mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-20 05:42:34 +03:00
262 lines
7.0 KiB
C
262 lines
7.0 KiB
C
/**************************************************************************
|
|
*
|
|
* 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>
|
|
*/
|
|
|
|
/* Implement line stipple by cutting lines up into smaller lines.
|
|
* There are hundreds of ways to implement line stipple, this is one
|
|
* choice that should work in all situations, requires no state
|
|
* manipulations, but with a penalty in terms of large amounts of
|
|
* generated geometry.
|
|
*/
|
|
|
|
|
|
#include "pipe/p_defines.h"
|
|
#include "pipe/p_shader_tokens.h"
|
|
#include "util/u_math.h"
|
|
#include "util/u_memory.h"
|
|
|
|
#include "draw/draw_pipe.h"
|
|
|
|
|
|
/** Subclass of draw_stage */
|
|
struct stipple_stage {
|
|
struct draw_stage stage;
|
|
float counter;
|
|
uint pattern;
|
|
uint factor;
|
|
};
|
|
|
|
|
|
static INLINE struct stipple_stage *
|
|
stipple_stage(struct draw_stage *stage)
|
|
{
|
|
return (struct stipple_stage *) stage;
|
|
}
|
|
|
|
|
|
/**
|
|
* Compute interpolated vertex attributes for 'dst' at position 't'
|
|
* between 'v0' and 'v1'.
|
|
* XXX using linear interpolation for all attribs at this time.
|
|
*/
|
|
static void
|
|
screen_interp( struct draw_context *draw,
|
|
struct vertex_header *dst,
|
|
float t,
|
|
const struct vertex_header *v0,
|
|
const struct vertex_header *v1 )
|
|
{
|
|
uint attr;
|
|
uint num_outputs = draw_current_shader_outputs(draw);
|
|
for (attr = 0; attr < num_outputs; attr++) {
|
|
const float *val0 = v0->data[attr];
|
|
const float *val1 = v1->data[attr];
|
|
float *newv = dst->data[attr];
|
|
uint i;
|
|
for (i = 0; i < 4; i++) {
|
|
newv[i] = val0[i] + t * (val1[i] - val0[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
emit_segment(struct draw_stage *stage, struct prim_header *header,
|
|
float t0, float t1)
|
|
{
|
|
struct vertex_header *v0new = dup_vert(stage, header->v[0], 0);
|
|
struct vertex_header *v1new = dup_vert(stage, header->v[1], 1);
|
|
struct prim_header newprim = *header;
|
|
|
|
if (t0 > 0.0) {
|
|
screen_interp( stage->draw, v0new, t0, header->v[0], header->v[1] );
|
|
newprim.v[0] = v0new;
|
|
}
|
|
|
|
if (t1 < 1.0) {
|
|
screen_interp( stage->draw, v1new, t1, header->v[0], header->v[1] );
|
|
newprim.v[1] = v1new;
|
|
}
|
|
|
|
stage->next->line( stage->next, &newprim );
|
|
}
|
|
|
|
|
|
static INLINE unsigned
|
|
stipple_test(int counter, ushort pattern, int factor)
|
|
{
|
|
int b = (counter / factor) & 0xf;
|
|
return (1 << b) & pattern;
|
|
}
|
|
|
|
|
|
static void
|
|
stipple_line(struct draw_stage *stage, struct prim_header *header)
|
|
{
|
|
struct stipple_stage *stipple = stipple_stage(stage);
|
|
struct vertex_header *v0 = header->v[0];
|
|
struct vertex_header *v1 = header->v[1];
|
|
const unsigned pos = draw_current_shader_position_output(stage->draw);
|
|
const float *pos0 = v0->data[pos];
|
|
const float *pos1 = v1->data[pos];
|
|
float start = 0;
|
|
int state = 0;
|
|
|
|
float x0 = pos0[0];
|
|
float x1 = pos1[0];
|
|
float y0 = pos0[1];
|
|
float y1 = pos1[1];
|
|
|
|
float dx = x0 > x1 ? x0 - x1 : x1 - x0;
|
|
float dy = y0 > y1 ? y0 - y1 : y1 - y0;
|
|
|
|
float length = MAX2(dx, dy);
|
|
int i;
|
|
|
|
if (header->flags & DRAW_PIPE_RESET_STIPPLE)
|
|
stipple->counter = 0;
|
|
|
|
|
|
/* XXX ToDo: intead of iterating pixel-by-pixel, use a look-up table.
|
|
*/
|
|
for (i = 0; i < length; i++) {
|
|
int result = stipple_test( (int) stipple->counter+i,
|
|
(ushort) stipple->pattern, stipple->factor );
|
|
if (result != state) {
|
|
/* changing from "off" to "on" or vice versa */
|
|
if (state) {
|
|
if (start != i) {
|
|
/* finishing an "on" segment */
|
|
emit_segment( stage, header, start / length, i / length );
|
|
}
|
|
}
|
|
else {
|
|
/* starting an "on" segment */
|
|
start = (float) i;
|
|
}
|
|
state = result;
|
|
}
|
|
}
|
|
|
|
if (state && start < length)
|
|
emit_segment( stage, header, start / length, 1.0 );
|
|
|
|
stipple->counter += length;
|
|
}
|
|
|
|
|
|
static void
|
|
reset_stipple_counter(struct draw_stage *stage)
|
|
{
|
|
struct stipple_stage *stipple = stipple_stage(stage);
|
|
stipple->counter = 0;
|
|
stage->next->reset_stipple_counter( stage->next );
|
|
}
|
|
|
|
static void
|
|
stipple_reset_point(struct draw_stage *stage, struct prim_header *header)
|
|
{
|
|
struct stipple_stage *stipple = stipple_stage(stage);
|
|
stipple->counter = 0;
|
|
stage->next->point(stage->next, header);
|
|
}
|
|
|
|
static void
|
|
stipple_reset_tri(struct draw_stage *stage, struct prim_header *header)
|
|
{
|
|
struct stipple_stage *stipple = stipple_stage(stage);
|
|
stipple->counter = 0;
|
|
stage->next->tri(stage->next, header);
|
|
}
|
|
|
|
|
|
static void
|
|
stipple_first_line(struct draw_stage *stage,
|
|
struct prim_header *header)
|
|
{
|
|
struct stipple_stage *stipple = stipple_stage(stage);
|
|
struct draw_context *draw = stage->draw;
|
|
|
|
stipple->pattern = draw->rasterizer->line_stipple_pattern;
|
|
stipple->factor = draw->rasterizer->line_stipple_factor + 1;
|
|
|
|
stage->line = stipple_line;
|
|
stage->line( stage, header );
|
|
}
|
|
|
|
|
|
static void
|
|
stipple_flush(struct draw_stage *stage, unsigned flags)
|
|
{
|
|
stage->line = stipple_first_line;
|
|
stage->next->flush( stage->next, flags );
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
stipple_destroy( struct draw_stage *stage )
|
|
{
|
|
draw_free_temp_verts( stage );
|
|
FREE( stage );
|
|
}
|
|
|
|
|
|
/**
|
|
* Create line stippler stage
|
|
*/
|
|
struct draw_stage *draw_stipple_stage( struct draw_context *draw )
|
|
{
|
|
struct stipple_stage *stipple = CALLOC_STRUCT(stipple_stage);
|
|
if (stipple == NULL)
|
|
goto fail;
|
|
|
|
stipple->stage.draw = draw;
|
|
stipple->stage.name = "stipple";
|
|
stipple->stage.next = NULL;
|
|
stipple->stage.point = stipple_reset_point;
|
|
stipple->stage.line = stipple_first_line;
|
|
stipple->stage.tri = stipple_reset_tri;
|
|
stipple->stage.reset_stipple_counter = reset_stipple_counter;
|
|
stipple->stage.flush = stipple_flush;
|
|
stipple->stage.destroy = stipple_destroy;
|
|
|
|
if (!draw_alloc_temp_verts( &stipple->stage, 2 ))
|
|
goto fail;
|
|
|
|
return &stipple->stage;
|
|
|
|
fail:
|
|
if (stipple)
|
|
stipple->stage.destroy( &stipple->stage );
|
|
|
|
return NULL;
|
|
}
|