[openrndr-demos] Add DemoTessShader03

2020-07-18 14:08:21 +02:00
parent 239969feb1
commit 1683154676
8 changed files with 214 additions and 3 deletions
--- a/openrndr-demos/src/demo/kotlin/DemoTessShader03.kt
+++ b/openrndr-demos/src/demo/kotlin/DemoTessShader03.kt
@@ -0,0 +1,57 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.DrawPrimitive
+import org.openrndr.draw.Shader
+import org.openrndr.draw.vertexBuffer
+import org.openrndr.draw.vertexFormat
+import org.openrndr.resourceUrl
+import org.openrndr.shape.Ellipse
+
+fun main() {
+    application {
+        program {
+
+            val ellipse = Ellipse(width/2.0, height/2.0, 100.0, 200.0).contour
+
+            val vb = vertexBuffer(vertexFormat {
+                position(3)
+            }, ellipse.segments.size * 4)
+
+            val shader = Shader.createFromUrls(
+                    vsUrl = resourceUrl("/shaders/ts-03.vert"),
+                    tcsUrl = resourceUrl("/shaders/ts-03.tesc"),
+                    tesUrl = resourceUrl("/shaders/ts-03.tese"),
+                    gsUrl = resourceUrl("/shaders/ts-03.geom"),
+                    fsUrl = resourceUrl("/shaders/ts-03.frag")
+            )
+
+            vb.put {
+                for (segment in ellipse.segments) {
+                    val cubic = segment.cubic
+                    write(cubic.start.xy0)
+                    write(cubic.control[0].xy0)
+                    write(cubic.control[1].xy0)
+                    write(cubic.end.xy0)
+                }
+            }
+
+            extend {
+                drawer.clear(ColorRGBa.PINK)
+
+                drawer.translate(width/2.0, height/2.0, 0.0)
+                drawer.rotate(seconds*45.0)
+                drawer.translate(-width/2.0, -height/2.0, 0.0)
+
+                shader.begin()
+                shader.uniform("offset", mouse.position.xy0)
+                shader.uniform("view", drawer.view)
+                shader.uniform("proj", drawer.projection)
+                shader.uniform("model", drawer.model)
+                shader.uniform("resolution", ((mouse.position.x / width) * 63 + 1).toInt())
+                shader.uniform("weight",((mouse.position.y / height) * 128 + 1) )
+                driver.drawVertexBuffer(shader, listOf(vb), DrawPrimitive.PATCHES, 0, vb.vertexCount)
+                shader.end()
+            }
+        }
+    }
+}