stencilVals = LLVMBuildAnd(bld->builder, stencilVals, valuemask, "");
}
- res = lp_build_cmp(bld, stencil->func, stencilVals, stencilRef);
+ res = lp_build_cmp(bld, stencil->func, stencilRef, stencilVals);
return res;
}
}
+/**
+ * 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;
+ int 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;
+ int 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).
struct lp_build_context bld;
struct lp_build_context sbld;
struct lp_type s_type;
- unsigned z_swizzle, s_swizzle;
LLVMValueRef zs_dst, z_dst = NULL;
LLVMValueRef stencil_vals = NULL;
- LLVMValueRef z_bitmask = NULL, s_bitmask = NULL, s_shift = NULL;
+ LLVMValueRef z_bitmask = NULL, stencil_shift = NULL;
LLVMValueRef z_pass = NULL, s_pass_mask = NULL;
LLVMValueRef orig_mask = mask->value;
- assert(depth->enabled || stencil[0].enabled);
+ /* Sanity checking */
+ {
+ const unsigned z_swizzle = format_desc->swizzle[0];
+ const unsigned s_swizzle = format_desc->swizzle[1];
- assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
- assert(format_desc->block.width == 1);
- assert(format_desc->block.height == 1);
+ assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE ||
+ s_swizzle != UTIL_FORMAT_SWIZZLE_NONE);
- z_swizzle = format_desc->swizzle[0];
- s_swizzle = format_desc->swizzle[1];
+ assert(depth->enabled || stencil[0].enabled);
- assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE ||
- s_swizzle != UTIL_FORMAT_SWIZZLE_NONE);
+ 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_Z24S8_UNORM ||
- format_desc->format == PIPE_FORMAT_S8Z24_UNORM);
- }
+ if (stencil[0].enabled) {
+ assert(format_desc->format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
+ format_desc->format == PIPE_FORMAT_S8_USCALED_Z24_UNORM);
+ }
- /* Sanity checking */
- 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);
+ 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);
lp_build_name(zs_dst, "zsbufval");
- /* Align the source depth bits with the destination's, and mask out any
- * stencil or padding bits from both */
- if(format_desc->channel[z_swizzle].size == format_desc->block.bits) {
- assert(z_swizzle == 0);
- z_dst = zs_dst;
- }
- else {
- /* shift/mask bits to right-justify the Z bits */
- unsigned padding_left;
- unsigned padding_right;
- unsigned chan;
-
- assert(format_desc->layout == UTIL_FORMAT_LAYOUT_PLAIN);
- assert(format_desc->channel[z_swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED);
- assert(format_desc->channel[z_swizzle].size <= format_desc->block.bits);
- assert(format_desc->channel[z_swizzle].normalized);
-
- padding_right = 0;
- for(chan = 0; chan < z_swizzle; ++chan)
- padding_right += format_desc->channel[chan].size;
- padding_left = format_desc->block.bits -
- (padding_right + format_desc->channel[z_swizzle].size);
-
- if(padding_left || padding_right) {
- const unsigned long long mask_left = (1ULL << (format_desc->block.bits - padding_left)) - 1;
- const unsigned long long mask_right = (1ULL << (padding_right)) - 1;
- z_bitmask = lp_build_const_int_vec(type, mask_left ^ mask_right);
- }
- /* If PIPE_FORMAT_Z24S8, we'll shift zs >> 24 to position stencil_vals */
- if (format_desc->format == PIPE_FORMAT_Z24S8_UNORM)
- s_shift = lp_build_const_int_vec(type, 24);
- else
- s_shift = lp_build_const_int_vec(type, 0);
-
- s_bitmask = lp_build_const_int_vec(s_type, 0xff);
-
- stencil_vals = LLVMBuildLShr(builder, zs_dst, s_shift, "");
- stencil_vals = LLVMBuildAnd(builder, stencil_vals, s_bitmask, "");
+ /* 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(padding_left)
- z_src = LLVMBuildLShr(builder, z_src,
- lp_build_const_int_vec(type, padding_left), "");
- if(padding_right)
- z_src = LLVMBuildAnd(builder, z_src, z_bitmask, "");
- if(padding_left || padding_right)
- z_dst = LLVMBuildAnd(builder, zs_dst, z_bitmask, "");
- else
- z_dst = zs_dst;
+ 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");
+ }
}
- lp_build_name(z_dst, "zsbuf.z");
-
- /*
- printf("build depth %d stencil %d\n",
- depth->enabled,
- stencil[0].enabled);
- */
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);
* 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);
+ stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_PASS_OP,
+ stencil_refs, stencil_vals,
+ s_pass_mask, face);
}
- if (stencil_vals)
- stencil_vals = LLVMBuildShl(bld.builder, stencil_vals, s_shift, "");
+ /* 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) ||
projects / mesa.git / blobdiff