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 /**
  50  * Combine depth texture mode with "swizzle" so that depth mode swizzling
  51  * takes place before texture swizzling, and return the resulting swizzle.
  52  * If the format is not a depth format, return "swizzle" unchanged.
  53  *
  54  * \param format     PIPE_FORMAT_*.
  55  * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.
  56  * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA, GL_RED.
  57  */
  58 static GLuint
  59 apply_depthmode(enum pipe_format format, GLuint swizzle, GLenum depthmode)
  60 {
  61    const struct util_format_description *desc =
  62          util_format_description(format);
  63    unsigned char swiz[4];
  64    unsigned i;
  65
  66    if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS ||
  67        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) {
  68       /* Not a depth format. */
  69       return swizzle;
  70    }
  71
  72    for (i = 0; i < 4; i++)
  73       swiz[i] = GET_SWZ(swizzle, i);
  74
  75    switch (depthmode) {
  76       case GL_LUMINANCE:
  77          /* Rewrite reads from W to ONE, and reads from XYZ to XXX. */
  78          for (i = 0; i < 4; i++)
  79             if (swiz[i] == SWIZZLE_W)
  80                swiz[i] = SWIZZLE_ONE;
  81             else if (swiz[i] < SWIZZLE_W)
  82                swiz[i] = SWIZZLE_X;
  83          break;
  84
  85       case GL_INTENSITY:
  86          /* Rewrite reads from XYZW to XXXX. */
  87          for (i = 0; i < 4; i++)
  88             if (swiz[i] <= SWIZZLE_W)
  89                swiz[i] = SWIZZLE_X;
  90          break;
  91
  92       case GL_ALPHA:
  93          /* Rewrite reads from W to X, and reads from XYZ to 000. */
  94          for (i = 0; i < 4; i++)
  95             if (swiz[i] == SWIZZLE_W)
  96                swiz[i] = SWIZZLE_X;
  97             else if (swiz[i] < SWIZZLE_W)
  98                swiz[i] = SWIZZLE_ZERO;
  99          break;
 100       case GL_RED:
 101          /* Rewrite reads W to 1, XYZ to X00 */
 102          for (i = 0; i < 4; i++)
 103             if (swiz[i] == SWIZZLE_W)
 104                swiz[i] = SWIZZLE_ONE;
 105             else if (swiz[i] == SWIZZLE_Y || swiz[i] == SWIZZLE_Z)
 106                swiz[i] = SWIZZLE_ZERO;
 107          break;
 108    }
 109
 110    return MAKE_SWIZZLE4(swiz[0], swiz[1], swiz[2], swiz[3]);
 111 }
 112
 113
 114 /**
 115  * Return TRUE if the swizzling described by "swizzle" and
 116  * "depthmode" (for depth textures only) is different from the swizzling
 117  * set in the given sampler view.
 118  *
 119  * \param sv         A sampler view.
 120  * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.
 121  * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA.
 122  */
 123 static boolean
 124 check_sampler_swizzle(struct pipe_sampler_view *sv,
 125                       GLuint swizzle, GLenum depthmode)
 126 {
 127    swizzle = apply_depthmode(sv->texture->format, swizzle, depthmode);
 128
 129    if ((sv->swizzle_r != GET_SWZ(swizzle, 0)) ||
 130        (sv->swizzle_g != GET_SWZ(swizzle, 1)) ||
 131        (sv->swizzle_b != GET_SWZ(swizzle, 2)) ||
 132        (sv->swizzle_a != GET_SWZ(swizzle, 3)))
 133       return TRUE;
 134    return FALSE;
 135 }
 136
 137
 138 static INLINE struct pipe_sampler_view *
 139 st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
 140                                           struct st_texture_object *stObj,
 141                                           enum pipe_format format)
 142 {
 143    struct pipe_sampler_view templ;
 144    GLuint swizzle = apply_depthmode(stObj->pt->format,
 145                                     stObj->base._Swizzle,
 146                                     stObj->base.DepthMode);
 147
 148    u_sampler_view_default_template(&templ,
 149                                    stObj->pt,
 150                                    format);
 151
 152    if (swizzle != SWIZZLE_NOOP) {
 153       templ.swizzle_r = GET_SWZ(swizzle, 0);
 154       templ.swizzle_g = GET_SWZ(swizzle, 1);
 155       templ.swizzle_b = GET_SWZ(swizzle, 2);
 156       templ.swizzle_a = GET_SWZ(swizzle, 3);
 157    }
 158
 159    return pipe->create_sampler_view(pipe, stObj->pt, &templ);
 160 }
 161
 162
 163 static INLINE struct pipe_sampler_view *
 164 st_get_texture_sampler_view_from_stobj(struct st_texture_object *stObj,
 165                                        struct pipe_context *pipe,
 166                                        enum pipe_format format)
 167 {
 168    if (!stObj || !stObj->pt) {
 169       return NULL;
 170    }
 171
 172    if (!stObj->sampler_view) {
 173       stObj->sampler_view =
 174          st_create_texture_sampler_view_from_stobj(pipe, stObj, format);
 175    }
 176
 177    return stObj->sampler_view;
 178 }
 179
 180
 181 static void
 182 update_textures(struct st_context *st)
 183 {
 184    struct pipe_context *pipe = st->pipe;
 185    struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
 186    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 187    const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
 188                                     fprog->Base.SamplersUsed);
 189    GLuint su;
 190
 191    st->state.num_textures = 0;
 192
 193    /* loop over sampler units (aka tex image units) */
 194    for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
 195       struct pipe_sampler_view *sampler_view = NULL;
 196       enum pipe_format st_view_format;
 197       if (samplersUsed & (1 << su)) {
 198          struct gl_texture_object *texObj;
 199          struct st_texture_object *stObj;
 200          GLboolean retval;
 201          GLuint texUnit;
 202
 203          if (fprog->Base.SamplersUsed & (1 << su))
 204             texUnit = fprog->Base.SamplerUnits[su];
 205          else
 206             texUnit = vprog->Base.SamplerUnits[su];
 207
 208          texObj = st->ctx->Texture.Unit[texUnit]._Current;
 209
 210          if (!texObj) {
 211             texObj = st_get_default_texture(st);
 212          }
 213          stObj = st_texture_object(texObj);
 214
 215          retval = st_finalize_texture(st->ctx, st->pipe, texObj);
 216          if (!retval) {
 217             /* out of mem */
 218             continue;
 219          }
 220
 221          /* Determine the format of the texture sampler view */
 222          st_view_format = stObj->pt->format;
 223          {
 224             const struct st_texture_image *firstImage =
 225                st_texture_image(stObj->base.Image[0][stObj->base.BaseLevel]);
 226             const gl_format texFormat = firstImage->base.TexFormat;
 227             enum pipe_format firstImageFormat =
 228                st_mesa_format_to_pipe_format(texFormat);
 229
 230             if ((stObj->base.sRGBDecode == GL_SKIP_DECODE_EXT) &&
 231                 (_mesa_get_format_color_encoding(texFormat) == GL_SRGB)) {
 232                /* don't do sRGB->RGB conversion.  Interpret the texture
 233                 * texture data as linear values.
 234                 */
 235                const gl_format linearFormat =
 236                   _mesa_get_srgb_format_linear(texFormat);
 237                firstImageFormat = st_mesa_format_to_pipe_format(linearFormat);
 238             }
 239
 240             if (firstImageFormat != stObj->pt->format)
 241                st_view_format = firstImageFormat;
 242          }
 243
 244          st->state.num_textures = su + 1;
 245
 246          /* if sampler view has changed dereference it */
 247          if (stObj->sampler_view)
 248             if (check_sampler_swizzle(stObj->sampler_view,
 249                                       stObj->base._Swizzle,
 250                                       stObj->base.DepthMode) ||
 251                 (st_view_format != stObj->sampler_view->format))
 252                pipe_sampler_view_reference(&stObj->sampler_view, NULL);
 253
 254          sampler_view = st_get_texture_sampler_view_from_stobj(stObj, pipe, st_view_format);
 255       }
 256       pipe_sampler_view_reference(&st->state.sampler_views[su], sampler_view);
 257    }
 258
 259    cso_set_fragment_sampler_views(st->cso_context,
 260                                   st->state.num_textures,
 261                                   st->state.sampler_views);
 262    if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {
 263       cso_set_vertex_sampler_views(st->cso_context,
 264                                    MIN2(st->state.num_textures,
 265                                         st->ctx->Const.MaxVertexTextureImageUnits),
 266                                    st->state.sampler_views);
 267    }
 268 }
 269
 270
 271 const struct st_tracked_state st_update_texture = {
 272    "st_update_texture",                                 /* name */
 273    {                                                    /* dirty */
 274       _NEW_TEXTURE,                                     /* mesa */
 275       ST_NEW_FRAGMENT_PROGRAM,                          /* st */
 276    },
 277    update_textures                                      /* update */
 278 };
 279
 280
 281
 282
 283 static void
 284 finalize_textures(struct st_context *st)
 285 {
 286    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
 287    const GLboolean prev_missing_textures = st->missing_textures;
 288    GLuint su;
 289
 290    st->missing_textures = GL_FALSE;
 291
 292    for (su = 0; su < st->ctx->Const.MaxTextureCoordUnits; su++) {
 293       if (fprog->Base.SamplersUsed & (1 << su)) {
 294          const GLuint texUnit = fprog->Base.SamplerUnits[su];
 295          struct gl_texture_object *texObj
 296             = st->ctx->Texture.Unit[texUnit]._Current;
 297
 298          if (texObj) {
 299             GLboolean retval;
 300
 301             retval = st_finalize_texture(st->ctx, st->pipe, texObj);
 302             if (!retval) {
 303                /* out of mem */
 304                st->missing_textures = GL_TRUE;
 305                continue;
 306             }
 307          }
 308       }
 309    }
 310
 311    if (prev_missing_textures != st->missing_textures)
 312       st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
 313 }
 314
 315
 316
 317 const struct st_tracked_state st_finalize_textures = {
 318    "st_finalize_textures",              /* name */
 319    {                                    /* dirty */
 320       _NEW_TEXTURE,                     /* mesa */
 321       0,                                /* st */
 322    },
 323    finalize_textures                    /* update */
 324 };