{
  "version": 3,
  "sources": ["../../../../../src/lib/ui/components/Minimap/minimap-webgl-setup.ts"],
  "sourcesContent": ["import { roundedRectangleDataSize } from './minimap-webgl-shapes'\n\nexport function setupWebGl(canvas: HTMLCanvasElement | null) {\n\tif (!canvas) throw new Error('Canvas element not found')\n\n\tconst context = canvas.getContext('webgl2', {\n\t\tpremultipliedAlpha: false,\n\t})\n\tif (!context) throw new Error('Failed to get webgl2 context')\n\n\tconst vertexShaderSourceCode = `#version 300 es\n  precision mediump float;\n  \n  in vec2 shapeVertexPosition;\n\n\tuniform vec4 canvasPageBounds;\n\n\t// taken (with thanks) from\n\t// https://webglfundamentals.org/webgl/lessons/webgl-2d-matrices.html\n  void main() {\n\t\t// convert the position from pixels to 0.0 to 1.0\n\t\tvec2 zeroToOne = (shapeVertexPosition - canvasPageBounds.xy) / canvasPageBounds.zw;\n\t\n\t\t// convert from 0->1 to 0->2\n\t\tvec2 zeroToTwo = zeroToOne * 2.0;\n\t\n\t\t// convert from 0->2 to -1->+1 (clipspace)\n\t\tvec2 clipSpace = zeroToTwo - 1.0;\n\t\n\t\tgl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);\n  }`\n\n\tconst vertexShader = context.createShader(context.VERTEX_SHADER)\n\tif (!vertexShader) {\n\t\tthrow new Error('Failed to create vertex shader')\n\t}\n\tcontext.shaderSource(vertexShader, vertexShaderSourceCode)\n\tcontext.compileShader(vertexShader)\n\tif (!context.getShaderParameter(vertexShader, context.COMPILE_STATUS)) {\n\t\tthrow new Error('Failed to compile vertex shader')\n\t}\n\n\tconst fragmentShaderSourceCode = `#version 300 es\n  precision mediump float;\n  \n\tuniform vec4 fillColor;\n  out vec4 outputColor;\n\n  void main() {\n\toutputColor = fillColor;\n  }`\n\n\tconst fragmentShader = context.createShader(context.FRAGMENT_SHADER)\n\tif (!fragmentShader) {\n\t\tthrow new Error('Failed to create fragment shader')\n\t}\n\tcontext.shaderSource(fragmentShader, fragmentShaderSourceCode)\n\tcontext.compileShader(fragmentShader)\n\tif (!context.getShaderParameter(fragmentShader, context.COMPILE_STATUS)) {\n\t\tthrow new Error('Failed to compile fragment shader')\n\t}\n\n\tconst program = context.createProgram()\n\tif (!program) {\n\t\tthrow new Error('Failed to create program')\n\t}\n\tcontext.attachShader(program, vertexShader)\n\tcontext.attachShader(program, fragmentShader)\n\tcontext.linkProgram(program)\n\tif (!context.getProgramParameter(program, context.LINK_STATUS)) {\n\t\tthrow new Error('Failed to link program')\n\t}\n\tcontext.useProgram(program)\n\n\tconst shapeVertexPositionAttributeLocation = context.getAttribLocation(\n\t\tprogram,\n\t\t'shapeVertexPosition'\n\t)\n\tif (shapeVertexPositionAttributeLocation < 0) {\n\t\tthrow new Error('Failed to get shapeVertexPosition attribute location')\n\t}\n\tcontext.enableVertexAttribArray(shapeVertexPositionAttributeLocation)\n\n\tconst canvasPageBoundsLocation = context.getUniformLocation(program, 'canvasPageBounds')\n\tconst fillColorLocation = context.getUniformLocation(program, 'fillColor')\n\n\tconst selectedShapesBuffer = context.createBuffer()\n\tif (!selectedShapesBuffer) throw new Error('Failed to create buffer')\n\n\tconst unselectedShapesBuffer = context.createBuffer()\n\tif (!unselectedShapesBuffer) throw new Error('Failed to create buffer')\n\n\treturn {\n\t\tcontext,\n\t\tselectedShapes: allocateBuffer(context, 1024),\n\t\tunselectedShapes: allocateBuffer(context, 4096),\n\t\tviewport: allocateBuffer(context, roundedRectangleDataSize),\n\t\tcollaborators: allocateBuffer(context, 1024),\n\n\t\tprepareTriangles(stuff: BufferStuff, len: number) {\n\t\t\tcontext.bindBuffer(context.ARRAY_BUFFER, stuff.buffer)\n\t\t\tcontext.bufferData(context.ARRAY_BUFFER, stuff.vertices, context.STATIC_DRAW, 0, len)\n\t\t\tcontext.enableVertexAttribArray(shapeVertexPositionAttributeLocation)\n\t\t\tcontext.vertexAttribPointer(\n\t\t\t\tshapeVertexPositionAttributeLocation,\n\t\t\t\t2,\n\t\t\t\tcontext.FLOAT,\n\t\t\t\tfalse,\n\t\t\t\t0,\n\t\t\t\t0\n\t\t\t)\n\t\t},\n\n\t\tdrawTrianglesTransparently(len: number) {\n\t\t\tcontext.enable(context.BLEND)\n\t\t\tcontext.blendFunc(context.SRC_ALPHA, context.ONE_MINUS_SRC_ALPHA)\n\t\t\tcontext.drawArrays(context.TRIANGLES, 0, len / 2)\n\t\t\tcontext.disable(context.BLEND)\n\t\t},\n\n\t\tdrawTriangles(len: number) {\n\t\t\tcontext.drawArrays(context.TRIANGLES, 0, len / 2)\n\t\t},\n\n\t\tsetFillColor(color: Float32Array) {\n\t\t\tcontext.uniform4fv(fillColorLocation, color)\n\t\t},\n\n\t\tsetCanvasPageBounds(bounds: Float32Array) {\n\t\t\tcontext.uniform4fv(canvasPageBoundsLocation, bounds)\n\t\t},\n\t}\n}\n\nexport type BufferStuff = ReturnType<typeof allocateBuffer>\n\nfunction allocateBuffer(context: WebGL2RenderingContext, size: number) {\n\tconst buffer = context.createBuffer()\n\tif (!buffer) throw new Error('Failed to create buffer')\n\treturn { buffer, vertices: new Float32Array(size) }\n}\n\nexport function appendVertices(bufferStuff: BufferStuff, offset: number, data: Float32Array) {\n\tlet len = bufferStuff.vertices.length\n\twhile (len < offset + data.length) {\n\t\tlen *= 2\n\t}\n\tif (len != bufferStuff.vertices.length) {\n\t\tconst newVertices = new Float32Array(len)\n\t\tnewVertices.set(bufferStuff.vertices)\n\t\tbufferStuff.vertices = newVertices\n\t}\n\n\tbufferStuff.vertices.set(data, offset)\n}\n"],
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