76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
""" This simple Python script can be run to generate
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store_pixel_code.h and store_pixel_table.h, which are a poor man's
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form of generated code to cover the explosion of different blending
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options when storing a pixel into the framebuffer.
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Each different combination of options is compiled to a different
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inner-loop store function. The code in tinyGraphicsStateGuardian.cxx
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will select the appropriate function pointer at draw time. """
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Operands = [
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'zero', 'one',
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'icolor', 'micolor',
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'fcolor', 'mfcolor',
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'ialpha', 'mialpha',
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'falpha', 'mfalpha',
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'ccolor', 'mccolor',
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'calpha', 'mcalpha',
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]
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CodeTable = {
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'zero' : '0',
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'one' : '0x10000',
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'icolor' : 'i',
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'micolor' : '0xffff - i',
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'fcolor' : 'f',
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'mfcolor' : '0xffff - f',
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'ialpha' : 'a',
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'mialpha' : '0xffff - a',
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'falpha' : 'fa',
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'mfalpha' : '0xffff - fa',
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'ccolor' : 'zb->blend_ ## i',
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'mccolor' : '0xffff - zb->blend_ ## i',
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'calpha' : 'zb->blend_a',
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'mcalpha' : '0xffff - zb->blend_a',
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}
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def getFname(op_a, op_b):
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return 'store_pixel_%s_%s' % (op_a, op_b)
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# We write the code that actually instantiates the various
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# pixel-storing functions to store_pixel_code.h.
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code = open('store_pixel_code.h', 'wb')
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print >> code, '/* This file is generated code--do not edit. See store_pixel.py. */'
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print >> code, ''
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# The external reference for the table containing the above function
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# pointers gets written here.
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table = open('store_pixel_table.h', 'wb')
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print >> table, '/* This file is generated code--do not edit. See store_pixel.py. */'
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print >> table, ''
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for op_a in Operands:
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for op_b in Operands:
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fname = getFname(op_a, op_b)
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print >> code, '#define FNAME(name) %s' % (fname)
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print >> code, '#define OP_A(f, i) ((unsigned int)(%s))' % (CodeTable[op_a])
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print >> code, '#define OP_B(f, i) ((unsigned int)(%s))' % (CodeTable[op_eb])
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print >> code, '#include "store_pixel.h"'
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print >> code, ''
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# Now, generate the table of function pointers.
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arraySize = '[%s][%s]' % (len(Operands), len(Operands))
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print >> table, 'extern const ZB_storePixelFunc store_pixel_funcs%s;' % (arraySize)
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print >> code, 'const ZB_storePixelFunc store_pixel_funcs%s = {' % (arraySize)
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for op_a in Operands:
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print >> code, ' {'
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for op_b in Operands:
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fname = getFname(op_a, op_b)
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print >> code, ' %s,' % (fname)
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print >> code, ' },'
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print >> code, '};'
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