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