src/mesa/state_tracker/st_atom_sampler.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34
  35 #include "main/macros.h"
  36 #include "main/mtypes.h"
  37 #include "main/samplerobj.h"
  38
  39 #include "st_context.h"
  40 #include "st_cb_texture.h"
  41 #include "st_format.h"
  42 #include "st_atom.h"
  43 #include "st_texture.h"
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_defines.h"
  46
  47 #include "cso_cache/cso_context.h"
  48
  49
  50 /**
  51  * Convert GLenum texcoord wrap tokens to pipe tokens.
  52  */
  53 static GLuint
  54 gl_wrap_xlate(GLenum wrap)
  55 {
  56    switch (wrap) {
  57    case GL_REPEAT:
  58       return PIPE_TEX_WRAP_REPEAT;
  59    case GL_CLAMP:
  60       return PIPE_TEX_WRAP_CLAMP;
  61    case GL_CLAMP_TO_EDGE:
  62       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  63    case GL_CLAMP_TO_BORDER:
  64       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  65    case GL_MIRRORED_REPEAT:
  66       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  67    case GL_MIRROR_CLAMP_EXT:
  68       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  69    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  70       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  71    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  72       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  73    default:
  74       assert(0);
  75       return 0;
  76    }
  77 }
  78
  79
  80 static GLuint
  81 gl_filter_to_mip_filter(GLenum filter)
  82 {
  83    switch (filter) {
  84    case GL_NEAREST:
  85    case GL_LINEAR:
  86       return PIPE_TEX_MIPFILTER_NONE;
  87
  88    case GL_NEAREST_MIPMAP_NEAREST:
  89    case GL_LINEAR_MIPMAP_NEAREST:
  90       return PIPE_TEX_MIPFILTER_NEAREST;
  91
  92    case GL_NEAREST_MIPMAP_LINEAR:
  93    case GL_LINEAR_MIPMAP_LINEAR:
  94       return PIPE_TEX_MIPFILTER_LINEAR;
  95
  96    default:
  97       assert(0);
  98       return PIPE_TEX_MIPFILTER_NONE;
  99    }
 100 }
 101
 102
 103 static GLuint
 104 gl_filter_to_img_filter(GLenum filter)
 105 {
 106    switch (filter) {
 107    case GL_NEAREST:
 108    case GL_NEAREST_MIPMAP_NEAREST:
 109    case GL_NEAREST_MIPMAP_LINEAR:
 110       return PIPE_TEX_FILTER_NEAREST;
 111
 112    case GL_LINEAR:
 113    case GL_LINEAR_MIPMAP_NEAREST:
 114    case GL_LINEAR_MIPMAP_LINEAR:
 115       return PIPE_TEX_FILTER_LINEAR;
 116
 117    default:
 118       assert(0);
 119       return PIPE_TEX_FILTER_NEAREST;
 120    }
 121 }
 122
 123
 124 static void
 125 update_samplers(struct st_context *st)
 126 {
 127    struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
 128    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 129    const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
 130                                     fprog->Base.SamplersUsed);
 131    GLuint su;
 132
 133    st->state.num_samplers = 0;
 134
 135    /* loop over sampler units (aka tex image units) */
 136    for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
 137       struct pipe_sampler_state *sampler = st->state.samplers + su;
 138
 139       memset(sampler, 0, sizeof(*sampler));
 140
 141       if (samplersUsed & (1 << su)) {
 142          struct gl_texture_object *texobj;
 143          struct gl_texture_image *teximg;
 144          struct gl_sampler_object *msamp;
 145          GLuint texUnit;
 146
 147          if (fprog->Base.SamplersUsed & (1 << su))
 148             texUnit = fprog->Base.SamplerUnits[su];
 149          else
 150             texUnit = vprog->Base.SamplerUnits[su];
 151
 152          texobj = st->ctx->Texture.Unit[texUnit]._Current;
 153          if (!texobj) {
 154             texobj = st_get_default_texture(st);
 155          }
 156
 157          teximg = texobj->Image[0][texobj->BaseLevel];
 158
 159          msamp = _mesa_get_samplerobj(st->ctx, texUnit);
 160
 161          sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 162          sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 163          sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 164
 165          sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 166          sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 167          sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 168
 169          if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 170             sampler->normalized_coords = 1;
 171
 172          sampler->lod_bias = st->ctx->Texture.Unit[texUnit].LodBias +
 173             msamp->LodBias;
 174
 175          sampler->min_lod = CLAMP(msamp->MinLod,
 176                                   0.0f,
 177                                   (GLfloat) texobj->MaxLevel - texobj->BaseLevel);
 178          sampler->max_lod = MIN2((GLfloat) texobj->MaxLevel - texobj->BaseLevel,
 179                                  msamp->MaxLod);
 180          if (sampler->max_lod < sampler->min_lod) {
 181             /* The GL spec doesn't seem to specify what to do in this case.
 182              * Swap the values.
 183              */
 184             float tmp = sampler->max_lod;
 185             sampler->max_lod = sampler->min_lod;
 186             sampler->min_lod = tmp;
 187             assert(sampler->min_lod <= sampler->max_lod);
 188          }
 189
 190          st_translate_color(msamp->BorderColor.f,
 191                             teximg ? teximg->_BaseFormat : GL_RGBA,
 192                             sampler->border_color);
 193
 194          sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 195                                     0 : (GLuint) msamp->MaxAnisotropy);
 196
 197          /* only care about ARB_shadow, not SGI shadow */
 198          if (msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 199             sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 200             sampler->compare_func
 201                = st_compare_func_to_pipe(msamp->CompareFunc);
 202          }
 203
 204          st->state.num_samplers = su + 1;
 205
 206          /*printf("%s su=%u non-null\n", __FUNCTION__, su);*/
 207          cso_single_sampler(st->cso_context, su, sampler);
 208          if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
 209             cso_single_vertex_sampler(st->cso_context, su, sampler);
 210          }
 211       }
 212       else {
 213          /*printf("%s su=%u null\n", __FUNCTION__, su);*/
 214          cso_single_sampler(st->cso_context, su, NULL);
 215          if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
 216             cso_single_vertex_sampler(st->cso_context, su, NULL);
 217          }
 218       }
 219    }
 220
 221    cso_single_sampler_done(st->cso_context);
 222    if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {
 223       cso_single_vertex_sampler_done(st->cso_context);
 224    }
 225 }
 226
 227
 228 const struct st_tracked_state st_update_sampler = {
 229    "st_update_sampler",                                 /* name */
 230    {                                                    /* dirty */
 231       _NEW_TEXTURE,                                     /* mesa */
 232       0,                                                /* st */
 233    },
 234    update_samplers                                      /* update */
 235 };