diff options
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_bld_sample.c')
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_bld_sample.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_sample.c b/src/gallium/drivers/llvmpipe/lp_bld_sample.c new file mode 100644 index 00000000000..af70ddc6ab9 --- /dev/null +++ b/src/gallium/drivers/llvmpipe/lp_bld_sample.c @@ -0,0 +1,190 @@ +/************************************************************************** + * + * 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 <[email protected]> + */ + +#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; +} |