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annotate examples/E04_input.nim @ 522:f2c97bdbb0b3

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did: rename and update older demos to work with new APIs
author Sam <sam@basx.dev>
date Tue, 24 Jan 2023 10:22:38 +0700
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children 0285ff2281b1
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522
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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 Uniforms = object
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13 projection: Descriptor[Mat44]
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14 cursor: Descriptor[Vec2]
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15
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16 var
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17 pipeline: RenderPipeline[VertexDataA, Uniforms]
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18 uniforms: Uniforms
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19 scene: Thing
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20 time: float
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21
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22
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23 proc globalUpdate(engine: var Engine, dt: float32) =
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24 time += dt
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25 uniforms.cursor.value = engine.input.mousePos
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26 uniforms.projection.value = ortho[float32](
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27 0'f32, float32(engine.vulkan.frameSize.x),
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28 0'f32, float32(engine.vulkan.frameSize.y),
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29 0'f32, 1'f32,
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30 )
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31 engine.vulkan.device.updateUniformData(pipeline, uniforms)
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32
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33 let cursor = firstPartWithName[Mesh[VertexDataA]](scene, "cursor")
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34 if cursor != nil:
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35 for c in cursor.vertexData.color.data.mitems:
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36 c[1] = (sin(time * 8) * 0.5 + 0.5) * 0.2
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37 c[2] = (sin(time * 8) * 0.5 + 0.5) * 0.2
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38 engine.vulkan.device.updateVertexData(cursor.vertexData.color)
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39
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40 var trans = translate3d(engine.input.mousePos.x, engine.input.mousePos.y, 0'f32)
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41 # cursor.vertexData.transform.data = @[trans.transposed()]
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42 engine.vulkan.device.updateVertexData(cursor.vertexData.transform)
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43
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44
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45 const
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46 shape = @[
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47 Vec2([ - 1'f32, - 1'f32]),
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48 Vec2([1'f32, - 1'f32]),
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49 Vec2([-0.3'f32, -0.3'f32]),
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50 Vec2([-0.3'f32, -0.3'f32]),
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51 Vec2([ - 1'f32, 1'f32]),
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52 Vec2([ - 1'f32, - 1'f32]),
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53 ]
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54 colors = @[
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55 Vec3([1'f32, 0'f32, 0'f32]),
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56 Vec3([1'f32, 0'f32, 0'f32]),
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57 Vec3([1'f32, 0'f32, 0'f32]),
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58 Vec3([0.8'f32, 0'f32, 0'f32]),
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59 Vec3([0.8'f32, 0'f32, 0'f32]),
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60 Vec3([0.8'f32, 0'f32, 0'f32]),
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61 ]
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62
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63 when isMainModule:
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64 var myengine = igniteEngine("Input")
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65
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66 var cursormesh = new Mesh[VertexDataA]
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67 cursormesh.vertexData = VertexDataA(
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68 position: PositionAttribute[Vec2](data: shape, useOnDeviceMemory: true),
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69 color: ColorAttribute[Vec3](data: colors),
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70 transform: ModelTransformAttribute(data: @[Unit44]),
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71 )
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72 # transform the cursor a bit to make it look nice
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73 for i in 0 ..< cursormesh.vertexData.position.data.len:
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74 let cursorscale = (
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75 scale2d(20'f32, 20'f32) *
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76 translate2d(1'f32, 1'f32) *
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77 rotate2d(-float32(PI) / 4'f32) *
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78 scale2d(0.5'f32, 1'f32) *
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79 rotate2d(float32(PI) / 4'f32)
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80 )
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81 let pos = Vec3([cursormesh.vertexData.position.data[i][0],
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82 cursormesh.vertexData.position.data[i][1], 1'f32])
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83 cursormesh.vertexData.position.data[i] = (cursorscale * pos).xy
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84
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85 var boxmesh = new Mesh[VertexDataA]
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86 boxmesh.vertexData = VertexDataA(
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87 position: PositionAttribute[Vec2](data: shape),
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88 color: ColorAttribute[Vec3](data: colors),
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89 transform: ModelTransformAttribute(data: @[Unit44]),
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90 )
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91 for i in 0 ..< boxmesh.vertexData.position.data.len:
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92 let boxscale = translate2d(100'f32, 100'f32) * scale2d(100'f32, 100'f32)
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93 let pos = Vec3([boxmesh.vertexData.position.data[i][0],
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94 boxmesh.vertexData.position.data[i][1], 1'f32])
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95 boxmesh.vertexData.position.data[i] = (boxscale * pos).xy
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96
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97 scene = newThing("scene")
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98 scene.add newThing("cursor", cursormesh)
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99 scene.add newThing("a box", boxmesh, newTransform(Unit44), newTransform(
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100 translate3d(1'f32, 0'f32, 0'f32)))
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101 scene.add newTransform(scale3d(1.5'f32, 1.5'f32, 1.5'f32))
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102
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103 # upload data, prepare shaders, etc
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104 const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]("""
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105 out_position = uniforms.projection * transform * vec4(position, 0, 1);
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106 """)
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107 const fragmentShader = generateFragmentShaderCode[VertexDataA]()
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108 pipeline = setupPipeline[VertexDataA, Uniforms, uint16](
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109 myengine,
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110 scene,
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111 vertexShader,
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112 fragmentShader
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113 )
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114 # show something
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115 myengine.run(pipeline, globalUpdate)
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116 pipeline.trash()
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117 myengine.trash()