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/**************************************************************************
*
* Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
* Constant State Object (CSO) cache.
*
* The basic idea is that the states are created via the
* create_state/bind_state/delete_state semantics. The driver is expected to
* perform as much of the Gallium state translation to whatever its internal
* representation is during the create call. Gallium then has a caching
* mechanism where it stores the created states. When the pipeline needs an
* actual state change, a bind call is issued. In the bind call the driver
* gets its already translated representation.
*
* Those semantics mean that the driver doesn't do the repeated translations
* of states on every frame, but only once, when a new state is actually
* created.
*
* Even on hardware that doesn't do any kind of state cache, it makes the
* driver look a lot neater, plus it avoids all the redundant state
* translations on every frame.
*
* Currently our constant state objects are:
* - alpha test
* - blend
* - depth stencil
* - fragment shader
* - rasterizer (old setup)
* - sampler
* - vertex shader
*
* Things that are not constant state objects include:
* - blend_color
* - clip_state
* - clear_color_state
* - constant_buffer
* - feedback_state
* - framebuffer_state
* - polygon_stipple
* - scissor_state
* - texture_state
* - viewport_state
*
* @author Zack Rusin <zack@tungstengraphics.com>
*/
#ifndef CSO_CACHE_H
#define CSO_CACHE_H
#include "pipe/p_context.h"
#include "pipe/p_state.h"
/* cso_hash.h is necessary for cso_hash_iter, as MSVC requires structures
* returned by value to be fully defined */
#include "cso_hash.h"
#ifdef __cplusplus
extern "C" {
#endif
struct cso_cache;
struct cso_blend {
struct pipe_blend_state state;
void *data;
void (*delete_state)(void *, void *);
void *context;
};
struct cso_depth_stencil_alpha {
struct pipe_depth_stencil_alpha_state state;
void *data;
void (*delete_state)(void *, void *);
void *context;
};
struct cso_rasterizer {
struct pipe_rasterizer_state state;
void *data;
void (*delete_state)(void *, void *);
void *context;
};
struct cso_fragment_shader {
struct pipe_shader_state state;
void *data;
void (*delete_state)(void *, void *);
void *context;
};
struct cso_vertex_shader {
struct pipe_shader_state state;
void *data;
void (*delete_state)(void *, void *);
void *context;
};
struct cso_sampler {
struct pipe_sampler_state state;
void *data;
void (*delete_state)(void *, void *);
void *context;
};
enum cso_cache_type {
CSO_BLEND,
CSO_SAMPLER,
CSO_DEPTH_STENCIL_ALPHA,
CSO_RASTERIZER,
CSO_FRAGMENT_SHADER,
CSO_VERTEX_SHADER
};
unsigned cso_construct_key(void *item, int item_size);
struct cso_cache *cso_cache_create(void);
void cso_cache_delete(struct cso_cache *sc);
struct cso_hash_iter cso_insert_state(struct cso_cache *sc,
unsigned hash_key, enum cso_cache_type type,
void *state);
struct cso_hash_iter cso_find_state(struct cso_cache *sc,
unsigned hash_key, enum cso_cache_type type);
struct cso_hash_iter cso_find_state_template(struct cso_cache *sc,
unsigned hash_key, enum cso_cache_type type,
void *templ);
void cso_for_each_state(struct cso_cache *sc, enum cso_cache_type type,
void (*func)(void *state, void *user_data), void *user_data);
void * cso_take_state(struct cso_cache *sc, unsigned hash_key,
enum cso_cache_type type);
void cso_set_maximum_cache_size(struct cso_cache *sc, int number);
int cso_maximum_cache_size(const struct cso_cache *sc);
#ifdef __cplusplus
}
#endif
#endif
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