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 "st_context.h"
  36 #include "st_atom.h"
  37 #include "st_texture.h"
  38 #include "st_cb_texture.h"
  39 #include "pipe/p_context.h"
  40 #include "pipe/p_inlines.h"
  41 #include "cso_cache/cso_context.h"
  42 #include "util/u_simple_shaders.h"
  43
  44
  45 static void *
  46 get_passthrough_fs(struct st_context *st)
  47 {
  48    struct pipe_shader_state shader;
  49
  50    if (!st->passthrough_fs) {
  51       st->passthrough_fs =
  52          util_make_fragment_passthrough_shader(st->pipe, &shader);
  53       free((void *) shader.tokens);
  54    }
  55
  56    return st->passthrough_fs;
  57 }
  58
  59
  60 /**
  61  * XXX This needs some work yet....
  62  * Need to "upload" texture images at appropriate times.
  63  */
  64 static void
  65 update_textures(struct st_context *st)
  66 {
  67    struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
  68    GLuint su;
  69    GLboolean missing_textures = GL_FALSE;
  70
  71    st->state.num_textures = 0;
  72
  73    for (su = 0; su < st->ctx->Const.MaxTextureCoordUnits; su++) {
  74       struct pipe_texture *pt = NULL;
  75
  76       if (fprog->Base.SamplersUsed & (1 << su)) {
  77          const GLuint texUnit = fprog->Base.SamplerUnits[su];
  78          struct gl_texture_object *texObj
  79             = st->ctx->Texture.Unit[texUnit]._Current;
  80          struct st_texture_object *stObj = st_texture_object(texObj);
  81
  82          if (texObj) {
  83             GLboolean flush, retval;
  84
  85             retval = st_finalize_texture(st->ctx, st->pipe, texObj, &flush);
  86             if (!retval) {
  87                /* out of mem */
  88                missing_textures = GL_TRUE;
  89                continue;
  90             }
  91
  92             st->state.num_textures = su + 1;
  93
  94             stObj->teximage_realloc = TRUE;
  95          }
  96
  97          pt = st_get_stobj_texture(stObj);
  98       }
  99
 100       pipe_texture_reference(&st->state.sampler_texture[su], pt);
 101    }
 102
 103    cso_set_sampler_textures(st->cso_context,
 104                             st->state.num_textures,
 105                             st->state.sampler_texture);
 106
 107    if (missing_textures) {
 108       /* use a pass-through frag shader that uses no textures */
 109       void *fs = get_passthrough_fs(st);
 110       cso_set_fragment_shader_handle(st->cso_context, fs);
 111    }
 112 }
 113
 114
 115 const struct st_tracked_state st_update_texture = {
 116    "st_update_texture",                                 /* name */
 117    {                                                    /* dirty */
 118       _NEW_TEXTURE,                                     /* mesa */
 119       ST_NEW_FRAGMENT_PROGRAM,                          /* st */
 120    },
 121    update_textures                                      /* update */
 122 };