Improve color handling approach

src/graphics/graphics-library/frame-buffer/intermediate-frame-buffer.ts

@@ -1,33 +1,23 @@
-import { enableExtension } from '../helper/enable-extension';
+import { ColorTexture } from '../texture/color-texture';
+import { DistanceTexture } from '../texture/distance-texture';
+import { Texture } from '../texture/texture';
 import { UniversalRenderingContext } from '../universal-rendering-context';
 import { FrameBuffer } from './frame-buffer';
 
 /** @internal */
 export class IntermediateFrameBuffer extends FrameBuffer {
-  private frameTexture: WebGLTexture;
-  private floatEnabled = false;
-  private floatLinearEnabled = false;
+  private distanceTexture?: DistanceTexture;
+  private colorTexture: ColorTexture;
 
   constructor(gl: UniversalRenderingContext) {
     super(gl);
 
-    try {
-      enableExtension(gl, 'EXT_color_buffer_float');
-      this.floatEnabled = true;
+    this.colorTexture = new ColorTexture(gl);
 
-      enableExtension(gl, 'OES_texture_float_linear');
-      this.floatLinearEnabled = true;
-    } catch {
-      // it's okay
+    if (gl.isWebGL2) {
+      this.distanceTexture = new DistanceTexture(gl);
     }
 
-    // can only return null on lost context
-    gl.activeTexture(gl.TEXTURE0);
-
-    this.frameTexture = this.gl.createTexture()!;
-    this.configureTexture();
-
-    // can only return null on lost context
     this.frameBuffer = this.gl.createFramebuffer()!;
     this.configureFrameBuffer();
 
@@ -35,74 +25,48 @@ export class IntermediateFrameBuffer extends FrameBuffer {
   }
 
   public destroy(): void {
-    this.gl.deleteTexture(this.frameTexture);
+    if (this.distanceTexture) {
+      this.gl.deleteTexture(this.distanceTexture);
+    }
+    this.gl.deleteTexture(this.colorTexture);
+    this.gl.deleteFramebuffer(this.frameBuffer);
   }
 
-  public get colorTexture(): WebGLTexture {
-    return this.frameTexture;
+  public get textures(): Array<Texture> {
+    return this.distanceTexture
+      ? [this.distanceTexture, this.colorTexture]
+      : [this.colorTexture];
   }
 
   public setSize(): boolean {
     const hasChanged = super.setSize();
 
     if (hasChanged) {
-      this.bind();
-
-      this.gl.texImage2D(
-        this.gl.TEXTURE_2D,
-        0,
-        this.floatEnabled ? this.gl.RG16F : this.gl.RGB,
-        this.size.x,
-        this.size.y,
-        0,
-        this.floatEnabled ? this.gl.RG : this.gl.RGB,
-        this.floatEnabled ? this.gl.FLOAT : this.gl.UNSIGNED_BYTE,
-        null
-      );
+      this.colorTexture.setSize(this.size);
+      this.distanceTexture?.setSize(this.size);
     }
 
     return hasChanged;
   }
 
-  private bind() {
-    this.gl.activeTexture(this.gl.TEXTURE0);
-    this.gl.bindTexture(this.gl.TEXTURE_2D, this.frameTexture);
-  }
-
-  private configureTexture() {
-    this.bind();
-
-    this.gl.texParameteri(
-      this.gl.TEXTURE_2D,
-      this.gl.TEXTURE_MAG_FILTER,
-      this.floatLinearEnabled ? this.gl.LINEAR : this.gl.NEAREST
-    );
-    this.gl.texParameteri(
-      this.gl.TEXTURE_2D,
-      this.gl.TEXTURE_MIN_FILTER,
-      this.floatLinearEnabled ? this.gl.LINEAR : this.gl.NEAREST
-    );
-    this.gl.texParameteri(
-      this.gl.TEXTURE_2D,
-      this.gl.TEXTURE_WRAP_S,
-      this.gl.CLAMP_TO_EDGE
-    );
-    this.gl.texParameteri(
-      this.gl.TEXTURE_2D,
-      this.gl.TEXTURE_WRAP_T,
-      this.gl.CLAMP_TO_EDGE
-    );
-  }
-
   private configureFrameBuffer() {
     this.gl.bindFramebuffer(this.gl.FRAMEBUFFER, this.frameBuffer);
-    const attachmentPoint = this.gl.COLOR_ATTACHMENT0;
     this.gl.framebufferTexture2D(
       this.gl.FRAMEBUFFER,
-      attachmentPoint,
+      this.gl.COLOR_ATTACHMENT0,
       this.gl.TEXTURE_2D,
-      this.frameTexture,
+      this.colorTexture.colorTexture,
+      0
+    );
+
+    if (this.gl.isWebGL2) {
+      this.gl.framebufferTexture2D(
+        this.gl.FRAMEBUFFER,
+        this.gl.COLOR_ATTACHMENT1,
+        this.gl.TEXTURE_2D,
+        this.distanceTexture!.colorTexture,
         0
       );
     }
+  }
 }

src/graphics/graphics-library/program/uniform-array-autoscaling-program.ts

@@ -176,7 +176,7 @@ export class UniformArrayAutoScalingProgram implements IProgram {
           }(position, objectColor);
           
           color = mix(
-            objectColor / {paletteSize},
+            objectColor,
             color,
             ${
               descriptors[i].sdf?.isInverted

src/graphics/graphics-library/texture/color-texture.ts

@@ -0,0 +1,31 @@
+import { vec2 } from 'gl-matrix';
+import { UniversalRenderingContext } from '../universal-rendering-context';
+import { Texture } from './texture';
+import { FilteringOptions } from './texture-options';
+
+/** @internal */
+export class ColorTexture extends Texture {
+  public static readonly textureUnitId = 0;
+
+  constructor(gl: UniversalRenderingContext) {
+    super(gl, ColorTexture.textureUnitId, {
+      minFilter: FilteringOptions.LINEAR,
+      maxFilter: FilteringOptions.LINEAR,
+    });
+  }
+
+  public setSize(size: vec2) {
+    this.bind();
+    this.gl.texImage2D(
+      this.gl.TEXTURE_2D,
+      0,
+      this.gl.RGBA,
+      size.x,
+      size.y,
+      0,
+      this.gl.RGBA,
+      this.gl.UNSIGNED_BYTE,
+      null
+    );
+  }
+}

src/graphics/graphics-library/texture/distance-texture.ts

@@ -0,0 +1,53 @@
+import { vec2 } from 'gl-matrix';
+import { enableExtension } from '../helper/enable-extension';
+import { Texture } from './texture';
+import { FilteringOptions } from './texture-options';
+
+/** @internal */
+export class DistanceTexture extends Texture {
+  public static readonly textureUnitId = 1;
+
+  private floatEnabled = false;
+  private floatLinearEnabled = false;
+
+  constructor(gl: WebGL2RenderingContext) {
+    super(gl, DistanceTexture.textureUnitId, {
+      minFilter: FilteringOptions.NEAREST,
+      maxFilter: FilteringOptions.NEAREST,
+    });
+
+    try {
+      enableExtension(gl, 'EXT_color_buffer_float');
+      this.floatEnabled = true;
+
+      enableExtension(gl, 'OES_texture_float_linear');
+      this.floatLinearEnabled = true;
+    } catch {
+      // it's okay
+    }
+
+    if (this.floatLinearEnabled) {
+      this.setTextureOptions({
+        minFilter: FilteringOptions.LINEAR,
+        maxFilter: FilteringOptions.LINEAR,
+      });
+    }
+  }
+
+  public setSize(size: vec2) {
+    this.bind();
+    this.gl.texImage2D(
+      this.gl.TEXTURE_2D,
+      0,
+      this.floatEnabled ? (this.gl as WebGL2RenderingContext).R16F : this.gl.RGBA,
+      size.x,
+      size.y,
+      0,
+      this.floatEnabled ? (this.gl as WebGL2RenderingContext).RED : this.gl.RGBA,
+      this.floatEnabled
+        ? (this.gl as WebGL2RenderingContext).FLOAT
+        : this.gl.UNSIGNED_BYTE,
+      null
+    );
+  }
+}

src/graphics/graphics-library/texture/palette-texture.ts

@@ -4,8 +4,10 @@ import { Texture } from './texture';
 
 /** @internal */
 export class PaletteTexture extends Texture {
+  public static readonly textureUnitId = 2;
+
   constructor(gl: UniversalRenderingContext, private readonly paletteSize: number) {
-    super(gl, 1);
+    super(gl, PaletteTexture.textureUnitId);
   }
 
   public setPalette(colors: Array<vec3 | vec4>) {

src/graphics/graphics-library/texture/texture.ts

@@ -1,4 +1,3 @@
-import { UniversalRenderingContext } from '../universal-rendering-context';
 import { FilteringOptions, TextureOptions, WrapOptions } from './texture-options';
 
 /**
@@ -8,10 +7,17 @@ export class Texture {
   protected texture: WebGLTexture;
 
   constructor(
-    protected readonly gl: UniversalRenderingContext,
+    protected readonly gl: WebGLRenderingContext | WebGL2RenderingContext,
     private textureUnitId: number,
     textureOptionOverrides: Partial<TextureOptions> = {}
   ) {
+    this.texture = gl.createTexture()!;
+
+    this.bind();
+    this.setTextureOptions(textureOptionOverrides);
+  }
+
+  public setTextureOptions(textureOptionOverrides: Partial<TextureOptions> = {}) {
     const defaultTextureOptions: TextureOptions = {
       wrapS: WrapOptions.CLAMP_TO_EDGE,
       wrapT: WrapOptions.CLAMP_TO_EDGE,
@@ -24,14 +30,28 @@ export class Texture {
       ...textureOptionOverrides,
     };
 
-    this.texture = gl.createTexture()!;
-
     this.bind();
 
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl[textureOptions.wrapS]);
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl[textureOptions.wrapT]);
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl[textureOptions.minFilter]);
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl[textureOptions.maxFilter]);
+    this.gl.texParameteri(
+      this.gl.TEXTURE_2D,
+      this.gl.TEXTURE_WRAP_S,
+      this.gl[textureOptions.wrapS]
+    );
+    this.gl.texParameteri(
+      this.gl.TEXTURE_2D,
+      this.gl.TEXTURE_WRAP_T,
+      this.gl[textureOptions.wrapT]
+    );
+    this.gl.texParameteri(
+      this.gl.TEXTURE_2D,
+      this.gl.TEXTURE_MIN_FILTER,
+      this.gl[textureOptions.minFilter]
+    );
+    this.gl.texParameteri(
+      this.gl.TEXTURE_2D,
+      this.gl.TEXTURE_MAG_FILTER,
+      this.gl[textureOptions.maxFilter]
+    );
   }
 
   public get colorTexture(): WebGLTexture {

src/graphics/rendering/fps-autoscaler.ts

@@ -23,7 +23,7 @@ const settings = {
       finalRenderScale: 1.0,
     },
     {
-      distanceRenderScale: 1.0,
+      distanceRenderScale: 0.5,
       finalRenderScale: 1.0,
     },
   ],

src/graphics/rendering/render-pass/distance-render-pass.ts

@@ -15,8 +15,11 @@ export class DistanceRenderPass extends RenderPass {
     this.drawables.push(drawable);
   }
 
-  public render(commonUniforms: any, ...inputTextures: Array<Texture>) {
+  public render(commonUniforms: any, inputTextures: Array<Texture>) {
     this.frame.bindAndClear(inputTextures);
+    if (this.gl.isWebGL2) {
+      this.gl.drawBuffers([this.gl.COLOR_ATTACHMENT0, this.gl.COLOR_ATTACHMENT1]);
+    }
 
     const stepsInUV = 1 / this.tileMultiplier;
 

src/graphics/rendering/render-pass/lights-render-pass.ts

@@ -14,14 +14,7 @@ export class LightsRenderPass extends RenderPass {
     this.drawables.push(drawable);
   }
 
-  public render(
-    commonUniforms: any,
-    distanceTexture: WebGLTexture,
-    inputTextures: Array<Texture>
-  ) {
-    this.gl.activeTexture(this.gl.TEXTURE0);
-    this.gl.bindTexture(this.gl.TEXTURE_2D, distanceTexture);
-
+  public render(commonUniforms: any, inputTextures: Array<Texture>) {
     this.frame.bindAndClear(inputTextures);
 
     const tileCenterWorldCoordinates = vec2.transformMat2d(

src/graphics/rendering/renderer/renderer-implementation.ts

@@ -2,11 +2,14 @@ import { vec2 } from 'gl-matrix';
 import { Drawable } from '../../../drawables/drawable';
 import { DrawableDescriptor } from '../../../drawables/drawable-descriptor';
 import { LightDrawable } from '../../../drawables/lights/light-drawable';
+import { colorToString } from '../../../helper/color-to-string';
 import { msToString } from '../../../helper/ms-to-string';
 import { DefaultFrameBuffer } from '../../graphics-library/frame-buffer/default-frame-buffer';
 import { IntermediateFrameBuffer } from '../../graphics-library/frame-buffer/intermediate-frame-buffer';
 import { WebGlStopwatch } from '../../graphics-library/helper/stopwatch';
 import { ParallelCompiler } from '../../graphics-library/parallel-compiler';
+import { ColorTexture } from '../../graphics-library/texture/color-texture';
+import { DistanceTexture } from '../../graphics-library/texture/distance-texture';
 import { PaletteTexture } from '../../graphics-library/texture/palette-texture';
 import { Texture } from '../../graphics-library/texture/texture';
 import { TextureWithOptions } from '../../graphics-library/texture/texture-options';
@@ -56,12 +59,11 @@ export class RendererImplementation implements Renderer {
     },
     tileMultiplier: (v) => (this.distancePass.tileMultiplier = v),
     isWorldInverted: (v) => (this.distancePass.isWorldInverted = v),
-    backgroundColor: (v) => (this.uniformsProvider.backgroundColor = v),
     textures: (v: { [textureName: string]: TexImageSource | TextureWithOptions }) => {
       this.textures.forEach((t) => t.destroy());
       this.textures = [];
 
-      let id = 2;
+      let id = 3;
       for (const key in v) {
         this.uniformsProvider.textures[key] = id;
         let texture: Texture;
@@ -113,8 +115,6 @@ export class RendererImplementation implements Renderer {
       vec2.fromValues(canvas.clientWidth, canvas.clientHeight)
     );
 
-    this.queryPrecisions();
-
     this.autoscaler = new FpsAutoscaler({
       distanceRenderScale: (v) =>
         (this.distanceFieldFrameBuffer.renderScale = v as number),
@@ -143,6 +143,7 @@ export class RendererImplementation implements Renderer {
         compiler,
         {
           paletteSize: settings.paletteSize,
+          backgroundColor: colorToString(settings.backgroundColor),
         }
       )
     );
@@ -155,6 +156,7 @@ export class RendererImplementation implements Renderer {
         compiler,
         {
           shadowTraceCount: settings.shadowTraceCount.toString(),
+          backgroundColor: colorToString(settings.backgroundColor),
         }
       )
     );
@@ -162,7 +164,7 @@ export class RendererImplementation implements Renderer {
     await compiler.compilePrograms();
     await Promise.all(promises);
 
-    if (settings.enableStopwatch) {
+    if (settings.enableStopwatch && this.gl.isWebGL2) {
       try {
         this.stopwatch = new WebGlStopwatch(this.gl);
       } catch {
@@ -179,30 +181,6 @@ export class RendererImplementation implements Renderer {
     return Object.prototype.hasOwnProperty.call(descriptor, 'sdf');
   }
 
-  private queryPrecisions() {
-    const precisionToObject = (shader: GLenum, precision: GLenum) => {
-      const toExponent = (v: number): string => `2^${v}`;
-      const p = this.gl.getShaderPrecisionFormat(shader, precision)!;
-      return {
-        range: `[${toExponent(p.rangeMin)}, ${toExponent(p.rangeMax)}]`,
-        precision: toExponent(p.precision),
-      };
-    };
-
-    Insights.setValue('precisions', {
-      'vertex shader': {
-        'low float': precisionToObject(this.gl.VERTEX_SHADER, this.gl.LOW_FLOAT),
-        'medium float': precisionToObject(this.gl.VERTEX_SHADER, this.gl.MEDIUM_FLOAT),
-        'high float': precisionToObject(this.gl.VERTEX_SHADER, this.gl.HIGH_FLOAT),
-      },
-      'fragment shader': {
-        'low float': precisionToObject(this.gl.FRAGMENT_SHADER, this.gl.LOW_FLOAT),
-        'medium float': precisionToObject(this.gl.FRAGMENT_SHADER, this.gl.MEDIUM_FLOAT),
-        'high float': precisionToObject(this.gl.FRAGMENT_SHADER, this.gl.HIGH_FLOAT),
-      },
-    });
-  }
-
   public addDrawable(drawable: Drawable): void {
     if (
       RendererImplementation.hasSdf((drawable.constructor as typeof Drawable).descriptor)
@@ -235,20 +213,23 @@ export class RendererImplementation implements Renderer {
 
     const common = {
       // texture units
-      distanceTexture: 0,
-      palette: 1,
+      distanceTexture: DistanceTexture.textureUnitId,
+      colorTexture: ColorTexture.textureUnitId,
+      palette: PaletteTexture.textureUnitId,
 
       distanceNdcPixelSize: 2 / Math.max(...this.distanceFieldFrameBuffer.getSize()),
       shadingNdcPixelSize: 2 / Math.max(...this.lightingFrameBuffer.getSize()),
     };
 
-    this.distancePass.render(this.uniformsProvider.getUniforms(common), ...this.textures);
+    this.distancePass.render(this.uniformsProvider.getUniforms(common), [
+      this.palette,
+      ...this.textures,
+    ]);
 
     this.gl.enable(this.gl.BLEND);
     this.lightsPass.render(
       this.uniformsProvider.getUniforms(common),
-      this.distanceFieldFrameBuffer.colorTexture,
-      [this.palette]
+      this.distanceFieldFrameBuffer.textures
     );
     this.gl.disable(this.gl.BLEND);
 

src/graphics/rendering/settings/default-runtime-settings.ts

@@ -1,4 +1,4 @@
-import { vec3, vec4 } from 'gl-matrix';
+import { vec3 } from 'gl-matrix';
 import { RuntimeSettings } from './runtime-settings';
 
 /**
@@ -9,7 +9,6 @@ export const defaultRuntimeSettings: RuntimeSettings = {
   tileMultiplier: 8,
   isWorldInverted: false,
   lightCutoffDistance: 400,
-  backgroundColor: vec4.fromValues(1, 1, 1, 1),
   colorPalette: [],
   ambientLight: vec3.fromValues(0.25, 0.15, 0.25),
   textures: {},

src/graphics/rendering/settings/default-startup-settings.ts

@@ -1,3 +1,4 @@
+import { vec4 } from 'gl-matrix';
 import { StartupSettings } from './startup-settings';
 
 /**
@@ -7,5 +8,6 @@ export const defaultStartupSettings: StartupSettings = {
   shadowTraceCount: 16,
   paletteSize: 256,
   ignoreWebGL2: false,
+  backgroundColor: vec4.fromValues(1, 1, 1, 1),
   enableStopwatch: false,
 };

src/graphics/rendering/settings/runtime-settings.ts

@@ -38,18 +38,13 @@ export interface RuntimeSettings {
    */
   lightCutoffDistance: number;
 
-  /**
-   * The default background color of the scene, can have transparency.
-   */
-  backgroundColor: vec3 | vec4;
-
   /**
    * Its length should be less than the one specified in [[StartupSettings]].paletteSize.
    *
    * The possible colors for the objects. Each color is referenced by its index in the
    * palette.
    *
-   * Can have transparency.
+   * Can have transparency, but only if WebGL2 support is enabled.
    */
   colorPalette: Array<vec3 | vec4>;
 

src/graphics/rendering/settings/startup-settings.ts

@@ -1,3 +1,5 @@
+import { vec3, vec4 } from 'gl-matrix';
+
 /**
  * Interface for a configuration object containing the settings
  * that need to be given before shader compilation.
@@ -31,6 +33,11 @@ export interface StartupSettings {
    */
   paletteSize: number;
 
+  /**
+   * The default background color of the scene, can have transparency on every platform.
+   */
+  backgroundColor: vec3 | vec4;
+
   /**
    * When set to `true`, rendering will fall back to WebGL
    * even when WebGL2 is present.

src/graphics/rendering/shaders/distance-fs-100.glsl

@@ -6,17 +6,23 @@ uniform float maxMinDistance;
 uniform float distanceNdcPixelSize;
 varying vec2 position;
 
+uniform sampler2D palette;
+
+vec4 readFromPalette(int index) {
+  return texture2D(palette, vec2((float(index) + 0.5) / {paletteSize}, 0.5));
+}
+
+
 {macroDefinitions}
 
 {declarations}
 
 void main() {
-    float minDistance = maxMinDistance;
-    float color = 0.0;
-
-    float objectMinDistance, objectColor;
+    float minDistance = maxMinDistance, objectMinDistance;
+    vec4 color = {backgroundColor};
+    vec4 objectColor;
 
     {functionCalls}
     
-    gl_FragColor = vec4(minDistance * 8.0, color, 0.0, 1.0);
+    gl_FragColor = vec4(color.rgb, minDistance * 8.0);
 }

src/graphics/rendering/shaders/distance-fs.glsl

@@ -6,21 +6,28 @@ uniform float maxMinDistance;
 uniform float distanceNdcPixelSize;
 in vec2 position;
 
+uniform sampler2D palette;
+
 #define WEBGL2_IS_AVAILABLE
 
+vec4 readFromPalette(int index) {
+  return texture(palette, vec2((float(index) + 0.5) / {paletteSize}, 0.5));
+}
+
 {macroDefinitions}
 
 {declarations}
 
-out vec2 fragmentColor;
+layout(location = 0) out vec4 fragmentColor;
+layout(location = 1) out float distanceValue;
 
 void main() {
-    float minDistance = maxMinDistance;
-    float color = 0.0;
-
-    float objectMinDistance, objectColor;
+    float minDistance = maxMinDistance, objectMinDistance;
+    vec4 color = {backgroundColor};
+    vec4 objectColor;
 
     {functionCalls}
 
-    fragmentColor = vec2(minDistance, color);
+    distanceValue = minDistance;
+    fragmentColor = color;
 }

src/graphics/rendering/shaders/shading-fs-100.glsl

@@ -10,22 +10,20 @@ precision lowp float;
 uniform float shadingNdcPixelSize;
 uniform vec2 squareToAspectRatioTimes2;
 uniform vec3 ambientLight;
-uniform vec4 backgroundColor;
 
-uniform sampler2D distanceTexture;
-uniform sampler2D palette;
+uniform sampler2D colorTexture;
 
 varying vec2 position;
 varying vec2 uvCoordinates;
 
 float getDistance(in vec2 target, out vec4 color) {
-    vec4 values = texture2D(distanceTexture, target);
-    color = texture2D(palette, vec2(values[1], 0.0));
-    return values[0] / 8.0;
+    vec4 values = texture2D(colorTexture, target);
+    color = vec4(values.rgb, 1.0);
+    return values[3] / 8.0;
 }
 
 float getDistance(in vec2 target) {
-    return texture2D(distanceTexture, target)[0] / 8.0;
+    return texture2D(colorTexture, target)[3] / 8.0;
 }
 
 float shadowTransparency(float startingDistance, float lightCenterDistance, vec2 direction) {
@@ -122,13 +120,13 @@ void main() {
     #endif
     #endif
 
-    vec3 outsideColor = backgroundColor.rgb * lighting;
+    vec3 outsideColor = {backgroundColor}.rgb * lighting;
     vec3 insideColor = colorAtPosition * lightingInside;
 
     float edge = clamp(startingDistance / shadingNdcPixelSize, 0.0, 1.0);
     vec3 antialiasedColor = mix(insideColor, outsideColor, edge);
     gl_FragColor = vec4(
         antialiasedColor,
-        mix(rgbaColorAtPosition.a, backgroundColor.a, step(0.0, startingDistance))
+        rgbaColorAtPosition.a
     );
 }

src/graphics/rendering/shaders/shading-fs.glsl

@@ -8,23 +8,21 @@ precision lowp float;
 {macroDefinitions}
 
 uniform float shadingNdcPixelSize;
+uniform float distanceNdcPixelSize;
 uniform vec2 squareToAspectRatioTimes2;
 uniform vec3 ambientLight;
-uniform vec4 backgroundColor;
 
 uniform sampler2D distanceTexture;
-uniform sampler2D palette;
+uniform sampler2D colorTexture;
 
 in vec2 position;
 in vec2 uvCoordinates;
 
-float getDistance(in vec2 target, out vec4 color) {
-    vec4 values = texture(distanceTexture, target);
-    color = texture(palette, vec2(values[1], 0.0));
-    return values[0];
+vec4 getColor(vec2 target) {
+    return texture(colorTexture, target);
 }
 
-float getDistance(in vec2 target) {
+float getDistance(vec2 target) {
     return texture(distanceTexture, target)[0];
 }
 
@@ -83,13 +81,14 @@ float shadowTransparency(float startingDistance, float lightCenterDistance, vec2
 
 out vec4 fragmentColor;
 void main() {
-    vec4 rgbaColorAtPosition;
-    float startingDistance = getDistance(uvCoordinates, rgbaColorAtPosition);
-
+    vec4 rgbaColorAtPosition = getColor(uvCoordinates);
     vec3 colorAtPosition = rgbaColorAtPosition.rgb;
 
+    float startingDistance = getDistance(uvCoordinates);
+
+
     vec3 lighting = ambientLight;
-    vec3 lightingInside = lighting;
+    vec3 lightingInside = ambientLight;
     
     #ifdef CIRCLE_LIGHT_COUNT
     #if CIRCLE_LIGHT_COUNT > 0
@@ -142,13 +141,13 @@ void main() {
     #endif
     #endif
 
-    vec3 outsideColor = backgroundColor.rgb * lighting;
+    vec3 outsideColor = {backgroundColor}.rgb * lighting;
     vec3 insideColor = colorAtPosition * lightingInside * INTENSITY_INSIDE_RATIO;
     
     float edge = clamp(startingDistance / shadingNdcPixelSize, 0.0, 1.0);
     vec3 antialiasedColor = mix(insideColor, outsideColor, edge);
     fragmentColor = vec4(
         antialiasedColor,
-        mix(rgbaColorAtPosition.a, backgroundColor.a, step(0.0, startingDistance))
+        rgbaColorAtPosition.a
     );
 }

src/graphics/rendering/uniforms-provider.ts

@@ -1,10 +1,9 @@
-import { mat2d, vec2, vec3, vec4 } from 'gl-matrix';
+import { mat2d, vec2, vec3 } from 'gl-matrix';
 import { UniversalRenderingContext } from '../graphics-library/universal-rendering-context';
 
 /** @internal */
 export class UniformsProvider {
   public ambientLight!: vec3;
-  public _backgroundColor!: vec4;
   public textures: { [textureName: string]: number } = {};
 
   private scaleWorldLengthToNDC = 1;
@@ -21,7 +20,6 @@ export class UniformsProvider {
       ...uniforms,
       ...this.textures,
       ambientLight: this.ambientLight,
-      backgroundColor: this._backgroundColor,
       uvToWorld: this.uvToWorld,
       worldAreaInView: this.worldAreaInView,
       squareToAspectRatio: this.squareToAspectRatio,
@@ -31,14 +29,6 @@ export class UniformsProvider {
     };
   }
 
-  public set backgroundColor(value: vec3 | vec4) {
-    if (value.length === 3) {
-      this.backgroundColor = vec4.fromValues(value[0], value[1], value[2], 1);
-    } else {
-      this._backgroundColor = value as vec4;
-    }
-  }
-
   public getViewArea(): vec2 {
     return this.worldAreaInView;
   }

src/helper/code-for-color-access.ts

@@ -0,0 +1,13 @@
+import { vec3, vec4 } from 'gl-matrix';
+import { colorToString } from './color-to-string';
+
+/**
+ * @internal
+ */
+export const codeForColorAccess = (color: vec3 | vec4 | number): string => {
+  if (color instanceof Array || color instanceof Float32Array) {
+    return colorToString(color);
+  }
+
+  return `readFromPalette(${color})`;
+};

src/helper/color-to-string.ts

@@ -0,0 +1,7 @@
+import { vec3, vec4 } from 'gl-matrix';
+
+/**
+ * @internal
+ */
+export const colorToString = (v: vec3 | vec4): string =>
+  `vec4(${v[0]}, ${v[1]}, ${v[2]}, ${v.length > 3 ? v[3] : 1})`;

src/main.ts

@@ -40,9 +40,10 @@ applyArrayPlugins();
  * Example usage:
  *
  * ```js
- *  import { compile, Circle, CircleLight } from 'sdf-2d';
+ *  import { compile, hsl, CircleFactory, CircleLight } from 'sdf-2d';
  *
  *  const canvas = document.querySelector('canvas');
+ *  const Circle = CircleFactory(hsl(30, 66, 50));
  *  const renderer = await compile(canvas, [Circle.descriptor, CircleLight.descriptor]);
  * ```
  *
@@ -67,12 +68,19 @@ export * from './drawables/drawable';
 export * from './drawables/drawable-descriptor';
 export * from './drawables/lights/circle-light';
 export * from './drawables/lights/flashlight';
-export * from './drawables/shapes/circle';
-export * from './drawables/shapes/droplet';
+export * from './drawables/shapes/circle-factory';
+export * from './drawables/shapes/droplet-factory';
+export * from './drawables/shapes/inverted-tunnel-factory';
+export * from './drawables/shapes/meta-circle-factory';
+export * from './drawables/shapes/noisy-polygon-factory';
 export * from './drawables/shapes/polygon-factory';
-export * from './drawables/shapes/inverted-tunnel';
-export * from './drawables/shapes/meta-circle';
-export * from './drawables/shapes/rotated-rectangle';
+export * from './drawables/shapes/rotated-rectangle-factory';
 export * from './graphics/graphics-library/texture/texture-options';
 export * from './graphics/rendering/renderer/noise-renderer';
 export * from './graphics/rendering/renderer/renderer';
+export * from './helper/colors/hex';
+export * from './helper/colors/hsl';
+export * from './helper/colors/rgb';
+export * from './helper/colors/rgb255';
+export * from './helper/colors/rgba';
+export * from './helper/colors/rgba255';