209 lines
6.7 KiB
C
209 lines
6.7 KiB
C
/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "util/u_format.h"
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#include "lp_bld_type.h"
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#include "lp_bld_const.h"
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#include "lp_bld_conv.h"
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#include "lp_bld_format.h"
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/**
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* Gather elements from scatter positions in memory into a single vector.
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*
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* @param src_width src element width
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* @param dst_width result element width (source will be expanded to fit)
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* @param length length of the offsets,
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* @param base_ptr base pointer, should be a i8 pointer type.
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* @param offsets vector with offsets
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*/
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LLVMValueRef
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lp_build_gather(LLVMBuilderRef builder,
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unsigned length,
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unsigned src_width,
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unsigned dst_width,
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LLVMValueRef base_ptr,
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LLVMValueRef offsets)
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{
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LLVMTypeRef src_type = LLVMIntType(src_width);
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LLVMTypeRef src_ptr_type = LLVMPointerType(src_type, 0);
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LLVMTypeRef dst_elem_type = LLVMIntType(dst_width);
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LLVMTypeRef dst_vec_type = LLVMVectorType(dst_elem_type, length);
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LLVMValueRef res;
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unsigned i;
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res = LLVMGetUndef(dst_vec_type);
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for(i = 0; i < length; ++i) {
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LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
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LLVMValueRef elem_offset;
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LLVMValueRef elem_ptr;
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LLVMValueRef elem;
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elem_offset = LLVMBuildExtractElement(builder, offsets, index, "");
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elem_ptr = LLVMBuildGEP(builder, base_ptr, &elem_offset, 1, "");
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elem_ptr = LLVMBuildBitCast(builder, elem_ptr, src_ptr_type, "");
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elem = LLVMBuildLoad(builder, elem_ptr, "");
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assert(src_width <= dst_width);
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if(src_width > dst_width)
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elem = LLVMBuildTrunc(builder, elem, dst_elem_type, "");
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if(src_width < dst_width)
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elem = LLVMBuildZExt(builder, elem, dst_elem_type, "");
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res = LLVMBuildInsertElement(builder, res, elem, index, "");
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}
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return res;
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}
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static LLVMValueRef
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lp_build_format_swizzle(union lp_type type,
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const LLVMValueRef *inputs,
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enum util_format_swizzle swizzle)
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{
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switch (swizzle) {
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case UTIL_FORMAT_SWIZZLE_X:
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case UTIL_FORMAT_SWIZZLE_Y:
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case UTIL_FORMAT_SWIZZLE_Z:
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case UTIL_FORMAT_SWIZZLE_W:
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return inputs[swizzle];
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case UTIL_FORMAT_SWIZZLE_0:
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return lp_build_zero(type);
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case UTIL_FORMAT_SWIZZLE_1:
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return lp_build_one(type);
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case UTIL_FORMAT_SWIZZLE_NONE:
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return lp_build_undef(type);
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default:
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assert(0);
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return lp_build_undef(type);
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}
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}
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void
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lp_build_unpack_rgba_soa(LLVMBuilderRef builder,
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const struct util_format_description *format_desc,
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union lp_type type,
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LLVMValueRef packed,
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LLVMValueRef *rgba)
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{
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LLVMValueRef inputs[4];
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unsigned start;
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unsigned chan;
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/* FIXME: Support more formats */
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assert(format_desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
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assert(format_desc->block.width == 1);
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assert(format_desc->block.height == 1);
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assert(format_desc->block.bits <= 32);
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/* Decode the input vector components */
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start = 0;
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for (chan = 0; chan < 4; ++chan) {
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unsigned width = format_desc->channel[chan].size;
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unsigned stop = start + width;
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LLVMValueRef input;
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input = packed;
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switch(format_desc->channel[chan].type) {
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case UTIL_FORMAT_TYPE_VOID:
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input = NULL;
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break;
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case UTIL_FORMAT_TYPE_UNSIGNED:
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if(type.floating) {
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if(start)
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input = LLVMBuildLShr(builder, input, lp_build_int_const_scalar(type, start), "");
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if(stop < format_desc->block.bits) {
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unsigned mask = ((unsigned long long)1 << width) - 1;
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input = LLVMBuildAnd(builder, input, lp_build_int_const_scalar(type, mask), "");
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}
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if(format_desc->channel[chan].normalized)
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input = lp_build_unsigned_norm_to_float(builder, width, type, input);
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else
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input = LLVMBuildFPToSI(builder, input, lp_build_vec_type(type), "");
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}
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else {
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/* FIXME */
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assert(0);
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input = lp_build_undef(type);
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}
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break;
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default:
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/* fall through */
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input = lp_build_undef(type);
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break;
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}
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inputs[chan] = input;
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start = stop;
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}
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if(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
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enum util_format_swizzle swizzle = format_desc->swizzle[0];
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LLVMValueRef depth = lp_build_format_swizzle(type, inputs, swizzle);
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rgba[2] = rgba[1] = rgba[0] = depth;
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rgba[3] = lp_build_one(type);
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}
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else {
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for (chan = 0; chan < 4; ++chan) {
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enum util_format_swizzle swizzle = format_desc->swizzle[chan];
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rgba[chan] = lp_build_format_swizzle(type, inputs, swizzle);
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}
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}
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}
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void
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lp_build_load_rgba_soa(LLVMBuilderRef builder,
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const struct util_format_description *format_desc,
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union lp_type type,
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LLVMValueRef base_ptr,
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LLVMValueRef offsets,
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LLVMValueRef *rgba)
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{
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LLVMValueRef packed;
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assert(format_desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
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assert(format_desc->block.width == 1);
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assert(format_desc->block.height == 1);
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assert(format_desc->block.bits <= 32);
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packed = lp_build_gather(builder,
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type.length, format_desc->block.bits, type.width,
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base_ptr, offsets);
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lp_build_unpack_rgba_soa(builder, format_desc, type, packed, rgba);
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}
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