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_atom.h"
  39 #include "st_program.h"
  40 #include "pipe/p_context.h"
  41 #include "pipe/p_defines.h"
  42
  43 #include "cso_cache/cso_context.h"
  44
  45
  46 /**
  47  * Convert GLenum texcoord wrap tokens to pipe tokens.
  48  */
  49 static GLuint
  50 gl_wrap_to_sp(GLenum wrap)
  51 {
  52    switch (wrap) {
  53    case GL_REPEAT:
  54       return PIPE_TEX_WRAP_REPEAT;
  55    case GL_CLAMP:
  56       return PIPE_TEX_WRAP_CLAMP;
  57    case GL_CLAMP_TO_EDGE:
  58       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  59    case GL_CLAMP_TO_BORDER:
  60       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  61    case GL_MIRRORED_REPEAT:
  62       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  63    case GL_MIRROR_CLAMP_EXT:
  64       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  65    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  66       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  67    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  68       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  69    default:
  70       abort();
  71       return 0;
  72    }
  73 }
  74
  75
  76 static GLuint
  77 gl_filter_to_mip_filter(GLenum filter)
  78 {
  79    switch (filter) {
  80    case GL_NEAREST:
  81    case GL_LINEAR:
  82       return PIPE_TEX_MIPFILTER_NONE;
  83
  84    case GL_NEAREST_MIPMAP_NEAREST:
  85    case GL_LINEAR_MIPMAP_NEAREST:
  86       return PIPE_TEX_MIPFILTER_NEAREST;
  87
  88    case GL_NEAREST_MIPMAP_LINEAR:
  89    case GL_LINEAR_MIPMAP_LINEAR:
  90       return PIPE_TEX_MIPFILTER_LINEAR;
  91
  92    default:
  93       assert(0);
  94       return PIPE_TEX_MIPFILTER_NONE;
  95    }
  96 }
  97
  98
  99 static GLuint
 100 gl_filter_to_img_filter(GLenum filter)
 101 {
 102    switch (filter) {
 103    case GL_NEAREST:
 104    case GL_NEAREST_MIPMAP_NEAREST:
 105    case GL_NEAREST_MIPMAP_LINEAR:
 106       return PIPE_TEX_FILTER_NEAREST;
 107
 108    case GL_LINEAR:
 109    case GL_LINEAR_MIPMAP_NEAREST:
 110    case GL_LINEAR_MIPMAP_LINEAR:
 111       return PIPE_TEX_FILTER_LINEAR;
 112
 113    default:
 114       assert(0);
 115       return PIPE_TEX_FILTER_NEAREST;
 116    }
 117 }
 118
 119
 120 static void
 121 update_samplers(struct st_context *st)
 122 {
 123    const struct st_fragment_program *fs = st->fp;
 124    GLuint su;
 125
 126    st->state.num_samplers = 0;
 127
 128    /* loop over sampler units (aka tex image units) */
 129    for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
 130       struct pipe_sampler_state *sampler = st->state.samplers + su;
 131
 132       memset(sampler, 0, sizeof(*sampler));
 133
 134       if (fs->Base.Base.SamplersUsed & (1 << su)) {
 135          GLuint texUnit = fs->Base.Base.SamplerUnits[su];
 136          const struct gl_texture_object *texobj
 137             = st->ctx->Texture.Unit[texUnit]._Current;
 138
 139          assert(texobj);
 140
 141          sampler->wrap_s = gl_wrap_to_sp(texobj->WrapS);
 142          sampler->wrap_t = gl_wrap_to_sp(texobj->WrapT);
 143          sampler->wrap_r = gl_wrap_to_sp(texobj->WrapR);
 144
 145          sampler->min_img_filter = gl_filter_to_img_filter(texobj->MinFilter);
 146          sampler->min_mip_filter = gl_filter_to_mip_filter(texobj->MinFilter);
 147          sampler->mag_img_filter = gl_filter_to_img_filter(texobj->MagFilter);
 148
 149          if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 150             sampler->normalized_coords = 1;
 151
 152          sampler->lod_bias = st->ctx->Texture.Unit[su].LodBias;
 153          sampler->min_lod = MAX2(0.0f, texobj->MinLod);
 154          sampler->max_lod = MIN2(texobj->MaxLevel - texobj->BaseLevel,
 155                                  texobj->MaxLod);
 156          if (sampler->max_lod < sampler->min_lod) {
 157             /* The GL spec doesn't seem to specify what to do in this case.
 158              * Swap the values.
 159              */
 160             float tmp = sampler->max_lod;
 161             sampler->max_lod = sampler->min_lod;
 162             sampler->min_lod = tmp;
 163             assert(sampler->min_lod <= sampler->max_lod);
 164          }
 165
 166          sampler->border_color[0] = texobj->BorderColor[RCOMP];
 167          sampler->border_color[1] = texobj->BorderColor[GCOMP];
 168          sampler->border_color[2] = texobj->BorderColor[BCOMP];
 169          sampler->border_color[3] = texobj->BorderColor[ACOMP];
 170
 171          sampler->max_anisotropy = texobj->MaxAnisotropy;
 172          if (sampler->max_anisotropy > 1.0) {
 173             sampler->min_img_filter = PIPE_TEX_FILTER_ANISO;
 174             sampler->mag_img_filter = PIPE_TEX_FILTER_ANISO;
 175          }
 176
 177          /* only care about ARB_shadow, not SGI shadow */
 178          if (texobj->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 179             sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 180             sampler->compare_func
 181                = st_compare_func_to_pipe(texobj->CompareFunc);
 182          }
 183
 184          st->state.num_samplers = su + 1;
 185
 186          /* XXX more sampler state here */
 187
 188          cso_single_sampler(st->cso_context, su, sampler);
 189       }
 190       else {
 191          cso_single_sampler(st->cso_context, su, NULL);
 192       }
 193    }
 194
 195    cso_single_sampler_done(st->cso_context);
 196 }
 197
 198
 199 const struct st_tracked_state st_update_sampler = {
 200    "st_update_sampler",                                 /* name */
 201    {                                                    /* dirty */
 202       _NEW_TEXTURE,                                     /* mesa */
 203       0,                                                /* st */
 204    },
 205    update_samplers                                      /* update */
 206 };