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
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  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
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  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 #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 update_texture in update_samplers
  57  * and the second part is done else where in code tracking the state
  58  * changes.
  59  */
  60
  61 static void update_map(struct i915_context *i915,
  62                        uint unit,
  63                        const struct i915_texture *tex,
  64                        const struct i915_sampler_state *sampler,
  65                        uint state[2]);
  66
  67
  68
  69 /***********************************************************************
  70  * Samplers
  71  */
  72
  73 /**
  74  * Compute i915 texture sampling state.
  75  *
  76  * Recalculate all state from scratch.  Perhaps not the most
  77  * efficient, but this has gotten complex enough that we need
  78  * something which is understandable and reliable.
  79  * \param state  returns the 3 words of compute state
  80  */
  81 static void update_sampler(struct i915_context *i915,
  82                            uint unit,
  83                            const struct i915_sampler_state *sampler,
  84                            const struct i915_texture *tex,
  85                            unsigned state[3])
  86 {
  87    const struct pipe_resource *pt = &tex->b.b;
  88    unsigned minlod, lastlod;
  89
  90    state[0] = sampler->state[0];
  91    state[1] = sampler->state[1];
  92    state[2] = sampler->state[2];
  93
  94    if (pt->format == PIPE_FORMAT_UYVY ||
  95        pt->format == PIPE_FORMAT_YUYV)
  96       state[0] |= SS2_COLORSPACE_CONVERSION;
  97
  98    /* 3D textures don't seem to respect the border color.
  99     * Fallback if there's ever a danger that they might refer to
 100     * it.
 101     *
 102     * Effectively this means fallback on 3D clamp or
 103     * clamp_to_border.
 104     *
 105     * XXX: Check if this is true on i945.
 106     * XXX: Check if this bug got fixed in release silicon.
 107     */
 108 #if 0
 109    {
 110       const unsigned ws = sampler->templ->wrap_s;
 111       const unsigned wt = sampler->templ->wrap_t;
 112       const unsigned wr = sampler->templ->wrap_r;
 113       if (pt->target == PIPE_TEXTURE_3D &&
 114           (sampler->templ->min_img_filter != PIPE_TEX_FILTER_NEAREST ||
 115            sampler->templ->mag_img_filter != PIPE_TEX_FILTER_NEAREST) &&
 116           (ws == PIPE_TEX_WRAP_CLAMP ||
 117            wt == PIPE_TEX_WRAP_CLAMP ||
 118            wr == PIPE_TEX_WRAP_CLAMP ||
 119            ws == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 120            wt == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 121            wr == PIPE_TEX_WRAP_CLAMP_TO_BORDER)) {
 122          if (i915->conformance_mode > 0) {
 123             assert(0);
 124             /*             sampler->fallback = true; */
 125             /* TODO */
 126          }
 127       }
 128    }
 129 #endif
 130
 131    /* See note at the top of file */
 132    minlod = sampler->minlod;
 133    lastlod = pt->last_level << 4;
 134
 135    if (lastlod < minlod) {
 136       minlod = lastlod;
 137    }
 138
 139    state[1] |= (sampler->minlod << SS3_MIN_LOD_SHIFT);
 140    state[1] |= (unit << SS3_TEXTUREMAP_INDEX_SHIFT);
 141 }
 142
 143 static void update_samplers(struct i915_context *i915)
 144 {
 145    uint unit;
 146
 147    i915->current.sampler_enable_nr = 0;
 148    i915->current.sampler_enable_flags = 0x0;
 149
 150    for (unit = 0; unit < i915->num_fragment_sampler_views && unit < i915->num_samplers;
 151         unit++) {
 152       /* determine unit enable/disable by looking for a bound texture */
 153       /* could also examine the fragment program? */
 154       if (i915->fragment_sampler_views[unit]) {
 155          struct i915_texture *texture = i915_texture(i915->fragment_sampler_views[unit]->texture);
 156
 157          update_sampler(i915,
 158                         unit,
 159                         i915->sampler[unit],          /* sampler state */
 160                         texture,                      /* texture */
 161                         i915->current.sampler[unit]); /* the result */
 162          update_map(i915,
 163                     unit,
 164                     texture,                        /* texture */
 165                     i915->sampler[unit],            /* sampler state */
 166                     i915->current.texbuffer[unit]); /* the result */
 167
 168          i915->current.sampler_enable_nr++;
 169          i915->current.sampler_enable_flags |= (1 << unit);
 170       }
 171    }
 172
 173    i915->hardware_dirty |= I915_HW_SAMPLER | I915_HW_MAP;
 174 }
 175
 176 struct i915_tracked_state i915_hw_samplers = {
 177    "samplers",
 178    update_samplers,
 179    I915_NEW_SAMPLER | I915_NEW_SAMPLER_VIEW
 180 };
 181
 182
 183
 184 /***********************************************************************
 185  * Sampler views
 186  */
 187
 188 static uint translate_texture_format(enum pipe_format pipeFormat)
 189 {
 190    switch (pipeFormat) {
 191    case PIPE_FORMAT_L8_UNORM:
 192       return MAPSURF_8BIT | MT_8BIT_L8;
 193    case PIPE_FORMAT_I8_UNORM:
 194       return MAPSURF_8BIT | MT_8BIT_I8;
 195    case PIPE_FORMAT_A8_UNORM:
 196       return MAPSURF_8BIT | MT_8BIT_A8;
 197    case PIPE_FORMAT_L8A8_UNORM:
 198       return MAPSURF_16BIT | MT_16BIT_AY88;
 199    case PIPE_FORMAT_B5G6R5_UNORM:
 200       return MAPSURF_16BIT | MT_16BIT_RGB565;
 201    case PIPE_FORMAT_B5G5R5A1_UNORM:
 202       return MAPSURF_16BIT | MT_16BIT_ARGB1555;
 203    case PIPE_FORMAT_B4G4R4A4_UNORM:
 204       return MAPSURF_16BIT | MT_16BIT_ARGB4444;
 205    case PIPE_FORMAT_B8G8R8A8_UNORM:
 206       return MAPSURF_32BIT | MT_32BIT_ARGB8888;
 207    case PIPE_FORMAT_B8G8R8X8_UNORM:
 208       return MAPSURF_32BIT | MT_32BIT_XRGB8888;
 209    case PIPE_FORMAT_R8G8B8A8_UNORM:
 210       return MAPSURF_32BIT | MT_32BIT_ABGR8888;
 211    case PIPE_FORMAT_R8G8B8X8_UNORM:
 212       return MAPSURF_32BIT | MT_32BIT_XBGR8888;
 213    case PIPE_FORMAT_YUYV:
 214       return (MAPSURF_422 | MT_422_YCRCB_NORMAL);
 215    case PIPE_FORMAT_UYVY:
 216       return (MAPSURF_422 | MT_422_YCRCB_SWAPY);
 217 #if 0
 218    case PIPE_FORMAT_RGB_FXT1:
 219    case PIPE_FORMAT_RGBA_FXT1:
 220       return (MAPSURF_COMPRESSED | MT_COMPRESS_FXT1);
 221 #endif
 222    case PIPE_FORMAT_Z16_UNORM:
 223       return (MAPSURF_16BIT | MT_16BIT_L16);
 224    case PIPE_FORMAT_DXT1_RGBA:
 225    case PIPE_FORMAT_DXT1_RGB:
 226       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT1);
 227    case PIPE_FORMAT_DXT3_RGBA:
 228       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT2_3);
 229    case PIPE_FORMAT_DXT5_RGBA:
 230       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT4_5);
 231    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 232    case PIPE_FORMAT_Z24X8_UNORM:
 233       return (MAPSURF_32BIT | MT_32BIT_xI824);
 234    default:
 235       debug_printf("i915: translate_texture_format() bad image format %x\n",
 236                    pipeFormat);
 237       assert(0);
 238       return 0;
 239    }
 240 }
 241
 242 static inline uint32_t
 243 ms3_tiling_bits(enum i915_winsys_buffer_tile tiling)
 244 {
 245          uint32_t tiling_bits = 0;
 246
 247          switch (tiling) {
 248          case I915_TILE_Y:
 249             tiling_bits |= MS3_TILE_WALK_Y;
 250          case I915_TILE_X:
 251             tiling_bits |= MS3_TILED_SURFACE;
 252          case I915_TILE_NONE:
 253             break;
 254          }
 255
 256          return tiling_bits;
 257 }
 258
 259 static void update_map(struct i915_context *i915,
 260                        uint unit,
 261                        const struct i915_texture *tex,
 262                        const struct i915_sampler_state *sampler,
 263                        uint state[2])
 264 {
 265    const struct pipe_resource *pt = &tex->b.b;
 266    uint format, pitch;
 267    const uint width = pt->width0, height = pt->height0, depth = pt->depth0;
 268    const uint num_levels = pt->last_level;
 269    unsigned max_lod = num_levels * 4;
 270
 271    assert(tex);
 272    assert(width);
 273    assert(height);
 274    assert(depth);
 275
 276    format = translate_texture_format(pt->format);
 277    pitch = tex->stride;
 278
 279    assert(format);
 280    assert(pitch);
 281
 282    /* MS3 state */
 283    state[0] =
 284       (((height - 1) << MS3_HEIGHT_SHIFT)
 285        | ((width - 1) << MS3_WIDTH_SHIFT)
 286        | format
 287        | ms3_tiling_bits(tex->tiling));
 288
 289    /*
 290     * XXX When min_filter != mag_filter and there's just one mipmap level,
 291     * set max_lod = 1 to make sure i915 chooses between min/mag filtering.
 292     */
 293
 294    /* See note at the top of file */
 295    if (max_lod > (sampler->maxlod >> 2))
 296       max_lod = sampler->maxlod >> 2;
 297
 298    /* MS4 state */
 299    state[1] =
 300       ((((pitch / 4) - 1) << MS4_PITCH_SHIFT)
 301        | MS4_CUBE_FACE_ENA_MASK
 302        | ((max_lod) << MS4_MAX_LOD_SHIFT)
 303        | ((depth - 1) << MS4_VOLUME_DEPTH_SHIFT));
 304 }
 305
 306 static void update_maps(struct i915_context *i915)
 307 {
 308    uint unit;
 309
 310    for (unit = 0; unit < i915->num_fragment_sampler_views && unit < i915->num_samplers;
 311         unit++) {
 312       /* determine unit enable/disable by looking for a bound texture */
 313       /* could also examine the fragment program? */
 314       if (i915->fragment_sampler_views[unit]) {
 315          struct i915_texture *texture = i915_texture(i915->fragment_sampler_views[unit]->texture);
 316
 317          update_map(i915,
 318                     unit,
 319                     texture,                      /* texture */
 320                     i915->sampler[unit],          /* sampler state */
 321                     i915->current.texbuffer[unit]);
 322       }
 323    }
 324
 325    i915->hardware_dirty |= I915_HW_MAP;
 326 }
 327
 328 struct i915_tracked_state i915_hw_sampler_views = {
 329    "sampler_views",
 330    update_maps,
 331    I915_NEW_SAMPLER_VIEW
 332 };