src/mesa/state_tracker/st_atom_texture.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 "program/prog_instruction.h"
  37
  38 #include "st_context.h"
  39 #include "st_atom.h"
  40 #include "st_texture.h"
  41 #include "st_format.h"
  42 #include "st_cb_texture.h"
  43 #include "pipe/p_context.h"
  44 #include "util/u_format.h"
  45 #include "util/u_inlines.h"
  46 #include "cso_cache/cso_context.h"
  47
  48 /**
  49  * Combine depth texture mode with "swizzle" so that depth mode swizzling
  50  * takes place before texture swizzling, and return the resulting swizzle.
  51  * If the format is not a depth format, return "swizzle" unchanged.
  52  *
  53  * \param format     PIPE_FORMAT_*.
  54  * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.
  55  * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA, GL_RED.
  56  */
  57 static GLuint apply_depthmode(enum pipe_format format,
  58                               GLuint swizzle, GLenum depthmode)
  59 {
  60    const struct util_format_description *desc =
  61          util_format_description(format);
  62    unsigned char swiz[4];
  63    unsigned i;
  64
  65    if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS ||
  66        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) {
  67       /* Not a depth format. */
  68       return swizzle;
  69    }
  70
  71    for (i = 0; i < 4; i++)
  72       swiz[i] = GET_SWZ(swizzle, i);
  73
  74    switch (depthmode) {
  75       case GL_LUMINANCE:
  76          /* Rewrite reads from W to ONE, and reads from XYZ to XXX. */
  77          for (i = 0; i < 4; i++)
  78             if (swiz[i] == SWIZZLE_W)
  79                swiz[i] = SWIZZLE_ONE;
  80             else if (swiz[i] < SWIZZLE_W)
  81                swiz[i] = SWIZZLE_X;
  82          break;
  83
  84       case GL_INTENSITY:
  85          /* Rewrite reads from XYZW to XXXX. */
  86          for (i = 0; i < 4; i++)
  87             if (swiz[i] <= SWIZZLE_W)
  88                swiz[i] = SWIZZLE_X;
  89          break;
  90
  91       case GL_ALPHA:
  92          /* Rewrite reads from W to X, and reads from XYZ to 000. */
  93          for (i = 0; i < 4; i++)
  94             if (swiz[i] == SWIZZLE_W)
  95                swiz[i] = SWIZZLE_X;
  96             else if (swiz[i] < SWIZZLE_W)
  97                swiz[i] = SWIZZLE_ZERO;
  98          break;
  99       case GL_RED:
 100          /* Rewrite reads W to 1, XYZ to X00 */
 101          for (i = 0; i < 4; i++)
 102             if (swiz[i] == SWIZZLE_W)
 103                swiz[i] = SWIZZLE_ONE;
 104             else if (swiz[i] == SWIZZLE_Y || swiz[i] == SWIZZLE_Z)
 105                swiz[i] = SWIZZLE_ZERO;
 106          break;
 107    }
 108
 109    return MAKE_SWIZZLE4(swiz[0], swiz[1], swiz[2], swiz[3]);
 110 }
 111
 112 /**
 113  * Return TRUE if the swizzling described by "swizzle" and
 114  * "depthmode" (for depth textures only) is different from the swizzling
 115  * set in the given sampler view.
 116  *
 117  * \param sv         A sampler view.
 118  * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.
 119  * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA.
 120  */
 121 static boolean check_sampler_swizzle(struct pipe_sampler_view *sv,
 122                                      GLuint swizzle, GLenum depthmode)
 123 {
 124    swizzle = apply_depthmode(sv->texture->format, swizzle, depthmode);
 125
 126    if ((sv->swizzle_r != GET_SWZ(swizzle, 0)) ||
 127        (sv->swizzle_g != GET_SWZ(swizzle, 1)) ||
 128        (sv->swizzle_b != GET_SWZ(swizzle, 2)) ||
 129        (sv->swizzle_a != GET_SWZ(swizzle, 3)))
 130       return true;
 131    return false;
 132 }
 133
 134 static INLINE struct pipe_sampler_view *
 135 st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
 136                                           struct st_texture_object *stObj,
 137                                           enum pipe_format format)
 138
 139 {
 140    struct pipe_sampler_view templ;
 141    GLuint swizzle = apply_depthmode(stObj->pt->format,
 142                                     stObj->base._Swizzle,
 143                                     stObj->base.DepthMode);
 144
 145    u_sampler_view_default_template(&templ,
 146                                    stObj->pt,
 147                                    format);
 148
 149    if (swizzle != SWIZZLE_NOOP) {
 150       templ.swizzle_r = GET_SWZ(swizzle, 0);
 151       templ.swizzle_g = GET_SWZ(swizzle, 1);
 152       templ.swizzle_b = GET_SWZ(swizzle, 2);
 153       templ.swizzle_a = GET_SWZ(swizzle, 3);
 154    }
 155
 156    return pipe->create_sampler_view(pipe, stObj->pt, &templ);
 157 }
 158
 159
 160 static INLINE struct pipe_sampler_view *
 161 st_get_texture_sampler_view_from_stobj(struct st_texture_object *stObj,
 162                                        struct pipe_context *pipe,
 163                                        enum pipe_format format)
 164
 165 {
 166    if (!stObj || !stObj->pt) {
 167       return NULL;
 168    }
 169
 170    if (!stObj->sampler_view) {
 171       stObj->sampler_view = st_create_texture_sampler_view_from_stobj(pipe, stObj, format);
 172    }
 173
 174    return stObj->sampler_view;
 175 }
 176
 177 static void
 178 update_textures(struct st_context *st)
 179 {
 180    struct pipe_context *pipe = st->pipe;
 181    struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
 182    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 183    const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
 184                                     fprog->Base.SamplersUsed);
 185    GLuint su;
 186
 187    st->state.num_textures = 0;
 188
 189    /* loop over sampler units (aka tex image units) */
 190    for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
 191       struct pipe_sampler_view *sampler_view = NULL;
 192       enum pipe_format st_view_format;
 193       if (samplersUsed & (1 << su)) {
 194          struct gl_texture_object *texObj;
 195          struct st_texture_object *stObj;
 196          GLboolean retval;
 197          GLuint texUnit;
 198
 199          if (fprog->Base.SamplersUsed & (1 << su))
 200             texUnit = fprog->Base.SamplerUnits[su];
 201          else
 202             texUnit = vprog->Base.SamplerUnits[su];
 203
 204          texObj = st->ctx->Texture.Unit[texUnit]._Current;
 205
 206          if (!texObj) {
 207             texObj = st_get_default_texture(st);
 208          }
 209          stObj = st_texture_object(texObj);
 210
 211          retval = st_finalize_texture(st->ctx, st->pipe, texObj);
 212          if (!retval) {
 213             /* out of mem */
 214             continue;
 215          }
 216
 217          st_view_format = stObj->pt->format;
 218          {
 219             struct st_texture_image *firstImage;
 220             enum pipe_format firstImageFormat;
 221             firstImage = st_texture_image(stObj->base.Image[0][stObj->base.BaseLevel]);
 222
 223             firstImageFormat = st_mesa_format_to_pipe_format(firstImage->base.TexFormat);
 224             if (firstImageFormat != stObj->pt->format)
 225                st_view_format = firstImageFormat;
 226
 227          }
 228          st->state.num_textures = su + 1;
 229
 230          /* if sampler view has changed dereference it */
 231          if (stObj->sampler_view)
 232             if (check_sampler_swizzle(stObj->sampler_view,
 233                                       stObj->base._Swizzle,
 234                                       stObj->base.DepthMode) ||
 235                 (st_view_format != stObj->sampler_view->format))
 236                pipe_sampler_view_reference(&stObj->sampler_view, NULL);
 237
 238          sampler_view = st_get_texture_sampler_view_from_stobj(stObj, pipe, st_view_format);
 239       }
 240       pipe_sampler_view_reference(&st->state.sampler_views[su], sampler_view);
 241    }
 242
 243    cso_set_fragment_sampler_views(st->cso_context,
 244                                   st->state.num_textures,
 245                                   st->state.sampler_views);
 246    if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {
 247       cso_set_vertex_sampler_views(st->cso_context,
 248                                    MIN2(st->state.num_textures,
 249                                         st->ctx->Const.MaxVertexTextureImageUnits),
 250                                    st->state.sampler_views);
 251    }
 252 }
 253
 254
 255 const struct st_tracked_state st_update_texture = {
 256    "st_update_texture",                                 /* name */
 257    {                                                    /* dirty */
 258       _NEW_TEXTURE,                                     /* mesa */
 259       ST_NEW_FRAGMENT_PROGRAM,                          /* st */
 260    },
 261    update_textures                                      /* update */
 262 };
 263
 264
 265
 266
 267 static void
 268 finalize_textures(struct st_context *st)
 269 {
 270    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 271    const GLboolean prev_missing_textures = st->missing_textures;
 272    GLuint su;
 273
 274    st->missing_textures = GL_FALSE;
 275
 276    for (su = 0; su < st->ctx->Const.MaxTextureCoordUnits; su++) {
 277       if (fprog->Base.SamplersUsed & (1 << su)) {
 278          const GLuint texUnit = fprog->Base.SamplerUnits[su];
 279          struct gl_texture_object *texObj
 280             = st->ctx->Texture.Unit[texUnit]._Current;
 281
 282          if (texObj) {
 283             GLboolean retval;
 284
 285             retval = st_finalize_texture(st->ctx, st->pipe, texObj);
 286             if (!retval) {
 287                /* out of mem */
 288                st->missing_textures = GL_TRUE;
 289                continue;
 290             }
 291          }
 292       }
 293    }
 294
 295    if (prev_missing_textures != st->missing_textures)
 296       st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
 297 }
 298
 299
 300
 301 const struct st_tracked_state st_finalize_textures = {
 302    "st_finalize_textures",              /* name */
 303    {                                    /* dirty */
 304       _NEW_TEXTURE,                     /* mesa */
 305       0,                                /* st */
 306    },
 307    finalize_textures                    /* update */
 308 };