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