Mercurial > games > semicongine

annotate examples/E03_hello_cube.nim @ 624:3f13de7d8ec4

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fix: API change for shader attributes
author Sam <sam@basx.dev>
date Sat, 29 Apr 2023 18:29:19 +0700
parents f41c1b78cf5b
children c33c8e156e3e
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1 #
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2 # TODO: Needs Depth-Buffer first!
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3 #
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4 #
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5 #
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6 #
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7 #
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8 #
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9
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10
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11 import std/times
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12 import std/strutils
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13
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14 import semicongine
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15
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16 const
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17 TopLeftFront = newVec3f(-0.5'f32, -0.5'f32, -0.5'f32)
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18 TopRightFront = newVec3f(0.5'f32, -0.5'f32, -0.5'f32)
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19 BottomRightFront = newVec3f(0.5'f32, 0.5'f32, -0.5'f32)
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20 BottomLeftFront = newVec3f(-0.5'f32, 0.5'f32, -0.5'f32)
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21 TopLeftBack = newVec3f(0.5'f32, -0.5'f32, 0.5'f32)
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22 TopRightBack = newVec3f(-0.5'f32, -0.5'f32, 0.5'f32)
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23 BottomRightBack = newVec3f(-0.5'f32, 0.5'f32, 0.5'f32)
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24 BottomLeftBack = newVec3f(0.5'f32, 0.5'f32, 0.5'f32)
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25 const
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26 cube_pos = @[
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27 TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front
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28 TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back
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29 TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left
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30 TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right
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31 TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top
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32 BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom
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33 ]
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34 cube_color = @[
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35 Rf32, Rf32, Rf32, Rf32,
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36 Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32,
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37 Gf32, Gf32, Gf32, Gf32,
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38 Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32,
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39 Bf32, Bf32, Bf32, Bf32,
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40 Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32,
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41 ]
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42 var
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43 tris: seq[array[3, uint16]]
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44 for i in 0'u16 ..< 6'u16:
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45 let off = i * 4
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46 tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
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47 tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
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48
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49 when isMainModule:
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50 var myengine = initEngine("Hello cube")
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51
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52 const
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53 vertexInput = @[
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54 attr[Vec3f]("position"),
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55 attr[Vec3f]("color", memoryPerformanceHint=PreferFastWrite),
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56 ]
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57 vertexOutput = @[attr[Vec3f]("outcolor")]
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58 uniforms = @[
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59 attr[Mat4]("projection"),
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60 attr[Mat4]("view"),
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61 attr[Mat4]("model"),
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62 ]
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63 fragOutput = @[attr[Vec4f]("color")]
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64 vertexCode = compileGlslShader(
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65 stage=VK_SHADER_STAGE_VERTEX_BIT,
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66 inputs=vertexInput,
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67 uniforms=uniforms,
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68 outputs=vertexOutput,
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69 main="""outcolor = color; gl_Position = (Uniforms.projection * Uniforms.view * Uniforms.model) * vec4(position, 1);"""
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70 )
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71 fragmentCode = compileGlslShader(
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72 stage=VK_SHADER_STAGE_FRAGMENT_BIT,
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73 inputs=vertexOutput,
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74 uniforms=uniforms,
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75 outputs=fragOutput,
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76 main="color = vec4(outcolor, 1);"
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77 )
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78 myengine.setRenderer(myengine.gpuDevice.simpleForwardRenderPass(vertexCode, fragmentCode))
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79 var
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80 projection = initShaderGlobal("projection", Unit4f32)
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81 view = initShaderGlobal("view", Unit4f32)
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82 model = initShaderGlobal("model", Unit4f32)
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83 cube = newEntity("cube", newMesh(positions=cube_pos, indices=tris, colors=cube_color))
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84 cube.components.add projection
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85 cube.components.add view
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86 cube.components.add model
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87 myengine.addScene(cube, vertexInput)
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88
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89 var t: float32 = cpuTime()
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90 while myengine.updateInputs() == Running and not myengine.keyWasPressed(Escape):
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91 setValue[Mat4](model.value, translate3d(0'f32, 0'f32, 10'f32) * rotate3d(t, Yf32))
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92 setValue[Mat4](
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93 projection.value,
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94 perspective(
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95 float32(PI / 4),
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96 float32(myengine.getWindow().size[0]) / float32(myengine.getWindow().size[0]),
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97 0.1'f32,
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98 100'f32
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99 )
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100 )
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101 t = cpuTime()
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102
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103 myengine.renderScene(cube)
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104
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105 myengine.destroy()