[orx-shade-styles] convert to MPP

2021-06-29 13:55:16 +02:00
parent f85de6c163
commit bfd7414594
13 changed files with 196 additions and 23 deletions
--- a/orx-shade-styles/src/commonMain/kotlin/LinearGradient.kt
+++ b/orx-shade-styles/src/commonMain/kotlin/LinearGradient.kt
@@ -0,0 +1,103 @@
+package org.openrndr.extra.shadestyles
+
+import org.openrndr.color.*
+import org.openrndr.draw.ShadeStyle
+import org.openrndr.extra.parameters.ColorParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+import org.openrndr.extra.shaderphrases.preprocess
+import org.openrndr.extras.color.phrases.ColorPhraseBook
+import org.openrndr.extras.color.spaces.ColorOKLABa
+import org.openrndr.math.CastableToVector4
+import org.openrndr.math.Vector2
+import kotlin.reflect.KClass
+
+@Description("Linear gradient")
+open class LinearGradientBase<C>(
+    color0: C,
+    color1: C,
+    offset: Vector2 = Vector2.ZERO,
+    rotation: Double = 0.0,
+    exponent: Double = 1.0
+) : ShadeStyle()
+        where C : ConvertibleToColorRGBa, C : AlgebraicColor<C>, C: CastableToVector4 {
+
+    @ColorParameter("start color", order = 0)
+    var color0: C by Parameter()
+
+    @ColorParameter("end color", order = 1)
+    var color1: C by Parameter()
+    var offset: Vector2 by Parameter()
+
+    @DoubleParameter("rotation", -180.0, 180.0, order = 2)
+    var rotation: Double by Parameter()
+
+    @DoubleParameter("exponent", 0.01, 10.0, order = 3)
+    var exponent: Double by Parameter()
+
+    init {
+        ColorPhraseBook.register()
+        this.color0 = color0
+        this.color1 = color1
+        this.offset = offset
+        this.rotation = rotation
+        this.exponent = exponent
+
+        fragmentPreamble = """
+            |#pragma import color.oklab_to_linear_rgb
+            |#pragma import color.linear_rgb_to_srgb""".trimMargin().preprocess()
+        fragmentTransform = """
+            vec2 coord = (c_boundsPosition.xy - 0.5 + p_offset);
+
+            float cr = cos(radians(p_rotation));
+            float sr = sin(radians(p_rotation));
+            mat2 rm = mat2(cr, -sr, sr, cr);
+            vec2 rc = rm * coord;
+            float f = clamp(rc.y + 0.5, 0.0, 1.0);            
+                
+            vec4 color0 = p_color0;
+            vec4 color1 = p_color1; 
+
+            vec4 gradient = mix(color0, color1, pow(f, p_exponent));
+            ${generateColorTransform(color0::class)}
+            x_fill *= gradient;
+        """
+    }
+}
+
+class LinearGradient(
+    color0: ColorRGBa,
+    color1: ColorRGBa,
+    offset: Vector2 = Vector2.ZERO,
+    rotation: Double = 0.0,
+    exponent: Double = 1.0
+): LinearGradientBase<ColorRGBa>(color0, color1, offset, rotation, exponent)
+
+class LinearGradientOKLab(
+    color0: ColorOKLABa,
+    color1: ColorOKLABa,
+    offset: Vector2 = Vector2.ZERO,
+    rotation: Double = 0.0,
+    exponent: Double = 1.0
+): LinearGradientBase<ColorOKLABa>(color0, color1, offset, rotation, exponent)
+
+
+fun linearGradient(
+    color0: ColorRGBa,
+    color1: ColorRGBa,
+    offset: Vector2 = Vector2.ZERO,
+    rotation: Double = 0.0,
+    exponent: Double = 1.0
+): LinearGradient {
+    return LinearGradient(color0, color1, offset, rotation, exponent)
+}
+
+fun linearGradient(
+    color0: ColorOKLABa,
+    color1: ColorOKLABa,
+    offset: Vector2 = Vector2.ZERO,
+    rotation: Double = 0.0,
+    exponent: Double = 1.0
+): LinearGradientOKLab {
+    return LinearGradientOKLab(color0, color1, offset, rotation, exponent)
+}