1 | /* |
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2 | |
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3 | Homan Igehy |
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4 | |
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5 | Computer Graphics Laboratory |
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6 | Stanford University |
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7 | |
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8 | --------------------------------------------------------------------- |
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9 | |
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10 | Copyright (1997) The Board of Trustees of the Leland Stanford Junior |
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11 | University. Except for commercial resale, lease, license or other |
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12 | commercial transactions, permission is hereby given to use, copy, |
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13 | modify this software for academic purposes only. No part of this |
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14 | software or any derivatives thereof may be used in the production of |
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15 | computer models for resale or for use in a commercial |
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16 | product. STANFORD MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND |
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17 | CONCERNING THIS SOFTWARE. No support is implied or provided. |
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18 | |
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19 | */ |
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20 | |
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21 | |
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22 | /* |
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23 | * sl_framebuffer.I |
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24 | * |
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25 | */ |
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26 | |
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27 | #ifndef SL_FRAMEBUFFER_I |
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28 | #define SL_FRAMEBUFFER_I |
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29 | |
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30 | #include "sl_val.H" |
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31 | #include "sl_framebuffer.H" |
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32 | #include "sl_hack.H" |
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33 | #include "sl_texture.H" |
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34 | #include "sl_texture.I" |
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35 | |
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36 | |
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37 | #include <iostream> |
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38 | #include <stdio.h> |
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39 | |
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40 | #ifdef SampleCalc_Dda |
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41 | #define get(i) (cur##i) |
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42 | #endif |
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43 | |
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44 | #ifdef SampleCalc_Ddx |
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45 | #define get(i) (cur##i + (ddx##i * curx)) |
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46 | #endif |
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47 | |
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48 | |
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49 | static inline void |
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50 | BufferSample( |
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51 | #ifdef SampleCalc_Ddx |
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52 | const Real curx, |
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53 | #endif |
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54 | IN_FormalArgs(cur) |
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55 | #ifdef SampleCalc_Ddx |
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56 | IN_FormalConstArgs(ddx) |
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57 | #endif |
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58 | CA_FormalConstArgs(cur) |
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59 | #ifdef LevelOfDetail |
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60 | Real numParX, Real numParY, |
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61 | #endif |
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62 | FB_FormalArgs(* sample) |
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63 | ) |
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64 | { |
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65 | |
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66 | #ifdef ZBuffer |
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67 | if (get(Z) > FB_Z(sample)) { |
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68 | FB_Z(sample) = get(Z); |
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69 | #endif |
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70 | |
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71 | |
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72 | #ifdef Interpolate_Color |
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73 | Real R = get(R); |
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74 | Real G = get(G); |
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75 | Real B = get(B); |
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76 | #endif |
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77 | |
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78 | #ifdef TextureCoord |
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79 | Real inv_w = REAL_ONE / get(W); |
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80 | Real S = get(U) * inv_w; |
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81 | Real T = get(V) * inv_w; |
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82 | #endif |
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83 | |
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84 | |
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85 | #ifdef LevelOfDetail |
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86 | Real D = ((numParX > numParY) ? numParX : numParY) * inv_w * inv_w; |
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87 | G = D; |
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88 | #endif |
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89 | |
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90 | |
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91 | #ifdef PointSampleTexture |
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92 | PointSample(curT, S, T, R, G, B); |
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93 | #endif |
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94 | |
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95 | #ifdef Interpolate_Color |
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96 | |
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97 | #ifndef Alpha |
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98 | |
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99 | FB_R(sample) = FB_InterpToSample(R); |
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100 | FB_G(sample) = FB_InterpToSample(G); |
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101 | FB_B(sample) = FB_InterpToSample(B); |
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102 | |
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103 | #else |
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104 | |
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105 | #ifdef Constant_A |
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106 | Real alpha = curA; |
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107 | #else |
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108 | Real alpha = get(A); |
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109 | #endif |
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110 | |
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111 | |
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112 | FB_R(sample) = red + alpha * (FB_SampleToInterp(FB_R(sample)) - red ); |
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113 | FB_G(sample) = green + alpha * (FB_SampleToInterp(FB_G(sample)) - green); |
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114 | FB_B(sample) = blue + alpha * (FB_SampleToInterp(FB_B(sample)) - blue ); |
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115 | FB_A(sample) = alpha + alpha * (FB_SampleToInterp(FB_R(sample)) - alpha); |
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116 | |
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117 | |
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118 | #endif /* Alpha */ |
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119 | |
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120 | #endif /* Interpolate_Color */ |
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121 | |
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122 | #ifdef Interpolate_Intensity |
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123 | FB_I(sample) = FB_InterpToSample(get(I)); |
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124 | #endif |
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125 | |
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126 | |
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127 | #ifdef Constant_PackedColor |
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128 | FB_C(sample) = curC; |
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129 | #endif |
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130 | |
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131 | |
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132 | #ifdef ZBuffer |
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133 | } |
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134 | #endif |
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135 | |
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136 | |
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137 | } |
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138 | |
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139 | |
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140 | |
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141 | |
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142 | #endif /* FRAMEBUFFER_I */ |
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