174 lines
5.9 KiB
C
174 lines
5.9 KiB
C
/*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* VMWARE AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef U_INDICES_H
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#define U_INDICES_H
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#include "pipe/p_compiler.h"
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#include "pipe/p_defines.h"
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/* First/last provoking vertex */
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#define PV_FIRST 0
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#define PV_LAST 1
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#define PV_COUNT 2
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/* primitive restart disable/enable flags */
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#define PR_DISABLE 0
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#define PR_ENABLE 1
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#define PR_COUNT 2
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/**
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* Index translator function (for glDrawElements() case)
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*
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* \param in the input index buffer
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* \param start the index of the first vertex (pipe_draw_info::start)
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* \param nr the number of vertices (pipe_draw_info::count)
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* \param out output buffer big enough for nr vertices (of
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* @out_index_size bytes each)
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*/
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typedef void (*u_translate_func)( const void *in,
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unsigned start,
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unsigned in_nr,
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unsigned out_nr,
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unsigned restart_index,
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void *out );
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/**
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* Index generator function (for glDrawArrays() case)
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*
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* \param start the index of the first vertex (pipe_draw_info::start)
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* \param nr the number of vertices (pipe_draw_info::count)
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* \param out output buffer big enough for nr vertices (of
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* @out_index_size bytes each)
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*/
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typedef void (*u_generate_func)( unsigned start,
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unsigned nr,
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void *out );
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/* Return codes describe the translate/generate operation. Caller may
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* be able to reuse translated indices under some circumstances.
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*/
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enum indices_mode {
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U_TRANSLATE_ERROR = -1,
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U_TRANSLATE_NORMAL = 1,
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U_TRANSLATE_MEMCPY = 2,
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U_GENERATE_LINEAR = 3,
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U_GENERATE_REUSABLE= 4,
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U_GENERATE_ONE_OFF = 5,
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};
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void u_index_init( void );
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/* returns the primitive type resulting from index translation */
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enum pipe_prim_type
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u_index_prim_type_convert(unsigned hw_mask, enum pipe_prim_type prim, bool pv_matches);
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static inline unsigned
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u_index_size_convert(unsigned index_size)
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{
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return (index_size == 4) ? 4 : 2;
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}
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unsigned
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u_index_count_converted_indices(unsigned hw_mask, bool pv_matches, enum pipe_prim_type prim, unsigned nr);
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/**
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* For indexed drawing, this function determines what kind of primitive
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* transformation is needed (if any) for handling:
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* - unsupported primitive types (such as PIPE_PRIM_POLYGON)
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* - changing the provoking vertex
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* - primitive restart
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* - index size (1 byte, 2 byte or 4 byte indexes)
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*/
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enum indices_mode
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u_index_translator(unsigned hw_mask,
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enum pipe_prim_type prim,
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unsigned in_index_size,
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unsigned nr,
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unsigned in_pv, /* API */
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unsigned out_pv, /* hardware */
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unsigned prim_restart,
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enum pipe_prim_type *out_prim,
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unsigned *out_index_size,
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unsigned *out_nr,
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u_translate_func *out_translate);
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/**
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* For non-indexed drawing, this function determines what kind of primitive
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* transformation is needed (see above).
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*
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* Note that even when generating it is necessary to know what the
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* API's PV is, as the indices generated will depend on whether it is
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* the same as hardware or not, and in the case of triangle strips,
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* whether it is first or last.
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*/
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enum indices_mode
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u_index_generator(unsigned hw_mask,
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enum pipe_prim_type prim,
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unsigned start,
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unsigned nr,
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unsigned in_pv, /* API */
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unsigned out_pv, /* hardware */
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enum pipe_prim_type *out_prim,
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unsigned *out_index_size,
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unsigned *out_nr,
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u_generate_func *out_generate);
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void u_unfilled_init( void );
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/**
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* If the driver can't handle "unfilled" primitives (i.e. drawing triangle
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* primitives as 3 lines or 3 points) this function can be used to translate
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* an indexed primitive into a new indexed primitive to draw as lines or
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* points.
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*/
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enum indices_mode
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u_unfilled_translator(enum pipe_prim_type prim,
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unsigned in_index_size,
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unsigned nr,
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unsigned unfilled_mode,
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enum pipe_prim_type *out_prim,
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unsigned *out_index_size,
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unsigned *out_nr,
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u_translate_func *out_translate);
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/**
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* As above, but for non-indexed (array) primitives.
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*/
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enum indices_mode
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u_unfilled_generator(enum pipe_prim_type prim,
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unsigned start,
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unsigned nr,
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unsigned unfilled_mode,
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enum pipe_prim_type *out_prim,
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unsigned *out_index_size,
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unsigned *out_nr,
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u_generate_func *out_generate);
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#endif
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