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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.
*
**************************************************************************/
/* Authors: Keith Whitwell <keith@tungstengraphics.com>
*/
#include "pipe/p_util.h"
#include "pipe/p_defines.h"
#include "draw_private.h"
/**
* Rebuild the rendering pipeline.
*/
static struct draw_stage *validate_pipeline( struct draw_stage *stage )
{
struct draw_context *draw = stage->draw;
struct draw_stage *next = draw->pipeline.rasterize;
int need_det = 0;
int precalc_flat = 0;
boolean wide_lines, wide_points;
/* Set the validate's next stage to the rasterize stage, so that it
* can be found later if needed for flushing.
*/
stage->next = next;
/* drawing wide lines? */
wide_lines = (draw->rasterizer->line_width > draw->wide_line_threshold
&& !draw->rasterizer->line_smooth);
/* drawing large points? */
if (draw->rasterizer->point_smooth && draw->pipeline.aapoint)
wide_points = FALSE;
else if (draw->rasterizer->point_size > draw->wide_point_threshold)
wide_points = TRUE;
else
wide_points = FALSE;
/*
* NOTE: we build up the pipeline in end-to-start order.
*
* TODO: make the current primitive part of the state and build
* shorter pipelines for lines & points.
*/
if (draw->rasterizer->line_smooth && draw->pipeline.aaline) {
draw->pipeline.aaline->next = next;
next = draw->pipeline.aaline;
}
if (draw->rasterizer->point_smooth && draw->pipeline.aapoint) {
draw->pipeline.aapoint->next = next;
next = draw->pipeline.aapoint;
}
if (wide_lines) {
draw->pipeline.wide_line->next = next;
next = draw->pipeline.wide_line;
precalc_flat = 1;
}
if (wide_points || draw->rasterizer->point_sprite) {
draw->pipeline.wide_point->next = next;
next = draw->pipeline.wide_point;
}
if (draw->rasterizer->line_stipple_enable) {
draw->pipeline.stipple->next = next;
next = draw->pipeline.stipple;
precalc_flat = 1; /* only needed for lines really */
}
if (draw->rasterizer->poly_stipple_enable
&& draw->pipeline.pstipple) {
draw->pipeline.pstipple->next = next;
next = draw->pipeline.pstipple;
}
if (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) {
draw->pipeline.unfilled->next = next;
next = draw->pipeline.unfilled;
precalc_flat = 1; /* only needed for triangles really */
need_det = 1;
}
if (draw->rasterizer->flatshade && precalc_flat) {
draw->pipeline.flatshade->next = next;
next = draw->pipeline.flatshade;
}
if (draw->rasterizer->offset_cw ||
draw->rasterizer->offset_ccw) {
draw->pipeline.offset->next = next;
next = draw->pipeline.offset;
need_det = 1;
}
if (draw->rasterizer->light_twoside) {
draw->pipeline.twoside->next = next;
next = draw->pipeline.twoside;
need_det = 1;
}
/* Always run the cull stage as we calculate determinant there
* also.
*
* This can actually be a win as culling out the triangles can lead
* to less work emitting vertices, smaller vertex buffers, etc.
* It's difficult to say whether this will be true in general.
*/
if (need_det || draw->rasterizer->cull_mode) {
draw->pipeline.cull->next = next;
next = draw->pipeline.cull;
}
/* Clip stage
*/
if (!draw->rasterizer->bypass_clipping)
{
draw->pipeline.clip->next = next;
next = draw->pipeline.clip;
}
draw->pipeline.first = next;
return next;
}
static void validate_tri( struct draw_stage *stage,
struct prim_header *header )
{
struct draw_stage *pipeline = validate_pipeline( stage );
pipeline->tri( pipeline, header );
}
static void validate_line( struct draw_stage *stage,
struct prim_header *header )
{
struct draw_stage *pipeline = validate_pipeline( stage );
pipeline->line( pipeline, header );
}
static void validate_point( struct draw_stage *stage,
struct prim_header *header )
{
struct draw_stage *pipeline = validate_pipeline( stage );
pipeline->point( pipeline, header );
}
static void validate_reset_stipple_counter( struct draw_stage *stage )
{
struct draw_stage *pipeline = validate_pipeline( stage );
pipeline->reset_stipple_counter( pipeline );
}
static void validate_flush( struct draw_stage *stage,
unsigned flags )
{
/* May need to pass a backend flush on to the rasterize stage.
*/
if (stage->next)
stage->next->flush( stage->next, flags );
}
static void validate_destroy( struct draw_stage *stage )
{
FREE( stage );
}
/**
* Create validate pipeline stage.
*/
struct draw_stage *draw_validate_stage( struct draw_context *draw )
{
struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
stage->draw = draw;
stage->next = NULL;
stage->point = validate_point;
stage->line = validate_line;
stage->tri = validate_tri;
stage->flush = validate_flush;
stage->reset_stipple_counter = validate_reset_stipple_counter;
stage->destroy = validate_destroy;
return stage;
}
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