Mercurial > games > semicongine

annotate examples/E02_squares.nim @ 336:887ddc8d45fd

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did: update examples to work with improved scenegraph/material api, notice removed complexity!
author Sam <sam@basx.dev>
date Tue, 05 Sep 2023 00:28:35 +0700
parents b145a05c2459
children c66503386e8b
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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 ../src/semicongine
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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 inputs=[
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48 attr[Vec3f]("position"),
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49 attr[Vec4f]("color", memoryPerformanceHint=PreferFastWrite),
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50 attr[uint32]("index"),
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51 ],
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52 intermediates=[attr[Vec4f]("outcolor")],
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53 uniforms=[attr[float32]("time")],
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54 outputs=[attr[Vec4f]("color")],
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55 vertexCode="""
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56 float pos_weight = index / 100.0; // add some gamma correction?
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57 float t = sin(Uniforms.time * 0.5) * 0.5 + 0.5;
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58 float v = min(1, max(0, pow(pos_weight - t, 2)));
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59 v = pow(1 - v, 3000);
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60 outcolor = vec4(color.r, color.g, v * 0.5, 1);
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61 gl_Position = vec4(position, 1.0);
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62 """,
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63 fragmentCode="color = outcolor;",
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64 )
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65 var squaremesh = newMesh(
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66 positions=vertices,
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67 indices=indices,
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68 colors=colors,
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69 material=Material(name: "default")
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70 )
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71 squaremesh[].initVertexAttribute("index", iValues.toSeq)
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72
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73 var myengine = initEngine("Squares")
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74 myengine.initRenderer({"default": shaderConfiguration}.toTable)
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75
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76 var scene = Scene(name: "scene", meshes: @[squaremesh])
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77 scene.addShaderGlobal("time", 0.0'f32)
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78 myengine.addScene(scene)
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79 while myengine.updateInputs() == Running and not myengine.keyWasPressed(Escape):
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80 scene.setShaderGlobal("time", getShaderGlobal[float32](scene, "time") + 0.0005'f)
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81 myengine.renderScene(scene)
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83 myengine.destroy()