高级着色器语言

维基百科,自由的百科全书
跳转至: 导航搜索

高级着色器语言High Level Shader Language,简称HLSL),由微軟擁有及開發的一種語言,只能供微軟的Direct3D以及XNA使用。HLSL是GLSL的先辈,同時不能與OpenGL標準兼容。他跟NvidiaCg非常相似。

HLSL的主要作用為將一些複雜的圖像處理,快速而又有效率地在顯示卡上完成,與組合式或低階Shader Language相比,能降低在編寫複雜特殊效果時所發生編程錯誤的機會。

Shader model 比較[编辑]

Pixel shader 比較[编辑]

Pixel shader 版本 1.0 to 1.3[1] 1.4[1] 2.0[1][2] 2.0a[1][2] 2.0b[1][2] 3.0[1][3] 4.0[4] 4.1[5] 5.0[6]
Dependent texture limit 4 6 8 Unlimited 8 Unlimited Unlimited Unlimited Unlimited
Texture instruction limit 4 6*2 32 Unlimited Unlimited Unlimited Unlimited Unlimited Unlimited
Position register No No No No No Yes Yes Yes Yes
Instruction slots 8+4 8+4 32 + 64 512 512 ≥ 512 ≥ 65536 ≥ 65536 ≥ 65536
Executed instructions 8+4 6*2+8*2 32 + 64 512 512 65536 Unlimited Unlimited Unlimited
Texture indirections 4 4 4 Unlimited 4 Unlimited Unlimited Unlimited Unlimited
Interpolated registers 2 + 8 2 + 8 2 + 8 2 + 8 2 + 8 10 32 32 32
Instruction predication No No No Yes No Yes No No No
Index input registers No No No No No Yes Yes Yes Yes
Temp registers 2 6 12 to 32 22 32 32 4096 4096 4096
Constant registers 8 8 32 32 32 224 16x4096 16x4096 16x4096
Arbitrary swizzling No No No Yes No Yes Yes Yes Yes
Gradient instructions No No No Yes No Yes Yes Yes Yes
Loop count register No No No No No Yes Yes Yes Yes
Face register (2-sided lighting) No No No No No Yes Yes Yes Yes
Dynamic flow control No No No No No 24 Yes Yes Yes
Bitwise Operators No No No No No No Yes Yes Yes
Native Integers No No No No No No Yes Yes Yes
  • PS 2.0 = DirectX 9.0 original Shader Model 2 specification.
  • PS 2.0a = NVIDIA GeForce FX-optimized model.
  • PS 2.0b = ATI Radeon X700, X800, X850 shader model, DirectX 9.0b.
  • PS 3.0 = Shader Model 3.0.
  • PS 4.0 = Shader Model 4.0.
  • PS 4.1 = Shader Model 4.1.
  • PS 5.0 = Shader Model 5.0.

"32 + 64" for Executed Instructions means "32 texture instructions and 64 arithmetic instructions."


Vertex shader 比較[编辑]

Vertex shader 版本 VS 1.1[7] VS 2.0[2][7] VS 2.0a[2][7] VS 3.0[3][7] VS 4.0[4] VS 4.1[8] VS 5.0[6]
# of instruction slots 128 256 256 ≥ 512 4096 4096 4096
Max # of instructions executed Unknown 65536 65536 65536 65536 65536 65536
Instruction predication No No Yes Yes Yes Yes Yes
Temp registers 12 12 13 32 4096 4096 4096
# constant registers ≥ 96 ≥ 256 ≥ 256 ≥ 256 16x4096 16x4096 16x4096
Static flow control  ??? Yes Yes Yes Yes Yes Yes
Dynamic flow control No No Yes Yes Yes Yes Yes
Dynamic flow control depth No No 24 24 Yes Yes Yes
Vertex texture fetch No No No Yes Yes Yes Yes
# of texture samplers N/A N/A N/A 4 128 128 128
Geometry instancing support No No No Yes Yes Yes Yes
Bitwise operators No No No No Yes Yes Yes
Native integers No No No No Yes Yes Yes
  • VS 2.0 = DirectX 9.0 original Shader Model 2 specification.
  • VS 2.0a = NVIDIA GeForce FX-optimized model.
  • VS 3.0 = Shader Model 3.0.
    • Note that ATI X1000 series cards (e.g. X1900) does not support Vertex Texture Fetch, hence it does not fully comply with the VS 3.0 model. Instead, they offer a feature called "Render to Vertex Buffer (R2VB)" that provides functionality that is a superset of Vertex Texture Fetch.[來源請求]
  • VS 4.0 = Shader Model 4.0.
  • VS 4.1 = Shader Model 4.1.
  • VS 5.0 = Shader Model 5.0.

範例[编辑]

灰階貼圖用
  • 灰階值 = 0.3 x 紅 + 0.59 x 綠 + 0.11 x 藍
sampler2D Texture0;
 
float4 ps_main( float2 texCoord  : TEXCOORD0 ) : COLOR
{
   float4 _inColor = tex2D( Texture0, texCoord );
   float gray = 0.3*_inColor.x + 0.59*_inColor.y + 0.11*_inColor.z;
   float4 _outColor = float4(gray, gray, gray, 1.0);
 
   return _outColor;
}

注釋[编辑]

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 Pixel Shader Differences. msdn.microsoft.com. 2011-02-08. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 Peeper, Craig. Microsoft DirectX High Level Shader Language (HLSL) (PPT). microsoft.com. 5–8, 24–25. 2004-03-15. 
  3. ^ 3.0 3.1 Shader Model 3.0, Ashu Rege, NVIDIA Developer Technology Group, 2004.
  4. ^ 4.0 4.1 The Direct3D 10 System, David Blythe, Microsoft Corporation, 2006.
  5. ^ http://msdn.microsoft.com/en-us/library/windows/desktop/ff471379(v=vs.85).aspx
  6. ^ 6.0 6.1 http://msdn.microsoft.com/en-us/library/windows/desktop/hh447212(v=vs.85).aspx
  7. ^ 7.0 7.1 7.2 7.3 Vertex Shader Differences. msdn.microsoft.com. 2011-02-08. 
  8. ^ http://msdn.microsoft.com/en-us/library/windows/desktop/ff471381(v=vs.85).aspx

外部連結[编辑]