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 "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_xlate(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       assert(0);
  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 xlate_border_color(const GLfloat *colorIn, GLenum baseFormat, GLfloat *colorOut)
 122 {
 123    switch (baseFormat) {
 124    case GL_RED:
 125       colorOut[0] = colorIn[0];
 126       colorOut[1] = 0.0F;
 127       colorOut[2] = 0.0F;
 128       colorOut[3] = 1.0F;
 129       break;
 130    case GL_RG:
 131       colorOut[0] = colorIn[0];
 132       colorOut[1] = colorIn[1];
 133       colorOut[2] = 0.0F;
 134       colorOut[3] = 1.0F;
 135       break;
 136    case GL_RGB:
 137       colorOut[0] = colorIn[0];
 138       colorOut[1] = colorIn[1];
 139       colorOut[2] = colorIn[2];
 140       colorOut[3] = 1.0F;
 141       break;
 142    case GL_ALPHA:
 143       colorOut[0] = colorOut[1] = colorOut[2] = 0.0;
 144       colorOut[3] = colorIn[3];
 145       break;
 146    case GL_LUMINANCE:
 147       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
 148       colorOut[3] = 1.0;
 149       break;
 150    case GL_LUMINANCE_ALPHA:
 151       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
 152       colorOut[3] = colorIn[3];
 153       break;
 154    case GL_INTENSITY:
 155       colorOut[0] = colorOut[1] = colorOut[2] = colorOut[3] = colorIn[0];
 156       break;
 157    default:
 158       COPY_4V(colorOut, colorIn);
 159    }
 160 }
 161
 162
 163 static void
 164 update_samplers(struct st_context *st)
 165 {
 166    struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
 167    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 168    const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
 169                                     fprog->Base.SamplersUsed);
 170    GLuint su;
 171
 172    st->state.num_samplers = 0;
 173
 174    /* loop over sampler units (aka tex image units) */
 175    for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
 176       struct pipe_sampler_state *sampler = st->state.samplers + su;
 177
 178       memset(sampler, 0, sizeof(*sampler));
 179
 180       if (samplersUsed & (1 << su)) {
 181          struct gl_texture_object *texobj;
 182          struct gl_texture_image *teximg;
 183          GLuint texUnit;
 184
 185          if (fprog->Base.SamplersUsed & (1 << su))
 186             texUnit = fprog->Base.SamplerUnits[su];
 187          else
 188             texUnit = vprog->Base.SamplerUnits[su];
 189
 190          texobj = st->ctx->Texture.Unit[texUnit]._Current;
 191          if (!texobj) {
 192             texobj = st_get_default_texture(st);
 193          }
 194
 195          teximg = texobj->Image[0][texobj->BaseLevel];
 196
 197          sampler->wrap_s = gl_wrap_xlate(texobj->WrapS);
 198          sampler->wrap_t = gl_wrap_xlate(texobj->WrapT);
 199          sampler->wrap_r = gl_wrap_xlate(texobj->WrapR);
 200
 201          sampler->min_img_filter = gl_filter_to_img_filter(texobj->MinFilter);
 202          sampler->min_mip_filter = gl_filter_to_mip_filter(texobj->MinFilter);
 203          sampler->mag_img_filter = gl_filter_to_img_filter(texobj->MagFilter);
 204
 205          if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 206             sampler->normalized_coords = 1;
 207
 208          sampler->lod_bias = st->ctx->Texture.Unit[su].LodBias;
 209
 210          sampler->min_lod = texobj->BaseLevel + texobj->MinLod;
 211          if (sampler->min_lod < texobj->BaseLevel)
 212             sampler->min_lod = texobj->BaseLevel;
 213
 214          sampler->max_lod = MIN2((GLfloat) texobj->MaxLevel,
 215                                  (texobj->MaxLod + texobj->BaseLevel));
 216          if (sampler->max_lod < sampler->min_lod) {
 217             /* The GL spec doesn't seem to specify what to do in this case.
 218              * Swap the values.
 219              */
 220             float tmp = sampler->max_lod;
 221             sampler->max_lod = sampler->min_lod;
 222             sampler->min_lod = tmp;
 223             assert(sampler->min_lod <= sampler->max_lod);
 224          }
 225
 226          xlate_border_color(texobj->BorderColor.f,
 227                             teximg ? teximg->_BaseFormat : GL_RGBA,
 228                             sampler->border_color);
 229
 230          sampler->max_anisotropy = (texobj->MaxAnisotropy == 1.0 ? 0 : (GLuint)texobj->MaxAnisotropy);
 231
 232          /* only care about ARB_shadow, not SGI shadow */
 233          if (texobj->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 234             sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 235             sampler->compare_func
 236                = st_compare_func_to_pipe(texobj->CompareFunc);
 237          }
 238
 239          st->state.num_samplers = su + 1;
 240
 241          /*printf("%s su=%u non-null\n", __FUNCTION__, su);*/
 242          cso_single_sampler(st->cso_context, su, sampler);
 243          if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
 244             cso_single_vertex_sampler(st->cso_context, su, sampler);
 245          }
 246       }
 247       else {
 248          /*printf("%s su=%u null\n", __FUNCTION__, su);*/
 249          cso_single_sampler(st->cso_context, su, NULL);
 250          if (su < st->ctx->Const.MaxVertexTextureImageUnits) {
 251             cso_single_vertex_sampler(st->cso_context, su, NULL);
 252          }
 253       }
 254    }
 255
 256    cso_single_sampler_done(st->cso_context);
 257    if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {
 258       cso_single_vertex_sampler_done(st->cso_context);
 259    }
 260 }
 261
 262
 263 const struct st_tracked_state st_update_sampler = {
 264    "st_update_sampler",                                 /* name */
 265    {                                                    /* dirty */
 266       _NEW_TEXTURE,                                     /* mesa */
 267       0,                                                /* st */
 268    },
 269    update_samplers                                      /* update */
 270 };