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55 | pj | 1 | /* $Id: accum.c,v 1.1 2003-02-28 11:41:57 pj Exp $ */ |
2 | |||
3 | /* |
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4 | * Mesa 3-D graphics library |
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5 | * Version: 4.1 |
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6 | * |
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7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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8 | * |
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9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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10 | * copy of this software and associated documentation files (the "Software"), |
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11 | * to deal in the Software without restriction, including without limitation |
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12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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13 | * and/or sell copies of the Software, and to permit persons to whom the |
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14 | * Software is furnished to do so, subject to the following conditions: |
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15 | * |
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16 | * The above copyright notice and this permission notice shall be included |
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17 | * in all copies or substantial portions of the Software. |
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18 | * |
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19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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25 | */ |
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26 | |||
27 | #include "glheader.h" |
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28 | #include "accum.h" |
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29 | #include "context.h" |
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30 | #include "imports.h" |
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31 | #include "macros.h" |
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32 | #include "state.h" |
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33 | #include "mtypes.h" |
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34 | |||
35 | |||
36 | void |
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37 | _mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha ) |
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38 | { |
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39 | GLfloat tmp[4]; |
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40 | GET_CURRENT_CONTEXT(ctx); |
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41 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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42 | |||
43 | tmp[0] = CLAMP( red, -1.0F, 1.0F ); |
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44 | tmp[1] = CLAMP( green, -1.0F, 1.0F ); |
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45 | tmp[2] = CLAMP( blue, -1.0F, 1.0F ); |
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46 | tmp[3] = CLAMP( alpha, -1.0F, 1.0F ); |
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47 | |||
48 | if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor)) |
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49 | return; |
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50 | |||
51 | FLUSH_VERTICES(ctx, _NEW_ACCUM); |
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52 | COPY_4FV( ctx->Accum.ClearColor, tmp ); |
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53 | } |
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54 | |||
55 | /* Should really be a driver-supplied function? |
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56 | */ |
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57 | void |
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58 | _mesa_Accum( GLenum op, GLfloat value ) |
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59 | { |
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60 | GET_CURRENT_CONTEXT(ctx); |
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61 | GLuint xpos, ypos, width, height; |
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62 | ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); |
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63 | |||
64 | if (ctx->Visual.accumRedBits == 0 || ctx->DrawBuffer != ctx->ReadBuffer) { |
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65 | _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum"); |
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66 | return; |
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67 | } |
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68 | |||
69 | if (ctx->NewState) |
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70 | _mesa_update_state( ctx ); |
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71 | |||
72 | /* Determine region to operate upon. */ |
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73 | if (ctx->Scissor.Enabled) { |
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74 | xpos = ctx->Scissor.X; |
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75 | ypos = ctx->Scissor.Y; |
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76 | width = ctx->Scissor.Width; |
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77 | height = ctx->Scissor.Height; |
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78 | } |
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79 | else { |
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80 | /* whole window */ |
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81 | xpos = 0; |
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82 | ypos = 0; |
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83 | width = ctx->DrawBuffer->Width; |
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84 | height = ctx->DrawBuffer->Height; |
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85 | } |
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86 | |||
87 | ctx->Driver.Accum( ctx, op, value, xpos, ypos, width, height ); |
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88 | } |