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featurea game engine minimalism demonstration
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| @file:Dependency("featurea:app:1.0") | |
| @file:Dependency("featurea:graphics:1.0") | |
| @file:Dependency("featurea:input:1.0") | |
| @file:Dependency("featurea:pbr:1.0") | |
| package game | |
| import featurea.app.* | |
| import featurea.graphics.* | |
| import featurea.input.* | |
| import featurea.pbr.* | |
| import featurea.runtime.* | |
| import featurea.utils.Color.orangeColor | |
| val artifact = Artifact { | |
| include(featurea.graphics.artifact) | |
| include(featurea.input.artifact) | |
| } | |
| fun bootstrap(init: Runnable) = runApplication(include = game.artifact, init) | |
| fun main() = bootstrap { | |
| val app: Application = import() | |
| val gl: Opengl = import() | |
| val graphics: Graphics = import() | |
| val loader: Loader = import() | |
| app.delegate = ApplicationDelegate { | |
| init { | |
| loader.load(marioPng) | |
| loader.load(pbrShader) | |
| loader.load(simpleShader) | |
| loader.load(sponzaGlb) | |
| loader.load(quadIndices) | |
| loader.load(quadVertices) | |
| } | |
| update { | |
| graphics.clear(orangeColor) | |
| // mario.png | |
| graphics.drawImage(marioPng, x = 30, y = 30, width = 100, height = 100) | |
| // simple.shader | |
| gl.useProgram(simpleShader) | |
| gl.useBuffer(quadVertices) | |
| gl.uniforms["time"] = app.time | |
| gl.drawTriangles(quadIndices) | |
| // sponza.glb | |
| gl.useProgram(pbrShader) | |
| gl.drawModel(sponzaGlb) | |
| } | |
| } | |
| } | |
| /*content*/ | |
| const val marioPng = "https://images.com/mario.png" | |
| const val sponzaGlb ="https://models.com/sponza.glb" | |
| val quadVertices: VertexBuffer = VertexBuffer( | |
| -1.0f, 1.0f, | |
| -1.0f, -1.0f, | |
| 1.0f, -1.0f, | |
| 1.0f, 1.0f, | |
| ) | |
| val quadIndices: IndexBuffer = IndexBuffer( | |
| 0, 1, 2, | |
| 1, 2, 3, | |
| ) | |
| const val simpleShader: Program = Program(""" | |
| #shader vertex(vec2 position) | |
| void main() { | |
| outPosition = vec4(position, 0.0, 1.0) | |
| } | |
| #shader pixel | |
| float time; | |
| void main() { | |
| outColor = vec4(0.2, sin(totalTime) * 0.5 + 0.5, 0.8, 1.0); | |
| } | |
| """) |
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