src/mesa/drivers/dri/i965/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 "macros.h"
  38
  39
  40
  41 /* Samplers aren't strictly wm state from the hardware's perspective,
  42  * but that is the only situation in which we use them in this driver.
  43  */
  44
  45
  46
  47 /* The brw (and related graphics cores) do not support GL_CLAMP.  The
  48  * Intel drivers for "other operating systems" implement GL_CLAMP as
  49  * GL_CLAMP_TO_EDGE, so the same is done here.
  50  */
  51 static GLuint translate_wrap_mode( GLenum wrap )
  52 {
  53    switch( wrap ) {
  54    case GL_REPEAT:
  55       return BRW_TEXCOORDMODE_WRAP;
  56    case GL_CLAMP:
  57       return BRW_TEXCOORDMODE_CLAMP_BORDER; /* conform likes it this way */
  58    case GL_CLAMP_TO_EDGE:
  59       return BRW_TEXCOORDMODE_CLAMP; /* conform likes it this way */
  60    case GL_CLAMP_TO_BORDER:
  61       return BRW_TEXCOORDMODE_CLAMP_BORDER;
  62    case GL_MIRRORED_REPEAT:
  63       return BRW_TEXCOORDMODE_MIRROR;
  64    default:
  65       return BRW_TEXCOORDMODE_WRAP;
  66    }
  67 }
  68
  69
  70 static GLuint U_FIXED(GLfloat value, GLuint frac_bits)
  71 {
  72    value *= (1<<frac_bits);
  73    return value < 0 ? 0 : value;
  74 }
  75
  76 static GLint S_FIXED(GLfloat value, GLuint frac_bits)
  77 {
  78    return value * (1<<frac_bits);
  79 }
  80
  81
  82 static GLuint upload_default_color( struct brw_context *brw,
  83                                     const GLfloat *color )
  84 {
  85    struct brw_sampler_default_color sdc;
  86
  87    COPY_4V(sdc.color, color);
  88
  89    return brw_cache_data( &brw->cache[BRW_SAMPLER_DEFAULT_COLOR], &sdc );
  90 }
  91
  92
  93 /*
  94  */
  95 static void brw_update_sampler_state( struct gl_texture_unit *texUnit,
  96                                       struct gl_texture_object *texObj,
  97                                       GLuint sdc_gs_offset,
  98                                       struct brw_sampler_state *sampler)
  99 {
 100    _mesa_memset(sampler, 0, sizeof(*sampler));
 101
 102    switch (texObj->MinFilter) {
 103    case GL_NEAREST:
 104       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 105       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
 106       break;
 107    case GL_LINEAR:
 108       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 109       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
 110       break;
 111    case GL_NEAREST_MIPMAP_NEAREST:
 112       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 113       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
 114       break;
 115    case GL_LINEAR_MIPMAP_NEAREST:
 116       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 117       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
 118       break;
 119    case GL_NEAREST_MIPMAP_LINEAR:
 120       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 121       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
 122       break;
 123    case GL_LINEAR_MIPMAP_LINEAR:
 124       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 125       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
 126       break;
 127    default:
 128       break;
 129    }
 130
 131    /* Set Anisotropy:
 132     */
 133    if ( texObj->MaxAnisotropy > 1.0 ) {
 134       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
 135       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
 136
 137       if (texObj->MaxAnisotropy > 2.0) {
 138          sampler->ss3.max_aniso = MAX2((texObj->MaxAnisotropy - 2) / 2,
 139                                        BRW_ANISORATIO_16);
 140       }
 141    }
 142    else {
 143       switch (texObj->MagFilter) {
 144       case GL_NEAREST:
 145          sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
 146          break;
 147       case GL_LINEAR:
 148          sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
 149          break;
 150       default:
 151          break;
 152       }
 153    }
 154
 155    sampler->ss1.r_wrap_mode = translate_wrap_mode(texObj->WrapR);
 156    sampler->ss1.s_wrap_mode = translate_wrap_mode(texObj->WrapS);
 157    sampler->ss1.t_wrap_mode = translate_wrap_mode(texObj->WrapT);
 158
 159    /* Fulsim complains if I don't do this.  Hardware doesn't mind:
 160     */
 161 #if 0
 162    if (texObj->Target == GL_TEXTURE_CUBE_MAP_ARB) {
 163       sampler->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 164       sampler->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 165       sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 166    }
 167 #endif
 168
 169    /* Set shadow function:
 170     */
 171    if (texObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
 172       /* Shadowing is "enabled" by emitting a particular sampler
 173        * message (sample_c).  So need to recompile WM program when
 174        * shadow comparison is enabled on each/any texture unit.
 175        */
 176       sampler->ss0.shadow_function = intel_translate_compare_func(texObj->CompareFunc);
 177    }
 178
 179    /* Set LOD bias:
 180     */
 181    sampler->ss0.lod_bias = S_FIXED(texUnit->LodBias + texObj->LodBias, 6);
 182
 183    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 184    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 185
 186    /* Set BaseMipLevel, MaxLOD, MinLOD:
 187     *
 188     * XXX: I don't think that using firstLevel, lastLevel works,
 189     * because we always setup the surface state as if firstLevel ==
 190     * level zero.  Probably have to subtract firstLevel from each of
 191     * these:
 192     */
 193    sampler->ss0.base_level = U_FIXED(0, 1);
 194
 195    sampler->ss1.max_lod = U_FIXED(MAX2(texObj->MaxLod, 0), 6);
 196    sampler->ss1.min_lod = U_FIXED(MAX2(texObj->MinLod, 0), 6);
 197
 198    sampler->ss2.default_color_pointer = sdc_gs_offset >> 5;
 199 }
 200
 201
 202
 203 /* All samplers must be uploaded in a single contiguous array, which
 204  * complicates various things.  However, this is still too confusing -
 205  * FIXME: simplify all the different new texture state flags.
 206  */
 207 static void upload_wm_samplers( struct brw_context *brw )
 208 {
 209    GLuint unit;
 210    GLuint sampler_count = 0;
 211
 212    /* _NEW_TEXTURE */
 213    for (unit = 0; unit < BRW_MAX_TEX_UNIT; unit++) {
 214       if (brw->attribs.Texture->Unit[unit]._ReallyEnabled) {
 215          struct gl_texture_unit *texUnit = &brw->attribs.Texture->Unit[unit];
 216          struct gl_texture_object *texObj = texUnit->_Current;
 217
 218          GLuint sdc_gs_offset = upload_default_color(brw, texObj->BorderColor);
 219
 220          brw_update_sampler_state(texUnit,
 221                                   texObj,
 222                                   sdc_gs_offset,
 223                                   &brw->wm.sampler[unit]);
 224
 225          sampler_count = unit + 1;
 226       }
 227    }
 228
 229    if (brw->wm.sampler_count != sampler_count) {
 230       brw->wm.sampler_count = sampler_count;
 231       brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 232    }
 233
 234    brw->wm.sampler_gs_offset = 0;
 235
 236    if (brw->wm.sampler_count)
 237       brw->wm.sampler_gs_offset =
 238          brw_cache_data_sz(&brw->cache[BRW_SAMPLER],
 239                            brw->wm.sampler,
 240                            sizeof(struct brw_sampler_state) * brw->wm.sampler_count);
 241 }
 242
 243
 244 const struct brw_tracked_state brw_wm_samplers = {
 245    .dirty = {
 246       .mesa = _NEW_TEXTURE,
 247       .brw = 0,
 248       .cache = 0
 249    },
 250    .update = upload_wm_samplers
 251 };
 252
 253