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_atom.h"
  40 #include "st_program.h"
  41 #include "pipe/p_context.h"
  42 #include "pipe/p_defines.h"
  43
  44 #include "cso_cache/cso_context.h"
  45
  46
  47 /**
  48  * Convert GLenum texcoord wrap tokens to pipe tokens.
  49  */
  50 static GLuint
  51 gl_wrap_to_sp(GLenum wrap)
  52 {
  53    switch (wrap) {
  54    case GL_REPEAT:
  55       return PIPE_TEX_WRAP_REPEAT;
  56    case GL_CLAMP:
  57       return PIPE_TEX_WRAP_CLAMP;
  58    case GL_CLAMP_TO_EDGE:
  59       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  60    case GL_CLAMP_TO_BORDER:
  61       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  62    case GL_MIRRORED_REPEAT:
  63       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  64    case GL_MIRROR_CLAMP_EXT:
  65       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  66    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  67       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  68    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  69       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  70    default:
  71       assert(0);
  72       return 0;
  73    }
  74 }
  75
  76
  77 static GLuint
  78 gl_filter_to_mip_filter(GLenum filter)
  79 {
  80    switch (filter) {
  81    case GL_NEAREST:
  82    case GL_LINEAR:
  83       return PIPE_TEX_MIPFILTER_NONE;
  84
  85    case GL_NEAREST_MIPMAP_NEAREST:
  86    case GL_LINEAR_MIPMAP_NEAREST:
  87       return PIPE_TEX_MIPFILTER_NEAREST;
  88
  89    case GL_NEAREST_MIPMAP_LINEAR:
  90    case GL_LINEAR_MIPMAP_LINEAR:
  91       return PIPE_TEX_MIPFILTER_LINEAR;
  92
  93    default:
  94       assert(0);
  95       return PIPE_TEX_MIPFILTER_NONE;
  96    }
  97 }
  98
  99
 100 static GLuint
 101 gl_filter_to_img_filter(GLenum filter)
 102 {
 103    switch (filter) {
 104    case GL_NEAREST:
 105    case GL_NEAREST_MIPMAP_NEAREST:
 106    case GL_NEAREST_MIPMAP_LINEAR:
 107       return PIPE_TEX_FILTER_NEAREST;
 108
 109    case GL_LINEAR:
 110    case GL_LINEAR_MIPMAP_NEAREST:
 111    case GL_LINEAR_MIPMAP_LINEAR:
 112       return PIPE_TEX_FILTER_LINEAR;
 113
 114    default:
 115       assert(0);
 116       return PIPE_TEX_FILTER_NEAREST;
 117    }
 118 }
 119
 120
 121 static void
 122 update_samplers(struct st_context *st)
 123 {
 124    struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
 125    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 126    const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
 127                                     fprog->Base.SamplersUsed);
 128    GLuint su;
 129
 130    st->state.num_samplers = 0;
 131
 132    /* loop over sampler units (aka tex image units) */
 133    for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
 134       struct pipe_sampler_state *sampler = st->state.samplers + su;
 135
 136       memset(sampler, 0, sizeof(*sampler));
 137
 138       if (samplersUsed & (1 << su)) {
 139          struct gl_texture_object *texobj;
 140          GLuint texUnit;
 141
 142          if (fprog->Base.SamplersUsed & (1 << su))
 143             texUnit = fprog->Base.SamplerUnits[su];
 144          else
 145             texUnit = vprog->Base.SamplerUnits[su];
 146
 147          texobj = st->ctx->Texture.Unit[texUnit]._Current;
 148          if (!texobj) {
 149             texobj = st_get_default_texture(st);
 150          }
 151
 152          sampler->wrap_s = gl_wrap_to_sp(texobj->WrapS);
 153          sampler->wrap_t = gl_wrap_to_sp(texobj->WrapT);
 154          sampler->wrap_r = gl_wrap_to_sp(texobj->WrapR);
 155
 156          sampler->min_img_filter = gl_filter_to_img_filter(texobj->MinFilter);
 157          sampler->min_mip_filter = gl_filter_to_mip_filter(texobj->MinFilter);
 158          sampler->mag_img_filter = gl_filter_to_img_filter(texobj->MagFilter);
 159
 160          if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 161             sampler->normalized_coords = 1;
 162
 163          sampler->lod_bias = st->ctx->Texture.Unit[su].LodBias;
 164          sampler->min_lod = MAX2(0.0f, texobj->MinLod);
 165          sampler->max_lod = MIN2(texobj->MaxLevel - texobj->BaseLevel,
 166                                  texobj->MaxLod);
 167          if (sampler->max_lod < sampler->min_lod) {
 168             /* The GL spec doesn't seem to specify what to do in this case.
 169              * Swap the values.
 170              */
 171             float tmp = sampler->max_lod;
 172             sampler->max_lod = sampler->min_lod;
 173             sampler->min_lod = tmp;
 174             assert(sampler->min_lod <= sampler->max_lod);
 175          }
 176
 177          sampler->border_color[0] = texobj->BorderColor[RCOMP];
 178          sampler->border_color[1] = texobj->BorderColor[GCOMP];
 179          sampler->border_color[2] = texobj->BorderColor[BCOMP];
 180          sampler->border_color[3] = texobj->BorderColor[ACOMP];
 181
 182          sampler->max_anisotropy = texobj->MaxAnisotropy;
 183          if (sampler->max_anisotropy > 1.0) {
 184             sampler->min_img_filter = PIPE_TEX_FILTER_ANISO;
 185             sampler->mag_img_filter = PIPE_TEX_FILTER_ANISO;
 186          }
 187
 188          /* only care about ARB_shadow, not SGI shadow */
 189          if (texobj->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 190             sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 191             sampler->compare_func
 192                = st_compare_func_to_pipe(texobj->CompareFunc);
 193          }
 194
 195          st->state.num_samplers = su + 1;
 196
 197          /*printf("%s su=%u non-null\n", __FUNCTION__, su);*/
 198          cso_single_sampler(st->cso_context, su, sampler);
 199       }
 200       else {
 201          /*printf("%s su=%u null\n", __FUNCTION__, su);*/
 202          cso_single_sampler(st->cso_context, su, NULL);
 203       }
 204    }
 205
 206    cso_single_sampler_done(st->cso_context);
 207 }
 208
 209
 210 const struct st_tracked_state st_update_sampler = {
 211    "st_update_sampler",                                 /* name */
 212    {                                                    /* dirty */
 213       _NEW_TEXTURE,                                     /* mesa */
 214       0,                                                /* st */
 215    },
 216    update_samplers                                      /* update */
 217 };