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| 1901 | serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * Version: 7.1 |
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| 4 | * |
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| 5 | * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. |
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| 6 | * |
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| 7 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 8 | * copy of this software and associated documentation files (the "Software"), |
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| 9 | * to deal in the Software without restriction, including without limitation |
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| 10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 11 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 12 | * Software is furnished to do so, subject to the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice shall be included |
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| 15 | * in all copies or substantial portions of the Software. |
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| 16 | * |
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| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 18 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 20 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 21 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 22 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 23 | */ |
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| 24 | |||
| 25 | |||
| 26 | #include "main/glheader.h" |
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| 27 | #include "main/context.h" |
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| 28 | #include "main/scissor.h" |
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| 29 | |||
| 30 | |||
| 31 | /** |
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| 32 | * Called via glScissor |
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| 33 | */ |
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| 34 | void GLAPIENTRY |
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| 35 | _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) |
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| 36 | { |
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| 37 | GET_CURRENT_CONTEXT(ctx); |
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| 38 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 39 | |||
| 40 | if (MESA_VERBOSE & VERBOSE_API) |
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| 41 | _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height); |
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| 42 | |||
| 43 | if (width < 0 || height < 0) { |
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| 44 | _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" ); |
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| 45 | return; |
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| 46 | } |
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| 47 | |||
| 48 | _mesa_set_scissor(ctx, x, y, width, height); |
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| 49 | } |
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| 50 | |||
| 51 | |||
| 52 | /** |
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| 53 | * Define the scissor box. |
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| 54 | * |
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| 55 | * \param x, y coordinates of the scissor box lower-left corner. |
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| 56 | * \param width width of the scissor box. |
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| 57 | * \param height height of the scissor box. |
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| 58 | * |
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| 59 | * \sa glScissor(). |
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| 60 | * |
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| 61 | * Verifies the parameters and updates __struct gl_contextRec::Scissor. On a |
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| 62 | * change flushes the vertices and notifies the driver via |
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| 63 | * the dd_function_table::Scissor callback. |
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| 64 | */ |
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| 65 | void |
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| 66 | _mesa_set_scissor(struct gl_context *ctx, |
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| 67 | GLint x, GLint y, GLsizei width, GLsizei height) |
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| 68 | { |
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| 69 | if (x == ctx->Scissor.X && |
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| 70 | y == ctx->Scissor.Y && |
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| 71 | width == ctx->Scissor.Width && |
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| 72 | height == ctx->Scissor.Height) |
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| 73 | return; |
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| 74 | |||
| 75 | FLUSH_VERTICES(ctx, _NEW_SCISSOR); |
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| 76 | ctx->Scissor.X = x; |
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| 77 | ctx->Scissor.Y = y; |
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| 78 | ctx->Scissor.Width = width; |
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| 79 | ctx->Scissor.Height = height; |
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| 80 | |||
| 81 | if (ctx->Driver.Scissor) |
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| 82 | ctx->Driver.Scissor( ctx, x, y, width, height ); |
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| 83 | } |
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| 84 | |||
| 85 | |||
| 86 | /** |
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| 87 | * Initialize the context's scissor state. |
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| 88 | * \param ctx the GL context. |
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| 89 | */ |
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| 90 | void |
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| 91 | _mesa_init_scissor(struct gl_context *ctx) |
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| 92 | { |
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| 93 | /* Scissor group */ |
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| 94 | ctx->Scissor.Enabled = GL_FALSE; |
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| 95 | ctx->Scissor.X = 0; |
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| 96 | ctx->Scissor.Y = 0; |
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| 97 | ctx->Scissor.Width = 0; |
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| 98 | ctx->Scissor.Height = 0; |
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| 99 | } |