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/**************************************************************************
*
* 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 (_mesa_is_user_fbo(ctx->DrawBuffer)) {
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);
}
}
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