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 #include "main/mtypes.h"
  37 #include "main/glformats.h"
  38 #include "main/samplerobj.h"
  39 #include "main/texobj.h"
  40
  41 #include "st_context.h"
  42 #include "st_cb_texture.h"
  43 #include "st_format.h"
  44 #include "st_atom.h"
  45 #include "st_texture.h"
  46 #include "pipe/p_context.h"
  47 #include "pipe/p_defines.h"
  48
  49 #include "cso_cache/cso_context.h"
  50
  51
  52 /**
  53  * Convert GLenum texcoord wrap tokens to pipe tokens.
  54  */
  55 static GLuint
  56 gl_wrap_xlate(GLenum wrap)
  57 {
  58    switch (wrap) {
  59    case GL_REPEAT:
  60       return PIPE_TEX_WRAP_REPEAT;
  61    case GL_CLAMP:
  62       return PIPE_TEX_WRAP_CLAMP;
  63    case GL_CLAMP_TO_EDGE:
  64       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  65    case GL_CLAMP_TO_BORDER:
  66       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  67    case GL_MIRRORED_REPEAT:
  68       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  69    case GL_MIRROR_CLAMP_EXT:
  70       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  71    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  72       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  73    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  74       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  75    default:
  76       assert(0);
  77       return 0;
  78    }
  79 }
  80
  81
  82 static GLuint
  83 gl_filter_to_mip_filter(GLenum filter)
  84 {
  85    switch (filter) {
  86    case GL_NEAREST:
  87    case GL_LINEAR:
  88       return PIPE_TEX_MIPFILTER_NONE;
  89
  90    case GL_NEAREST_MIPMAP_NEAREST:
  91    case GL_LINEAR_MIPMAP_NEAREST:
  92       return PIPE_TEX_MIPFILTER_NEAREST;
  93
  94    case GL_NEAREST_MIPMAP_LINEAR:
  95    case GL_LINEAR_MIPMAP_LINEAR:
  96       return PIPE_TEX_MIPFILTER_LINEAR;
  97
  98    default:
  99       assert(0);
 100       return PIPE_TEX_MIPFILTER_NONE;
 101    }
 102 }
 103
 104
 105 static GLuint
 106 gl_filter_to_img_filter(GLenum filter)
 107 {
 108    switch (filter) {
 109    case GL_NEAREST:
 110    case GL_NEAREST_MIPMAP_NEAREST:
 111    case GL_NEAREST_MIPMAP_LINEAR:
 112       return PIPE_TEX_FILTER_NEAREST;
 113
 114    case GL_LINEAR:
 115    case GL_LINEAR_MIPMAP_NEAREST:
 116    case GL_LINEAR_MIPMAP_LINEAR:
 117       return PIPE_TEX_FILTER_LINEAR;
 118
 119    default:
 120       assert(0);
 121       return PIPE_TEX_FILTER_NEAREST;
 122    }
 123 }
 124
 125
 126 static void
 127 convert_sampler(struct st_context *st,
 128                 struct pipe_sampler_state *sampler,
 129                 GLuint texUnit)
 130 {
 131    struct gl_texture_object *texobj;
 132    struct gl_context *ctx = st->ctx;
 133    struct gl_sampler_object *msamp;
 134
 135    texobj = ctx->Texture.Unit[texUnit]._Current;
 136    if (!texobj) {
 137       texobj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
 138    }
 139
 140    msamp = _mesa_get_samplerobj(ctx, texUnit);
 141
 142    memset(sampler, 0, sizeof(*sampler));
 143    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 144    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 145    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 146
 147    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 148    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 149    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 150
 151    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 152       sampler->normalized_coords = 1;
 153
 154    sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
 155
 156    sampler->min_lod = CLAMP(msamp->MinLod,
 157                             0.0f,
 158                             (GLfloat) texobj->MaxLevel - texobj->BaseLevel);
 159    sampler->max_lod = MIN2((GLfloat) texobj->MaxLevel - texobj->BaseLevel,
 160                            msamp->MaxLod);
 161    if (sampler->max_lod < sampler->min_lod) {
 162       /* The GL spec doesn't seem to specify what to do in this case.
 163        * Swap the values.
 164        */
 165       float tmp = sampler->max_lod;
 166       sampler->max_lod = sampler->min_lod;
 167       sampler->min_lod = tmp;
 168       assert(sampler->min_lod <= sampler->max_lod);
 169    }
 170
 171    if (msamp->BorderColor.ui[0] ||
 172        msamp->BorderColor.ui[1] ||
 173        msamp->BorderColor.ui[2] ||
 174        msamp->BorderColor.ui[3]) {
 175       struct gl_texture_image *teximg;
 176       GLboolean is_integer = GL_FALSE;
 177
 178       teximg = texobj->Image[0][texobj->BaseLevel];
 179
 180       if (teximg) {
 181          is_integer = _mesa_is_enum_format_integer(teximg->InternalFormat);
 182       }
 183
 184       st_translate_color(&msamp->BorderColor,
 185                          &sampler->border_color,
 186                          teximg ? teximg->_BaseFormat : GL_RGBA, is_integer);
 187    }
 188
 189    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 190                               0 : (GLuint) msamp->MaxAnisotropy);
 191
 192    /* only care about ARB_shadow, not SGI shadow */
 193    if (msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 194       sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 195       sampler->compare_func
 196          = st_compare_func_to_pipe(msamp->CompareFunc);
 197    }
 198
 199    sampler->seamless_cube_map =
 200       ctx->Texture.CubeMapSeamless || msamp->CubeMapSeamless;
 201 }
 202
 203
 204 /**
 205  * Update the gallium driver's sampler state for fragment, vertex or
 206  * geometry shader stage.
 207  */
 208 static void
 209 update_shader_samplers(struct st_context *st,
 210                        unsigned shader_stage,
 211                        const struct gl_program *prog,
 212                        unsigned max_units,
 213                        struct pipe_sampler_state *samplers,
 214                        unsigned *num_samplers)
 215 {
 216    GLuint unit;
 217    GLbitfield samplers_used;
 218    const GLuint old_max = *num_samplers;
 219
 220    samplers_used = prog->SamplersUsed;
 221
 222    if (*num_samplers == 0 && samplers_used == 0x0)
 223        return;
 224
 225    *num_samplers = 0;
 226
 227    /* loop over sampler units (aka tex image units) */
 228    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 229       struct pipe_sampler_state *sampler = samplers + unit;
 230
 231       if (samplers_used & 1) {
 232          const GLuint texUnit = prog->SamplerUnits[unit];
 233
 234          convert_sampler(st, sampler, texUnit);
 235
 236          *num_samplers = unit + 1;
 237
 238          cso_single_sampler(st->cso_context, shader_stage, unit, sampler);
 239       }
 240       else if (samplers_used != 0 || unit < old_max) {
 241          cso_single_sampler(st->cso_context, shader_stage, unit, NULL);
 242       }
 243       else {
 244          /* if we've reset all the old samplers and we have no more new ones */
 245          break;
 246       }
 247    }
 248
 249    cso_single_sampler_done(st->cso_context, shader_stage);
 250 }
 251
 252
 253 static void
 254 update_samplers(struct st_context *st)
 255 {
 256    const struct gl_context *ctx = st->ctx;
 257
 258    update_shader_samplers(st,
 259                           PIPE_SHADER_FRAGMENT,
 260                           &ctx->FragmentProgram._Current->Base,
 261                           ctx->Const.MaxTextureImageUnits,
 262                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 263                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 264
 265    update_shader_samplers(st,
 266                           PIPE_SHADER_VERTEX,
 267                           &ctx->VertexProgram._Current->Base,
 268                           ctx->Const.MaxVertexTextureImageUnits,
 269                           st->state.samplers[PIPE_SHADER_VERTEX],
 270                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 271
 272    if (ctx->GeometryProgram._Current) {
 273       update_shader_samplers(st,
 274                              PIPE_SHADER_GEOMETRY,
 275                              &ctx->GeometryProgram._Current->Base,
 276                              ctx->Const.MaxGeometryTextureImageUnits,
 277                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 278                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 279    }
 280 }
 281
 282
 283 const struct st_tracked_state st_update_sampler = {
 284    "st_update_sampler",                                 /* name */
 285    {                                                    /* dirty */
 286       _NEW_TEXTURE,                                     /* mesa */
 287       0,                                                /* st */
 288    },
 289    update_samplers                                      /* update */
 290 };