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1 ; ---------------------------------------------------------------------
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2 ;
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3 ;
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4 ; vu1 micro code for basic sample
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5 ;
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6 ;
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7 ; VF01 - VF04 : perspective + transformation matrix
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8 ; VF05 - VF08 : light color matrix
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9 ; VF09 - VF12 : X light vector matrix(3 lighting vector + 1 ambient)
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10 ; VF15 : gif tag
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11 ; VF20 : source vertex
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12 ; VF21 : source normal
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13 ; VF22 : source st
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14 ; VF23 : source color
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15 ;
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16 ;
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17 ; VI00 : 0 (定数レジスタ)
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18 ; VI01 : ポインタ
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19 ; VI02 : pointer for gif tag / for XGKICK
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20 ; VI03 : pointer for vertex
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21 ; VI04 : pointer for normal
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22 ; VI05 : pointer for st
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23 ; VI06 : pointer for color
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24 ; VI07 : store pointer for RGBAQ
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25 ; VI08 : store pointer for ST
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26 ; VI09 : store pointer for XYZF2
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27 ; VI10 : counter for vertices
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28 ;
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29 ; クリッピングの処理に使用します
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30 ; -----------------------------------
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31 ; VI14 : vertex counter
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32 ;
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33 ; VI15 : リンクレジスタ
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34 ;
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35 ; ---------------------------------------------------------------------
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36 NOP IADDIU VI01, VI00, 0
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37 NOP IADDIU VI02, VI00, 4
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38 NOP IADDIU VI03, VI00, 16 ; screen matrix X object matrix
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39 NOP BAL VI15, MulMatrix
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40 NOP NOP
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41
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42 NOP LOI 255.0 ; iレジスタ即値ロード
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43 MULi.w VF16, VF00, I NOP; vf00 (0.0, 0.0, 0.0, 1.0)
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44
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45 ; ------------------------------------------------------------
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46 ; クリッピング用の初期値を設定
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47 ; ------------------------------------------------------------
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48 NOP LOI -2048.0
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49 ADDi.xy VF29,VF00, I NOP
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50 NOP LOI -8388608.0
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51 ADDi.z VF29,VF00, I NOP
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52 ADDw.xy VF30,VF00, VF00 NOP
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53 NOP LOI 0.00012207
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54 ADDi.z VF30,VF00,I NOP
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55 NOP LOI 1024.0
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56 MULi.w VF30,VF00,I NOP
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57 ;------------------------------------------------------------------
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58
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59 NOP IADDIU VI01, VI00, 8
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60 NOP LQI VF09, (VI01++) ; (8) load light color matrix
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61 NOP LQI VF10, (VI01++)
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62 NOP LQI VF11, (VI01++)
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63 NOP LQI VF12, (VI01++)
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64 NOP LQI VF05, (VI01++) ; (12) load light vector matrix
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65 NOP LQI VF06, (VI01++)
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66 NOP LQI VF07, (VI01++)
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67 NOP LQI VF08, (VI01++)
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68 NOP LQI VF01, (VI01++) ; (16) load screen x transformation matrix
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69 NOP LQI VF02, (VI01++)
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70 NOP LQI VF03, (VI01++)
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71 NOP LQI VF04, (VI01++)
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72
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73 NOP IADDIU VI12,VI00,0x7fff ; VI12: 0x7fff
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74 NOP IADDIU VI13,VI12,0x0001 ; VI13: 0x8000
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75
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76 NOP[E] NOP
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77 NOP NOP
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78
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79 START0:
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80 NOP XTOP VI01 ; VI01にVIFのTOPレジスタ値をロード
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81 NOP ILWR.x VI10, (VI01)x ; copy to VI10
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82 NOP IADDIU VI11, VI00, 0x7fff ; set mask
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83 NOP IAND VI10, VI11, VI10 ; mask. VI10 is counter for vertices.
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84 NOP LQ VF19, 0(VI01) ; load gif tag
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85 NOP IADDIU VI03, VI01, 1 ; pointer for vertices
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86 NOP IADD VI04, VI03, VI10 ; pointer for normal
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87 NOP IADD VI05, VI04, VI10 ; pointer for color
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88 NOP IADD VI06, VI05, VI10 ; pointer for st
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89 NOP IADD VI02, VI06, VI10 ; set XGKICK pointer
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90 NOP SQ VF19, 0(VI02) ; store gif tag
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91 NOP IADDIU VI07, VI02, 2 ; set store pointer for RGBAQ
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92 NOP IADDIU VI08, VI02, 1 ; set store pointer for ST
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93 NOP IADDIU VI09, VI02, 3 ; set store pointer for XYZF2
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94 NOP IAND VI14, VI14, VI00 ;
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95 NOP IADDIU VI14, VI00, 3 ; VI14(counter)に3をセット
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96 NOP FCSET 0x000000 ; クリッピングフラグ初期化
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97 LOOP:
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98 NOP LQI VF20, (VI03++) ; load vertex
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99 NOP LQI VF21, (VI04++) ; load normal
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100 NOP LQI VF22, (VI05++) ; load color
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101 NOP LQI VF23, (VI06++) ; load st
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102 ; ------------------------------------------------------------------
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103 ; counter--;
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104 ; if (counter==0) goto CLEAR2 // counter(VI14) は頂点数のカウンタ
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105 ; else goto CLEAR1
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106 ; ------------------------------------------------------------------
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107 NOP IADDI VI14, VI14, -1 ; VI14(counter)をデクリメント
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108 NOP IBEQ VI14, VI00, CLEAR2 ; VI14==0ならCLEAR2:へジャンプ
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109 NOP NOP
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110 NOP B CLEAR1 ;
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111 NOP NOP
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112 CLEAR2:
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113 NOP IADDIU VI14, VI00, 2 ; VI14(counter)を初期化
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114 NOP FCSET 0x000000 ; クリッピングフラグをクリア
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115 ;------------------------------------------------------------------
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116 CLEAR1:
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117
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118 ; --- rotation/translation/perspective transform ---
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119 MULAx.xyzw ACC, VF01, VF20x NOP ; rot/trans/pers
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120 MADDAy.xyzw ACC, VF02, VF20y NOP
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121 MADDAz.xyzw ACC, VF03, VF20z NOP
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122 MADDw.xyzw VF25, VF04, VF20w NOP
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123 NOP NOP
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124 NOP NOP
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125 NOP NOP
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126 NOP DIV Q, VF00w, VF25w
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127
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128 ; --- light matrix X normal ---
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129 MULAx.xyzw ACC, VF05, VF21x NOP ; dot products
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130 MADDAy.xyzw ACC, VF06, VF21y NOP
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131 MADDAz.xyzw ACC, VF07, VF21z NOP
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132 MADDw.xyzw VF13, VF08, VF21w NOP
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133 NOP NOP
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134 NOP NOP
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135 NOP NOP
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136 MAXx.xyzw VF13, VF13, VF00x NOP ; cut under 0.0f
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137
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138 ; --- calc transformed position and store it ---
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139 MULq VF28, VF25, Q NOP
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140 NOP NOP
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141 NOP NOP
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142 NOP NOP
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143 FTOI4 VF27, VF28 NOP
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144
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145 ADD VF31,VF28,VF29 NOP
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146 MUL VF31,VF31,VF30 NOP
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147
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148 ; ------------------------------------------------------------------
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149 ; Triangleは3頂点ごとに描画キックするので、3頂点カウンタを設けたい
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150 ; 3頂点の内、どれか1つにでもFCが立てばそれを保持したい
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151 ; ------------------------------------------------------------------
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152 NOP FCAND VI01, 0x03fff ; FCの2回前までの結果をVI01に
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153 NOP IBEQ VI01, VI00, CLIP1 ; (FC==0)ではみ出し無し
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154 NOP NOP
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155 NOP B CLIP0 ;
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156 NOP NOP
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157 CLIP1:
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158 CLIPw VF31,VF30w NOP ; クリッピング検査
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159 NOP NOP
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160 NOP NOP
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161 ; ------------------------------------------------------------------
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162 CLIP0:
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163 ; --- store XYZF2 ---
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164 NOP SQ VF27, 0(VI09)
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165 NOP FCAND VI01,0x03fff
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166 NOP IADDIU VI11,VI01,0x7fff
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167 ; NOP IADDIU VI01, VI00, 0x8000
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168 ; NOP IAND VI11,VI11,VI01
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169 NOP IAND VI11,VI11,VI13
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170 NOP ISW.w VI11,0(VI09)
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171 NOP IADDIU VI09, VI09, 3
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172
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173 ; --- load st and store it ---
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174 MULq.xyz VF27, VF23, Q NOP
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175 NOP NOP
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176 NOP NOP
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177 NOP NOP
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178 NOP SQ VF27, 0(VI08)
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179 NOP IADDIU VI08, VI08, 3
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180 NOP NOP
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181 NOP NOP
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182
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183 ; --- color * dot-product ---
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184 MULAx.xyzw ACC, VF09, VF13x NOP
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185 MADDAy.xyzw ACC, VF10, VF13y NOP
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186 MADDAz.xyzw ACC, VF11, VF13z NOP
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187 MADDw.xyzw VF14, VF12, VF13w NOP
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188 NOP NOP
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189 NOP NOP
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190 NOP NOP
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191 MUL.xyzw VF27, VF22, VF14 NOP
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192 NOP NOP
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193 NOP NOP
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194 NOP NOP
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195 MINI.w VF27, VF27, VF16w NOP
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196 NOP NOP
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197 NOP NOP
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198 NOP NOP
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199 FTOI0 VF26, VF27 NOP
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200 NOP NOP
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201 NOP NOP
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202 NOP NOP
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203 NOP SQ VF26, 0(VI07)
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204 NOP IADDIU VI07, VI07, 3
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205
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206 ; --- decrement loop ---
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207 NOP IADDI VI10, VI10, -1
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208 NOP IBNE VI10, VI00, LOOP
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209
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210 ; --- send result to GIF and stop ---
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211 NOP NOP
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212 NOP XGKICK VI02
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213 NOP[E] NOP
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214 NOP NOP
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215 NOP B START0
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216 NOP NOP ;Take care!! Don't forget.
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217
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218
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219 ; -------------------------------------------------------------------
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220 ; MulMatrix
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221 ; VI01 : address of source matrix
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222 ; VI02 : address of source matrix
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223 ; VI03 : address of destination matrix
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224 ;
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225
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226 MulMatrix:
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227 NOP LQI.xyzw VF08, (VI02++)
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228 NOP LQI.xyzw VF04, (VI01++)
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229 NOP LQI.xyzw VF05, (VI01++)
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230 NOP LQI.xyzw VF06, (VI01++)
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231 NOP LQI.xyzw VF07, (VI01++)
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232 MULAx.xyzw ACC, VF04, VF08x LQI.xyzw VF09, (VI02++)
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233 MADDAy.xyzw ACC, VF05, VF08y NOP
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234 MADDAz.xyzw ACC, VF06, VF08z NOP
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235 MADDw.xyzw VF12, VF07, VF08w NOP
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236 MULAx.xyzw ACC, VF04, VF09x LQI.xyzw VF10, (VI02++)
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237 MADDAy.xyzw ACC, VF05, VF09y NOP
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238 MADDAz.xyzw ACC, VF06, VF09z NOP
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239 MADDw.xyzw VF13, VF07, VF09w SQI.xyzw VF12, (VI03++)
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240 MULAx.xyzw ACC, VF04, VF10x LQI.xyzw VF11, (VI02++)
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241 MADDAy.xyzw ACC, VF05, VF10y NOP
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242 MADDAz.xyzw ACC, VF06, VF10z NOP
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243 MADDw.xyzw VF14, VF07, VF10w SQI.xyzw VF13, (VI03++)
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244 MULAx.xyzw ACC, VF04, VF11x NOP
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245 MADDAy.xyzw ACC, VF05, VF11y NOP
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246 MADDAz.xyzw ACC, VF06, VF11z NOP
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247 MADDw.xyzw VF15, VF07, VF11w SQI.xyzw VF14, (VI03++)
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248 NOP NOP
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249 NOP NOP
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250 NOP NOP
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251 NOP SQI.xyzw VF15, (VI03++)
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252 NOP NOP
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253 NOP JR VI15
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254 NOP NOP
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