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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.h"
void
lp_build_pack_rgba(LLVMBuilderRef builder,
enum pipe_format format,
LLVMValueRef ptr,
LLVMValueRef rgba)
{
const struct util_format_description *desc;
LLVMTypeRef type;
LLVMValueRef packed = NULL;
unsigned shift = 0;
unsigned i, j;
desc = util_format_description(format);
assert(desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
assert(desc->block.width == 1);
assert(desc->block.height == 1);
type = LLVMIntType(desc->block.bits);
LLVMValueRef swizzles[4];
LLVMValueRef shifted, casted, scaled, unswizzled;
/* Unswizzle the color components into the source vector. */
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j) {
if (desc->swizzle[j] == i)
break;
}
if (j < 4)
swizzles[i] = LLVMConstInt(LLVMInt32Type(), j, 0);
else
swizzles[i] = LLVMGetUndef(LLVMInt32Type());
}
unswizzled = LLVMBuildShuffleVector(builder, rgba,
LLVMGetUndef(LLVMVectorType(LLVMFloatType(), 4)),
LLVMConstVector(swizzles, 4), "");
LLVMValueRef shifts[4];
LLVMValueRef scales[4];
bool normalized = FALSE;
for (i = 0; i < 4; ++i) {
unsigned bits = desc->channel[i].size;
if (desc->channel[i].type == UTIL_FORMAT_TYPE_VOID) {
shifts[i] = LLVMGetUndef(LLVMInt32Type());
scales[i] = LLVMGetUndef(LLVMFloatType());
}
else {
unsigned mask = (1 << bits) - 1;
assert(desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED);
assert(bits < 32);
shifts[i] = LLVMConstInt(LLVMInt32Type(), shift, 0);
if (desc->channel[i].normalized) {
scales[i] = LLVMConstReal(LLVMFloatType(), mask);
normalized = TRUE;
}
else
scales[i] = LLVMConstReal(LLVMFloatType(), 1.0);
}
shift += bits;
}
if (normalized)
scaled = LLVMBuildMul(builder, unswizzled, LLVMConstVector(scales, 4), "");
else
scaled = unswizzled;
casted = LLVMBuildFPToSI(builder, scaled, LLVMVectorType(LLVMInt32Type(), 4), "");
shifted = LLVMBuildShl(builder, casted, LLVMConstVector(shifts, 4), "");
/* Bitwise or all components */
for (i = 0; i < 4; ++i) {
if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED) {
LLVMValueRef component = LLVMBuildExtractElement(builder, shifted, LLVMConstInt(LLVMInt32Type(), i, 0), "");
if (packed)
packed = LLVMBuildOr(builder, packed, component, "");
else
packed = component;
}
}
if (packed) {
if (desc->block.bits < 32)
packed = LLVMBuildTrunc(builder, packed, type, "");
LLVMBuildStore(builder, packed, LLVMBuildBitCast(builder, ptr, LLVMPointerType(type, 0), ""));
}
}
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