Mercurial > games > semicongine

annotate examples/E01_hello_triangle.nim @ 586:a136e3f43c2c

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add: mesh primitives
author Sam <sam@basx.dev>
date Tue, 11 Apr 2023 00:58:16 +0700
parents 21c276c0a968
children 512d33d314c4
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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]
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11 color: ColorAttribute[Vec3]
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12
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13 var pipeline: RenderPipeline[VertexDataA, void]
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14
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15 proc globalUpdate(engine: var Engine, t, dt: float32) =
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16 discard
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17
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18 # vertex data (types must match the above VertexAttributes)
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19 const
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20 triangle_pos = @[
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21 Vec2([0.0'f32, -0.5'f32]),
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22 Vec2([0.5'f32, 0.5'f32]),
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23 Vec2([-0.5'f32, 0.5'f32]),
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24 ]
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25 triangle_color = @[
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26 Vec3([1.0'f32, 0.0'f32, 0.0'f32]),
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27 Vec3([0.0'f32, 1.0'f32, 0.0'f32]),
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28 Vec3([0.0'f32, 0.0'f32, 1.0'f32]),
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29 ]
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30
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31 when isMainModule:
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32 var myengine = igniteEngine("Hello triangle")
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33
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34 # build a mesh
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35 var trianglemesh = new Mesh[VertexDataA, uint16]
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36 trianglemesh.vertexData = VertexDataA(
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37 position: PositionAttribute[Vec2](data: triangle_pos),
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38 color: ColorAttribute[Vec3](data: triangle_color),
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39 )
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40 # build a single-object scene graph
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41 var triangle = newThing("triangle", trianglemesh)
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42
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43 # upload data, prepare shaders, etc
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44 const vertexShader = generateVertexShaderCode[VertexDataA, void]()
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45 const fragmentShader = generateFragmentShaderCode[VertexDataA]()
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46 pipeline = setupPipeline[VertexDataA, void, uint16](
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47 myengine,
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48 triangle,
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49 vertexShader,
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50 fragmentShader
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51 )
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52 # show something
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53 myengine.run(pipeline, globalUpdate)
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54 pipeline.trash()
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55 myengine.trash()