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comparison src/zamikongine/vertex.nim @ 35:7f99b21a8777

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add: support for instance data
author Sam <sam@basx.dev>
date Mon, 16 Jan 2023 00:35:41 +0700
parents 94c38e4b5782
children
comparison
equal deleted inserted replaced
34:a3d46f434616 35:7f99b21a8777
16 data*: seq[T] 16 data*: seq[T]
17 PositionAttribute*[T:Vec] = object 17 PositionAttribute*[T:Vec] = object
18 data*: seq[T] 18 data*: seq[T]
19 ColorAttribute*[T:Vec] = object 19 ColorAttribute*[T:Vec] = object
20 data*: seq[T] 20 data*: seq[T]
21 VertexAttribute* = GenericAttribute|PositionAttribute|ColorAttribute 21 InstanceAttribute*[T:Vec] = object
22 data*: seq[T]
23 VertexAttribute* = GenericAttribute|PositionAttribute|ColorAttribute|InstanceAttribute
22 24
23 template getAttributeType*(v: VertexAttribute): auto = get(genericParams(typeof(v)), 0) 25 template getAttributeType*(v: VertexAttribute): auto = get(genericParams(typeof(v)), 0)
24 26
25 func datasize*(attribute: VertexAttribute): uint64 = 27 func datasize*(attribute: VertexAttribute): uint64 =
26 uint64(sizeof(getAttributeType(attribute))) * uint64(attribute.data.len) 28 uint64(sizeof(getAttributeType(attribute))) * uint64(attribute.data.len)
27 29
28 # from https://registry.khronos.org/vulkan/specs/1.3-extensions/html/chap15.html 30 # from https://registry.khronos.org/vulkan/specs/1.3-extensions/html/chap15.html
29 func nLocationSlots[T: VertexAttributeType](): int = 31 func nLocationSlots[T: VertexAttributeType](): int =
30 when (T is Vec3[float64] or T is Vec3[uint64] or T is Vec4[float64] or T is Vec4[float64]): 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]):
31 2 37 2
32 else: 38 else:
33 1 39 1
34 40
35 # numbers 41 # numbers
77 83
78 84
79 85
80 func VertexCount*[T](t: T): uint32 = 86 func VertexCount*[T](t: T): uint32 =
81 for name, value in t.fieldPairs: 87 for name, value in t.fieldPairs:
82 when typeof(value) is VertexAttribute: 88 when typeof(value) is VertexAttribute and not (typeof(value) is InstanceAttribute):
83 if result == 0: 89 if result == 0:
84 result = uint32(value.data.len) 90 result = uint32(value.data.len)
85 else: 91 else:
86 assert result == uint32(value.data.len) 92 assert result == uint32(value.data.len)
87
88 func VertexAttributesCount*[T](): uint32 =
89 for name, value in T().fieldPairs:
90 when typeof(value) is VertexAttribute:
91 result += 1
92 93
93 func generateGLSLVertexDeclarations*[T](): string = 94 func generateGLSLVertexDeclarations*[T](): string =
94 var stmtList: seq[string] 95 var stmtList: seq[string]
95 var i = 0 96 var i = 0
96 for name, value in T().fieldPairs: 97 for name, value in T().fieldPairs:
104 105
105 func generateInputVertexBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputBindingDescription] = 106 func generateInputVertexBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputBindingDescription] =
106 # packed attribute data, not interleaved (aks "struct of arrays") 107 # packed attribute data, not interleaved (aks "struct of arrays")
107 var binding = bindingoffset 108 var binding = bindingoffset
108 for name, value in T().fieldPairs: 109 for name, value in T().fieldPairs:
109 when typeof(value) is VertexAttribute: 110 when typeof(value) is InstanceAttribute:
110 result.add( 111 result.add(
111 VkVertexInputBindingDescription( 112 VkVertexInputBindingDescription(
112 binding: uint32(binding), 113 binding: uint32(binding),
113 stride: uint32(sizeof(getAttributeType(value))), 114 stride: uint32(sizeof(getAttributeType(value))),
114 inputRate: VK_VERTEX_INPUT_RATE_VERTEX, # VK_VERTEX_INPUT_RATE_INSTANCE for instances 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,
115 ) 125 )
116 ) 126 )
117 binding += 1 127 binding += 1
118 128
119 func generateInputAttributeBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputAttributeDescription] = 129 func generateInputAttributeBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputAttributeDescription] =