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annotate examples/input.nim @ 60:c57285d292b6

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did: deep refactoring of handling vertrex attribute and buffer updates, don't ask ;(
author Sam <sam@basx.dev>
date Sun, 22 Jan 2023 22:46:53 +0700
parents d7d9420ba675
children
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60
c57285d292b6 did: deep refactoring of handling vertrex attribute and buffer updates, don't ask ;(
Sam <sam@basx.dev>
parents: 59
diff changeset
1 import std/strutils
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2 import std/times
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3
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4 import semicongine
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5
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6 type
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7 # define type of vertex
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8 VertexDataA = object
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9 position: PositionAttribute[Vec2]
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10 color: ColorAttribute[Vec3]
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11 # transform: ModelTransformAttribute
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12 # TODO: make this somehow a single vertex attribute
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13 m1: GenericInstanceAttribute[Vec4]
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14 m2: GenericInstanceAttribute[Vec4]
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15 m3: GenericInstanceAttribute[Vec4]
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16 m4: GenericInstanceAttribute[Vec4]
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17 Uniforms = object
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18 projection: Descriptor[Mat44]
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19 cursor: Descriptor[Vec2]
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21 var
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22 pipeline: RenderPipeline[VertexDataA, Uniforms]
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23 uniforms: Uniforms
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24 scene: Thing
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25 time: float
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28 proc globalUpdate(engine: var Engine, dt: float32) =
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29 time += dt
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30 uniforms.cursor.value = engine.input.mousePos
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31 uniforms.projection.value = ortho[float32](
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32 0'f32, float32(engine.vulkan.frameSize.x),
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33 0'f32, float32(engine.vulkan.frameSize.y),
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34 0'f32, 1'f32,
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35 )
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36 engine.vulkan.device.updateUniformData(pipeline, uniforms)
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37
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38 let cursor = firstPartWithName[Mesh[VertexDataA]](scene, "cursor")
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39 if cursor != nil:
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40 for c in cursor.vertexData.color.data.mitems:
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41 c[1] = (sin(time * 8) * 0.5 + 0.5) * 0.2
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42 c[2] = (sin(time * 8) * 0.5 + 0.5) * 0.2
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43 engine.vulkan.device.updateVertexData(cursor.vertexData.color)
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44 var trans = Unit44 * translate3d(engine.input.mousePos.x,
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45 engine.input.mousePos.y, 0'f32)
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46 cursor.vertexData.m1.data = @[trans.col(0)]
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47 cursor.vertexData.m2.data = @[trans.col(1)]
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48 cursor.vertexData.m3.data = @[trans.col(2)]
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49 cursor.vertexData.m4.data = @[trans.col(3)]
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50 engine.vulkan.device.updateVertexData(cursor.vertexData.m1)
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51 engine.vulkan.device.updateVertexData(cursor.vertexData.m2)
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52 engine.vulkan.device.updateVertexData(cursor.vertexData.m3)
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53 engine.vulkan.device.updateVertexData(cursor.vertexData.m4)
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55
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56 const
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57 shape = @[
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58 Vec2([ - 1'f32, - 1'f32]),
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59 Vec2([1'f32, - 1'f32]),
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60 Vec2([-0.3'f32, -0.3'f32]),
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61 Vec2([-0.3'f32, -0.3'f32]),
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62 Vec2([ - 1'f32, 1'f32]),
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63 Vec2([ - 1'f32, - 1'f32]),
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64 ]
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65 colors = @[
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66 Vec3([1'f32, 0'f32, 0'f32]),
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67 Vec3([1'f32, 0'f32, 0'f32]),
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68 Vec3([1'f32, 0'f32, 0'f32]),
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69 Vec3([0.8'f32, 0'f32, 0'f32]),
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70 Vec3([0.8'f32, 0'f32, 0'f32]),
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71 Vec3([0.8'f32, 0'f32, 0'f32]),
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72 ]
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74 when isMainModule:
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75 var myengine = igniteEngine("Input")
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76
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77 var cursormesh = new Mesh[VertexDataA]
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78 cursormesh.vertexData = VertexDataA(
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79 position: PositionAttribute[Vec2](data: shape, useOnDeviceMemory: true),
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80 color: ColorAttribute[Vec3](data: colors),
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81 # transform: ModelTransformAttribute(data: @[Unit44]),
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82 m1: GenericInstanceAttribute[Vec4](data: @[Unit44.row(0)]),
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83 m2: GenericInstanceAttribute[Vec4](data: @[Unit44.row(1)]),
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84 m3: GenericInstanceAttribute[Vec4](data: @[Unit44.row(2)]),
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85 m4: GenericInstanceAttribute[Vec4](data: @[Unit44.row(3)]),
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86 )
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87 # transform the cursor a bit to make it look nice
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88 for i in 0 ..< cursormesh.vertexData.position.data.len:
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89 let cursorscale = (
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90 scale2d(20'f32, 20'f32) *
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91 translate2d(1'f32, 1'f32) *
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92 rotate2d(-float32(PI) / 4'f32) *
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93 scale2d(0.5'f32, 1'f32) *
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94 rotate2d(float32(PI) / 4'f32)
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95 )
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96 let pos = Vec3([cursormesh.vertexData.position.data[i][0],
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97 cursormesh.vertexData.position.data[i][1], 1'f32])
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98 cursormesh.vertexData.position.data[i] = (cursorscale * pos).xy
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99
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100 var boxmesh = new Mesh[VertexDataA]
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101 boxmesh.vertexData = VertexDataA(
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102 position: PositionAttribute[Vec2](data: shape),
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103 color: ColorAttribute[Vec3](data: colors),
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104 # transform: ModelTransformAttribute(data: @[Unit44]),
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105 m1: GenericInstanceAttribute[Vec4](data: @[Unit44.row(0)]),
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106 m2: GenericInstanceAttribute[Vec4](data: @[Unit44.row(1)]),
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107 m3: GenericInstanceAttribute[Vec4](data: @[Unit44.row(2)]),
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108 m4: GenericInstanceAttribute[Vec4](data: @[Unit44.row(3)]),
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109 )
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110 for i in 0 ..< boxmesh.vertexData.position.data.len:
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111 let boxscale = translate2d(100'f32, 100'f32) * scale2d(100'f32, 100'f32)
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112 let pos = Vec3([boxmesh.vertexData.position.data[i][0],
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113 boxmesh.vertexData.position.data[i][1], 1'f32])
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114 boxmesh.vertexData.position.data[i] = (boxscale * pos).xy
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115 echo boxmesh.vertexData.position.data
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116
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117 scene = newThing("scene")
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118 scene.add newThing("cursor", cursormesh)
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119 scene.add newThing("a box", boxmesh, newTransform(Unit44), newTransform(
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120 translate3d(1'f32, 0'f32, 0'f32)))
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121 scene.add newTransform(scale3d(1.5'f32, 1.5'f32, 1.5'f32))
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122
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123 # upload data, prepare shaders, etc
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124 const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]("""
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125 mat4 mat = mat4(m1, m2, m3, m4);
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126 out_position = uniforms.projection * mat * vec4(position, 0, 1);
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127 """)
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128 echo vertexShader
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129 const fragmentShader = generateFragmentShaderCode[VertexDataA]()
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130 pipeline = setupPipeline[VertexDataA, Uniforms, uint16](
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131 myengine,
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132 scene,
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133 vertexShader,
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134 fragmentShader
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135 )
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136 # show something
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137 myengine.run(pipeline, globalUpdate)
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138 pipeline.trash()
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139 myengine.trash()