diff options
| -rw-r--r-- | api/current.txt | 1 | ||||
| -rw-r--r-- | opengl/java/android/opengl/Matrix.java | 39 |
2 files changed, 38 insertions, 2 deletions
diff --git a/api/current.txt b/api/current.txt index 0f5c98a..785eb47 100644 --- a/api/current.txt +++ b/api/current.txt @@ -13171,6 +13171,7 @@ package android.opengl { method public static void multiplyMM(float[], int, float[], int, float[], int); method public static void multiplyMV(float[], int, float[], int, float[], int); method public static void orthoM(float[], int, float, float, float, float, float, float); + method public static void perspectiveM(float[], int, float, float, float, float); method public static void rotateM(float[], int, float[], int, float, float, float, float); method public static void rotateM(float[], int, float, float, float, float); method public static void scaleM(float[], int, float[], int, float, float, float); diff --git a/opengl/java/android/opengl/Matrix.java b/opengl/java/android/opengl/Matrix.java index b9fd4ab..a412a43 100644 --- a/opengl/java/android/opengl/Matrix.java +++ b/opengl/java/android/opengl/Matrix.java @@ -16,8 +16,6 @@ package android.opengl; -import javax.microedition.khronos.opengles.GL10; - /** * Matrix math utilities. These methods operate on OpenGL ES format * matrices and vectors stored in float arrays. @@ -332,6 +330,43 @@ public class Matrix { } /** + * Define a projection matrix in terms of a field of view angle, an + * aspect ratio, and z clip planes + * @param m the float array that holds the perspective matrix + * @param offset the offset into float array m where the perspective + * matrix data is written + * @param fovy field of view in y direction, in degrees + * @param aspect width to height aspect ratio of the viewport + * @param zNear + * @param zFar + */ + public static void perspectiveM(float[] m, int offset, + float fovy, float aspect, float zNear, float zFar) { + float f = 1.0f / (float) Math.tan(fovy * (Math.PI / 360.0)); + float rangeReciprocal = 1.0f / (zNear - zFar); + + m[offset + 0] = f / aspect; + m[offset + 1] = 0.0f; + m[offset + 2] = 0.0f; + m[offset + 3] = 0.0f; + + m[offset + 4] = 0.0f; + m[offset + 5] = f; + m[offset + 6] = 0.0f; + m[offset + 7] = 0.0f; + + m[offset + 8] = 0.0f; + m[offset + 9] = 0.0f; + m[offset + 10] = (zFar + zNear) * rangeReciprocal; + m[offset + 11] = -1.0f; + + m[offset + 12] = 0.0f; + m[offset + 13] = 0.0f; + m[offset + 14] = 2.0f * zFar * rangeReciprocal; + m[offset + 15] = 0.0f; + } + + /** * Computes the length of a vector * * @param x x coordinate of a vector |