diff options
Diffstat (limited to 'src/mesa/state_tracker/st_atom_stipple.c')
-rw-r--r-- | src/mesa/state_tracker/st_atom_stipple.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_atom_stipple.c b/src/mesa/state_tracker/st_atom_stipple.c new file mode 100644 index 0000000000..31e124b329 --- /dev/null +++ b/src/mesa/state_tracker/st_atom_stipple.c @@ -0,0 +1,91 @@ +/************************************************************************** + * + * 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. + * + **************************************************************************/ + + /* + * \brief polygon stipple state + * + * Authors: + * Brian Paul + */ + + +#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]; + } +} + + + +static void +update_stipple( struct st_context *st ) +{ + const GLuint sz = sizeof(st->state.poly_stipple); + assert(sz == sizeof(st->ctx->PolygonStipple)); + + if (memcmp(st->state.poly_stipple, st->ctx->PolygonStipple, sz)) { + /* state has changed */ + struct pipe_poly_stipple newStipple; + + memcpy(st->state.poly_stipple, st->ctx->PolygonStipple, sz); + + invert_stipple(newStipple.stipple, st->ctx->PolygonStipple, + st->ctx->DrawBuffer->Height); + + st->pipe->set_polygon_stipple(st->pipe, &newStipple); + } +} + + +/** Update the stipple when the pattern or window height changes */ +const struct st_tracked_state st_update_polygon_stipple = { + "st_update_polygon_stipple", /* name */ + { /* dirty */ + (_NEW_POLYGONSTIPPLE | + _NEW_BUFFERS), /* mesa */ + 0, /* st */ + }, + update_stipple /* update */ +}; |