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5564 | serge | 1 | /************************************************************************** |
2 | * |
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3 | * Copyright 2007 VMware, Inc. |
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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 VMWARE 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 struct gl_context *ctx = st->ctx; |
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68 | const GLuint sz = sizeof(st->state.poly_stipple); |
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69 | assert(sz == sizeof(ctx->PolygonStipple)); |
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70 | |||
71 | if (memcmp(st->state.poly_stipple, ctx->PolygonStipple, sz)) { |
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72 | /* state has changed */ |
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73 | struct pipe_poly_stipple newStipple; |
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74 | |||
75 | memcpy(st->state.poly_stipple, ctx->PolygonStipple, sz); |
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76 | |||
77 | invert_stipple(newStipple.stipple, ctx->PolygonStipple, |
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78 | ctx->DrawBuffer->Height); |
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79 | |||
80 | st->pipe->set_polygon_stipple(st->pipe, &newStipple); |
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81 | } |
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82 | } |
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83 | |||
84 | |||
85 | /** Update the stipple when the pattern or window height changes */ |
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86 | const struct st_tracked_state st_update_polygon_stipple = { |
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87 | "st_update_polygon_stipple", /* name */ |
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88 | { /* dirty */ |
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89 | (_NEW_POLYGONSTIPPLE | |
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90 | _NEW_BUFFERS), /* mesa */ |
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91 | 0, /* st */ |
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92 | }, |
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93 | update_stipple /* update */ |
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94 | };> |