src/gallium/drivers/i915/i915_state_sampler.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   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
   8  * "Software"), to deal in the Software without restriction, including
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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 TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "pipe/p_context.h"
  29 #include "pipe/p_state.h"
  30
  31 #include "i915_state_inlines.h"
  32 #include "i915_context.h"
  33 #include "i915_reg.h"
  34 #include "i915_state.h"
  35
  36
  37 /*
  38  * A note about min_lod & max_lod.
  39  *
  40  * There is a circular dependancy between the sampler state
  41  * and the map state to be submitted to hw.
  42  *
  43  * Two condition must be meet:
  44  * min_lod =< max_lod == true
  45  * max_lod =< last_level == true
  46  *
  47  *
  48  * This is all fine and dandy if it where for the fact that max_lod
  49  * is set on the map state instead of the sampler state. That is
  50  * the max_lod we submit on map is:
  51  * max_lod = MIN2(last_level, max_lod);
  52  *
  53  * So we need to update the map state when we change samplers and
  54  * we need to be change the sampler state when map state is changed.
  55  * The first part is done by calling i915_update_texture in
  56  * i915_update_samplers and the second part is done else where in
  57  * code tracking the state changes.
  58  */
  59
  60 static void
  61 i915_update_texture(struct i915_context *i915,
  62                     uint unit,
  63                     const struct i915_texture *tex,
  64                     const struct i915_sampler_state *sampler,
  65                     uint state[6]);
  66 /**
  67  * Compute i915 texture sampling state.
  68  *
  69  * Recalculate all state from scratch.  Perhaps not the most
  70  * efficient, but this has gotten complex enough that we need
  71  * something which is understandable and reliable.
  72  * \param state  returns the 3 words of compute state
  73  */
  74 static void update_sampler(struct i915_context *i915,
  75                            uint unit,
  76                            const struct i915_sampler_state *sampler,
  77                            const struct i915_texture *tex,
  78                            unsigned state[3] )
  79 {
  80    const struct pipe_texture *pt = &tex->base;
  81    unsigned minlod, lastlod;
  82
  83    /* Need to do this after updating the maps, which call the
  84     * intel_finalize_mipmap_tree and hence can update firstLevel:
  85     */
  86    state[0] = sampler->state[0];
  87    state[1] = sampler->state[1];
  88    state[2] = sampler->state[2];
  89
  90    if (pt->format == PIPE_FORMAT_YCBCR ||
  91        pt->format == PIPE_FORMAT_YCBCR_REV)
  92       state[0] |= SS2_COLORSPACE_CONVERSION;
  93
  94    /* 3D textures don't seem to respect the border color.
  95     * Fallback if there's ever a danger that they might refer to
  96     * it.
  97     *
  98     * Effectively this means fallback on 3D clamp or
  99     * clamp_to_border.
 100     *
 101     * XXX: Check if this is true on i945.
 102     * XXX: Check if this bug got fixed in release silicon.
 103     */
 104 #if 0
 105    {
 106       const unsigned ws = sampler->templ->wrap_s;
 107       const unsigned wt = sampler->templ->wrap_t;
 108       const unsigned wr = sampler->templ->wrap_r;
 109       if (pt->target == PIPE_TEXTURE_3D &&
 110           (sampler->templ->min_img_filter != PIPE_TEX_FILTER_NEAREST ||
 111            sampler->templ->mag_img_filter != PIPE_TEX_FILTER_NEAREST) &&
 112           (ws == PIPE_TEX_WRAP_CLAMP ||
 113            wt == PIPE_TEX_WRAP_CLAMP ||
 114            wr == PIPE_TEX_WRAP_CLAMP ||
 115            ws == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 116            wt == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 117            wr == PIPE_TEX_WRAP_CLAMP_TO_BORDER)) {
 118          if (i915->conformance_mode > 0) {
 119             assert(0);
 120             /*      sampler->fallback = true; */
 121             /* TODO */
 122          }
 123       }
 124    }
 125 #endif
 126
 127    /* See note at the top of file */
 128    minlod = sampler->minlod;
 129    lastlod = pt->last_level << 4;
 130
 131    if (lastlod < minlod) {
 132       minlod = lastlod;
 133    }
 134
 135    state[1] |= (sampler->minlod << SS3_MIN_LOD_SHIFT);
 136    state[1] |= (unit << SS3_TEXTUREMAP_INDEX_SHIFT);
 137 }
 138
 139
 140 void i915_update_samplers( struct i915_context *i915 )
 141 {
 142    uint unit;
 143
 144    i915->current.sampler_enable_nr = 0;
 145    i915->current.sampler_enable_flags = 0x0;
 146
 147    for (unit = 0; unit < i915->num_textures && unit < i915->num_samplers;
 148         unit++) {
 149       /* determine unit enable/disable by looking for a bound texture */
 150       /* could also examine the fragment program? */
 151       if (i915->texture[unit]) {
 152          update_sampler( i915,
 153                          unit,
 154                          i915->sampler[unit],       /* sampler state */
 155                          i915->texture[unit],        /* texture */
 156                          i915->current.sampler[unit] /* the result */
 157                          );
 158          i915_update_texture( i915,
 159                               unit,
 160                               i915->texture[unit],          /* texture */
 161                               i915->sampler[unit],          /* sampler state */
 162                               i915->current.texbuffer[unit] );
 163
 164          i915->current.sampler_enable_nr++;
 165          i915->current.sampler_enable_flags |= (1 << unit);
 166       }
 167    }
 168
 169    i915->hardware_dirty |= I915_HW_SAMPLER | I915_HW_MAP;
 170 }
 171
 172
 173 static uint
 174 translate_texture_format(enum pipe_format pipeFormat)
 175 {
 176    switch (pipeFormat) {
 177    case PIPE_FORMAT_L8_UNORM:
 178       return MAPSURF_8BIT | MT_8BIT_L8;
 179    case PIPE_FORMAT_I8_UNORM:
 180       return MAPSURF_8BIT | MT_8BIT_I8;
 181    case PIPE_FORMAT_A8_UNORM:
 182       return MAPSURF_8BIT | MT_8BIT_A8;
 183    case PIPE_FORMAT_A8L8_UNORM:
 184       return MAPSURF_16BIT | MT_16BIT_AY88;
 185    case PIPE_FORMAT_R5G6B5_UNORM:
 186       return MAPSURF_16BIT | MT_16BIT_RGB565;
 187    case PIPE_FORMAT_A1R5G5B5_UNORM:
 188       return MAPSURF_16BIT | MT_16BIT_ARGB1555;
 189    case PIPE_FORMAT_A4R4G4B4_UNORM:
 190       return MAPSURF_16BIT | MT_16BIT_ARGB4444;
 191    case PIPE_FORMAT_A8R8G8B8_UNORM:
 192       return MAPSURF_32BIT | MT_32BIT_ARGB8888;
 193    case PIPE_FORMAT_YCBCR_REV:
 194       return (MAPSURF_422 | MT_422_YCRCB_NORMAL);
 195    case PIPE_FORMAT_YCBCR:
 196       return (MAPSURF_422 | MT_422_YCRCB_SWAPY);
 197 #if 0
 198    case PIPE_FORMAT_RGB_FXT1:
 199    case PIPE_FORMAT_RGBA_FXT1:
 200       return (MAPSURF_COMPRESSED | MT_COMPRESS_FXT1);
 201 #endif
 202    case PIPE_FORMAT_Z16_UNORM:
 203       return (MAPSURF_16BIT | MT_16BIT_L16);
 204 #if 0
 205    case PIPE_FORMAT_RGBA_DXT1:
 206    case PIPE_FORMAT_RGB_DXT1:
 207       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT1);
 208    case PIPE_FORMAT_RGBA_DXT3:
 209       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT2_3);
 210    case PIPE_FORMAT_RGBA_DXT5:
 211       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT4_5);
 212 #endif
 213    case PIPE_FORMAT_S8Z24_UNORM:
 214       return (MAPSURF_32BIT | MT_32BIT_xI824);
 215    default:
 216       debug_printf("i915: translate_texture_format() bad image format %x\n",
 217               pipeFormat);
 218       assert(0);
 219       return 0;
 220    }
 221 }
 222
 223
 224 static void
 225 i915_update_texture(struct i915_context *i915,
 226                     uint unit,
 227                     const struct i915_texture *tex,
 228                     const struct i915_sampler_state *sampler,
 229                     uint state[6])
 230 {
 231    const struct pipe_texture *pt = &tex->base;
 232    uint format, pitch;
 233    const uint width = pt->width0, height = pt->height0, depth = pt->depth0;
 234    const uint num_levels = pt->last_level;
 235    unsigned max_lod = num_levels * 4;
 236    unsigned tiled = MS3_USE_FENCE_REGS;
 237
 238    assert(tex);
 239    assert(width);
 240    assert(height);
 241    assert(depth);
 242
 243    format = translate_texture_format(pt->format);
 244    pitch = tex->stride;
 245
 246    assert(format);
 247    assert(pitch);
 248
 249    if (tex->sw_tiled) {
 250       assert(!((pitch - 1) & pitch));
 251       tiled = MS3_TILED_SURFACE;
 252    }
 253
 254    /* MS3 state */
 255    state[0] =
 256       (((height - 1) << MS3_HEIGHT_SHIFT)
 257        | ((width - 1) << MS3_WIDTH_SHIFT)
 258        | format
 259        | tiled);
 260
 261    /*
 262     * XXX When min_filter != mag_filter and there's just one mipmap level,
 263     * set max_lod = 1 to make sure i915 chooses between min/mag filtering.
 264     */
 265
 266    /* See note at the top of file */
 267    if (max_lod > (sampler->maxlod >> 2))
 268       max_lod = sampler->maxlod >> 2;
 269
 270    /* MS4 state */
 271    state[1] =
 272       ((((pitch / 4) - 1) << MS4_PITCH_SHIFT)
 273        | MS4_CUBE_FACE_ENA_MASK
 274        | ((max_lod) << MS4_MAX_LOD_SHIFT)
 275        | ((depth - 1) << MS4_VOLUME_DEPTH_SHIFT));
 276 }
 277
 278
 279 void
 280 i915_update_textures(struct i915_context *i915)
 281 {
 282    uint unit;
 283
 284    for (unit = 0; unit < i915->num_textures && unit < i915->num_samplers;
 285         unit++) {
 286       /* determine unit enable/disable by looking for a bound texture */
 287       /* could also examine the fragment program? */
 288       if (i915->texture[unit]) {
 289          i915_update_texture( i915,
 290                               unit,
 291                               i915->texture[unit],          /* texture */
 292                               i915->sampler[unit],          /* sampler state */
 293                               i915->current.texbuffer[unit] );
 294       }
 295    }
 296
 297    i915->hardware_dirty |= I915_HW_MAP;
 298 }