src/mesa/state_tracker/st_gen_mipmap.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 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 #include "main/imports.h"
  30 #include "main/mipmap.h"
  31 #include "main/teximage.h"
  32
  33 #include "pipe/p_context.h"
  34 #include "pipe/p_defines.h"
  35 #include "util/u_inlines.h"
  36 #include "util/u_format.h"
  37 #include "util/u_gen_mipmap.h"
  38
  39 #include "st_debug.h"
  40 #include "st_context.h"
  41 #include "st_texture.h"
  42 #include "st_gen_mipmap.h"
  43 #include "st_cb_texture.h"
  44
  45
  46 /**
  47  * one-time init for generate mipmap
  48  * XXX Note: there may be other times we need no-op/simple state like this.
  49  * In that case, some code refactoring would be good.
  50  */
  51 void
  52 st_init_generate_mipmap(struct st_context *st)
  53 {
  54    st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);
  55 }
  56
  57
  58 void
  59 st_destroy_generate_mipmap(struct st_context *st)
  60 {
  61    util_destroy_gen_mipmap(st->gen_mipmap);
  62    st->gen_mipmap = NULL;
  63 }
  64
  65
  66 /**
  67  * Generate mipmap levels using hardware rendering.
  68  * \return TRUE if successful, FALSE if not possible
  69  */
  70 static boolean
  71 st_render_mipmap(struct st_context *st,
  72                  GLenum target,
  73                  struct st_texture_object *stObj,
  74                  uint baseLevel, uint lastLevel)
  75 {
  76    struct pipe_context *pipe = st->pipe;
  77    struct pipe_screen *screen = pipe->screen;
  78    struct pipe_sampler_view *psv = st_get_texture_sampler_view(stObj, pipe);
  79    const uint face = _mesa_tex_target_to_face(target);
  80
  81    assert(psv->texture == stObj->pt);
  82 #if 0
  83    assert(target != GL_TEXTURE_3D); /* implemented but untested */
  84 #endif
  85
  86    /* check if we can render in the texture's format */
  87    /* XXX should probably kill this and always use util_gen_mipmap
  88       since this implements a sw fallback as well */
  89    if (!screen->is_format_supported(screen, psv->format, psv->texture->target,
  90                                     0, PIPE_BIND_RENDER_TARGET)) {
  91       return FALSE;
  92    }
  93
  94    /* Disable conditional rendering. */
  95    if (st->render_condition) {
  96       pipe->render_condition(pipe, NULL, 0);
  97    }
  98
  99    util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,
 100                    PIPE_TEX_FILTER_LINEAR);
 101
 102    if (st->render_condition) {
 103       pipe->render_condition(pipe, st->render_condition, st->condition_mode);
 104    }
 105
 106    return TRUE;
 107 }
 108
 109 /**
 110  * Compute the expected number of mipmap levels in the texture given
 111  * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
 112  * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
 113  * levels should be generated.
 114  */
 115 static GLuint
 116 compute_num_levels(struct gl_context *ctx,
 117                    struct gl_texture_object *texObj,
 118                    GLenum target)
 119 {
 120    if (target == GL_TEXTURE_RECTANGLE_ARB) {
 121       return 1;
 122    }
 123    else {
 124       const struct gl_texture_image *baseImage =
 125          _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
 126       GLuint size, numLevels;
 127
 128       size = MAX2(baseImage->Width2, baseImage->Height2);
 129       size = MAX2(size, baseImage->Depth2);
 130
 131       numLevels = texObj->BaseLevel;
 132
 133       while (size > 0) {
 134          numLevels++;
 135          size >>= 1;
 136       }
 137
 138       numLevels = MIN2(numLevels, texObj->MaxLevel + 1);
 139
 140       assert(numLevels >= 1);
 141
 142       return numLevels;
 143    }
 144 }
 145
 146
 147 /**
 148  * Called via ctx->Driver.GenerateMipmap().
 149  */
 150 void
 151 st_generate_mipmap(struct gl_context *ctx, GLenum target,
 152                    struct gl_texture_object *texObj)
 153 {
 154    struct st_context *st = st_context(ctx);
 155    struct st_texture_object *stObj = st_texture_object(texObj);
 156    struct pipe_resource *pt = st_get_texobj_resource(texObj);
 157    const uint baseLevel = texObj->BaseLevel;
 158    uint lastLevel;
 159    uint dstLevel;
 160
 161    if (!pt)
 162       return;
 163
 164    /* not sure if this ultimately actually should work,
 165       but we're not supporting multisampled textures yet. */
 166    assert(pt->nr_samples < 2);
 167
 168    /* find expected last mipmap level to generate*/
 169    lastLevel = compute_num_levels(ctx, texObj, target) - 1;
 170
 171    if (lastLevel == 0)
 172       return;
 173
 174    /* The texture isn't in a "complete" state yet so set the expected
 175     * lastLevel here, since it won't get done in st_finalize_texture().
 176     */
 177    stObj->lastLevel = lastLevel;
 178
 179    if (pt->last_level < lastLevel) {
 180       /* The current gallium texture doesn't have space for all the
 181        * mipmap levels we need to generate.  So allocate a new texture.
 182        */
 183       struct pipe_resource *oldTex = stObj->pt;
 184
 185       /* create new texture with space for more levels */
 186       stObj->pt = st_texture_create(st,
 187                                     oldTex->target,
 188                                     oldTex->format,
 189                                     lastLevel,
 190                                     oldTex->width0,
 191                                     oldTex->height0,
 192                                     oldTex->depth0,
 193                                     oldTex->array_size,
 194                                     oldTex->bind);
 195
 196       /* This will copy the old texture's base image into the new texture
 197        * which we just allocated.
 198        */
 199       st_finalize_texture(ctx, st->pipe, texObj);
 200
 201       /* release the old tex (will likely be freed too) */
 202       pipe_resource_reference(&oldTex, NULL);
 203       pipe_sampler_view_reference(&stObj->sampler_view, NULL);
 204    }
 205    else {
 206       /* Make sure that the base texture image data is present in the
 207        * texture buffer.
 208        */
 209       st_finalize_texture(ctx, st->pipe, texObj);
 210    }
 211
 212    pt = stObj->pt;
 213
 214    assert(pt->last_level >= lastLevel);
 215
 216    /* Try to generate the mipmap by rendering/texturing.  If that fails,
 217     * use the software fallback.
 218     */
 219    if (!st_render_mipmap(st, target, stObj, baseLevel, lastLevel)) {
 220       /* since the util code actually also has a fallback, should
 221          probably make it never fail and kill this */
 222       _mesa_generate_mipmap(ctx, target, texObj);
 223    }
 224
 225    /* Fill in the Mesa gl_texture_image fields */
 226    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
 227       const uint srcLevel = dstLevel - 1;
 228       const struct gl_texture_image *srcImage
 229          = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
 230       struct gl_texture_image *dstImage;
 231       struct st_texture_image *stImage;
 232       uint dstWidth = u_minify(pt->width0, dstLevel);
 233       uint dstHeight = u_minify(pt->height0, dstLevel);
 234       uint dstDepth = u_minify(pt->depth0, dstLevel);
 235       uint border = srcImage->Border;
 236
 237       dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
 238       if (!dstImage) {
 239          _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
 240          return;
 241       }
 242
 243       /* Free old image data */
 244       ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
 245
 246       /* initialize new image */
 247       _mesa_init_teximage_fields(ctx, dstImage, dstWidth, dstHeight,
 248                                  dstDepth, border, srcImage->InternalFormat,
 249                                  srcImage->TexFormat);
 250
 251       stImage = st_texture_image(dstImage);
 252
 253       pipe_resource_reference(&stImage->pt, pt);
 254    }
 255 }