Mercurial > games > semicongine

annotate examples/E03_hello_cube.nim @ 1140:5934c5615f13

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did: update all examples to work with latest refactoring
author sam <sam@basx.dev>
date Sat, 08 Jun 2024 15:16:17 +0700
parents 114f395b9144
children d3e014c3551c
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1 import std/tables
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2 import std/times
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3
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4 import ../semicongine
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5
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6 const
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7 TopLeftFront = NewVec3f(-0.5'f32, -0.5'f32, -0.5'f32)
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8 TopRightFront = NewVec3f(0.5'f32, -0.5'f32, -0.5'f32)
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9 BottomRightFront = NewVec3f(0.5'f32, 0.5'f32, -0.5'f32)
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10 BottomLeftFront = NewVec3f(-0.5'f32, 0.5'f32, -0.5'f32)
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11 TopLeftBack = NewVec3f(0.5'f32, -0.5'f32, 0.5'f32)
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12 TopRightBack = NewVec3f(-0.5'f32, -0.5'f32, 0.5'f32)
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13 BottomRightBack = NewVec3f(-0.5'f32, 0.5'f32, 0.5'f32)
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14 BottomLeftBack = NewVec3f(0.5'f32, 0.5'f32, 0.5'f32)
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15 const
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16 cube_pos = @[
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17 TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front
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18 TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back
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19 TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left
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20 TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right
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21 TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top
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22 BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom
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23 ]
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24 R = NewVec4f(1, 0, 0, 1)
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25 G = NewVec4f(0, 1, 0, 1)
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26 B = NewVec4f(0, 0, 1, 1)
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27 cube_color = @[
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28 R, R, R, R,
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29 R * 0.5'f32, R * 0.5'f32, R * 0.5'f32, R * 0.5'f32,
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30 G, G, G, G,
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31 G * 0.5'f32, G * 0.5'f32, G * 0.5'f32, G * 0.5'f32,
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32 B, B, B, B,
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33 B * 0.5'f32, B * 0.5'f32, B * 0.5'f32, B * 0.5'f32,
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34 ]
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35 var
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36 tris: seq[array[3, uint16]]
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37 for i in 0'u16 ..< 6'u16:
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38 let off = i * 4
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39 tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
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40 tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
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41
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42 when isMainModule:
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43 var myengine = InitEngine("Hello cube")
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44
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45 const
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46 shaderConfiguration = CreateShaderConfiguration(
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47 name = "default shader",
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48 inputs = [
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49 Attr[Vec3f]("position"),
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50 Attr[Vec4f]("color", memoryPerformanceHint = PreferFastWrite),
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51 ],
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52 intermediates = [Attr[Vec4f]("outcolor")],
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53 uniforms = [
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54 Attr[Mat4]("projection"),
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55 Attr[Mat4]("view"),
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56 Attr[Mat4]("model"),
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57 ],
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58 outputs = [Attr[Vec4f]("color")],
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59 vertexCode = """outcolor = color; gl_Position = (Uniforms.projection * Uniforms.view * Uniforms.model) * vec4(position, 1);""",
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60 fragmentCode = "color = outcolor;",
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61 )
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62 var matDef = MaterialType(name: "default material", vertexAttributes: {"position": Vec3F32, "color": Vec4F32}.toTable)
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63 var cube = Scene(name: "scene", meshes: @[NewMesh(positions = cube_pos, indices = tris, colors = cube_color, material = matDef.InitMaterialData(name = "default"))])
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64 cube.AddShaderGlobal("projection", Unit4f32)
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65 cube.AddShaderGlobal("view", Unit4f32)
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66 cube.AddShaderGlobal("model", Unit4f32)
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67 myengine.InitRenderer({matDef: shaderConfiguration})
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68 myengine.LoadScene(cube)
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70 var t: float32 = cpuTime()
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71 while myengine.UpdateInputs() and not KeyWasPressed(Escape):
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72 SetShaderGlobal(cube, "model", Translate(0'f32, 0'f32, 10'f32) * Rotate(t, Yf32))
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73 SetShaderGlobal(cube, "projection",
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74 Perspective(
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75 float32(PI / 4),
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76 float32(myengine.GetWindow().Size[0]) / float32(myengine.GetWindow().Size[1]),
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77 0.1'f32,
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78 100'f32
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79 )
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80 )
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81 t = cpuTime()
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82 myengine.RenderScene(cube)
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83
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84 myengine.Destroy()