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cube: add perspective matrix

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This commit is contained in:
Zack Buhman 2024-09-03 23:26:20 -05:00
parent df31f45fd1
commit a6a18162bf
1 changed files with 26 additions and 8 deletions
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34
arm9/examples/cube.c
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@ -45,14 +45,32 @@ void main()
// load identity matrices
io_registers.a.MTX_MODE = MTX_MODE__matrix_mode__projection;
io_registers.a.MTX_IDENTITY = 0;
// scale everything by 1/2
io_registers.a.MTX_SCALE = (1 << 12) / 2;
io_registers.a.MTX_SCALE = (1 << 12) / 2;
io_registers.a.MTX_SCALE = (1 << 12) / 2;
// scale the x-axis by the ratio of the display height by the display width.
io_registers.a.MTX_SCALE = (192 << 12) / 256;
io_registers.a.MTX_SCALE = 1 << 12;
io_registers.a.MTX_SCALE = 1 << 12;
// load a symmetric perspective matrix, with aspect ratio correction
io_registers.a.MTX_LOAD_4X4 = (192 << 12) / 256;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 1 << 12;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = -(1 << 12);
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = 0;
io_registers.a.MTX_LOAD_4X4 = -(1 << 12);
io_registers.a.MTX_LOAD_4X4 = 0;
// translate the viewpoint
io_registers.a.MTX_TRANS = 0;
io_registers.a.MTX_TRANS = 0;
io_registers.a.MTX_TRANS = -3 << 12;
io_registers.a.MTX_MODE = MTX_MODE__matrix_mode__position;
io_registers.a.MTX_IDENTITY = 0;