Mercurial > games > semicongine
annotate examples/E03_hello_cube.nim @ 1132:7f2c477ae1f4
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| author | sam <sam@basx.dev> |
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| date | Thu, 23 May 2024 02:26:37 +0700 |
| parents | d6c27f0ed3e4 |
| children | 71315636ba82 |
| rev | line source |
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1 import std/tables |
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2 import std/times |
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3 |
| 1027 | 4 import ../semicongine |
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5 |
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6 const |
| 602 | 7 TopLeftFront = newVec3f(-0.5'f32, -0.5'f32, -0.5'f32) |
| 8 TopRightFront = newVec3f(0.5'f32, -0.5'f32, -0.5'f32) | |
| 9 BottomRightFront = newVec3f(0.5'f32, 0.5'f32, -0.5'f32) | |
| 10 BottomLeftFront = newVec3f(-0.5'f32, 0.5'f32, -0.5'f32) | |
| 11 TopLeftBack = newVec3f(0.5'f32, -0.5'f32, 0.5'f32) | |
| 12 TopRightBack = newVec3f(-0.5'f32, -0.5'f32, 0.5'f32) | |
| 13 BottomRightBack = newVec3f(-0.5'f32, 0.5'f32, 0.5'f32) | |
| 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 = @[ |
| 1027 | 17 TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front |
| 18 TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back | |
| 19 TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left | |
| 20 TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right | |
| 21 TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top | |
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22 BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom |
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23 ] |
| 671 | 24 R = newVec4f(1, 0, 0, 1) |
| 25 G = newVec4f(0, 1, 0, 1) | |
| 26 B = newVec4f(0, 0, 1, 1) | |
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27 cube_color = @[ |
| 671 | 28 R, R, R, R, |
| 29 R * 0.5'f32, R * 0.5'f32, R * 0.5'f32, R * 0.5'f32, | |
| 30 G, G, G, G, | |
| 31 G * 0.5'f32, G * 0.5'f32, G * 0.5'f32, G * 0.5'f32, | |
| 32 B, B, B, B, | |
| 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: |
| 602 | 43 var myengine = initEngine("Hello cube") |
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44 |
| 602 | 45 const |
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46 shaderConfiguration = createShaderConfiguration( |
| 1027 | 47 name = "default shader", |
| 48 inputs = [ | |
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49 attr[Vec3f]("position"), |
| 1027 | 50 attr[Vec4f]("color", memoryPerformanceHint = PreferFastWrite), |
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51 ], |
| 1027 | 52 intermediates = [attr[Vec4f]("outcolor")], |
| 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 ], |
| 1027 | 58 outputs = [attr[Vec4f]("color")], |
| 59 vertexCode = """outcolor = color; gl_Position = (Uniforms.projection * Uniforms.view * Uniforms.model) * vec4(position, 1);""", | |
| 60 fragmentCode = "color = outcolor;", | |
| 602 | 61 ) |
| 1027 | 62 var matDef = MaterialType(name: "default material", vertexAttributes: {"position": Vec3F32, "color": Vec4F32}.toTable) |
| 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) |
| 1027 | 67 myengine.initRenderer({matDef: shaderConfiguration}) |
| 68 myengine.loadScene(cube) | |
| 602 | 69 |
| 70 var t: float32 = cpuTime() | |
| 1027 | 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", |
| 602 | 74 perspective( |
| 75 float32(PI / 4), | |
| 1027 | 76 float32(myengine.GetWindow().size[0]) / float32(myengine.GetWindow().size[1]), |
| 602 | 77 0.1'f32, |
| 78 100'f32 | |
| 79 ) | |
| 80 ) | |
| 81 t = cpuTime() | |
| 82 myengine.renderScene(cube) | |
| 83 | |
| 84 myengine.destroy() |