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/**************************************************************************
*
* Copyright 2010 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 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
* THE COPYRIGHT HOLDERS, AUTHORS 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
**************************************************************************/
#include "lp_bld_type.h"
#include "lp_bld_arit.h"
#include "lp_bld_const.h"
#include "lp_bld_swizzle.h"
#include "lp_bld_quad.h"
#include "lp_bld_pack.h"
static const unsigned char
swizzle_left[4] = {
LP_BLD_QUAD_TOP_LEFT, LP_BLD_QUAD_TOP_LEFT,
LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_QUAD_BOTTOM_LEFT
};
static const unsigned char
swizzle_right[4] = {
LP_BLD_QUAD_TOP_RIGHT, LP_BLD_QUAD_TOP_RIGHT,
LP_BLD_QUAD_BOTTOM_RIGHT, LP_BLD_QUAD_BOTTOM_RIGHT
};
static const unsigned char
swizzle_top[4] = {
LP_BLD_QUAD_TOP_LEFT, LP_BLD_QUAD_TOP_RIGHT,
LP_BLD_QUAD_TOP_LEFT, LP_BLD_QUAD_TOP_RIGHT
};
static const unsigned char
swizzle_bottom[4] = {
LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_QUAD_BOTTOM_RIGHT,
LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_QUAD_BOTTOM_RIGHT
};
LLVMValueRef
lp_build_ddx(struct lp_build_context *bld,
LLVMValueRef a)
{
LLVMValueRef a_left = lp_build_swizzle_aos(bld, a, swizzle_left);
LLVMValueRef a_right = lp_build_swizzle_aos(bld, a, swizzle_right);
return lp_build_sub(bld, a_right, a_left);
}
LLVMValueRef
lp_build_ddy(struct lp_build_context *bld,
LLVMValueRef a)
{
LLVMValueRef a_top = lp_build_swizzle_aos(bld, a, swizzle_top);
LLVMValueRef a_bottom = lp_build_swizzle_aos(bld, a, swizzle_bottom);
return lp_build_sub(bld, a_bottom, a_top);
}
/*
* To be able to handle multiple quads at once in texture sampling and
* do lod calculations per quad, it is necessary to get the per-quad
* derivatives into the lp_build_rho function.
* For 8-wide vectors the packed derivative values for 3 coords would
* look like this, this scales to a arbitrary (multiple of 4) vector size:
* ds1dx ds1dy dt1dx dt1dy ds2dx ds2dy dt2dx dt2dy
* dr1dx dr1dy _____ _____ dr2dx dr2dy _____ _____
* The second vector will be unused for 1d and 2d textures.
*/
LLVMValueRef
lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,
LLVMValueRef a)
{
struct gallivm_state *gallivm = bld->gallivm;
LLVMBuilderRef builder = gallivm->builder;
LLVMValueRef vec1, vec2;
/* same packing as _twocoord, but can use aos swizzle helper */
/*
* XXX could make swizzle1 a noop swizzle by using right top/bottom
* pair for ddy
*/
static const unsigned char swizzle1[] = {
LP_BLD_QUAD_TOP_LEFT, LP_BLD_QUAD_TOP_LEFT,
LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE
};
static const unsigned char swizzle2[] = {
LP_BLD_QUAD_TOP_RIGHT, LP_BLD_QUAD_BOTTOM_LEFT,
LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE
};
vec1 = lp_build_swizzle_aos(bld, a, swizzle1);
vec2 = lp_build_swizzle_aos(bld, a, swizzle2);
if (bld->type.floating)
return LLVMBuildFSub(builder, vec2, vec1, "ddxddy");
else
return LLVMBuildSub(builder, vec2, vec1, "ddxddy");
}
LLVMValueRef
lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,
LLVMValueRef a, LLVMValueRef b)
{
struct gallivm_state *gallivm = bld->gallivm;
LLVMBuilderRef builder = gallivm->builder;
LLVMValueRef shuffles1[LP_MAX_VECTOR_LENGTH/4];
LLVMValueRef shuffles2[LP_MAX_VECTOR_LENGTH/4];
LLVMValueRef vec1, vec2;
unsigned length, num_quads, i;
/* XXX: do hsub version */
length = bld->type.length;
num_quads = length / 4;
for (i = 0; i < num_quads; i++) {
unsigned s1 = 4 * i;
unsigned s2 = 4 * i + length;
shuffles1[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);
shuffles1[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);
shuffles1[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);
shuffles1[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);
shuffles2[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s1);
shuffles2[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s1);
shuffles2[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s2);
shuffles2[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s2);
}
vec1 = LLVMBuildShuffleVector(builder, a, b,
LLVMConstVector(shuffles1, length), "");
vec2 = LLVMBuildShuffleVector(builder, a, b,
LLVMConstVector(shuffles2, length), "");
if (bld->type.floating)
return LLVMBuildFSub(builder, vec2, vec1, "ddxddyddxddy");
else
return LLVMBuildSub(builder, vec2, vec1, "ddxddyddxddy");
}
/**
* Twiddle from quad format to row format
*
* src0 src1
* ######### ######### #################
* # 0 | 1 # # 4 | 5 # # 0 | 1 | 4 | 5 # src0
* #---+---# #---+---# -> #################
* # 2 | 3 # # 6 | 7 # # 2 | 3 | 6 | 7 # src1
* ######### ######### #################
*
*/
void
lp_bld_quad_twiddle(struct gallivm_state *gallivm,
struct lp_type lp_dst_type,
const LLVMValueRef* src,
unsigned src_count,
LLVMValueRef* dst)
{
LLVMBuilderRef builder = gallivm->builder;
LLVMTypeRef dst_type_ref;
LLVMTypeRef type2_ref;
struct lp_type type2;
unsigned i;
assert((src_count % 2) == 0);
/* Create a type with only 2 elements */
type2 = lp_dst_type;
type2.width = (lp_dst_type.width * lp_dst_type.length) / 2;
type2.length = 2;
type2.floating = 0;
type2_ref = lp_build_vec_type(gallivm, type2);
dst_type_ref = lp_build_vec_type(gallivm, lp_dst_type);
for (i = 0; i < src_count; i += 2) {
LLVMValueRef src0, src1;
src0 = LLVMBuildBitCast(builder, src[i + 0], type2_ref, "");
src1 = LLVMBuildBitCast(builder, src[i + 1], type2_ref, "");
dst[i + 0] = lp_build_interleave2(gallivm, type2, src0, src1, 0);
dst[i + 1] = lp_build_interleave2(gallivm, type2, src0, src1, 1);
dst[i + 0] = LLVMBuildBitCast(builder, dst[i + 0], dst_type_ref, "");
dst[i + 1] = LLVMBuildBitCast(builder, dst[i + 1], dst_type_ref, "");
}
}
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