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annotate examples/hello_cube.nim @ 521:a25325bec7f2

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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 cd73e429fc99
children
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499
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1 #
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2 # TODO: Needs Depth-Buffer first!
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3 #
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7 #
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521
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9
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10
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11 import std/times
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12 import std/strutils
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13
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14 import semicongine
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15
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16 type
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17 # define type of vertex
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18 VertexDataA = object
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19 position: PositionAttribute[Vec3]
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20 color: ColorAttribute[Vec3]
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21 Uniforms = object
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22 model: Descriptor[Mat44]
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23 view: Descriptor[Mat44]
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24 projection: Descriptor[Mat44]
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25
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26 var
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27 pipeline: RenderPipeline[VertexDataA, Uniforms]
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28 uniforms: Uniforms
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29 t: float32
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30
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31
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32 proc globalUpdate(engine: var Engine, dt: float32) =
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33 let ratio = float32(engine.vulkan.frameDimension.height) / float32(
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34 engine.vulkan.frameDimension.width)
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35 t += dt
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36 uniforms.model.value = translate3d(0'f32, 0'f32, 10'f32) * rotate3d(t,
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37 Yf32) # * rotate3d(float32(PI), Yf32)
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38
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39 uniforms.view.value = Unit44f32
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40 uniforms.projection.value = Mat44(data: [
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41 ratio, 0'f32, 0'f32, 0'f32,
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42 0'f32, 1'f32, 0'f32, 0'f32,
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43 0'f32, 0'f32, 1'f32, 0'f32,
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44 0'f32, 0'f32, 0'f32, 1'f32,
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45 ])
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46 uniforms.projection.value = perspective(float32(PI / 4), float32(
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47 engine.vulkan.frameDimension.width) / float32(
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48 engine.vulkan.frameDimension.height), 0.1'f32, 100'f32)
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49 pipeline.updateUniformValues(uniforms)
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50
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51 const
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52 TopLeftFront = Vec3([-0.5'f32, -0.5'f32, -0.5'f32])
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53 TopRightFront = Vec3([0.5'f32, -0.5'f32, -0.5'f32])
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54 BottomRightFront = Vec3([0.5'f32, 0.5'f32, -0.5'f32])
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55 BottomLeftFront = Vec3([-0.5'f32, 0.5'f32, -0.5'f32])
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56 TopLeftBack = Vec3([0.5'f32, -0.5'f32, 0.5'f32])
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57 TopRightBack = Vec3([-0.5'f32, -0.5'f32, 0.5'f32])
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58 BottomRightBack = Vec3([-0.5'f32, 0.5'f32, 0.5'f32])
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59 BottomLeftBack = Vec3([0.5'f32, 0.5'f32, 0.5'f32])
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60 const
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61 cube_pos = @[
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62 TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front
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63 TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back
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64 TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left
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65 TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right
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66 TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top
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67 BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom
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68 ]
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69 cube_color = @[
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70 Rf32, Rf32, Rf32, Rf32,
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71 Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32,
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72 Gf32, Gf32, Gf32, Gf32,
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73 Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32,
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74 Bf32, Bf32, Bf32, Bf32,
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75 Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32,
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76 ]
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77 var
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78 tris: seq[array[3, uint16]]
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79 for i in 0'u16 ..< 6'u16:
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80 let off = i * 4
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81 tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
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82 tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
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83
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84 when isMainModule:
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85 var myengine = igniteEngine("Hello cube")
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86
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87 # build a mesh
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88 var trianglemesh = new IndexedMesh[VertexDataA, uint16]
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89 trianglemesh.vertexData = VertexDataA(
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90 position: PositionAttribute[Vec3](data: cube_pos),
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91 color: ColorAttribute[Vec3](data: cube_color),
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92 )
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93 trianglemesh.indices = tris
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94 var cube = newThing("cube", trianglemesh)
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95
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96 # upload data, prepare shaders, etc
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97 const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]("""
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98 out_position = (uniforms.projection * uniforms.view * uniforms.model) * vec4(in_position, 1);
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99 """)
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100 const fragmentShader = generateFragmentShaderCode[VertexDataA]()
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101 pipeline = setupPipeline[VertexDataA, Uniforms, uint16](
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102 myengine,
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103 cube,
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104 vertexShader,
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105 fragmentShader
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106 )
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107 # show something
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108 myengine.run(pipeline, globalUpdate)
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109 pipeline.trash()
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110 myengine.trash()