src/mesa/state_tracker/st_gen_mipmap.c

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   3  * Copyright 2008 VMware, Inc.
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  16  * of the Software.
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  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;
  79    const uint face = _mesa_tex_target_to_face(target);
  80
  81 #if 0
  82    assert(target != GL_TEXTURE_3D); /* implemented but untested */
  83 #endif
  84
  85    /* check if we can render in the texture's format */
  86    /* XXX should probably kill this and always use util_gen_mipmap
  87       since this implements a sw fallback as well */
  88    if (!screen->is_format_supported(screen, stObj->pt->format,
  89                                     stObj->pt->target,
  90                                     0, PIPE_BIND_RENDER_TARGET)) {
  91       return FALSE;
  92    }
  93
  94    psv = st_create_texture_sampler_view(pipe, stObj->pt);
  95
  96    util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,
  97                    PIPE_TEX_FILTER_LINEAR);
  98
  99    pipe_sampler_view_reference(&psv, NULL);
 100
 101    return TRUE;
 102 }
 103
 104 /**
 105  * Compute the expected number of mipmap levels in the texture given
 106  * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
 107  * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
 108  * levels should be generated.
 109  */
 110 static GLuint
 111 compute_num_levels(struct gl_context *ctx,
 112                    struct gl_texture_object *texObj,
 113                    GLenum target)
 114 {
 115    const struct gl_texture_image *baseImage;
 116    GLuint numLevels;
 117
 118    baseImage = _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
 119
 120    numLevels = texObj->BaseLevel + baseImage->MaxNumLevels;
 121    numLevels = MIN2(numLevels, (GLuint) texObj->MaxLevel + 1);
 122    assert(numLevels >= 1);
 123
 124    return numLevels;
 125 }
 126
 127
 128 /**
 129  * Called via ctx->Driver.GenerateMipmap().
 130  */
 131 void
 132 st_generate_mipmap(struct gl_context *ctx, GLenum target,
 133                    struct gl_texture_object *texObj)
 134 {
 135    struct st_context *st = st_context(ctx);
 136    struct st_texture_object *stObj = st_texture_object(texObj);
 137    struct pipe_resource *pt = st_get_texobj_resource(texObj);
 138    const uint baseLevel = texObj->BaseLevel;
 139    uint lastLevel;
 140    uint dstLevel;
 141
 142    if (!pt)
 143       return;
 144
 145    /* not sure if this ultimately actually should work,
 146       but we're not supporting multisampled textures yet. */
 147    assert(pt->nr_samples < 2);
 148
 149    /* find expected last mipmap level to generate*/
 150    lastLevel = compute_num_levels(ctx, texObj, target) - 1;
 151
 152    if (lastLevel == 0)
 153       return;
 154
 155    /* The texture isn't in a "complete" state yet so set the expected
 156     * lastLevel here, since it won't get done in st_finalize_texture().
 157     */
 158    stObj->lastLevel = lastLevel;
 159
 160    if (pt->last_level < lastLevel) {
 161       /* The current gallium texture doesn't have space for all the
 162        * mipmap levels we need to generate.  So allocate a new texture.
 163        */
 164       struct pipe_resource *oldTex = stObj->pt;
 165
 166       /* create new texture with space for more levels */
 167       stObj->pt = st_texture_create(st,
 168                                     oldTex->target,
 169                                     oldTex->format,
 170                                     lastLevel,
 171                                     oldTex->width0,
 172                                     oldTex->height0,
 173                                     oldTex->depth0,
 174                                     oldTex->array_size,
 175                                     0,
 176                                     oldTex->bind);
 177
 178       /* This will copy the old texture's base image into the new texture
 179        * which we just allocated.
 180        */
 181       st_finalize_texture(ctx, st->pipe, texObj);
 182
 183       /* release the old tex (will likely be freed too) */
 184       pipe_resource_reference(&oldTex, NULL);
 185       pipe_sampler_view_reference(&stObj->sampler_view, NULL);
 186    }
 187    else {
 188       /* Make sure that the base texture image data is present in the
 189        * texture buffer.
 190        */
 191       st_finalize_texture(ctx, st->pipe, texObj);
 192    }
 193
 194    pt = stObj->pt;
 195
 196    assert(pt->last_level >= lastLevel);
 197
 198    /* Try to generate the mipmap by rendering/texturing.  If that fails,
 199     * use the software fallback.
 200     */
 201    if (!st_render_mipmap(st, target, stObj, baseLevel, lastLevel)) {
 202       /* since the util code actually also has a fallback, should
 203          probably make it never fail and kill this */
 204       _mesa_generate_mipmap(ctx, target, texObj);
 205    }
 206
 207    /* Fill in the Mesa gl_texture_image fields */
 208    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
 209       const uint srcLevel = dstLevel - 1;
 210       const struct gl_texture_image *srcImage
 211          = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
 212       struct gl_texture_image *dstImage;
 213       struct st_texture_image *stImage;
 214       uint border = srcImage->Border;
 215       uint dstWidth, dstHeight, dstDepth;
 216
 217       dstWidth = u_minify(pt->width0, dstLevel);
 218       if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
 219          dstHeight = pt->array_size;
 220       }
 221       else {
 222          dstHeight = u_minify(pt->height0, dstLevel);
 223       }
 224       if (texObj->Target == GL_TEXTURE_2D_ARRAY) {
 225          dstDepth = pt->array_size;
 226       }
 227       else {
 228          dstDepth = u_minify(pt->depth0, dstLevel);
 229       }
 230
 231       dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
 232       if (!dstImage) {
 233          _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
 234          return;
 235       }
 236
 237       /* Free old image data */
 238       ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
 239
 240       /* initialize new image */
 241       _mesa_init_teximage_fields(ctx, dstImage, dstWidth, dstHeight,
 242                                  dstDepth, border, srcImage->InternalFormat,
 243                                  srcImage->TexFormat);
 244
 245       stImage = st_texture_image(dstImage);
 246
 247       pipe_resource_reference(&stImage->pt, pt);
 248    }
 249 }