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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 | } |