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| 1901 | serge | 1 | /************************************************************************** |
| 2 | * |
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| 3 | * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. |
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| 4 | * All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the |
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| 8 | * "Software"), to deal in the Software without restriction, including |
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| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
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| 11 | * permit persons to whom the Software is furnished to do so, subject to |
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| 12 | * the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice (including the |
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| 15 | * next paragraph) shall be included in all copies or substantial portions |
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| 16 | * of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
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| 21 | * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR |
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| 22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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| 23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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| 24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | * |
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| 26 | **************************************************************************/ |
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| 27 | |||
| 28 | /* |
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| 29 | * \brief polygon stipple state |
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| 30 | * |
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| 31 | * Authors: |
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| 32 | * Brian Paul |
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| 33 | */ |
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| 34 | |||
| 35 | |||
| 36 | #include |
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| 37 | |||
| 38 | #include "st_context.h" |
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| 39 | #include "st_atom.h" |
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| 40 | #include "pipe/p_context.h" |
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| 41 | #include "pipe/p_defines.h" |
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| 42 | |||
| 43 | |||
| 44 | /** |
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| 45 | * OpenGL's polygon stipple is indexed with window coordinates in which |
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| 46 | * the origin (0,0) is the lower-left corner of the window. |
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| 47 | * With Gallium, the origin is the upper-left corner of the window. |
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| 48 | * To convert GL's polygon stipple to what gallium expects we need to |
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| 49 | * invert the pattern vertically and rotate the stipple rows according |
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| 50 | * to the window height. |
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| 51 | */ |
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| 52 | static void |
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| 53 | invert_stipple(GLuint dest[32], const GLuint src[32], GLuint winHeight) |
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| 54 | { |
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| 55 | GLuint i; |
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| 56 | |||
| 57 | for (i = 0; i < 32; i++) { |
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| 58 | dest[i] = src[(winHeight - 1 - i) & 0x1f]; |
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| 59 | } |
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| 60 | } |
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| 61 | |||
| 62 | |||
| 63 | |||
| 64 | static void |
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| 65 | update_stipple( struct st_context *st ) |
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| 66 | { |
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| 67 | const GLuint sz = sizeof(st->state.poly_stipple); |
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| 68 | assert(sz == sizeof(st->ctx->PolygonStipple)); |
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| 69 | |||
| 70 | if (memcmp(st->state.poly_stipple, st->ctx->PolygonStipple, sz)) { |
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| 71 | /* state has changed */ |
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| 72 | struct pipe_poly_stipple newStipple; |
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| 73 | |||
| 74 | memcpy(st->state.poly_stipple, st->ctx->PolygonStipple, sz); |
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| 75 | |||
| 76 | invert_stipple(newStipple.stipple, st->ctx->PolygonStipple, |
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| 77 | st->ctx->DrawBuffer->Height); |
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| 78 | |||
| 79 | st->pipe->set_polygon_stipple(st->pipe, &newStipple); |
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| 80 | } |
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| 81 | } |
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| 82 | |||
| 83 | |||
| 84 | /** Update the stipple when the pattern or window height changes */ |
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| 85 | const struct st_tracked_state st_update_polygon_stipple = { |
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| 86 | "st_update_polygon_stipple", /* name */ |
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| 87 | { /* dirty */ |
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| 88 | (_NEW_POLYGONSTIPPLE | |
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| 89 | _NEW_BUFFERS), /* mesa */ |
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| 90 | 0, /* st */ |
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| 91 | }, |
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| 92 | update_stipple /* update */ |
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| 93 | }; |