[orx-integral-image] Pad source image for npot inputs. Add demo

2024-06-28 11:12:38 +02:00
parent ab04e6b001
commit b1f2984b3e
4 changed files with 133 additions and 84 deletions
--- a/orx-integral-image/src/demo/kotlin/DemoFII01.kt
+++ b/orx-integral-image/src/demo/kotlin/DemoFII01.kt
@@ -0,0 +1,42 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.*
+import org.openrndr.extra.integralimage.*
+
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        val fii = FastIntegralImage()
+        val target = colorBuffer(width, height, 1.0, ColorFormat.RGBa, ColorType.FLOAT32)
+        val rt = renderTarget(width, height) {
+            colorBuffer()
+        }
+        extend {
+            drawer.clear(ColorRGBa.PINK)
+            drawer.isolatedWithTarget(rt) {
+                drawer.ortho(rt)
+                drawer.clear(ColorRGBa.BLACK)
+                drawer.fill = ColorRGBa.PINK.shade(1.0)
+                drawer.circle(mouse.position, 128.0)
+            }
+            fii.apply(rt.colorBuffer(0), target)
+
+            // -- here we sample from the integral image
+            drawer.shadeStyle = shadeStyle {
+                fragmentTransform = """
+                    float w = 64.0;
+                    vec2 step = 1.0 / vec2(textureSize(image, 0));
+                    vec4 t11 = texture(image, va_texCoord0 + step * vec2(w+1.0,w+1.0));
+                    vec4 t01 = texture(image, va_texCoord0 + step * vec2(-w,w+1.0));
+                    vec4 t00 = texture(image, va_texCoord0 + step * vec2(-w,-w));
+                    vec4 t10 = texture(image, va_texCoord0 + step * vec2(w+1.0,-w));
+                    x_fill = (t11 - t01 - t10 + t00) / ((2.0 * w +1.0) * (2.0 * w + 1.0));
+                """.trimIndent()
+            }
+            drawer.image(target)
+        }
+    }
+}