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annotate src/zamikongine/vertex.nim @ 493:680c4b8ca28a

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add: working implementation of uniforms
author Sam <sam@basx.dev>
date Sat, 14 Jan 2023 23:34:50 +0700
parents 14e5151f68d1
children 0c18638c7217
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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
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7 import ./math/matrix
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8 import ./vulkan
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9 import ./glsl_helpers
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10
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11 type
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12 VertexAttributeType = SomeNumber|Vec
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13 AttributePurpose* = enum
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14 Unknown, Position Color
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15 GenericAttribute*[T:VertexAttributeType] = object
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16 data*: seq[T]
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17 PositionAttribute*[T:VertexAttributeType] = object
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18 data*: seq[T]
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19 ColorAttribute*[T:VertexAttributeType] = object
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20 data*: seq[T]
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21 VertexAttribute* = GenericAttribute|PositionAttribute|ColorAttribute
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22
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23 template getAttributeType*(v: VertexAttribute): auto = get(genericParams(typeof(v)), 0)
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24
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25 func datasize*(attribute: VertexAttribute): uint64 =
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26 uint64(sizeof(getAttributeType(attribute))) * uint64(attribute.data.len)
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28 # from https://registry.khronos.org/vulkan/specs/1.3-extensions/html/chap15.html
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29 func nLocationSlots[T: VertexAttributeType](): int =
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30 when (T is Vec3[float64] or T is Vec3[uint64] or T is Vec4[float64] or T is Vec4[float64]):
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31 2
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32 else:
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33 1
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35 # numbers
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36 func getVkFormat[T: VertexAttributeType](): VkFormat =
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37 when T is uint8: VK_FORMAT_R8_UINT
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38 elif T is int8: VK_FORMAT_R8_SINT
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39 elif T is uint16: VK_FORMAT_R16_UINT
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40 elif T is int16: VK_FORMAT_R16_SINT
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41 elif T is uint32: VK_FORMAT_R32_UINT
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42 elif T is int32: VK_FORMAT_R32_SINT
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43 elif T is uint64: VK_FORMAT_R64_UINT
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44 elif T is int64: VK_FORMAT_R64_SINT
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45 elif T is float32: VK_FORMAT_R32_SFLOAT
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46 elif T is float64: VK_FORMAT_R64_SFLOAT
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47 elif T is Vec2[uint8]: VK_FORMAT_R8G8_UINT
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48 elif T is Vec2[int8]: VK_FORMAT_R8G8_SINT
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49 elif T is Vec2[uint16]: VK_FORMAT_R16G16_UINT
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50 elif T is Vec2[int16]: VK_FORMAT_R16G16_SINT
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51 elif T is Vec2[uint32]: VK_FORMAT_R32G32_UINT
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52 elif T is Vec2[int32]: VK_FORMAT_R32G32_SINT
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53 elif T is Vec2[uint64]: VK_FORMAT_R64G64_UINT
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54 elif T is Vec2[int64]: VK_FORMAT_R64G64_SINT
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55 elif T is Vec2[float32]: VK_FORMAT_R32G32_SFLOAT
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56 elif T is Vec2[float64]: VK_FORMAT_R64G64_SFLOAT
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57 elif T is Vec3[uint8]: VK_FORMAT_R8G8B8_UINT
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58 elif T is Vec3[int8]: VK_FORMAT_R8G8B8_SINT
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59 elif T is Vec3[uint16]: VK_FORMAT_R16G16B16_UINT
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60 elif T is Vec3[int16]: VK_FORMAT_R16G16B16_SINT
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61 elif T is Vec3[uint32]: VK_FORMAT_R32G32B32_UINT
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62 elif T is Vec3[int32]: VK_FORMAT_R32G32B32_SINT
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63 elif T is Vec3[uint64]: VK_FORMAT_R64G64B64_UINT
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64 elif T is Vec3[int64]: VK_FORMAT_R64G64B64_SINT
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65 elif T is Vec3[float32]: VK_FORMAT_R32G32B32_SFLOAT
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66 elif T is Vec3[float64]: VK_FORMAT_R64G64B64_SFLOAT
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67 elif T is Vec4[uint8]: VK_FORMAT_R8G8B8A8_UINT
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68 elif T is Vec4[int8]: VK_FORMAT_R8G8B8A8_SINT
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69 elif T is Vec4[uint16]: VK_FORMAT_R16G16B16A16_UINT
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70 elif T is Vec4[int16]: VK_FORMAT_R16G16B16A16_SINT
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71 elif T is Vec4[uint32]: VK_FORMAT_R32G32B32A32_UINT
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72 elif T is Vec4[int32]: VK_FORMAT_R32G32B32A32_SINT
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73 elif T is Vec4[uint64]: VK_FORMAT_R64G64B64A64_UINT
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74 elif T is Vec4[int64]: VK_FORMAT_R64G64B64A64_SINT
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75 elif T is Vec4[float32]: VK_FORMAT_R32G32B32A32_SFLOAT
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76 elif T is Vec4[float64]: VK_FORMAT_R64G64B64A64_SFLOAT
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78
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79
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80 func VertexCount*[T](t: T): uint32 =
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81 for name, value in t.fieldPairs:
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82 when typeof(value) is VertexAttribute:
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83 if result == 0:
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84 result = uint32(value.data.len)
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85 else:
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86 assert result == uint32(value.data.len)
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87
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88 func generateGLSLVertexDeclarations*[T](): string =
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89 var stmtList: seq[string]
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90 var i = 0
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91 for name, value in T().fieldPairs:
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92 when typeof(value) is VertexAttribute:
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93 let glsltype = getGLSLType[getAttributeType(value)]()
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94 let n = name
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95 stmtList.add(&"layout(location = {i}) in {glsltype} {n};")
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96 i += nLocationSlots[getAttributeType(value)]()
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97
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98 return stmtList.join("\n")
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99
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100 func generateInputVertexBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputBindingDescription] =
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101 # packed attribute data, not interleaved (aks "struct of arrays")
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102 var binding = bindingoffset
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103 for name, value in T().fieldPairs:
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104 when typeof(value) is VertexAttribute:
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105 result.add(
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106 VkVertexInputBindingDescription(
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107 binding: uint32(binding),
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108 stride: uint32(sizeof(getAttributeType(value))),
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109 inputRate: VK_VERTEX_INPUT_RATE_VERTEX, # VK_VERTEX_INPUT_RATE_INSTANCE for instances
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110 )
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111 )
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112 binding += 1
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113
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114 func generateInputAttributeBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputAttributeDescription] =
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115 # packed attribute data, not interleaved (aks "struct of arrays")
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116 var location = 0
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117 var binding = bindingoffset
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118 for name, value in T().fieldPairs:
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119 when typeof(value) is VertexAttribute:
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120 result.add(
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121 VkVertexInputAttributeDescription(
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122 binding: uint32(binding),
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123 location: uint32(location),
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124 format: getVkFormat[getAttributeType(value)](),
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125 offset: 0,
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126 )
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127 )
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128 location += nLocationSlots[getAttributeType(value)]()
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129 binding += 1