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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5563 | 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 | * Authors: |
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| 30 | * Keith Whitwell |
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| 31 | */ |
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| 32 | |||
| 33 | |||
| 34 | #include "main/macros.h" |
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| 35 | #include "st_context.h" |
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| 36 | #include "pipe/p_context.h" |
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| 37 | #include "st_atom.h" |
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| 38 | |||
| 39 | |||
| 40 | /** |
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| 41 | * Scissor depends on the scissor box, and the framebuffer dimensions. |
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| 42 | */ |
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| 43 | static void |
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| 44 | update_scissor( struct st_context *st ) |
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| 45 | { |
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| 46 | struct pipe_scissor_state scissor; |
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| 47 | const struct gl_context *ctx = st->ctx; |
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| 48 | const struct gl_framebuffer *fb = ctx->DrawBuffer; |
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| 49 | GLint miny, maxy; |
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| 50 | |||
| 51 | scissor.minx = 0; |
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| 52 | scissor.miny = 0; |
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| 53 | scissor.maxx = fb->Width; |
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| 54 | scissor.maxy = fb->Height; |
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| 55 | |||
| 56 | if (ctx->Scissor.Enabled) { |
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| 57 | /* need to be careful here with xmax or ymax < 0 */ |
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| 58 | GLint xmax = MAX2(0, ctx->Scissor.X + ctx->Scissor.Width); |
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| 59 | GLint ymax = MAX2(0, ctx->Scissor.Y + ctx->Scissor.Height); |
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| 60 | |||
| 61 | if (ctx->Scissor.X > (GLint)scissor.minx) |
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| 62 | scissor.minx = ctx->Scissor.X; |
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| 63 | if (ctx->Scissor.Y > (GLint)scissor.miny) |
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| 64 | scissor.miny = ctx->Scissor.Y; |
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| 65 | |||
| 66 | if (xmax < (GLint) scissor.maxx) |
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| 67 | scissor.maxx = xmax; |
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| 68 | if (ymax < (GLint) scissor.maxy) |
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| 69 | scissor.maxy = ymax; |
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| 70 | |||
| 71 | /* check for null space */ |
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| 72 | if (scissor.minx >= scissor.maxx || scissor.miny >= scissor.maxy) |
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| 73 | scissor.minx = scissor.miny = scissor.maxx = scissor.maxy = 0; |
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| 74 | } |
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| 75 | |||
| 76 | /* Now invert Y if needed. |
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| 77 | * Gallium drivers use the convention Y=0=top for surfaces. |
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| 78 | */ |
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| 79 | if (st_fb_orientation(fb) == Y_0_TOP) { |
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| 80 | miny = fb->Height - scissor.maxy; |
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| 81 | maxy = fb->Height - scissor.miny; |
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| 82 | scissor.miny = miny; |
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| 83 | scissor.maxy = maxy; |
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| 84 | } |
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| 85 | |||
| 86 | if (memcmp(&scissor, &st->state.scissor, sizeof(scissor)) != 0) { |
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| 87 | /* state has changed */ |
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| 88 | st->state.scissor = scissor; /* struct copy */ |
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| 89 | st->pipe->set_scissor_states(st->pipe, 0, 1, &scissor); /* activate */ |
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| 90 | } |
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| 91 | } |
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| 92 | |||
| 93 | |||
| 94 | const struct st_tracked_state st_update_scissor = { |
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| 95 | "st_update_scissor", /* name */ |
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| 96 | { /* dirty */ |
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| 97 | (_NEW_SCISSOR | _NEW_BUFFERS), /* mesa */ |
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| 98 | 0, /* st */ |
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| 99 | }, |
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| 100 | update_scissor /* update */ |
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| 101 | }; |