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llvmpipe: Support sampling from signed and mixed siged formats.

This commit is contained in:
José Fonseca 2010-04-01 17:45:29 +01:00
parent 675fcb6cae
commit 8f38135e28
1 changed files with 64 additions and 9 deletions
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73
src/gallium/auxiliary/gallivm/lp_bld_format_soa.c
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@ -108,18 +108,32 @@ lp_build_unpack_rgba_soa(LLVMBuilderRef builder,
switch(format_desc->channel[chan].type) {
case UTIL_FORMAT_TYPE_VOID:
input = NULL;
input = lp_build_undef(type);
break;
case UTIL_FORMAT_TYPE_UNSIGNED:
if(type.floating) {
if(start)
input = LLVMBuildLShr(builder, input, lp_build_const_int_vec(type, start), "");
if(stop < format_desc->block.bits) {
unsigned mask = ((unsigned long long)1 << width) - 1;
input = LLVMBuildAnd(builder, input, lp_build_const_int_vec(type, mask), "");
}
/*
* Align the LSB
*/
if (start) {
input = LLVMBuildLShr(builder, input, lp_build_const_int_vec(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(type, mask), "");
}
/*
* Type conversion
*/
if (type.floating) {
if(format_desc->channel[chan].normalized)
input = lp_build_unsigned_norm_to_float(builder, width, type, input);
else
@ -130,10 +144,51 @@ lp_build_unpack_rgba_soa(LLVMBuilderRef builder,
assert(0);
input = lp_build_undef(type);
}
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(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(type, bits);
input = LLVMBuildAShr(builder, input, bits_val, "");
}
/*
* Type conversion
*/
if (type.floating) {
input = LLVMBuildSIToFP(builder, input, lp_build_vec_type(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(type, scale);
input = LLVMBuildMul(builder, input, scale_val, "");
}
}
else {
/* FIXME */
assert(0);
input = lp_build_undef(type);
}
break;
default:
/* fall through */
input = lp_build_undef(type);
break;
}