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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 "main/macros.h"
#include "st_context.h"
#include "pipe/p_context.h"
#include "st_atom.h"
/**
* Scissor depends on the scissor box, and the framebuffer dimensions.
*/
static void
update_scissor( struct st_context *st )
{
struct pipe_scissor_state scissor;
const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
GLint miny, maxy;
scissor.minx = 0;
scissor.miny = 0;
scissor.maxx = fb->Width;
scissor.maxy = fb->Height;
if (st->ctx->Scissor.Enabled) {
/* need to be careful here with xmax or ymax < 0 */
GLint xmax = MAX2(0, st->ctx->Scissor.X + st->ctx->Scissor.Width);
GLint ymax = MAX2(0, st->ctx->Scissor.Y + st->ctx->Scissor.Height);
if (st->ctx->Scissor.X > (GLint)scissor.minx)
scissor.minx = st->ctx->Scissor.X;
if (st->ctx->Scissor.Y > (GLint)scissor.miny)
scissor.miny = st->ctx->Scissor.Y;
if (xmax < (GLint) scissor.maxx)
scissor.maxx = xmax;
if (ymax < (GLint) scissor.maxy)
scissor.maxy = ymax;
/* check for null space */
if (scissor.minx >= scissor.maxx || scissor.miny >= scissor.maxy)
scissor.minx = scissor.miny = scissor.maxx = scissor.maxy = 0;
}
/* Now invert Y. Pipe drivers use the convention Y=0=top for surfaces
*/
miny = fb->Height - scissor.maxy;
maxy = fb->Height - scissor.miny;
scissor.miny = miny;
scissor.maxy = maxy;
if (memcmp(&scissor, &st->state.scissor, sizeof(scissor)) != 0) {
/* state has changed */
st->state.scissor = scissor; /* struct copy */
st->pipe->set_scissor_state(st->pipe, &scissor); /* activate */
}
}
const struct st_tracked_state st_update_scissor = {
"st_update_scissor", /* name */
{ /* dirty */
(_NEW_SCISSOR | _NEW_BUFFERS), /* mesa */
0, /* st */
},
update_scissor /* update */
};
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