| /************************************************************************** |
| * |
| * 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; |
| state->compare_mode = sampler->compare_mode; |
| if(sampler->compare_mode != PIPE_TEX_COMPARE_NONE) { |
| 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; |
| } |