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 #include "i915_resource.h"
  36
  37
  38 /*
  39  * A note about min_lod & max_lod.
  40  *
  41  * There is a circular dependancy between the sampler state
  42  * and the map state to be submitted to hw.
  43  *
  44  * Two condition must be meet:
  45  * min_lod =< max_lod == true
  46  * max_lod =< last_level == true
  47  *
  48  *
  49  * This is all fine and dandy if it where for the fact that max_lod
  50  * is set on the map state instead of the sampler state. That is
  51  * the max_lod we submit on map is:
  52  * max_lod = MIN2(last_level, max_lod);
  53  *
  54  * So we need to update the map state when we change samplers and
  55  * we need to be change the sampler state when map state is changed.
  56  * The first part is done by calling i915_update_texture in
  57  * i915_update_samplers and the second part is done else where in
  58  * code tracking the state changes.
  59  */
  60
  61 static void
  62 i915_update_texture(struct i915_context *i915,
  63                     uint unit,
  64                     const struct i915_texture *tex,
  65                     const struct i915_sampler_state *sampler,
  66                     uint state[6]);
  67 /**
  68  * Compute i915 texture sampling state.
  69  *
  70  * Recalculate all state from scratch.  Perhaps not the most
  71  * efficient, but this has gotten complex enough that we need
  72  * something which is understandable and reliable.
  73  * \param state  returns the 3 words of compute state
  74  */
  75 static void update_sampler(struct i915_context *i915,
  76                            uint unit,
  77                            const struct i915_sampler_state *sampler,
  78                            const struct i915_texture *tex,
  79                            unsigned state[3] )
  80 {
  81    const struct pipe_resource *pt = &tex->b.b;
  82    unsigned minlod, lastlod;
  83
  84    /* Need to do this after updating the maps, which call the
  85     * intel_finalize_mipmap_tree and hence can update firstLevel:
  86     */
  87    state[0] = sampler->state[0];
  88    state[1] = sampler->state[1];
  89    state[2] = sampler->state[2];
  90
  91    if (pt->format == PIPE_FORMAT_UYVY ||
  92        pt->format == PIPE_FORMAT_YUYV)
  93       state[0] |= SS2_COLORSPACE_CONVERSION;
  94
  95    /* 3D textures don't seem to respect the border color.
  96     * Fallback if there's ever a danger that they might refer to
  97     * it.
  98     *
  99     * Effectively this means fallback on 3D clamp or
 100     * clamp_to_border.
 101     *
 102     * XXX: Check if this is true on i945.
 103     * XXX: Check if this bug got fixed in release silicon.
 104     */
 105 #if 0
 106    {
 107       const unsigned ws = sampler->templ->wrap_s;
 108       const unsigned wt = sampler->templ->wrap_t;
 109       const unsigned wr = sampler->templ->wrap_r;
 110       if (pt->target == PIPE_TEXTURE_3D &&
 111           (sampler->templ->min_img_filter != PIPE_TEX_FILTER_NEAREST ||
 112            sampler->templ->mag_img_filter != PIPE_TEX_FILTER_NEAREST) &&
 113           (ws == PIPE_TEX_WRAP_CLAMP ||
 114            wt == PIPE_TEX_WRAP_CLAMP ||
 115            wr == PIPE_TEX_WRAP_CLAMP ||
 116            ws == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 117            wt == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 118            wr == PIPE_TEX_WRAP_CLAMP_TO_BORDER)) {
 119          if (i915->conformance_mode > 0) {
 120             assert(0);
 121             /*      sampler->fallback = true; */
 122             /* TODO */
 123          }
 124       }
 125    }
 126 #endif
 127
 128    /* See note at the top of file */
 129    minlod = sampler->minlod;
 130    lastlod = pt->last_level << 4;
 131
 132    if (lastlod < minlod) {
 133       minlod = lastlod;
 134    }
 135
 136    state[1] |= (sampler->minlod << SS3_MIN_LOD_SHIFT);
 137    state[1] |= (unit << SS3_TEXTUREMAP_INDEX_SHIFT);
 138 }
 139
 140
 141 void i915_update_samplers( struct i915_context *i915 )
 142 {
 143    uint unit;
 144
 145    i915->current.sampler_enable_nr = 0;
 146    i915->current.sampler_enable_flags = 0x0;
 147
 148    for (unit = 0; unit < i915->num_fragment_sampler_views && unit < i915->num_samplers;
 149         unit++) {
 150       /* determine unit enable/disable by looking for a bound texture */
 151       /* could also examine the fragment program? */
 152       if (i915->fragment_sampler_views[unit]) {
 153          struct i915_texture *texture = i915_texture(i915->fragment_sampler_views[unit]->texture);
 154
 155          update_sampler( i915,
 156                          unit,
 157                          i915->sampler[unit],       /* sampler state */
 158                          texture,                    /* texture */
 159                          i915->current.sampler[unit] /* the result */
 160                          );
 161          i915_update_texture( i915,
 162                               unit,
 163                               texture,                      /* texture */
 164                               i915->sampler[unit],          /* sampler state */
 165                               i915->current.texbuffer[unit] );
 166
 167          i915->current.sampler_enable_nr++;
 168          i915->current.sampler_enable_flags |= (1 << unit);
 169       }
 170    }
 171
 172    i915->hardware_dirty |= I915_HW_SAMPLER | I915_HW_MAP;
 173 }
 174
 175
 176 static uint
 177 translate_texture_format(enum pipe_format pipeFormat)
 178 {
 179    switch (pipeFormat) {
 180    case PIPE_FORMAT_L8_UNORM:
 181       return MAPSURF_8BIT | MT_8BIT_L8;
 182    case PIPE_FORMAT_I8_UNORM:
 183       return MAPSURF_8BIT | MT_8BIT_I8;
 184    case PIPE_FORMAT_A8_UNORM:
 185       return MAPSURF_8BIT | MT_8BIT_A8;
 186    case PIPE_FORMAT_L8A8_UNORM:
 187       return MAPSURF_16BIT | MT_16BIT_AY88;
 188    case PIPE_FORMAT_B5G6R5_UNORM:
 189       return MAPSURF_16BIT | MT_16BIT_RGB565;
 190    case PIPE_FORMAT_B5G5R5A1_UNORM:
 191       return MAPSURF_16BIT | MT_16BIT_ARGB1555;
 192    case PIPE_FORMAT_B4G4R4A4_UNORM:
 193       return MAPSURF_16BIT | MT_16BIT_ARGB4444;
 194    case PIPE_FORMAT_B8G8R8A8_UNORM:
 195       return MAPSURF_32BIT | MT_32BIT_ARGB8888;
 196    case PIPE_FORMAT_B8G8R8X8_UNORM:
 197       return MAPSURF_32BIT | MT_32BIT_XRGB8888;
 198    case PIPE_FORMAT_R8G8B8A8_UNORM:
 199       return MAPSURF_32BIT | MT_32BIT_ABGR8888;
 200 #if 0
 201    case PIPE_FORMAT_R8G8B8X8_UNORM:
 202       return MAPSURF_32BIT | MT_32BIT_XBGR8888;
 203 #endif
 204    case PIPE_FORMAT_YUYV:
 205       return (MAPSURF_422 | MT_422_YCRCB_NORMAL);
 206    case PIPE_FORMAT_UYVY:
 207       return (MAPSURF_422 | MT_422_YCRCB_SWAPY);
 208 #if 0
 209    case PIPE_FORMAT_RGB_FXT1:
 210    case PIPE_FORMAT_RGBA_FXT1:
 211       return (MAPSURF_COMPRESSED | MT_COMPRESS_FXT1);
 212 #endif
 213    case PIPE_FORMAT_Z16_UNORM:
 214       return (MAPSURF_16BIT | MT_16BIT_L16);
 215 #if 0
 216    case PIPE_FORMAT_RGBA_DXT1:
 217    case PIPE_FORMAT_RGB_DXT1:
 218       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT1);
 219    case PIPE_FORMAT_RGBA_DXT3:
 220       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT2_3);
 221    case PIPE_FORMAT_RGBA_DXT5:
 222       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT4_5);
 223 #endif
 224    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 225       return (MAPSURF_32BIT | MT_32BIT_xI824);
 226    default:
 227       debug_printf("i915: translate_texture_format() bad image format %x\n",
 228               pipeFormat);
 229       assert(0);
 230       return 0;
 231    }
 232 }
 233
 234
 235 static void
 236 i915_update_texture(struct i915_context *i915,
 237                     uint unit,
 238                     const struct i915_texture *tex,
 239                     const struct i915_sampler_state *sampler,
 240                     uint state[6])
 241 {
 242    const struct pipe_resource *pt = &tex->b.b;
 243    uint format, pitch;
 244    const uint width = pt->width0, height = pt->height0, depth = pt->depth0;
 245    const uint num_levels = pt->last_level;
 246    unsigned max_lod = num_levels * 4;
 247    unsigned tiled = MS3_USE_FENCE_REGS;
 248
 249    assert(tex);
 250    assert(width);
 251    assert(height);
 252    assert(depth);
 253
 254    format = translate_texture_format(pt->format);
 255    pitch = tex->stride;
 256
 257    assert(format);
 258    assert(pitch);
 259
 260    if (tex->sw_tiled) {
 261       assert(!((pitch - 1) & pitch));
 262       tiled = MS3_TILED_SURFACE;
 263    }
 264
 265    /* MS3 state */
 266    state[0] =
 267       (((height - 1) << MS3_HEIGHT_SHIFT)
 268        | ((width - 1) << MS3_WIDTH_SHIFT)
 269        | format
 270        | tiled);
 271
 272    /*
 273     * XXX When min_filter != mag_filter and there's just one mipmap level,
 274     * set max_lod = 1 to make sure i915 chooses between min/mag filtering.
 275     */
 276
 277    /* See note at the top of file */
 278    if (max_lod > (sampler->maxlod >> 2))
 279       max_lod = sampler->maxlod >> 2;
 280
 281    /* MS4 state */
 282    state[1] =
 283       ((((pitch / 4) - 1) << MS4_PITCH_SHIFT)
 284        | MS4_CUBE_FACE_ENA_MASK
 285        | ((max_lod) << MS4_MAX_LOD_SHIFT)
 286        | ((depth - 1) << MS4_VOLUME_DEPTH_SHIFT));
 287 }
 288
 289
 290 void
 291 i915_update_textures(struct i915_context *i915)
 292 {
 293    uint unit;
 294
 295    for (unit = 0; unit < i915->num_fragment_sampler_views && unit < i915->num_samplers;
 296         unit++) {
 297       /* determine unit enable/disable by looking for a bound texture */
 298       /* could also examine the fragment program? */
 299       if (i915->fragment_sampler_views[unit]) {
 300          struct i915_texture *texture = i915_texture(i915->fragment_sampler_views[unit]->texture);
 301
 302          i915_update_texture( i915,
 303                               unit,
 304                               texture,                      /* texture */
 305                               i915->sampler[unit],          /* sampler state */
 306                               i915->current.texbuffer[unit] );
 307       }
 308    }
 309
 310    i915->hardware_dirty |= I915_HW_MAP;
 311 }