/**
* Unpack several pixels in SoA.
*
* It takes a vector of packed pixels:
*
* packed = {P0, P1, P2, P3, ..., Pn}
*
* And will produce four vectors:
*
* red = {R0, R1, R2, R3, ..., Rn}
* green = {G0, G1, G2, G3, ..., Gn}
* blue = {B0, B1, B2, B3, ..., Bn}
* alpha = {A0, A1, A2, A3, ..., An}
*
* It requires that a packed pixel fits into an element of the output
* channels. The common case is when converting pixel with a depth of 32 bit or
* less into floats.
*
* \param format_desc the format of the 'packed' incoming pixel vector
* \param type the desired type for rgba_out (type.length = n, above)
* \param packed the incoming vector of packed pixels
* \param rgba_out returns the SoA R,G,B,A vectors
*/
void
lp_build_unpack_rgba_soa(struct gallivm_state *gallivm,
const struct util_format_description *format_desc,
struct lp_type type,
LLVMValueRef packed,
LLVMValueRef rgba_out[4])
{
LLVMBuilderRef builder = gallivm->builder;
struct lp_build_context bld;
LLVMValueRef inputs[4];
unsigned chan;
assert(format_desc->layout == UTIL_FORMAT_LAYOUT_PLAIN);
assert(format_desc->block.width == 1);
assert(format_desc->block.height == 1);
assert(format_desc->block.bits <= type.width);
/* FIXME: Support more output types */
assert(type.width == 32);
lp_build_context_init(&bld, gallivm, type);
/* Decode the input vector components */
for (chan = 0; chan < format_desc->nr_channels; ++chan) {
const unsigned width = format_desc->channel[chan].size;
const unsigned start = format_desc->channel[chan].shift;
const unsigned stop = start + width;
LLVMValueRef input;
input = packed;
switch(format_desc->channel[chan].type) {
case UTIL_FORMAT_TYPE_VOID:
input = lp_build_undef(gallivm, type);
break;
case UTIL_FORMAT_TYPE_UNSIGNED:
/*
* Align the LSB
*/
if (start) {
input = LLVMBuildLShr(builder, input, lp_build_const_int_vec(gallivm, type, start), "");
}
/*
* Zero the MSBs
*/
if (stop < format_desc->block.bits) {
unsigned mask = ((unsigned long long)1 << width) - 1;
input = LLVMBuildAnd(builder, input, lp_build_const_int_vec(gallivm, type, mask), "");
}
/*
* Type conversion
*/
if (type.floating) {
if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
assert(width == 8);
if (format_desc->swizzle[3] == chan) {
input = lp_build_unsigned_norm_to_float(gallivm, width, type, input);
}
else {
struct lp_type conv_type = lp_uint_type(type);
input = lp_build_srgb_to_linear(gallivm, conv_type, input);
}
}
else {
if(format_desc->channel[chan].normalized)
input = lp_build_unsigned_norm_to_float(gallivm, width, type, input);
else
input = LLVMBuildSIToFP(builder, input,
lp_build_vec_type(gallivm, type), "");
}
}
else if (format_desc->channel[chan].pure_integer) {
/* Nothing to do */
} else {
/* FIXME */
assert(0);
}
break;
case UTIL_FORMAT_TYPE_SIGNED:
/*
* Align the sign bit first.
*/
if (stop < type.width) {
unsigned bits = type.width - stop;
LLVMValueRef bits_val = lp_build_const_int_vec(gallivm, type, bits);
input = LLVMBuildShl(builder, input, bits_val, "");
}
/*
* Align the LSB (with an arithmetic shift to preserve the sign)
*/
if (format_desc->channel[chan].size < type.width) {
unsigned bits = type.width - format_desc->channel[chan].size;
LLVMValueRef bits_val = lp_build_const_int_vec(gallivm, type, bits);
input = LLVMBuildAShr(builder, input, bits_val, "");
}
/*
* Type conversion
*/
if (type.floating) {
input = LLVMBuildSIToFP(builder, input, lp_build_vec_type(gallivm, type), "");
if (format_desc->channel[chan].normalized) {
double scale = 1.0 / ((1 << (format_desc->channel[chan].size - 1)) - 1);
LLVMValueRef scale_val = lp_build_const_vec(gallivm, type, scale);
input = LLVMBuildFMul(builder, input, scale_val, "");
/* the formula above will produce value below -1.0 for most negative
* value but everything seems happy with that hence disable for now */
if (0)
input = lp_build_max(&bld, input,
lp_build_const_vec(gallivm, type, -1.0f));
}
}
else if (format_desc->channel[chan].pure_integer) {
/* Nothing to do */
} else {
/* FIXME */
assert(0);
}
break;
case UTIL_FORMAT_TYPE_FLOAT:
if (type.floating) {
assert(start == 0);
assert(stop == 32);
assert(type.width == 32);
input = LLVMBuildBitCast(builder, input, lp_build_vec_type(gallivm, type), "");
}
else {
/* FIXME */
assert(0);
input = lp_build_undef(gallivm, type);
}
break;
case UTIL_FORMAT_TYPE_FIXED:
if (type.floating) {
double scale = 1.0 / ((1 << (format_desc->channel[chan].size/2)) - 1);
LLVMValueRef scale_val = lp_build_const_vec(gallivm, type, scale);
input = LLVMBuildSIToFP(builder, input, lp_build_vec_type(gallivm, type), "");
input = LLVMBuildFMul(builder, input, scale_val, "");
}
else {
/* FIXME */
assert(0);
input = lp_build_undef(gallivm, type);
}
break;
default:
assert(0);
input = lp_build_undef(gallivm, type);
break;
}
inputs[chan] = input;
}
lp_build_format_swizzle_soa(format_desc, &bld, inputs, rgba_out);
}
static LLVMValueRef
lp_build_extract_soa_chan(struct lp_build_context *bld,
unsigned blockbits,
boolean srgb_chan,
struct util_format_channel_description chan_desc,
LLVMValueRef packed)
{
struct gallivm_state *gallivm = bld->gallivm;
LLVMBuilderRef builder = gallivm->builder;
struct lp_type type = bld->type;
LLVMValueRef input = packed;
const unsigned width = chan_desc.size;
const unsigned start = chan_desc.shift;
const unsigned stop = start + width;
/* Decode the input vector component */
switch(chan_desc.type) {
case UTIL_FORMAT_TYPE_VOID:
input = bld->undef;
break;
case UTIL_FORMAT_TYPE_UNSIGNED:
/*
* Align the LSB
*/
if (start) {
input = LLVMBuildLShr(builder, input,
lp_build_const_int_vec(gallivm, type, start), "");
}
/*
* Zero the MSBs
*/
if (stop < blockbits) {
unsigned mask = ((unsigned long long)1 << width) - 1;
input = LLVMBuildAnd(builder, input,
lp_build_const_int_vec(gallivm, type, mask), "");
}
/*
* Type conversion
*/
if (type.floating) {
if (srgb_chan) {
struct lp_type conv_type = lp_uint_type(type);
input = lp_build_srgb_to_linear(gallivm, conv_type, width, input);
}
else {
if(chan_desc.normalized)
input = lp_build_unsigned_norm_to_float(gallivm, width, type, input);
else
input = LLVMBuildSIToFP(builder, input, bld->vec_type, "");
}
}
else if (chan_desc.pure_integer) {
/* Nothing to do */
} else {
/* FIXME */
assert(0);
}
break;
case UTIL_FORMAT_TYPE_SIGNED:
/*
* Align the sign bit first.
*/
if (stop < type.width) {
unsigned bits = type.width - stop;
LLVMValueRef bits_val = lp_build_const_int_vec(gallivm, type, bits);
input = LLVMBuildShl(builder, input, bits_val, "");
}
/*
* Align the LSB (with an arithmetic shift to preserve the sign)
*/
if (chan_desc.size < type.width) {
unsigned bits = type.width - chan_desc.size;
LLVMValueRef bits_val = lp_build_const_int_vec(gallivm, type, bits);
input = LLVMBuildAShr(builder, input, bits_val, "");
}
/*
* Type conversion
*/
if (type.floating) {
input = LLVMBuildSIToFP(builder, input, bld->vec_type, "");
if (chan_desc.normalized) {
double scale = 1.0 / ((1 << (chan_desc.size - 1)) - 1);
LLVMValueRef scale_val = lp_build_const_vec(gallivm, type, scale);
input = LLVMBuildFMul(builder, input, scale_val, "");
/*
* The formula above will produce value below -1.0 for most negative
* value but everything seems happy with that hence disable for now.
*/
if (0)
input = lp_build_max(bld, input,
lp_build_const_vec(gallivm, type, -1.0f));
}
}
else if (chan_desc.pure_integer) {
/* Nothing to do */
} else {
/* FIXME */
assert(0);
}
break;
case UTIL_FORMAT_TYPE_FLOAT:
if (type.floating) {
if (chan_desc.size == 16) {
struct lp_type f16i_type = type;
f16i_type.width /= 2;
f16i_type.floating = 0;
if (start) {
input = LLVMBuildLShr(builder, input,
lp_build_const_int_vec(gallivm, type, start), "");
}
input = LLVMBuildTrunc(builder, input,
lp_build_vec_type(gallivm, f16i_type), "");
input = lp_build_half_to_float(gallivm, input);
} else {
assert(start == 0);
assert(stop == 32);
assert(type.width == 32);
}
input = LLVMBuildBitCast(builder, input, bld->vec_type, "");
}
else {
/* FIXME */
assert(0);
input = bld->undef;
}
break;
case UTIL_FORMAT_TYPE_FIXED:
if (type.floating) {
double scale = 1.0 / ((1 << (chan_desc.size/2)) - 1);
LLVMValueRef scale_val = lp_build_const_vec(gallivm, type, scale);
input = LLVMBuildSIToFP(builder, input, bld->vec_type, "");
input = LLVMBuildFMul(builder, input, scale_val, "");
}
else {
/* FIXME */
assert(0);
input = bld->undef;
}
break;
default:
assert(0);
input = bld->undef;
break;
}
return input;
}
