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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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keithw@vmware.com>
*/
#include "main/macros.h"
#include "main/framebuffer.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[PIPE_MAX_VIEWPORTS];
const struct gl_context *ctx = st->ctx;
const struct gl_framebuffer *fb = ctx->DrawBuffer;
const unsigned int fb_width = _mesa_geometric_width(fb);
const unsigned int fb_height = _mesa_geometric_height(fb);
GLint miny, maxy;
unsigned i;
bool changed = false;
for (i = 0 ; i < ctx->Const.MaxViewports; i++) {
scissor[i].minx = 0;
scissor[i].miny = 0;
scissor[i].maxx = fb_width;
scissor[i].maxy = fb_height;
if (ctx->Scissor.EnableFlags & (1 << i)) {
/* need to be careful here with xmax or ymax < 0 */
GLint xmax = MAX2(0, ctx->Scissor.ScissorArray[i].X + ctx->Scissor.ScissorArray[i].Width);
GLint ymax = MAX2(0, ctx->Scissor.ScissorArray[i].Y + ctx->Scissor.ScissorArray[i].Height);
if (ctx->Scissor.ScissorArray[i].X > (GLint)scissor[i].minx)
scissor[i].minx = ctx->Scissor.ScissorArray[i].X;
if (ctx->Scissor.ScissorArray[i].Y > (GLint)scissor[i].miny)
scissor[i].miny = ctx->Scissor.ScissorArray[i].Y;
if (xmax < (GLint) scissor[i].maxx)
scissor[i].maxx = xmax;
if (ymax < (GLint) scissor[i].maxy)
scissor[i].maxy = ymax;
/* check for null space */
if (scissor[i].minx >= scissor[i].maxx || scissor[i].miny >= scissor[i].maxy)
scissor[i].minx = scissor[i].miny = scissor[i].maxx = scissor[i].maxy = 0;
}
/* Now invert Y if needed.
* Gallium drivers use the convention Y=0=top for surfaces.
*/
if (st_fb_orientation(fb) == Y_0_TOP) {
miny = fb->Height - scissor[i].maxy;
maxy = fb->Height - scissor[i].miny;
scissor[i].miny = miny;
scissor[i].maxy = maxy;
}
if (memcmp(&scissor[i], &st->state.scissor[i], sizeof(scissor[0])) != 0) {
/* state has changed */
st->state.scissor[i] = scissor[i]; /* struct copy */
changed = true;
}
}
if (changed)
st->pipe->set_scissor_states(st->pipe, 0, ctx->Const.MaxViewports, 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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