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/**************************************************************************
*
* 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 ...
* ... ... ... ... ... ... ... ... ...
*
* FIXME: Code generate stencil test
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#include "pipe/p_state.h"
#include "util/u_format.h"
#include "lp_bld_type.h"
#include "lp_bld_const.h"
#include "lp_bld_logic.h"
#include "lp_bld_flow.h"
#include "lp_bld_debug.h"
#include "lp_bld_depth.h"
/**
* 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;
}
/**
* Depth test.
*/
void
lp_build_depth_test(LLVMBuilderRef builder,
const struct pipe_depth_state *state,
struct lp_type type,
const struct util_format_description *format_desc,
struct lp_build_mask_context *mask,
LLVMValueRef src,
LLVMValueRef dst_ptr)
{
struct lp_build_context bld;
unsigned z_swizzle;
LLVMValueRef dst;
LLVMValueRef z_bitmask = NULL;
LLVMValueRef test;
if(!state->enabled)
return;
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;
/* 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);
}
/* Setup build context */
lp_build_context_init(&bld, builder, type);
dst = LLVMBuildLoad(builder, dst_ptr, "");
lp_build_name(dst, "zsbuf");
/* 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);
/* nothing to do */
}
else {
unsigned padding_left;
unsigned padding_right;
unsigned chan;
assert(format_desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
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 = ((unsigned long long)1 << (format_desc->block.bits - padding_left)) - 1;
const unsigned long long mask_right = ((unsigned long long)1 << (padding_right)) - 1;
z_bitmask = lp_build_int_const_scalar(type, mask_left ^ mask_right);
}
if(padding_left)
src = LLVMBuildLShr(builder, src, lp_build_int_const_scalar(type, padding_left), "");
if(padding_right)
src = LLVMBuildAnd(builder, src, z_bitmask, "");
if(padding_left || padding_right)
dst = LLVMBuildAnd(builder, dst, z_bitmask, "");
}
lp_build_name(dst, "zsbuf.z");
test = lp_build_cmp(&bld, state->func, src, dst);
lp_build_mask_update(mask, test);
if(state->writemask) {
if(z_bitmask)
z_bitmask = LLVMBuildAnd(builder, mask->value, z_bitmask, "");
else
z_bitmask = mask->value;
dst = lp_build_select(&bld, z_bitmask, src, dst);
LLVMBuildStore(builder, dst, dst_ptr);
}
}
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