src/gallium/auxiliary/gallivm/lp_bld_sample.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * @file
  30  * Texture sampling -- common code.
  31  *
  32  * @author Jose Fonseca <jfonseca@vmware.com>
  33  */
  34
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_state.h"
  37 #include "util/u_format.h"
  38 #include "util/u_math.h"
  39 #include "lp_bld_debug.h"
  40 #include "lp_bld_const.h"
  41 #include "lp_bld_arit.h"
  42 #include "lp_bld_type.h"
  43 #include "lp_bld_sample.h"
  44
  45
  46 /**
  47  * Initialize lp_sampler_static_state object with the gallium sampler
  48  * and texture state.
  49  * The former is considered to be static and the later dynamic.
  50  */
  51 void
  52 lp_sampler_static_state(struct lp_sampler_static_state *state,
  53                         const struct pipe_sampler_view *view,
  54                         const struct pipe_sampler_state *sampler)
  55 {
  56    const struct pipe_resource *texture = view->texture;
  57
  58    memset(state, 0, sizeof *state);
  59
  60    if(!texture)
  61       return;
  62
  63    if(!sampler)
  64       return;
  65
  66    /*
  67     * We don't copy sampler state over unless it is actually enabled, to avoid
  68     * spurious recompiles, as the sampler static state is part of the shader
  69     * key.
  70     *
  71     * Ideally the state tracker or cso_cache module would make all state
  72     * canonical, but until that happens it's better to be safe than sorry here.
  73     *
  74     * XXX: Actually there's much more than can be done here, especially
  75     * regarding 1D/2D/3D/CUBE textures, wrap modes, etc.
  76     */
  77
  78    state->format            = view->format;
  79    state->swizzle_r         = view->swizzle_r;
  80    state->swizzle_g         = view->swizzle_g;
  81    state->swizzle_b         = view->swizzle_b;
  82    state->swizzle_a         = view->swizzle_a;
  83
  84    state->target            = texture->target;
  85    state->pot_width         = util_is_power_of_two(texture->width0);
  86    state->pot_height        = util_is_power_of_two(texture->height0);
  87    state->pot_depth         = util_is_power_of_two(texture->depth0);
  88
  89    state->wrap_s            = sampler->wrap_s;
  90    state->wrap_t            = sampler->wrap_t;
  91    state->wrap_r            = sampler->wrap_r;
  92    state->min_img_filter    = sampler->min_img_filter;
  93    state->mag_img_filter    = sampler->mag_img_filter;
  94    if (view->last_level) {
  95       state->min_mip_filter = sampler->min_mip_filter;
  96    } else {
  97       state->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
  98    }
  99
 100    state->compare_mode      = sampler->compare_mode;
 101    if (sampler->compare_mode != PIPE_TEX_COMPARE_NONE) {
 102       state->compare_func   = sampler->compare_func;
 103    }
 104
 105    state->normalized_coords = sampler->normalized_coords;
 106    state->lod_bias          = sampler->lod_bias;
 107    if (!view->last_level &&
 108        sampler->min_img_filter == sampler->mag_img_filter) {
 109       state->min_lod        = 0.0f;
 110       state->max_lod        = 0.0f;
 111    } else {
 112       state->min_lod        = MAX2(sampler->min_lod, 0.0f);
 113       state->max_lod        = sampler->max_lod;
 114    }
 115    state->border_color[0]   = sampler->border_color[0];
 116    state->border_color[1]   = sampler->border_color[1];
 117    state->border_color[2]   = sampler->border_color[2];
 118    state->border_color[3]   = sampler->border_color[3];
 119
 120    /*
 121     * FIXME: Handle the remainder of pipe_sampler_view.
 122     */
 123 }
 124
 125
 126 /**
 127  * Compute the partial offset of a pixel block along an arbitrary axis.
 128  *
 129  * @param coord   coordinate in pixels
 130  * @param stride  number of bytes between rows of successive pixel blocks
 131  * @param block_length  number of pixels in a pixels block along the coordinate
 132  *                      axis
 133  * @param out_offset    resulting relative offset of the pixel block in bytes
 134  * @param out_subcoord  resulting sub-block pixel coordinate
 135  */
 136 void
 137 lp_build_sample_partial_offset(struct lp_build_context *bld,
 138                                unsigned block_length,
 139                                LLVMValueRef coord,
 140                                LLVMValueRef stride,
 141                                LLVMValueRef *out_offset,
 142                                LLVMValueRef *out_subcoord)
 143 {
 144    LLVMValueRef offset;
 145    LLVMValueRef subcoord;
 146
 147    if (block_length == 1) {
 148       subcoord = bld->zero;
 149    }
 150    else {
 151       /*
 152        * Pixel blocks have power of two dimensions. LLVM should convert the
 153        * rem/div to bit arithmetic.
 154        * TODO: Verify this.
 155        */
 156
 157       LLVMValueRef block_width = lp_build_const_int_vec(bld->type, block_length);
 158       subcoord = LLVMBuildURem(bld->builder, coord, block_width, "");
 159       coord    = LLVMBuildUDiv(bld->builder, coord, block_width, "");
 160    }
 161
 162    offset = lp_build_mul(bld, coord, stride);
 163
 164    assert(out_offset);
 165    assert(out_subcoord);
 166
 167    *out_offset = offset;
 168    *out_subcoord = subcoord;
 169 }
 170
 171
 172 /**
 173  * Compute the offset of a pixel block.
 174  *
 175  * x, y, z, y_stride, z_stride are vectors, and they refer to pixels.
 176  *
 177  * Returns the relative offset and i,j sub-block coordinates
 178  */
 179 void
 180 lp_build_sample_offset(struct lp_build_context *bld,
 181                        const struct util_format_description *format_desc,
 182                        LLVMValueRef x,
 183                        LLVMValueRef y,
 184                        LLVMValueRef z,
 185                        LLVMValueRef y_stride,
 186                        LLVMValueRef z_stride,
 187                        LLVMValueRef *out_offset,
 188                        LLVMValueRef *out_i,
 189                        LLVMValueRef *out_j)
 190 {
 191    LLVMValueRef x_stride;
 192    LLVMValueRef offset;
 193
 194    x_stride = lp_build_const_vec(bld->type, format_desc->block.bits/8);
 195
 196    lp_build_sample_partial_offset(bld,
 197                                   format_desc->block.width,
 198                                   x, x_stride,
 199                                   &offset, out_i);
 200
 201    if (y && y_stride) {
 202       LLVMValueRef y_offset;
 203       lp_build_sample_partial_offset(bld,
 204                                      format_desc->block.height,
 205                                      y, y_stride,
 206                                      &y_offset, out_j);
 207       offset = lp_build_add(bld, offset, y_offset);
 208    }
 209    else {
 210       *out_j = bld->zero;
 211    }
 212
 213    if (z && z_stride) {
 214       LLVMValueRef z_offset;
 215       LLVMValueRef k;
 216       lp_build_sample_partial_offset(bld,
 217                                      1, /* pixel blocks are always 2D */
 218                                      z, z_stride,
 219                                      &z_offset, &k);
 220       offset = lp_build_add(bld, offset, z_offset);
 221    }
 222
 223    *out_offset = offset;
 224 }