do the one or two-sided stencil test op/update.
+ */
+static LLVMValueRef
+lp_build_stencil_op(struct lp_build_context *bld,
+ const struct pipe_stencil_state stencil[2],
+ enum stencil_op op,
+ LLVMValueRef stencilRefs[2],
+ LLVMValueRef stencilVals,
+ LLVMValueRef mask,
+ LLVMValueRef face)
+
+{
+ assert(stencil[0].enabled);
+
+ if (stencil[1].enabled && face) {
+ /* do two-sided op */
+ struct lp_build_flow_context *flow_ctx;
+ struct lp_build_if_state if_ctx;
+ LLVMValueRef front_facing;
+ LLVMValueRef zero = LLVMConstReal(LLVMFloatType(), 0.0);
+ LLVMValueRef result = bld->undef;
+
+ flow_ctx = lp_build_flow_create(bld->builder);
+ lp_build_flow_scope_begin(flow_ctx);
+
+ lp_build_flow_scope_declare(flow_ctx, &result);
+
+ /* front_facing = face > 0.0 */
+ front_facing = LLVMBuildFCmp(bld->builder, LLVMRealUGT, face, zero, "");
+
+ lp_build_if(&if_ctx, flow_ctx, bld->builder, front_facing);
+ {
+ result = lp_build_stencil_op_single(bld, &stencil[0], op,
+ stencilRefs[0], stencilVals, mask);
+ }
+ lp_build_else(&if_ctx);
+ {
+ result = lp_build_stencil_op_single(bld, &stencil[1], op,
+ stencilRefs[1], stencilVals, mask);
+ }
+ lp_build_endif(&if_ctx);
+
+ lp_build_flow_scope_end(flow_ctx);
+ lp_build_flow_destroy(flow_ctx);
+
+ return result;
+ }
+ else {
+ /* do single-sided op */
+ return lp_build_stencil_op_single(bld, &stencil[0], op,
+ stencilRefs[0], stencilVals, mask);
+ }
+}
+
+
+
+/**
+ * Return a type appropriate for depth/stencil testing.
+ */
+struct lp_type
+lp_depth_type(const struct util_format_description *format_desc,
+ unsigned length)
+{
+ struct lp_type type;
+ unsigned swizzle;
+
+ assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
+ assert(format_desc->block.width == 1);
+ assert(format_desc->block.height == 1);
+
+ swizzle = format_desc->swizzle[0];
+ assert(swizzle < 4);
+
+ memset(&type, 0, sizeof type);
+ type.width = format_desc->block.bits;
+
+ if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_FLOAT) {
+ type.floating = TRUE;
+ assert(swizzle == 0);
+ assert(format_desc->channel[swizzle].size == format_desc->block.bits);
+ }
+ else if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED) {
+ assert(format_desc->block.bits <= 32);
+ if(format_desc->channel[swizzle].normalized)
+ type.norm = TRUE;
+ }
+ else
+ assert(0);
+
+ assert(type.width <= length);
+ type.length = length / type.width;
+
+ return type;
+}
+
+
+/**
+ * Compute bitmask and bit shift to apply to the incoming fragment Z values
+ * and the Z buffer values needed before doing the Z comparison.
+ *
+ * Note that we leave the Z bits in the position that we find them
+ * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us
+ * get by with fewer bit twiddling steps.
+ */
+static boolean
+get_z_shift_and_mask(const struct util_format_description *format_desc,
+ unsigned *shift, unsigned *mask)
+{
+ const unsigned total_bits = format_desc->block.bits;
+ unsigned z_swizzle;
+ unsigned chan;
+ unsigned padding_left, padding_right;
+
+ assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
+ assert(format_desc->block.width == 1);
+ assert(format_desc->block.height == 1);
+
+ z_swizzle = format_desc->swizzle[0];
+
+ if (z_swizzle == UTIL_FORMAT_SWIZZLE_NONE)
+ return FALSE;
+
+ padding_right = 0;
+ for (chan = 0; chan < z_swizzle; ++chan)
+ padding_right += format_desc->channel[chan].size;
+
+ padding_left =
+ total_bits - (padding_right + format_desc->channel[z_swizzle].size);
+
+ if (padding_left || padding_right) {
+ unsigned long long mask_left = (1ULL << (total_bits - padding_left)) - 1;
+ unsigned long long mask_right = (1ULL << (padding_right)) - 1;
+ *mask = mask_left ^ mask_right;
+ }
+ else {
+ *mask = 0xffffffff;
+ }
+
+ *shift = padding_left;
+
+ return TRUE;
+}
+
+
+/**
+ * Compute bitmask and bit shift to apply to the framebuffer pixel values
+ * to put the stencil bits in the least significant position.
+ * (i.e. 0x000000ff)
+ */
+static boolean
+get_s_shift_and_mask(const struct util_format_description *format_desc,
+ unsigned *shift, unsigned *mask)
+{
+ unsigned s_swizzle;
+ unsigned chan, sz;
+
+ s_swizzle = format_desc->swizzle[1];
+
+ if (s_swizzle == UTIL_FORMAT_SWIZZLE_NONE)
+ return FALSE;
+
+ *shift = 0;
+ for (chan = 0; chan < s_swizzle; chan++)
+ *shift += format_desc->channel[chan].size;
+
+ sz = format_desc->channel[s_swizzle].size;
+ *mask = (1U << sz) - 1U;
+
+ return TRUE;
+}
+
+
+
+/**
+ * Generate code for performing depth and/or stencil tests.
+ * We operate on a vector of values (typically a 2x2 quad).
+ *
+ * \param depth the depth test state
+ * \param stencil the front/back stencil state
+ * \param type the data type of the fragment depth/stencil values
+ * \param format_desc description of the depth/stencil surface
+ * \param mask the alive/dead pixel mask for the quad (vector)
+ * \param stencil_refs the front/back stencil ref values (scalar)
+ * \param z_src the incoming depth/stencil values (a 2x2 quad)
+ * \param zs_dst_ptr pointer to depth/stencil values in framebuffer
+ * \param facing contains float value indicating front/back facing polygon
+ */
+void
+lp_build_depth_stencil_test(LLVMBuilderRef builder,
+ const struct pipe_depth_state *depth,
+ const struct pipe_stencil_state stencil[2],
+ struct lp_type type,
+ const struct util_format_description *format_desc,
+ struct lp_build_mask_context *mask,
+ LLVMValueRef stencil_refs[2],
+ LLVMValueRef z_src,
+ LLVMValueRef zs_dst_ptr,
+ LLVMValueRef face)
+{
+ struct lp_build_context bld;
+ struct lp_build_context sbld;
+ struct lp_type s_type;
+ LLVMValueRef zs_dst, z_dst = NULL;
+ LLVMValueRef stencil_vals = NULL;
+ LLVMValueRef z_bitmask = NULL, stencil_shift = NULL;
+ LLVMValueRef z_pass = NULL, s_pass_mask = NULL;
+ LLVMValueRef orig_mask = mask->value;
+
+ /* Sanity checking */
+ {
+ const unsigned z_swizzle = format_desc->swizzle[0];
+ const unsigned s_swizzle = format_desc->swizzle[1];
+
+ assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE ||
+ s_swizzle != UTIL_FORMAT_SWIZZLE_NONE);
+
+ assert(depth->enabled || stencil[0].enabled);
+
+ assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
+ assert(format_desc->block.width == 1);
+ assert(format_desc->block.height == 1);
+
+ if (stencil[0].enabled) {
+ assert(format_desc->format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
+ format_desc->format == PIPE_FORMAT_S8_USCALED_Z24_UNORM);
+ }
+
+ assert(z_swizzle < 4);
+ assert(format_desc->block.bits == type.width);
+ if (type.floating) {
+ assert(z_swizzle == 0);
+ assert(format_desc->channel[z_swizzle].type ==
+ UTIL_FORMAT_TYPE_FLOAT);
+ assert(format_desc->channel[z_swizzle].size ==
+ format_desc->block.bits);
+ }
+ else {
+ assert(format_desc->channel[z_swizzle].type ==
+ UTIL_FORMAT_TYPE_UNSIGNED);
+ assert(format_desc->channel[z_swizzle].normalized);
+ assert(!type.fixed);
+ assert(!type.sign);
+ assert(type.norm);
+ }
+ }
+
+
+ /* Setup build context for Z vals */
+ lp_build_context_init(&bld, builder, type);
+
+ /* Setup build context for stencil vals */
+ s_type = lp_type_int_vec(type.width);
+ lp_build_context_init(&sbld, builder, s_type);
+
+ /* Load current z/stencil value from z/stencil buffer */
+ zs_dst = LLVMBuildLoad(builder, zs_dst_ptr, "");
+
+ lp_build_name(zs_dst, "zsbufval");
+
+
+ /* Compute and apply the Z/stencil bitmasks and shifts.
+ */
+ {
+ unsigned z_shift, z_mask;
+ unsigned s_shift, s_mask;
+
+ if (get_z_shift_and_mask(format_desc, &z_shift, &z_mask)) {
+ if (z_shift) {
+ LLVMValueRef shift = lp_build_const_int_vec(type, z_shift);
+ z_src = LLVMBuildLShr(builder, z_src, shift, "");
+ }
+
+ if (z_mask != 0xffffffff) {
+ LLVMValueRef mask = lp_build_const_int_vec(type, z_mask);
+ z_src = LLVMBuildAnd(builder, z_src, mask, "");
+ z_dst = LLVMBuildAnd(builder, zs_dst, mask, "");
+ z_bitmask = mask; /* used below */
+ }
+ else {
+ z_dst = zs_dst;
+ }
+
+ lp_build_name(z_dst, "zsbuf.z");
+ }
+
+ if (get_s_shift_and_mask(format_desc, &s_shift, &s_mask)) {
+ if (s_shift) {
+ LLVMValueRef shift = lp_build_const_int_vec(type, s_shift);
+ stencil_vals = LLVMBuildLShr(builder, zs_dst, shift, "");
+ stencil_shift = shift; /* used below */
+ }
+ else {
+ stencil_vals = zs_dst;
+ }
+
+ if (s_mask != 0xffffffff) {
+ LLVMValueRef mask = lp_build_const_int_vec(type, s_mask);
+ stencil_vals = LLVMBuildAnd(builder, stencil_vals, mask, "");
+ }
+
+ lp_build_name(stencil_vals, "stencil");
+ }
+ }
+
+
+ if (stencil[0].enabled) {
+ /* convert scalar stencil refs into vectors */
+ stencil_refs[0] = lp_build_broadcast_scalar(&bld, stencil_refs[0]);
+ stencil_refs[1] = lp_build_broadcast_scalar(&bld, stencil_refs[1]);
+
+ s_pass_mask = lp_build_stencil_test(&sbld, stencil,
+ stencil_refs, stencil_vals, face);
+
+ /* apply stencil-fail operator */
+ {
+ LLVMValueRef s_fail_mask = lp_build_andc(&bld, orig_mask, s_pass_mask);
+ stencil_vals = lp_build_stencil_op(&sbld, stencil, S_FAIL_OP,
+ stencil_refs, stencil_vals,
+ s_fail_mask, face);
+ }
+ }
+
+ if (depth->enabled) {
+ /* compare src Z to dst Z, returning 'pass' mask */
+ z_pass = lp_build_cmp(&bld, depth->func, z_src, z_dst);
+
+ if (!stencil[0].enabled) {
+ /* We can potentially skip all remaining operations here, but only
+ * if stencil is disabled because we still need to update the stencil
+ * buffer values. Don't need to update Z buffer values.
+ */
+ lp_build_mask_update(mask, z_pass);
+ }
+
+ if (depth->writemask) {
+ LLVMValueRef zselectmask = mask->value;
+
+ /* mask off bits that failed Z test */
+ zselectmask = LLVMBuildAnd(builder, zselectmask, z_pass, "");
+
+ /* mask off bits that failed stencil test */
+ if (s_pass_mask) {
+ zselectmask = LLVMBuildAnd(builder, zselectmask, s_pass_mask, "");
+ }
+
+ /* if combined Z/stencil format, mask off the stencil bits */
+ if (z_bitmask) {
+ zselectmask = LLVMBuildAnd(builder, zselectmask, z_bitmask, "");
+ }
+
+ /* Mix the old and new Z buffer values.
+ * z_dst[i] = zselectmask[i] ? z_src[i] : z_dst[i]
+ */
+ z_dst = lp_build_select(&bld, zselectmask, z_src, z_dst);
+ }
+
+ if (stencil[0].enabled) {
+ /* update stencil buffer values according to z pass/fail result */
+ LLVMValueRef z_fail_mask, z_pass_mask;
+
+ /* apply Z-fail operator */
+ z_fail_mask = lp_build_andc(&bld, orig_mask, z_pass);
+ stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_FAIL_OP,
+ stencil_refs, stencil_vals,
+ z_fail_mask, face);
+
+ /* apply Z-pass operator */
+ z_pass_mask = LLVMBuildAnd(bld.builder, orig_mask, z_pass, "");
+ stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_PASS_OP,
+ stencil_refs, stencil_vals,
+ z_pass_mask, face);
+ }
+ }
+ else {
+ /* No depth test: apply Z-pass operator to stencil buffer values which
+ * passed the stencil test.
+ */
+ s_pass_mask = LLVMBuildAnd(bld.builder, orig_mask, s_pass_mask, "");
+ stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_PASS_OP,
+ stencil_refs, stencil_vals,
+ s_pass_mask, face);
+ }
+
+ /* The Z bits are already in the right place but we may need to shift the
+ * stencil bits before ORing Z with Stencil to make the final pixel value.
+ */
+ if (stencil_vals && stencil_shift)
+ stencil_vals = LLVMBuildShl(bld.builder, stencil_vals,
+ stencil_shift, "");
+
+ /* Finally, merge/store the z/stencil values */
+ if ((depth->enabled && depth->writemask) ||
+ (stencil[0].enabled && stencil[0].writemask)) {
+
+ if (z_dst && stencil_vals)
+ zs_dst = LLVMBuildOr(bld.builder, z_dst, stencil_vals, "");
+ else if (z_dst)
+ zs_dst = z_dst;
+ else
+ zs_dst = stencil_vals;
+
+ LLVMBuildStore(builder, zs_dst, zs_dst_ptr);
+ }
+
+ if (s_pass_mask)
+ lp_build_mask_update(mask, s_pass_mask);
+
+ if (depth->enabled && stencil[0].enabled)
+ lp_build_mask_update(mask, z_pass);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 08:09:46 +0000