Mercurial > games > semicongine
annotate examples/hello_triangle.nim @ 32:9edca5dc4e93
add: working implementation of uniforms
| author | Sam <sam@basx.dev> |
|---|---|
| date | Sat, 14 Jan 2023 23:34:50 +0700 |
| parents | b1b05d4efb52 |
| children | 94c38e4b5782 |
| rev | line source |
|---|---|
| 28 | 1 import std/times |
| 32 | 2 import std/strutils |
| 3 import std/enumerate | |
| 28 | 4 |
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5 import zamikongine/engine |
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6 import zamikongine/math/vector |
| 32 | 7 import zamikongine/math/matrix |
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8 import zamikongine/vertex |
| 32 | 9 import zamikongine/descriptor |
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10 import zamikongine/mesh |
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11 import zamikongine/thing |
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12 import zamikongine/shader |
| 28 | 13 import zamikongine/buffer |
| 0 | 14 |
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15 type |
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16 # define type of vertex |
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17 VertexDataA = object |
| 32 | 18 position: PositionAttribute[Vec2[float32]] |
| 19 color: ColorAttribute[Vec3[float32]] | |
| 20 Uniforms = object | |
| 21 mat: Descriptor[Mat44[float32]] | |
| 22 dt: Descriptor[float32] | |
| 23 | |
| 24 var pipeline: RenderPipeline[VertexDataA, Uniforms] | |
| 28 | 25 |
| 32 | 26 var pos = 0'f32; |
| 27 var uniforms = Uniforms( | |
| 28 mat: Descriptor[Mat44[float32]](value: Unit44f32), | |
| 29 dt: Descriptor[float32](value: 0'f32), | |
| 30 ) | |
| 31 var scaledir = 1'f32 | |
| 32 proc globalUpdate(engine: var Engine, dt: float32) = | |
| 33 uniforms.mat.value = uniforms.mat.value * scale3d(1 + scaledir * dt, 1 + scaledir * dt, 0'f32) | |
| 34 if uniforms.mat.value[0, 0] > 2'f32 or uniforms.mat.value[0, 0] < 0.5'f32: | |
| 35 scaledir = - scaledir | |
| 36 for buffer in pipeline.uniformBuffers: | |
| 37 buffer.updateData(uniforms) | |
| 38 echo uniforms.mat.value | |
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39 |
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40 # vertex data (types must match the above VertexAttributes) |
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41 const |
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42 triangle_pos = @[ |
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43 Vec2([ 0.0'f32, -0.5'f32]), |
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44 Vec2([ 0.5'f32, 0.5'f32]), |
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45 Vec2([-0.5'f32, 0.5'f32]), |
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46 ] |
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47 triangle_color = @[ |
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48 Vec3([1.0'f32, 0.0'f32, 0.0'f32]), |
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49 Vec3([0.0'f32, 1.0'f32, 0.0'f32]), |
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50 Vec3([0.0'f32, 0.0'f32, 1.0'f32]), |
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51 ] |
| 0 | 52 |
| 53 when isMainModule: | |
| 28 | 54 var myengine = igniteEngine("Hello triangle") |
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55 |
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56 # build a mesh |
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57 var trianglemesh = new Mesh[VertexDataA] |
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58 trianglemesh.vertexData = VertexDataA( |
| 32 | 59 position: PositionAttribute[Vec2[float32]](data: triangle_pos), |
| 60 color: ColorAttribute[Vec3[float32]](data: triangle_color), | |
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61 ) |
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62 # build a single-object scene graph |
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63 var triangle = new Thing |
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64 # add the triangle mesh to the object |
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65 triangle.parts.add trianglemesh |
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Sam <sam@basx.dev>
parents:
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66 |
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67 # upload data, prepare shaders, etc |
| 32 | 68 const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]( |
| 69 # have 1 at: | |
| 70 # [2][0] [0][3] | |
| 71 # "out_position = vec4(in_position[0] + uniforms.mat[0][0], in_position[1] + uniforms.mat[0][0], 0, 1);" | |
| 72 "out_position = uniforms.mat * vec4(in_position, 0, 1);" | |
| 73 # "out_position = vec4(in_position, 0, 1);" | |
| 74 ) | |
| 75 const fragmentShader = generateFragmentShaderCode[VertexDataA]() | |
| 76 static: | |
| 77 echo "--------------" | |
| 78 for (i, line) in enumerate(vertexShader.splitLines()): | |
| 79 echo $(i + 1) & " " & line | |
| 80 echo "--------------" | |
| 81 echo fragmentShader | |
| 82 echo "--------------" | |
| 83 pipeline = setupPipeline[VertexDataA, Uniforms, uint16]( | |
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Sam <sam@basx.dev>
parents:
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84 myengine, |
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85 triangle, |
| 32 | 86 vertexShader, |
| 87 fragmentShader | |
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Sam <sam@basx.dev>
parents:
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88 ) |
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89 # show something |
| 28 | 90 myengine.run(pipeline, globalUpdate) |
| 91 pipeline.trash() | |
| 0 | 92 myengine.trash() |