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| Rev | Author | Line No. | Line |
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| 55 | pj | 1 | /* $Id: fog.c,v 1.1 2003-02-28 11:42:00 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 3.5 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2001 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 | |||
| 28 | #include "glheader.h" |
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| 29 | #include "colormac.h" |
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| 30 | #include "context.h" |
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| 31 | #include "fog.h" |
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| 32 | #include "mtypes.h" |
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| 33 | |||
| 34 | |||
| 35 | |||
| 36 | void |
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| 37 | _mesa_Fogf(GLenum pname, GLfloat param) |
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| 38 | { |
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| 39 | _mesa_Fogfv(pname, ¶m); |
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| 40 | } |
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| 41 | |||
| 42 | |||
| 43 | void |
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| 44 | _mesa_Fogi(GLenum pname, GLint param ) |
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| 45 | { |
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| 46 | GLfloat fparam = (GLfloat) param; |
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| 47 | _mesa_Fogfv(pname, &fparam); |
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| 48 | } |
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| 49 | |||
| 50 | |||
| 51 | void |
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| 52 | _mesa_Fogiv(GLenum pname, const GLint *params ) |
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| 53 | { |
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| 54 | GLfloat p[4]; |
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| 55 | switch (pname) { |
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| 56 | case GL_FOG_MODE: |
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| 57 | case GL_FOG_DENSITY: |
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| 58 | case GL_FOG_START: |
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| 59 | case GL_FOG_END: |
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| 60 | case GL_FOG_INDEX: |
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| 61 | case GL_FOG_COORDINATE_SOURCE_EXT: |
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| 62 | p[0] = (GLfloat) *params; |
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| 63 | break; |
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| 64 | case GL_FOG_COLOR: |
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| 65 | p[0] = INT_TO_FLOAT( params[0] ); |
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| 66 | p[1] = INT_TO_FLOAT( params[1] ); |
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| 67 | p[2] = INT_TO_FLOAT( params[2] ); |
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| 68 | p[3] = INT_TO_FLOAT( params[3] ); |
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| 69 | break; |
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| 70 | default: |
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| 71 | /* Error will be caught later in _mesa_Fogfv */ |
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| 72 | ; |
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| 73 | } |
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| 74 | _mesa_Fogfv(pname, p); |
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| 75 | } |
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| 76 | |||
| 77 | |||
| 78 | void |
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| 79 | _mesa_Fogfv( GLenum pname, const GLfloat *params ) |
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| 80 | { |
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| 81 | GET_CURRENT_CONTEXT(ctx); |
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| 82 | GLenum m; |
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| 83 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 84 | |||
| 85 | switch (pname) { |
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| 86 | case GL_FOG_MODE: |
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| 87 | m = (GLenum) (GLint) *params; |
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| 88 | switch (m) { |
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| 89 | case GL_LINEAR: |
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| 90 | case GL_EXP: |
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| 91 | case GL_EXP2: |
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| 92 | break; |
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| 93 | default: |
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| 94 | _mesa_error( ctx, GL_INVALID_ENUM, "glFog" ); |
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| 95 | return; |
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| 96 | } |
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| 97 | if (ctx->Fog.Mode == m) |
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| 98 | return; |
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| 99 | FLUSH_VERTICES(ctx, _NEW_FOG); |
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| 100 | ctx->Fog.Mode = m; |
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| 101 | break; |
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| 102 | case GL_FOG_DENSITY: |
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| 103 | if (*params<0.0) { |
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| 104 | _mesa_error( ctx, GL_INVALID_VALUE, "glFog" ); |
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| 105 | return; |
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| 106 | } |
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| 107 | if (ctx->Fog.Density == *params) |
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| 108 | return; |
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| 109 | FLUSH_VERTICES(ctx, _NEW_FOG); |
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| 110 | ctx->Fog.Density = *params; |
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| 111 | break; |
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| 112 | case GL_FOG_START: |
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| 113 | if (ctx->Fog.Start == *params) |
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| 114 | return; |
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| 115 | FLUSH_VERTICES(ctx, _NEW_FOG); |
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| 116 | ctx->Fog.Start = *params; |
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| 117 | break; |
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| 118 | case GL_FOG_END: |
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| 119 | if (ctx->Fog.End == *params) |
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| 120 | return; |
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| 121 | FLUSH_VERTICES(ctx, _NEW_FOG); |
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| 122 | ctx->Fog.End = *params; |
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| 123 | break; |
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| 124 | case GL_FOG_INDEX: |
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| 125 | if (ctx->Fog.Index == *params) |
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| 126 | return; |
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| 127 | FLUSH_VERTICES(ctx, _NEW_FOG); |
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| 128 | ctx->Fog.Index = *params; |
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| 129 | break; |
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| 130 | case GL_FOG_COLOR: |
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| 131 | if (TEST_EQ_4V(ctx->Fog.Color, params)) |
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| 132 | return; |
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| 133 | FLUSH_VERTICES(ctx, _NEW_FOG); |
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| 134 | ctx->Fog.Color[0] = params[0]; |
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| 135 | ctx->Fog.Color[1] = params[1]; |
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| 136 | ctx->Fog.Color[2] = params[2]; |
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| 137 | ctx->Fog.Color[3] = params[3]; |
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| 138 | break; |
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| 139 | case GL_FOG_COORDINATE_SOURCE_EXT: { |
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| 140 | GLenum p = (GLenum) (GLint) *params; |
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| 141 | if (!ctx->Extensions.EXT_fog_coord || |
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| 142 | (p != GL_FOG_COORDINATE_EXT && p != GL_FRAGMENT_DEPTH_EXT)) { |
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| 143 | _mesa_error(ctx, GL_INVALID_ENUM, "glFog"); |
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| 144 | return; |
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| 145 | } |
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| 146 | if (ctx->Fog.FogCoordinateSource == p) |
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| 147 | return; |
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| 148 | FLUSH_VERTICES(ctx, _NEW_FOG); |
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| 149 | ctx->Fog.FogCoordinateSource = p; |
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| 150 | break; |
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| 151 | } |
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| 152 | default: |
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| 153 | _mesa_error( ctx, GL_INVALID_ENUM, "glFog" ); |
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| 154 | return; |
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| 155 | } |
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| 156 | |||
| 157 | if (ctx->Driver.Fogfv) { |
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| 158 | (*ctx->Driver.Fogfv)( ctx, pname, params ); |
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| 159 | } |
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| 160 | } |