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
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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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  26  **************************************************************************/
  27
  28 #include "pipe/p_context.h"
  29 #include "pipe/p_state.h"
  30 #include "util/u_memory.h"
  31
  32 #include "i915_state_inlines.h"
  33 #include "i915_context.h"
  34 #include "i915_reg.h"
  35 #include "i915_state.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_texture *pt = &tex->base;
  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_YCBCR ||
  92        pt->format == PIPE_FORMAT_YCBCR_REV)
  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_textures && 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->texture[unit]) {
 153          update_sampler( i915,
 154                          unit,
 155                          i915->sampler[unit],       /* sampler state */
 156                          i915->texture[unit],        /* texture */
 157                          i915->current.sampler[unit] /* the result */
 158                          );
 159          i915_update_texture( i915,
 160                               unit,
 161                               i915->texture[unit],          /* texture */
 162                               i915->sampler[unit],          /* sampler state */
 163                               i915->current.texbuffer[unit] );
 164
 165          i915->current.sampler_enable_nr++;
 166          i915->current.sampler_enable_flags |= (1 << unit);
 167       }
 168    }
 169
 170    i915->hardware_dirty |= I915_HW_SAMPLER | I915_HW_MAP;
 171 }
 172
 173
 174 static uint
 175 translate_texture_format(enum pipe_format pipeFormat)
 176 {
 177    switch (pipeFormat) {
 178    case PIPE_FORMAT_L8_UNORM:
 179       return MAPSURF_8BIT | MT_8BIT_L8;
 180    case PIPE_FORMAT_I8_UNORM:
 181       return MAPSURF_8BIT | MT_8BIT_I8;
 182    case PIPE_FORMAT_A8_UNORM:
 183       return MAPSURF_8BIT | MT_8BIT_A8;
 184    case PIPE_FORMAT_A8L8_UNORM:
 185       return MAPSURF_16BIT | MT_16BIT_AY88;
 186    case PIPE_FORMAT_R5G6B5_UNORM:
 187       return MAPSURF_16BIT | MT_16BIT_RGB565;
 188    case PIPE_FORMAT_A1R5G5B5_UNORM:
 189       return MAPSURF_16BIT | MT_16BIT_ARGB1555;
 190    case PIPE_FORMAT_A4R4G4B4_UNORM:
 191       return MAPSURF_16BIT | MT_16BIT_ARGB4444;
 192    case PIPE_FORMAT_A8R8G8B8_UNORM:
 193       return MAPSURF_32BIT | MT_32BIT_ARGB8888;
 194    case PIPE_FORMAT_YCBCR_REV:
 195       return (MAPSURF_422 | MT_422_YCRCB_NORMAL);
 196    case PIPE_FORMAT_YCBCR:
 197       return (MAPSURF_422 | MT_422_YCRCB_SWAPY);
 198 #if 0
 199    case PIPE_FORMAT_RGB_FXT1:
 200    case PIPE_FORMAT_RGBA_FXT1:
 201       return (MAPSURF_COMPRESSED | MT_COMPRESS_FXT1);
 202 #endif
 203    case PIPE_FORMAT_Z16_UNORM:
 204       return (MAPSURF_16BIT | MT_16BIT_L16);
 205 #if 0
 206    case PIPE_FORMAT_RGBA_DXT1:
 207    case PIPE_FORMAT_RGB_DXT1:
 208       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT1);
 209    case PIPE_FORMAT_RGBA_DXT3:
 210       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT2_3);
 211    case PIPE_FORMAT_RGBA_DXT5:
 212       return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT4_5);
 213 #endif
 214    case PIPE_FORMAT_S8Z24_UNORM:
 215       return (MAPSURF_32BIT | MT_32BIT_xI824);
 216    default:
 217       debug_printf("i915: translate_texture_format() bad image format %x\n",
 218               pipeFormat);
 219       assert(0);
 220       return 0;
 221    }
 222 }
 223
 224
 225 static void
 226 i915_update_texture(struct i915_context *i915,
 227                     uint unit,
 228                     const struct i915_texture *tex,
 229                     const struct i915_sampler_state *sampler,
 230                     uint state[6])
 231 {
 232    const struct pipe_texture *pt = &tex->base;
 233    uint format, pitch;
 234    const uint width = pt->width0, height = pt->height0, depth = pt->depth0;
 235    const uint num_levels = pt->last_level;
 236    unsigned max_lod = num_levels * 4;
 237    unsigned tiled = MS3_USE_FENCE_REGS;
 238
 239    assert(tex);
 240    assert(width);
 241    assert(height);
 242    assert(depth);
 243
 244    format = translate_texture_format(pt->format);
 245    pitch = tex->stride;
 246
 247    assert(format);
 248    assert(pitch);
 249
 250    if (tex->sw_tiled) {
 251       assert(!((pitch - 1) & pitch));
 252       tiled = MS3_TILED_SURFACE;
 253    }
 254
 255    /* MS3 state */
 256    state[0] =
 257       (((height - 1) << MS3_HEIGHT_SHIFT)
 258        | ((width - 1) << MS3_WIDTH_SHIFT)
 259        | format
 260        | tiled);
 261
 262    /*
 263     * XXX When min_filter != mag_filter and there's just one mipmap level,
 264     * set max_lod = 1 to make sure i915 chooses between min/mag filtering.
 265     */
 266
 267    /* See note at the top of file */
 268    if (max_lod > (sampler->maxlod >> 2))
 269       max_lod = sampler->maxlod >> 2;
 270
 271    /* MS4 state */
 272    state[1] =
 273       ((((pitch / 4) - 1) << MS4_PITCH_SHIFT)
 274        | MS4_CUBE_FACE_ENA_MASK
 275        | ((max_lod) << MS4_MAX_LOD_SHIFT)
 276        | ((depth - 1) << MS4_VOLUME_DEPTH_SHIFT));
 277 }
 278
 279
 280 void
 281 i915_update_textures(struct i915_context *i915)
 282 {
 283    uint unit;
 284
 285    for (unit = 0; unit < i915->num_textures && unit < i915->num_samplers;
 286         unit++) {
 287       /* determine unit enable/disable by looking for a bound texture */
 288       /* could also examine the fragment program? */
 289       if (i915->texture[unit]) {
 290          i915_update_texture( i915,
 291                               unit,
 292                               i915->texture[unit],          /* texture */
 293                               i915->sampler[unit],          /* sampler state */
 294                               i915->current.texbuffer[unit] );
 295       }
 296    }
 297
 298    i915->hardware_dirty |= I915_HW_MAP;
 299 }