Mercurial > games > semicongine

annotate examples/E02_squares.nim @ 1163:438d32d8b14f compiletime-tests

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add: more static compilation stuff, code is getting a bit crazy, but also super nice API
author sam <sam@basx.dev>
date Fri, 21 Jun 2024 00:14:43 +0700
parents 5934c5615f13
children
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1 import std/sequtils
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2 import std/tables
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3 import std/random
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4
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5 import ../semicongine
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6
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7
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8 when isMainModule:
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9 randomize()
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10 const
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11 COLUMNS = 10
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12 ROWS = 10
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13 WIDTH = 2'f32 / COLUMNS
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14 HEIGHT = 2'f32 / ROWS
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15 var
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16 vertices: array[COLUMNS * ROWS * 4, Vec3f]
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17 colors: array[COLUMNS * ROWS * 4, Vec4f]
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18 iValues: array[COLUMNS * ROWS * 4, uint32]
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19 indices: array[COLUMNS * ROWS * 2, array[3, uint16]]
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20
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21 for row in 0 ..< ROWS:
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22 for col in 0 ..< COLUMNS:
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23 let
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24 y: float32 = (row * 2 / COLUMNS) - 1
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25 x: float32 = (col * 2 / ROWS) - 1
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26 color = NewVec4f((x + 1) / 2, (y + 1) / 2, 0, 1)
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27 squareIndex = row * COLUMNS + col
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28 vertIndex = squareIndex * 4
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29 vertices[vertIndex + 0] = NewVec3f(x, y)
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30 vertices[vertIndex + 1] = NewVec3f(x + WIDTH, y)
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31 vertices[vertIndex + 2] = NewVec3f(x + WIDTH, y + HEIGHT)
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32 vertices[vertIndex + 3] = NewVec3f(x, y + HEIGHT)
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33 colors[vertIndex + 0] = color
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34 colors[vertIndex + 1] = color
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35 colors[vertIndex + 2] = color
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36 colors[vertIndex + 3] = color
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37 iValues[vertIndex + 0] = uint32(squareIndex)
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38 iValues[vertIndex + 1] = uint32(squareIndex)
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39 iValues[vertIndex + 2] = uint32(squareIndex)
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40 iValues[vertIndex + 3] = uint32(squareIndex)
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41 indices[squareIndex * 2 + 0] = [uint16(vertIndex + 0), uint16(vertIndex + 1), uint16(vertIndex + 2)]
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42 indices[squareIndex * 2 + 1] = [uint16(vertIndex + 2), uint16(vertIndex + 3), uint16(vertIndex + 0)]
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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 Attr[uint32]("index"),
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52 ],
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53 intermediates = [Attr[Vec4f]("outcolor")],
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54 uniforms = [Attr[float32]("time")],
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55 outputs = [Attr[Vec4f]("color")],
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56 vertexCode = """
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57 float pos_weight = index / 100.0; // add some gamma correction?
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58 float t = sin(Uniforms.time * 0.5) * 0.5 + 0.5;
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59 float v = min(1, max(0, pow(pos_weight - t, 2)));
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60 v = pow(1 - v, 3000);
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61 outcolor = vec4(color.r, color.g, v * 0.5, 1);
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62 gl_Position = vec4(position, 1.0);
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63 """,
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64 fragmentCode = "color = outcolor;",
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65 )
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66 let matDef = MaterialType(name: "default", vertexAttributes: {
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67 "position": Vec3F32,
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68 "color": Vec4F32,
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69 "index": UInt32,
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70 }.toTable)
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71 var squaremesh = NewMesh(
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72 positions = vertices,
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73 indices = indices,
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74 colors = colors,
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75 )
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76 squaremesh[].InitVertexAttribute("index", iValues.toSeq)
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77 squaremesh.material = matDef.InitMaterialData(name = "default")
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78
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79 var myengine = InitEngine("Squares")
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80 myengine.InitRenderer({matDef: shaderConfiguration})
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81
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82 var scene = Scene(name: "scene", meshes: @[squaremesh])
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83 scene.AddShaderGlobal("time", 0.0'f32)
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84 myengine.LoadScene(scene)
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85 while myengine.UpdateInputs() and not KeyWasPressed(Escape):
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86 scene.SetShaderGlobal("time", GetShaderGlobal[float32](scene, "time") + 0.0005'f)
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87 myengine.RenderScene(scene)
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88
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89 myengine.Destroy()