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annotate examples/input.nim @ 517:836790efab48

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did: cleanup main namespace, add: better coordinate handling in input example
author Sam <sam@basx.dev>
date Fri, 20 Jan 2023 00:41:55 +0700
parents e89fceb5a3a2
children 547f3a374271
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1 import std/times
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2 import std/strutils
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3 import std/enumerate
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4
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5 import semicongine
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6
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7 type
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8 # define type of vertex
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9 VertexDataA = object
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10 position: PositionAttribute[Vec2[float32]]
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11 color: ColorAttribute[Vec3[float32]]
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12 translate: InstanceAttribute[Vec2[float32]]
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13 Uniforms = object
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14 projection: Descriptor[Mat44[float32]]
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15 cursor: Descriptor[Vec2[float32]]
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16
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17 var
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18 pipeline: RenderPipeline[VertexDataA, Uniforms]
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19 uniforms: Uniforms
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20
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21
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22 proc globalUpdate(engine: var Engine, dt: float32) =
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23 uniforms.cursor.value[0] = float32(engine.input.mouseX)
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24 uniforms.cursor.value[1] = float32(engine.input.mouseY)
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25 uniforms.projection.value = ortho[float32](
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26 0'f32, float32(engine.vulkan.frameDimension.width),
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27 0'f32, float32(engine.vulkan.frameDimension.height),
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28 0'f32, 1'f32,
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29 )
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30 echo uniforms.projection.value
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31 # echo uniforms.projection
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32 for buffer in pipeline.uniformBuffers:
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33 buffer.updateData(uniforms)
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34
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35 # vertex data (types must match the above VertexAttributes)
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36 const
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37 shape = @[
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38 Vec2([- 1'f32, - 1'f32]),
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39 Vec2([ 1'f32, - 1'f32]),
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40 Vec2([-0.3'f32, -0.3'f32]),
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41 Vec2([-0.3'f32, -0.3'f32]),
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42 Vec2([- 1'f32, 1'f32]),
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43 Vec2([- 1'f32, - 1'f32]),
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44 ]
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45 colors = @[
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46 Vec3([1'f32, 0'f32, 0'f32]),
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47 Vec3([1'f32, 0'f32, 0'f32]),
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48 Vec3([1'f32, 0'f32, 0'f32]),
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49 Vec3([0.8'f32, 0'f32, 0'f32]),
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50 Vec3([0.8'f32, 0'f32, 0'f32]),
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51 Vec3([0.8'f32, 0'f32, 0'f32]),
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52 ]
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53
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54 when isMainModule:
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55 var myengine = igniteEngine("Input")
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56
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57 # build a single-object scene graph
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58 var cursor = new Thing
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59 var cursorpart = new Mesh[VertexDataA]
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60 cursorpart.vertexData = VertexDataA(
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61 position: PositionAttribute[Vec2[float32]](data: shape),
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62 color: ColorAttribute[Vec3[float32]](data: colors),
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63 translate: InstanceAttribute[Vec2[float32]](data: @[Vec2[float32]([100'f32, 100'f32])]),
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64 )
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65 # transform the cursor a bit to make it look nice
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66 for i in 0 ..< cursorpart.vertexData.position.data.len:
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67 let cursorscale = (
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68 scale2d(20'f32, 20'f32) *
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69 translate2d(1'f32, 1'f32) *
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70 rotate2d(-float32(PI) / 4'f32) *
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71 scale2d(0.5'f32, 1'f32) *
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72 rotate2d(float32(PI) / 4'f32)
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73 )
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74 let pos = Vec3[float32]([cursorpart.vertexData.position.data[i][0], cursorpart.vertexData.position.data[i][1], 1'f32])
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75 cursorpart.vertexData.position.data[i] = (cursorscale * pos).xy
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76 cursor.parts.add cursorpart
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77
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78 var scene = new Thing
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79 scene.children.add cursor
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80
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81 # upload data, prepare shaders, etc
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82 const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]("""
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83 out_position = uniforms.projection * vec4(in_position + uniforms.cursor, 0, 1);
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84 """)
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85 const fragmentShader = generateFragmentShaderCode[VertexDataA]()
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86 echo vertexShader
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87 echo fragmentShader
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88 pipeline = setupPipeline[VertexDataA, Uniforms, uint16](
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89 myengine,
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90 scene,
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91 vertexShader,
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92 fragmentShader
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93 )
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94 # show something
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95 myengine.run(pipeline, globalUpdate)
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96 pipeline.trash()
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97 myengine.trash()