Mercurial > games > semicongine
annotate src/zamikongine/vertex.nim @ 498:2fa8e418deae
did: update notes
author | Sam <sam@basx.dev> |
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date | Mon, 16 Jan 2023 00:51:03 +0700 |
parents | b41733878bc6 |
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1 import std/macros |
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2 import std/strutils |
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3 import std/strformat |
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4 import std/typetraits |
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5 |
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6 import ./math/vector |
493 | 7 import ./math/matrix |
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8 import ./vulkan |
493 | 9 import ./glsl_helpers |
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10 |
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11 type |
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12 VertexAttributeType = SomeNumber|Vec |
493 | 13 AttributePurpose* = enum |
14 Unknown, Position Color | |
15 GenericAttribute*[T:VertexAttributeType] = object | |
16 data*: seq[T] | |
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17 PositionAttribute*[T:Vec] = object |
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18 data*: seq[T] |
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19 ColorAttribute*[T:Vec] = object |
493 | 20 data*: seq[T] |
496 | 21 InstanceAttribute*[T:Vec] = object |
22 data*: seq[T] | |
23 VertexAttribute* = GenericAttribute|PositionAttribute|ColorAttribute|InstanceAttribute | |
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24 |
493 | 25 template getAttributeType*(v: VertexAttribute): auto = get(genericParams(typeof(v)), 0) |
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26 |
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27 func datasize*(attribute: VertexAttribute): uint64 = |
493 | 28 uint64(sizeof(getAttributeType(attribute))) * uint64(attribute.data.len) |
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29 |
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30 # from https://registry.khronos.org/vulkan/specs/1.3-extensions/html/chap15.html |
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31 func nLocationSlots[T: VertexAttributeType](): int = |
496 | 32 when (T is Mat44[float64]): |
33 8 | |
34 elif (T is Mat44[float32]): | |
35 4 | |
36 elif (T is Vec3[float64] or T is Vec3[uint64] or T is Vec4[float64] or T is Vec4[float64]): | |
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37 2 |
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38 else: |
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39 1 |
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40 |
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41 # numbers |
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42 func getVkFormat[T: VertexAttributeType](): VkFormat = |
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43 when T is uint8: VK_FORMAT_R8_UINT |
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44 elif T is int8: VK_FORMAT_R8_SINT |
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45 elif T is uint16: VK_FORMAT_R16_UINT |
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46 elif T is int16: VK_FORMAT_R16_SINT |
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47 elif T is uint32: VK_FORMAT_R32_UINT |
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48 elif T is int32: VK_FORMAT_R32_SINT |
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49 elif T is uint64: VK_FORMAT_R64_UINT |
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50 elif T is int64: VK_FORMAT_R64_SINT |
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51 elif T is float32: VK_FORMAT_R32_SFLOAT |
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52 elif T is float64: VK_FORMAT_R64_SFLOAT |
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53 elif T is Vec2[uint8]: VK_FORMAT_R8G8_UINT |
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54 elif T is Vec2[int8]: VK_FORMAT_R8G8_SINT |
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55 elif T is Vec2[uint16]: VK_FORMAT_R16G16_UINT |
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56 elif T is Vec2[int16]: VK_FORMAT_R16G16_SINT |
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57 elif T is Vec2[uint32]: VK_FORMAT_R32G32_UINT |
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58 elif T is Vec2[int32]: VK_FORMAT_R32G32_SINT |
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59 elif T is Vec2[uint64]: VK_FORMAT_R64G64_UINT |
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60 elif T is Vec2[int64]: VK_FORMAT_R64G64_SINT |
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61 elif T is Vec2[float32]: VK_FORMAT_R32G32_SFLOAT |
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62 elif T is Vec2[float64]: VK_FORMAT_R64G64_SFLOAT |
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63 elif T is Vec3[uint8]: VK_FORMAT_R8G8B8_UINT |
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64 elif T is Vec3[int8]: VK_FORMAT_R8G8B8_SINT |
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65 elif T is Vec3[uint16]: VK_FORMAT_R16G16B16_UINT |
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66 elif T is Vec3[int16]: VK_FORMAT_R16G16B16_SINT |
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67 elif T is Vec3[uint32]: VK_FORMAT_R32G32B32_UINT |
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68 elif T is Vec3[int32]: VK_FORMAT_R32G32B32_SINT |
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69 elif T is Vec3[uint64]: VK_FORMAT_R64G64B64_UINT |
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70 elif T is Vec3[int64]: VK_FORMAT_R64G64B64_SINT |
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71 elif T is Vec3[float32]: VK_FORMAT_R32G32B32_SFLOAT |
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72 elif T is Vec3[float64]: VK_FORMAT_R64G64B64_SFLOAT |
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73 elif T is Vec4[uint8]: VK_FORMAT_R8G8B8A8_UINT |
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74 elif T is Vec4[int8]: VK_FORMAT_R8G8B8A8_SINT |
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75 elif T is Vec4[uint16]: VK_FORMAT_R16G16B16A16_UINT |
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76 elif T is Vec4[int16]: VK_FORMAT_R16G16B16A16_SINT |
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77 elif T is Vec4[uint32]: VK_FORMAT_R32G32B32A32_UINT |
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78 elif T is Vec4[int32]: VK_FORMAT_R32G32B32A32_SINT |
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79 elif T is Vec4[uint64]: VK_FORMAT_R64G64B64A64_UINT |
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80 elif T is Vec4[int64]: VK_FORMAT_R64G64B64A64_SINT |
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81 elif T is Vec4[float32]: VK_FORMAT_R32G32B32A32_SFLOAT |
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82 elif T is Vec4[float64]: VK_FORMAT_R64G64B64A64_SFLOAT |
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83 |
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84 |
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85 |
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86 func VertexCount*[T](t: T): uint32 = |
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87 for name, value in t.fieldPairs: |
496 | 88 when typeof(value) is VertexAttribute and not (typeof(value) is InstanceAttribute): |
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89 if result == 0: |
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90 result = uint32(value.data.len) |
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91 else: |
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92 assert result == uint32(value.data.len) |
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93 |
493 | 94 func generateGLSLVertexDeclarations*[T](): string = |
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95 var stmtList: seq[string] |
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96 var i = 0 |
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97 for name, value in T().fieldPairs: |
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98 when typeof(value) is VertexAttribute: |
493 | 99 let glsltype = getGLSLType[getAttributeType(value)]() |
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100 let n = name |
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101 stmtList.add(&"layout(location = {i}) in {glsltype} {n};") |
493 | 102 i += nLocationSlots[getAttributeType(value)]() |
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103 |
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104 return stmtList.join("\n") |
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105 |
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106 func generateInputVertexBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputBindingDescription] = |
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107 # packed attribute data, not interleaved (aks "struct of arrays") |
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108 var binding = bindingoffset |
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109 for name, value in T().fieldPairs: |
496 | 110 when typeof(value) is InstanceAttribute: |
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111 result.add( |
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112 VkVertexInputBindingDescription( |
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113 binding: uint32(binding), |
493 | 114 stride: uint32(sizeof(getAttributeType(value))), |
496 | 115 inputRate: VK_VERTEX_INPUT_RATE_INSTANCE, |
116 ) | |
117 ) | |
118 binding += 1 | |
119 elif typeof(value) is VertexAttribute: | |
120 result.add( | |
121 VkVertexInputBindingDescription( | |
122 binding: uint32(binding), | |
123 stride: uint32(sizeof(getAttributeType(value))), | |
124 inputRate: VK_VERTEX_INPUT_RATE_VERTEX, | |
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125 ) |
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126 ) |
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127 binding += 1 |
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128 |
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129 func generateInputAttributeBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputAttributeDescription] = |
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130 # packed attribute data, not interleaved (aks "struct of arrays") |
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131 var location = 0 |
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132 var binding = bindingoffset |
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133 for name, value in T().fieldPairs: |
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134 when typeof(value) is VertexAttribute: |
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135 result.add( |
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136 VkVertexInputAttributeDescription( |
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137 binding: uint32(binding), |
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138 location: uint32(location), |
493 | 139 format: getVkFormat[getAttributeType(value)](), |
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140 offset: 0, |
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141 ) |
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142 ) |
493 | 143 location += nLocationSlots[getAttributeType(value)]() |
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144 binding += 1 |