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