0,0 → 1,100 |
/************************************************************************** |
* |
* 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 if needed. |
* Gallium drivers use the convention Y=0=top for surfaces. |
*/ |
if (st_fb_orientation(fb) == Y_0_TOP) { |
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 */ |
}; |