87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright 2007 VMware, Inc.
|
|
* 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 VMWARE 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 polygon stipple state
|
|
*
|
|
* Authors:
|
|
* Brian Paul
|
|
*/
|
|
|
|
|
|
#include <assert.h>
|
|
|
|
#include "st_context.h"
|
|
#include "st_atom.h"
|
|
#include "pipe/p_context.h"
|
|
#include "pipe/p_defines.h"
|
|
|
|
|
|
/**
|
|
* OpenGL's polygon stipple is indexed with window coordinates in which
|
|
* the origin (0,0) is the lower-left corner of the window.
|
|
* With Gallium, the origin is the upper-left corner of the window.
|
|
* To convert GL's polygon stipple to what gallium expects we need to
|
|
* invert the pattern vertically and rotate the stipple rows according
|
|
* to the window height.
|
|
*/
|
|
static void
|
|
invert_stipple(GLuint dest[32], const GLuint src[32], GLuint winHeight)
|
|
{
|
|
GLuint i;
|
|
|
|
for (i = 0; i < 32; i++) {
|
|
dest[i] = src[(winHeight - 1 - i) & 0x1f];
|
|
}
|
|
}
|
|
|
|
|
|
/** Update the stipple when the pattern or window height changes */
|
|
void
|
|
st_update_polygon_stipple( struct st_context *st )
|
|
{
|
|
const struct gl_context *ctx = st->ctx;
|
|
const GLuint sz = sizeof(st->state.poly_stipple);
|
|
assert(sz == sizeof(ctx->PolygonStipple));
|
|
|
|
if (memcmp(st->state.poly_stipple, ctx->PolygonStipple, sz)) {
|
|
/* state has changed */
|
|
struct pipe_poly_stipple newStipple;
|
|
|
|
memcpy(st->state.poly_stipple, ctx->PolygonStipple, sz);
|
|
|
|
if (!ctx->DrawBuffer->FlipY) {
|
|
memcpy(newStipple.stipple, ctx->PolygonStipple, sizeof(newStipple.stipple));
|
|
} else {
|
|
invert_stipple(newStipple.stipple, ctx->PolygonStipple,
|
|
ctx->DrawBuffer->Height);
|
|
}
|
|
|
|
st->pipe->set_polygon_stipple(st->pipe, &newStipple);
|
|
}
|
|
}
|