annotate semicongine/core/matrix.nim @ 920:c66503386e8b

Merge branch 'main' of github.com:saemideluxe/semicongine
author Sam <sam@basx.dev>
date Thu, 21 Mar 2024 15:39:42 +0700
parents b1e500d0ed07 7f430850e587
children fe48fb1bdfda
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1 import std/math
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2 import std/macros
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3 import std/random
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4 import std/strutils
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5 import std/strformat
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6 import std/typetraits
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7
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8 import ./vector
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9
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10 export math
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11
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12 type
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13 # layout is row-first
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14 # having an object instead of directly aliasing the array seems a bit ugly at
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15 # first, but is necessary to be able to work correctly with distinguished
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16 # types (i.e. TMat23 and TMat32 would be an alias for the same type array[6, T]
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17 # which prevents the type system from identifying the correct type at times)
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18 #
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19 # Though, great news is that objects have zero overhead!
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20 TMat2*[T: SomeNumber] = object
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21 data*: array[4, T]
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22 TMat23*[T: SomeNumber] = object
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23 data*: array[6, T]
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24 TMat32*[T: SomeNumber] = object
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25 data*: array[6, T]
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26 TMat3*[T: SomeNumber] = object
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27 data*: array[9, T]
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28 TMat34*[T: SomeNumber] = object
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29 data*: array[12, T]
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30 TMat43*[T: SomeNumber] = object
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31 data*: array[12, T]
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32 TMat4*[T: SomeNumber] = object
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33 data*: array[16, T]
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34 TMat* = TMat2|TMat3|TMat4|TMat23|TMat32|TMat34|TMat43
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35 Mat2* = TMat2[float32]
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36 Mat23* = TMat23[float32]
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37 Mat32* = TMat32[float32]
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38 Mat3* = TMat3[float32]
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39 Mat34* = TMat34[float32]
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40 Mat43* = TMat43[float32]
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41 Mat4* = TMat4[float32]
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42
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43 func unit2[T: SomeNumber](): auto {.compiletime.} = TMat2[T](data: [
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44 T(1), T(0),
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45 T(0), T(1),
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46 ])
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47 func unit3[T: SomeNumber](): auto {.compiletime.} = TMat3[T](data: [
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48 T(1), T(0), T(0),
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49 T(0), T(1), T(0),
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50 T(0), T(0), T(1),
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51 ])
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52 func unit4[T: SomeNumber](): auto {.compiletime.} = TMat4[T](data: [
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53 T(1), T(0), T(0), T(0),
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54 T(0), T(1), T(0), T(0),
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55 T(0), T(0), T(1), T(0),
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56 T(0), T(0), T(0), T(1),
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57 ])
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58
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59 # generates constants: Unit
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60 # Also for Y, Z, R, G, B
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61 # not sure if this is necessary or even a good idea...
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62 macro generateAllConsts() =
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63 result = newStmtList()
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64 for theType in ["int", "int8", "int16", "int32", "int64", "float", "float32", "float64"]:
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65 var typename = theType[0 .. 0]
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66 if theType[^2].isDigit:
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67 typename = typename & theType[^2]
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68 if theType[^1].isDigit:
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69 typename = typename & theType[^1]
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70 result.add(newConstStmt(
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71 postfix(ident("Unit2" & typename), "*"),
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72 newCall(nnkBracketExpr.newTree(ident("unit2"), ident(theType)))
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73 ))
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74 result.add(newConstStmt(
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75 postfix(ident("Unit3" & typename), "*"),
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76 newCall(nnkBracketExpr.newTree(ident("unit3"), ident(theType)))
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77 ))
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78 result.add(newConstStmt(
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79 postfix(ident("Unit4" & typename), "*"),
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80 newCall(nnkBracketExpr.newTree(ident("unit4"), ident(theType)))
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81 ))
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82
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83 generateAllConsts()
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84
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85 const Unit2* = unit2[float32]()
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86 const Unit3* = unit3[float32]()
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87 const Unit4* = unit4[float32]()
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88
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89 template rowCount*(m: typedesc): int =
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90 when m is TMat2: 2
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91 elif m is TMat23: 2
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92 elif m is TMat32: 3
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93 elif m is TMat3: 3
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94 elif m is TMat34: 3
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95 elif m is TMat43: 4
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96 elif m is TMat4: 4
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97 template columnCount*(m: typedesc): int =
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98 when m is TMat2: 2
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99 elif m is TMat23: 3
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100 elif m is TMat32: 2
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101 elif m is TMat3: 3
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102 elif m is TMat34: 4
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103 elif m is TMat43: 3
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104 elif m is TMat4: 4
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105 template matlen*(m: typedesc): int =
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106 when m is TMat2: 4
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107 elif m is TMat23: 6
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108 elif m is TMat32: 6
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109 elif m is TMat3: 9
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110 elif m is TMat34: 12
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111 elif m is TMat43: 12
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112 elif m is TMat4: 16
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113
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114
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115 func toString[T](value: T): string =
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116 var
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117 strvalues: seq[string]
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118 maxwidth = 0
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119
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120 for n in value.data:
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121 let strval = &"{n:.2}"
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122 strvalues.add(strval)
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123 if strval.len > maxwidth:
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124 maxwidth = strval.len
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125
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126 for i in 0 ..< strvalues.len:
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127 let filler = " ".repeat(maxwidth - strvalues[i].len)
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128 if i mod T.columnCount == T.columnCount - 1:
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129 result &= filler & strvalues[i] & "\n"
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130 else:
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131 if i mod T.columnCount == 0:
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132 result &= " "
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133 result &= filler & strvalues[i] & " "
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134 result = $T & "\n" & result
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135
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136 func `$`*(v: TMat2[SomeNumber]): string = toString[TMat2[SomeNumber]](v)
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137 func `$`*(v: TMat23[SomeNumber]): string = toString[TMat23[SomeNumber]](v)
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138 func `$`*(v: TMat32[SomeNumber]): string = toString[TMat32[SomeNumber]](v)
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139 func `$`*(v: TMat3[SomeNumber]): string = toString[TMat3[SomeNumber]](v)
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140 func `$`*(v: TMat34[SomeNumber]): string = toString[TMat34[SomeNumber]](v)
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141 func `$`*(v: TMat43[SomeNumber]): string = toString[TMat43[SomeNumber]](v)
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142 func `$`*(v: TMat4[SomeNumber]): string = toString[TMat4[SomeNumber]](v)
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143
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144 func `[]`*[T: TMat](m: T, row, col: int): auto = m.data[col + row * T.columnCount]
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145 func `[]=`*[T: TMat, U](m: var T, row, col: int, value: U) = m.data[col + row * T.columnCount] = value
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146 func `[]`*[T: TMat](m: T, i: int): auto = m.data[i]
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147 func `[]=`*[T: TMat, U](m: var T, i: int, value: U) = m.data[i] = value
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148
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149 func row*[T: TMat2](m: T, i: 0..1): auto = TVec2([m[i, 0], m[i, 1]])
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150 func row*[T: TMat32](m: T, i: 0..2): auto = TVec2([m[i, 0], m[i, 1]])
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151 func row*[T: TMat23](m: T, i: 0..1): auto = TVec3([m[i, 0], m[i, 1], m[i, 2]])
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152 func row*[T: TMat3](m: T, i: 0..2): auto = TVec3([m[i, 0], m[i, 1], m[i, 2]])
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153 func row*[T: TMat43](m: T, i: 0..3): auto = TVec3([m[i, 0], m[i, 1], m[i, 2]])
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154 func row*[T: TMat34](m: T, i: 0..2): auto = TVec4([m[i, 0], m[i, 1], m[i, 2], m[i, 3]])
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155 func row*[T: TMat4](m: T, i: 0..3): auto = TVec4([m[i, 0], m[i, 1], m[i, 2], m[i, 3]])
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156
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157 func col*[T: TMat2](m: T, i: 0..1): auto = TVec2([m[0, i], m[1, i]])
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158 func col*[T: TMat23](m: T, i: 0..2): auto = TVec2([m[0, i], m[1, i]])
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159 func col*[T: TMat32](m: T, i: 0..1): auto = TVec3([m[0, i], m[1, i], m[2, i]])
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160 func col*[T: TMat3](m: T, i: 0..2): auto = TVec3([m[0, i], m[1, i], m[2, i]])
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161 func col*[T: TMat34](m: T, i: 0..3): auto = TVec3([m[0, i], m[1, i], m[2, i]])
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162 func col*[T: TMat43](m: T, i: 0..2): auto = TVec4([m[0, i], m[1, i], m[2, i], m[3, i]])
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163 func col*[T: TMat4](m: T, i: 0..3): auto = TVec4([m[0, i], m[1, i], m[2, i], m[3, i]])
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164
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165 proc createMatMatMultiplicationOperator(leftType: typedesc, rightType: typedesc, outType: typedesc): NimNode =
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166 var data = nnkBracket.newTree()
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167 for i in 0 ..< rowCount(leftType):
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168 for j in 0 ..< rightType.columnCount:
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169 data.add(newCall(
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170 ident("sum"),
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171 infix(
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172 newCall(newDotExpr(ident("a"), ident("row")), newLit(i)),
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173 "*",
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174 newCall(newDotExpr(ident("b"), ident("col")), newLit(j))
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175 )
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176 ))
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177
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178 return newProc(
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179 postfix(nnkAccQuoted.newTree(ident("*")), "*"),
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180 params = [
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181 ident("auto"),
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182 newIdentDefs(ident("a"), ident(leftType.name)),
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183 newIdentDefs(ident("b"), ident(rightType.name))
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184 ],
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185 body = nnkObjConstr.newTree(ident(outType.name), nnkExprColonExpr.newTree(ident("data"), data)),
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186 procType = nnkFuncDef,
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187 )
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188
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189 proc createMatMatAdditionOperator(theType: typedesc): NimNode =
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190 var data = nnkBracket.newTree()
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191 for i in 0 ..< matlen(theType):
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192 data.add(
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193 infix(
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194 nnkBracketExpr.newTree(ident("a"), newLit(i)),
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195 "+",
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196 nnkBracketExpr.newTree(ident("b"), newLit(i)),
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197 ))
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198
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199 return newProc(
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200 postfix(nnkAccQuoted.newTree(ident("+")), "*"),
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201 params = [
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202 ident("auto"),
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203 newIdentDefs(ident("a"), ident(theType.name)),
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204 newIdentDefs(ident("b"), ident(theType.name))
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205 ],
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206 body = nnkObjConstr.newTree(ident(theType.name), nnkExprColonExpr.newTree(ident("data"), data)),
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207 procType = nnkFuncDef,
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208 )
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209
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210 proc createVecMatMultiplicationOperator(matType: typedesc, vecType: typedesc): NimNode =
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211 var data = nnkBracket.newTree()
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212 for i in 0 ..< matType.rowCount:
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213 data.add(newCall(
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214 ident("sum"),
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215 infix(
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216 ident("v"),
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217 "*",
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218 newCall(newDotExpr(ident("m"), ident("row")), newLit(i))
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219 )
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220 ))
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221
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222 let resultVec = newCall(
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223 nnkBracketExpr.newTree(ident(vecType.name), ident("T")),
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224 data,
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225 )
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226 let name = postfix(nnkAccQuoted.newTree(ident("*")), "*")
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227 let genericParams = nnkGenericParams.newTree(nnkIdentDefs.newTree(ident("T"), ident("SomeNumber"), newEmptyNode()))
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228 let formalParams = nnkFormalParams.newTree(
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229 ident("auto"),
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230 newIdentDefs(ident("m"), nnkBracketExpr.newTree(ident(matType.name), ident("T"))),
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231 newIdentDefs(ident("v"), nnkBracketExpr.newTree(ident(vecType.name), ident("T"))),
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232 )
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233
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234 return nnkFuncDef.newTree(
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235 name,
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236 newEmptyNode(),
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237 genericParams,
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238 formalParams,
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239 newEmptyNode(),
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240 newEmptyNode(),
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241 resultVec
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242 )
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243
840
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244
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245 proc createMatScalarOperator(matType: typedesc, op: string): NimNode =
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246 result = newStmtList()
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247
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248 var data = nnkBracket.newTree()
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249 for i in 0 ..< matType.rowCount * matType.columnCount:
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250 data.add(infix(nnkBracketExpr.newTree(newDotExpr(ident("a"), ident("data")), newLit(i)), op, ident("b")))
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251 result.add(newProc(
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252 postfix(nnkAccQuoted.newTree(ident(op)), "*"),
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253 params = [
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254 ident("auto"),
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255 newIdentDefs(ident("a"), ident(matType.name)),
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256 newIdentDefs(ident("b"), ident("SomeNumber")),
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257 ],
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258 body = nnkObjConstr.newTree(ident(matType.name), nnkExprColonExpr.newTree(ident("data"), data)),
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259 procType = nnkFuncDef,
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260 ))
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261 result.add(newProc(
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262 postfix(nnkAccQuoted.newTree(ident(op)), "*"),
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263 params = [
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264 ident("auto"),
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265 newIdentDefs(ident("b"), ident("SomeNumber")),
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266 newIdentDefs(ident("a"), ident(matType.name)),
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267 ],
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268 body = nnkObjConstr.newTree(ident(matType.name), nnkExprColonExpr.newTree(ident("data"), data)),
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269 procType = nnkFuncDef,
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270 ))
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271 if op == "-":
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272 var data2 = nnkBracket.newTree()
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273 for i in 0 ..< matType.rowCount * matType.columnCount:
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274 data2.add(prefix(nnkBracketExpr.newTree(newDotExpr(ident("a"), ident("data")), newLit(i)), op))
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275 result.add(newProc(
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276 postfix(nnkAccQuoted.newTree(ident(op)), "*"),
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277 params = [
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278 ident("auto"),
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279 newIdentDefs(ident("a"), ident(matType.name)),
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280 ],
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281 body = nnkObjConstr.newTree(ident(matType.name), nnkExprColonExpr.newTree(ident("data"), data2)),
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282 procType = nnkFuncDef,
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283 ))
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284
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285 macro createAllMultiplicationOperators() =
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286 result = newStmtList()
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287
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288 for op in ["+", "-", "*", "/"]:
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289 result.add(createMatScalarOperator(TMat2, op))
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290 result.add(createMatScalarOperator(TMat23, op))
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291 result.add(createMatScalarOperator(TMat32, op))
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292 result.add(createMatScalarOperator(TMat3, op))
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293 result.add(createMatScalarOperator(TMat34, op))
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294 result.add(createMatScalarOperator(TMat43, op))
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295 result.add(createMatScalarOperator(TMat4, op))
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296
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297 result.add(createMatMatMultiplicationOperator(TMat2, TMat2, TMat2))
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298 result.add(createMatMatMultiplicationOperator(TMat2, TMat23, TMat23))
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299 result.add(createMatMatMultiplicationOperator(TMat23, TMat32, TMat2))
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300 result.add(createMatMatMultiplicationOperator(TMat23, TMat3, TMat23))
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301 result.add(createMatMatMultiplicationOperator(TMat32, TMat2, TMat32))
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302 result.add(createMatMatMultiplicationOperator(TMat32, TMat23, TMat3))
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303 result.add(createMatMatMultiplicationOperator(TMat3, TMat32, TMat32))
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304 result.add(createMatMatMultiplicationOperator(TMat3, TMat3, TMat3))
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305 result.add(createMatMatMultiplicationOperator(TMat3, TMat34, TMat34))
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306 result.add(createMatMatMultiplicationOperator(TMat43, TMat3, TMat43))
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307 result.add(createMatMatMultiplicationOperator(TMat43, TMat34, TMat4))
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308 result.add(createMatMatMultiplicationOperator(TMat4, TMat43, TMat43))
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309 result.add(createMatMatMultiplicationOperator(TMat4, TMat4, TMat4))
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310
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311 result.add(createMatMatAdditionOperator(TMat2))
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312 result.add(createMatMatAdditionOperator(TMat23))
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313 result.add(createMatMatAdditionOperator(TMat32))
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314 result.add(createMatMatAdditionOperator(TMat3))
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315 result.add(createMatMatAdditionOperator(TMat34))
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316 result.add(createMatMatAdditionOperator(TMat43))
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317 result.add(createMatMatAdditionOperator(TMat4))
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318
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319 result.add(createVecMatMultiplicationOperator(TMat2, TVec2))
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320 result.add(createVecMatMultiplicationOperator(TMat3, TVec3))
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321 result.add(createVecMatMultiplicationOperator(TMat4, TVec4))
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322
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323 createAllMultiplicationOperators()
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324
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325 func `*`*(mat: Mat4, vec: Vec3f): Vec3f =
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326 (mat * vec.toVec4(1)).toVec3
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327
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328 func transposed*[T](m: TMat2[T]): TMat2[T] = TMat2[T](data: [
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329 m[0, 0], m[1, 0],
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330 m[0, 1], m[1, 1],
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diff changeset
331 ])
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332 func transposed*[T](m: TMat23[T]): TMat32[T] = TMat32[T](data: [
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333 m[0, 0], m[1, 0],
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334 m[0, 1], m[1, 1],
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diff changeset
335 m[0, 2], m[1, 2],
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diff changeset
336 ])
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337 func transposed*[T](m: TMat32[T]): TMat23[T] = TMat23[T](data: [
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338 m[0, 0], m[1, 0], m[2, 0],
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339 m[0, 1], m[1, 1], m[2, 1],
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diff changeset
340 ])
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341 func transposed*[T](m: TMat3[T]): TMat3[T] = TMat3[T](data: [
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342 m[0, 0], m[1, 0], m[2, 0],
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diff changeset
343 m[0, 1], m[1, 1], m[2, 1],
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344 m[0, 2], m[1, 2], m[2, 2],
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345 ])
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346 func transposed*[T](m: TMat43[T]): TMat34[T] = TMat34[T](data: [
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347 m[0, 0], m[1, 0], m[2, 0], m[3, 0],
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348 m[0, 1], m[1, 1], m[2, 1], m[3, 1],
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349 m[0, 2], m[1, 2], m[2, 2], m[3, 2],
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350 ])
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351 func transposed*[T](m: TMat34[T]): TMat43[T] = TMat43[T](data: [
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352 m[0, 0], m[1, 0], m[2, 0],
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diff changeset
353 m[0, 1], m[1, 1], m[2, 1],
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354 m[0, 2], m[1, 2], m[2, 2],
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355 m[0, 3], m[1, 3], m[2, 3],
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diff changeset
356 ])
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357 func transposed*[T](m: TMat4[T]): TMat4[T] = TMat4[T](data: [
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358 m[0, 0], m[1, 0], m[2, 0], m[3, 0],
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359 m[0, 1], m[1, 1], m[2, 1], m[3, 1],
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diff changeset
360 m[0, 2], m[1, 2], m[2, 2], m[3, 2],
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361 m[0, 3], m[1, 3], m[2, 3], m[3, 3],
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diff changeset
362 ])
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diff changeset
363
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364 func translate2d*[T](x, y: T): TMat3[T] = TMat3[T](data: [
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365 T(1), T(0), x,
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366 T(0), T(1), y,
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367 T(0), T(0), T(1),
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368 ])
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369 func scale2d*[T](sx, sy: T): TMat3[T] = TMat3[T](data: [
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370 sx, T(0), T(0),
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371 T(0), sy, T(0),
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372 T(0), T(0), T(1),
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373 ])
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374 func rotate2d*[T](angle: T): TMat3[T] = TMat3[T](data: [
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375 cos(angle), -sin(angle), T(0),
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376 sin(angle), cos(angle), T(0),
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377 T(0), T(0), T(1),
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378 ])
901
7f430850e587 add: helpers for screen-aspect/perspective matrix generating, auto-formatting was done
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379 func translate*(x = 0'f32, y = 0'f32, z = 0'f32): TMat4[float32] = Mat4(data: [
840
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380 1'f32, 0'f32, 0'f32, x,
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381 0'f32, 1'f32, 0'f32, y,
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Sam <sam@basx.dev>
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382 0'f32, 0'f32, 1'f32, z,
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Sam <sam@basx.dev>
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383 0'f32, 0'f32, 0'f32, 1'f32,
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Sam <sam@basx.dev>
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diff changeset
384 ])
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385 func translate*[T: TVec3](v: T): TMat4[float32] = translate(v[0], v[1], v[2])
901
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386 func scale*(x = 1'f32, y = 1'f32, z = 1'f32): Mat4 = Mat4(data: [
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387 x, 0'f32, 0'f32, 0'f32,
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diff changeset
388 0'f32, y, 0'f32, 0'f32,
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parents: 840
diff changeset
389 0'f32, 0'f32, z, 0'f32,
840
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Sam <sam@basx.dev>
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diff changeset
390 0'f32, 0'f32, 0'f32, 1'f32,
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Sam <sam@basx.dev>
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diff changeset
391 ])
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Sam <sam@basx.dev>
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392 func scale*[T: TVec3](v: T): TMat4[float32] = scale(v[0], v[1], v[2])
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393 func rotate*(angle: float32, a: Vec3f): Mat4 =
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Sam <sam@basx.dev>
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diff changeset
394 let
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Sam <sam@basx.dev>
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395 cosa = cos(angle)
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Sam <sam@basx.dev>
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396 sina = sin(angle)
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397 x = a[0]
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398 y = a[1]
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399 z = a[2]
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Sam <sam@basx.dev>
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400 Mat4(data: [
901
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diff changeset
401 x * x * (1 - cosa) + cosa, y * x * (1 - cosa) - z * sina, z * x * (1 - cosa) + y * sina, 0'f32,
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diff changeset
402 x * y * (1 - cosa) + z * sina, y * y * (1 - cosa) + cosa, z * y * (1 - cosa) - x * sina, 0'f32,
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diff changeset
403 x * z * (1 - cosa) - y * sina, y * z * (1 - cosa) + x * sina, z * z * (1 - cosa) + cosa, 0'f32,
7f430850e587 add: helpers for screen-aspect/perspective matrix generating, auto-formatting was done
Sam <sam@basx.dev>
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diff changeset
404 0'f32, 0'f32, 0'f32, 1'f32,
840
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
405 ])
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
406
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
407 func asMat3(m: Mat4): auto =
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
408 Mat3(data: [
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
409 m[0, 0], m[0, 1], m[0, 2],
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
410 m[1, 0], m[1, 1], m[1, 2],
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
411 m[2, 0], m[2, 1], m[2, 2],
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
412 ])
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
413
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
414
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
415 func inversed*(m: Mat4): Mat4 =
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Sam <sam@basx.dev>
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diff changeset
416 var m3 = m.asMat3.transposed
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
417 m3[0, 0] = 1'f32 / m3[0, 0]
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
418 m3[1, 1] = 1'f32 / m3[1, 1]
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
419 m3[2, 2] = 1'f32 / m3[2, 2]
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
420 let col3 = -(m3 * m.col(3).xyz)
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
421 return Mat4(data: [
901
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diff changeset
422 m3[0, 0], m3[0, 1], m3[0, 2], col3.x,
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diff changeset
423 m3[1, 0], m3[1, 1], m3[1, 2], col3.y,
7f430850e587 add: helpers for screen-aspect/perspective matrix generating, auto-formatting was done
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parents: 840
diff changeset
424 m3[2, 0], m3[2, 1], m3[2, 2], col3.z,
7f430850e587 add: helpers for screen-aspect/perspective matrix generating, auto-formatting was done
Sam <sam@basx.dev>
parents: 840
diff changeset
425 0, 0, 0, 1,
840
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
426 ])
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
427
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
parents:
diff changeset
428
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
429 # call e.g. TMat32[int]().randomized() to get a random matrix
44ec744fbedc did: package restructuring according to nimble recommendation for libraries
Sam <sam@basx.dev>
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diff changeset
430 template makeRandomInit(mattype: typedesc) =
901
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diff changeset
431 proc randomized*[T: SomeInteger](m: mattype[T]): mattype[T] =
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diff changeset
432 for i in 0 ..< result.data.len:
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433 result.data[i] = rand(low(typeof(m.data[0])) .. high(typeof(m.data[0])))
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434 proc randomized*[T: SomeFloat](m: mattype[T]): mattype[T] =
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435 for i in 0 ..< result.data.len:
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436 result.data[i] = rand(T(1.0))
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437
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438 makeRandomInit(TMat2)
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439 makeRandomInit(TMat23)
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440 makeRandomInit(TMat32)
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441 makeRandomInit(TMat3)
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442 makeRandomInit(TMat34)
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443 makeRandomInit(TMat43)
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444 makeRandomInit(TMat4)
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445
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446 func perspective*(fovy, aspect, zNear, zFar: float32): Mat4 =
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447 let tanHalfFovy = tan(fovy / 2)
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448 return Mat4(data: [
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449 1 / (aspect * tanHalfFovy), 0, 0, 0,
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450 0, 1 / tanHalfFovy, 0, 0,
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451 0, 0, zFar / (zFar - zNear), -(zFar * zNear) / (zFar - zNear),
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452 0, 0, 1, 1,
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453 ])
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454
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455 func ortho*(left, right, top, bottom, zNear, zFar: float32): Mat4 =
901
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456 Mat4(data: [
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457 2 / (right - left), 0, 0, -(right + left) / (right - left),
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458 0, 2 / (bottom - top), 0, -(bottom + top) / (bottom - top),
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459 0, 0, 1 / (zFar - zNear), -zNear / (zFar - zNear),
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460 0, 0, 1, 1,
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461 ])
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462
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463 # create an orthographic perspective that will map from -1 .. 1 on all axis and keep a 1:1 aspect ratio
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464 # the smaller dimension (width or height) will always be 1 and the larger dimension will be larger, to keep the ratio
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465 func orthoWindowAspect*(windowAspect: float32): Mat4 =
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466 if windowAspect < 1:
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467 let space = 2 * (1 / windowAspect - 1) / 2
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468 ortho(-1, 1, -1 - space, 1 + space, 0, 1)
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469 else:
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470 let space = 2 * (windowAspect - 1) / 2
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471 ortho(-1 - space, 1 + space, -1, 1, 0, 1)
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472
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473 func position*(mat: Mat4): Vec3f =
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474 mat.col(3).toVec3
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475
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476 func scaling*(mat: Mat4): Vec3f =
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477 newVec3f(mat[0, 0], mat[1, 1], mat[2, 2])