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annotate examples/E03_hello_cube.nim @ 103:1e2027dfc642

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add: finally working initial approach for shader definitions
author Sam <sam@basx.dev>
date Mon, 20 Mar 2023 10:25:50 +0700
parents 779607656b12
children 8bb27869b649
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1 #
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2 # TODO: Needs Depth-Buffer first!
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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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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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26 var
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27 pipeline: RenderPipeline[VertexDataA, Uniforms]
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28 uniforms: Uniforms
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31 proc globalUpdate(engine: var Engine, t, dt: float32) =
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32 let ratio = float32(engine.vulkan.frameSize.y) / float32(
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33 engine.vulkan.frameSize.x)
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34 uniforms.model.value = translate3d(0'f32, 0'f32, 10'f32) * rotate3d(t,
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35 Yf32) # * rotate3d(float32(PI), Yf32)
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37 uniforms.view.value = Unit44f32
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38 uniforms.projection.value = Mat44(data: [
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39 ratio, 0'f32, 0'f32, 0'f32,
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40 0'f32, 1'f32, 0'f32, 0'f32,
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41 0'f32, 0'f32, 1'f32, 0'f32,
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42 0'f32, 0'f32, 0'f32, 1'f32,
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43 ])
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44 uniforms.projection.value = perspective(float32(PI / 4), float32(
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45 engine.vulkan.frameSize.x) / float32(
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46 engine.vulkan.frameSize.y), 0.1'f32, 100'f32)
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47 engine.vulkan.device.updateUniformData(pipeline, uniforms)
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49 const
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50 TopLeftFront = Vec3([-0.5'f32, -0.5'f32, -0.5'f32])
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51 TopRightFront = Vec3([0.5'f32, -0.5'f32, -0.5'f32])
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52 BottomRightFront = Vec3([0.5'f32, 0.5'f32, -0.5'f32])
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53 BottomLeftFront = Vec3([-0.5'f32, 0.5'f32, -0.5'f32])
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54 TopLeftBack = Vec3([0.5'f32, -0.5'f32, 0.5'f32])
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55 TopRightBack = Vec3([-0.5'f32, -0.5'f32, 0.5'f32])
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56 BottomRightBack = Vec3([-0.5'f32, 0.5'f32, 0.5'f32])
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57 BottomLeftBack = Vec3([0.5'f32, 0.5'f32, 0.5'f32])
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58 const
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59 cube_pos = @[
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60 TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front
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61 TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back
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62 TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left
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63 TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right
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64 TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top
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65 BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom
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66 ]
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67 cube_color = @[
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68 Rf32, Rf32, Rf32, Rf32,
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69 Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32,
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70 Gf32, Gf32, Gf32, Gf32,
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71 Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32,
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72 Bf32, Bf32, Bf32, Bf32,
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73 Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32,
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74 ]
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75 var
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76 tris: seq[array[3, uint16]]
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77 for i in 0'u16 ..< 6'u16:
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78 let off = i * 4
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79 tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
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80 tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
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81
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82 when isMainModule:
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83 var myengine = igniteEngine("Hello cube")
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84
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85 # build a mesh
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86 var trianglemesh = new Mesh[VertexDataA, uint16]
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87 trianglemesh.indexed = true
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88 trianglemesh.vertexData = VertexDataA(
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89 position: PositionAttribute[Vec3](data: cube_pos),
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90 color: ColorAttribute[Vec3](data: cube_color),
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91 )
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92 trianglemesh.indices = tris
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93 var cube = newThing("cube", trianglemesh)
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94
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95 # upload data, prepare shaders, etc
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96 const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]("""
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97 out_position = (uniforms.projection * uniforms.view * uniforms.model) * vec4(in_position, 1);
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98 """)
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99 const fragmentShader = generateFragmentShaderCode[VertexDataA]()
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100 pipeline = setupPipeline[VertexDataA, Uniforms, uint16](
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101 myengine,
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102 cube,
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103 vertexShader,
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104 fragmentShader
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105 )
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106 # show something
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107 myengine.run(pipeline, globalUpdate)
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108 pipeline.trash()
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109 myengine.trash()