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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 | } |