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/*
* Copyright 2009 VMware, Inc.
* 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
* on 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
* VMWARE AND/OR THEIR 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.
*/
#ifndef U_INDICES_H
#define U_INDICES_H
#include "pipe/p_compiler.h"
#include "pipe/p_defines.h"
/* First/last provoking vertex */
#define PV_FIRST 0
#define PV_LAST 1
#define PV_COUNT 2
/* primitive restart disable/enable flags */
#define PR_DISABLE 0
#define PR_ENABLE 1
#define PR_COUNT 2
/**
* Index translator function (for glDrawElements() case)
*
* \param in the input index buffer
* \param start the index of the first vertex (pipe_draw_info::start)
* \param nr the number of vertices (pipe_draw_info::count)
* \param out output buffer big enough for nr vertices (of
* @out_index_size bytes each)
*/
typedef void (*u_translate_func)( const void *in,
unsigned start,
unsigned in_nr,
unsigned out_nr,
unsigned restart_index,
void *out );
/**
* Index generator function (for glDrawArrays() case)
*
* \param start the index of the first vertex (pipe_draw_info::start)
* \param nr the number of vertices (pipe_draw_info::count)
* \param out output buffer big enough for nr vertices (of
* @out_index_size bytes each)
*/
typedef void (*u_generate_func)( unsigned start,
unsigned nr,
void *out );
/* Return codes describe the translate/generate operation. Caller may
* be able to reuse translated indices under some circumstances.
*/
enum indices_mode {
U_TRANSLATE_ERROR = -1,
U_TRANSLATE_NORMAL = 1,
U_TRANSLATE_MEMCPY = 2,
U_GENERATE_LINEAR = 3,
U_GENERATE_REUSABLE= 4,
U_GENERATE_ONE_OFF = 5,
};
void u_index_init( void );
/**
* For indexed drawing, this function determines what kind of primitive
* transformation is needed (if any) for handling:
* - unsupported primitive types (such as PIPE_PRIM_POLYGON)
* - changing the provoking vertex
* - primitive restart
* - index size (1 byte, 2 byte or 4 byte indexes)
*/
enum indices_mode
u_index_translator(unsigned hw_mask,
enum pipe_prim_type prim,
unsigned in_index_size,
unsigned nr,
unsigned in_pv, /* API */
unsigned out_pv, /* hardware */
unsigned prim_restart,
enum pipe_prim_type *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_translate_func *out_translate);
/**
* For non-indexed drawing, this function determines what kind of primitive
* transformation is needed (see above).
*
* Note that even when generating it is necessary to know what the
* API's PV is, as the indices generated will depend on whether it is
* the same as hardware or not, and in the case of triangle strips,
* whether it is first or last.
*/
enum indices_mode
u_index_generator(unsigned hw_mask,
enum pipe_prim_type prim,
unsigned start,
unsigned nr,
unsigned in_pv, /* API */
unsigned out_pv, /* hardware */
enum pipe_prim_type *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_generate_func *out_generate);
void u_unfilled_init( void );
/**
* If the driver can't handle "unfilled" primitives (i.e. drawing triangle
* primitives as 3 lines or 3 points) this function can be used to translate
* an indexed primitive into a new indexed primitive to draw as lines or
* points.
*/
enum indices_mode
u_unfilled_translator(enum pipe_prim_type prim,
unsigned in_index_size,
unsigned nr,
unsigned unfilled_mode,
enum pipe_prim_type *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_translate_func *out_translate);
/**
* As above, but for non-indexed (array) primitives.
*/
enum indices_mode
u_unfilled_generator(enum pipe_prim_type prim,
unsigned start,
unsigned nr,
unsigned unfilled_mode,
enum pipe_prim_type *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_generate_func *out_generate);
#endif
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