700 lines
14 KiB
NASM
700 lines
14 KiB
NASM
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;---------------------------Module-Header------------------------------;
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; Module Name: span.asm
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;
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; Created: 2/3/94
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; Author: Otto Berkes [ottob]
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;
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; Get serious about drawing scanlines.
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;
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; Copyright (c) 1994 Microsoft Corporation
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;----------------------------------------------------------------------;
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.386
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.model small,c
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assume cs:FLAT,ds:FLAT,es:FLAT,ss:FLAT
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assume fs:nothing,gs:nothing
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.xlist
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include gli386.inc
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.list
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.data
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NOP_CODE = 090h ;nop
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JMP_CODE = 0EBh ;short jump
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;; 4x4 (Bayer) dither matrix (Foley & van Dam 13.15) biased for
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;; fractional values between 0 and 0ffh
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Dither_4x4 dd 0008020a0h
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dd 0c040e060h
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dd 030b01090h
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dd 0f070d050h
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.code
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;; Z-test function opcodes. The assembled operands required for the
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;; selected z-comparison are inserted into the loaded span routine
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ztest_fail_functions_short::
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psZtest_never:
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db 2 dup (NOP_CODE)
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psZtest_l:
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jb short @target
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psZtest_e:
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je short @target
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psZtest_le:
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jbe short @target
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psZtest_g:
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ja short @target
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psZtest_ne:
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jne short @target
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psZtest_ge:
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jae short @target
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psZtest_always:
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jmp short $+2
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ztest_pass_functions_short::
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fsZtest_never:
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db 2 dup (NOP_CODE)
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fsZtest_ge:
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jae short @target
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fsZtest_ne:
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jne short @target
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fsZtest_g:
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ja short @target
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fsZtest_le:
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jbe short @target
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fsZtest_e:
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je short @target
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fsZtest_l:
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jb short @target
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fsZtest_always:
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jmp short $+2
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@target:
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ztest_fail_functions::
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pZtest_never:
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db 6 dup (NOP_CODE)
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pZtest_l:
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jb near ptr @target
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pZtest_e:
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je near ptr @target
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pZtest_le:
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jbe near ptr @target
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pZtest_g:
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ja near ptr @target
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pZtest_ne:
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jne near ptr @target
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pZtest_ge:
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jae near ptr @target
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pZtest_always:
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jmp $+6
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ztest_pass_functions::
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fZtest_never:
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db 6 dup (NOP_CODE)
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fZtest_ge:
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jae near ptr @target
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fZtest_ne:
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jne near ptr @target
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fZtest_g:
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ja near ptr @target
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fZtest_le:
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jbe near ptr @target
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fZtest_e:
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je near ptr @target
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fZtest_l:
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jb near ptr @target
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fZtest_always:
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jmp $+6
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;----------------------------------------------------------------------
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; int __fastProcsSize
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;
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; Returns size needed for function/data storage. This could be done as
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; a global...
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;----------------------------------------------------------------------
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__fastProcsSize PROC
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mov eax, size __FASTFUNCSINTERNAL
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ret
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__fastProcsSize ENDP
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;----------------------------------------------------------------------
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; __fastDepthTestSpan
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;
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; Run the z interpolation for the supplied span.
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;----------------------------------------------------------------------
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zspan_begin::
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__fastDepthTestSpan PROC uses ebx edx esi edi, GLCONTEXT: ptr
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LOCAL deltazx: dword
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LOCAL scan_len: dword
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LOCAL scan_len_org: dword
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LOCAL mask_addr: dword
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mov esi, GLCONTEXT
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mov edi, [esi].CTX_polygon.POLY_shader.SHADE_zbuf ; edi points to z-buffer
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mov eax, [esi].CTX_polygon.POLY_shader.SHADE_spanLength
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mov scan_len, eax
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mov scan_len_org, eax
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mov eax, [esi].CTX_polygon.POLY_shader.SHADE_dzdx
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mov deltazx, eax
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mov eax, [esi].CTX_polygon.POLY_shader.SHADE_stipplePat
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mov mask_addr, eax
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; eax is initial z value
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mov eax, [esi].CTX_polygon.POLY_shader.SHADE_frag.FRAG_z
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xor esi, esi ; esi maintains "fail" count
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align 4
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z_loop:
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mov ecx, scan_len
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sub scan_len, 32
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test ecx, ecx
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jle z_done
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cmp ecx, 32
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jle short small_zfrag
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mov ecx, 32
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small_zfrag:
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;; alternative for above?
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;; mov eax, 32 ; ecx = min(ecx-1, 31)
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;; cmp eax, ecx
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;; sbb ah, 0
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;; dec ecx
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;; or cl, ch
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;; and ecx, 01fh
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mov edx, 07fffffffh ; mask bit
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mov ebx, -1 ; initial mask value is all 1's
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align 4
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zrep_pass: ; case for test pass
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cmp eax, [edi]
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zspan_pass_op::
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jae short zcmp_fail_r1
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zspan_write::
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zcmp_pass_r1:
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mov [edi],eax
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add eax, deltazx
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add edi, __GlzValueSize
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ror edx, 1
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dec ecx
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jg short zrep_pass
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mov ecx, mask_addr
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mov [ecx], ebx
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add ecx, 4
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mov mask_addr, ecx
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jmp short z_loop
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align 4
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zrep_fail: ; case for test fail
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cmp eax, [edi]
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zspan_fail_op::
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jb short zcmp_pass_r1
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zcmp_fail_r1:
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add eax, deltazx
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and ebx, edx
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inc esi ; increment fail count
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add edi, __GLzValueSize
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ror edx, 1
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dec ecx
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jg short zrep_fail
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mov ecx, mask_addr
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mov [ecx], ebx
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add ecx, 4
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mov mask_addr, ecx
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jmp short z_loop
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z_done:
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xor eax, eax
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cmp esi, 0
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jne z_fails
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ret
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z_fails:
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inc eax
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xor ebx, ebx
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cmp esi, scan_len_org
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jne z_fails_some
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mov esi, GLCONTEXT
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mov dword ptr [esi].CTX_polygon.POLY_shader.SHADE_done, 1
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z_fails_some:
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ret
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__fastDepthTestSpan ENDP
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zspan_end::
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XOFS MACRO target
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mov edi, funcAddr
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add edi, offset target - offset zspan_begin
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ENDM
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;----------------------------------------------------------------------
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; __fastDepthTestSpanSetup(GLCONTEXT *)
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;
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; Copy the span depth-test span routine from the template and modify it
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; to reflect the current z mode.
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;----------------------------------------------------------------------
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__fastDepthTestSpanSetup PROC uses ebx edx esi edi, GLCONTEXT: ptr
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LOCAL funcAddr: dword
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mov edi, GLCONTEXT
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mov edi, [edi].GENCTX_pPrivateArea
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add edi, __spanZFunc
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mov funcAddr, edi
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mov esi, offset __fastDepthTestSpan
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mov ecx, (zspan_end - zspan_begin + 3) / 4
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rep movsd
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mov esi, GLCONTEXT
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mov edx, [esi].CTX_drawBuffer
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;; z-test conditions
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mov ebx, [esi].CTX_state.ATTR_depth.DEPTH_testFunc
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and ebx, 3
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add ebx, ebx ; 2 bytes/short jump
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;; z-test pass condition
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mov al, byte ptr ztest_pass_functions_short[ebx]
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XOFS zspan_pass_op
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mov [edi], al
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;; z-test fail condition
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mov al, byte ptr ztest_fail_functions_short[ebx]
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XOFS zspan_fail_op
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mov [edi], al
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;; z write-enable
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test dword ptr [esi].CTX_state.ATTR_depth.DEPTH_writeEnable, 1
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jne @zwriteEnabled
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XOFS zspan_write
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mov byte ptr [edi], NOP_CODE
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mov byte ptr [edi]+1, NOP_CODE
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mov eax, funcAddr
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@zwriteEnabled:
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ret
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__fastDepthTestSpanSetup ENDP
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;----------------------------------------------------------------------
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; __fastDeltaSpan(GLCONTEXT *)
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;
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; Set up the scan x delta values for subsequent spans.
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;----------------------------------------------------------------------
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__fastDeltaSpan PROC uses ebx esi edi, GLCONTEXT: ptr, SCANDELTA: ptr
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mov esi, GLCONTEXT
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mov ebx, [esi].CTX_polygon.POLY_shader.SHADE_modeFlags
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mov edi, [esi].GENCTX_pPrivateArea
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mov edi, [edi]
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mov esi, SCANDELTA
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test ebx, __GL_SHADE_RGB
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jne @doRGB
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mov eax, __spanFlatFunc
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test ebx, __GL_SHADE_SMOOTH
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je @flatI
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mov ecx, [esi].SPANREC_r
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mov [edi].FASTFUNCS_spanDelta.SPANREC_r, ecx
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cmp ecx, 0
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je @flatI
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mov eax, __spanSmoothFunc
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@flatI:
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mov ecx, [esi].SPANREC_z
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mov [edi].FASTFUNCS_spanDelta.SPANREC_z, ecx
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mov esi, GLCONTEXT
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add eax, [esi].GENCTX_pPrivateArea
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mov [edi].FASTFUNCS_fastSpanFuncPtr, eax
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ret
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@doRGB:
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mov eax, __spanFlatFunc
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test ebx, __GL_SHADE_SMOOTH
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je @flatRGB
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mov ecx, [esi].SPANREC_r
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mov edx, ecx
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mov [edi].FASTFUNCS_spanDelta.SPANREC_r, ecx
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mov ecx, [esi].SPANREC_g
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or edx, ecx
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mov [edi].FASTFUNCS_spanDelta.SPANREC_g, ecx
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mov ecx, [esi].SPANREC_b
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or edx, ecx
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mov [edi].FASTFUNCS_spanDelta.SPANREC_b, ecx
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je @flatRGB
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mov eax, offset __spanSmoothFunc
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@flatRGB:
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mov ecx, [esi].SPANREC_z
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mov [edi].FASTFUNCS_spanDelta.SPANREC_z, ecx
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mov esi, GLCONTEXT
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add eax, [esi].GENCTX_pPrivateArea
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mov [edi].FASTFUNCS_fastSpanFuncPtr, eax
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ret
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__fastDeltaSpan ENDP
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;======================================================================
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; Smooth-shaded dithered RGB spans.
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;======================================================================
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PROCNAME MACRO name
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__fastRGB&name
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ENDM
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XNAME MACRO name
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pix_ssrgb_&name
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ENDM
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COPYPROC MACRO
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mov edi, GLCONTEXT
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mov edi, [edi].GENCTX_pPrivateArea
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add edi, __spanSmoothFunc
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mov funcAddr, edi
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mov esi, offset __fastRGBSmoothSpan
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mov ecx, (pix_ssrgb_end - pix_ssrgb_begin + 3) / 4
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rep movsd
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ENDM
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;;Macro to compute relative offset between a base and target
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XOFS MACRO target
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mov edi, funcAddr
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add edi, offset pix_ssrgb_&target - offset pix_ssrgb_begin
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;; Note: the assembler produces an error if we try to combine the
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;; above into a single operation due to "mismatched segments". Arg!
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ENDM
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DITHER = 1
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RGBMODE = 1
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;=================
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INCLUDE span_s.asm
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;=================
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;======================================================================
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; Flat-shaded dithered RGB spans.
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;======================================================================
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PROCNAME MACRO name
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__fastRGB&name
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|
|
ENDM
|
||
|
|
|
||
|
|
XNAME MACRO name
|
||
|
|
pix_fsrgb_&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
COPYPROC MACRO
|
||
|
|
mov edi, GLCONTEXT
|
||
|
|
mov edi, [edi].GENCTX_pPrivateArea
|
||
|
|
add edi, __spanFlatFunc
|
||
|
|
mov funcAddr, edi
|
||
|
|
mov esi, offset __fastRGBFlatSpan
|
||
|
|
mov ecx, (pix_fsrgb_end - pix_fsrgb_begin + 3) / 4
|
||
|
|
rep movsd
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
;;Macro to compute relative offset between a base and target
|
||
|
|
|
||
|
|
XOFS MACRO target
|
||
|
|
mov edi, funcAddr
|
||
|
|
add edi, offset pix_fsrgb_&target - offset pix_fsrgb_begin
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
DITHER = 1
|
||
|
|
RGBMODE = 1
|
||
|
|
|
||
|
|
;=================
|
||
|
|
INCLUDE span_f.asm
|
||
|
|
;=================
|
||
|
|
|
||
|
|
|
||
|
|
;======================================================================
|
||
|
|
; Smooth-shaded dithered CI spans.
|
||
|
|
;======================================================================
|
||
|
|
|
||
|
|
|
||
|
|
PROCNAME MACRO name
|
||
|
|
__fastCI&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
XNAME MACRO name
|
||
|
|
pix_ssci_&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
COPYPROC MACRO
|
||
|
|
mov edi, GLCONTEXT
|
||
|
|
mov edi, [edi].GENCTX_pPrivateArea
|
||
|
|
add edi, __spanSmoothFunc
|
||
|
|
mov funcAddr, edi
|
||
|
|
mov esi, offset __fastCISmoothSpan
|
||
|
|
mov ecx, (pix_ssci_end - pix_ssci_begin + 3) / 4
|
||
|
|
rep movsd
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
;;Macro to compute relative offset between a base and target
|
||
|
|
|
||
|
|
XOFS MACRO target
|
||
|
|
mov edi, funcAddr
|
||
|
|
add edi, offset pix_ssci_&target - offset pix_ssci_begin
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
DITHER = 1
|
||
|
|
RGBMODE = 0
|
||
|
|
|
||
|
|
;=================
|
||
|
|
INCLUDE span_s.asm
|
||
|
|
;=================
|
||
|
|
|
||
|
|
|
||
|
|
;======================================================================
|
||
|
|
; Flat-shaded dithered CI spans.
|
||
|
|
;======================================================================
|
||
|
|
|
||
|
|
|
||
|
|
PROCNAME MACRO name
|
||
|
|
__fastCI&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
XNAME MACRO name
|
||
|
|
pix_fsci_&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
COPYPROC MACRO
|
||
|
|
mov edi, GLCONTEXT
|
||
|
|
mov edi, [edi].GENCTX_pPrivateArea
|
||
|
|
add edi, __spanFlatFunc
|
||
|
|
mov funcAddr, edi
|
||
|
|
mov esi, offset __fastCIFlatSpan
|
||
|
|
mov ecx, (pix_fsci_end - pix_fsci_begin + 3) / 4
|
||
|
|
rep movsd
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
;;Macro to compute relative offset between a base and target
|
||
|
|
|
||
|
|
XOFS MACRO target
|
||
|
|
mov edi, funcAddr
|
||
|
|
add edi, offset pix_fsci_&target - offset pix_fsci_begin
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
DITHER = 1
|
||
|
|
RGBMODE = 0
|
||
|
|
|
||
|
|
;=================
|
||
|
|
INCLUDE span_f.asm
|
||
|
|
;=================
|
||
|
|
|
||
|
|
|
||
|
|
;======================================================================
|
||
|
|
;======================================================================
|
||
|
|
;
|
||
|
|
; Non-dithered routines
|
||
|
|
;
|
||
|
|
;======================================================================
|
||
|
|
;======================================================================
|
||
|
|
|
||
|
|
|
||
|
|
;======================================================================
|
||
|
|
; Smooth-shaded non-dithered RGB spans.
|
||
|
|
;======================================================================
|
||
|
|
|
||
|
|
|
||
|
|
PROCNAME MACRO name
|
||
|
|
__fastRGBND&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
XNAME MACRO name
|
||
|
|
pix_ssrgbnd_&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
COPYPROC MACRO
|
||
|
|
mov edi, GLCONTEXT
|
||
|
|
mov edi, [edi].GENCTX_pPrivateArea
|
||
|
|
add edi, __spanSmoothFunc
|
||
|
|
mov funcAddr, edi
|
||
|
|
mov esi, offset __fastRGBNDSmoothSpan
|
||
|
|
mov ecx, (pix_ssrgbnd_end - pix_ssrgbnd_begin + 3) / 4
|
||
|
|
rep movsd
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
;;Macro to compute relative offset between a base and target
|
||
|
|
|
||
|
|
XOFS MACRO target
|
||
|
|
mov edi, funcAddr
|
||
|
|
add edi, offset pix_ssrgbnd_&target - offset pix_ssrgbnd_begin
|
||
|
|
;; Note: the assembler produces an error if we try to combine the
|
||
|
|
;; above into a single operation due to "mismatched segments". Arg!
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
DITHER = 0
|
||
|
|
RGBMODE = 1
|
||
|
|
|
||
|
|
;=================
|
||
|
|
INCLUDE span_s.asm
|
||
|
|
;=================
|
||
|
|
|
||
|
|
|
||
|
|
;======================================================================
|
||
|
|
; Flat-shaded non-dithered RGB spans.
|
||
|
|
;======================================================================
|
||
|
|
|
||
|
|
|
||
|
|
PROCNAME MACRO name
|
||
|
|
__fastRGBND&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
XNAME MACRO name
|
||
|
|
pix_fsrgbnd_&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
COPYPROC MACRO
|
||
|
|
mov edi, GLCONTEXT
|
||
|
|
mov edi, [edi].GENCTX_pPrivateArea
|
||
|
|
add edi, __spanFlatFunc
|
||
|
|
mov funcAddr, edi
|
||
|
|
mov esi, offset __fastRGBNDFlatSpan
|
||
|
|
mov ecx, (pix_fsrgbnd_end - pix_fsrgbnd_begin + 3) / 4
|
||
|
|
rep movsd
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
;;Macro to compute relative offset between a base and target
|
||
|
|
|
||
|
|
XOFS MACRO target
|
||
|
|
mov edi, funcAddr
|
||
|
|
add edi, offset pix_fsrgbnd_&target - offset pix_fsrgbnd_begin
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
DITHER = 0
|
||
|
|
RGBMODE = 1
|
||
|
|
|
||
|
|
;=================
|
||
|
|
INCLUDE span_f.asm
|
||
|
|
;=================
|
||
|
|
|
||
|
|
|
||
|
|
;======================================================================
|
||
|
|
; Smooth-shaded non-dithered CI spans.
|
||
|
|
;======================================================================
|
||
|
|
|
||
|
|
|
||
|
|
PROCNAME MACRO name
|
||
|
|
__fastCIND&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
XNAME MACRO name
|
||
|
|
pix_sscind_&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
COPYPROC MACRO
|
||
|
|
mov edi, GLCONTEXT
|
||
|
|
mov edi, [edi].GENCTX_pPrivateArea
|
||
|
|
add edi, __spanSmoothFunc
|
||
|
|
mov funcAddr, edi
|
||
|
|
mov esi, offset __fastCINDSmoothSpan
|
||
|
|
mov ecx, (pix_sscind_end - pix_sscind_begin + 3) / 4
|
||
|
|
rep movsd
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
;;Macro to compute relative offset between a base and target
|
||
|
|
|
||
|
|
XOFS MACRO target
|
||
|
|
mov edi, funcAddr
|
||
|
|
add edi, offset pix_sscind_&target - offset pix_sscind_begin
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
DITHER = 0
|
||
|
|
RGBMODE = 0
|
||
|
|
|
||
|
|
;=================
|
||
|
|
INCLUDE span_s.asm
|
||
|
|
;=================
|
||
|
|
|
||
|
|
|
||
|
|
;======================================================================
|
||
|
|
; Flat-shaded non-dithered CI spans.
|
||
|
|
;======================================================================
|
||
|
|
|
||
|
|
|
||
|
|
PROCNAME MACRO name
|
||
|
|
__fastCIND&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
XNAME MACRO name
|
||
|
|
pix_fscind_&name
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
COPYPROC MACRO
|
||
|
|
mov edi, GLCONTEXT
|
||
|
|
mov edi, [edi].GENCTX_pPrivateArea
|
||
|
|
add edi, __spanFlatFunc
|
||
|
|
mov funcAddr, edi
|
||
|
|
mov esi, offset __fastCINDFlatSpan
|
||
|
|
mov ecx, (pix_fscind_end - pix_fscind_begin + 3) / 4
|
||
|
|
rep movsd
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
;;Macro to compute relative offset between a base and target
|
||
|
|
|
||
|
|
XOFS MACRO target
|
||
|
|
mov edi, funcAddr
|
||
|
|
add edi, offset pix_fscind_&target - offset pix_fscind_begin
|
||
|
|
ENDM
|
||
|
|
|
||
|
|
DITHER = 0
|
||
|
|
RGBMODE = 0
|
||
|
|
|
||
|
|
;=================
|
||
|
|
INCLUDE span_f.asm
|
||
|
|
;=================
|
||
|
|
|
||
|
|
|
||
|
|
.data
|
||
|
|
|
||
|
|
|
||
|
|
__FASTFUNCSINTERNAL struct
|
||
|
|
__funcsPtr dd ?
|
||
|
|
align 4
|
||
|
|
__spanZFunc db (zspan_end - zspan_begin + 3) dup (0)
|
||
|
|
align 4
|
||
|
|
__spanSmoothFunc db (pix_ssrgb_end - pix_ssrgb_begin + 3) dup (0)
|
||
|
|
align 4
|
||
|
|
__spanFlatFunc db (pix_fsrgb_end - pix_fsrgb_begin + 3) dup (0)
|
||
|
|
align 4
|
||
|
|
__pad dd ?
|
||
|
|
__FASTFUNCSINTERNAL ENDS
|
||
|
|
|
||
|
|
END
|