如何将asm着色器编译为fxo文件？

Question

我有一个编译的fxo着色器,我正在尝试稍微编辑(只是调整一些常量).

使用fxdis(https://code.google.com/archive/p/fxdis-d3d1x/)我可以反汇编这个着色器,这是输出:

# DXBC chunk  0: RDEF offset 52 size 972
# DXBC chunk  1: ISGN offset 1032 size 80
# DXBC chunk  2: OSGN offset 1120 size 44
# DXBC chunk  3: SHEX offset 1172 size 1592
# DXBC chunk  4: STAT offset 2772 size 148
ps_5_0
dcl_global_flags refactoringAllowed
dcl_constant_buffer cb0[30].xyzw, immediateIndexed
dcl_sampler sampler[0]
dcl_resource_texture2d resource[0]
dcl_resource_texture2d resource[1]
dcl_resource_texture2d resource[2]
dcl_input_ps linear v1.xy
dcl_output o0.xyzw
dcl_temps 5
ne r0.x, l(0, 0, 0, 0), cb0[29].y
mov r1.x, v1.x
add r2.xz, -v1.yyxy, l(1, 0, 1, 0)
eq r0.yzw, cb0[29].yyxz, l(0, 1, 1, 1)
movc r1.y, r0.y, r2.x, v1.y
add r2.y, -r1.y, l(1)
movc r0.xy, r0.xxxx, r2.yzyy, r1.xyxx
sample r1.xyzw, r0.xyxx, resource[1].xyzw, sampler[0]
sample r2.xyzw, r0.xyxx, resource[2].xyzw, sampler[0]
mad r0.xy, r1.zxzz, l(255, 255, 0, 0), r1.wyww
mad r0.xy, r0.xyxx, l(0.0078125, 0.0078125, 0, 0), l(-1, -1, 0, 0)
mul r0.y, r0.y, cb0[28].z
mad r1.x, -r0.x, cb0[28].y, l(1)
add r0.x, r0.x, cb0[28].y
div r0.xy, r0.xyxx, r1.xxxx
ge r1.x, l(1), r0.y
ge r1.y, r0.y, l(-1)
div r0.y, r0.y, cb0[28].x
and r1.x, r1.y, r1.x
ge r1.y, l(1), r0.x
and r1.x, r1.y, r1.x
ge r1.y, r0.x, l(-1)
div r0.x, r0.x, cb0[28].x
add r0.xy, r0.xyxx, l(1, 1, 0, 0)
and r1.x, r1.y, r1.x
and r1.x, r1.x, l(1065353216)
mul r1.y, r0.x, l(0.5)
mad r0.x, -r0.x, l(0.5), l(1)
movc r0.x, r0.z, r1.y, r0.x
add r0.z, -r0.x, l(1)
movc r3.y, r0.w, r0.z, r0.x
mul r3.x, r0.y, l(0.5)
add r3.x, r3.x, l(0.5)
sample r4.xyzw, r3.xyxx, resource[0].xyzw, sampler[0]
mul r1.xyzw, r1.xxxx, r4.xyzw
mul r1.xyzw, r2.xyzw, r1.xyzw
ge r0.x, l(2), r0.y
ge r0.y, r0.y, l(0)
and r0.x, r0.y, r0.x
ge r0.y, r3.y, l(0)
ge r0.z, l(1), r3.y
and r0.x, r0.y, r0.x
and r0.x, r0.z, r0.x
and r0.x, r0.x, l(1065353216)
mul o0.xyzw, r0.xxxx, r1.xyzw
ret

我理解程序集并可以编辑它.问题是,我目前不知道如何将其编译回fxo文件.看来Windows SDK中的fxc.exe不接受asm着色器文件.还是我忽略了什么？

Answer 1

不支持从程序集创建着色器.有旧的DirectX组装工具VSA和PSAShader Model 1.1 - 3.0的旧版DirectX SDK.它们最后是在DirectX SDK(2008年11月)中发布的,远早于寿命终止的DirectX SDK(2010年6月).

此外,对于Shader Model 4.x和5.x,DirectX Runtime将不接受未使用正确哈希签名的着色器blob,因此着色器blob的二进制编辑将无法加载.只有官方HLSL编译器才能为DirectX 10.x或DirectX 11生成有效的着色器blob.

支持Diassembler输出,并在MSDN上记录着色器汇编语言,以便于优化HLSL着色器,调试HLSL编译器本身,以及帮助人们调试应用程序中的着色器.

对于DirectX 12和新的Shader Model 6.x工具,请参阅GitHub