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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 -- common code.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#include "pipe/p_defines.h"
#include "pipe/p_state.h"
#include "util/u_format.h"
#include "util/u_math.h"
#include "lp_bld_debug.h"
#include "lp_bld_const.h"
#include "lp_bld_arit.h"
#include "lp_bld_type.h"
#include "lp_bld_format.h"
#include "lp_bld_sample.h"
void
lp_sampler_static_state(struct lp_sampler_static_state *state,
const struct pipe_texture *texture,
const struct pipe_sampler_state *sampler)
{
memset(state, 0, sizeof *state);
if(!texture)
return;
if(!sampler)
return;
state->format = texture->format;
state->target = texture->target;
state->pot_width = util_is_pot(texture->width0);
state->pot_height = util_is_pot(texture->height0);
state->pot_depth = util_is_pot(texture->depth0);
state->wrap_s = sampler->wrap_s;
state->wrap_t = sampler->wrap_t;
state->wrap_r = sampler->wrap_r;
state->min_img_filter = sampler->min_img_filter;
state->min_mip_filter = sampler->min_mip_filter;
state->mag_img_filter = sampler->mag_img_filter;
if(sampler->compare_mode) {
state->compare_mode = sampler->compare_mode;
state->compare_func = sampler->compare_func;
}
state->normalized_coords = sampler->normalized_coords;
state->prefilter = sampler->prefilter;
}
/**
* Gather elements from scatter positions in memory into a single vector.
*
* @param src_width src element width
* @param dst_width result element width (source will be expanded to fit)
* @param length length of the offsets,
* @param base_ptr base pointer, should be a i8 pointer type.
* @param offsets vector with offsets
*/
LLVMValueRef
lp_build_gather(LLVMBuilderRef builder,
unsigned length,
unsigned src_width,
unsigned dst_width,
LLVMValueRef base_ptr,
LLVMValueRef offsets)
{
LLVMTypeRef src_type = LLVMIntType(src_width);
LLVMTypeRef src_ptr_type = LLVMPointerType(src_type, 0);
LLVMTypeRef dst_elem_type = LLVMIntType(dst_width);
LLVMTypeRef dst_vec_type = LLVMVectorType(dst_elem_type, length);
LLVMValueRef res;
unsigned i;
res = LLVMGetUndef(dst_vec_type);
for(i = 0; i < length; ++i) {
LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
LLVMValueRef elem_offset;
LLVMValueRef elem_ptr;
LLVMValueRef elem;
elem_offset = LLVMBuildExtractElement(builder, offsets, index, "");
elem_ptr = LLVMBuildGEP(builder, base_ptr, &elem_offset, 1, "");
elem_ptr = LLVMBuildBitCast(builder, elem_ptr, src_ptr_type, "");
elem = LLVMBuildLoad(builder, elem_ptr, "");
assert(src_width <= dst_width);
if(src_width > dst_width)
elem = LLVMBuildTrunc(builder, elem, dst_elem_type, "");
if(src_width < dst_width)
elem = LLVMBuildZExt(builder, elem, dst_elem_type, "");
res = LLVMBuildInsertElement(builder, res, elem, index, "");
}
return res;
}
/**
* Compute the offset of a pixel.
*
* x, y, y_stride are vectors
*/
LLVMValueRef
lp_build_sample_offset(struct lp_build_context *bld,
const struct util_format_description *format_desc,
LLVMValueRef x,
LLVMValueRef y,
LLVMValueRef y_stride,
LLVMValueRef data_ptr)
{
LLVMValueRef x_stride;
LLVMValueRef offset;
x_stride = lp_build_const_scalar(bld->type, format_desc->block.bits/8);
if(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
LLVMValueRef x_lo, x_hi;
LLVMValueRef y_lo, y_hi;
LLVMValueRef x_stride_lo, x_stride_hi;
LLVMValueRef y_stride_lo, y_stride_hi;
LLVMValueRef x_offset_lo, x_offset_hi;
LLVMValueRef y_offset_lo, y_offset_hi;
LLVMValueRef offset_lo, offset_hi;
x_lo = LLVMBuildAnd(bld->builder, x, bld->one, "");
y_lo = LLVMBuildAnd(bld->builder, y, bld->one, "");
x_hi = LLVMBuildLShr(bld->builder, x, bld->one, "");
y_hi = LLVMBuildLShr(bld->builder, y, bld->one, "");
x_stride_lo = x_stride;
y_stride_lo = lp_build_const_scalar(bld->type, 2*format_desc->block.bits/8);
x_stride_hi = lp_build_const_scalar(bld->type, 4*format_desc->block.bits/8);
y_stride_hi = LLVMBuildShl(bld->builder, y_stride, bld->one, "");
x_offset_lo = lp_build_mul(bld, x_lo, x_stride_lo);
y_offset_lo = lp_build_mul(bld, y_lo, y_stride_lo);
offset_lo = lp_build_add(bld, x_offset_lo, y_offset_lo);
x_offset_hi = lp_build_mul(bld, x_hi, x_stride_hi);
y_offset_hi = lp_build_mul(bld, y_hi, y_stride_hi);
offset_hi = lp_build_add(bld, x_offset_hi, y_offset_hi);
offset = lp_build_add(bld, offset_hi, offset_lo);
}
else {
LLVMValueRef x_offset;
LLVMValueRef y_offset;
x_offset = lp_build_mul(bld, x, x_stride);
y_offset = lp_build_mul(bld, y, y_stride);
offset = lp_build_add(bld, x_offset, y_offset);
}
return offset;
}
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