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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.
*
**************************************************************************/
#include "util/u_format.h"
#include "lp_bld_type.h"
#include "lp_bld_const.h"
#include "lp_bld_conv.h"
#include "lp_bld_format.h"
/**
* Gather elements from scatter positions in memory into a single vector.
*
* @param src_width src element width
* @param dst_width result element width (source will be expanded to fit)
* @param length length of the offsets,
* @param base_ptr base pointer, should be a i8 pointer type.
* @param offsets vector with offsets
*/
LLVMValueRef
lp_build_gather(LLVMBuilderRef builder,
unsigned length,
unsigned src_width,
unsigned dst_width,
LLVMValueRef base_ptr,
LLVMValueRef offsets)
{
LLVMTypeRef src_type = LLVMIntType(src_width);
LLVMTypeRef src_ptr_type = LLVMPointerType(src_type, 0);
LLVMTypeRef dst_elem_type = LLVMIntType(dst_width);
LLVMTypeRef dst_vec_type = LLVMVectorType(dst_elem_type, length);
LLVMValueRef res;
unsigned i;
res = LLVMGetUndef(dst_vec_type);
for(i = 0; i < length; ++i) {
LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
LLVMValueRef elem_offset;
LLVMValueRef elem_ptr;
LLVMValueRef elem;
elem_offset = LLVMBuildExtractElement(builder, offsets, index, "");
elem_ptr = LLVMBuildGEP(builder, base_ptr, &elem_offset, 1, "");
elem_ptr = LLVMBuildBitCast(builder, elem_ptr, src_ptr_type, "");
elem = LLVMBuildLoad(builder, elem_ptr, "");
assert(src_width <= dst_width);
if(src_width > dst_width)
elem = LLVMBuildTrunc(builder, elem, dst_elem_type, "");
if(src_width < dst_width)
elem = LLVMBuildZExt(builder, elem, dst_elem_type, "");
res = LLVMBuildInsertElement(builder, res, elem, index, "");
}
return res;
}
static LLVMValueRef
lp_build_format_swizzle(struct lp_type type,
const LLVMValueRef *inputs,
enum util_format_swizzle swizzle)
{
switch (swizzle) {
case UTIL_FORMAT_SWIZZLE_X:
case UTIL_FORMAT_SWIZZLE_Y:
case UTIL_FORMAT_SWIZZLE_Z:
case UTIL_FORMAT_SWIZZLE_W:
return inputs[swizzle];
case UTIL_FORMAT_SWIZZLE_0:
return lp_build_zero(type);
case UTIL_FORMAT_SWIZZLE_1:
return lp_build_one(type);
case UTIL_FORMAT_SWIZZLE_NONE:
return lp_build_undef(type);
default:
assert(0);
return lp_build_undef(type);
}
}
void
lp_build_unpack_rgba_soa(LLVMBuilderRef builder,
const struct util_format_description *format_desc,
struct lp_type type,
LLVMValueRef packed,
LLVMValueRef *rgba)
{
LLVMValueRef inputs[4];
unsigned start;
unsigned chan;
/* FIXME: Support more formats */
assert(format_desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
assert(format_desc->block.width == 1);
assert(format_desc->block.height == 1);
assert(format_desc->block.bits <= 32);
/* Decode the input vector components */
start = 0;
for (chan = 0; chan < 4; ++chan) {
unsigned width = format_desc->channel[chan].size;
unsigned stop = start + width;
LLVMValueRef input;
input = packed;
switch(format_desc->channel[chan].type) {
case UTIL_FORMAT_TYPE_VOID:
input = NULL;
break;
case UTIL_FORMAT_TYPE_UNSIGNED:
if(type.floating) {
if(start)
input = LLVMBuildLShr(builder, input, lp_build_int_const_scalar(type, start), "");
if(stop < format_desc->block.bits) {
unsigned mask = ((unsigned long long)1 << width) - 1;
input = LLVMBuildAnd(builder, input, lp_build_int_const_scalar(type, mask), "");
}
if(format_desc->channel[chan].normalized)
input = lp_build_unsigned_norm_to_float(builder, width, type, input);
else
input = LLVMBuildFPToSI(builder, input, lp_build_vec_type(type), "");
}
else {
/* FIXME */
assert(0);
input = lp_build_undef(type);
}
break;
default:
/* fall through */
input = lp_build_undef(type);
break;
}
inputs[chan] = input;
start = stop;
}
if(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
enum util_format_swizzle swizzle = format_desc->swizzle[0];
LLVMValueRef depth = lp_build_format_swizzle(type, inputs, swizzle);
rgba[2] = rgba[1] = rgba[0] = depth;
rgba[3] = lp_build_one(type);
}
else {
for (chan = 0; chan < 4; ++chan) {
enum util_format_swizzle swizzle = format_desc->swizzle[chan];
rgba[chan] = lp_build_format_swizzle(type, inputs, swizzle);
}
}
}
void
lp_build_load_rgba_soa(LLVMBuilderRef builder,
const struct util_format_description *format_desc,
struct lp_type type,
LLVMValueRef base_ptr,
LLVMValueRef offsets,
LLVMValueRef *rgba)
{
LLVMValueRef packed;
assert(format_desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
assert(format_desc->block.width == 1);
assert(format_desc->block.height == 1);
assert(format_desc->block.bits <= 32);
packed = lp_build_gather(builder,
type.length, format_desc->block.bits, type.width,
base_ptr, offsets);
lp_build_unpack_rgba_soa(builder, format_desc, type, packed, rgba);
}
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