| /************************************************************************** |
| * |
| * 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 <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]; |
| } |
| } |
| |
| |
| |
| 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 */ |
| }; |