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comparison examples/hello_cube.nim @ 38:c3c963e7c1a6

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did: tons of stuff, input, refactoring, fix some errors, some template improvment, sorry for super-commit
author Sam <sam@basx.dev>
date Wed, 18 Jan 2023 09:52:03 +0700
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children 0cb294c5d2fd
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37:6859bcfabc62 38:c3c963e7c1a6
1 #
2 # TODO: Needs Depth-Buffer first!
3 #
4 #
5 #
6 #
7 #
8 #
9 #
10 #
11 import std/times
12 import std/strutils
13 import std/enumerate
14
15 import zamikongine/engine
16 import zamikongine/math/vector
17 import zamikongine/math/matrix
18 import zamikongine/vertex
19 import zamikongine/descriptor
20 import zamikongine/mesh
21 import zamikongine/thing
22 import zamikongine/shader
23 import zamikongine/buffer
24
25 type
26 # define type of vertex
27 VertexDataA = object
28 position: PositionAttribute[Vec3[float32]]
29 color: ColorAttribute[Vec3[float32]]
30 Uniforms = object
31 model: Descriptor[Mat44[float32]]
32 view: Descriptor[Mat44[float32]]
33 projection: Descriptor[Mat44[float32]]
34
35 var
36 pipeline: RenderPipeline[VertexDataA, Uniforms]
37 uniforms:Uniforms
38 t: float32
39
40
41 proc globalUpdate(engine: var Engine, dt: float32) =
42 let ratio = float32(engine.vulkan.frameDimension.height) / float32(engine.vulkan.frameDimension.width)
43 t += dt
44 uniforms.model.value = translate3d(0'f32, 0'f32, 10'f32) * rotate3d(t, Yf32) # * rotate3d(float32(PI), Yf32)
45
46 uniforms.view.value = Unit44f32
47 uniforms.projection.value = Mat44[float32](data:[
48 ratio, 0'f32, 0'f32, 0'f32,
49 0'f32, 1'f32, 0'f32, 0'f32,
50 0'f32, 0'f32, 1'f32, 0'f32,
51 0'f32, 0'f32, 0'f32, 1'f32,
52 ])
53 uniforms.projection.value = perspective(float32(PI / 4), float32(engine.vulkan.frameDimension.width) / float32(engine.vulkan.frameDimension.height), 0.1'f32, 100'f32)
54 for buffer in pipeline.uniformBuffers:
55 buffer.updateData(uniforms)
56 echo uniforms.projection.value
57
58 const
59 TopLeftFront = Vec3([ -0.5'f32, -0.5'f32, -0.5'f32])
60 TopRightFront = Vec3([ 0.5'f32, -0.5'f32, -0.5'f32])
61 BottomRightFront = Vec3([ 0.5'f32, 0.5'f32, -0.5'f32])
62 BottomLeftFront = Vec3([ -0.5'f32, 0.5'f32, -0.5'f32])
63 TopLeftBack = Vec3([ 0.5'f32, -0.5'f32, 0.5'f32])
64 TopRightBack = Vec3([ -0.5'f32, -0.5'f32, 0.5'f32])
65 BottomRightBack = Vec3([ -0.5'f32, 0.5'f32, 0.5'f32])
66 BottomLeftBack = Vec3([ 0.5'f32, 0.5'f32, 0.5'f32])
67 const
68 cube_pos = @[
69 TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front
70 TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back
71 TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left
72 TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right
73 TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top
74 BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom
75 ]
76 cube_color = @[
77 Rf32, Rf32, Rf32, Rf32,
78 Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32,
79 Gf32, Gf32, Gf32, Gf32,
80 Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32,
81 Bf32, Bf32, Bf32, Bf32,
82 Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32,
83 ]
84 var
85 tris: seq[array[3, uint16]]
86 # for i in 0'u16 ..< 6'u16:
87 # let off = i * 4
88 var off = 0'u16 * 4
89 # tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
90 # tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
91 # off = 1'u16 * 4
92 # tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
93 # tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
94 # off = 4'u16 * 4
95 # tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
96 # tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
97 # off = 3'u16 * 4
98 # tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
99 # tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
100
101 when isMainModule:
102 var myengine = igniteEngine("Hello cube")
103
104 # build a mesh
105 var trianglemesh = new IndexedMesh[VertexDataA, uint16]
106 trianglemesh.vertexData = VertexDataA(
107 position: PositionAttribute[Vec3[float32]](data: cube_pos),
108 color: ColorAttribute[Vec3[float32]](data: cube_color),
109 )
110 trianglemesh.indices = tris
111 # build a single-object scene graph
112 var triangle = new Thing
113 # add the triangle mesh to the object
114 triangle.parts.add trianglemesh
115
116 # upload data, prepare shaders, etc
117 const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]("""
118 out_position = (uniforms.projection * uniforms.view * uniforms.model) * vec4(in_position, 1);
119 """)
120 const fragmentShader = generateFragmentShaderCode[VertexDataA]()
121 pipeline = setupPipeline[VertexDataA, Uniforms, uint16](
122 myengine,
123 triangle,
124 vertexShader,
125 fragmentShader
126 )
127 # show something
128 myengine.run(pipeline, globalUpdate)
129 pipeline.trash()
130 myengine.trash()