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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"
LLVMValueRef
lp_build_unpack_rgba(LLVMBuilderRef builder,
enum pipe_format format,
LLVMValueRef ptr)
{
const struct util_format_description *desc;
LLVMTypeRef type;
LLVMValueRef deferred;
unsigned shift = 0;
unsigned i;
desc = util_format_description(format);
/* FIXME: Support more formats */
assert(desc->layout == UTIL_FORMAT_LAYOUT_RGBA);
assert(desc->block.width == 1);
assert(desc->block.height == 1);
assert(desc->block.bits <= 32);
type = LLVMIntType(desc->block.bits);
deferred = LLVMBuildLoad(builder, LLVMBuildBitCast(builder, ptr, LLVMPointerType(type, 0), ""), "");
/* Do the intermediate integer computations with 32bit integers since it
* matches floating point size */
if (desc->block.bits < 32)
deferred = LLVMBuildZExt(builder, deferred, LLVMInt32Type(), "");
/* Broadcast the packed value to all four channels */
deferred = LLVMBuildInsertElement(builder,
LLVMGetUndef(LLVMVectorType(LLVMInt32Type(), 4)),
deferred,
LLVMConstNull(LLVMInt32Type()),
"");
deferred = LLVMBuildShuffleVector(builder,
deferred,
LLVMGetUndef(LLVMVectorType(LLVMInt32Type(), 4)),
LLVMConstNull(LLVMVectorType(LLVMInt32Type(), 4)),
"");
LLVMValueRef shifted, casted, scaled, masked, swizzled;
LLVMValueRef shifts[4];
LLVMValueRef masks[4];
LLVMValueRef scales[4];
bool normalized = FALSE;
int empty_channel = -1;
/* Initialize vector constants */
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());
masks[i] = LLVMConstNull(LLVMInt32Type());
scales[i] = LLVMConstNull(LLVMFloatType());
empty_channel = i;
}
else {
unsigned mask = (1 << bits) - 1;
assert(desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED);
assert(bits < 32);
shifts[i] = LLVMConstInt(LLVMInt32Type(), shift, 0);
masks[i] = LLVMConstInt(LLVMInt32Type(), mask, 0);
if (desc->channel[i].normalized) {
scales[i] = LLVMConstReal(LLVMFloatType(), 1.0/mask);
normalized = TRUE;
}
else
scales[i] = LLVMConstReal(LLVMFloatType(), 1.0);
}
shift += bits;
}
shifted = LLVMBuildLShr(builder, deferred, LLVMConstVector(shifts, 4), "");
masked = LLVMBuildAnd(builder, shifted, LLVMConstVector(masks, 4), "");
// UIToFP can't be expressed in SSE2
casted = LLVMBuildSIToFP(builder, masked, LLVMVectorType(LLVMFloatType(), 4), "");
if (normalized)
scaled = LLVMBuildMul(builder, casted, LLVMConstVector(scales, 4), "");
else
scaled = casted;
LLVMValueRef swizzles[4];
LLVMValueRef aux[4];
for (i = 0; i < 4; ++i)
aux[i] = LLVMGetUndef(LLVMFloatType());
for (i = 0; i < 4; ++i) {
enum util_format_swizzle swizzle = desc->swizzle[i];
switch (swizzle) {
case UTIL_FORMAT_SWIZZLE_X:
case UTIL_FORMAT_SWIZZLE_Y:
case UTIL_FORMAT_SWIZZLE_Z:
case UTIL_FORMAT_SWIZZLE_W:
swizzles[i] = LLVMConstInt(LLVMInt32Type(), swizzle, 0);
break;
case UTIL_FORMAT_SWIZZLE_0:
assert(empty_channel >= 0);
swizzles[i] = LLVMConstInt(LLVMInt32Type(), empty_channel, 0);
break;
case UTIL_FORMAT_SWIZZLE_1:
swizzles[i] = LLVMConstInt(LLVMInt32Type(), 4, 0);
aux[0] = LLVMConstReal(LLVMFloatType(), 1.0);
break;
case UTIL_FORMAT_SWIZZLE_NONE:
swizzles[i] = LLVMGetUndef(LLVMFloatType());
assert(0);
break;
}
}
swizzled = LLVMBuildShuffleVector(builder, scaled, LLVMConstVector(aux, 4), LLVMConstVector(swizzles, 4), "");
return swizzled;
}
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