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annotate src/zamikongine/vertex.nim @ 481:c472abfcee57

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add: generate ubermeshes
author Sam <sam@basx.dev>
date Tue, 10 Jan 2023 00:23:40 +0700
parents 14e5151f68d1
children 680c4b8ca28a
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480
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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 ./vulkan
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8
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9 type
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10 VertexAttributeType = SomeNumber|Vec
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11 VertexAttribute*[T:VertexAttributeType] = object
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12 data*: seq[T]
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13
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14 template rawAttributeType(v: VertexAttribute): auto = get(genericParams(typeof(v)), 0)
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15
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16 func datasize*(attribute: VertexAttribute): uint64 =
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17 uint64(sizeof(rawAttributeType(attribute))) * uint64(attribute.data.len)
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18
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19 # from https://registry.khronos.org/vulkan/specs/1.3-extensions/html/chap15.html
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20 func nLocationSlots[T: VertexAttributeType](): int =
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21 when (T is Vec3[float64] or T is Vec3[uint64] or T is Vec4[float64] or T is Vec4[float64]):
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22 2
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23 else:
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24 1
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25
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26 # numbers
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27 func getVkFormat[T: VertexAttributeType](): VkFormat =
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28 when T is uint8: VK_FORMAT_R8_UINT
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29 elif T is int8: VK_FORMAT_R8_SINT
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30 elif T is uint16: VK_FORMAT_R16_UINT
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31 elif T is int16: VK_FORMAT_R16_SINT
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32 elif T is uint32: VK_FORMAT_R32_UINT
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33 elif T is int32: VK_FORMAT_R32_SINT
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34 elif T is uint64: VK_FORMAT_R64_UINT
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35 elif T is int64: VK_FORMAT_R64_SINT
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36 elif T is float32: VK_FORMAT_R32_SFLOAT
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37 elif T is float64: VK_FORMAT_R64_SFLOAT
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38 elif T is Vec2[uint8]: VK_FORMAT_R8G8_UINT
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39 elif T is Vec2[int8]: VK_FORMAT_R8G8_SINT
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40 elif T is Vec2[uint16]: VK_FORMAT_R16G16_UINT
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41 elif T is Vec2[int16]: VK_FORMAT_R16G16_SINT
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42 elif T is Vec2[uint32]: VK_FORMAT_R32G32_UINT
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43 elif T is Vec2[int32]: VK_FORMAT_R32G32_SINT
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44 elif T is Vec2[uint64]: VK_FORMAT_R64G64_UINT
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45 elif T is Vec2[int64]: VK_FORMAT_R64G64_SINT
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46 elif T is Vec2[float32]: VK_FORMAT_R32G32_SFLOAT
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47 elif T is Vec2[float64]: VK_FORMAT_R64G64_SFLOAT
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48 elif T is Vec3[uint8]: VK_FORMAT_R8G8B8_UINT
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49 elif T is Vec3[int8]: VK_FORMAT_R8G8B8_SINT
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50 elif T is Vec3[uint16]: VK_FORMAT_R16G16B16_UINT
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51 elif T is Vec3[int16]: VK_FORMAT_R16G16B16_SINT
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52 elif T is Vec3[uint32]: VK_FORMAT_R32G32B32_UINT
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53 elif T is Vec3[int32]: VK_FORMAT_R32G32B32_SINT
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54 elif T is Vec3[uint64]: VK_FORMAT_R64G64B64_UINT
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55 elif T is Vec3[int64]: VK_FORMAT_R64G64B64_SINT
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56 elif T is Vec3[float32]: VK_FORMAT_R32G32B32_SFLOAT
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57 elif T is Vec3[float64]: VK_FORMAT_R64G64B64_SFLOAT
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58 elif T is Vec4[uint8]: VK_FORMAT_R8G8B8A8_UINT
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59 elif T is Vec4[int8]: VK_FORMAT_R8G8B8A8_SINT
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60 elif T is Vec4[uint16]: VK_FORMAT_R16G16B16A16_UINT
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61 elif T is Vec4[int16]: VK_FORMAT_R16G16B16A16_SINT
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62 elif T is Vec4[uint32]: VK_FORMAT_R32G32B32A32_UINT
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63 elif T is Vec4[int32]: VK_FORMAT_R32G32B32A32_SINT
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64 elif T is Vec4[uint64]: VK_FORMAT_R64G64B64A64_UINT
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65 elif T is Vec4[int64]: VK_FORMAT_R64G64B64A64_SINT
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66 elif T is Vec4[float32]: VK_FORMAT_R32G32B32A32_SFLOAT
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67 elif T is Vec4[float64]: VK_FORMAT_R64G64B64A64_SFLOAT
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68
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69 func getGLSLType[T: VertexAttributeType](): string =
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70 # todo: likely not correct as we would need to enable some
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71 # extensions somewhere (Vulkan/GLSL compiler?) to have
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72 # everything work as intended. Or maybe the GPU driver does
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73 # some automagic conversion stuf..
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74 when T is uint8: "uint"
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75 elif T is int8: "int"
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76 elif T is uint16: "uint"
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77 elif T is int16: "int"
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78 elif T is uint32: "uint"
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79 elif T is int32: "int"
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80 elif T is uint64: "uint"
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81 elif T is int64: "int"
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82 elif T is float32: "float"
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83 elif T is float64: "double"
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84
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85 elif T is Vec2[uint8]: "uvec2"
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86 elif T is Vec2[int8]: "ivec2"
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87 elif T is Vec2[uint16]: "uvec2"
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88 elif T is Vec2[int16]: "ivec2"
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89 elif T is Vec2[uint32]: "uvec2"
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90 elif T is Vec2[int32]: "ivec2"
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91 elif T is Vec2[uint64]: "uvec2"
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92 elif T is Vec2[int64]: "ivec2"
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93 elif T is Vec2[float32]: "vec2"
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94 elif T is Vec2[float64]: "dvec2"
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95
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96 elif T is Vec3[uint8]: "uvec3"
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97 elif T is Vec3[int8]: "ivec3"
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98 elif T is Vec3[uint16]: "uvec3"
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99 elif T is Vec3[int16]: "ivec3"
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100 elif T is Vec3[uint32]: "uvec3"
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101 elif T is Vec3[int32]: "ivec3"
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102 elif T is Vec3[uint64]: "uvec3"
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103 elif T is Vec3[int64]: "ivec3"
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104 elif T is Vec3[float32]: "vec3"
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105 elif T is Vec3[float64]: "dvec3"
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106
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107 elif T is Vec4[uint8]: "uvec4"
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108 elif T is Vec4[int8]: "ivec4"
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109 elif T is Vec4[uint16]: "uvec4"
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110 elif T is Vec4[int16]: "ivec4"
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111 elif T is Vec4[uint32]: "uvec4"
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112 elif T is Vec4[int32]: "ivec4"
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113 elif T is Vec4[uint64]: "uvec4"
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114 elif T is Vec4[int64]: "ivec4"
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115 elif T is Vec4[float32]: "vec4"
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116 elif T is Vec4[float64]: "dvec4"
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117
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118
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119 func VertexCount*[T](t: T): uint32 =
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120 for name, value in t.fieldPairs:
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121 when typeof(value) is VertexAttribute:
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122 if result == 0:
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123 result = uint32(value.data.len)
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124 else:
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125 assert result == uint32(value.data.len)
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126
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127 func generateGLSLDeclarations*[T](): string =
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128 var stmtList: seq[string]
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129 var i = 0
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130 for name, value in T().fieldPairs:
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131 when typeof(value) is VertexAttribute:
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132 let glsltype = getGLSLType[rawAttributeType(value)]()
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133 let n = name
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134 stmtList.add(&"layout(location = {i}) in {glsltype} {n};")
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135 i += nLocationSlots[rawAttributeType(value)]()
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136
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137 return stmtList.join("\n")
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138
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139 func generateInputVertexBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputBindingDescription] =
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140 # packed attribute data, not interleaved (aks "struct of arrays")
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141 var binding = bindingoffset
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142 for name, value in T().fieldPairs:
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143 when typeof(value) is VertexAttribute:
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144 result.add(
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145 VkVertexInputBindingDescription(
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146 binding: uint32(binding),
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147 stride: uint32(sizeof(rawAttributeType(value))),
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148 inputRate: VK_VERTEX_INPUT_RATE_VERTEX, # VK_VERTEX_INPUT_RATE_INSTANCE for instances
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149 )
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150 )
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151 binding += 1
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152
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153 func generateInputAttributeBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputAttributeDescription] =
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154 # packed attribute data, not interleaved (aks "struct of arrays")
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155 var location = 0
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156 var binding = bindingoffset
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157 for name, value in T().fieldPairs:
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158 when typeof(value) is VertexAttribute:
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159 result.add(
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160 VkVertexInputAttributeDescription(
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161 binding: uint32(binding),
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162 location: uint32(location),
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163 format: getVkFormat[rawAttributeType(value)](),
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164 offset: 0,
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165 )
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166 )
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167 location += nLocationSlots[rawAttributeType(value)]()
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168 binding += 1