/************************************************************************** * * 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 * @author Brian Paul */ #include "pipe/p_defines.h" #include "pipe/p_state.h" #include "util/u_debug.h" #include "util/u_dump.h" #include "util/u_memory.h" #include "util/u_math.h" #include "util/u_format.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_bitarit.h" #include "lp_bld_logic.h" #include "lp_bld_printf.h" #include "lp_bld_swizzle.h" #include "lp_bld_flow.h" #include "lp_bld_gather.h" #include "lp_bld_format.h" #include "lp_bld_sample.h" #include "lp_bld_sample_aos.h" #include "lp_bld_struct.h" #include "lp_bld_quad.h" /** * Generate code to fetch a texel from a texture at int coords (x, y, z). * The computation depends on whether the texture is 1D, 2D or 3D. * The result, texel, will be float vectors: * texel[0] = red values * texel[1] = green values * texel[2] = blue values * texel[3] = alpha values */ static void lp_build_sample_texel_soa(struct lp_build_sample_context *bld, unsigned unit, LLVMValueRef width, LLVMValueRef height, LLVMValueRef depth, LLVMValueRef x, LLVMValueRef y, LLVMValueRef z, LLVMValueRef y_stride, LLVMValueRef z_stride, LLVMValueRef data_ptr, LLVMValueRef texel_out[4]) { const struct lp_sampler_static_state *static_state = bld->static_state; const unsigned dims = bld->dims; struct lp_build_context *int_coord_bld = &bld->int_coord_bld; LLVMBuilderRef builder = bld->gallivm->builder; LLVMValueRef offset; LLVMValueRef i, j; LLVMValueRef use_border = NULL; /* use_border = x < 0 || x >= width || y < 0 || y >= height */ if (lp_sampler_wrap_mode_uses_border_color(static_state->wrap_s, static_state->min_img_filter, static_state->mag_img_filter)) { LLVMValueRef b1, b2; b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, x, int_coord_bld->zero); b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, x, width); use_border = LLVMBuildOr(builder, b1, b2, "b1_or_b2"); } if (dims >= 2 && lp_sampler_wrap_mode_uses_border_color(static_state->wrap_t, static_state->min_img_filter, static_state->mag_img_filter)) { LLVMValueRef b1, b2; b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, y, int_coord_bld->zero); b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, y, height); if (use_border) { use_border = LLVMBuildOr(builder, use_border, b1, "ub_or_b1"); use_border = LLVMBuildOr(builder, use_border, b2, "ub_or_b2"); } else { use_border = LLVMBuildOr(builder, b1, b2, "b1_or_b2"); } } if (dims == 3 && lp_sampler_wrap_mode_uses_border_color(static_state->wrap_r, static_state->min_img_filter, static_state->mag_img_filter)) { LLVMValueRef b1, b2; b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, z, int_coord_bld->zero); b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, z, depth); if (use_border) { use_border = LLVMBuildOr(builder, use_border, b1, "ub_or_b1"); use_border = LLVMBuildOr(builder, use_border, b2, "ub_or_b2"); } else { use_border = LLVMBuildOr(builder, b1, b2, "b1_or_b2"); } } /* convert x,y,z coords to linear offset from start of texture, in bytes */ lp_build_sample_offset(&bld->int_coord_bld, bld->format_desc, x, y, z, y_stride, z_stride, &offset, &i, &j); if (use_border) { /* If we can sample the border color, it means that texcoords may * lie outside the bounds of the texture image. We need to do * something to prevent reading out of bounds and causing a segfault. * * Simply AND the texture coords with !use_border. This will cause * coords which are out of bounds to become zero. Zero's guaranteed * to be inside the texture image. */ offset = lp_build_andnot(&bld->int_coord_bld, offset, use_border); } lp_build_fetch_rgba_soa(bld->gallivm, bld->format_desc, bld->texel_type, data_ptr, offset, i, j, texel_out); /* * Note: if we find an app which frequently samples the texture border * we might want to implement a true conditional here to avoid sampling * the texture whenever possible (since that's quite a bit of code). * Ex: * if (use_border) { * texel = border_color; * } * else { * texel = sample_texture(coord); * } * As it is now, we always sample the texture, then selectively replace * the texel color results with the border color. */ if (use_border) { /* select texel color or border color depending on use_border */ LLVMValueRef border_color_ptr = bld->dynamic_state->border_color(bld->dynamic_state, bld->gallivm, unit); int chan; for (chan = 0; chan < 4; chan++) { LLVMValueRef border_chan = lp_build_array_get(bld->gallivm, border_color_ptr, lp_build_const_int32(bld->gallivm, chan)); LLVMValueRef border_chan_vec = lp_build_broadcast_scalar(&bld->float_vec_bld, border_chan); texel_out[chan] = lp_build_select(&bld->texel_bld, use_border, border_chan_vec, texel_out[chan]); } } } /** * Helper to compute the mirror function for the PIPE_WRAP_MIRROR modes. */ static LLVMValueRef lp_build_coord_mirror(struct lp_build_sample_context *bld, LLVMValueRef coord) { struct lp_build_context *coord_bld = &bld->coord_bld; struct lp_build_context *int_coord_bld = &bld->int_coord_bld; LLVMValueRef fract, flr, isOdd; lp_build_ifloor_fract(coord_bld, coord, &flr, &fract); /* isOdd = flr & 1 */ isOdd = LLVMBuildAnd(bld->gallivm->builder, flr, int_coord_bld->one, ""); /* make coord positive or negative depending on isOdd */ coord = lp_build_set_sign(coord_bld, fract, isOdd); /* convert isOdd to float */ isOdd = lp_build_int_to_float(coord_bld, isOdd); /* add isOdd to coord */ coord = lp_build_add(coord_bld, coord, isOdd); return coord; } /** * Build LLVM code for texture wrap mode for linear filtering. * \param x0_out returns first integer texcoord * \param x1_out returns second integer texcoord * \param weight_out returns linear interpolation weight */ static void lp_build_sample_wrap_linear(struct lp_build_sample_context *bld, LLVMValueRef coord, LLVMValueRef length, LLVMValueRef length_f, boolean is_pot, unsigned wrap_mode, LLVMValueRef *x0_out, LLVMValueRef *x1_out, LLVMValueRef *weight_out) { struct lp_build_context *coord_bld = &bld->coord_bld; struct lp_build_context *int_coord_bld = &bld->int_coord_bld; LLVMBuilderRef builder = bld->gallivm->builder; LLVMValueRef half = lp_build_const_vec(bld->gallivm, coord_bld->type, 0.5); LLVMValueRef length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one); LLVMValueRef coord0, coord1, weight; switch(wrap_mode) { case PIPE_TEX_WRAP_REPEAT: /* mul by size and subtract 0.5 */ coord = lp_build_mul(coord_bld, coord, length_f); coord = lp_build_sub(coord_bld, coord, half); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight); /* repeat wrap */ if (is_pot) { coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); coord0 = LLVMBuildAnd(builder, coord0, length_minus_one, ""); coord1 = LLVMBuildAnd(builder, coord1, length_minus_one, ""); } else { /* Add a bias to the texcoord to handle negative coords */ LLVMValueRef bias = lp_build_mul_imm(int_coord_bld, length, 1024); LLVMValueRef mask; coord0 = LLVMBuildAdd(builder, coord0, bias, ""); coord0 = LLVMBuildURem(builder, coord0, length, ""); mask = lp_build_compare(bld->gallivm, int_coord_bld->type, PIPE_FUNC_NOTEQUAL, coord0, length_minus_one); coord1 = LLVMBuildAnd(builder, lp_build_add(int_coord_bld, coord0, int_coord_bld->one), mask, ""); } break; case PIPE_TEX_WRAP_CLAMP: if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* clamp to [0, length] */ coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, length_f); coord = lp_build_sub(coord_bld, coord, half); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); break; case PIPE_TEX_WRAP_CLAMP_TO_EDGE: { struct lp_build_context abs_coord_bld = bld->coord_bld; abs_coord_bld.type.sign = FALSE; if (bld->static_state->normalized_coords) { /* mul by tex size */ coord = lp_build_mul(coord_bld, coord, length_f); } /* clamp to length max */ coord = lp_build_min(coord_bld, coord, length_f); /* subtract 0.5 */ coord = lp_build_sub(coord_bld, coord, half); /* clamp to [0, length - 0.5] */ coord = lp_build_max(coord_bld, coord, coord_bld->zero); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(&abs_coord_bld, coord, &coord0, &weight); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); /* coord1 = min(coord1, length-1) */ coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one); break; } case PIPE_TEX_WRAP_CLAMP_TO_BORDER: { LLVMValueRef min; if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* was: clamp to [-0.5, length + 0.5], then sub 0.5 */ coord = lp_build_sub(coord_bld, coord, half); min = lp_build_const_vec(bld->gallivm, coord_bld->type, -1.0F); coord = lp_build_clamp(coord_bld, coord, min, length_f); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); } break; case PIPE_TEX_WRAP_MIRROR_REPEAT: /* compute mirror function */ coord = lp_build_coord_mirror(bld, coord); /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); coord = lp_build_sub(coord_bld, coord, half); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); /* coord0 = max(coord0, 0) */ coord0 = lp_build_max(int_coord_bld, coord0, int_coord_bld->zero); /* coord1 = min(coord1, length-1) */ coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one); break; case PIPE_TEX_WRAP_MIRROR_CLAMP: coord = lp_build_abs(coord_bld, coord); if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* clamp to [0, length] */ coord = lp_build_min(coord_bld, coord, length_f); coord = lp_build_sub(coord_bld, coord, half); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); break; case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE: { LLVMValueRef min, max; struct lp_build_context abs_coord_bld = bld->coord_bld; abs_coord_bld.type.sign = FALSE; coord = lp_build_abs(coord_bld, coord); if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* clamp to [0.5, length - 0.5] */ min = half; max = lp_build_sub(coord_bld, length_f, min); coord = lp_build_clamp(coord_bld, coord, min, max); coord = lp_build_sub(coord_bld, coord, half); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(&abs_coord_bld, coord, &coord0, &weight); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); } break; case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER: { coord = lp_build_abs(coord_bld, coord); if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* was: clamp to [-0.5, length + 0.5] then sub 0.5 */ /* skip -0.5 clamp (always positive), do sub first */ coord = lp_build_sub(coord_bld, coord, half); coord = lp_build_min(coord_bld, coord, length_f); /* convert to int, compute lerp weight */ lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); } break; default: assert(0); coord0 = NULL; coord1 = NULL; weight = NULL; } *x0_out = coord0; *x1_out = coord1; *weight_out = weight; } /** * Build LLVM code for texture wrap mode for nearest filtering. * \param coord the incoming texcoord (nominally in [0,1]) * \param length the texture size along one dimension, as int vector * \param is_pot if TRUE, length is a power of two * \param wrap_mode one of PIPE_TEX_WRAP_x */ static LLVMValueRef lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld, LLVMValueRef coord, LLVMValueRef length, LLVMValueRef length_f, boolean is_pot, unsigned wrap_mode) { struct lp_build_context *coord_bld = &bld->coord_bld; struct lp_build_context *int_coord_bld = &bld->int_coord_bld; LLVMBuilderRef builder = bld->gallivm->builder; LLVMValueRef length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one); LLVMValueRef icoord; switch(wrap_mode) { case PIPE_TEX_WRAP_REPEAT: coord = lp_build_mul(coord_bld, coord, length_f); icoord = lp_build_ifloor(coord_bld, coord); if (is_pot) icoord = LLVMBuildAnd(builder, icoord, length_minus_one, ""); else { /* Add a bias to the texcoord to handle negative coords */ LLVMValueRef bias = lp_build_mul_imm(int_coord_bld, length, 1024); icoord = LLVMBuildAdd(builder, icoord, bias, ""); icoord = LLVMBuildURem(builder, icoord, length, ""); } break; case PIPE_TEX_WRAP_CLAMP: case PIPE_TEX_WRAP_CLAMP_TO_EDGE: if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* floor */ /* use itrunc instead since we clamp to 0 anyway */ icoord = lp_build_itrunc(coord_bld, coord); /* clamp to [0, length - 1]. */ icoord = lp_build_clamp(int_coord_bld, icoord, int_coord_bld->zero, length_minus_one); break; case PIPE_TEX_WRAP_CLAMP_TO_BORDER: /* Note: this is the same as CLAMP_TO_EDGE, except min = -min */ { LLVMValueRef min, max; if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } icoord = lp_build_ifloor(coord_bld, coord); /* clamp to [-1, length] */ min = lp_build_negate(int_coord_bld, int_coord_bld->one); max = length; icoord = lp_build_clamp(int_coord_bld, icoord, min, max); } break; case PIPE_TEX_WRAP_MIRROR_REPEAT: /* compute mirror function */ coord = lp_build_coord_mirror(bld, coord); /* scale coord to length */ assert(bld->static_state->normalized_coords); coord = lp_build_mul(coord_bld, coord, length_f); /* itrunc == ifloor here */ icoord = lp_build_itrunc(coord_bld, coord); /* clamp to [0, length - 1] */ icoord = lp_build_min(int_coord_bld, icoord, length_minus_one); break; case PIPE_TEX_WRAP_MIRROR_CLAMP: case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE: coord = lp_build_abs(coord_bld, coord); if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* itrunc == ifloor here */ icoord = lp_build_itrunc(coord_bld, coord); /* clamp to [0, length - 1] */ icoord = lp_build_min(int_coord_bld, icoord, length_minus_one); break; case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER: coord = lp_build_abs(coord_bld, coord); if (bld->static_state->normalized_coords) { /* scale coord to length */ coord = lp_build_mul(coord_bld, coord, length_f); } /* itrunc == ifloor here */ icoord = lp_build_itrunc(coord_bld, coord); /* clamp to [0, length] */ icoord = lp_build_min(int_coord_bld, icoord, length); break; default: assert(0); icoord = NULL; } return icoord; } /** * Generate code to sample a mipmap level with nearest filtering. * If sampling a cube texture, r = cube face in [0,5]. */ static void lp_build_sample_image_nearest(struct lp_build_sample_context *bld, unsigned unit, LLVMValueRef size, LLVMValueRef row_stride_vec, LLVMValueRef img_stride_vec, LLVMValueRef data_ptr, LLVMValueRef s, LLVMValueRef t, LLVMValueRef r, LLVMValueRef colors_out[4]) { const unsigned dims = bld->dims; LLVMValueRef width_vec; LLVMValueRef height_vec; LLVMValueRef depth_vec; LLVMValueRef flt_size; LLVMValueRef flt_width_vec; LLVMValueRef flt_height_vec; LLVMValueRef flt_depth_vec; LLVMValueRef x, y, z; lp_build_extract_image_sizes(bld, bld->int_size_type, bld->int_coord_type, size, &width_vec, &height_vec, &depth_vec); flt_size = lp_build_int_to_float(&bld->float_size_bld, size); lp_build_extract_image_sizes(bld, bld->float_size_type, bld->coord_type, flt_size, &flt_width_vec, &flt_height_vec, &flt_depth_vec); /* * Compute integer texcoords. */ x = lp_build_sample_wrap_nearest(bld, s, width_vec, flt_width_vec, bld->static_state->pot_width, bld->static_state->wrap_s); lp_build_name(x, "tex.x.wrapped"); if (dims >= 2) { y = lp_build_sample_wrap_nearest(bld, t, height_vec, flt_height_vec, bld->static_state->pot_height, bld->static_state->wrap_t); lp_build_name(y, "tex.y.wrapped"); if (dims == 3) { z = lp_build_sample_wrap_nearest(bld, r, depth_vec, flt_depth_vec, bld->static_state->pot_depth, bld->static_state->wrap_r); lp_build_name(z, "tex.z.wrapped"); } else if (bld->static_state->target == PIPE_TEXTURE_CUBE) { z = r; } else { z = NULL; } } else { y = z = NULL; } /* * Get texture colors. */ lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x, y, z, row_stride_vec, img_stride_vec, data_ptr, colors_out); } /** * Generate code to sample a mipmap level with linear filtering. * If sampling a cube texture, r = cube face in [0,5]. */ static void lp_build_sample_image_linear(struct lp_build_sample_context *bld, unsigned unit, LLVMValueRef size, LLVMValueRef row_stride_vec, LLVMValueRef img_stride_vec, LLVMValueRef data_ptr, LLVMValueRef s, LLVMValueRef t, LLVMValueRef r, LLVMValueRef colors_out[4]) { const unsigned dims = bld->dims; LLVMValueRef width_vec; LLVMValueRef height_vec; LLVMValueRef depth_vec; LLVMValueRef flt_size; LLVMValueRef flt_width_vec; LLVMValueRef flt_height_vec; LLVMValueRef flt_depth_vec; LLVMValueRef x0, y0, z0, x1, y1, z1; LLVMValueRef s_fpart, t_fpart, r_fpart; LLVMValueRef neighbors[2][2][4]; int chan; lp_build_extract_image_sizes(bld, bld->int_size_type, bld->int_coord_type, size, &width_vec, &height_vec, &depth_vec); flt_size = lp_build_int_to_float(&bld->float_size_bld, size); lp_build_extract_image_sizes(bld, bld->float_size_type, bld->coord_type, flt_size, &flt_width_vec, &flt_height_vec, &flt_depth_vec); /* * Compute integer texcoords. */ lp_build_sample_wrap_linear(bld, s, width_vec, flt_width_vec, bld->static_state->pot_width, bld->static_state->wrap_s, &x0, &x1, &s_fpart); lp_build_name(x0, "tex.x0.wrapped"); lp_build_name(x1, "tex.x1.wrapped"); if (dims >= 2) { lp_build_sample_wrap_linear(bld, t, height_vec, flt_height_vec, bld->static_state->pot_height, bld->static_state->wrap_t, &y0, &y1, &t_fpart); lp_build_name(y0, "tex.y0.wrapped"); lp_build_name(y1, "tex.y1.wrapped"); if (dims == 3) { lp_build_sample_wrap_linear(bld, r, depth_vec, flt_depth_vec, bld->static_state->pot_depth, bld->static_state->wrap_r, &z0, &z1, &r_fpart); lp_build_name(z0, "tex.z0.wrapped"); lp_build_name(z1, "tex.z1.wrapped"); } else if (bld->static_state->target == PIPE_TEXTURE_CUBE) { z0 = z1 = r; /* cube face */ r_fpart = NULL; } else { z0 = z1 = NULL; r_fpart = NULL; } } else { y0 = y1 = t_fpart = NULL; z0 = z1 = r_fpart = NULL; } /* * Get texture colors. */ /* get x0/x1 texels */ lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x0, y0, z0, row_stride_vec, img_stride_vec, data_ptr, neighbors[0][0]); lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x1, y0, z0, row_stride_vec, img_stride_vec, data_ptr, neighbors[0][1]); if (dims == 1) { /* Interpolate two samples from 1D image to produce one color */ for (chan = 0; chan < 4; chan++) { colors_out[chan] = lp_build_lerp(&bld->texel_bld, s_fpart, neighbors[0][0][chan], neighbors[0][1][chan]); } } else { /* 2D/3D texture */ LLVMValueRef colors0[4]; /* get x0/x1 texels at y1 */ lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x0, y1, z0, row_stride_vec, img_stride_vec, data_ptr, neighbors[1][0]); lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x1, y1, z0, row_stride_vec, img_stride_vec, data_ptr, neighbors[1][1]); /* Bilinear interpolate the four samples from the 2D image / 3D slice */ for (chan = 0; chan < 4; chan++) { colors0[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]); } if (dims == 3) { LLVMValueRef neighbors1[2][2][4]; LLVMValueRef colors1[4]; /* get x0/x1/y0/y1 texels at z1 */ lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x0, y0, z1, row_stride_vec, img_stride_vec, data_ptr, neighbors1[0][0]); lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x1, y0, z1, row_stride_vec, img_stride_vec, data_ptr, neighbors1[0][1]); lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x0, y1, z1, row_stride_vec, img_stride_vec, data_ptr, neighbors1[1][0]); lp_build_sample_texel_soa(bld, unit, width_vec, height_vec, depth_vec, x1, y1, z1, row_stride_vec, img_stride_vec, data_ptr, neighbors1[1][1]); /* Bilinear interpolate the four samples from the second Z slice */ for (chan = 0; chan < 4; chan++) { colors1[chan] = lp_build_lerp_2d(&bld->texel_bld, s_fpart, t_fpart, neighbors1[0][0][chan], neighbors1[0][1][chan], neighbors1[1][0][chan], neighbors1[1][1][chan]); } /* Linearly interpolate the two samples from the two 3D slices */ for (chan = 0; chan < 4; chan++) { colors_out[chan] = lp_build_lerp(&bld->texel_bld, r_fpart, colors0[chan], colors1[chan]); } } else { /* 2D tex */ for (chan = 0; chan < 4; chan++) { colors_out[chan] = colors0[chan]; } } } } /** * Sample the texture/mipmap using given image filter and mip filter. * data0_ptr and data1_ptr point to the two mipmap levels to sample * from. width0/1_vec, height0/1_vec, depth0/1_vec indicate their sizes. * If we're using nearest miplevel sampling the '1' values will be null/unused. */ static void lp_build_sample_mipmap(struct lp_build_sample_context *bld, unsigned unit, unsigned img_filter, unsigned mip_filter, LLVMValueRef s, LLVMValueRef t, LLVMValueRef r, LLVMValueRef ilevel0, LLVMValueRef ilevel1, LLVMValueRef lod_fpart, LLVMValueRef *colors_out) { LLVMBuilderRef builder = bld->gallivm->builder; LLVMValueRef size0 = NULL; LLVMValueRef size1 = NULL; LLVMValueRef row_stride0_vec = NULL; LLVMValueRef row_stride1_vec = NULL; LLVMValueRef img_stride0_vec = NULL; LLVMValueRef img_stride1_vec = NULL; LLVMValueRef data_ptr0 = NULL; LLVMValueRef data_ptr1 = NULL; LLVMValueRef colors0[4], colors1[4]; unsigned chan; /* sample the first mipmap level */ lp_build_mipmap_level_sizes(bld, ilevel0, &size0, &row_stride0_vec, &img_stride0_vec); data_ptr0 = lp_build_get_mipmap_level(bld, ilevel0); if (img_filter == PIPE_TEX_FILTER_NEAREST) { lp_build_sample_image_nearest(bld, unit, size0, row_stride0_vec, img_stride0_vec, data_ptr0, s, t, r, colors0); } else { assert(img_filter == PIPE_TEX_FILTER_LINEAR); lp_build_sample_image_linear(bld, unit, size0, row_stride0_vec, img_stride0_vec, data_ptr0, s, t, r, colors0); } /* Store the first level's colors in the output variables */ for (chan = 0; chan < 4; chan++) { LLVMBuildStore(builder, colors0[chan], colors_out[chan]); } if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) { struct lp_build_if_state if_ctx; LLVMValueRef need_lerp; /* need_lerp = lod_fpart > 0 */ need_lerp = LLVMBuildFCmp(builder, LLVMRealUGT, lod_fpart, bld->float_bld.zero, "need_lerp"); lp_build_if(&if_ctx, bld->gallivm, need_lerp); { /* sample the second mipmap level */ lp_build_mipmap_level_sizes(bld, ilevel1, &size1, &row_stride1_vec, &img_stride1_vec); data_ptr1 = lp_build_get_mipmap_level(bld, ilevel1); if (img_filter == PIPE_TEX_FILTER_NEAREST) { lp_build_sample_image_nearest(bld, unit, size1, row_stride1_vec, img_stride1_vec, data_ptr1, s, t, r, colors1); } else { lp_build_sample_image_linear(bld, unit, size1, row_stride1_vec, img_stride1_vec, data_ptr1, s, t, r, colors1); } /* interpolate samples from the two mipmap levels */ lod_fpart = lp_build_broadcast_scalar(&bld->texel_bld, lod_fpart); for (chan = 0; chan < 4; chan++) { colors0[chan] = lp_build_lerp(&bld->texel_bld, lod_fpart, colors0[chan], colors1[chan]); LLVMBuildStore(builder, colors0[chan], colors_out[chan]); } } lp_build_endif(&if_ctx); } } /** * General texture sampling codegen. * This function handles texture sampling for all texture targets (1D, * 2D, 3D, cube) and all filtering modes. */ static void lp_build_sample_general(struct lp_build_sample_context *bld, unsigned unit, LLVMValueRef s, LLVMValueRef t, LLVMValueRef r, const LLVMValueRef *ddx, const LLVMValueRef *ddy, LLVMValueRef lod_bias, /* optional */ LLVMValueRef explicit_lod, /* optional */ LLVMValueRef *colors_out) { struct lp_build_context *int_bld = &bld->int_bld; LLVMBuilderRef builder = bld->gallivm->builder; const unsigned mip_filter = bld->static_state->min_mip_filter; const unsigned min_filter = bld->static_state->min_img_filter; const unsigned mag_filter = bld->static_state->mag_img_filter; LLVMValueRef lod_ipart = NULL, lod_fpart = NULL; LLVMValueRef ilevel0, ilevel1 = NULL; LLVMValueRef face_ddx[4], face_ddy[4]; LLVMValueRef texels[4]; LLVMValueRef first_level; LLVMValueRef i32t_zero = lp_build_const_int32(bld->gallivm, 0); unsigned chan; /* printf("%s mip %d min %d mag %d\n", __FUNCTION__, mip_filter, min_filter, mag_filter); */ /* * Choose cube face, recompute texcoords and derivatives for the chosen face. */ if (bld->static_state->target == PIPE_TEXTURE_CUBE) { LLVMValueRef face, face_s, face_t; lp_build_cube_lookup(bld, s, t, r, &face, &face_s, &face_t); s = face_s; /* vec */ t = face_t; /* vec */ /* use 'r' to indicate cube face */ r = lp_build_broadcast_scalar(&bld->int_coord_bld, face); /* vec */ /* recompute ddx, ddy using the new (s,t) face texcoords */ face_ddx[0] = lp_build_scalar_ddx(&bld->coord_bld, s); face_ddx[1] = lp_build_scalar_ddx(&bld->coord_bld, t); face_ddx[2] = NULL; face_ddx[3] = NULL; face_ddy[0] = lp_build_scalar_ddy(&bld->coord_bld, s); face_ddy[1] = lp_build_scalar_ddy(&bld->coord_bld, t); face_ddy[2] = NULL; face_ddy[3] = NULL; ddx = face_ddx; ddy = face_ddy; } /* * Compute the level of detail (float). */ if (min_filter != mag_filter || mip_filter != PIPE_TEX_MIPFILTER_NONE) { /* Need to compute lod either to choose mipmap levels or to * distinguish between minification/magnification with one mipmap level. */ lp_build_lod_selector(bld, unit, ddx, ddy, lod_bias, explicit_lod, mip_filter, &lod_ipart, &lod_fpart); } else { lod_ipart = i32t_zero; } /* * Compute integer mipmap level(s) to fetch texels from: ilevel0, ilevel1 */ switch (mip_filter) { default: assert(0 && "bad mip_filter value in lp_build_sample_soa()"); /* fall-through */ case PIPE_TEX_MIPFILTER_NONE: /* always use mip level 0 */ if (bld->static_state->target == PIPE_TEXTURE_CUBE) { /* XXX this is a work-around for an apparent bug in LLVM 2.7. * We should be able to set ilevel0 = const(0) but that causes * bad x86 code to be emitted. */ assert(lod_ipart); lp_build_nearest_mip_level(bld, unit, lod_ipart, &ilevel0); } else { first_level = bld->dynamic_state->first_level(bld->dynamic_state, bld->gallivm, unit); ilevel0 = first_level; } break; case PIPE_TEX_MIPFILTER_NEAREST: assert(lod_ipart); lp_build_nearest_mip_level(bld, unit, lod_ipart, &ilevel0); break; case PIPE_TEX_MIPFILTER_LINEAR: assert(lod_ipart); assert(lod_fpart); lp_build_linear_mip_levels(bld, unit, lod_ipart, &lod_fpart, &ilevel0, &ilevel1); break; } /* * Get/interpolate texture colors. */ for (chan = 0; chan < 4; ++chan) { texels[chan] = lp_build_alloca(bld->gallivm, bld->texel_bld.vec_type, ""); lp_build_name(texels[chan], "sampler%u_texel_%c_var", unit, "xyzw"[chan]); } if (min_filter == mag_filter) { /* no need to distinquish between minification and magnification */ lp_build_sample_mipmap(bld, unit, min_filter, mip_filter, s, t, r, ilevel0, ilevel1, lod_fpart, texels); } else { /* Emit conditional to choose min image filter or mag image filter * depending on the lod being > 0 or <= 0, respectively. */ struct lp_build_if_state if_ctx; LLVMValueRef minify; /* minify = lod >= 0.0 */ minify = LLVMBuildICmp(builder, LLVMIntSGE, lod_ipart, int_bld->zero, ""); lp_build_if(&if_ctx, bld->gallivm, minify); { /* Use the minification filter */ lp_build_sample_mipmap(bld, unit, min_filter, mip_filter, s, t, r, ilevel0, ilevel1, lod_fpart, texels); } lp_build_else(&if_ctx); { /* Use the magnification filter */ lp_build_sample_mipmap(bld, unit, mag_filter, PIPE_TEX_MIPFILTER_NONE, s, t, r, ilevel0, NULL, NULL, texels); } lp_build_endif(&if_ctx); } for (chan = 0; chan < 4; ++chan) { colors_out[chan] = LLVMBuildLoad(builder, texels[chan], ""); lp_build_name(colors_out[chan], "sampler%u_texel_%c", unit, "xyzw"[chan]); } } /** * Do shadow test/comparison. * \param p the texcoord Z (aka R, aka P) component * \param texel the texel to compare against (use the X channel) */ static void lp_build_sample_compare(struct lp_build_sample_context *bld, LLVMValueRef p, LLVMValueRef texel[4]) { struct lp_build_context *texel_bld = &bld->texel_bld; LLVMBuilderRef builder = bld->gallivm->builder; LLVMValueRef res; const unsigned chan = 0; if (bld->static_state->compare_mode == PIPE_TEX_COMPARE_NONE) return; /* debug code */ if (0) { LLVMValueRef indx = lp_build_const_int32(bld->gallivm, 0); LLVMValueRef coord = LLVMBuildExtractElement(builder, p, indx, ""); LLVMValueRef tex = LLVMBuildExtractElement(builder, texel[chan], indx, ""); lp_build_printf(bld->gallivm, "shadow compare coord %f to texture %f\n", coord, tex); } /* Clamp p coords to [0,1] */ p = lp_build_clamp(&bld->coord_bld, p, bld->coord_bld.zero, bld->coord_bld.one); /* result = (p FUNC texel) ? 1 : 0 */ res = lp_build_cmp(texel_bld, bld->static_state->compare_func, p, texel[chan]); res = lp_build_select(texel_bld, res, texel_bld->one, texel_bld->zero); /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */ texel[0] = texel[1] = texel[2] = res; texel[3] = texel_bld->one; } /** * Just set texels to white instead of actually sampling the texture. * For debugging. */ void lp_build_sample_nop(struct gallivm_state *gallivm, struct lp_type type, LLVMValueRef texel_out[4]) { LLVMValueRef one = lp_build_one(gallivm, type); unsigned chan; for (chan = 0; chan < 4; chan++) { texel_out[chan] = one; } } /** * Build texture sampling code. * 'texel' will return a vector of four LLVMValueRefs corresponding to * R, G, B, A. * \param type vector float type to use for coords, etc. * \param ddx partial derivatives of (s,t,r,q) with respect to x * \param ddy partial derivatives of (s,t,r,q) with respect to y */ void lp_build_sample_soa(struct gallivm_state *gallivm, 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, const LLVMValueRef ddx[4], const LLVMValueRef ddy[4], LLVMValueRef lod_bias, /* optional */ LLVMValueRef explicit_lod, /* optional */ LLVMValueRef texel_out[4]) { unsigned dims = texture_dims(static_state->target); struct lp_build_sample_context bld; LLVMTypeRef i32t = LLVMInt32TypeInContext(gallivm->context); LLVMBuilderRef builder = gallivm->builder; LLVMValueRef s; LLVMValueRef t; LLVMValueRef r; struct lp_type float_vec_type; if (0) { enum pipe_format fmt = static_state->format; debug_printf("Sample from %s\n", util_format_name(fmt)); } assert(type.floating); /* Setup our build context */ memset(&bld, 0, sizeof bld); bld.gallivm = gallivm; bld.static_state = static_state; bld.dynamic_state = dynamic_state; bld.format_desc = util_format_description(static_state->format); bld.dims = dims; bld.float_type = lp_type_float(32); bld.int_type = lp_type_int(32); bld.coord_type = type; bld.int_coord_type = lp_int_type(type); bld.float_size_type = lp_type_float(32); bld.float_size_type.length = dims > 1 ? 4 : 1; bld.int_size_type = lp_int_type(bld.float_size_type); bld.texel_type = type; float_vec_type = lp_type_float_vec(32); lp_build_context_init(&bld.float_bld, gallivm, bld.float_type); lp_build_context_init(&bld.float_vec_bld, gallivm, float_vec_type); lp_build_context_init(&bld.int_bld, gallivm, bld.int_type); lp_build_context_init(&bld.coord_bld, gallivm, bld.coord_type); lp_build_context_init(&bld.int_coord_bld, gallivm, bld.int_coord_type); lp_build_context_init(&bld.int_size_bld, gallivm, bld.int_size_type); lp_build_context_init(&bld.float_size_bld, gallivm, bld.float_size_type); lp_build_context_init(&bld.texel_bld, gallivm, bld.texel_type); /* Get the dynamic state */ bld.width = dynamic_state->width(dynamic_state, gallivm, unit); bld.height = dynamic_state->height(dynamic_state, gallivm, unit); bld.depth = dynamic_state->depth(dynamic_state, gallivm, unit); bld.row_stride_array = dynamic_state->row_stride(dynamic_state, gallivm, unit); bld.img_stride_array = dynamic_state->img_stride(dynamic_state, gallivm, unit); bld.data_array = dynamic_state->data_ptr(dynamic_state, gallivm, unit); /* Note that data_array is an array[level] of pointers to texture images */ s = coords[0]; t = coords[1]; r = coords[2]; /* width, height, depth as single int vector */ if (dims <= 1) { bld.int_size = bld.width; } else { bld.int_size = LLVMBuildInsertElement(builder, bld.int_size_bld.undef, bld.width, LLVMConstInt(i32t, 0, 0), ""); if (dims >= 2) { bld.int_size = LLVMBuildInsertElement(builder, bld.int_size, bld.height, LLVMConstInt(i32t, 1, 0), ""); if (dims >= 3) { bld.int_size = LLVMBuildInsertElement(builder, bld.int_size, bld.depth, LLVMConstInt(i32t, 2, 0), ""); } } } if (0) { /* For debug: no-op texture sampling */ lp_build_sample_nop(gallivm, bld.texel_type, texel_out); } else if (util_format_fits_8unorm(bld.format_desc) && lp_is_simple_wrap_mode(static_state->wrap_s) && lp_is_simple_wrap_mode(static_state->wrap_t)) { /* do sampling/filtering with fixed pt arithmetic */ lp_build_sample_aos(&bld, unit, s, t, r, ddx, ddy, lod_bias, explicit_lod, texel_out); } else { if ((gallivm_debug & GALLIVM_DEBUG_PERF) && util_format_fits_8unorm(bld.format_desc)) { debug_printf("%s: using floating point linear filtering for %s\n", __FUNCTION__, bld.format_desc->short_name); debug_printf(" min_img %d mag_img %d mip %d wraps %d wrapt %d\n", static_state->min_img_filter, static_state->mag_img_filter, static_state->min_mip_filter, static_state->wrap_s, static_state->wrap_t); } lp_build_sample_general(&bld, unit, s, t, r, ddx, ddy, lod_bias, explicit_lod, texel_out); } lp_build_sample_compare(&bld, r, texel_out); apply_sampler_swizzle(&bld, texel_out); }