Subversion Repositories theia_gpu

`define ONE (32'h1 << `SCALE)

`timescale 1ns / 1ps

`include "aDefinitions.v"

/**********************************************************************************

Theia, Ray Cast Programable graphic Processing Unit.

Copyright (C) 2010  Diego Valverde (diego.valverde.g@gmail.com)

This program is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public License

as published by the Free Software Foundation; either version 2

of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

***********************************************************************************/

/*

I can't synthesize roms, the rom needs to be adapted depending on the

final target silicon.

*/

//--------------------------------------------------------

module ROM

(

        input  wire[`ROM_ADDRESS_WIDTH-1:0]              Address,

        `ifdef DEBUG

        input wire [`MAX_CORES-1:0]            iDebug_CoreID,

        `endif

        output reg [`INSTRUCTION_WIDTH-1:0]              I

);

always @( Address )

begin

                        case (Address)

//Hardcoded stuff :(

`define RAY_INSIDE_BOX                          `R3

`define CURRENT_LIGHT_POS `CREG_FIRST_LIGTH  //TODO: CAHNEG T 

`define CURRENT_LIGHT_DIFFUSE 16'h6

//-----------------------------------------------------------------

`define TAG_PIXELSHADER 16'd278

`define TAG_USERCONSTANTS 16'd276

`define TAG_PSU_UCODE_ADRESS2 16'd248

`define TAG_PSU_UCODE_ADRESS 16'd232

`define LABEL_TCC_EXIT 16'd231

`define TAG_TCC_UCODE_ADDRESS 16'd190

`define LABEL_BIU4 16'd189

`define LABEL_BIU3 16'd179

`define LABEL_BIU2 16'd176

`define LABEL_BIU1 16'd174

`define TAG_BIU_UCODE_ADDRESS 16'd157

`define LABEL_HIT 16'd155

`define LABEL15 16'd153

`define LABEL14 16'd151

`define LABEL13 16'd149

`define LABEL_TEST_XY_PLANE 16'd144

`define LABEL12 16'd142

`define LABEL11 16'd140

`define LABEL10 16'd138

`define LABEL_TEST_XZ_PLANE 16'd132

`define LABEL9 16'd130

`define LABEL8 16'd128

`define LABEL7 16'd126

`define LABEL_TEST_YZ_PLANE 16'd120

`define LABEL_RAY_INSIDE_BOX 16'd117

`define LABEL_ELSEZ 16'd116

`define LABEL6 16'd113

`define LABEL_ELESE_IFZ 16'd109

`define LABEL5 16'd106

`define LABEL_TEST_RAY_Z_ORIGEN 16'd102

`define LABEL_ELSEY 16'd101

`define LABEL4 16'd98

`define LABEL_ELESE_IFY 16'd94

`define LABEL3 16'd91

`define LABEL_TEST_RAY_Y_ORIGEN 16'd87

`define LABEL_ELSEX 16'd86

`define LABEL2 16'd83

`define LABEL_ELSE_IFX 16'd79

`define LABEL1 16'd76

`define LABEL_TEST_RAY_X_ORIGEN 16'd72

`define TAG_AABBIU_UCODE_ADDRESS 16'd69

`define LABEL_ALLDONE 16'd67

`define LABEL_NPG_NEXT_ROW 16'd63

`define TAG_NPG_UCODE_ADDRESS 16'd55

`define TAG_RGU_UCODE_ADDRESS 16'd47

`define TAG_CPPU_UCODE_ADDRESS 16'd44

`define LABEL_IS_NO_HIT 16'd43

`define LABEL_IS_HIT 16'd39

`define TAG_ADRR_MAIN 16'd37

//-------------------------------------------------------------------------

//Default values for some registers after reset

//-------------------------------------------------------------------------

//This is the first code that gets executed after the machine is

//externally configured ie after the MST_I goes from 1 to zero.

//It sets initial values for some of the internal registers

0: I = { `ZERO ,`CREG_LAST_t ,`VOID ,`VOID };

//Set the last 't' to very positive value(500) 

1: I = { `SETX ,`CREG_LAST_t ,32'h1F40000  };

2: I = { `ZERO ,`OREG_PIXEL_COLOR ,`VOID ,`VOID };

3: I = { `COPY ,`CREG_PIXEL_2D_POSITION ,`CREG_PIXEL_2D_INITIAL_POSITION ,`VOID };

//Calculate the initial linear address for ADR_O

//this is: (X_initial + RESOLUTION_Y*Y_intial) * 3.

//Notice that we need to use 'unscaled' ie. integer

//values because the resuts of the multiplication by

//the resoluction is to large to fit a fixed point 

//representation.

4: I = { `COPY ,`R1 ,`CREG_RESOLUTION ,`VOID };

5: I = { `UNSCALE ,`R1 ,`R1 ,`VOID };

6: I = { `SETX ,`R1 ,32'h1  };

7: I = { `SETZ ,`R1 ,32'h0  };

8: I = { `COPY ,`R2 ,`CREG_PIXEL_2D_INITIAL_POSITION ,`VOID };

9: I = { `UNSCALE ,`R2 ,`R2 ,`VOID };

//Ok lets start by calculating RESOLUTION_Y*Y_intial

10: I = { `IMUL ,`R1 ,`R1 ,`R2 };

11: I = { `COPY ,`R2 ,`R1 ,`VOID };

12: I = { `SWIZZLE3D ,`R2 ,`SWIZZLE_YYY  };

//now X_initial + RESOLUTION_Y*Y_intial

13: I = { `ADD ,`R3 ,`R1 ,`R2 };

14: I = { `COPY ,`R2 ,`R1 ,`VOID };

15: I = { `SWIZZLE3D ,`R2 ,`SWIZZLE_ZZZ  };

16: I = { `ADD ,`R3 ,`R3 ,`R2 };

17: I = { `SWIZZLE3D ,`R3 ,`SWIZZLE_XXX  };

//finally multiply by 3 to get:

//(X_initial + RESOLUTION_Y*Y_intial) * 3 voila!

18: I = { `SETX ,`R2 ,32'h3  };

19: I = { `SWIZZLE3D ,`R2 ,`SWIZZLE_XXX  };

20: I = { `IMUL ,`CREG_PIXEL_PITCH ,`R3 ,`R2 };

//By this point you should be wondering why not

//just do DOT R1 [1 Resolution_Y 0] [X_intial Y_intial 0 ]?

//well because DOT uses fixed point and the result may not

//fit :(

//Transform from fixed point to integer

//UNSCALE CREG_PIXEL_PITCH CREG_PIXEL_PITCH VOID

21: I = { `COPY ,`OREG_ADDR_O ,`CREG_PIXEL_PITCH ,`VOID };

22: I = { `SETX ,`CREG_3 ,32'h3  };

23: I = { `SWIZZLE3D ,`CREG_3 ,`SWIZZLE_XXX  };

24: I = { `SETX ,`CREG_012 ,32'h0  };

25: I = { `SETY ,`CREG_012 ,32'h1  };

26: I = { `SETZ ,`CREG_012 ,32'h2  };

27: I = { `COPY ,`CREG_CURRENT_OUTPUT_PIXEL ,`CREG_012 ,`VOID };

28: I = { `ZERO ,`CREG_TEXTURE_COLOR ,`VOID ,`VOID };

29: I = { `ZERO ,`CREG_ZERO ,`VOID ,`VOID };

30: I = { `ZERO ,`R1 ,`VOID ,`VOID };

31: I = { `ZERO ,`R2 ,`VOID ,`VOID };

32: I = { `ZERO ,`R3 ,`VOID ,`VOID };

33: I = { `ZERO ,`R4 ,`VOID ,`VOID };

34: I = { `ZERO ,`R5 ,`VOID ,`VOID };

35: I = { `ZERO ,`R99 ,`VOID ,`VOID };

36: I = { `RETURN ,`RT_TRUE   };

//----------------------------------------------

//TAG_ADRR_MAIN:

37: I = { `CALL ,`ENTRYPOINT_ADRR_BIU ,`VOID ,`VOID };

38: I = { `JEQX ,`LABEL_IS_NO_HIT ,`R99 ,`CREG_ZERO };

//LABEL_IS_HIT:

39: I = { `CALL ,`ENTRYPOINT_ADRR_TCC ,`VOID ,`VOID };

40: I = { `NOP ,`RT_FALSE   };

41: I = { `RETURN ,`RT_TRUE   };

42: I = { `NOP ,`RT_FALSE   };

//LABEL_IS_NO_HIT:

43: I = { `RETURN ,`RT_FALSE   };

//----------------------------------------------------------------------          

//Micro code for CPPU

//TAG_CPPU_UCODE_ADDRESS:

44: I = { `SUB ,`R1 ,`CREG_PROJECTION_WINDOW_MAX ,`CREG_PROJECTION_WINDOW_MIN };

45: I = { `DIV ,`CREG_PROJECTION_WINDOW_SCALE ,`R1 ,`CREG_RESOLUTION };

46: I = { `RETURN ,`RT_FALSE   };

//----------------------------------------------------------------------          

//Micro code for RGU

//TAG_RGU_UCODE_ADDRESS:

47: I = { `MUL ,`R1 ,`CREG_PIXEL_2D_POSITION ,`CREG_PROJECTION_WINDOW_SCALE };

48: I = { `ADD ,`R1 ,`R1 ,`CREG_PROJECTION_WINDOW_MIN };

49: I = { `SUB ,`CREG_UNORMALIZED_DIRECTION ,`R1 ,`CREG_CAMERA_POSITION };

50: I = { `MAG ,`R2 ,`CREG_UNORMALIZED_DIRECTION ,`VOID };

51: I = { `DIV ,`CREG_RAY_DIRECTION ,`CREG_UNORMALIZED_DIRECTION ,`R2 };

52: I = { `DEC ,`CREG_LAST_COL ,`CREG_PIXEL_2D_FINAL_POSITION ,`VOID };

53: I = { `SETX ,`CREG_LAST_t ,32'h1F40000  };

54: I = { `RETURN ,`RT_FALSE   };

//----------------------------------------------------------------------

//Next Pixel generation Code (NPG)

//TAG_NPG_UCODE_ADDRESS:

55: I = { `ZERO ,`CREG_TEXTURE_COLOR ,`VOID ,`VOID };

56: I = { `SETX ,`CREG_TEXTURE_COLOR ,32'h60000  };

57: I = { `ADD ,`CREG_CURRENT_OUTPUT_PIXEL ,`CREG_CURRENT_OUTPUT_PIXEL ,`CREG_3 };

58: I = { `ADD ,`CREG_PIXEL_PITCH ,`CREG_PIXEL_PITCH ,`CREG_3 };

59: I = { `COPY ,`OREG_ADDR_O ,`CREG_PIXEL_PITCH ,`VOID };

60: I = { `JGEX ,`LABEL_NPG_NEXT_ROW ,`CREG_PIXEL_2D_POSITION ,`CREG_LAST_COL };

61: I = { `INCX ,`CREG_PIXEL_2D_POSITION ,`CREG_PIXEL_2D_POSITION ,`VOID };

62: I = { `RETURN ,`RT_TRUE   };

//LABEL_NPG_NEXT_ROW:

63: I = { `SETX ,`CREG_PIXEL_2D_POSITION ,32'h0  };

64: I = { `INCY ,`CREG_PIXEL_2D_POSITION ,`CREG_PIXEL_2D_POSITION ,`VOID };

65: I = { `JGEY ,`LABEL_ALLDONE ,`CREG_PIXEL_2D_POSITION ,`CREG_PIXEL_2D_FINAL_POSITION };

66: I = { `RETURN ,`RT_TRUE   };

//LABEL_ALLDONE:

67: I = { `NOP ,`VOID ,`VOID  };

68: I = { `RETURN ,`RT_FALSE   };

//----------------------------------------------------------------------

//Micro code for AABBIU

//TAG_AABBIU_UCODE_ADDRESS:

69: I = { `ZERO ,`R3 ,`VOID ,`VOID };

70: I = { `SETX ,`CREG_LAST_t ,32'h1F40000  };

71: I = { `RETURN ,`RT_TRUE   };

//LABEL_TEST_RAY_X_ORIGEN:

72: I = { `JGEX ,`LABEL_ELSE_IFX ,`CREG_CAMERA_POSITION ,`CREG_AABBMIN };

73: I = { `SUB ,`R1 ,`CREG_AABBMIN ,`CREG_CAMERA_POSITION };

74: I = { `JLEX ,`LABEL1 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

75: I = { `RETURN ,`RT_FALSE   };

//LABEL1:

76: I = { `SETX ,`RAY_INSIDE_BOX ,32'd0  };

77: I = { `DIV ,`R6 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

78: I = { `JMP ,`LABEL_TEST_RAY_Y_ORIGEN ,`VOID ,`VOID };

//LABEL_ELSE_IFX:

79: I = { `JLEX ,`LABEL_ELSEX ,`CREG_CAMERA_POSITION ,`CREG_AABBMAX };

80: I = { `SUB ,`R1 ,`CREG_AABBMAX ,`CREG_CAMERA_POSITION };

81: I = { `JGEX ,`LABEL2 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

82: I = { `RETURN ,`RT_FALSE   };

//LABEL2:

83: I = { `SETX ,`RAY_INSIDE_BOX ,32'd0  };

84: I = { `DIV ,`R6 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

85: I = { `JMP ,`LABEL_TEST_RAY_Y_ORIGEN ,`VOID ,`VOID };

//LABEL_ELSEX:

86: I = { `SETX ,`R5 ,32'b1  };

//LABEL_TEST_RAY_Y_ORIGEN:

87: I = { `JGEY ,`LABEL_ELESE_IFY ,`CREG_CAMERA_POSITION ,`CREG_AABBMIN };

88: I = { `SUB ,`R1 ,`CREG_AABBMIN ,`CREG_CAMERA_POSITION };

89: I = { `JLEY ,`LABEL3 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

90: I = { `RETURN ,`RT_FALSE   };

//LABEL3:

91: I = { `SETX ,`RAY_INSIDE_BOX ,32'd0  };

92: I = { `DIV ,`R6 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

93: I = { `JMP ,`LABEL_TEST_RAY_Z_ORIGEN ,`VOID ,`VOID };

//LABEL_ELESE_IFY:

94: I = { `JLEY ,`LABEL_ELSEY ,`CREG_CAMERA_POSITION ,`CREG_AABBMAX };

95: I = { `SUB ,`R1 ,`CREG_AABBMAX ,`CREG_CAMERA_POSITION };

96: I = { `JGEY ,`LABEL4 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

97: I = { `RETURN ,`RT_FALSE   };

//LABEL4:

98: I = { `SETX ,`RAY_INSIDE_BOX ,32'd0  };

99: I = { `DIV ,`R6 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

100: I = { `JMP ,`LABEL_TEST_RAY_Z_ORIGEN ,`VOID ,`VOID };

//LABEL_ELSEY:

101: I = { `SETY ,`R5 ,32'b1  };

//LABEL_TEST_RAY_Z_ORIGEN:

102: I = { `JGEZ ,`LABEL_ELESE_IFZ ,`CREG_CAMERA_POSITION ,`CREG_AABBMIN };

103: I = { `SUB ,`R1 ,`CREG_AABBMIN ,`CREG_CAMERA_POSITION };

104: I = { `JLEZ ,`LABEL5 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

105: I = { `RETURN ,`RT_FALSE   };

//LABEL5:

106: I = { `SETX ,`RAY_INSIDE_BOX ,32'd0  };

107: I = { `DIV ,`R6 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

108: I = { `JMP ,`LABEL_RAY_INSIDE_BOX ,`VOID ,`VOID };

//LABEL_ELESE_IFZ:

109: I = { `JLEZ ,`LABEL_ELSEZ ,`CREG_CAMERA_POSITION ,`CREG_AABBMAX };

110: I = { `SUB ,`R1 ,`CREG_AABBMAX ,`CREG_CAMERA_POSITION };

111: I = { `JGEZ ,`LABEL6 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

112: I = { `RETURN ,`RT_FALSE   };

//LABEL6:

113: I = { `SETX ,`RAY_INSIDE_BOX ,32'd0  };

114: I = { `DIV ,`R6 ,`R1 ,`CREG_UNORMALIZED_DIRECTION };

115: I = { `JMP ,`LABEL_RAY_INSIDE_BOX ,`VOID ,`VOID };

//LABEL_ELSEZ:

116: I = { `SETZ ,`R5 ,32'b1  };

//LABEL_RAY_INSIDE_BOX:

117: I = { `ZERO ,`R1 ,`VOID ,`VOID };

118: I = { `JEQX ,`LABEL_TEST_YZ_PLANE ,`R1 ,`RAY_INSIDE_BOX };

//BUG need a NOP here else pipeline gets confused

119: I = { `RETURN ,`RT_TRUE   };

//LABEL_TEST_YZ_PLANE:

120: I = { `JNEX ,`LABEL_TEST_XZ_PLANE ,`R5 ,`R1 };

121: I = { `SWIZZLE3D ,`R6 ,`SWIZZLE_XXX  };

122: I = { `MUL ,`R2 ,`CREG_UNORMALIZED_DIRECTION ,`R6 };

123: I = { `ADD ,`R2 ,`R2 ,`CREG_CAMERA_POSITION };

124: I = { `JGEY ,`LABEL7 ,`R2 ,`CREG_AABBMIN };

125: I = { `RETURN ,`RT_FALSE   };

//LABEL7:

126: I = { `JLEY ,`LABEL8 ,`R2 ,`CREG_AABBMAX };

127: I = { `RETURN ,`RT_FALSE   };

//LABEL8:

128: I = { `JGEZ ,`LABEL9 ,`R2 ,`CREG_AABBMIN };

129: I = { `RETURN ,`RT_FALSE   };

//LABEL9:

130: I = { `JLEZ ,`LABEL_TEST_XZ_PLANE ,`R2 ,`CREG_AABBMAX };

131: I = { `RETURN ,`RT_FALSE   };

//LABEL_TEST_XZ_PLANE:

132: I = { `JNEY ,`LABEL_TEST_XY_PLANE ,`R5 ,`R1 };

133: I = { `SWIZZLE3D ,`R6 ,`SWIZZLE_YYY  };

134: I = { `MUL ,`R2 ,`CREG_UNORMALIZED_DIRECTION ,`R6 };

135: I = { `ADD ,`R2 ,`R2 ,`CREG_CAMERA_POSITION };

136: I = { `JGEX ,`LABEL10 ,`R2 ,`CREG_AABBMIN };

137: I = { `RETURN ,`RT_FALSE   };

//LABEL10:

138: I = { `JLEX ,`LABEL11 ,`R2 ,`CREG_AABBMAX };

139: I = { `RETURN ,`RT_FALSE   };

//LABEL11:

140: I = { `JGEZ ,`LABEL12 ,`R2 ,`CREG_AABBMIN };

141: I = { `RETURN ,`RT_FALSE   };

//LABEL12:

142: I = { `JLEZ ,`LABEL_TEST_XY_PLANE ,`R2 ,`CREG_AABBMAX };

143: I = { `RETURN ,`RT_FALSE   };

//LABEL_TEST_XY_PLANE:

144: I = { `SWIZZLE3D ,`R6 ,`SWIZZLE_ZZZ  };

145: I = { `MUL ,`R2 ,`CREG_UNORMALIZED_DIRECTION ,`R6 };

146: I = { `ADD ,`R2 ,`R2 ,`CREG_CAMERA_POSITION };

147: I = { `JGEX ,`LABEL13 ,`R2 ,`CREG_AABBMIN };

148: I = { `RETURN ,`RT_FALSE   };

//LABEL13:

149: I = { `JLEX ,`LABEL14 ,`R2 ,`CREG_AABBMAX };

150: I = { `RETURN ,`RT_FALSE   };

//LABEL14:

151: I = { `JGEY ,`LABEL15 ,`R2 ,`CREG_AABBMIN };

152: I = { `RETURN ,`RT_FALSE   };

//LABEL15:

153: I = { `JLEY ,`LABEL_HIT ,`R2 ,`CREG_AABBMAX };

154: I = { `RETURN ,`RT_FALSE   };

//LABEL_HIT:

155: I = { `SETX ,`CREG_LAST_t ,32'h1F40000  };

156: I = { `RETURN ,`RT_TRUE   };

 //------------------------------------------------------------------------

 //BIU Micro code

//TAG_BIU_UCODE_ADDRESS:

157: I = { `ZERO ,`OREG_PIXEL_COLOR ,`VOID ,`VOID };

158: I = { `SETX ,`R3 ,`ONE  };

159: I = { `SETX ,`R1 ,32'h00000  };

160: I = { `SUB ,`CREG_E1 ,`CREG_V1 ,`CREG_V0 };

161: I = { `SUB ,`CREG_E2 ,`CREG_V2 ,`CREG_V0 };

162: I = { `SUB ,`CREG_T ,`CREG_CAMERA_POSITION ,`CREG_V0 };

163: I = { `CROSS ,`CREG_P ,`CREG_RAY_DIRECTION ,`CREG_E2 };

164: I = { `CROSS ,`CREG_Q ,`CREG_T ,`CREG_E1 };

165: I = { `DOT ,`CREG_H1 ,`CREG_Q ,`CREG_E2 };

166: I = { `DOT ,`CREG_H2 ,`CREG_P ,`CREG_T };

167: I = { `DOT ,`CREG_H3 ,`CREG_Q ,`CREG_RAY_DIRECTION };

168: I = { `DOT ,`CREG_DELTA ,`CREG_P ,`CREG_E1 };

169: I = { `DIV ,`CREG_t ,`CREG_H1 ,`CREG_DELTA };

170: I = { `DIV ,`CREG_u ,`CREG_H2 ,`CREG_DELTA };

171: I = { `DIV ,`CREG_v ,`CREG_H3 ,`CREG_DELTA };

172: I = { `JGEX ,`LABEL_BIU1 ,`CREG_u ,`R1 };

173: I = { `RET ,`R99 ,`FALSE  };

//LABEL_BIU1:

174: I = { `JGEX ,`LABEL_BIU2 ,`CREG_v ,`R1 };

175: I = { `RET ,`R99 ,`FALSE  };

//LABEL_BIU2:

176: I = { `ADD ,`R2 ,`CREG_u ,`CREG_v };

177: I = { `JLEX ,`LABEL_BIU3 ,`R2 ,`R3 };

178: I = { `RET ,`R99 ,`FALSE  };

//LABEL_BIU3:

179: I = { `JGEX ,`LABEL_BIU4 ,`CREG_t ,`CREG_LAST_t };

180: I = { `COPY ,`CREG_LAST_t ,`CREG_t ,`VOID };

181: I = { `COPY ,`CREG_LAST_u ,`CREG_u ,`VOID };

182: I = { `COPY ,`CREG_LAST_v ,`CREG_v ,`VOID };

183: I = { `COPY ,`CREG_E1_LAST ,`CREG_E1 ,`VOID };

184: I = { `COPY ,`CREG_E2_LAST ,`CREG_E2 ,`VOID };

185: I = { `COPY ,`CREG_UV0_LAST ,`CREG_UV0 ,`VOID };

186: I = { `COPY ,`CREG_UV1_LAST ,`CREG_UV1 ,`VOID };

187: I = { `COPY ,`CREG_UV2_LAST ,`CREG_UV2 ,`VOID };

188: I = { `COPY ,`CREG_TRI_DIFFUSE_LAST ,`CREG_TRI_DIFFUSE ,`VOID };

//LABEL_BIU4:

189: I = { `RET ,`R99 ,`TRUE  };

//-------------------------------------------------------------------------

//Calculate the adress of the texure coordiantes.

//TAG_TCC_UCODE_ADDRESS:

//Do this calculation only if this triangle is the one closest to the camera

190: I = { `JGX ,`LABEL_TCC_EXIT ,`CREG_t ,`CREG_LAST_t };

//First get the UV coodrinates and store in R1

//R1x: u_coordinate = U0 + last_u * (U1 - U0) + last_v * (U2 - U0)

//R1y: v_coordinate = V0 + last_u * (V1 - V0) + last_v * (V2 - V0)

//R1z: 0

191: I = { `SUB ,`R1 ,`CREG_UV1_LAST ,`CREG_UV0_LAST };

192: I = { `SUB ,`R2 ,`CREG_UV2_LAST ,`CREG_UV0_LAST };

193: I = { `MUL ,`R1 ,`CREG_LAST_u ,`R1 };

194: I = { `MUL ,`R2 ,`CREG_LAST_v ,`R2 };

195: I = { `ADD ,`R1 ,`R1 ,`R2 };

196: I = { `ADD ,`R1 ,`R1 ,`CREG_UV0_LAST };

//R7x : fu = (u_coordinate) * gTexture.mWidth

//R7y : fv = (v_coordinate) * gTexture.mWidth

//R7z : 0

197: I = { `MUL ,`R7 ,`R1 ,`CREG_TEXTURE_SIZE };

//R1x: u1 = ((int)fu) % gTexture.mWidth

//R1y: v1 = ((int)fv) % gTexture.mHeight

//R1z: 0

//R2x: u2 = (u1 + 1 ) % gTexture.mWidth

//R2y: v2 = (v2 + 1 ) % gTexture.mHeight

//R2z: 0

// Notice MOD2 only operates over

// numbers that are power of 2 also notice that the

// textures are assumed to be squares!

//x % 2^n == x & (2^n - 1).

198: I = { `MOD ,`R1 ,`R7 ,`CREG_TEXTURE_SIZE };

199: I = { `INC ,`R2 ,`R1 ,`VOID };

200: I = { `MOD ,`R2 ,`R2 ,`CREG_TEXTURE_SIZE };

//Cool now we should store the values in the appropiate registers

//OREG_TEX_COORD1.x = u1 + v1 * gTexture.mWidth

//OREG_TEX_COORD1.y = u2 + v1 * gTexture.mWidth

//OREG_TEX_COORD1.z = 0

//OREG_TEX_COORD2.x = u1 + v2 * gTexture.mWidth

//OREG_TEX_COORD2.y = u2 + v2 * gTexture.mWidth

//OREG_TEX_COORD1.z = 0

//R1= [u1 v1 0]

//R2= [u2 v2 0]

//R2 = [v2 u2 0]

201: I = { `SWIZZLE3D ,`R2 ,`SWIZZLE_YXZ  };

//R3 = [v2 v1 0]

202: I = { `XCHANGEX ,`R3 ,`R1 ,`R2 };

//R4 = [u1 u2 0]

203: I = { `XCHANGEX ,`R4 ,`R2 ,`R1 };

//R2 = [v2*H v1*H 0]

204: I = { `UNSCALE ,`R9 ,`R3 ,`VOID };

205: I = { `UNSCALE ,`R8 ,`CREG_TEXTURE_SIZE ,`VOID };

206: I = { `IMUL ,`R2 ,`R9 ,`R8 };

//OREG_TEX_COORD1 = [u1 + v2*H u2 + v1*H 0]

//R4 = FixedToIinteger(R4)

207: I = { `UNSCALE ,`R4 ,`R4 ,`VOID };

208: I = { `ADD ,`R12 ,`R2 ,`R4 };

209: I = { `SETX ,`R5 ,32'h3  };

210: I = { `SETY ,`R5 ,32'h3  };

211: I = { `SETZ ,`R5 ,32'h3  };

//Multiply by 3 (the pitch)

//IMUL OREG_TEX_COORD1 R12 R5  

212: I = { `IMUL ,`CREG_TEX_COORD1 ,`R12 ,`R5 };

//R4 = [u2 u1 0]

213: I = { `SWIZZLE3D ,`R4 ,`SWIZZLE_YXZ  };

//OREG_TEX_COORD2 [u2 + v2*H u1 + v1*H 0]

214: I = { `ADD ,`R12 ,`R2 ,`R4 };

//Multiply by 3 (the pitch)

//IMUL OREG_TEX_COORD2 R12 R5  

215: I = { `IMUL ,`CREG_TEX_COORD2 ,`R12 ,`R5 };

//Cool now get the weights

//w1 = (1 - fracu) * (1 - fracv)

//w2 = fracu * (1 - fracv)

//w3 = (1 - fracu) * fracv

//w4 = fracu *  fracv

//R4x: fracu 

//R4y: fracv 

//R4z: 0

216: I = { `FRAC ,`R4 ,`R7 ,`VOID };

//R5x: fracv 

//R5y: fracu 

//R5z: 0 

217: I = { `COPY ,`R5 ,`R4 ,`VOID };

218: I = { `SWIZZLE3D ,`R5 ,`SWIZZLE_YXZ  };

//R5x: 1 - fracv 

//R5y: 1 - fracu 

//R5y: 1

219: I = { `NEG ,`R5 ,`R5 ,`VOID };

220: I = { `INC ,`R5 ,`R5 ,`VOID };

//R5x: 1 - fracv 

//R5y: 1 - fracu 

//R5y: (1 - fracv)(1 - fracu) 

221: I = { `MULP ,`CREG_TEXWEIGHT1 ,`R5 ,`VOID };

//CREG_TEXWEIGHT1.x = (1 - fracv)(1 - fracu) 

//CREG_TEXWEIGHT1.y = (1 - fracv)(1 - fracu) 

//CREG_TEXWEIGHT1.z = (1 - fracv)(1 - fracu) 

222: I = { `SWIZZLE3D ,`CREG_TEXWEIGHT1 ,`SWIZZLE_ZZZ  };

//R6x: w2: fracu * (1 - fracv )

//R6y: w3: fracv * (1 - fracu )

//R6z: 0

223: I = { `MUL ,`R6 ,`R4 ,`R5 };

//CREG_TEXWEIGHT2.x = fracu * (1 - fracv )

//CREG_TEXWEIGHT2.y = fracu * (1 - fracv )

//CREG_TEXWEIGHT2.z = fracu * (1 - fracv )

224: I = { `COPY ,`CREG_TEXWEIGHT2 ,`R6 ,`VOID };

225: I = { `SWIZZLE3D ,`CREG_TEXWEIGHT2 ,`SWIZZLE_XXX  };

//CREG_TEXWEIGHT3.x = fracv * (1 - fracu )

//CREG_TEXWEIGHT3.y = fracv * (1 - fracu )

//CREG_TEXWEIGHT3.z = fracv * (1 - fracu )

226: I = { `COPY ,`CREG_TEXWEIGHT3 ,`R6 ,`VOID };

227: I = { `SWIZZLE3D ,`CREG_TEXWEIGHT3 ,`SWIZZLE_YYY  };

//R4x: fracu

//R4y: fracv

//R4z: fracu * fracv

228: I = { `MULP ,`R4 ,`R4 ,`VOID };

//CREG_TEXWEIGHT4.x = fracv * fracu 

//CREG_TEXWEIGHT4.y = fracv * fracu 

//CREG_TEXWEIGHT4.z = fracv * fracu 

229: I = { `COPY ,`CREG_TEXWEIGHT4 ,`R4 ,`VOID };

230: I = { `SWIZZLE3D ,`CREG_TEXWEIGHT4 ,`SWIZZLE_ZZZ  };