src/gallium/drivers/i965simple/brw_wm_sampler_state.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "brw_context.h"
  34 #include "brw_state.h"
  35 #include "brw_defines.h"
  36
  37 #include "util/u_math.h"
  38 #include "util/u_memory.h"
  39
  40
  41 #define COMPAREFUNC_ALWAYS              0
  42 #define COMPAREFUNC_NEVER               0x1
  43 #define COMPAREFUNC_LESS                0x2
  44 #define COMPAREFUNC_EQUAL               0x3
  45 #define COMPAREFUNC_LEQUAL              0x4
  46 #define COMPAREFUNC_GREATER             0x5
  47 #define COMPAREFUNC_NOTEQUAL            0x6
  48 #define COMPAREFUNC_GEQUAL              0x7
  49
  50 /* Samplers aren't strictly wm state from the hardware's perspective,
  51  * but that is the only situation in which we use them in this driver.
  52  */
  53
  54 static int intel_translate_shadow_compare_func(unsigned func)
  55 {
  56    switch(func) {
  57    case PIPE_FUNC_NEVER:
  58        return COMPAREFUNC_ALWAYS;
  59    case PIPE_FUNC_LESS:
  60        return COMPAREFUNC_LEQUAL;
  61    case PIPE_FUNC_LEQUAL:
  62        return COMPAREFUNC_LESS;
  63    case PIPE_FUNC_GREATER:
  64        return COMPAREFUNC_GEQUAL;
  65    case PIPE_FUNC_GEQUAL:
  66       return COMPAREFUNC_GREATER;
  67    case PIPE_FUNC_NOTEQUAL:
  68       return COMPAREFUNC_EQUAL;
  69    case PIPE_FUNC_EQUAL:
  70       return COMPAREFUNC_NOTEQUAL;
  71    case PIPE_FUNC_ALWAYS:
  72        return COMPAREFUNC_NEVER;
  73    }
  74
  75    debug_printf("Unknown value in %s: %x\n", __FUNCTION__, func);
  76    return COMPAREFUNC_NEVER;
  77 }
  78
  79 /* The brw (and related graphics cores) do not support GL_CLAMP.  The
  80  * Intel drivers for "other operating systems" implement GL_CLAMP as
  81  * GL_CLAMP_TO_EDGE, so the same is done here.
  82  */
  83 static unsigned translate_wrap_mode( int wrap )
  84 {
  85    switch( wrap ) {
  86    case PIPE_TEX_WRAP_REPEAT:
  87       return BRW_TEXCOORDMODE_WRAP;
  88    case PIPE_TEX_WRAP_CLAMP:
  89       return BRW_TEXCOORDMODE_CLAMP;
  90    case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
  91       return BRW_TEXCOORDMODE_CLAMP; /* conform likes it this way */
  92    case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
  93       return BRW_TEXCOORDMODE_CLAMP_BORDER;
  94    case PIPE_TEX_WRAP_MIRROR_REPEAT:
  95       return BRW_TEXCOORDMODE_MIRROR;
  96    default:
  97       return BRW_TEXCOORDMODE_WRAP;
  98    }
  99 }
 100
 101
 102 static unsigned U_FIXED(float value, unsigned frac_bits)
 103 {
 104    value *= (1<<frac_bits);
 105    return value < 0 ? 0 : value;
 106 }
 107
 108 static int S_FIXED(float value, unsigned frac_bits)
 109 {
 110    return value * (1<<frac_bits);
 111 }
 112
 113
 114 static unsigned upload_default_color( struct brw_context *brw,
 115                                       const float *color )
 116 {
 117    struct brw_sampler_default_color sdc;
 118
 119    COPY_4V(sdc.color, color);
 120
 121    return brw_cache_data( &brw->cache[BRW_SAMPLER_DEFAULT_COLOR], &sdc );
 122 }
 123
 124
 125 /*
 126  */
 127 static void brw_update_sampler_state( const struct pipe_sampler_state *pipe_sampler,
 128                                       unsigned sdc_gs_offset,
 129                                       struct brw_sampler_state *sampler)
 130 {
 131    memset(sampler, 0, sizeof(*sampler));
 132
 133    switch (pipe_sampler->min_mip_filter) {
 134    case PIPE_TEX_FILTER_NEAREST:
 135       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 136       break;
 137    case PIPE_TEX_FILTER_LINEAR:
 138       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 139       break;
 140    case PIPE_TEX_FILTER_ANISO:
 141       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
 142       break;
 143    default:
 144       break;
 145    }
 146
 147    switch (pipe_sampler->min_mip_filter) {
 148    case PIPE_TEX_MIPFILTER_NEAREST:
 149       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
 150       break;
 151    case PIPE_TEX_MIPFILTER_LINEAR:
 152       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
 153       break;
 154    case PIPE_TEX_MIPFILTER_NONE:
 155       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
 156       break;
 157    default:
 158       break;
 159    }
 160    /* Set Anisotropy:
 161     */
 162    switch (pipe_sampler->mag_img_filter) {
 163    case PIPE_TEX_FILTER_NEAREST:
 164       sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
 165       break;
 166    case PIPE_TEX_FILTER_LINEAR:
 167       sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
 168       break;
 169    case PIPE_TEX_FILTER_ANISO:
 170       sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
 171       break;
 172    default:
 173       break;
 174    }
 175
 176    if (pipe_sampler->max_anisotropy > 2.0) {
 177       sampler->ss3.max_aniso = MAX2((pipe_sampler->max_anisotropy - 2) / 2,
 178                                     BRW_ANISORATIO_16);
 179    }
 180
 181    sampler->ss1.s_wrap_mode = translate_wrap_mode(pipe_sampler->wrap_s);
 182    sampler->ss1.r_wrap_mode = translate_wrap_mode(pipe_sampler->wrap_r);
 183    sampler->ss1.t_wrap_mode = translate_wrap_mode(pipe_sampler->wrap_t);
 184
 185    /* Fulsim complains if I don't do this.  Hardware doesn't mind:
 186     */
 187 #if 0
 188    if (texObj->Target == GL_TEXTURE_CUBE_MAP_ARB) {
 189       sampler->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 190       sampler->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 191       sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 192    }
 193 #endif
 194
 195    /* Set shadow function:
 196     */
 197    if (pipe_sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
 198       /* Shadowing is "enabled" by emitting a particular sampler
 199        * message (sample_c).  So need to recompile WM program when
 200        * shadow comparison is enabled on each/any texture unit.
 201        */
 202       sampler->ss0.shadow_function = intel_translate_shadow_compare_func(pipe_sampler->compare_func);
 203    }
 204
 205    /* Set LOD bias:
 206     */
 207    sampler->ss0.lod_bias = S_FIXED(CLAMP(pipe_sampler->lod_bias, -16, 15), 6);
 208
 209    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 210    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 211
 212    /* Set BaseMipLevel, MaxLOD, MinLOD:
 213     *
 214     * XXX: I don't think that using firstLevel, lastLevel works,
 215     * because we always setup the surface state as if firstLevel ==
 216     * level zero.  Probably have to subtract firstLevel from each of
 217     * these:
 218     */
 219    sampler->ss0.base_level = U_FIXED(0, 1);
 220
 221    sampler->ss1.max_lod = U_FIXED(MIN2(MAX2(pipe_sampler->max_lod, 0), 13), 6);
 222    sampler->ss1.min_lod = U_FIXED(MIN2(MAX2(pipe_sampler->min_lod, 0), 13), 6);
 223
 224    sampler->ss2.default_color_pointer = sdc_gs_offset >> 5;
 225 }
 226
 227
 228
 229 /* All samplers must be uploaded in a single contiguous array, which
 230  * complicates various things.  However, this is still too confusing -
 231  * FIXME: simplify all the different new texture state flags.
 232  */
 233 static void upload_wm_samplers(struct brw_context *brw)
 234 {
 235    unsigned unit;
 236    unsigned sampler_count = 0;
 237
 238    /* BRW_NEW_SAMPLER */
 239    for (unit = 0; unit < brw->num_textures && unit < brw->num_samplers;
 240         unit++) {
 241       /* determine unit enable/disable by looking for a bound texture */
 242       if (brw->attribs.Texture[unit]) {
 243          const struct pipe_sampler_state *sampler = brw->attribs.Samplers[unit];
 244          unsigned sdc_gs_offset = upload_default_color(brw, sampler->border_color);
 245
 246          brw_update_sampler_state(sampler,
 247                                   sdc_gs_offset,
 248                                   &brw->wm.sampler[unit]);
 249
 250          sampler_count = unit + 1;
 251       }
 252    }
 253
 254    if (brw->wm.sampler_count != sampler_count) {
 255       brw->wm.sampler_count = sampler_count;
 256       brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 257    }
 258
 259    brw->wm.sampler_gs_offset = 0;
 260
 261    if (brw->wm.sampler_count)
 262       brw->wm.sampler_gs_offset =
 263          brw_cache_data_sz(&brw->cache[BRW_SAMPLER],
 264                            brw->wm.sampler,
 265                            sizeof(struct brw_sampler_state) * brw->wm.sampler_count);
 266 }
 267
 268 const struct brw_tracked_state brw_wm_samplers = {
 269    .dirty = {
 270       .brw = BRW_NEW_SAMPLER,
 271       .cache = 0
 272    },
 273    .update = upload_wm_samplers
 274 };
 275