src/mesa/state_tracker/st_atom_texture.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 <keithw@vmware.com>
  31   *   Brian Paul
  32   */
  33
  34
  35 #include "main/context.h"
  36 #include "main/macros.h"
  37 #include "main/mtypes.h"
  38 #include "main/samplerobj.h"
  39 #include "main/teximage.h"
  40 #include "main/texobj.h"
  41 #include "program/prog_instruction.h"
  42
  43 #include "st_context.h"
  44 #include "st_atom.h"
  45 #include "st_sampler_view.h"
  46 #include "st_texture.h"
  47 #include "st_format.h"
  48 #include "st_cb_texture.h"
  49 #include "pipe/p_context.h"
  50 #include "util/u_format.h"
  51 #include "util/u_inlines.h"
  52 #include "cso_cache/cso_context.h"
  53
  54
  55 /**
  56  * Get a pipe_sampler_view object from a texture unit.
  57  */
  58 void
  59 st_update_single_texture(struct st_context *st,
  60                          struct pipe_sampler_view **sampler_view,
  61                          GLuint texUnit, bool glsl130_or_later,
  62                          bool ignore_srgb_decode)
  63 {
  64    struct gl_context *ctx = st->ctx;
  65    const struct gl_sampler_object *samp;
  66    struct gl_texture_object *texObj;
  67    struct st_texture_object *stObj;
  68
  69    samp = _mesa_get_samplerobj(ctx, texUnit);
  70
  71    texObj = ctx->Texture.Unit[texUnit]._Current;
  72    assert(texObj);
  73
  74    stObj = st_texture_object(texObj);
  75
  76    if (unlikely(texObj->Target == GL_TEXTURE_BUFFER)) {
  77       *sampler_view = st_get_buffer_sampler_view_from_stobj(st, stObj);
  78       return;
  79    }
  80
  81    if (!st_finalize_texture(ctx, st->pipe, texObj, 0) ||
  82        !stObj->pt) {
  83       /* out of mem */
  84       *sampler_view = NULL;
  85       return;
  86    }
  87
  88    if (texObj->TargetIndex == TEXTURE_EXTERNAL_INDEX &&
  89        stObj->pt->screen->resource_changed)
  90          stObj->pt->screen->resource_changed(stObj->pt->screen, stObj->pt);
  91
  92    *sampler_view =
  93       st_get_texture_sampler_view_from_stobj(st, stObj, samp,
  94                                              glsl130_or_later,
  95                                              ignore_srgb_decode);
  96 }
  97
  98
  99
 100 static void
 101 update_textures(struct st_context *st,
 102                 enum pipe_shader_type shader_stage,
 103                 const struct gl_program *prog,
 104                 struct pipe_sampler_view **sampler_views,
 105                 unsigned *out_num_textures)
 106 {
 107    const GLuint old_max = *out_num_textures;
 108    GLbitfield samplers_used = prog->SamplersUsed;
 109    GLbitfield texel_fetch_samplers = prog->info.textures_used_by_txf;
 110    GLbitfield free_slots = ~prog->SamplersUsed;
 111    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 112    GLuint unit;
 113
 114    if (samplers_used == 0x0 && old_max == 0)
 115       return;
 116
 117    unsigned num_textures = 0;
 118
 119    /* prog->sh.data is NULL if it's ARB_fragment_program */
 120    bool glsl130 = (prog->sh.data ? prog->sh.data->Version : 0) >= 130;
 121
 122    /* loop over sampler units (aka tex image units) */
 123    for (unit = 0; samplers_used || unit < old_max;
 124         unit++, samplers_used >>= 1, texel_fetch_samplers >>= 1) {
 125       struct pipe_sampler_view *sampler_view = NULL;
 126
 127       if (samplers_used & 1) {
 128          const GLuint texUnit = prog->SamplerUnits[unit];
 129
 130          /* The EXT_texture_sRGB_decode extension says:
 131           *
 132           *    "The conversion of sRGB color space components to linear color
 133           *     space is always performed if the texel lookup function is one
 134           *     of the texelFetch builtin functions.
 135           *
 136           *     Otherwise, if the texel lookup function is one of the texture
 137           *     builtin functions or one of the texture gather functions, the
 138           *     conversion of sRGB color space components to linear color space
 139           *     is controlled by the TEXTURE_SRGB_DECODE_EXT parameter.
 140           *
 141           *     If the TEXTURE_SRGB_DECODE_EXT parameter is DECODE_EXT, the
 142           *     conversion of sRGB color space components to linear color space
 143           *     is performed.
 144           *
 145           *     If the TEXTURE_SRGB_DECODE_EXT parameter is SKIP_DECODE_EXT,
 146           *     the value is returned without decoding. However, if the texture
 147           *     is also [statically] accessed with a texelFetch function, then
 148           *     the result of texture builtin functions and/or texture gather
 149           *     functions may be returned with decoding or without decoding."
 150           *
 151           * Note: the "statically" will be added to the language per
 152           *       https://cvs.khronos.org/bugzilla/show_bug.cgi?id=14934
 153           *
 154           * So we simply ignore the setting entirely for samplers that are
 155           * (statically) accessed with a texelFetch function.
 156           */
 157          st_update_single_texture(st, &sampler_view, texUnit, glsl130,
 158                                   texel_fetch_samplers & 1);
 159          num_textures = unit + 1;
 160       }
 161
 162       pipe_sampler_view_reference(&(sampler_views[unit]), sampler_view);
 163    }
 164
 165    /* For any external samplers with multiplaner YUV, stuff the additional
 166     * sampler views we need at the end.
 167     *
 168     * Trying to cache the sampler view in the stObj looks painful, so just
 169     * re-create the sampler view for the extra planes each time.  Main use
 170     * case is video playback (ie. fps games wouldn't be using this) so I
 171     * guess no point to try to optimize this feature.
 172     */
 173    while (unlikely(external_samplers_used)) {
 174       GLuint unit = u_bit_scan(&external_samplers_used);
 175       GLuint extra = 0;
 176       struct st_texture_object *stObj =
 177             st_get_texture_object(st->ctx, prog, unit);
 178       struct pipe_sampler_view tmpl;
 179
 180       if (!stObj)
 181          continue;
 182
 183       /* use original view as template: */
 184       tmpl = *sampler_views[unit];
 185
 186       switch (st_get_view_format(stObj)) {
 187       case PIPE_FORMAT_NV12:
 188          /* we need one additional R8G8 view: */
 189          tmpl.format = PIPE_FORMAT_RG88_UNORM;
 190          tmpl.swizzle_g = PIPE_SWIZZLE_Y;   /* tmpl from Y plane is R8 */
 191          extra = u_bit_scan(&free_slots);
 192          sampler_views[extra] =
 193                st->pipe->create_sampler_view(st->pipe, stObj->pt->next, &tmpl);
 194          break;
 195       case PIPE_FORMAT_IYUV:
 196          /* we need two additional R8 views: */
 197          tmpl.format = PIPE_FORMAT_R8_UNORM;
 198          extra = u_bit_scan(&free_slots);
 199          sampler_views[extra] =
 200                st->pipe->create_sampler_view(st->pipe, stObj->pt->next, &tmpl);
 201          extra = u_bit_scan(&free_slots);
 202          sampler_views[extra] =
 203                st->pipe->create_sampler_view(st->pipe, stObj->pt->next->next, &tmpl);
 204          break;
 205       default:
 206          break;
 207       }
 208
 209       num_textures = MAX2(num_textures, extra + 1);
 210    }
 211
 212    cso_set_sampler_views(st->cso_context,
 213                          shader_stage,
 214                          num_textures,
 215                          sampler_views);
 216    *out_num_textures = num_textures;
 217 }
 218
 219
 220
 221 void
 222 st_update_vertex_textures(struct st_context *st)
 223 {
 224    const struct gl_context *ctx = st->ctx;
 225
 226    if (ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits > 0) {
 227       update_textures(st,
 228                       PIPE_SHADER_VERTEX,
 229                       ctx->VertexProgram._Current,
 230                       st->state.sampler_views[PIPE_SHADER_VERTEX],
 231                       &st->state.num_sampler_views[PIPE_SHADER_VERTEX]);
 232    }
 233 }
 234
 235
 236 void
 237 st_update_fragment_textures(struct st_context *st)
 238 {
 239    const struct gl_context *ctx = st->ctx;
 240
 241    update_textures(st,
 242                    PIPE_SHADER_FRAGMENT,
 243                    ctx->FragmentProgram._Current,
 244                    st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 245                    &st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 246 }
 247
 248
 249 void
 250 st_update_geometry_textures(struct st_context *st)
 251 {
 252    const struct gl_context *ctx = st->ctx;
 253
 254    if (ctx->GeometryProgram._Current) {
 255       update_textures(st,
 256                       PIPE_SHADER_GEOMETRY,
 257                       ctx->GeometryProgram._Current,
 258                       st->state.sampler_views[PIPE_SHADER_GEOMETRY],
 259                       &st->state.num_sampler_views[PIPE_SHADER_GEOMETRY]);
 260    }
 261 }
 262
 263
 264 void
 265 st_update_tessctrl_textures(struct st_context *st)
 266 {
 267    const struct gl_context *ctx = st->ctx;
 268
 269    if (ctx->TessCtrlProgram._Current) {
 270       update_textures(st,
 271                       PIPE_SHADER_TESS_CTRL,
 272                       ctx->TessCtrlProgram._Current,
 273                       st->state.sampler_views[PIPE_SHADER_TESS_CTRL],
 274                       &st->state.num_sampler_views[PIPE_SHADER_TESS_CTRL]);
 275    }
 276 }
 277
 278
 279 void
 280 st_update_tesseval_textures(struct st_context *st)
 281 {
 282    const struct gl_context *ctx = st->ctx;
 283
 284    if (ctx->TessEvalProgram._Current) {
 285       update_textures(st,
 286                       PIPE_SHADER_TESS_EVAL,
 287                       ctx->TessEvalProgram._Current,
 288                       st->state.sampler_views[PIPE_SHADER_TESS_EVAL],
 289                       &st->state.num_sampler_views[PIPE_SHADER_TESS_EVAL]);
 290    }
 291 }
 292
 293
 294 void
 295 st_update_compute_textures(struct st_context *st)
 296 {
 297    const struct gl_context *ctx = st->ctx;
 298
 299    if (ctx->ComputeProgram._Current) {
 300       update_textures(st,
 301                       PIPE_SHADER_COMPUTE,
 302                       ctx->ComputeProgram._Current,
 303                       st->state.sampler_views[PIPE_SHADER_COMPUTE],
 304                       &st->state.num_sampler_views[PIPE_SHADER_COMPUTE]);
 305    }
 306 }