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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.
*
**************************************************************************/
/**
* \brief Quad early-z testing
*/
#include "pipe/p_defines.h"
#include "pipe/p_util.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
#include "sp_tile_cache.h"
static void
earlyz_quad(
struct quad_stage *qs,
struct quad_header *quad )
{
uint i;
const float fx = (float) quad->x0;
const float fy = (float) quad->y0;
float xy[4][2];
xy[0][0] = fx;
xy[1][0] = fx + 1.0f;
xy[2][0] = fx;
xy[3][0] = fx + 1.0f;
xy[0][1] = fy;
xy[1][1] = fy;
xy[2][1] = fy + 1.0f;
xy[3][1] = fy + 1.0f;
for (i = 0; i < QUAD_SIZE; i++) {
quad->outputs.depth[i] =
quad->coef[0].a0[2] +
quad->coef[0].dadx[2] * xy[i][0] +
quad->coef[0].dady[2] * xy[i][1];
}
if (qs->next) {
qs->next->run( qs->next, quad );
}
}
static void
earlyz_begin(
struct quad_stage *qs )
{
if (qs->next) {
qs->next->begin( qs->next );
}
}
static void
earlyz_destroy(
struct quad_stage *qs )
{
FREE( qs );
}
struct quad_stage *
sp_quad_earlyz_stage(
struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT( quad_stage );
stage->softpipe = softpipe;
stage->begin = earlyz_begin;
stage->run = earlyz_quad;
stage->destroy = earlyz_destroy;
return stage;
}
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