-/**
- * Given the texture face, level, zslice, x and y values, compute
- * the cache entry position/index where we'd hope to find the
- * cached texture tile.
- * This is basically a direct-map cache.
- * XXX There's probably lots of ways in which we can improve this.
- */
-static INLINE uint
-tex_cache_pos(int x, int y, int z, int face, int level)
-{
- uint entry = x + y * 5 + z * 4 + face + level;
- return entry % NUM_ENTRIES;
-}
-
-
-/**
- * Similar to sp_get_cached_tile() but for textures.
- * Tiles are read-only and indexed with more params.
- */
-const struct softpipe_cached_tile *
-sp_get_cached_tile_tex(struct softpipe_context *sp,
- struct softpipe_tile_cache *tc, int x, int y, int z,
- int face, int level)
-{
- struct pipe_screen *screen = sp->pipe.screen;
- /* tile pos in framebuffer: */
- const int tile_x = x & ~(TILE_SIZE - 1);
- const int tile_y = y & ~(TILE_SIZE - 1);
- /* cache pos/entry: */
- const uint pos = tex_cache_pos(x / TILE_SIZE, y / TILE_SIZE, z,
- face, level);
- struct softpipe_cached_tile *tile = tc->entries + pos;
-
- if (tc->texture) {
- struct softpipe_texture *spt = softpipe_texture(tc->texture);
- if (spt->modified) {
- /* texture was modified, force a cache reload */
- tile->x = -1;
- spt->modified = FALSE;
- }
- }
-
- if (tile_x != tile->x ||
- tile_y != tile->y ||
- z != tile->z ||
- face != tile->face ||
- level != tile->level) {
- /* cache miss */
-
- /* check if we need to get a new surface */
- if (!tc->tex_surf ||
- tc->tex_face != face ||
- tc->tex_level != level ||
- tc->tex_z != z) {
- /* get new surface (view into texture) */
-
- if (tc->tex_surf_map)
- tc->screen->surface_unmap(tc->screen, tc->tex_surf);
-
- tc->tex_surf = screen->get_tex_surface(screen, tc->texture, face, level, z,
- PIPE_BUFFER_USAGE_CPU_READ);
- tc->tex_surf_map = screen->surface_map(screen, tc->tex_surf,
- PIPE_BUFFER_USAGE_CPU_READ);
-
- tc->tex_face = face;
- tc->tex_level = level;
- tc->tex_z = z;
- }