Calculate and show the shadow from a spot light.
Change-Id: Ia558852e8cde5d33866b22875eb501e4c6858819
diff --git a/libs/hwui/ShadowTessellator.cpp b/libs/hwui/ShadowTessellator.cpp
index 49a3d2c..6385ef7 100644
--- a/libs/hwui/ShadowTessellator.cpp
+++ b/libs/hwui/ShadowTessellator.cpp
@@ -21,14 +21,30 @@
#include "AmbientShadow.h"
#include "ShadowTessellator.h"
+#include "SpotShadow.h"
namespace android {
namespace uirenderer {
+template<typename T>
+static inline T max(T a, T b) {
+ return a > b ? a : b;
+}
+
// TODO: Support path as the input of the polygon instead of the rect's width
-// and height.
-void ShadowTessellator::tessellateAmbientShadow(float width, float height,
- const mat4& casterTransform, VertexBuffer& shadowVertexBuffer) {
+// and height. And the z values need to be computed according to the
+// transformation for each vertex.
+/**
+ * Generate the polygon for the caster.
+ *
+ * @param width the width of the caster
+ * @param height the height of the caster
+ * @param casterTransform transformation info of the caster
+ * @param polygon return the caster's polygon
+ *
+ */
+void ShadowTessellator::generateCasterPolygon(float width, float height,
+ const mat4& casterTransform, int vertexCount, Vector3* polygon) {
Vector3 pivot(width / 2, height / 2, 0.0f);
casterTransform.mapPoint3d(pivot);
@@ -39,10 +55,6 @@
pivot.x + width * zScaleFactor, pivot.y + height * zScaleFactor);
// Generate the caster's polygon from the rect.
- // TODO: support arbitrary polygon, and the z value need to be computed
- // according to the transformation for each vertex.
- const int vertexCount = 4;
- Vector3 polygon[vertexCount];
polygon[0].x = blockRect.left;
polygon[0].y = blockRect.top;
polygon[0].z = pivot.z;
@@ -55,19 +67,51 @@
polygon[3].x = blockRect.left;
polygon[3].y = blockRect.bottom;
polygon[3].z = pivot.z;
+}
+
+void ShadowTessellator::tessellateAmbientShadow(float width, float height,
+ const mat4& casterTransform, VertexBuffer& shadowVertexBuffer) {
+
+ const int vertexCount = 4;
+ Vector3 polygon[vertexCount];
+ generateCasterPolygon(width, height, casterTransform, vertexCount, polygon);
// A bunch of parameters to tweak the shadow.
// TODO: Allow some of these changable by debug settings or APIs.
- const int rays = 120;
+ const int rays = 128;
const int layers = 2;
const float strength = 0.5;
- const float heightFactor = 120;
- const float geomFactor = 60;
+ const float heightFactor = 128;
+ const float geomFactor = 64;
AmbientShadow::createAmbientShadow(polygon, vertexCount, rays, layers, strength,
heightFactor, geomFactor, shadowVertexBuffer);
}
+void ShadowTessellator::tessellateSpotShadow(float width, float height,
+ int screenWidth, int screenHeight,
+ const mat4& casterTransform, VertexBuffer& shadowVertexBuffer) {
+ const int vertexCount = 4;
+ Vector3 polygon[vertexCount];
+ generateCasterPolygon(width, height, casterTransform, vertexCount, polygon);
+
+ // A bunch of parameters to tweak the shadow.
+ // TODO: Allow some of these changable by debug settings or APIs.
+ const int rays = 256;
+ const int layers = 2;
+ const float strength = 0.5;
+ int maximal = max(screenWidth, screenHeight);
+ Vector3 lightCenter(screenWidth / 2, 0, maximal);
+#if DEBUG_SHADOW
+ ALOGD("light center %f %f %f", lightCenter.x, lightCenter.y, lightCenter.z);
+#endif
+ const float lightSize = maximal / 8;
+ const int lightVertexCount = 16;
+
+ SpotShadow::createSpotShadow(polygon, vertexCount, lightCenter, lightSize,
+ lightVertexCount, rays, layers, strength, shadowVertexBuffer);
+
+}
}; // namespace uirenderer
}; // namespace android