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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.
*
**************************************************************************/
/**
* @file
* Texture sampling -- SoA.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#include "pipe/p_defines.h"
#include "pipe/p_state.h"
#include "util/u_debug.h"
#include "util/u_debug_dump.h"
#include "util/u_memory.h"
#include "util/u_math.h"
#include "util/u_format.h"
#include "util/u_cpu_detect.h"
#include "lp_bld_debug.h"
#include "lp_bld_type.h"
#include "lp_bld_const.h"
#include "lp_bld_conv.h"
#include "lp_bld_arit.h"
#include "lp_bld_logic.h"
#include "lp_bld_swizzle.h"
#include "lp_bld_pack.h"
#include "lp_bld_format.h"
#include "lp_bld_sample.h"
/**
* Keep all information for sampling code generation in a single place.
*/
struct lp_build_sample_context
{
LLVMBuilderRef builder;
const struct lp_sampler_static_state *static_state;
struct lp_sampler_dynamic_state *dynamic_state;
const struct util_format_description *format_desc;
/** Incoming coordinates type and build context */
struct lp_type coord_type;
struct lp_build_context coord_bld;
/** Integer coordinates */
struct lp_type int_coord_type;
struct lp_build_context int_coord_bld;
/** Output texels type and build context */
struct lp_type texel_type;
struct lp_build_context texel_bld;
};
static void
lp_build_sample_texel_soa(struct lp_build_sample_context *bld,
LLVMValueRef x,
LLVMValueRef y,
LLVMValueRef y_stride,
LLVMValueRef data_ptr,
LLVMValueRef *texel)
{
LLVMValueRef offset;
LLVMValueRef packed;
offset = lp_build_sample_offset(&bld->int_coord_bld,
bld->format_desc,
x, y, y_stride,
data_ptr);
assert(bld->format_desc->block.width == 1);
assert(bld->format_desc->block.height == 1);
assert(bld->format_desc->block.bits <= bld->texel_type.width);
packed = lp_build_gather(bld->builder,
bld->texel_type.length,
bld->format_desc->block.bits,
bld->texel_type.width,
data_ptr, offset);
lp_build_unpack_rgba_soa(bld->builder,
bld->format_desc,
bld->texel_type,
packed, texel);
}
static LLVMValueRef
lp_build_sample_packed(struct lp_build_sample_context *bld,
LLVMValueRef x,
LLVMValueRef y,
LLVMValueRef y_stride,
LLVMValueRef data_ptr)
{
LLVMValueRef offset;
offset = lp_build_sample_offset(&bld->int_coord_bld,
bld->format_desc,
x, y, y_stride,
data_ptr);
assert(bld->format_desc->block.width == 1);
assert(bld->format_desc->block.height == 1);
assert(bld->format_desc->block.bits <= bld->texel_type.width);
return lp_build_gather(bld->builder,
bld->texel_type.length,
bld->format_desc->block.bits,
bld->texel_type.width,
data_ptr, offset);
}
static LLVMValueRef
lp_build_sample_wrap(struct lp_build_sample_context *bld,
LLVMValueRef coord,
LLVMValueRef length,
boolean is_pot,
unsigned wrap_mode)
{
struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
LLVMValueRef length_minus_one;
length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one);
switch(wrap_mode) {
case PIPE_TEX_WRAP_REPEAT:
if(is_pot)
coord = LLVMBuildAnd(bld->builder, coord, length_minus_one, "");
else
/* Signed remainder won't give the right results for negative
* dividends but unsigned remainder does.*/
coord = LLVMBuildURem(bld->builder, coord, length, "");
break;
case PIPE_TEX_WRAP_CLAMP:
coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
coord = lp_build_min(int_coord_bld, coord, length_minus_one);
break;
case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
case PIPE_TEX_WRAP_MIRROR_REPEAT:
case PIPE_TEX_WRAP_MIRROR_CLAMP:
case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
/* FIXME */
_debug_printf("warning: failed to translate texture wrap mode %s\n",
debug_dump_tex_wrap(wrap_mode, TRUE));
coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
coord = lp_build_min(int_coord_bld, coord, length_minus_one);
break;
default:
assert(0);
}
return coord;
}
static void
lp_build_sample_2d_nearest_soa(struct lp_build_sample_context *bld,
LLVMValueRef s,
LLVMValueRef t,
LLVMValueRef width,
LLVMValueRef height,
LLVMValueRef stride,
LLVMValueRef data_ptr,
LLVMValueRef *texel)
{
LLVMValueRef x;
LLVMValueRef y;
x = lp_build_ifloor(&bld->coord_bld, s);
y = lp_build_ifloor(&bld->coord_bld, t);
x = lp_build_sample_wrap(bld, x, width, bld->static_state->pot_width, bld->static_state->wrap_s);
y = lp_build_sample_wrap(bld, y, height, bld->static_state->pot_height, bld->static_state->wrap_t);
lp_build_sample_texel_soa(bld, x, y, stride, data_ptr, texel);
}
static void
lp_build_sample_2d_linear_soa(struct lp_build_sample_context *bld,
LLVMValueRef s,
LLVMValueRef t,
LLVMValueRef width,
LLVMValueRef height,
LLVMValueRef stride,
LLVMValueRef data_ptr,
LLVMValueRef *texel)
{
LLVMValueRef half;
LLVMValueRef s_ipart;
LLVMValueRef t_ipart;
LLVMValueRef s_fpart;
LLVMValueRef t_fpart;
LLVMValueRef x0, x1;
LLVMValueRef y0, y1;
LLVMValueRef neighbors[2][2][4];
unsigned chan;
half = lp_build_const_scalar(bld->coord_type, 0.5);
s = lp_build_sub(&bld->coord_bld, s, half);
t = lp_build_sub(&bld->coord_bld, t, half);
s_ipart = lp_build_floor(&bld->coord_bld, s);
t_ipart = lp_build_floor(&bld->coord_bld, t);
s_fpart = lp_build_sub(&bld->coord_bld, s, s_ipart);
t_fpart = lp_build_sub(&bld->coord_bld, t, t_ipart);
x0 = lp_build_itrunc(&bld->coord_bld, s_ipart);
y0 = lp_build_itrunc(&bld->coord_bld, t_ipart);
x0 = lp_build_sample_wrap(bld, x0, width, bld->static_state->pot_width, bld->static_state->wrap_s);
y0 = lp_build_sample_wrap(bld, y0, height, bld->static_state->pot_height, bld->static_state->wrap_t);
x1 = lp_build_add(&bld->int_coord_bld, x0, bld->int_coord_bld.one);
y1 = lp_build_add(&bld->int_coord_bld, y0, bld->int_coord_bld.one);
x1 = lp_build_sample_wrap(bld, x1, width, bld->static_state->pot_width, bld->static_state->wrap_s);
y1 = lp_build_sample_wrap(bld, y1, height, bld->static_state->pot_height, bld->static_state->wrap_t);
lp_build_sample_texel_soa(bld, x0, y0, stride, data_ptr, neighbors[0][0]);
lp_build_sample_texel_soa(bld, x1, y0, stride, data_ptr, neighbors[0][1]);
lp_build_sample_texel_soa(bld, x0, y1, stride, data_ptr, neighbors[1][0]);
lp_build_sample_texel_soa(bld, x1, y1, stride, data_ptr, neighbors[1][1]);
/* TODO: Don't interpolate missing channels */
for(chan = 0; chan < 4; ++chan) {
texel[chan] = lp_build_lerp_2d(&bld->texel_bld,
s_fpart, t_fpart,
neighbors[0][0][chan],
neighbors[0][1][chan],
neighbors[1][0][chan],
neighbors[1][1][chan]);
}
}
static void
lp_build_rgba8_to_f32_soa(LLVMBuilderRef builder,
struct lp_type dst_type,
LLVMValueRef packed,
LLVMValueRef *rgba)
{
LLVMValueRef mask = lp_build_int_const_scalar(dst_type, 0xff);
unsigned chan;
/* Decode the input vector components */
for (chan = 0; chan < 4; ++chan) {
unsigned start = chan*8;
unsigned stop = start + 8;
LLVMValueRef input;
input = packed;
if(start)
input = LLVMBuildLShr(builder, input, lp_build_int_const_scalar(dst_type, start), "");
if(stop < 32)
input = LLVMBuildAnd(builder, input, mask, "");
input = lp_build_unsigned_norm_to_float(builder, 8, dst_type, input);
rgba[chan] = input;
}
}
static void
lp_build_sample_2d_linear_aos(struct lp_build_sample_context *bld,
LLVMValueRef s,
LLVMValueRef t,
LLVMValueRef width,
LLVMValueRef height,
LLVMValueRef stride,
LLVMValueRef data_ptr,
LLVMValueRef *texel)
{
LLVMBuilderRef builder = bld->builder;
struct lp_build_context i32, h16, u8n;
LLVMTypeRef i32_vec_type, h16_vec_type, u8n_vec_type;
LLVMValueRef i32_c8, i32_c128, i32_c255;
LLVMValueRef s_ipart, s_fpart, s_fpart_lo, s_fpart_hi;
LLVMValueRef t_ipart, t_fpart, t_fpart_lo, t_fpart_hi;
LLVMValueRef x0, x1;
LLVMValueRef y0, y1;
LLVMValueRef neighbors[2][2];
LLVMValueRef neighbors_lo[2][2];
LLVMValueRef neighbors_hi[2][2];
LLVMValueRef packed, packed_lo, packed_hi;
LLVMValueRef unswizzled[4];
lp_build_context_init(&i32, builder, lp_type_int(32));
lp_build_context_init(&h16, builder, lp_type_ufixed(16));
lp_build_context_init(&u8n, builder, lp_type_unorm(8));
i32_vec_type = lp_build_vec_type(i32.type);
h16_vec_type = lp_build_vec_type(h16.type);
u8n_vec_type = lp_build_vec_type(u8n.type);
s = lp_build_mul_imm(&bld->coord_bld, s, 256);
t = lp_build_mul_imm(&bld->coord_bld, t, 256);
s = LLVMBuildFPToSI(builder, s, i32_vec_type, "");
t = LLVMBuildFPToSI(builder, t, i32_vec_type, "");
i32_c128 = lp_build_int_const_scalar(i32.type, -128);
s = LLVMBuildAdd(builder, s, i32_c128, "");
t = LLVMBuildAdd(builder, t, i32_c128, "");
i32_c8 = lp_build_int_const_scalar(i32.type, 8);
s_ipart = LLVMBuildAShr(builder, s, i32_c8, "");
t_ipart = LLVMBuildAShr(builder, t, i32_c8, "");
i32_c255 = lp_build_int_const_scalar(i32.type, 255);
s_fpart = LLVMBuildAnd(builder, s, i32_c255, "");
t_fpart = LLVMBuildAnd(builder, t, i32_c255, "");
x0 = s_ipart;
y0 = t_ipart;
x0 = lp_build_sample_wrap(bld, x0, width, bld->static_state->pot_width, bld->static_state->wrap_s);
y0 = lp_build_sample_wrap(bld, y0, height, bld->static_state->pot_height, bld->static_state->wrap_t);
x1 = lp_build_add(&bld->int_coord_bld, x0, bld->int_coord_bld.one);
y1 = lp_build_add(&bld->int_coord_bld, y0, bld->int_coord_bld.one);
x1 = lp_build_sample_wrap(bld, x1, width, bld->static_state->pot_width, bld->static_state->wrap_s);
y1 = lp_build_sample_wrap(bld, y1, height, bld->static_state->pot_height, bld->static_state->wrap_t);
/*
* Transform 4 x i32 in
*
* s_fpart = {s0, s1, s2, s3}
*
* into 8 x i16
*
* s_fpart = {00, s0, 00, s1, 00, s2, 00, s3}
*
* into two 8 x i16
*
* s_fpart_lo = {s0, s0, s0, s0, s1, s1, s1, s1}
* s_fpart_hi = {s2, s2, s2, s2, s3, s3, s3, s3}
*
* and likewise for t_fpart. There is no risk of loosing precision here
* since the fractional parts only use the lower 8bits.
*/
s_fpart = LLVMBuildBitCast(builder, s_fpart, h16_vec_type, "");
t_fpart = LLVMBuildBitCast(builder, t_fpart, h16_vec_type, "");
{
LLVMTypeRef elem_type = LLVMInt32Type();
LLVMValueRef shuffles_lo[LP_MAX_VECTOR_LENGTH];
LLVMValueRef shuffles_hi[LP_MAX_VECTOR_LENGTH];
LLVMValueRef shuffle_lo;
LLVMValueRef shuffle_hi;
unsigned i, j;
for(j = 0; j < h16.type.length; j += 4) {
unsigned subindex = util_cpu_caps.little_endian ? 0 : 1;
LLVMValueRef index;
index = LLVMConstInt(elem_type, j/2 + subindex, 0);
for(i = 0; i < 4; ++i)
shuffles_lo[j + i] = index;
index = LLVMConstInt(elem_type, h16.type.length/2 + j/2 + subindex, 0);
for(i = 0; i < 4; ++i)
shuffles_hi[j + i] = index;
}
shuffle_lo = LLVMConstVector(shuffles_lo, h16.type.length);
shuffle_hi = LLVMConstVector(shuffles_hi, h16.type.length);
s_fpart_lo = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_lo, "");
t_fpart_lo = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_lo, "");
s_fpart_hi = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_hi, "");
t_fpart_hi = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_hi, "");
}
/*
* Fetch the pixels as 4 x 32bit (rgba order might differ):
*
* rgba0 rgba1 rgba2 rgba3
*
* bit cast them into 16 x u8
*
* r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3
*
* unpack them into two 8 x i16:
*
* r0 g0 b0 a0 r1 g1 b1 a1
* r2 g2 b2 a2 r3 g3 b3 a3
*
* The higher 8 bits of the resulting elements will be zero.
*/
neighbors[0][0] = lp_build_sample_packed(bld, x0, y0, stride, data_ptr);
neighbors[0][1] = lp_build_sample_packed(bld, x1, y0, stride, data_ptr);
neighbors[1][0] = lp_build_sample_packed(bld, x0, y1, stride, data_ptr);
neighbors[1][1] = lp_build_sample_packed(bld, x1, y1, stride, data_ptr);
neighbors[0][0] = LLVMBuildBitCast(builder, neighbors[0][0], u8n_vec_type, "");
neighbors[0][1] = LLVMBuildBitCast(builder, neighbors[0][1], u8n_vec_type, "");
neighbors[1][0] = LLVMBuildBitCast(builder, neighbors[1][0], u8n_vec_type, "");
neighbors[1][1] = LLVMBuildBitCast(builder, neighbors[1][1], u8n_vec_type, "");
lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][0], &neighbors_lo[0][0], &neighbors_hi[0][0]);
lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][1], &neighbors_lo[0][1], &neighbors_hi[0][1]);
lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][0], &neighbors_lo[1][0], &neighbors_hi[1][0]);
lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][1], &neighbors_lo[1][1], &neighbors_hi[1][1]);
/*
* Linear interpolate with 8.8 fixed point.
*/
packed_lo = lp_build_lerp_2d(&h16,
s_fpart_lo, t_fpart_lo,
neighbors_lo[0][0],
neighbors_lo[0][1],
neighbors_lo[1][0],
neighbors_lo[1][1]);
packed_hi = lp_build_lerp_2d(&h16,
s_fpart_hi, t_fpart_hi,
neighbors_hi[0][0],
neighbors_hi[0][1],
neighbors_hi[1][0],
neighbors_hi[1][1]);
packed = lp_build_pack2(builder, h16.type, u8n.type, packed_lo, packed_hi);
/*
* Convert to SoA and swizzle.
*/
packed = LLVMBuildBitCast(builder, packed, i32_vec_type, "");
lp_build_rgba8_to_f32_soa(bld->builder,
bld->texel_type,
packed, unswizzled);
lp_build_format_swizzle_soa(bld->format_desc,
bld->texel_type, unswizzled,
texel);
}
static void
lp_build_sample_compare(struct lp_build_sample_context *bld,
LLVMValueRef p,
LLVMValueRef *texel)
{
struct lp_build_context *texel_bld = &bld->texel_bld;
LLVMValueRef res;
unsigned chan;
if(!bld->static_state->compare_mode)
return;
/* TODO: Compare before swizzling, to avoid redundant computations */
res = NULL;
for(chan = 0; chan < 4; ++chan) {
LLVMValueRef cmp;
cmp = lp_build_cmp(texel_bld, bld->static_state->compare_func, p, texel[chan]);
cmp = lp_build_select(texel_bld, cmp, texel_bld->one, texel_bld->zero);
if(res)
res = lp_build_add(texel_bld, res, cmp);
else
res = cmp;
}
assert(res);
res = lp_build_mul(texel_bld, res, lp_build_const_scalar(texel_bld->type, 0.25));
/* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
for(chan = 0; chan < 3; ++chan)
texel[chan] = res;
texel[3] = texel_bld->one;
}
void
lp_build_sample_soa(LLVMBuilderRef builder,
const struct lp_sampler_static_state *static_state,
struct lp_sampler_dynamic_state *dynamic_state,
struct lp_type type,
unsigned unit,
unsigned num_coords,
const LLVMValueRef *coords,
LLVMValueRef lodbias,
LLVMValueRef *texel)
{
struct lp_build_sample_context bld;
LLVMValueRef width;
LLVMValueRef height;
LLVMValueRef stride;
LLVMValueRef data_ptr;
LLVMValueRef s;
LLVMValueRef t;
LLVMValueRef p;
/* Setup our build context */
memset(&bld, 0, sizeof bld);
bld.builder = builder;
bld.static_state = static_state;
bld.dynamic_state = dynamic_state;
bld.format_desc = util_format_description(static_state->format);
bld.coord_type = type;
bld.int_coord_type = lp_int_type(type);
bld.texel_type = type;
lp_build_context_init(&bld.coord_bld, builder, bld.coord_type);
lp_build_context_init(&bld.int_coord_bld, builder, bld.int_coord_type);
lp_build_context_init(&bld.texel_bld, builder, bld.texel_type);
/* Get the dynamic state */
width = dynamic_state->width(dynamic_state, builder, unit);
height = dynamic_state->height(dynamic_state, builder, unit);
stride = dynamic_state->stride(dynamic_state, builder, unit);
data_ptr = dynamic_state->data_ptr(dynamic_state, builder, unit);
s = coords[0];
t = coords[1];
p = coords[2];
width = lp_build_broadcast_scalar(&bld.int_coord_bld, width);
height = lp_build_broadcast_scalar(&bld.int_coord_bld, height);
stride = lp_build_broadcast_scalar(&bld.int_coord_bld, stride);
if(static_state->target == PIPE_TEXTURE_1D)
t = bld.coord_bld.zero;
if(static_state->normalized_coords) {
LLVMTypeRef coord_vec_type = lp_build_vec_type(bld.coord_type);
LLVMValueRef fp_width = LLVMBuildSIToFP(builder, width, coord_vec_type, "");
LLVMValueRef fp_height = LLVMBuildSIToFP(builder, height, coord_vec_type, "");
s = lp_build_mul(&bld.coord_bld, s, fp_width);
t = lp_build_mul(&bld.coord_bld, t, fp_height);
}
switch (static_state->min_img_filter) {
case PIPE_TEX_FILTER_NEAREST:
lp_build_sample_2d_nearest_soa(&bld, s, t, width, height, stride, data_ptr, texel);
break;
case PIPE_TEX_FILTER_LINEAR:
if(lp_format_is_rgba8(bld.format_desc))
lp_build_sample_2d_linear_aos(&bld, s, t, width, height, stride, data_ptr, texel);
else
lp_build_sample_2d_linear_soa(&bld, s, t, width, height, stride, data_ptr, texel);
break;
default:
assert(0);
}
/* FIXME: respect static_state->min_mip_filter */;
/* FIXME: respect static_state->mag_img_filter */;
/* FIXME: respect static_state->prefilter */;
lp_build_sample_compare(&bld, p, texel);
}
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