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/*
* Copyright © 2017 Red Hat
*
* 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, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
#ifndef _U_TRANSFER_HELPER_H
#define _U_TRANSFER_HELPER_H
#include "pipe/p_state.h"
#include "pipe/p_context.h"
#ifdef __cplusplus
extern "C" {
#endif
/* A helper to implement various "lowering" for transfers:
*
* - exposing separate depth and stencil resources as packed depth-stencil
* - fake RGTC support for GLES class hardware which needs it to expose GL3+
* - MSAA resolves
*
* To use this, drivers should:
*
* 1) populate u_transfer_vtbl and plug that into pipe_screen::transfer_helper
* 2) plug the transfer helpers into pipe_screen/pipe_context
*
* To avoid subclassing pipe_resource (and conflicting with threaded_context)
* the vtbl contains setter/getter methods used for fake_rgct & separate_stencil
* to access the internal_format and separate stencil buffer.
*/
struct u_transfer_vtbl {
/* NOTE I am not expecting resource_create_from_handle() or
* resource_create_with_modifiers() paths to be creating any
* resources that need special handling. Otherwise they would
* need to be wrapped too.
*/
struct pipe_resource * (*resource_create)(struct pipe_screen *pscreen,
const struct pipe_resource *templ);
void (*resource_destroy)(struct pipe_screen *pscreen,
struct pipe_resource *prsc);
void *(*transfer_map)(struct pipe_context *pctx,
struct pipe_resource *prsc,
unsigned level,
unsigned usage,
const struct pipe_box *box,
struct pipe_transfer **pptrans);
void (*transfer_flush_region)(struct pipe_context *pctx,
struct pipe_transfer *ptrans,
const struct pipe_box *box);
void (*transfer_unmap)(struct pipe_context *pctx,
struct pipe_transfer *ptrans);
/*
* auxiliary methods to access internal format, stencil:
*/
/**
* Must be implemented if separate stencil or fake_rgtc is used. The
* internal_format is the format the resource was created with. In
* the case of separate stencil or fake_rgtc, prsc->format is set back
* to the gallium-frontend-visible format (e.g. Z32_FLOAT_S8X24_UINT or
* PIPE_FORMAT_{RTGC,LATC}* after the resource is created.
*/
enum pipe_format (*get_internal_format)(struct pipe_resource *prsc);
/**
* Must be implemented if separate stencil is lowered. Used to set/get
* the separate s8 stencil buffer.
*
* These two do not get/put references to the pipe_resource. The
* stencil resource will be destroyed by u_transfer_helper_resource_destroy().
*/
void (*set_stencil)(struct pipe_resource *prsc, struct pipe_resource *stencil);
struct pipe_resource *(*get_stencil)(struct pipe_resource *prsc);
};
struct pipe_resource *u_transfer_helper_resource_create(
struct pipe_screen *pscreen, const struct pipe_resource *templ);
void u_transfer_helper_resource_destroy(struct pipe_screen *pscreen,
struct pipe_resource *prsc);
void *u_transfer_helper_transfer_map(struct pipe_context *pctx,
struct pipe_resource *prsc,
unsigned level,
unsigned usage,
const struct pipe_box *box,
struct pipe_transfer **pptrans);
void u_transfer_helper_transfer_flush_region(struct pipe_context *pctx,
struct pipe_transfer *ptrans,
const struct pipe_box *box);
void u_transfer_helper_transfer_unmap(struct pipe_context *pctx,
struct pipe_transfer *ptrans);
struct u_transfer_helper;
struct u_transfer_helper * u_transfer_helper_create(const struct u_transfer_vtbl *vtbl,
bool separate_z32s8,
bool separate_stencil,
bool fake_rgtc,
bool msaa_map);
void u_transfer_helper_destroy(struct u_transfer_helper *helper);
#ifdef __cplusplus
} // extern "C" {
#endif
#endif /* _U_TRANSFER_HELPER_H */
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