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/**************************************************************************
*
* Copyright 2007 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.
*
**************************************************************************/
/**
* Post-transform vertex format info. The vertex_info struct is used by
* the draw_vbuf code to emit hardware-specific vertex layouts into hw
* vertex buffers.
*
* Author:
* Brian Paul
*/
#ifndef DRAW_VERTEX_H
#define DRAW_VERTEX_H
#include "pipe/p_compiler.h"
#include "pipe/p_state.h"
#include "util/u_debug.h"
/**
* Vertex attribute emit modes
*/
enum attrib_emit {
EMIT_OMIT, /**< don't emit the attribute */
EMIT_1F,
EMIT_1F_PSIZE, /**< insert constant point size */
EMIT_2F,
EMIT_3F,
EMIT_4F,
EMIT_4UB /**< XXX may need variations for RGBA vs BGRA, etc */
};
/**
* Attribute interpolation mode
*/
enum interp_mode {
INTERP_NONE, /**< never interpolate vertex header info */
INTERP_POS, /**< special case for frag position */
INTERP_CONSTANT,
INTERP_LINEAR,
INTERP_PERSPECTIVE
};
/**
* Information about hardware/rasterization vertex layout.
*/
struct vertex_info
{
uint num_attribs;
uint hwfmt[4]; /**< hardware format info for this format */
uint size; /**< total vertex size in dwords */
/* Keep this small and at the end of the struct to allow quick
* memcmp() comparisons.
*/
struct {
unsigned interp_mode:4; /**< INTERP_x */
unsigned emit:4; /**< EMIT_x */
unsigned src_index:8; /**< map to post-xform attribs */
} attrib[PIPE_MAX_SHADER_INPUTS];
};
static INLINE size_t
draw_vinfo_size( const struct vertex_info *a )
{
return offsetof(const struct vertex_info, attrib[a->num_attribs]);
}
static INLINE int
draw_vinfo_compare( const struct vertex_info *a,
const struct vertex_info *b )
{
size_t sizea = draw_vinfo_size( a );
return memcmp( a, b, sizea );
}
static INLINE void
draw_vinfo_copy( struct vertex_info *dst,
const struct vertex_info *src )
{
size_t size = draw_vinfo_size( src );
memcpy( dst, src, size );
}
/**
* Add another attribute to the given vertex_info object.
* \param src_index indicates which post-transformed vertex attrib slot
* corresponds to this attribute.
* \return slot in which the attribute was added
*/
static INLINE uint
draw_emit_vertex_attr(struct vertex_info *vinfo,
enum attrib_emit emit,
enum interp_mode interp, /* only used by softpipe??? */
uint src_index)
{
const uint n = vinfo->num_attribs;
assert(n < PIPE_MAX_SHADER_INPUTS);
vinfo->attrib[n].emit = emit;
vinfo->attrib[n].interp_mode = interp;
vinfo->attrib[n].src_index = src_index;
vinfo->num_attribs++;
return n;
}
extern void draw_compute_vertex_size(struct vertex_info *vinfo);
void draw_dump_emitted_vertex(const struct vertex_info *vinfo,
const uint8_t *data);
static INLINE unsigned draw_translate_vinfo_format(enum attrib_emit emit)
{
switch (emit) {
case EMIT_OMIT:
return PIPE_FORMAT_NONE;
case EMIT_1F:
case EMIT_1F_PSIZE:
return PIPE_FORMAT_R32_FLOAT;
case EMIT_2F:
return PIPE_FORMAT_R32G32_FLOAT;
case EMIT_3F:
return PIPE_FORMAT_R32G32B32_FLOAT;
case EMIT_4F:
return PIPE_FORMAT_R32G32B32A32_FLOAT;
case EMIT_4UB:
return PIPE_FORMAT_R8G8B8A8_UNORM;
default:
assert(!"unexpected format");
return PIPE_FORMAT_NONE;
}
}
static INLINE unsigned draw_translate_vinfo_size(enum attrib_emit emit)
{
switch (emit) {
case EMIT_OMIT:
return 0;
case EMIT_1F:
case EMIT_1F_PSIZE:
return 1 * sizeof(float);
case EMIT_2F:
return 2 * sizeof(float);
case EMIT_3F:
return 3 * sizeof(float);
case EMIT_4F:
return 4 * sizeof(float);
case EMIT_4UB:
return 4 * sizeof(unsigned char);
default:
assert(!"unexpected format");
return 0;
}
}
#endif /* DRAW_VERTEX_H */
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