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annotate examples/hello_triangle.nim @ 489:54a1f8ee208e

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big refactoring, part1
author Sam <sam@basx.dev>
date Sat, 14 Jan 2023 14:08:00 +0700
parents b4a972bd37d5
children 680c4b8ca28a
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489
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1 import std/times
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2
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3 import zamikongine/engine
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4 import zamikongine/math/vector
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5 import zamikongine/vertex
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6 import zamikongine/mesh
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7 import zamikongine/thing
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8 import zamikongine/shader
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9 import zamikongine/buffer
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10
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11 type
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12 # define type of vertex
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13 VertexDataA = object
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14 position: VertexAttribute[Vec2[float32]]
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15 color: VertexAttribute[Vec3[float32]]
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16 UniformType = float32
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17
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18 proc globalUpdate(engine: var Engine, dt: Duration) =
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19 # var t = float32(dt.inNanoseconds) / 1_000_000_000'f32
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20 # for buffer in engine.vulkan.uniformBuffers:
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21 # buffer.updateData(t)
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22
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23 echo dt
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24
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25 # vertex data (types must match the above VertexAttributes)
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26 const
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27 triangle_pos = @[
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28 Vec2([ 0.0'f32, -0.5'f32]),
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29 Vec2([ 0.5'f32, 0.5'f32]),
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30 Vec2([-0.5'f32, 0.5'f32]),
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31 ]
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32 triangle_color = @[
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33 Vec3([1.0'f32, 0.0'f32, 0.0'f32]),
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34 Vec3([0.0'f32, 1.0'f32, 0.0'f32]),
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35 Vec3([0.0'f32, 0.0'f32, 1.0'f32]),
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36 ]
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37
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38 when isMainModule:
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39 var myengine = igniteEngine("Hello triangle")
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40
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41 # build a mesh
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42 var trianglemesh = new Mesh[VertexDataA]
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43 trianglemesh.vertexData = VertexDataA(
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44 position: VertexAttribute[Vec2[float32]](data: triangle_pos),
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45 color: VertexAttribute[Vec3[float32]](data: triangle_color),
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46 )
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47 # build a single-object scene graph
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48 var triangle = new Thing
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49 # add the triangle mesh to the object
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50 triangle.parts.add trianglemesh
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51
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52 # upload data, prepare shaders, etc
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53 var pipeline = setupPipeline[VertexDataA, UniformType, float32, uint16](
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54 myengine,
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55 triangle,
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56 generateVertexShaderCode[VertexDataA]("main", "position", "color"),
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57 generateFragmentShaderCode[VertexDataA]("main"),
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58 )
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59 # show something
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60 myengine.run(pipeline, globalUpdate)
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61 pipeline.trash()
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62 myengine.trash()