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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.
*
**************************************************************************/
/* Author:
* Brian Paul
* Keith Whitwell
*/
#include "main/context.h"
#include "pipe/p_defines.h"
#include "pipe/p_context.h"
#include "pipe/p_winsys.h"
#include "sp_context.h"
#include "sp_state.h"
#include "pipe/draw/draw_private.h"
#include "pipe/draw/draw_context.h"
#include "pipe/draw/draw_prim.h"
/**
* Stand-in for actual vertex program execution
* XXX this will probably live in a new file, like "sp_vs.c"
* \param draw the drawing context
* \param vbuffer the mapped vertex buffer pointer
* \param elem which element of the vertex buffer to use as input
* \param vOut the output vertex
*/
static void
run_vertex_program(struct draw_context *draw,
const void *vbuffer, unsigned elem,
struct vertex_header *vOut)
{
const float *vIn, *cIn;
const float *scale = draw->viewport.scale;
const float *trans = draw->viewport.translate;
const void *mapped = vbuffer;
/* XXX temporary hack: */
GET_CURRENT_CONTEXT(ctx);
const float *m = ctx->_ModelProjectMatrix.m;
vIn = (const float *) ((const ubyte *) mapped
+ draw->vertex_buffer[0].buffer_offset
+ draw->vertex_element[0].src_offset
+ elem * draw->vertex_buffer[0].pitch);
cIn = (const float *) ((const ubyte *) mapped
+ draw->vertex_buffer[3].buffer_offset
+ draw->vertex_element[3].src_offset
+ elem * draw->vertex_buffer[3].pitch);
{
float x = vIn[0];
float y = vIn[1];
float z = vIn[2];
float w = 1.0;
vOut->clipmask = 0x0;
vOut->edgeflag = 0;
/* MVP */
vOut->clip[0] = m[0] * x + m[4] * y + m[ 8] * z + m[12] * w;
vOut->clip[1] = m[1] * x + m[5] * y + m[ 9] * z + m[13] * w;
vOut->clip[2] = m[2] * x + m[6] * y + m[10] * z + m[14] * w;
vOut->clip[3] = m[3] * x + m[7] * y + m[11] * z + m[15] * w;
/* divide by w */
x = vOut->clip[0] / vOut->clip[3];
y = vOut->clip[1] / vOut->clip[3];
z = vOut->clip[2] / vOut->clip[3];
w = 1.0 / vOut->clip[3];
/* Viewport */
vOut->data[0][0] = scale[0] * x + trans[0];
vOut->data[0][1] = scale[1] * y + trans[1];
vOut->data[0][2] = scale[2] * z + trans[2];
vOut->data[0][3] = w;
/* color */
vOut->data[1][0] = cIn[0];
vOut->data[1][1] = cIn[1];
vOut->data[1][2] = cIn[2];
vOut->data[1][3] = 1.0;
}
}
/**
* Called by the draw module when the vertx cache needs to be flushed.
* This involves running the vertex shader.
*/
static void vs_flush( struct draw_context *draw )
{
unsigned i;
/* We're not really running a vertex shader yet, so flushing the vs
* queue is just a matter of building the vertices and returning.
*/
/* Actually, I'm cheating even more and pre-building them still
* with the mesa/vf module. So it's very easy...
*/
for (i = 0; i < draw->vs.queue_nr; i++) {
/* Would do the following steps here:
*
* 1) Loop over vertex element descriptors, fetch data from each
* to build the pre-tnl vertex. This might require a new struct
* to represent the pre-tnl vertex.
*
* 2) Bundle groups of upto 4 pre-tnl vertices together and pass
* to vertex shader.
*
* 3) Do any necessary unswizzling, make sure vertex headers are
* correctly populated, store resulting post-transformed
* vertices in vcache.
*
* In this version, just do the last step:
*/
const unsigned elt = draw->vs.queue[i].elt;
struct vertex_header *dest = draw->vs.queue[i].dest;
run_vertex_program(draw, draw->mapped_vbuffer, elt, dest);
}
draw->vs.queue_nr = 0;
}
void
softpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
unsigned start, unsigned count)
{
struct softpipe_context *sp = softpipe_context(pipe);
struct draw_context *draw = sp->draw;
struct pipe_buffer_handle *buf;
softpipe_map_surfaces(sp);
/*
* Map vertex buffers
*/
buf = sp->vertex_buffer[0].buffer;
draw->mapped_vbuffer
= pipe->winsys->buffer_map(pipe->winsys, buf, PIPE_BUFFER_FLAG_READ);
/* tell drawing pipeline we're beginning drawing */
draw->pipeline.first->begin( draw->pipeline.first );
draw->vs_flush = vs_flush;
draw_invalidate_vcache( draw );
draw_set_element_buffer(draw, 0, NULL); /* no index/element buffer */
draw_set_prim( draw, mode );
/* XXX draw_prim_info() and TRIM here */
draw_prim(draw, start, count);
/* draw any left-over buffered prims */
draw_flush(draw);
/* tell drawing pipeline we're done drawing */
draw->pipeline.first->end( draw->pipeline.first );
/*
* unmap vertex buffer
*/
pipe->winsys->buffer_unmap(pipe->winsys, buf);
softpipe_unmap_surfaces(sp);
}
#define EMIT_ATTR( VF_ATTR, STYLE, SIZE ) \
do { \
if (draw->nr_attrs >= 2) \
draw->vf_attr_to_slot[VF_ATTR] = draw->nr_attrs - 2; \
draw->attrs[draw->nr_attrs].attrib = VF_ATTR; \
draw->attrs[draw->nr_attrs].format = STYLE; \
draw->nr_attrs++; \
draw->vertex_size += SIZE; \
} while (0)
/**
* XXX very similar to same func in draw_vb.c (which will go away)
*/
void
draw_set_vertex_attributes2( struct draw_context *draw,
const unsigned *slot_to_vf_attr,
unsigned nr_attrs )
{
unsigned i;
memset(draw->vf_attr_to_slot, 0, sizeof(draw->vf_attr_to_slot));
draw->nr_attrs = 0;
draw->vertex_size = 0;
/*
* First three attribs are always the same: header, clip pos, winpos
*/
EMIT_ATTR(VF_ATTRIB_VERTEX_HEADER, EMIT_1F, 1);
EMIT_ATTR(VF_ATTRIB_CLIP_POS, EMIT_4F, 4);
assert(slot_to_vf_attr[0] == VF_ATTRIB_POS);
EMIT_ATTR(slot_to_vf_attr[0], EMIT_4F_VIEWPORT, 4);
/*
* Remaining attribs (color, texcoords, etc)
*/
for (i = 1; i < nr_attrs; i++)
EMIT_ATTR(slot_to_vf_attr[i], EMIT_4F, 4);
draw->vertex_size *= 4; /* floats to bytes */
}
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