Introduction to the DirectX 9 Shader Models - Nvidia
Introduction to the DirectX 9 Shader Models - Nvidia Introduction to the DirectX 9 Shader Models - Nvidia
Static flow control • One way of controlling number of lights • Usually 4 active lights is enough on any one triangle • Benefits of single-pass lighting – Greater speed than multi-pass if vertex bound • Allows more complex vertex shaders – Better precision • fp32-bit shader precision vs. 8-bit FB blender – More flexible combination of lights • Combine lights in ways FB blender doesn’t allow • Shadows are tricky – Can use pre-baked occlusion information, either pervertex or with textures ( similar to lightmaps )
Single Pass Lighting? • Sometimes it does make sense to collapse multiple vertex lights in one pass – Hence the fixed-function pipeline • This works because the fixed function pipeline doesn’t handle shadows • With vertex shaders, one can do pervertex shadowing • Paletted Lighting & Shadowing
- Page 1 and 2: Introduction to the DirectX 9 Shade
- Page 3 and 4: Legacy 1.x Shaders • No discussio
- Page 5 and 6: vs_2_0 • Longer programs • Inte
- Page 7 and 8: vs_2_0 • Old reliable ALU instruc
- Page 9 and 10: Changes to the VS numbers • 256 i
- Page 11 and 12: And some smaller details • Loadin
- Page 13 and 14: Setting Vertex Shader Registers •
- Page 15 and 16: Swizzles & Modifiers
- Page 17 and 18: Control Flow Instructions • Subro
- Page 19 and 20: Loops
- Page 21 and 22: HLSL and Conditionals • Initial r
- Page 23 and 24: Original HLSL Compiler Results vs_2
- Page 25 and 26: Begin Sim VS Sim
- Page 27 and 28: Caps for vs_2_x Sim • New D3DVSHA
- Page 29 and 30: Vertex Shader Predication - HLSL Si
- Page 31 and 32: Vertex Shader Predication Details S
- Page 33 and 34: Nested Static Flow Control Sim •
- Page 35 and 36: Dynamic Flow Control - HLSL Sim for
- Page 37 and 38: End Sim VS Sim
- Page 39 and 40: 2.0 Pixel Shader Instruction Set
- Page 41 and 42: Argument Swizzles •.r, .rrrr, .xx
- Page 43 and 44: ps.2.0 Review - Comparison with ps.
- Page 45 and 46: Caps for Pixel Shader 2.x D3DCAPS9
- Page 47: Pixel Shader 2.x • 512 instructio
- Page 51 and 52: Single-Pass Lighting ? • Detailed
- Page 53 and 54: Single Pass Lighting? • Putting m
- Page 55 and 56: Single Pass Lighting? • It doesn
- Page 57 and 58: Lighting Render Loop • Per Light
- Page 59 and 60: Lighting Render Loop • Per-Object
- Page 61 and 62: Lighting Render Loop Summary • Go
- Page 63 and 64: Predication • Essentially a desti
- Page 65 and 66: Caveats for Conditional Instruction
- Page 67 and 68: Texture fetch with gradients • Gr
- Page 69 and 70: Arbitrary swizzling • Extremely u
- Page 71 and 72: Pixel Shader Precision • Low Prec
- Page 73 and 74: How to use fp16 • In HLSL or Cg,
- Page 75 and 76: Precision Pitfalls • An IEEE-like
- Page 77 and 78: Precision Pitfalls • Most precisi
- Page 79 and 80: Fully Fragment Shading? • Doing t
- Page 81 and 82: Precision Pitfalls • Avoid precis
- Page 83 and 84: Precision Summary • If high-preci
- Page 85 and 86: vs_3_0 • More flow-control • In
- Page 87 and 88: vs_3_0 inputs
- Page 89 and 90: vs_3_0 Output example vs_3_0 dcl_co
- Page 91 and 92: ps_3_0
- Page 93: Lunch Break We will start back up a
Single Pass Lighting?<br />
• Sometimes it does make sense <strong>to</strong><br />
collapse multiple vertex lights in one<br />
pass<br />
– Hence <strong>the</strong> fixed-function pipeline<br />
• This works because <strong>the</strong> fixed function<br />
pipeline doesn’t handle shadows<br />
• With vertex shaders, one can do pervertex<br />
shadowing<br />
• Paletted Lighting & Shadowing
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