src/mesa/state_tracker/st_atom_sampler.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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  /*
  29   * Authors:
  30   *   Keith Whitwell <keithw@vmware.com>
  31   *   Brian Paul
  32   */
  33
  34
  35 #include "main/macros.h"
  36 #include "main/mtypes.h"
  37 #include "main/glformats.h"
  38 #include "main/samplerobj.h"
  39 #include "main/teximage.h"
  40 #include "main/texobj.h"
  41
  42 #include "st_context.h"
  43 #include "st_cb_texture.h"
  44 #include "st_format.h"
  45 #include "st_atom.h"
  46 #include "st_texture.h"
  47 #include "pipe/p_context.h"
  48 #include "pipe/p_defines.h"
  49
  50 #include "cso_cache/cso_context.h"
  51
  52 #include "util/u_format.h"
  53
  54
  55 /**
  56  * Convert GLenum texcoord wrap tokens to pipe tokens.
  57  */
  58 static GLuint
  59 gl_wrap_xlate(GLenum wrap)
  60 {
  61    switch (wrap) {
  62    case GL_REPEAT:
  63       return PIPE_TEX_WRAP_REPEAT;
  64    case GL_CLAMP:
  65       return PIPE_TEX_WRAP_CLAMP;
  66    case GL_CLAMP_TO_EDGE:
  67       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  68    case GL_CLAMP_TO_BORDER:
  69       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  70    case GL_MIRRORED_REPEAT:
  71       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  72    case GL_MIRROR_CLAMP_EXT:
  73       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  74    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  75       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  76    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  77       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  78    default:
  79       assert(0);
  80       return 0;
  81    }
  82 }
  83
  84
  85 static GLuint
  86 gl_filter_to_mip_filter(GLenum filter)
  87 {
  88    switch (filter) {
  89    case GL_NEAREST:
  90    case GL_LINEAR:
  91       return PIPE_TEX_MIPFILTER_NONE;
  92
  93    case GL_NEAREST_MIPMAP_NEAREST:
  94    case GL_LINEAR_MIPMAP_NEAREST:
  95       return PIPE_TEX_MIPFILTER_NEAREST;
  96
  97    case GL_NEAREST_MIPMAP_LINEAR:
  98    case GL_LINEAR_MIPMAP_LINEAR:
  99       return PIPE_TEX_MIPFILTER_LINEAR;
 100
 101    default:
 102       assert(0);
 103       return PIPE_TEX_MIPFILTER_NONE;
 104    }
 105 }
 106
 107
 108 static GLuint
 109 gl_filter_to_img_filter(GLenum filter)
 110 {
 111    switch (filter) {
 112    case GL_NEAREST:
 113    case GL_NEAREST_MIPMAP_NEAREST:
 114    case GL_NEAREST_MIPMAP_LINEAR:
 115       return PIPE_TEX_FILTER_NEAREST;
 116
 117    case GL_LINEAR:
 118    case GL_LINEAR_MIPMAP_NEAREST:
 119    case GL_LINEAR_MIPMAP_LINEAR:
 120       return PIPE_TEX_FILTER_LINEAR;
 121
 122    default:
 123       assert(0);
 124       return PIPE_TEX_FILTER_NEAREST;
 125    }
 126 }
 127
 128
 129 static void
 130 convert_sampler(struct st_context *st,
 131                 struct pipe_sampler_state *sampler,
 132                 GLuint texUnit)
 133 {
 134    const struct gl_texture_object *texobj;
 135    struct gl_context *ctx = st->ctx;
 136    struct gl_sampler_object *msamp;
 137    GLenum texBaseFormat;
 138
 139    texobj = ctx->Texture.Unit[texUnit]._Current;
 140    if (!texobj) {
 141       texobj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
 142    }
 143
 144    texBaseFormat = _mesa_texture_base_format(texobj);
 145
 146    msamp = _mesa_get_samplerobj(ctx, texUnit);
 147
 148    memset(sampler, 0, sizeof(*sampler));
 149    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 150    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 151    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 152
 153    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 154    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 155    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 156
 157    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 158       sampler->normalized_coords = 1;
 159
 160    sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
 161
 162    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
 163    sampler->max_lod = msamp->MaxLod;
 164    if (sampler->max_lod < sampler->min_lod) {
 165       /* The GL spec doesn't seem to specify what to do in this case.
 166        * Swap the values.
 167        */
 168       float tmp = sampler->max_lod;
 169       sampler->max_lod = sampler->min_lod;
 170       sampler->min_lod = tmp;
 171       assert(sampler->min_lod <= sampler->max_lod);
 172    }
 173
 174    /* For non-black borders... */
 175    if (msamp->BorderColor.ui[0] ||
 176        msamp->BorderColor.ui[1] ||
 177        msamp->BorderColor.ui[2] ||
 178        msamp->BorderColor.ui[3]) {
 179       const struct st_texture_object *stobj = st_texture_object_const(texobj);
 180       const GLboolean is_integer = texobj->_IsIntegerFormat;
 181       const struct pipe_sampler_view *sv = NULL;
 182       union pipe_color_union border_color;
 183       GLuint i;
 184
 185       /* Just search for the first used view. We can do this because the
 186          swizzle is per-texture, not per context. */
 187       /* XXX: clean that up to not use the sampler view at all */
 188       for (i = 0; i < stobj->num_sampler_views; ++i) {
 189          if (stobj->sampler_views[i]) {
 190             sv = stobj->sampler_views[i];
 191             break;
 192          }
 193       }
 194
 195       if (st->apply_texture_swizzle_to_border_color && sv) {
 196          const unsigned char swz[4] =
 197          {
 198             sv->swizzle_r,
 199             sv->swizzle_g,
 200             sv->swizzle_b,
 201             sv->swizzle_a,
 202          };
 203
 204          st_translate_color(&msamp->BorderColor,
 205                             &border_color,
 206                             texBaseFormat, is_integer);
 207
 208          util_format_apply_color_swizzle(&sampler->border_color,
 209                                          &border_color, swz, is_integer);
 210       } else {
 211          st_translate_color(&msamp->BorderColor,
 212                             &sampler->border_color,
 213                             texBaseFormat, is_integer);
 214       }
 215    }
 216
 217    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 218                               0 : (GLuint) msamp->MaxAnisotropy);
 219
 220    /* If sampling a depth texture and using shadow comparison */
 221    if ((texBaseFormat == GL_DEPTH_COMPONENT ||
 222         texBaseFormat == GL_DEPTH_STENCIL) &&
 223        msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 224       sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 225       sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 226    }
 227
 228    sampler->seamless_cube_map =
 229       ctx->Texture.CubeMapSeamless || msamp->CubeMapSeamless;
 230 }
 231
 232
 233 /**
 234  * Update the gallium driver's sampler state for fragment, vertex or
 235  * geometry shader stage.
 236  */
 237 static void
 238 update_shader_samplers(struct st_context *st,
 239                        unsigned shader_stage,
 240                        const struct gl_program *prog,
 241                        unsigned max_units,
 242                        struct pipe_sampler_state *samplers,
 243                        unsigned *num_samplers)
 244 {
 245    GLuint unit;
 246    GLbitfield samplers_used;
 247    const GLuint old_max = *num_samplers;
 248    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 249
 250    samplers_used = prog->SamplersUsed;
 251
 252    if (*num_samplers == 0 && samplers_used == 0x0)
 253       return;
 254
 255    *num_samplers = 0;
 256
 257    /* loop over sampler units (aka tex image units) */
 258    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 259       struct pipe_sampler_state *sampler = samplers + unit;
 260
 261       if (samplers_used & 1) {
 262          const GLuint texUnit = prog->SamplerUnits[unit];
 263
 264          convert_sampler(st, sampler, texUnit);
 265          states[unit] = sampler;
 266          *num_samplers = unit + 1;
 267       }
 268       else if (samplers_used != 0 || unit < old_max) {
 269          states[unit] = NULL;
 270       }
 271       else {
 272          /* if we've reset all the old samplers and we have no more new ones */
 273          break;
 274       }
 275    }
 276
 277    cso_set_samplers(st->cso_context, shader_stage, *num_samplers, states);
 278 }
 279
 280
 281 static void
 282 update_samplers(struct st_context *st)
 283 {
 284    const struct gl_context *ctx = st->ctx;
 285
 286    update_shader_samplers(st,
 287                           PIPE_SHADER_FRAGMENT,
 288                           &ctx->FragmentProgram._Current->Base,
 289                           ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 290                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 291                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 292
 293    update_shader_samplers(st,
 294                           PIPE_SHADER_VERTEX,
 295                           &ctx->VertexProgram._Current->Base,
 296                           ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits,
 297                           st->state.samplers[PIPE_SHADER_VERTEX],
 298                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 299
 300    if (ctx->GeometryProgram._Current) {
 301       update_shader_samplers(st,
 302                              PIPE_SHADER_GEOMETRY,
 303                              &ctx->GeometryProgram._Current->Base,
 304                              ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits,
 305                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 306                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 307    }
 308    if (ctx->TessCtrlProgram._Current) {
 309       update_shader_samplers(st,
 310                              PIPE_SHADER_TESS_CTRL,
 311                              &ctx->TessCtrlProgram._Current->Base,
 312                              ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits,
 313                              st->state.samplers[PIPE_SHADER_TESS_CTRL],
 314                              &st->state.num_samplers[PIPE_SHADER_TESS_CTRL]);
 315    }
 316    if (ctx->TessEvalProgram._Current) {
 317       update_shader_samplers(st,
 318                              PIPE_SHADER_TESS_EVAL,
 319                              &ctx->TessEvalProgram._Current->Base,
 320                              ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits,
 321                              st->state.samplers[PIPE_SHADER_TESS_EVAL],
 322                              &st->state.num_samplers[PIPE_SHADER_TESS_EVAL]);
 323    }
 324 }
 325
 326
 327 const struct st_tracked_state st_update_sampler = {
 328    "st_update_sampler",                                 /* name */
 329    {                                                    /* dirty */
 330       _NEW_TEXTURE,                                     /* mesa */
 331       0,                                                /* st */
 332    },
 333    update_samplers                                      /* update */
 334 };