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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 | |||
| 29 | #include "main/context.h" |
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| 30 | #include "st_context.h" |
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| 31 | #include "st_atom.h" |
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| 32 | #include "pipe/p_context.h" |
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| 33 | #include "cso_cache/cso_context.h" |
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| 34 | |||
| 35 | /** |
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| 36 | * Update the viewport transformation matrix. Depends on: |
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| 37 | * - viewport pos/size |
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| 38 | * - depthrange |
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| 39 | * - window pos/size or FBO size |
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| 40 | */ |
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| 41 | static void |
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| 42 | update_viewport( struct st_context *st ) |
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| 43 | { |
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| 44 | struct gl_context *ctx = st->ctx; |
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| 45 | GLfloat yScale, yBias; |
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| 46 | |||
| 47 | /* _NEW_BUFFERS |
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| 48 | */ |
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| 49 | if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) { |
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| 50 | yScale = -1; |
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| 51 | yBias = (GLfloat)ctx->DrawBuffer->Height; |
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| 52 | } |
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| 53 | else { |
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| 54 | yScale = 1.0; |
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| 55 | yBias = 0.0; |
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| 56 | } |
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| 57 | |||
| 58 | /* _NEW_VIEWPORT |
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| 59 | */ |
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| 60 | { |
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| 61 | GLfloat x = (GLfloat)ctx->Viewport.X; |
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| 62 | GLfloat y = (GLfloat)ctx->Viewport.Y; |
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| 63 | GLfloat z = ctx->Viewport.Near; |
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| 64 | GLfloat half_width = (GLfloat)ctx->Viewport.Width * 0.5f; |
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| 65 | GLfloat half_height = (GLfloat)ctx->Viewport.Height * 0.5f; |
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| 66 | GLfloat half_depth = (GLfloat)(ctx->Viewport.Far - ctx->Viewport.Near) * 0.5f; |
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| 67 | |||
| 68 | st->state.viewport.scale[0] = half_width; |
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| 69 | st->state.viewport.scale[1] = half_height * yScale; |
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| 70 | st->state.viewport.scale[2] = half_depth; |
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| 71 | st->state.viewport.scale[3] = 1.0; |
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| 72 | |||
| 73 | st->state.viewport.translate[0] = half_width + x; |
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| 74 | st->state.viewport.translate[1] = (half_height + y) * yScale + yBias; |
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| 75 | st->state.viewport.translate[2] = half_depth + z; |
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| 76 | st->state.viewport.translate[3] = 0.0; |
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| 77 | |||
| 78 | cso_set_viewport(st->cso_context, &st->state.viewport); |
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| 79 | } |
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| 80 | } |
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| 81 | |||
| 82 | |||
| 83 | const struct st_tracked_state st_update_viewport = { |
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| 84 | "st_update_viewport", /* name */ |
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| 85 | { /* dirty */ |
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| 86 | _NEW_BUFFERS | _NEW_VIEWPORT, /* mesa */ |
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| 87 | 0, /* st */ |
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| 88 | }, |
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| 89 | update_viewport /* update */ |
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| 90 | }; |