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/**************************************************************************
*
* Copyright 2008 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.
*
**************************************************************************/
#include "util/u_memory.h"
#include "pipe/p_context.h"
#include "draw/draw_context.h"
#include "draw/draw_private.h"
#include "draw/draw_vbuf.h"
#include "draw/draw_vertex.h"
#include "draw/draw_pt.h"
struct pt_post_vs {
struct draw_context *draw;
boolean (*run)( struct pt_post_vs *pvs,
struct vertex_header *vertices,
unsigned count,
unsigned stride );
};
static INLINE float
dot4(const float *a, const float *b)
{
return (a[0]*b[0] +
a[1]*b[1] +
a[2]*b[2] +
a[3]*b[3]);
}
static INLINE unsigned
compute_clipmask_gl(const float *clip, /*const*/ float plane[][4], unsigned nr)
{
unsigned mask = 0x0;
unsigned i;
#if 0
debug_printf("compute clipmask %f %f %f %f\n",
clip[0], clip[1], clip[2], clip[3]);
assert(clip[3] != 0.0);
#endif
/* Do the hardwired planes first:
*/
if (-clip[0] + clip[3] < 0) mask |= (1<<0);
if ( clip[0] + clip[3] < 0) mask |= (1<<1);
if (-clip[1] + clip[3] < 0) mask |= (1<<2);
if ( clip[1] + clip[3] < 0) mask |= (1<<3);
if ( clip[2] + clip[3] < 0) mask |= (1<<4); /* match mesa clipplane numbering - for now */
if (-clip[2] + clip[3] < 0) mask |= (1<<5); /* match mesa clipplane numbering - for now */
/* Followed by any remaining ones:
*/
for (i = 6; i < nr; i++) {
if (dot4(clip, plane[i]) < 0)
mask |= (1<<i);
}
return mask;
}
/* The normal case - cliptest, rhw divide, viewport transform.
*
* Also handle identity viewport here at the expense of a few wasted
* instructions
*/
static boolean post_vs_cliptest_viewport_gl( struct pt_post_vs *pvs,
struct vertex_header *vertices,
unsigned count,
unsigned stride )
{
struct vertex_header *out = vertices;
const float *scale = pvs->draw->viewport.scale;
const float *trans = pvs->draw->viewport.translate;
const unsigned pos = pvs->draw->vs.position_output;
unsigned clipped = 0;
unsigned j;
if (0) debug_printf("%s\n");
for (j = 0; j < count; j++) {
float *position = out->data[pos];
out->clip[0] = position[0];
out->clip[1] = position[1];
out->clip[2] = position[2];
out->clip[3] = position[3];
out->vertex_id = 0xffff;
out->clipmask = compute_clipmask_gl(out->clip,
pvs->draw->plane,
pvs->draw->nr_planes);
clipped += out->clipmask;
if (out->clipmask == 0)
{
/* divide by w */
float w = 1.0f / position[3];
/* Viewport mapping */
position[0] = position[0] * w * scale[0] + trans[0];
position[1] = position[1] * w * scale[1] + trans[1];
position[2] = position[2] * w * scale[2] + trans[2];
position[3] = w;
#if 0
debug_printf("post viewport: %f %f %f %f\n",
position[0],
position[1],
position[2],
position[3]);
#endif
}
out = (struct vertex_header *)( (char *)out + stride );
}
return clipped != 0;
}
/* If bypass_clipping is set, skip cliptest and rhw divide.
*/
static boolean post_vs_viewport( struct pt_post_vs *pvs,
struct vertex_header *vertices,
unsigned count,
unsigned stride )
{
struct vertex_header *out = vertices;
const float *scale = pvs->draw->viewport.scale;
const float *trans = pvs->draw->viewport.translate;
const unsigned pos = pvs->draw->vs.position_output;
unsigned j;
if (0) debug_printf("%s\n", __FUNCTION__);
for (j = 0; j < count; j++) {
float *position = out->data[pos];
/* Viewport mapping only, no cliptest/rhw divide
*/
position[0] = position[0] * scale[0] + trans[0];
position[1] = position[1] * scale[1] + trans[1];
position[2] = position[2] * scale[2] + trans[2];
out = (struct vertex_header *)((char *)out + stride);
}
return FALSE;
}
/* If bypass_clipping is set and we have an identity viewport, nothing
* to do.
*/
static boolean post_vs_none( struct pt_post_vs *pvs,
struct vertex_header *vertices,
unsigned count,
unsigned stride )
{
if (0) debug_printf("%s\n", __FUNCTION__);
return FALSE;
}
boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
struct vertex_header *pipeline_verts,
unsigned count,
unsigned stride )
{
return pvs->run( pvs, pipeline_verts, count, stride );
}
void draw_pt_post_vs_prepare( struct pt_post_vs *pvs,
boolean bypass_clipping,
boolean identity_viewport,
boolean opengl )
{
if (bypass_clipping) {
if (identity_viewport)
pvs->run = post_vs_none;
else
pvs->run = post_vs_viewport;
}
else {
//if (opengl)
pvs->run = post_vs_cliptest_viewport_gl;
}
}
struct pt_post_vs *draw_pt_post_vs_create( struct draw_context *draw )
{
struct pt_post_vs *pvs = CALLOC_STRUCT( pt_post_vs );
if (!pvs)
return NULL;
pvs->draw = draw;
return pvs;
}
void draw_pt_post_vs_destroy( struct pt_post_vs *pvs )
{
FREE(pvs);
}
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