src/mesa/pipe/i915simple/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 "mtypes.h"
  29 //#include "enums.h"
  30 //#include "texformat.h"
  31 //#include "macros.h"
  32 //#include "dri_bufmgr.h"
  33
  34
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_state.h"
  37 #include "pipe/p_util.h"
  38
  39 #include "i915_state_inlines.h"
  40 #include "i915_context.h"
  41 #include "i915_reg.h"
  42 //#include "i915_cache.h"
  43
  44
  45
  46
  47
  48
  49 /* The i915 (and related graphics cores) do not support GL_CLAMP.  The
  50  * Intel drivers for "other operating systems" implement GL_CLAMP as
  51  * GL_CLAMP_TO_EDGE, so the same is done here.
  52  */
  53 static unsigned
  54 translate_wrap_mode(unsigned wrap)
  55 {
  56    switch (wrap) {
  57    case PIPE_TEX_WRAP_REPEAT:
  58       return TEXCOORDMODE_WRAP;
  59    case PIPE_TEX_WRAP_CLAMP:
  60       return TEXCOORDMODE_CLAMP_EDGE;   /* not quite correct */
  61    case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
  62       return TEXCOORDMODE_CLAMP_EDGE;
  63    case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
  64       return TEXCOORDMODE_CLAMP_BORDER;
  65 //   case PIPE_TEX_WRAP_MIRRORED_REPEAT:
  66 //      return TEXCOORDMODE_MIRROR;
  67    default:
  68       return TEXCOORDMODE_WRAP;
  69    }
  70 }
  71
  72 static unsigned translate_img_filter( unsigned filter )
  73 {
  74    switch (filter) {
  75    case PIPE_TEX_FILTER_NEAREST:
  76       return FILTER_NEAREST;
  77    case PIPE_TEX_FILTER_LINEAR:
  78       return FILTER_LINEAR;
  79    default:
  80       assert(0);
  81       return FILTER_NEAREST;
  82    }
  83 }
  84
  85 static unsigned translate_mip_filter( unsigned filter )
  86 {
  87    switch (filter) {
  88    case PIPE_TEX_MIPFILTER_NONE:
  89       return MIPFILTER_NONE;
  90    case PIPE_TEX_MIPFILTER_NEAREST:
  91       return MIPFILTER_NEAREST;
  92    case PIPE_TEX_FILTER_LINEAR:
  93       return MIPFILTER_LINEAR;
  94    default:
  95       assert(0);
  96       return MIPFILTER_NONE;
  97    }
  98 }
  99
 100 static unsigned translate_compare_func(unsigned func)
 101 {
 102    switch (func) {
 103    case PIPE_FUNC_NEVER:
 104    case PIPE_FUNC_LESS:
 105    case PIPE_FUNC_EQUAL:
 106    case PIPE_FUNC_LEQUAL:
 107    case PIPE_FUNC_GREATER:
 108    case PIPE_FUNC_NOTEQUAL:
 109    case PIPE_FUNC_GEQUAL:
 110    case PIPE_FUNC_ALWAYS:
 111       return 0;
 112    default:
 113       assert(0);
 114       return 0;
 115    }
 116 }
 117
 118
 119 static uint
 120 bitcount(uint k)
 121 {
 122    uint count = 0;
 123    while (k) {
 124       if (k & 1)
 125          count++;
 126       k = k >> 1;
 127    }
 128    return count;
 129 }
 130
 131
 132 static boolean
 133 is_power_of_two_texture(const struct pipe_mipmap_tree *mt)
 134 {
 135    if (bitcount(mt->width0) == 1 &&
 136        bitcount(mt->height0) == 1 &&
 137        bitcount(mt->depth0) == 1) {
 138       return 1;
 139    }
 140    else
 141       return 0;
 142 }
 143
 144
 145 /**
 146  * Compute i915 texture sampling state.
 147  *
 148  * Recalculate all state from scratch.  Perhaps not the most
 149  * efficient, but this has gotten complex enough that we need
 150  * something which is understandable and reliable.
 151  * \param state  returns the 3 words of compute state
 152  */
 153 static void update_sampler(struct i915_context *i915,
 154                            uint unit,
 155                            const struct pipe_sampler_state *sampler,
 156                            const struct pipe_mipmap_tree *mt,
 157                            const struct pipe_surface *surface,
 158                            unsigned state[3] )
 159 {
 160    const unsigned ws = sampler->wrap_s;
 161    const unsigned wt = sampler->wrap_t;
 162    const unsigned wr = sampler->wrap_r;
 163
 164    /* Need to do this after updating the maps, which call the
 165     * intel_finalize_mipmap_tree and hence can update firstLevel:
 166     */
 167    unsigned minFilt, magFilt;
 168    unsigned mipFilt;
 169
 170    state[0] = state[1] = state[2] = 0;
 171
 172    mipFilt = translate_mip_filter( sampler->min_mip_filter );
 173
 174    if (sampler->max_anisotropy > 1.0) {
 175       minFilt = FILTER_ANISOTROPIC;
 176       magFilt = FILTER_ANISOTROPIC;
 177    }
 178    else {
 179       minFilt = translate_img_filter( sampler->min_img_filter );
 180       magFilt = translate_img_filter( sampler->mag_img_filter );
 181    }
 182
 183    {
 184       int b = sampler->lod_bias * 16.0;
 185       b = CLAMP(b, -256, 255);
 186       state[0] |= ((b << SS2_LOD_BIAS_SHIFT) & SS2_LOD_BIAS_MASK);
 187    }
 188
 189    if (surface->format == PIPE_FORMAT_YCBCR ||
 190        surface->format == PIPE_FORMAT_YCBCR_REV)
 191       state[0] |= SS2_COLORSPACE_CONVERSION;
 192
 193
 194    /* Shadow:
 195     */
 196    if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE)
 197    {
 198       state[0] |= (SS2_SHADOW_ENABLE |
 199                    translate_compare_func(sampler->compare_func));
 200
 201       minFilt = FILTER_4X4_FLAT;
 202       magFilt = FILTER_4X4_FLAT;
 203    }
 204
 205    state[0] |= ((minFilt << SS2_MIN_FILTER_SHIFT) |
 206                 (mipFilt << SS2_MIP_FILTER_SHIFT) |
 207                 (magFilt << SS2_MAG_FILTER_SHIFT));
 208
 209
 210    /* 3D textures don't seem to respect the border color.
 211     * Fallback if there's ever a danger that they might refer to
 212     * it.
 213     *
 214     * Effectively this means fallback on 3D clamp or
 215     * clamp_to_border.
 216     *
 217     * XXX: Check if this is true on i945.
 218     * XXX: Check if this bug got fixed in release silicon.
 219     */
 220    if (mt->target == PIPE_TEXTURE_3D &&
 221        (sampler->min_img_filter != PIPE_TEX_FILTER_NEAREST ||
 222         sampler->mag_img_filter != PIPE_TEX_FILTER_NEAREST) &&
 223        (ws == PIPE_TEX_WRAP_CLAMP ||
 224         wt == PIPE_TEX_WRAP_CLAMP ||
 225         wr == PIPE_TEX_WRAP_CLAMP ||
 226         ws == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 227         wt == PIPE_TEX_WRAP_CLAMP_TO_BORDER ||
 228         wr == PIPE_TEX_WRAP_CLAMP_TO_BORDER)) {
 229 #if 0
 230       if (i915->strict_conformance) {
 231          assert(0);
 232          /*         sampler->fallback = true; */
 233          /* TODO */
 234       }
 235 #endif
 236    }
 237
 238    state[1] =
 239       ((translate_wrap_mode(ws) << SS3_TCX_ADDR_MODE_SHIFT) |
 240        (translate_wrap_mode(wt) << SS3_TCY_ADDR_MODE_SHIFT) |
 241        (translate_wrap_mode(wr) << SS3_TCZ_ADDR_MODE_SHIFT) |
 242        (unit << SS3_TEXTUREMAP_INDEX_SHIFT));
 243
 244    if (is_power_of_two_texture(mt)) {
 245       state[1] |= SS3_NORMALIZED_COORDS;
 246    }
 247
 248    {
 249       ubyte r = float_to_ubyte(sampler->border_color[0]);
 250       ubyte g = float_to_ubyte(sampler->border_color[1]);
 251       ubyte b = float_to_ubyte(sampler->border_color[2]);
 252       ubyte a = float_to_ubyte(sampler->border_color[3]);
 253       state[2] = I915PACKCOLOR8888(r, g, b, a);
 254    }
 255 }
 256
 257
 258
 259 void i915_update_samplers( struct i915_context *i915 )
 260 {
 261    const struct pipe_surface *surface = i915->framebuffer.cbufs[0];
 262    uint unit;
 263
 264    i915->current.sampler_enable_nr = 0;
 265    i915->current.sampler_enable_flags = 0x0;
 266
 267    for (unit = 0; unit < I915_TEX_UNITS; unit++) {
 268       /* determine unit enable/disable by looking for a bound mipmap tree */
 269       /* could also examine the fragment program? */
 270       if (i915->texture[unit]) {
 271          update_sampler( i915,
 272                          unit,
 273                          i915->sampler + unit,       /* sampler state */
 274                          i915->texture[unit],        /* mipmap tree */
 275                          surface,                    /* cbuffer info */
 276                          i915->current.sampler[unit] /* the result */
 277                          );
 278
 279          i915->current.sampler_enable_nr++;
 280          i915->current.sampler_enable_flags |= (1 << unit);
 281       }
 282    }
 283
 284    i915->hardware_dirty |= I915_HW_SAMPLER;
 285 }