Mercurial > games > semicongine

annotate examples/E03_hello_cube.nim @ 670:881a5c9ea50f

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next version, because we got most low-level stuff, at least in a crappy version
author Sam <sam@basx.dev>
date Tue, 09 May 2023 01:37:46 +0700
parents e85f54b88afb
children d84b2e88776a
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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
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13 import semicongine
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14
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15 const
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16 TopLeftFront = newVec3f(-0.5'f32, -0.5'f32, -0.5'f32)
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17 TopRightFront = newVec3f(0.5'f32, -0.5'f32, -0.5'f32)
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18 BottomRightFront = newVec3f(0.5'f32, 0.5'f32, -0.5'f32)
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19 BottomLeftFront = newVec3f(-0.5'f32, 0.5'f32, -0.5'f32)
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20 TopLeftBack = newVec3f(0.5'f32, -0.5'f32, 0.5'f32)
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21 TopRightBack = newVec3f(-0.5'f32, -0.5'f32, 0.5'f32)
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22 BottomRightBack = newVec3f(-0.5'f32, 0.5'f32, 0.5'f32)
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23 BottomLeftBack = newVec3f(0.5'f32, 0.5'f32, 0.5'f32)
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24 const
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25 cube_pos = @[
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26 TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front
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27 TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back
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28 TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left
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29 TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right
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30 TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top
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31 BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom
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32 ]
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33 cube_color = @[
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34 Rf32, Rf32, Rf32, Rf32,
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35 Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32,
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36 Gf32, Gf32, Gf32, Gf32,
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37 Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32,
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38 Bf32, Bf32, Bf32, Bf32,
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39 Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32,
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40 ]
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41 var
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42 tris: seq[array[3, uint16]]
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43 for i in 0'u16 ..< 6'u16:
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44 let off = i * 4
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45 tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
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46 tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
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47
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48 when isMainModule:
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49 var myengine = initEngine("Hello cube")
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50
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51 const
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52 vertexInput = @[
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53 attr[Vec3f]("position"),
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54 attr[Vec3f]("color", memoryPerformanceHint=PreferFastWrite),
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55 ]
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56 vertexOutput = @[attr[Vec3f]("outcolor")]
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57 uniforms = @[
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58 attr[Mat4]("projection"),
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59 attr[Mat4]("view"),
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60 attr[Mat4]("model"),
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61 ]
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62 fragOutput = @[attr[Vec4f]("color")]
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63 vertexCode = compileGlslShader(
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64 stage=VK_SHADER_STAGE_VERTEX_BIT,
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65 inputs=vertexInput,
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66 uniforms=uniforms,
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67 outputs=vertexOutput,
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68 main="""outcolor = color; gl_Position = (Uniforms.projection * Uniforms.view * Uniforms.model) * vec4(position, 1);"""
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69 )
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70 fragmentCode = compileGlslShader(
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71 stage=VK_SHADER_STAGE_FRAGMENT_BIT,
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72 inputs=vertexOutput,
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73 uniforms=uniforms,
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74 outputs=fragOutput,
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75 main="color = vec4(outcolor, 1);"
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76 )
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77 myengine.setRenderer(myengine.gpuDevice.simpleForwardRenderPass(vertexCode, fragmentCode))
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78 var cube = newScene("scene", newEntity("cube", newMesh(positions=cube_pos, indices=tris, colors=cube_color)))
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79 cube.addShaderGlobal("projection", Unit4f32)
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80 cube.addShaderGlobal("view", Unit4f32)
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81 cube.addShaderGlobal("model", Unit4f32)
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82 myengine.addScene(cube, vertexInput)
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83
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84 var t: float32 = cpuTime()
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85 while myengine.updateInputs() == Running and not myengine.keyWasPressed(Escape):
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86 setShaderGlobal(cube, "model", translate3d(0'f32, 0'f32, 10'f32) * rotate3d(t, Yf32))
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87 setShaderGlobal(cube, "projection",
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88 perspective(
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89 float32(PI / 4),
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90 float32(myengine.getWindow().size[0]) / float32(myengine.getWindow().size[0]),
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91 0.1'f32,
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92 100'f32
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93 )
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94 )
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95 t = cpuTime()
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96
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97 myengine.renderScene(cube)
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98
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99 myengine.destroy()