src/gallium/drivers/svga/svga_sampler_view.h

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
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  25
  26 #ifndef SVGA_SAMPLER_VIEW_H
  27 #define SVGA_SAMPLER_VIEW_H
  28
  29
  30 #include "pipe/p_compiler.h"
  31 #include "pipe/p_state.h"
  32 #include "util/u_inlines.h"
  33 #include "svga_screen_cache.h"
  34
  35 struct pipe_context;
  36 struct pipe_screen;
  37 struct svga_context;
  38 struct svga_pipe_sampler_view;
  39 struct svga_winsys_surface;
  40 struct svga_surface;
  41 enum SVGA3dSurfaceFormat;
  42
  43
  44 /**
  45  * A sampler's view into a texture
  46  *
  47  * We currently cache one sampler view on
  48  * the texture and in there by holding a reference
  49  * from the texture to the sampler view.
  50  *
  51  * Because of this we can not hold a refernce to the
  52  * texture from the sampler view. So the user
  53  * of the sampler views must make sure that the
  54  * texture has a reference take for as long as
  55  * the sampler view is refrenced.
  56  *
  57  * Just unreferencing the sampler_view before the
  58  * texture is enough.
  59  */
  60 struct svga_sampler_view
  61 {
  62    struct pipe_reference reference;
  63
  64    struct pipe_resource *texture;
  65
  66    int min_lod;
  67    int max_lod;
  68
  69    unsigned age;
  70
  71    struct svga_host_surface_cache_key key;
  72    struct svga_winsys_surface *handle;
  73 };
  74
  75
  76
  77 extern struct svga_sampler_view *
  78 svga_get_tex_sampler_view(struct pipe_context *pipe,
  79                           struct pipe_resource *pt,
  80                           unsigned min_lod, unsigned max_lod);
  81
  82 void
  83 svga_validate_sampler_view(struct svga_context *svga, struct svga_sampler_view *v);
  84
  85 void
  86 svga_destroy_sampler_view_priv(struct svga_sampler_view *v);
  87
  88 void
  89 svga_debug_describe_sampler_view(char *buf, const struct svga_sampler_view *sv);
  90
  91 static inline void
  92 svga_sampler_view_reference(struct svga_sampler_view **ptr, struct svga_sampler_view *v)
  93 {
  94    struct svga_sampler_view *old = *ptr;
  95
  96    if (pipe_reference_described(&(*ptr)->reference, &v->reference,
  97                                 (debug_reference_descriptor)svga_debug_describe_sampler_view))
  98       svga_destroy_sampler_view_priv(old);
  99    *ptr = v;
 100 }
 101
 102 boolean
 103 svga_check_sampler_view_resource_collision(const struct svga_context *svga,
 104                                            const struct svga_winsys_surface *res,
 105                                            enum pipe_shader_type shader);
 106
 107 boolean
 108 svga_check_sampler_framebuffer_resource_collision(struct svga_context *svga,
 109                                                   enum pipe_shader_type shader);
 110
 111 enum pipe_error
 112 svga_validate_pipe_sampler_view(struct svga_context *svga,
 113                                 struct svga_pipe_sampler_view *sv);
 114
 115 #endif